diff options
Diffstat (limited to 'drivers/scsi/aic7xxx/aic7xxx_osm.c')
| -rw-r--r-- | drivers/scsi/aic7xxx/aic7xxx_osm.c | 5043 |
1 files changed, 5043 insertions, 0 deletions
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c new file mode 100644 index 000000000000..031c6aaa5ca5 --- /dev/null +++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c @@ -0,0 +1,5043 @@ +/* + * Adaptec AIC7xxx device driver for Linux. + * + * $Id: //depot/aic7xxx/linux/drivers/scsi/aic7xxx/aic7xxx_osm.c#235 $ + * + * Copyright (c) 1994 John Aycock + * The University of Calgary Department of Computer Science. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Sources include the Adaptec 1740 driver (aha1740.c), the Ultrastor 24F + * driver (ultrastor.c), various Linux kernel source, the Adaptec EISA + * config file (!adp7771.cfg), the Adaptec AHA-2740A Series User's Guide, + * the Linux Kernel Hacker's Guide, Writing a SCSI Device Driver for Linux, + * the Adaptec 1542 driver (aha1542.c), the Adaptec EISA overlay file + * (adp7770.ovl), the Adaptec AHA-2740 Series Technical Reference Manual, + * the Adaptec AIC-7770 Data Book, the ANSI SCSI specification, the + * ANSI SCSI-2 specification (draft 10c), ... + * + * -------------------------------------------------------------------------- + * + * Modifications by Daniel M. Eischen (deischen@iworks.InterWorks.org): + * + * Substantially modified to include support for wide and twin bus + * adapters, DMAing of SCBs, tagged queueing, IRQ sharing, bug fixes, + * SCB paging, and other rework of the code. + * + * -------------------------------------------------------------------------- + * Copyright (c) 1994-2000 Justin T. Gibbs. + * Copyright (c) 2000-2001 Adaptec Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + * + *--------------------------------------------------------------------------- + * + * Thanks also go to (in alphabetical order) the following: + * + * Rory Bolt - Sequencer bug fixes + * Jay Estabrook - Initial DEC Alpha support + * Doug Ledford - Much needed abort/reset bug fixes + * Kai Makisara - DMAing of SCBs + * + * A Boot time option was also added for not resetting the scsi bus. + * + * Form: aic7xxx=extended + * aic7xxx=no_reset + * aic7xxx=verbose + * + * Daniel M. Eischen, deischen@iworks.InterWorks.org, 1/23/97 + * + * Id: aic7xxx.c,v 4.1 1997/06/12 08:23:42 deang Exp + */ + +/* + * Further driver modifications made by Doug Ledford <dledford@redhat.com> + * + * Copyright (c) 1997-1999 Doug Ledford + * + * These changes are released under the same licensing terms as the FreeBSD + * driver written by Justin Gibbs. Please see his Copyright notice above + * for the exact terms and conditions covering my changes as well as the + * warranty statement. + * + * Modifications made to the aic7xxx.c,v 4.1 driver from Dan Eischen include + * but are not limited to: + * + * 1: Import of the latest FreeBSD sequencer code for this driver + * 2: Modification of kernel code to accommodate different sequencer semantics + * 3: Extensive changes throughout kernel portion of driver to improve + * abort/reset processing and error hanndling + * 4: Other work contributed by various people on the Internet + * 5: Changes to printk information and verbosity selection code + * 6: General reliability related changes, especially in IRQ management + * 7: Modifications to the default probe/attach order for supported cards + * 8: SMP friendliness has been improved + * + */ + +#include "aic7xxx_osm.h" +#include "aic7xxx_inline.h" +#include <scsi/scsicam.h> + +/* + * Include aiclib.c as part of our + * "module dependencies are hard" work around. + */ +#include "aiclib.c" + +#include <linux/init.h> /* __setup */ + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) +#include "sd.h" /* For geometry detection */ +#endif + +#include <linux/mm.h> /* For fetching system memory size */ +#include <linux/blkdev.h> /* For block_size() */ +#include <linux/delay.h> /* For ssleep/msleep */ + +/* + * Lock protecting manipulation of the ahc softc list. + */ +spinlock_t ahc_list_spinlock; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) +/* For dynamic sglist size calculation. */ +u_int ahc_linux_nseg; +#endif + +/* + * Set this to the delay in seconds after SCSI bus reset. + * Note, we honor this only for the initial bus reset. + * The scsi error recovery code performs its own bus settle + * delay handling for error recovery actions. + */ +#ifdef CONFIG_AIC7XXX_RESET_DELAY_MS +#define AIC7XXX_RESET_DELAY CONFIG_AIC7XXX_RESET_DELAY_MS +#else +#define AIC7XXX_RESET_DELAY 5000 +#endif + +/* + * Control collection of SCSI transfer statistics for the /proc filesystem. + * + * NOTE: Do NOT enable this when running on kernels version 1.2.x and below. + * NOTE: This does affect performance since it has to maintain statistics. + */ +#ifdef CONFIG_AIC7XXX_PROC_STATS +#define AIC7XXX_PROC_STATS +#endif + +/* + * To change the default number of tagged transactions allowed per-device, + * add a line to the lilo.conf file like: + * append="aic7xxx=verbose,tag_info:{{32,32,32,32},{32,32,32,32}}" + * which will result in the first four devices on the first two + * controllers being set to a tagged queue depth of 32. + * + * The tag_commands is an array of 16 to allow for wide and twin adapters. + * Twin adapters will use indexes 0-7 for channel 0, and indexes 8-15 + * for channel 1. + */ +typedef struct { + uint8_t tag_commands[16]; /* Allow for wide/twin adapters. */ +} adapter_tag_info_t; + +/* + * Modify this as you see fit for your system. + * + * 0 tagged queuing disabled + * 1 <= n <= 253 n == max tags ever dispatched. + * + * The driver will throttle the number of commands dispatched to a + * device if it returns queue full. For devices with a fixed maximum + * queue depth, the driver will eventually determine this depth and + * lock it in (a console message is printed to indicate that a lock + * has occurred). On some devices, queue full is returned for a temporary + * resource shortage. These devices will return queue full at varying + * depths. The driver will throttle back when the queue fulls occur and + * attempt to slowly increase the depth over time as the device recovers + * from the resource shortage. + * + * In this example, the first line will disable tagged queueing for all + * the devices on the first probed aic7xxx adapter. + * + * The second line enables tagged queueing with 4 commands/LUN for IDs + * (0, 2-11, 13-15), disables tagged queueing for ID 12, and tells the + * driver to attempt to use up to 64 tags for ID 1. + * + * The third line is the same as the first line. + * + * The fourth line disables tagged queueing for devices 0 and 3. It + * enables tagged queueing for the other IDs, with 16 commands/LUN + * for IDs 1 and 4, 127 commands/LUN for ID 8, and 4 commands/LUN for + * IDs 2, 5-7, and 9-15. + */ + +/* + * NOTE: The below structure is for reference only, the actual structure + * to modify in order to change things is just below this comment block. +adapter_tag_info_t aic7xxx_tag_info[] = +{ + {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, + {{4, 64, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 0, 4, 4, 4}}, + {{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, + {{0, 16, 4, 0, 16, 4, 4, 4, 127, 4, 4, 4, 4, 4, 4, 4}} +}; +*/ + +#ifdef CONFIG_AIC7XXX_CMDS_PER_DEVICE +#define AIC7XXX_CMDS_PER_DEVICE CONFIG_AIC7XXX_CMDS_PER_DEVICE +#else +#define AIC7XXX_CMDS_PER_DEVICE AHC_MAX_QUEUE +#endif + +#define AIC7XXX_CONFIGED_TAG_COMMANDS { \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE, \ + AIC7XXX_CMDS_PER_DEVICE, AIC7XXX_CMDS_PER_DEVICE \ +} + +/* + * By default, use the number of commands specified by + * the users kernel configuration. + */ +static adapter_tag_info_t aic7xxx_tag_info[] = +{ + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS}, + {AIC7XXX_CONFIGED_TAG_COMMANDS} +}; + +/* + * DV option: + * + * positive value = DV Enabled + * zero = DV Disabled + * negative value = DV Default for adapter type/seeprom + */ +#ifdef CONFIG_AIC7XXX_DV_SETTING +#define AIC7XXX_CONFIGED_DV CONFIG_AIC7XXX_DV_SETTING +#else +#define AIC7XXX_CONFIGED_DV -1 +#endif + +static int8_t aic7xxx_dv_settings[] = +{ + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV, + AIC7XXX_CONFIGED_DV +}; + +/* + * There should be a specific return value for this in scsi.h, but + * it seems that most drivers ignore it. + */ +#define DID_UNDERFLOW DID_ERROR + +void +ahc_print_path(struct ahc_softc *ahc, struct scb *scb) +{ + printk("(scsi%d:%c:%d:%d): ", + ahc->platform_data->host->host_no, + scb != NULL ? SCB_GET_CHANNEL(ahc, scb) : 'X', + scb != NULL ? SCB_GET_TARGET(ahc, scb) : -1, + scb != NULL ? SCB_GET_LUN(scb) : -1); +} + +/* + * XXX - these options apply unilaterally to _all_ 274x/284x/294x + * cards in the system. This should be fixed. Exceptions to this + * rule are noted in the comments. + */ + +/* + * Skip the scsi bus reset. Non 0 make us skip the reset at startup. This + * has no effect on any later resets that might occur due to things like + * SCSI bus timeouts. + */ +static uint32_t aic7xxx_no_reset; + +/* + * Certain PCI motherboards will scan PCI devices from highest to lowest, + * others scan from lowest to highest, and they tend to do all kinds of + * strange things when they come into contact with PCI bridge chips. The + * net result of all this is that the PCI card that is actually used to boot + * the machine is very hard to detect. Most motherboards go from lowest + * PCI slot number to highest, and the first SCSI controller found is the + * one you boot from. The only exceptions to this are when a controller + * has its BIOS disabled. So, we by default sort all of our SCSI controllers + * from lowest PCI slot number to highest PCI slot number. We also force + * all controllers with their BIOS disabled to the end of the list. This + * works on *almost* all computers. Where it doesn't work, we have this + * option. Setting this option to non-0 will reverse the order of the sort + * to highest first, then lowest, but will still leave cards with their BIOS + * disabled at the very end. That should fix everyone up unless there are + * really strange cirumstances. + */ +static uint32_t aic7xxx_reverse_scan; + +/* + * Should we force EXTENDED translation on a controller. + * 0 == Use whatever is in the SEEPROM or default to off + * 1 == Use whatever is in the SEEPROM or default to on + */ +static uint32_t aic7xxx_extended; + +/* + * PCI bus parity checking of the Adaptec controllers. This is somewhat + * dubious at best. To my knowledge, this option has never actually + * solved a PCI parity problem, but on certain machines with broken PCI + * chipset configurations where stray PCI transactions with bad parity are + * the norm rather than the exception, the error messages can be overwelming. + * It's included in the driver for completeness. + * 0 = Shut off PCI parity check + * non-0 = reverse polarity pci parity checking + */ +static uint32_t aic7xxx_pci_parity = ~0; + +/* + * Certain newer motherboards have put new PCI based devices into the + * IO spaces that used to typically be occupied by VLB or EISA cards. + * This overlap can cause these newer motherboards to lock up when scanned + * for older EISA and VLB devices. Setting this option to non-0 will + * cause the driver to skip scanning for any VLB or EISA controllers and + * only support the PCI controllers. NOTE: this means that if the kernel + * os compiled with PCI support disabled, then setting this to non-0 + * would result in never finding any devices :) + */ +#ifndef CONFIG_AIC7XXX_PROBE_EISA_VL +uint32_t aic7xxx_probe_eisa_vl; +#else +uint32_t aic7xxx_probe_eisa_vl = ~0; +#endif + +/* + * There are lots of broken chipsets in the world. Some of them will + * violate the PCI spec when we issue byte sized memory writes to our + * controller. I/O mapped register access, if allowed by the given + * platform, will work in almost all cases. + */ +uint32_t aic7xxx_allow_memio = ~0; + +/* + * aic7xxx_detect() has been run, so register all device arrivals + * immediately with the system rather than deferring to the sorted + * attachment performed by aic7xxx_detect(). + */ +int aic7xxx_detect_complete; + +/* + * So that we can set how long each device is given as a selection timeout. + * The table of values goes like this: + * 0 - 256ms + * 1 - 128ms + * 2 - 64ms + * 3 - 32ms + * We default to 256ms because some older devices need a longer time + * to respond to initial selection. + */ +static uint32_t aic7xxx_seltime; + +/* + * Certain devices do not perform any aging on commands. Should the + * device be saturated by commands in one portion of the disk, it is + * possible for transactions on far away sectors to never be serviced. + * To handle these devices, we can periodically send an ordered tag to + * force all outstanding transactions to be serviced prior to a new + * transaction. + */ +uint32_t aic7xxx_periodic_otag; + +/* + * Module information and settable options. + */ +static char *aic7xxx = NULL; + +MODULE_AUTHOR("Maintainer: Justin T. Gibbs <gibbs@scsiguy.com>"); +MODULE_DESCRIPTION("Adaptec Aic77XX/78XX SCSI Host Bus Adapter driver"); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(AIC7XXX_DRIVER_VERSION); +module_param(aic7xxx, charp, 0444); +MODULE_PARM_DESC(aic7xxx, +"period delimited, options string.\n" +" verbose Enable verbose/diagnostic logging\n" +" allow_memio Allow device registers to be memory mapped\n" +" debug Bitmask of debug values to enable\n" +" no_probe Toggle EISA/VLB controller probing\n" +" probe_eisa_vl Toggle EISA/VLB controller probing\n" +" no_reset Supress initial bus resets\n" +" extended Enable extended geometry on all controllers\n" +" periodic_otag Send an ordered tagged transaction\n" +" periodically to prevent tag starvation.\n" +" This may be required by some older disk\n" +" drives or RAID arrays.\n" +" reverse_scan Sort PCI devices highest Bus/Slot to lowest\n" +" tag_info:<tag_str> Set per-target tag depth\n" +" global_tag_depth:<int> Global tag depth for every target\n" +" on every bus\n" +" dv:<dv_settings> Set per-controller Domain Validation Setting.\n" +" seltime:<int> Selection Timeout\n" +" (0/256ms,1/128ms,2/64ms,3/32ms)\n" +"\n" +" Sample /etc/modprobe.conf line:\n" +" Toggle EISA/VLB probing\n" +" Set tag depth on Controller 1/Target 1 to 10 tags\n" +" Shorten the selection timeout to 128ms\n" +"\n" +" options aic7xxx 'aic7xxx=probe_eisa_vl.tag_info:{{}.{.10}}.seltime:1'\n" +); + +static void ahc_linux_handle_scsi_status(struct ahc_softc *, + struct ahc_linux_device *, + struct scb *); +static void ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, + Scsi_Cmnd *cmd); +static void ahc_linux_filter_inquiry(struct ahc_softc*, struct ahc_devinfo*); +static void ahc_linux_sem_timeout(u_long arg); +static void ahc_linux_freeze_simq(struct ahc_softc *ahc); +static void ahc_linux_release_simq(u_long arg); +static void ahc_linux_dev_timed_unfreeze(u_long arg); +static int ahc_linux_queue_recovery_cmd(Scsi_Cmnd *cmd, scb_flag flag); +static void ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc); +static void ahc_linux_size_nseg(void); +static void ahc_linux_thread_run_complete_queue(struct ahc_softc *ahc); +static void ahc_linux_start_dv(struct ahc_softc *ahc); +static void ahc_linux_dv_timeout(struct scsi_cmnd *cmd); +static int ahc_linux_dv_thread(void *data); +static void ahc_linux_kill_dv_thread(struct ahc_softc *ahc); +static void ahc_linux_dv_target(struct ahc_softc *ahc, u_int target); +static void ahc_linux_dv_transition(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_fill_cmd(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo); +static void ahc_linux_dv_inq(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ, + u_int request_length); +static void ahc_linux_dv_tur(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo); +static void ahc_linux_dv_rebd(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_web(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_reb(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static void ahc_linux_dv_su(struct ahc_softc *ahc, + struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ); +static int ahc_linux_fallback(struct ahc_softc *ahc, + struct ahc_devinfo *devinfo); +static void ahc_linux_dv_complete(Scsi_Cmnd *cmd); +static void ahc_linux_generate_dv_pattern(struct ahc_linux_target *targ); +static u_int ahc_linux_user_tagdepth(struct ahc_softc *ahc, + struct ahc_devinfo *devinfo); +static u_int ahc_linux_user_dv_setting(struct ahc_softc *ahc); +static void ahc_linux_device_queue_depth(struct ahc_softc *ahc, + struct ahc_linux_device *dev); +static struct ahc_linux_target* ahc_linux_alloc_target(struct ahc_softc*, + u_int, u_int); +static void ahc_linux_free_target(struct ahc_softc*, + struct ahc_linux_target*); +static struct ahc_linux_device* ahc_linux_alloc_device(struct ahc_softc*, + struct ahc_linux_target*, + u_int); +static void ahc_linux_free_device(struct ahc_softc*, + struct ahc_linux_device*); +static void ahc_linux_run_device_queue(struct ahc_softc*, + struct ahc_linux_device*); +static void ahc_linux_setup_tag_info_global(char *p); +static aic_option_callback_t ahc_linux_setup_tag_info; +static aic_option_callback_t ahc_linux_setup_dv; +static int aic7xxx_setup(char *s); +static int ahc_linux_next_unit(void); +static void ahc_runq_tasklet(unsigned long data); +static struct ahc_cmd *ahc_linux_run_complete_queue(struct ahc_softc *ahc); + +/********************************* Inlines ************************************/ +static __inline void ahc_schedule_runq(struct ahc_softc *ahc); +static __inline struct ahc_linux_device* + ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, + u_int target, u_int lun, int alloc); +static __inline void ahc_schedule_completeq(struct ahc_softc *ahc); +static __inline void ahc_linux_check_device_queue(struct ahc_softc *ahc, + struct ahc_linux_device *dev); +static __inline struct ahc_linux_device * + ahc_linux_next_device_to_run(struct ahc_softc *ahc); +static __inline void ahc_linux_run_device_queues(struct ahc_softc *ahc); +static __inline void ahc_linux_unmap_scb(struct ahc_softc*, struct scb*); + +static __inline int ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb, + struct ahc_dma_seg *sg, + dma_addr_t addr, bus_size_t len); + +static __inline void +ahc_schedule_completeq(struct ahc_softc *ahc) +{ + if ((ahc->platform_data->flags & AHC_RUN_CMPLT_Q_TIMER) == 0) { + ahc->platform_data->flags |= AHC_RUN_CMPLT_Q_TIMER; + ahc->platform_data->completeq_timer.expires = jiffies; + add_timer(&ahc->platform_data->completeq_timer); + } +} + +/* + * Must be called with our lock held. + */ +static __inline void +ahc_schedule_runq(struct ahc_softc *ahc) +{ + tasklet_schedule(&ahc->platform_data->runq_tasklet); +} + +static __inline struct ahc_linux_device* +ahc_linux_get_device(struct ahc_softc *ahc, u_int channel, u_int target, + u_int lun, int alloc) +{ + struct ahc_linux_target *targ; + struct ahc_linux_device *dev; + u_int target_offset; + + target_offset = target; + if (channel != 0) + target_offset += 8; + targ = ahc->platform_data->targets[target_offset]; + if (targ == NULL) { + if (alloc != 0) { + targ = ahc_linux_alloc_target(ahc, channel, target); + if (targ == NULL) + return (NULL); + } else + return (NULL); + } + dev = targ->devices[lun]; + if (dev == NULL && alloc != 0) + dev = ahc_linux_alloc_device(ahc, targ, lun); + return (dev); +} + +#define AHC_LINUX_MAX_RETURNED_ERRORS 4 +static struct ahc_cmd * +ahc_linux_run_complete_queue(struct ahc_softc *ahc) +{ + struct ahc_cmd *acmd; + u_long done_flags; + int with_errors; + + with_errors = 0; + ahc_done_lock(ahc, &done_flags); + while ((acmd = TAILQ_FIRST(&ahc->platform_data->completeq)) != NULL) { + Scsi_Cmnd *cmd; + + if (with_errors > AHC_LINUX_MAX_RETURNED_ERRORS) { + /* + * Linux uses stack recursion to requeue + * commands that need to be retried. Avoid + * blowing out the stack by "spoon feeding" + * commands that completed with error back + * the operating system in case they are going + * to be retried. "ick" + */ + ahc_schedule_completeq(ahc); + break; + } + TAILQ_REMOVE(&ahc->platform_data->completeq, + acmd, acmd_links.tqe); + cmd = &acmd_scsi_cmd(acmd); + cmd->host_scribble = NULL; + if (ahc_cmd_get_transaction_status(cmd) != DID_OK + || (cmd->result & 0xFF) != SCSI_STATUS_OK) + with_errors++; + + cmd->scsi_done(cmd); + } + ahc_done_unlock(ahc, &done_flags); + return (acmd); +} + +static __inline void +ahc_linux_check_device_queue(struct ahc_softc *ahc, + struct ahc_linux_device *dev) +{ + if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) != 0 + && dev->active == 0) { + dev->flags &= ~AHC_DEV_FREEZE_TIL_EMPTY; + dev->qfrozen--; + } + + if (TAILQ_FIRST(&dev->busyq) == NULL + || dev->openings == 0 || dev->qfrozen != 0) + return; + + ahc_linux_run_device_queue(ahc, dev); +} + +static __inline struct ahc_linux_device * +ahc_linux_next_device_to_run(struct ahc_softc *ahc) +{ + + if ((ahc->flags & AHC_RESOURCE_SHORTAGE) != 0 + || (ahc->platform_data->qfrozen != 0 + && AHC_DV_SIMQ_FROZEN(ahc) == 0)) + return (NULL); + return (TAILQ_FIRST(&ahc->platform_data->device_runq)); +} + +static __inline void +ahc_linux_run_device_queues(struct ahc_softc *ahc) +{ + struct ahc_linux_device *dev; + + while ((dev = ahc_linux_next_device_to_run(ahc)) != NULL) { + TAILQ_REMOVE(&ahc->platform_data->device_runq, dev, links); + dev->flags &= ~AHC_DEV_ON_RUN_LIST; + ahc_linux_check_device_queue(ahc, dev); + } +} + +static __inline void +ahc_linux_unmap_scb(struct ahc_softc *ahc, struct scb *scb) +{ + Scsi_Cmnd *cmd; + + cmd = scb->io_ctx; + ahc_sync_sglist(ahc, scb, BUS_DMASYNC_POSTWRITE); + if (cmd->use_sg != 0) { + struct scatterlist *sg; + + sg = (struct scatterlist *)cmd->request_buffer; + pci_unmap_sg(ahc->dev_softc, sg, cmd->use_sg, + scsi_to_pci_dma_dir(cmd->sc_data_direction)); + } else if (cmd->request_bufflen != 0) { + pci_unmap_single(ahc->dev_softc, + scb->platform_data->buf_busaddr, + cmd->request_bufflen, + scsi_to_pci_dma_dir(cmd->sc_data_direction)); + } +} + +static __inline int +ahc_linux_map_seg(struct ahc_softc *ahc, struct scb *scb, + struct ahc_dma_seg *sg, dma_addr_t addr, bus_size_t len) +{ + int consumed; + + if ((scb->sg_count + 1) > AHC_NSEG) + panic("Too few segs for dma mapping. " + "Increase AHC_NSEG\n"); + + consumed = 1; + sg->addr = ahc_htole32(addr & 0xFFFFFFFF); + scb->platform_data->xfer_len += len; + + if (sizeof(dma_addr_t) > 4 + && (ahc->flags & AHC_39BIT_ADDRESSING) != 0) + len |= (addr >> 8) & AHC_SG_HIGH_ADDR_MASK; + + sg->len = ahc_htole32(len); + return (consumed); +} + +/************************ Host template entry points *************************/ +static int ahc_linux_detect(Scsi_Host_Template *); +static int ahc_linux_queue(Scsi_Cmnd *, void (*)(Scsi_Cmnd *)); +static const char *ahc_linux_info(struct Scsi_Host *); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) +static int ahc_linux_slave_alloc(Scsi_Device *); +static int ahc_linux_slave_configure(Scsi_Device *); +static void ahc_linux_slave_destroy(Scsi_Device *); +#if defined(__i386__) +static int ahc_linux_biosparam(struct scsi_device*, + struct block_device*, + sector_t, int[]); +#endif +#else +static int ahc_linux_release(struct Scsi_Host *); +static void ahc_linux_select_queue_depth(struct Scsi_Host *host, + Scsi_Device *scsi_devs); +#if defined(__i386__) +static int ahc_linux_biosparam(Disk *, kdev_t, int[]); +#endif +#endif +static int ahc_linux_bus_reset(Scsi_Cmnd *); +static int ahc_linux_dev_reset(Scsi_Cmnd *); +static int ahc_linux_abort(Scsi_Cmnd *); + +/* + * Calculate a safe value for AHC_NSEG (as expressed through ahc_linux_nseg). + * + * In pre-2.5.X... + * The midlayer allocates an S/G array dynamically when a command is issued + * using SCSI malloc. This array, which is in an OS dependent format that + * must later be copied to our private S/G list, is sized to house just the + * number of segments needed for the current transfer. Since the code that + * sizes the SCSI malloc pool does not take into consideration fragmentation + * of the pool, executing transactions numbering just a fraction of our + * concurrent transaction limit with list lengths aproaching AHC_NSEG will + * quickly depleat the SCSI malloc pool of usable space. Unfortunately, the + * mid-layer does not properly handle this scsi malloc failures for the S/G + * array and the result can be a lockup of the I/O subsystem. We try to size + * our S/G list so that it satisfies our drivers allocation requirements in + * addition to avoiding fragmentation of the SCSI malloc pool. + */ +static void +ahc_linux_size_nseg(void) +{ +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + u_int cur_size; + u_int best_size; + + /* + * The SCSI allocator rounds to the nearest 512 bytes + * an cannot allocate across a page boundary. Our algorithm + * is to start at 1K of scsi malloc space per-command and + * loop through all factors of the PAGE_SIZE and pick the best. + */ + best_size = 0; + for (cur_size = 1024; cur_size <= PAGE_SIZE; cur_size *= 2) { + u_int nseg; + + nseg = cur_size / sizeof(struct scatterlist); + if (nseg < AHC_LINUX_MIN_NSEG) + continue; + + if (best_size == 0) { + best_size = cur_size; + ahc_linux_nseg = nseg; + } else { + u_int best_rem; + u_int cur_rem; + + /* + * Compare the traits of the current "best_size" + * with the current size to determine if the + * current size is a better size. + */ + best_rem = best_size % sizeof(struct scatterlist); + cur_rem = cur_size % sizeof(struct scatterlist); + if (cur_rem < best_rem) { + best_size = cur_size; + ahc_linux_nseg = nseg; + } + } + } +#endif +} + +/* + * Try to detect an Adaptec 7XXX controller. + */ +static int +ahc_linux_detect(Scsi_Host_Template *template) +{ + struct ahc_softc *ahc; + int found = 0; + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + /* + * It is a bug that the upper layer takes + * this lock just prior to calling us. + */ + spin_unlock_irq(&io_request_lock); +#endif + + /* + * Sanity checking of Linux SCSI data structures so + * that some of our hacks^H^H^H^H^Hassumptions aren't + * violated. + */ + if (offsetof(struct ahc_cmd_internal, end) + > offsetof(struct scsi_cmnd, host_scribble)) { + printf("ahc_linux_detect: SCSI data structures changed.\n"); + printf("ahc_linux_detect: Unable to attach\n"); + return (0); + } + ahc_linux_size_nseg(); + /* + * If we've been passed any parameters, process them now. + */ + if (aic7xxx) + aic7xxx_setup(aic7xxx); + + template->proc_name = "aic7xxx"; + + /* + * Initialize our softc list lock prior to + * probing for any adapters. + */ + ahc_list_lockinit(); + + found = ahc_linux_pci_init(); + if (!ahc_linux_eisa_init()) + found++; + + /* + * Register with the SCSI layer all + * controllers we've found. + */ + TAILQ_FOREACH(ahc, &ahc_tailq, links) { + + if (ahc_linux_register_host(ahc, template) == 0) + found++; + } + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + spin_lock_irq(&io_request_lock); +#endif + aic7xxx_detect_complete++; + + return (found); +} + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) +/* + * Free the passed in Scsi_Host memory structures prior to unloading the + * module. + */ +int +ahc_linux_release(struct Scsi_Host * host) +{ + struct ahc_softc *ahc; + u_long l; + + ahc_list_lock(&l); + if (host != NULL) { + + /* + * We should be able to just perform + * the free directly, but check our + * list for extra sanity. + */ + ahc = ahc_find_softc(*(struct ahc_softc **)host->hostdata); + if (ahc != NULL) { + u_long s; + + ahc_lock(ahc, &s); + ahc_intr_enable(ahc, FALSE); + ahc_unlock(ahc, &s); + ahc_free(ahc); + } + } + ahc_list_unlock(&l); + return (0); +} +#endif + +/* + * Return a string describing the driver. + */ +static const char * +ahc_linux_info(struct Scsi_Host *host) +{ + static char buffer[512]; + char ahc_info[256]; + char *bp; + struct ahc_softc *ahc; + + bp = &buffer[0]; + ahc = *(struct ahc_softc **)host->hostdata; + memset(bp, 0, sizeof(buffer)); + strcpy(bp, "Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev "); + strcat(bp, AIC7XXX_DRIVER_VERSION); + strcat(bp, "\n"); + strcat(bp, " <"); + strcat(bp, ahc->description); + strcat(bp, ">\n"); + strcat(bp, " "); + ahc_controller_info(ahc, ahc_info); + strcat(bp, ahc_info); + strcat(bp, "\n"); + + return (bp); +} + +/* + * Queue an SCB to the controller. + */ +static int +ahc_linux_queue(Scsi_Cmnd * cmd, void (*scsi_done) (Scsi_Cmnd *)) +{ + struct ahc_softc *ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = *(struct ahc_softc **)cmd->device->host->hostdata; + + /* + * Save the callback on completion function. + */ + cmd->scsi_done = scsi_done; + + ahc_midlayer_entrypoint_lock(ahc, &flags); + + /* + * Close the race of a command that was in the process of + * being queued to us just as our simq was frozen. Let + * DV commands through so long as we are only frozen to + * perform DV. + */ + if (ahc->platform_data->qfrozen != 0 + && AHC_DV_CMD(cmd) == 0) { + + ahc_cmd_set_transaction_status(cmd, CAM_REQUEUE_REQ); + ahc_linux_queue_cmd_complete(ahc, cmd); + ahc_schedule_completeq(ahc); + ahc_midlayer_entrypoint_unlock(ahc, &flags); + return (0); + } + dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id, + cmd->device->lun, /*alloc*/TRUE); + if (dev == NULL) { + ahc_cmd_set_transaction_status(cmd, CAM_RESRC_UNAVAIL); + ahc_linux_queue_cmd_complete(ahc, cmd); + ahc_schedule_completeq(ahc); + ahc_midlayer_entrypoint_unlock(ahc, &flags); + printf("%s: aic7xxx_linux_queue - Unable to allocate device!\n", + ahc_name(ahc)); + return (0); + } + cmd->result = CAM_REQ_INPROG << 16; + TAILQ_INSERT_TAIL(&dev->busyq, (struct ahc_cmd *)cmd, acmd_links.tqe); + if ((dev->flags & AHC_DEV_ON_RUN_LIST) == 0) { + TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, dev, links); + dev->flags |= AHC_DEV_ON_RUN_LIST; + ahc_linux_run_device_queues(ahc); + } + ahc_midlayer_entrypoint_unlock(ahc, &flags); + return (0); +} + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) +static int +ahc_linux_slave_alloc(Scsi_Device *device) +{ + struct ahc_softc *ahc; + + ahc = *((struct ahc_softc **)device->host->hostdata); + if (bootverbose) + printf("%s: Slave Alloc %d\n", ahc_name(ahc), device->id); + return (0); +} + +static int +ahc_linux_slave_configure(Scsi_Device *device) +{ + struct ahc_softc *ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = *((struct ahc_softc **)device->host->hostdata); + if (bootverbose) + printf("%s: Slave Configure %d\n", ahc_name(ahc), device->id); + ahc_midlayer_entrypoint_lock(ahc, &flags); + /* + * Since Linux has attached to the device, configure + * it so we don't free and allocate the device + * structure on every command. + */ + dev = ahc_linux_get_device(ahc, device->channel, + device->id, device->lun, + /*alloc*/TRUE); + if (dev != NULL) { + dev->flags &= ~AHC_DEV_UNCONFIGURED; + dev->scsi_device = device; + ahc_linux_device_queue_depth(ahc, dev); + } + ahc_midlayer_entrypoint_unlock(ahc, &flags); + return (0); +} + +static void +ahc_linux_slave_destroy(Scsi_Device *device) +{ + struct ahc_softc *ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = *((struct ahc_softc **)device->host->hostdata); + if (bootverbose) + printf("%s: Slave Destroy %d\n", ahc_name(ahc), device->id); + ahc_midlayer_entrypoint_lock(ahc, &flags); + dev = ahc_linux_get_device(ahc, device->channel, + device->id, device->lun, + /*alloc*/FALSE); + /* + * Filter out "silly" deletions of real devices by only + * deleting devices that have had slave_configure() + * called on them. All other devices that have not + * been configured will automatically be deleted by + * the refcounting process. + */ + if (dev != NULL + && (dev->flags & AHC_DEV_SLAVE_CONFIGURED) != 0) { + dev->flags |= AHC_DEV_UNCONFIGURED; + if (TAILQ_EMPTY(&dev->busyq) + && dev->active == 0 + && (dev->flags & AHC_DEV_TIMER_ACTIVE) == 0) + ahc_linux_free_device(ahc, dev); + } + ahc_midlayer_entrypoint_unlock(ahc, &flags); +} +#else +/* + * Sets the queue depth for each SCSI device hanging + * off the input host adapter. + */ +static void +ahc_linux_select_queue_depth(struct Scsi_Host *host, Scsi_Device *scsi_devs) +{ + Scsi_Device *device; + Scsi_Device *ldev; + struct ahc_softc *ahc; + u_long flags; + + ahc = *((struct ahc_softc **)host->hostdata); + ahc_lock(ahc, &flags); + for (device = scsi_devs; device != NULL; device = device->next) { + + /* + * Watch out for duplicate devices. This works around + * some quirks in how the SCSI scanning code does its + * device management. + */ + for (ldev = scsi_devs; ldev != device; ldev = ldev->next) { + if (ldev->host == device->host + && ldev->channel == device->channel + && ldev->id == device->id + && ldev->lun == device->lun) + break; + } + /* Skip duplicate. */ + if (ldev != device) + continue; + + if (device->host == host) { + struct ahc_linux_device *dev; + + /* + * Since Linux has attached to the device, configure + * it so we don't free and allocate the device + * structure on every command. + */ + dev = ahc_linux_get_device(ahc, device->channel, + device->id, device->lun, + /*alloc*/TRUE); + if (dev != NULL) { + dev->flags &= ~AHC_DEV_UNCONFIGURED; + dev->scsi_device = device; + ahc_linux_device_queue_depth(ahc, dev); + device->queue_depth = dev->openings + + dev->active; + if ((dev->flags & (AHC_DEV_Q_BASIC + | AHC_DEV_Q_TAGGED)) == 0) { + /* + * We allow the OS to queue 2 untagged + * transactions to us at any time even + * though we can only execute them + * serially on the controller/device. + * This should remove some latency. + */ + device->queue_depth = 2; + } + } + } + } + ahc_unlock(ahc, &flags); +} +#endif + +#if defined(__i386__) +/* + * Return the disk geometry for the given SCSI device. + */ +static int +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) +ahc_linux_biosparam(struct scsi_device *sdev, struct block_device *bdev, + sector_t capacity, int geom[]) +{ + uint8_t *bh; +#else +ahc_linux_biosparam(Disk *disk, kdev_t dev, int geom[]) +{ + struct scsi_device *sdev = disk->device; + u_long capacity = disk->capacity; + struct buffer_head *bh; +#endif + int heads; + int sectors; + int cylinders; + int ret; + int extended; + struct ahc_softc *ahc; + u_int channel; + + ahc = *((struct ahc_softc **)sdev->host->hostdata); + channel = sdev->channel; + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + bh = scsi_bios_ptable(bdev); +#elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,17) + bh = bread(MKDEV(MAJOR(dev), MINOR(dev) & ~0xf), 0, block_size(dev)); +#else + bh = bread(MKDEV(MAJOR(dev), MINOR(dev) & ~0xf), 0, 1024); +#endif + + if (bh) { + ret = scsi_partsize(bh, capacity, + &geom[2], &geom[0], &geom[1]); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + kfree(bh); +#else + brelse(bh); +#endif + if (ret != -1) + return (ret); + } + heads = 64; + sectors = 32; + cylinders = aic_sector_div(capacity, heads, sectors); + + if (aic7xxx_extended != 0) + extended = 1; + else if (channel == 0) + extended = (ahc->flags & AHC_EXTENDED_TRANS_A) != 0; + else + extended = (ahc->flags & AHC_EXTENDED_TRANS_B) != 0; + if (extended && cylinders >= 1024) { + heads = 255; + sectors = 63; + cylinders = aic_sector_div(capacity, heads, sectors); + } + geom[0] = heads; + geom[1] = sectors; + geom[2] = cylinders; + return (0); +} +#endif + +/* + * Abort the current SCSI command(s). + */ +static int +ahc_linux_abort(Scsi_Cmnd *cmd) +{ + int error; + + error = ahc_linux_queue_recovery_cmd(cmd, SCB_ABORT); + if (error != 0) + printf("aic7xxx_abort returns 0x%x\n", error); + return (error); +} + +/* + * Attempt to send a target reset message to the device that timed out. + */ +static int +ahc_linux_dev_reset(Scsi_Cmnd *cmd) +{ + int error; + + error = ahc_linux_queue_recovery_cmd(cmd, SCB_DEVICE_RESET); + if (error != 0) + printf("aic7xxx_dev_reset returns 0x%x\n", error); + return (error); +} + +/* + * Reset the SCSI bus. + */ +static int +ahc_linux_bus_reset(Scsi_Cmnd *cmd) +{ + struct ahc_softc *ahc; + u_long s; + int found; + + ahc = *(struct ahc_softc **)cmd->device->host->hostdata; + ahc_midlayer_entrypoint_lock(ahc, &s); + found = ahc_reset_channel(ahc, cmd->device->channel + 'A', + /*initiate reset*/TRUE); + ahc_linux_run_complete_queue(ahc); + ahc_midlayer_entrypoint_unlock(ahc, &s); + + if (bootverbose) + printf("%s: SCSI bus reset delivered. " + "%d SCBs aborted.\n", ahc_name(ahc), found); + + return SUCCESS; +} + +Scsi_Host_Template aic7xxx_driver_template = { + .module = THIS_MODULE, + .name = "aic7xxx", + .proc_info = ahc_linux_proc_info, + .info = ahc_linux_info, + .queuecommand = ahc_linux_queue, + .eh_abort_handler = ahc_linux_abort, + .eh_device_reset_handler = ahc_linux_dev_reset, + .eh_bus_reset_handler = ahc_linux_bus_reset, +#if defined(__i386__) + .bios_param = ahc_linux_biosparam, +#endif + .can_queue = AHC_MAX_QUEUE, + .this_id = -1, + .cmd_per_lun = 2, + .use_clustering = ENABLE_CLUSTERING, + .slave_alloc = ahc_linux_slave_alloc, + .slave_configure = ahc_linux_slave_configure, + .slave_destroy = ahc_linux_slave_destroy, +}; + +/**************************** Tasklet Handler *********************************/ + +/* + * In 2.4.X and above, this routine is called from a tasklet, + * so we must re-acquire our lock prior to executing this code. + * In all prior kernels, ahc_schedule_runq() calls this routine + * directly and ahc_schedule_runq() is called with our lock held. + */ +static void +ahc_runq_tasklet(unsigned long data) +{ + struct ahc_softc* ahc; + struct ahc_linux_device *dev; + u_long flags; + + ahc = (struct ahc_softc *)data; + ahc_lock(ahc, &flags); + while ((dev = ahc_linux_next_device_to_run(ahc)) != NULL) { + + TAILQ_REMOVE(&ahc->platform_data->device_runq, dev, links); + dev->flags &= ~AHC_DEV_ON_RUN_LIST; + ahc_linux_check_device_queue(ahc, dev); + /* Yeild to our interrupt handler */ + ahc_unlock(ahc, &flags); + ahc_lock(ahc, &flags); + } + ahc_unlock(ahc, &flags); +} + +/******************************** Macros **************************************/ +#define BUILD_SCSIID(ahc, cmd) \ + ((((cmd)->device->id << TID_SHIFT) & TID) \ + | (((cmd)->device->channel == 0) ? (ahc)->our_id : (ahc)->our_id_b) \ + | (((cmd)->device->channel == 0) ? 0 : TWIN_CHNLB)) + +/******************************** Bus DMA *************************************/ +int +ahc_dma_tag_create(struct ahc_softc *ahc, bus_dma_tag_t parent, + bus_size_t alignment, bus_size_t boundary, + dma_addr_t lowaddr, dma_addr_t highaddr, + bus_dma_filter_t *filter, void *filterarg, + bus_size_t maxsize, int nsegments, + bus_size_t maxsegsz, int flags, bus_dma_tag_t *ret_tag) +{ + bus_dma_tag_t dmat; + + dmat = malloc(sizeof(*dmat), M_DEVBUF, M_NOWAIT); + if (dmat == NULL) + return (ENOMEM); + + /* + * Linux is very simplistic about DMA memory. For now don't + * maintain all specification information. Once Linux supplies + * better facilities for doing these operations, or the + * needs of this particular driver change, we might need to do + * more here. + */ + dmat->alignment = alignment; + dmat->boundary = boundary; + dmat->maxsize = maxsize; + *ret_tag = dmat; + return (0); +} + +void +ahc_dma_tag_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat) +{ + free(dmat, M_DEVBUF); +} + +int +ahc_dmamem_alloc(struct ahc_softc *ahc, bus_dma_tag_t dmat, void** vaddr, + int flags, bus_dmamap_t *mapp) +{ + bus_dmamap_t map; + + map = malloc(sizeof(*map), M_DEVBUF, M_NOWAIT); + if (map == NULL) + return (ENOMEM); + /* + * Although we can dma data above 4GB, our + * "consistent" memory is below 4GB for + * space efficiency reasons (only need a 4byte + * address). For this reason, we have to reset + * our dma mask when doing allocations. + */ + if (ahc->dev_softc != NULL) + if (pci_set_dma_mask(ahc->dev_softc, 0xFFFFFFFF)) { + printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n"); + kfree(map); + return (ENODEV); + } + *vaddr = pci_alloc_consistent(ahc->dev_softc, + dmat->maxsize, &map->bus_addr); + if (ahc->dev_softc != NULL) + if (pci_set_dma_mask(ahc->dev_softc, + ahc->platform_data->hw_dma_mask)) { + printk(KERN_WARNING "aic7xxx: No suitable DMA available.\n"); + kfree(map); + return (ENODEV); + } + if (*vaddr == NULL) + return (ENOMEM); + *mapp = map; + return(0); +} + +void +ahc_dmamem_free(struct ahc_softc *ahc, bus_dma_tag_t dmat, + void* vaddr, bus_dmamap_t map) +{ + pci_free_consistent(ahc->dev_softc, dmat->maxsize, + vaddr, map->bus_addr); +} + +int +ahc_dmamap_load(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map, + void *buf, bus_size_t buflen, bus_dmamap_callback_t *cb, + void *cb_arg, int flags) +{ + /* + * Assume for now that this will only be used during + * initialization and not for per-transaction buffer mapping. + */ + bus_dma_segment_t stack_sg; + + stack_sg.ds_addr = map->bus_addr; + stack_sg.ds_len = dmat->maxsize; + cb(cb_arg, &stack_sg, /*nseg*/1, /*error*/0); + return (0); +} + +void +ahc_dmamap_destroy(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map) +{ + /* + * The map may is NULL in our < 2.3.X implementation. + * Now it's 2.6.5, but just in case... + */ + BUG_ON(map == NULL); + free(map, M_DEVBUF); +} + +int +ahc_dmamap_unload(struct ahc_softc *ahc, bus_dma_tag_t dmat, bus_dmamap_t map) +{ + /* Nothing to do */ + return (0); +} + +/********************* Platform Dependent Functions ***************************/ +/* + * Compare "left hand" softc with "right hand" softc, returning: + * < 0 - lahc has a lower priority than rahc + * 0 - Softcs are equal + * > 0 - lahc has a higher priority than rahc + */ +int +ahc_softc_comp(struct ahc_softc *lahc, struct ahc_softc *rahc) +{ + int value; + int rvalue; + int lvalue; + + /* + * Under Linux, cards are ordered as follows: + * 1) VLB/EISA BIOS enabled devices sorted by BIOS address. + * 2) PCI devices with BIOS enabled sorted by bus/slot/func. + * 3) All remaining VLB/EISA devices sorted by ioport. + * 4) All remaining PCI devices sorted by bus/slot/func. + */ + value = (lahc->flags & AHC_BIOS_ENABLED) + - (rahc->flags & AHC_BIOS_ENABLED); + if (value != 0) + /* Controllers with BIOS enabled have a *higher* priority */ + return (value); + + /* + * Same BIOS setting, now sort based on bus type. + * EISA and VL controllers sort together. EISA/VL + * have higher priority than PCI. + */ + rvalue = (rahc->chip & AHC_BUS_MASK); + if (rvalue == AHC_VL) + rvalue = AHC_EISA; + lvalue = (lahc->chip & AHC_BUS_MASK); + if (lvalue == AHC_VL) + lvalue = AHC_EISA; + value = rvalue - lvalue; + if (value != 0) + return (value); + + /* Still equal. Sort by BIOS address, ioport, or bus/slot/func. */ + switch (rvalue) { +#ifdef CONFIG_PCI + case AHC_PCI: + { + char primary_channel; + + if (aic7xxx_reverse_scan != 0) + value = ahc_get_pci_bus(lahc->dev_softc) + - ahc_get_pci_bus(rahc->dev_softc); + else + value = ahc_get_pci_bus(rahc->dev_softc) + - ahc_get_pci_bus(lahc->dev_softc); + if (value != 0) + break; + if (aic7xxx_reverse_scan != 0) + value = ahc_get_pci_slot(lahc->dev_softc) + - ahc_get_pci_slot(rahc->dev_softc); + else + value = ahc_get_pci_slot(rahc->dev_softc) + - ahc_get_pci_slot(lahc->dev_softc); + if (value != 0) + break; + /* + * On multi-function devices, the user can choose + * to have function 1 probed before function 0. + * Give whichever channel is the primary channel + * the highest priority. + */ + primary_channel = (lahc->flags & AHC_PRIMARY_CHANNEL) + 'A'; + value = -1; + if (lahc->channel == primary_channel) + value = 1; + break; + } +#endif + case AHC_EISA: + if ((rahc->flags & AHC_BIOS_ENABLED) != 0) { + value = rahc->platform_data->bios_address + - lahc->platform_data->bios_address; + } else { + value = rahc->bsh.ioport + - lahc->bsh.ioport; + } + break; + default: + panic("ahc_softc_sort: invalid bus type"); + } + return (value); +} + +static void +ahc_linux_setup_tag_info_global(char *p) +{ + int tags, i, j; + + tags = simple_strtoul(p + 1, NULL, 0) & 0xff; + printf("Setting Global Tags= %d\n", tags); + + for (i = 0; i < NUM_ELEMENTS(aic7xxx_tag_info); i++) { + for (j = 0; j < AHC_NUM_TARGETS; j++) { + aic7xxx_tag_info[i].tag_commands[j] = tags; + } + } +} + +static void +ahc_linux_setup_tag_info(u_long arg, int instance, int targ, int32_t value) +{ + + if ((instance >= 0) && (targ >= 0) + && (instance < NUM_ELEMENTS(aic7xxx_tag_info)) + && (targ < AHC_NUM_TARGETS)) { + aic7xxx_tag_info[instance].tag_commands[targ] = value & 0xff; + if (bootverbose) + printf("tag_info[%d:%d] = %d\n", instance, targ, value); + } +} + +static void +ahc_linux_setup_dv(u_long arg, int instance, int targ, int32_t value) +{ + + if ((instance >= 0) + && (instance < NUM_ELEMENTS(aic7xxx_dv_settings))) { + aic7xxx_dv_settings[instance] = value; + if (bootverbose) + printf("dv[%d] = %d\n", instance, value); + } +} + +/* + * Handle Linux boot parameters. This routine allows for assigning a value + * to a parameter with a ':' between the parameter and the value. + * ie. aic7xxx=stpwlev:1,extended + */ +static int +aic7xxx_setup(char *s) +{ + int i, n; + char *p; + char *end; + + static struct { + const char *name; + uint32_t *flag; + } options[] = { + { "extended", &aic7xxx_extended }, + { "no_reset", &aic7xxx_no_reset }, + { "verbose", &aic7xxx_verbose }, + { "allow_memio", &aic7xxx_allow_memio}, +#ifdef AHC_DEBUG + { "debug", &ahc_debug }, +#endif + { "reverse_scan", &aic7xxx_reverse_scan }, + { "no_probe", &aic7xxx_probe_eisa_vl }, + { "probe_eisa_vl", &aic7xxx_probe_eisa_vl }, + { "periodic_otag", &aic7xxx_periodic_otag }, + { "pci_parity", &aic7xxx_pci_parity }, + { "seltime", &aic7xxx_seltime }, + { "tag_info", NULL }, + { "global_tag_depth", NULL }, + { "dv", NULL } + }; + + end = strchr(s, '\0'); + + /* + * XXX ia64 gcc isn't smart enough to know that NUM_ELEMENTS + * will never be 0 in this case. + */ + n = 0; + + while ((p = strsep(&s, ",.")) != NULL) { + if (*p == '\0') + continue; + for (i = 0; i < NUM_ELEMENTS(options); i++) { + + n = strlen(options[i].name); + if (strncmp(options[i].name, p, n) == 0) + break; + } + if (i == NUM_ELEMENTS(options)) + continue; + + if (strncmp(p, "global_tag_depth", n) == 0) { + ahc_linux_setup_tag_info_global(p + n); + } else if (strncmp(p, "tag_info", n) == 0) { + s = aic_parse_brace_option("tag_info", p + n, end, + 2, ahc_linux_setup_tag_info, 0); + } else if (strncmp(p, "dv", n) == 0) { + s = aic_parse_brace_option("dv", p + n, end, 1, + ahc_linux_setup_dv, 0); + } else if (p[n] == ':') { + *(options[i].flag) = simple_strtoul(p + n + 1, NULL, 0); + } else if (strncmp(p, "verbose", n) == 0) { + *(options[i].flag) = 1; + } else { + *(options[i].flag) ^= 0xFFFFFFFF; + } + } + return 1; +} + +__setup("aic7xxx=", aic7xxx_setup); + +uint32_t aic7xxx_verbose; + +int +ahc_linux_register_host(struct ahc_softc *ahc, Scsi_Host_Template *template) +{ + char buf[80]; + struct Scsi_Host *host; + char *new_name; + u_long s; + u_int targ_offset; + + template->name = ahc->description; + host = scsi_host_alloc(template, sizeof(struct ahc_softc *)); + if (host == NULL) + return (ENOMEM); + + *((struct ahc_softc **)host->hostdata) = ahc; + ahc_lock(ahc, &s); +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + scsi_assign_lock(host, &ahc->platform_data->spin_lock); +#elif AHC_SCSI_HAS_HOST_LOCK != 0 + host->lock = &ahc->platform_data->spin_lock; +#endif + ahc->platform_data->host = host; + host->can_queue = AHC_MAX_QUEUE; + host->cmd_per_lun = 2; + /* XXX No way to communicate the ID for multiple channels */ + host->this_id = ahc->our_id; + host->irq = ahc->platform_data->irq; + host->max_id = (ahc->features & AHC_WIDE) ? 16 : 8; + host->max_lun = AHC_NUM_LUNS; + host->max_channel = (ahc->features & AHC_TWIN) ? 1 : 0; + host->sg_tablesize = AHC_NSEG; + ahc_set_unit(ahc, ahc_linux_next_unit()); + sprintf(buf, "scsi%d", host->host_no); + new_name = malloc(strlen(buf) + 1, M_DEVBUF, M_NOWAIT); + if (new_name != NULL) { + strcpy(new_name, buf); + ahc_set_name(ahc, new_name); + } + host->unique_id = ahc->unit; +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + scsi_set_pci_device(host, ahc->dev_softc); +#endif + ahc_linux_initialize_scsi_bus(ahc); + ahc_unlock(ahc, &s); + ahc->platform_data->dv_pid = kernel_thread(ahc_linux_dv_thread, ahc, 0); + ahc_lock(ahc, &s); + if (ahc->platform_data->dv_pid < 0) { + printf("%s: Failed to create DV thread, error= %d\n", + ahc_name(ahc), ahc->platform_data->dv_pid); + return (-ahc->platform_data->dv_pid); + } + /* + * Initially allocate *all* of our linux target objects + * so that the DV thread will scan them all in parallel + * just after driver initialization. Any device that + * does not exist will have its target object destroyed + * by the selection timeout handler. In the case of a + * device that appears after the initial DV scan, async + * negotiation will occur for the first command, and DV + * will comence should that first command be successful. + */ + for (targ_offset = 0; + targ_offset < host->max_id * (host->max_channel + 1); + targ_offset++) { + u_int channel; + u_int target; + + channel = 0; + target = targ_offset; + if (target > 7 + && (ahc->features & AHC_TWIN) != 0) { + channel = 1; + target &= 0x7; + } + /* + * Skip our own ID. Some Compaq/HP storage devices + * have enclosure management devices that respond to + * single bit selection (i.e. selecting ourselves). + * It is expected that either an external application + * or a modified kernel will be used to probe this + * ID if it is appropriate. To accommodate these + * installations, ahc_linux_alloc_target() will allocate + * for our ID if asked to do so. + */ + if ((channel == 0 && target == ahc->our_id) + || (channel == 1 && target == ahc->our_id_b)) + continue; + + ahc_linux_alloc_target(ahc, channel, target); + } + ahc_intr_enable(ahc, TRUE); + ahc_linux_start_dv(ahc); + ahc_unlock(ahc, &s); + +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */ + scsi_scan_host(host); +#endif + return (0); +} + +uint64_t +ahc_linux_get_memsize(void) +{ + struct sysinfo si; + + si_meminfo(&si); + return ((uint64_t)si.totalram << PAGE_SHIFT); +} + +/* + * Find the smallest available unit number to use + * for a new device. We don't just use a static + * count to handle the "repeated hot-(un)plug" + * scenario. + */ +static int +ahc_linux_next_unit(void) +{ + struct ahc_softc *ahc; + int unit; + + unit = 0; +retry: + TAILQ_FOREACH(ahc, &ahc_tailq, links) { + if (ahc->unit == unit) { + unit++; + goto retry; + } + } + return (unit); +} + +/* + * Place the SCSI bus into a known state by either resetting it, + * or forcing transfer negotiations on the next command to any + * target. + */ +void +ahc_linux_initialize_scsi_bus(struct ahc_softc *ahc) +{ + int i; + int numtarg; + + i = 0; + numtarg = 0; + + if (aic7xxx_no_reset != 0) + ahc->flags &= ~(AHC_RESET_BUS_A|AHC_RESET_BUS_B); + + if ((ahc->flags & AHC_RESET_BUS_A) != 0) + ahc_reset_channel(ahc, 'A', /*initiate_reset*/TRUE); + else + numtarg = (ahc->features & AHC_WIDE) ? 16 : 8; + + if ((ahc->features & AHC_TWIN) != 0) { + + if ((ahc->flags & AHC_RESET_BUS_B) != 0) { + ahc_reset_channel(ahc, 'B', /*initiate_reset*/TRUE); + } else { + if (numtarg == 0) + i = 8; + numtarg += 8; + } + } + + /* + * Force negotiation to async for all targets that + * will not see an initial bus reset. + */ + for (; i < numtarg; i++) { + struct ahc_devinfo devinfo; + struct ahc_initiator_tinfo *tinfo; + struct ahc_tmode_tstate *tstate; + u_int our_id; + u_int target_id; + char channel; + + channel = 'A'; + our_id = ahc->our_id; + target_id = i; + if (i > 7 && (ahc->features & AHC_TWIN) != 0) { + channel = 'B'; + our_id = ahc->our_id_b; + target_id = i % 8; + } + tinfo = ahc_fetch_transinfo(ahc, channel, our_id, + target_id, &tstate); + ahc_compile_devinfo(&devinfo, our_id, target_id, + CAM_LUN_WILDCARD, channel, ROLE_INITIATOR); + ahc_update_neg_request(ahc, &devinfo, tstate, + tinfo, AHC_NEG_ALWAYS); + } + /* Give the bus some time to recover */ + if ((ahc->flags & (AHC_RESET_BUS_A|AHC_RESET_BUS_B)) != 0) { + ahc_linux_freeze_simq(ahc); + init_timer(&ahc->platform_data->reset_timer); + ahc->platform_data->reset_timer.data = (u_long)ahc; + ahc->platform_data->reset_timer.expires = + jiffies + (AIC7XXX_RESET_DELAY * HZ)/1000; + ahc->platform_data->reset_timer.function = + ahc_linux_release_simq; + add_timer(&ahc->platform_data->reset_timer); + } +} + +int +ahc_platform_alloc(struct ahc_softc *ahc, void *platform_arg) +{ + + ahc->platform_data = + malloc(sizeof(struct ahc_platform_data), M_DEVBUF, M_NOWAIT); + if (ahc->platform_data == NULL) + return (ENOMEM); + memset(ahc->platform_data, 0, sizeof(struct ahc_platform_data)); + TAILQ_INIT(&ahc->platform_data->completeq); + TAILQ_INIT(&ahc->platform_data->device_runq); + ahc->platform_data->irq = AHC_LINUX_NOIRQ; + ahc->platform_data->hw_dma_mask = 0xFFFFFFFF; + ahc_lockinit(ahc); + ahc_done_lockinit(ahc); + init_timer(&ahc->platform_data->completeq_timer); + ahc->platform_data->completeq_timer.data = (u_long)ahc; + ahc->platform_data->completeq_timer.function = + (ahc_linux_callback_t *)ahc_linux_thread_run_complete_queue; + init_MUTEX_LOCKED(&ahc->platform_data->eh_sem); + init_MUTEX_LOCKED(&ahc->platform_data->dv_sem); + init_MUTEX_LOCKED(&ahc->platform_data->dv_cmd_sem); + tasklet_init(&ahc->platform_data->runq_tasklet, ahc_runq_tasklet, + (unsigned long)ahc); + ahc->seltime = (aic7xxx_seltime & 0x3) << 4; + ahc->seltime_b = (aic7xxx_seltime & 0x3) << 4; + if (aic7xxx_pci_parity == 0) + ahc->flags |= AHC_DISABLE_PCI_PERR; + + return (0); +} + +void +ahc_platform_free(struct ahc_softc *ahc) +{ + struct ahc_linux_target *targ; + struct ahc_linux_device *dev; + int i, j; + + if (ahc->platform_data != NULL) { + del_timer_sync(&ahc->platform_data->completeq_timer); + ahc_linux_kill_dv_thread(ahc); + tasklet_kill(&ahc->platform_data->runq_tasklet); + if (ahc->platform_data->host != NULL) { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + scsi_remove_host(ahc->platform_data->host); +#endif + scsi_host_put(ahc->platform_data->host); + } + + /* destroy all of the device and target objects */ + for (i = 0; i < AHC_NUM_TARGETS; i++) { + targ = ahc->platform_data->targets[i]; + if (targ != NULL) { + /* Keep target around through the loop. */ + targ->refcount++; + for (j = 0; j < AHC_NUM_LUNS; j++) { + + if (targ->devices[j] == NULL) + continue; + dev = targ->devices[j]; + ahc_linux_free_device(ahc, dev); + } + /* + * Forcibly free the target now that + * all devices are gone. + */ + ahc_linux_free_target(ahc, targ); + } + } + + if (ahc->platform_data->irq != AHC_LINUX_NOIRQ) + free_irq(ahc->platform_data->irq, ahc); + if (ahc->tag == BUS_SPACE_PIO + && ahc->bsh.ioport != 0) + release_region(ahc->bsh.ioport, 256); + if (ahc->tag == BUS_SPACE_MEMIO + && ahc->bsh.maddr != NULL) { + iounmap(ahc->bsh.maddr); + release_mem_region(ahc->platform_data->mem_busaddr, + 0x1000); + } +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + /* + * In 2.4 we detach from the scsi midlayer before the PCI + * layer invokes our remove callback. No per-instance + * detach is provided, so we must reach inside the PCI + * subsystem's internals and detach our driver manually. + */ + if (ahc->dev_softc != NULL) + ahc->dev_softc->driver = NULL; +#endif + free(ahc->platform_data, M_DEVBUF); + } +} + +void +ahc_platform_freeze_devq(struct ahc_softc *ahc, struct scb *scb) +{ + ahc_platform_abort_scbs(ahc, SCB_GET_TARGET(ahc, scb), + SCB_GET_CHANNEL(ahc, scb), + SCB_GET_LUN(scb), SCB_LIST_NULL, + ROLE_UNKNOWN, CAM_REQUEUE_REQ); +} + +void +ahc_platform_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo, + ahc_queue_alg alg) +{ + struct ahc_linux_device *dev; + int was_queuing; + int now_queuing; + + dev = ahc_linux_get_device(ahc, devinfo->channel - 'A', + devinfo->target, + devinfo->lun, /*alloc*/FALSE); + if (dev == NULL) + return; + was_queuing = dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED); + switch (alg) { + default: + case AHC_QUEUE_NONE: + now_queuing = 0; + break; + case AHC_QUEUE_BASIC: + now_queuing = AHC_DEV_Q_BASIC; + break; + case AHC_QUEUE_TAGGED: + now_queuing = AHC_DEV_Q_TAGGED; + break; + } + if ((dev->flags & AHC_DEV_FREEZE_TIL_EMPTY) == 0 + && (was_queuing != now_queuing) + && (dev->active != 0)) { + dev->flags |= AHC_DEV_FREEZE_TIL_EMPTY; + dev->qfrozen++; + } + + dev->flags &= ~(AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED|AHC_DEV_PERIODIC_OTAG); + if (now_queuing) { + u_int usertags; + + usertags = ahc_linux_user_tagdepth(ahc, devinfo); + if (!was_queuing) { + /* + * Start out agressively and allow our + * dynamic queue depth algorithm to take + * care of the rest. + */ + dev->maxtags = usertags; + dev->openings = dev->maxtags - dev->active; + } + if (dev->maxtags == 0) { + /* + * Queueing is disabled by the user. + */ + dev->openings = 1; + } else if (alg == AHC_QUEUE_TAGGED) { + dev->flags |= AHC_DEV_Q_TAGGED; + if (aic7xxx_periodic_otag != 0) + dev->flags |= AHC_DEV_PERIODIC_OTAG; + } else + dev->flags |= AHC_DEV_Q_BASIC; + } else { + /* We can only have one opening. */ + dev->maxtags = 0; + dev->openings = 1 - dev->active; + } +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + if (dev->scsi_device != NULL) { + switch ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED))) { + case AHC_DEV_Q_BASIC: + scsi_adjust_queue_depth(dev->scsi_device, + MSG_SIMPLE_TASK, + dev->openings + dev->active); + break; + case AHC_DEV_Q_TAGGED: + scsi_adjust_queue_depth(dev->scsi_device, + MSG_ORDERED_TASK, + dev->openings + dev->active); + break; + default: + /* + * We allow the OS to queue 2 untagged transactions to + * us at any time even though we can only execute them + * serially on the controller/device. This should + * remove some latency. + */ + scsi_adjust_queue_depth(dev->scsi_device, + /*NON-TAGGED*/0, + /*queue depth*/2); + break; + } + } +#endif +} + +int +ahc_platform_abort_scbs(struct ahc_softc *ahc, int target, char channel, + int lun, u_int tag, role_t role, uint32_t status) +{ + int chan; + int maxchan; + int targ; + int maxtarg; + int clun; + int maxlun; + int count; + + if (tag != SCB_LIST_NULL) + return (0); + + chan = 0; + if (channel != ALL_CHANNELS) { + chan = channel - 'A'; + maxchan = chan + 1; + } else { + maxchan = (ahc->features & AHC_TWIN) ? 2 : 1; + } + targ = 0; + if (target != CAM_TARGET_WILDCARD) { + targ = target; + maxtarg = targ + 1; + } else { + maxtarg = (ahc->features & AHC_WIDE) ? 16 : 8; + } + clun = 0; + if (lun != CAM_LUN_WILDCARD) { + clun = lun; + maxlun = clun + 1; + } else { + maxlun = AHC_NUM_LUNS; + } + + count = 0; + for (; chan < maxchan; chan++) { + + for (; targ < maxtarg; targ++) { + + for (; clun < maxlun; clun++) { + struct ahc_linux_device *dev; + struct ahc_busyq *busyq; + struct ahc_cmd *acmd; + + dev = ahc_linux_get_device(ahc, chan, + targ, clun, + /*alloc*/FALSE); + if (dev == NULL) + continue; + + busyq = &dev->busyq; + while ((acmd = TAILQ_FIRST(busyq)) != NULL) { + Scsi_Cmnd *cmd; + + cmd = &acmd_scsi_cmd(acmd); + TAILQ_REMOVE(busyq, acmd, + acmd_links.tqe); + count++; + cmd->result = status << 16; + ahc_linux_queue_cmd_complete(ahc, cmd); + } + } + } + } + + return (count); +} + +static void +ahc_linux_thread_run_complete_queue(struct ahc_softc *ahc) +{ + u_long flags; + + ahc_lock(ahc, &flags); + del_timer(&ahc->platform_data->completeq_timer); + ahc->platform_data->flags &= ~AHC_RUN_CMPLT_Q_TIMER; + ahc_linux_run_complete_queue(ahc); + ahc_unlock(ahc, &flags); +} + +static void +ahc_linux_start_dv(struct ahc_softc *ahc) +{ + + /* + * Freeze the simq and signal ahc_linux_queue to not let any + * more commands through. + */ + if ((ahc->platform_data->flags & AHC_DV_ACTIVE) == 0) { +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) + printf("%s: Waking DV thread\n", ahc_name(ahc)); +#endif + + ahc->platform_data->flags |= AHC_DV_ACTIVE; + ahc_linux_freeze_simq(ahc); + + /* Wake up the DV kthread */ + up(&ahc->platform_data->dv_sem); + } +} + +static void +ahc_linux_kill_dv_thread(struct ahc_softc *ahc) +{ + u_long s; + + ahc_lock(ahc, &s); + if (ahc->platform_data->dv_pid != 0) { + ahc->platform_data->flags |= AHC_DV_SHUTDOWN; + ahc_unlock(ahc, &s); + up(&ahc->platform_data->dv_sem); + + /* + * Use the eh_sem as an indicator that the + * dv thread is exiting. Note that the dv + * thread must still return after performing + * the up on our semaphore before it has + * completely exited this module. Unfortunately, + * there seems to be no easy way to wait for the + * exit of a thread for which you are not the + * parent (dv threads are parented by init). + * Cross your fingers... + */ + down(&ahc->platform_data->eh_sem); + + /* + * Mark the dv thread as already dead. This + * avoids attempting to kill it a second time. + * This is necessary because we must kill the + * DV thread before calling ahc_free() in the + * module shutdown case to avoid bogus locking + * in the SCSI mid-layer, but we ahc_free() is + * called without killing the DV thread in the + * instance detach case, so ahc_platform_free() + * calls us again to verify that the DV thread + * is dead. + */ + ahc->platform_data->dv_pid = 0; + } else { + ahc_unlock(ahc, &s); + } +} + +static int +ahc_linux_dv_thread(void *data) +{ + struct ahc_softc *ahc; + int target; + u_long s; + + ahc = (struct ahc_softc *)data; + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) + printf("Launching DV Thread\n"); +#endif + + /* + * Complete thread creation. + */ + lock_kernel(); +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + /* + * Don't care about any signals. + */ + siginitsetinv(¤t->blocked, 0); + + daemonize(); + sprintf(current->comm, "ahc_dv_%d", ahc->unit); +#else + daemonize("ahc_dv_%d", ahc->unit); + current->flags |= PF_FREEZE; +#endif + unlock_kernel(); + + while (1) { + /* + * Use down_interruptible() rather than down() to + * avoid inclusion in the load average. + */ + down_interruptible(&ahc->platform_data->dv_sem); + + /* Check to see if we've been signaled to exit */ + ahc_lock(ahc, &s); + if ((ahc->platform_data->flags & AHC_DV_SHUTDOWN) != 0) { + ahc_unlock(ahc, &s); + break; + } + ahc_unlock(ahc, &s); + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) + printf("%s: Beginning Domain Validation\n", + ahc_name(ahc)); +#endif + + /* + * Wait for any pending commands to drain before proceeding. + */ + ahc_lock(ahc, &s); + while (LIST_FIRST(&ahc->pending_scbs) != NULL) { + ahc->platform_data->flags |= AHC_DV_WAIT_SIMQ_EMPTY; + ahc_unlock(ahc, &s); + down_interruptible(&ahc->platform_data->dv_sem); + ahc_lock(ahc, &s); + } + + /* + * Wait for the SIMQ to be released so that DV is the + * only reason the queue is frozen. + */ + while (AHC_DV_SIMQ_FROZEN(ahc) == 0) { + ahc->platform_data->flags |= AHC_DV_WAIT_SIMQ_RELEASE; + ahc_unlock(ahc, &s); + down_interruptible(&ahc->platform_data->dv_sem); + ahc_lock(ahc, &s); + } + ahc_unlock(ahc, &s); + + for (target = 0; target < AHC_NUM_TARGETS; target++) + ahc_linux_dv_target(ahc, target); + + ahc_lock(ahc, &s); + ahc->platform_data->flags &= ~AHC_DV_ACTIVE; + ahc_unlock(ahc, &s); + + /* + * Release the SIMQ so that normal commands are + * allowed to continue on the bus. + */ + ahc_linux_release_simq((u_long)ahc); + } + up(&ahc->platform_data->eh_sem); + return (0); +} + +#define AHC_LINUX_DV_INQ_SHORT_LEN 36 +#define AHC_LINUX_DV_INQ_LEN 256 +#define AHC_LINUX_DV_TIMEOUT (HZ / 4) + +#define AHC_SET_DV_STATE(ahc, targ, newstate) \ + ahc_set_dv_state(ahc, targ, newstate, __LINE__) + +static __inline void +ahc_set_dv_state(struct ahc_softc *ahc, struct ahc_linux_target *targ, + ahc_dv_state newstate, u_int line) +{ + ahc_dv_state oldstate; + + oldstate = targ->dv_state; +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) + printf("%s:%d: Going from state %d to state %d\n", + ahc_name(ahc), line, oldstate, newstate); +#endif + + if (oldstate == newstate) + targ->dv_state_retry++; + else + targ->dv_state_retry = 0; + targ->dv_state = newstate; +} + +static void +ahc_linux_dv_target(struct ahc_softc *ahc, u_int target_offset) +{ + struct ahc_devinfo devinfo; + struct ahc_linux_target *targ; + struct scsi_cmnd *cmd; + struct scsi_device *scsi_dev; + struct scsi_sense_data *sense; + uint8_t *buffer; + u_long s; + u_int timeout; + int echo_size; + + sense = NULL; + buffer = NULL; + echo_size = 0; + ahc_lock(ahc, &s); + targ = ahc->platform_data->targets[target_offset]; + if (targ == NULL || (targ->flags & AHC_DV_REQUIRED) == 0) { + ahc_unlock(ahc, &s); + return; + } + ahc_compile_devinfo(&devinfo, + targ->channel == 0 ? ahc->our_id : ahc->our_id_b, + targ->target, /*lun*/0, targ->channel + 'A', + ROLE_INITIATOR); +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, &devinfo); + printf("Performing DV\n"); + } +#endif + + ahc_unlock(ahc, &s); + + cmd = malloc(sizeof(struct scsi_cmnd), M_DEVBUF, M_WAITOK); + scsi_dev = malloc(sizeof(struct scsi_device), M_DEVBUF, M_WAITOK); + scsi_dev->host = ahc->platform_data->host; + scsi_dev->id = devinfo.target; + scsi_dev->lun = devinfo.lun; + scsi_dev->channel = devinfo.channel - 'A'; + ahc->platform_data->dv_scsi_dev = scsi_dev; + + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_INQ_SHORT_ASYNC); + + while (targ->dv_state != AHC_DV_STATE_EXIT) { + timeout = AHC_LINUX_DV_TIMEOUT; + switch (targ->dv_state) { + case AHC_DV_STATE_INQ_SHORT_ASYNC: + case AHC_DV_STATE_INQ_ASYNC: + case AHC_DV_STATE_INQ_ASYNC_VERIFY: + /* + * Set things to async narrow to reduce the + * chance that the INQ will fail. + */ + ahc_lock(ahc, &s); + ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0, + AHC_TRANS_GOAL, /*paused*/FALSE); + ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT, + AHC_TRANS_GOAL, /*paused*/FALSE); + ahc_unlock(ahc, &s); + timeout = 10 * HZ; + targ->flags &= ~AHC_INQ_VALID; + /* FALLTHROUGH */ + case AHC_DV_STATE_INQ_VERIFY: + { + u_int inq_len; + + if (targ->dv_state == AHC_DV_STATE_INQ_SHORT_ASYNC) + inq_len = AHC_LINUX_DV_INQ_SHORT_LEN; + else + inq_len = targ->inq_data->additional_length + 5; + ahc_linux_dv_inq(ahc, cmd, &devinfo, targ, inq_len); + break; + } + case AHC_DV_STATE_TUR: + case AHC_DV_STATE_BUSY: + timeout = 5 * HZ; + ahc_linux_dv_tur(ahc, cmd, &devinfo); + break; + case AHC_DV_STATE_REBD: + ahc_linux_dv_rebd(ahc, cmd, &devinfo, targ); + break; + case AHC_DV_STATE_WEB: + ahc_linux_dv_web(ahc, cmd, &devinfo, targ); + break; + + case AHC_DV_STATE_REB: + ahc_linux_dv_reb(ahc, cmd, &devinfo, targ); + break; + + case AHC_DV_STATE_SU: + ahc_linux_dv_su(ahc, cmd, &devinfo, targ); + timeout = 50 * HZ; + break; + + default: + ahc_print_devinfo(ahc, &devinfo); + printf("Unknown DV state %d\n", targ->dv_state); + goto out; + } + + /* Queue the command and wait for it to complete */ + /* Abuse eh_timeout in the scsi_cmnd struct for our purposes */ + init_timer(&cmd->eh_timeout); +#ifdef AHC_DEBUG + if ((ahc_debug & AHC_SHOW_MESSAGES) != 0) + /* + * All of the printfs during negotiation + * really slow down the negotiation. + * Add a bit of time just to be safe. + */ + timeout += HZ; +#endif + scsi_add_timer(cmd, timeout, ahc_linux_dv_timeout); + /* + * In 2.5.X, it is assumed that all calls from the + * "midlayer" (which we are emulating) will have the + * ahc host lock held. For other kernels, the + * io_request_lock must be held. + */ +#if AHC_SCSI_HAS_HOST_LOCK != 0 + ahc_lock(ahc, &s); +#else + spin_lock_irqsave(&io_request_lock, s); +#endif + ahc_linux_queue(cmd, ahc_linux_dv_complete); +#if AHC_SCSI_HAS_HOST_LOCK != 0 + ahc_unlock(ahc, &s); +#else + spin_unlock_irqrestore(&io_request_lock, s); +#endif + down_interruptible(&ahc->platform_data->dv_cmd_sem); + /* + * Wait for the SIMQ to be released so that DV is the + * only reason the queue is frozen. + */ + ahc_lock(ahc, &s); + while (AHC_DV_SIMQ_FROZEN(ahc) == 0) { + ahc->platform_data->flags |= AHC_DV_WAIT_SIMQ_RELEASE; + ahc_unlock(ahc, &s); + down_interruptible(&ahc->platform_data->dv_sem); + ahc_lock(ahc, &s); + } + ahc_unlock(ahc, &s); + + ahc_linux_dv_transition(ahc, cmd, &devinfo, targ); + } + +out: + if ((targ->flags & AHC_INQ_VALID) != 0 + && ahc_linux_get_device(ahc, devinfo.channel - 'A', + devinfo.target, devinfo.lun, + /*alloc*/FALSE) == NULL) { + /* + * The DV state machine failed to configure this device. + * This is normal if DV is disabled. Since we have inquiry + * data, filter it and use the "optimistic" negotiation + * parameters found in the inquiry string. + */ + ahc_linux_filter_inquiry(ahc, &devinfo); + if ((targ->flags & (AHC_BASIC_DV|AHC_ENHANCED_DV)) != 0) { + ahc_print_devinfo(ahc, &devinfo); + printf("DV failed to configure device. " + "Please file a bug report against " + "this driver.\n"); + } + } + + if (cmd != NULL) + free(cmd, M_DEVBUF); + + if (ahc->platform_data->dv_scsi_dev != NULL) { + free(ahc->platform_data->dv_scsi_dev, M_DEVBUF); + ahc->platform_data->dv_scsi_dev = NULL; + } + + ahc_lock(ahc, &s); + if (targ->dv_buffer != NULL) { + free(targ->dv_buffer, M_DEVBUF); + targ->dv_buffer = NULL; + } + if (targ->dv_buffer1 != NULL) { + free(targ->dv_buffer1, M_DEVBUF); + targ->dv_buffer1 = NULL; + } + targ->flags &= ~AHC_DV_REQUIRED; + if (targ->refcount == 0) + ahc_linux_free_target(ahc, targ); + ahc_unlock(ahc, &s); +} + +static void +ahc_linux_dv_transition(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ) +{ + u_int32_t status; + + status = aic_error_action(cmd, targ->inq_data, + ahc_cmd_get_transaction_status(cmd), + ahc_cmd_get_scsi_status(cmd)); + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Entering ahc_linux_dv_transition, state= %d, " + "status= 0x%x, cmd->result= 0x%x\n", targ->dv_state, + status, cmd->result); + } +#endif + + switch (targ->dv_state) { + case AHC_DV_STATE_INQ_SHORT_ASYNC: + case AHC_DV_STATE_INQ_ASYNC: + switch (status & SS_MASK) { + case SS_NOP: + { + AHC_SET_DV_STATE(ahc, targ, targ->dv_state+1); + break; + } + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_TUR: + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) + targ->dv_state_retry--; + if ((status & SS_ERRMASK) == EBUSY) + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_BUSY); + if (targ->dv_state_retry < 10) + break; + /* FALLTHROUGH */ + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Failed DV inquiry, skipping\n"); + } +#endif + break; + } + break; + case AHC_DV_STATE_INQ_ASYNC_VERIFY: + switch (status & SS_MASK) { + case SS_NOP: + { + u_int xportflags; + u_int spi3data; + + if (memcmp(targ->inq_data, targ->dv_buffer, + AHC_LINUX_DV_INQ_LEN) != 0) { + /* + * Inquiry data must have changed. + * Try from the top again. + */ + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + } + + AHC_SET_DV_STATE(ahc, targ, targ->dv_state+1); + targ->flags |= AHC_INQ_VALID; + if (ahc_linux_user_dv_setting(ahc) == 0) + break; + + xportflags = targ->inq_data->flags; + if ((xportflags & (SID_Sync|SID_WBus16)) == 0) + break; + + spi3data = targ->inq_data->spi3data; + switch (spi3data & SID_SPI_CLOCK_DT_ST) { + default: + case SID_SPI_CLOCK_ST: + /* Assume only basic DV is supported. */ + targ->flags |= AHC_BASIC_DV; + break; + case SID_SPI_CLOCK_DT: + case SID_SPI_CLOCK_DT_ST: + targ->flags |= AHC_ENHANCED_DV; + break; + } + break; + } + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_TUR: + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) + targ->dv_state_retry--; + + if ((status & SS_ERRMASK) == EBUSY) + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_BUSY); + if (targ->dv_state_retry < 10) + break; + /* FALLTHROUGH */ + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Failed DV inquiry, skipping\n"); + } +#endif + break; + } + break; + case AHC_DV_STATE_INQ_VERIFY: + switch (status & SS_MASK) { + case SS_NOP: + { + + if (memcmp(targ->inq_data, targ->dv_buffer, + AHC_LINUX_DV_INQ_LEN) == 0) { + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + int i; + + ahc_print_devinfo(ahc, devinfo); + printf("Inquiry buffer mismatch:"); + for (i = 0; i < AHC_LINUX_DV_INQ_LEN; i++) { + if ((i & 0xF) == 0) + printf("\n "); + printf("0x%x:0x0%x ", + ((uint8_t *)targ->inq_data)[i], + targ->dv_buffer[i]); + } + printf("\n"); + } +#endif + + if (ahc_linux_fallback(ahc, devinfo) != 0) { + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + /* + * Do not count "falling back" + * against our retries. + */ + targ->dv_state_retry = 0; + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + break; + } + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_TUR: + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) { + targ->dv_state_retry--; + } else if ((status & SSQ_FALLBACK) != 0) { + if (ahc_linux_fallback(ahc, devinfo) != 0) { + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_EXIT); + break; + } + /* + * Do not count "falling back" + * against our retries. + */ + targ->dv_state_retry = 0; + } else if ((status & SS_ERRMASK) == EBUSY) + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_BUSY); + if (targ->dv_state_retry < 10) + break; + /* FALLTHROUGH */ + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Failed DV inquiry, skipping\n"); + } +#endif + break; + } + break; + + case AHC_DV_STATE_TUR: + switch (status & SS_MASK) { + case SS_NOP: + if ((targ->flags & AHC_BASIC_DV) != 0) { + ahc_linux_filter_inquiry(ahc, devinfo); + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_VERIFY); + } else if ((targ->flags & AHC_ENHANCED_DV) != 0) { + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_REBD); + } else { + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + } + break; + case SS_RETRY: + case SS_TUR: + if ((status & SS_ERRMASK) == EBUSY) { + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_BUSY); + break; + } + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) { + targ->dv_state_retry--; + } else if ((status & SSQ_FALLBACK) != 0) { + if (ahc_linux_fallback(ahc, devinfo) != 0) { + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_EXIT); + break; + } + /* + * Do not count "falling back" + * against our retries. + */ + targ->dv_state_retry = 0; + } + if (targ->dv_state_retry >= 10) { +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("DV TUR reties exhausted\n"); + } +#endif + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + if (status & SSQ_DELAY) + ssleep(1); + + break; + case SS_START: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_SU); + break; + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + break; + + case AHC_DV_STATE_REBD: + switch (status & SS_MASK) { + case SS_NOP: + { + uint32_t echo_size; + + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_WEB); + echo_size = scsi_3btoul(&targ->dv_buffer[1]); + echo_size &= 0x1FFF; +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Echo buffer size= %d\n", echo_size); + } +#endif + if (echo_size == 0) { + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + + /* Generate the buffer pattern */ + targ->dv_echo_size = echo_size; + ahc_linux_generate_dv_pattern(targ); + /* + * Setup initial negotiation values. + */ + ahc_linux_filter_inquiry(ahc, devinfo); + break; + } + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) + targ->dv_state_retry--; + if (targ->dv_state_retry <= 10) + break; +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("DV REBD reties exhausted\n"); + } +#endif + /* FALLTHROUGH */ + case SS_FATAL: + default: + /* + * Setup initial negotiation values + * and try level 1 DV. + */ + ahc_linux_filter_inquiry(ahc, devinfo); + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_INQ_VERIFY); + targ->dv_echo_size = 0; + break; + } + break; + + case AHC_DV_STATE_WEB: + switch (status & SS_MASK) { + case SS_NOP: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_REB); + break; + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) { + targ->dv_state_retry--; + } else if ((status & SSQ_FALLBACK) != 0) { + if (ahc_linux_fallback(ahc, devinfo) != 0) { + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_EXIT); + break; + } + /* + * Do not count "falling back" + * against our retries. + */ + targ->dv_state_retry = 0; + } + if (targ->dv_state_retry <= 10) + break; + /* FALLTHROUGH */ +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("DV WEB reties exhausted\n"); + } +#endif + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + break; + + case AHC_DV_STATE_REB: + switch (status & SS_MASK) { + case SS_NOP: + if (memcmp(targ->dv_buffer, targ->dv_buffer1, + targ->dv_echo_size) != 0) { + if (ahc_linux_fallback(ahc, devinfo) != 0) + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_EXIT); + else + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_WEB); + break; + } + + if (targ->dv_buffer != NULL) { + free(targ->dv_buffer, M_DEVBUF); + targ->dv_buffer = NULL; + } + if (targ->dv_buffer1 != NULL) { + free(targ->dv_buffer1, M_DEVBUF); + targ->dv_buffer1 = NULL; + } + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) { + targ->dv_state_retry--; + } else if ((status & SSQ_FALLBACK) != 0) { + if (ahc_linux_fallback(ahc, devinfo) != 0) { + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_EXIT); + break; + } + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_WEB); + } + if (targ->dv_state_retry <= 10) { + if ((status & (SSQ_DELAY_RANDOM|SSQ_DELAY))!= 0) + msleep(ahc->our_id*1000/10); + break; + } +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("DV REB reties exhausted\n"); + } +#endif + /* FALLTHROUGH */ + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + break; + + case AHC_DV_STATE_SU: + switch (status & SS_MASK) { + case SS_NOP: + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + break; + + case AHC_DV_STATE_BUSY: + switch (status & SS_MASK) { + case SS_NOP: + case SS_INQ_REFRESH: + AHC_SET_DV_STATE(ahc, targ, + AHC_DV_STATE_INQ_SHORT_ASYNC); + break; + case SS_TUR: + case SS_RETRY: + AHC_SET_DV_STATE(ahc, targ, targ->dv_state); + if (ahc_cmd_get_transaction_status(cmd) + == CAM_REQUEUE_REQ) { + targ->dv_state_retry--; + } else if (targ->dv_state_retry < 60) { + if ((status & SSQ_DELAY) != 0) + ssleep(1); + } else { +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("DV BUSY reties exhausted\n"); + } +#endif + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + } + break; + default: + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } + break; + + default: + printf("%s: Invalid DV completion state %d\n", ahc_name(ahc), + targ->dv_state); + AHC_SET_DV_STATE(ahc, targ, AHC_DV_STATE_EXIT); + break; + } +} + +static void +ahc_linux_dv_fill_cmd(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo) +{ + memset(cmd, 0, sizeof(struct scsi_cmnd)); + cmd->device = ahc->platform_data->dv_scsi_dev; + cmd->scsi_done = ahc_linux_dv_complete; +} + +/* + * Synthesize an inquiry command. On the return trip, it'll be + * sniffed and the device transfer settings set for us. + */ +static void +ahc_linux_dv_inq(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, struct ahc_linux_target *targ, + u_int request_length) +{ + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Sending INQ\n"); + } +#endif + if (targ->inq_data == NULL) + targ->inq_data = malloc(AHC_LINUX_DV_INQ_LEN, + M_DEVBUF, M_WAITOK); + if (targ->dv_state > AHC_DV_STATE_INQ_ASYNC) { + if (targ->dv_buffer != NULL) + free(targ->dv_buffer, M_DEVBUF); + targ->dv_buffer = malloc(AHC_LINUX_DV_INQ_LEN, + M_DEVBUF, M_WAITOK); + } + + ahc_linux_dv_fill_cmd(ahc, cmd, devinfo); + cmd->sc_data_direction = SCSI_DATA_READ; + cmd->cmd_len = 6; + cmd->cmnd[0] = INQUIRY; + cmd->cmnd[4] = request_length; + cmd->request_bufflen = request_length; + if (targ->dv_state > AHC_DV_STATE_INQ_ASYNC) + cmd->request_buffer = targ->dv_buffer; + else + cmd->request_buffer = targ->inq_data; + memset(cmd->request_buffer, 0, AHC_LINUX_DV_INQ_LEN); +} + +static void +ahc_linux_dv_tur(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo) +{ + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Sending TUR\n"); + } +#endif + /* Do a TUR to clear out any non-fatal transitional state */ + ahc_linux_dv_fill_cmd(ahc, cmd, devinfo); + cmd->sc_data_direction = SCSI_DATA_NONE; + cmd->cmd_len = 6; + cmd->cmnd[0] = TEST_UNIT_READY; +} + +#define AHC_REBD_LEN 4 + +static void +ahc_linux_dv_rebd(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, struct ahc_linux_target *targ) +{ + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Sending REBD\n"); + } +#endif + if (targ->dv_buffer != NULL) + free(targ->dv_buffer, M_DEVBUF); + targ->dv_buffer = malloc(AHC_REBD_LEN, M_DEVBUF, M_WAITOK); + ahc_linux_dv_fill_cmd(ahc, cmd, devinfo); + cmd->sc_data_direction = SCSI_DATA_READ; + cmd->cmd_len = 10; + cmd->cmnd[0] = READ_BUFFER; + cmd->cmnd[1] = 0x0b; + scsi_ulto3b(AHC_REBD_LEN, &cmd->cmnd[6]); + cmd->request_bufflen = AHC_REBD_LEN; + cmd->underflow = cmd->request_bufflen; + cmd->request_buffer = targ->dv_buffer; +} + +static void +ahc_linux_dv_web(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, struct ahc_linux_target *targ) +{ + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Sending WEB\n"); + } +#endif + ahc_linux_dv_fill_cmd(ahc, cmd, devinfo); + cmd->sc_data_direction = SCSI_DATA_WRITE; + cmd->cmd_len = 10; + cmd->cmnd[0] = WRITE_BUFFER; + cmd->cmnd[1] = 0x0a; + scsi_ulto3b(targ->dv_echo_size, &cmd->cmnd[6]); + cmd->request_bufflen = targ->dv_echo_size; + cmd->underflow = cmd->request_bufflen; + cmd->request_buffer = targ->dv_buffer; +} + +static void +ahc_linux_dv_reb(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, struct ahc_linux_target *targ) +{ + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Sending REB\n"); + } +#endif + ahc_linux_dv_fill_cmd(ahc, cmd, devinfo); + cmd->sc_data_direction = SCSI_DATA_READ; + cmd->cmd_len = 10; + cmd->cmnd[0] = READ_BUFFER; + cmd->cmnd[1] = 0x0a; + scsi_ulto3b(targ->dv_echo_size, &cmd->cmnd[6]); + cmd->request_bufflen = targ->dv_echo_size; + cmd->underflow = cmd->request_bufflen; + cmd->request_buffer = targ->dv_buffer1; +} + +static void +ahc_linux_dv_su(struct ahc_softc *ahc, struct scsi_cmnd *cmd, + struct ahc_devinfo *devinfo, + struct ahc_linux_target *targ) +{ + u_int le; + + le = SID_IS_REMOVABLE(targ->inq_data) ? SSS_LOEJ : 0; + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Sending SU\n"); + } +#endif + ahc_linux_dv_fill_cmd(ahc, cmd, devinfo); + cmd->sc_data_direction = SCSI_DATA_NONE; + cmd->cmd_len = 6; + cmd->cmnd[0] = START_STOP_UNIT; + cmd->cmnd[4] = le | SSS_START; +} + +static int +ahc_linux_fallback(struct ahc_softc *ahc, struct ahc_devinfo *devinfo) +{ + struct ahc_linux_target *targ; + struct ahc_initiator_tinfo *tinfo; + struct ahc_transinfo *goal; + struct ahc_tmode_tstate *tstate; + struct ahc_syncrate *syncrate; + u_long s; + u_int width; + u_int period; + u_int offset; + u_int ppr_options; + u_int cur_speed; + u_int wide_speed; + u_int narrow_speed; + u_int fallback_speed; + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + ahc_print_devinfo(ahc, devinfo); + printf("Trying to fallback\n"); + } +#endif + ahc_lock(ahc, &s); + targ = ahc->platform_data->targets[devinfo->target_offset]; + tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, + devinfo->our_scsiid, + devinfo->target, &tstate); + goal = &tinfo->goal; + width = goal->width; + period = goal->period; + offset = goal->offset; + ppr_options = goal->ppr_options; + if (offset == 0) + period = AHC_ASYNC_XFER_PERIOD; + if (targ->dv_next_narrow_period == 0) + targ->dv_next_narrow_period = MAX(period, AHC_SYNCRATE_ULTRA2); + if (targ->dv_next_wide_period == 0) + targ->dv_next_wide_period = period; + if (targ->dv_max_width == 0) + targ->dv_max_width = width; + if (targ->dv_max_ppr_options == 0) + targ->dv_max_ppr_options = ppr_options; + if (targ->dv_last_ppr_options == 0) + targ->dv_last_ppr_options = ppr_options; + + cur_speed = aic_calc_speed(width, period, offset, AHC_SYNCRATE_MIN); + wide_speed = aic_calc_speed(MSG_EXT_WDTR_BUS_16_BIT, + targ->dv_next_wide_period, + MAX_OFFSET, + AHC_SYNCRATE_MIN); + narrow_speed = aic_calc_speed(MSG_EXT_WDTR_BUS_8_BIT, + targ->dv_next_narrow_period, + MAX_OFFSET, + AHC_SYNCRATE_MIN); + fallback_speed = aic_calc_speed(width, period+1, offset, + AHC_SYNCRATE_MIN); +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + printf("cur_speed= %d, wide_speed= %d, narrow_speed= %d, " + "fallback_speed= %d\n", cur_speed, wide_speed, + narrow_speed, fallback_speed); + } +#endif + + if (cur_speed > 160000) { + /* + * Paced/DT/IU_REQ only transfer speeds. All we + * can do is fallback in terms of syncrate. + */ + period++; + } else if (cur_speed > 80000) { + if ((ppr_options & MSG_EXT_PPR_IU_REQ) != 0) { + /* + * Try without IU_REQ as it may be confusing + * an expander. + */ + ppr_options &= ~MSG_EXT_PPR_IU_REQ; + } else { + /* + * Paced/DT only transfer speeds. All we + * can do is fallback in terms of syncrate. + */ + period++; + ppr_options = targ->dv_max_ppr_options; + } + } else if (cur_speed > 3300) { + + /* + * In this range we the following + * options ordered from highest to + * lowest desireability: + * + * o Wide/DT + * o Wide/non-DT + * o Narrow at a potentally higher sync rate. + * + * All modes are tested with and without IU_REQ + * set since using IUs may confuse an expander. + */ + if ((ppr_options & MSG_EXT_PPR_IU_REQ) != 0) { + + ppr_options &= ~MSG_EXT_PPR_IU_REQ; + } else if ((ppr_options & MSG_EXT_PPR_DT_REQ) != 0) { + /* + * Try going non-DT. + */ + ppr_options = targ->dv_max_ppr_options; + ppr_options &= ~MSG_EXT_PPR_DT_REQ; + } else if (targ->dv_last_ppr_options != 0) { + /* + * Try without QAS or any other PPR options. + * We may need a non-PPR message to work with + * an expander. We look at the "last PPR options" + * so we will perform this fallback even if the + * target responded to our PPR negotiation with + * no option bits set. + */ + ppr_options = 0; + } else if (width == MSG_EXT_WDTR_BUS_16_BIT) { + /* + * If the next narrow speed is greater than + * the next wide speed, fallback to narrow. + * Otherwise fallback to the next DT/Wide setting. + * The narrow async speed will always be smaller + * than the wide async speed, so handle this case + * specifically. + */ + ppr_options = targ->dv_max_ppr_options; + if (narrow_speed > fallback_speed + || period >= AHC_ASYNC_XFER_PERIOD) { + targ->dv_next_wide_period = period+1; + width = MSG_EXT_WDTR_BUS_8_BIT; + period = targ->dv_next_narrow_period; + } else { + period++; + } + } else if ((ahc->features & AHC_WIDE) != 0 + && targ->dv_max_width != 0 + && wide_speed >= fallback_speed + && (targ->dv_next_wide_period <= AHC_ASYNC_XFER_PERIOD + || period >= AHC_ASYNC_XFER_PERIOD)) { + + /* + * We are narrow. Try falling back + * to the next wide speed with + * all supported ppr options set. + */ + targ->dv_next_narrow_period = period+1; + width = MSG_EXT_WDTR_BUS_16_BIT; + period = targ->dv_next_wide_period; + ppr_options = targ->dv_max_ppr_options; + } else { + /* Only narrow fallback is allowed. */ + period++; + ppr_options = targ->dv_max_ppr_options; + } + } else { + ahc_unlock(ahc, &s); + return (-1); + } + offset = MAX_OFFSET; + syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, + AHC_SYNCRATE_DT); + ahc_set_width(ahc, devinfo, width, AHC_TRANS_GOAL, FALSE); + if (period == 0) { + period = 0; + offset = 0; + ppr_options = 0; + if (width == MSG_EXT_WDTR_BUS_8_BIT) + targ->dv_next_narrow_period = AHC_ASYNC_XFER_PERIOD; + else + targ->dv_next_wide_period = AHC_ASYNC_XFER_PERIOD; + } + ahc_set_syncrate(ahc, devinfo, syncrate, period, offset, + ppr_options, AHC_TRANS_GOAL, FALSE); + targ->dv_last_ppr_options = ppr_options; + ahc_unlock(ahc, &s); + return (0); +} + +static void +ahc_linux_dv_timeout(struct scsi_cmnd *cmd) +{ + struct ahc_softc *ahc; + struct scb *scb; + u_long flags; + + ahc = *((struct ahc_softc **)cmd->device->host->hostdata); + ahc_lock(ahc, &flags); + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) { + printf("%s: Timeout while doing DV command %x.\n", + ahc_name(ahc), cmd->cmnd[0]); + ahc_dump_card_state(ahc); + } +#endif + + /* + * Guard against "done race". No action is + * required if we just completed. + */ + if ((scb = (struct scb *)cmd->host_scribble) == NULL) { + ahc_unlock(ahc, &flags); + return; + } + + /* + * Command has not completed. Mark this + * SCB as having failing status prior to + * resetting the bus, so we get the correct + * error code. + */ + if ((scb->flags & SCB_SENSE) != 0) + ahc_set_transaction_status(scb, CAM_AUTOSENSE_FAIL); + else + ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT); + ahc_reset_channel(ahc, cmd->device->channel + 'A', /*initiate*/TRUE); + + /* + * Add a minimal bus settle delay for devices that are slow to + * respond after bus resets. + */ + ahc_linux_freeze_simq(ahc); + init_timer(&ahc->platform_data->reset_timer); + ahc->platform_data->reset_timer.data = (u_long)ahc; + ahc->platform_data->reset_timer.expires = jiffies + HZ / 2; + ahc->platform_data->reset_timer.function = + (ahc_linux_callback_t *)ahc_linux_release_simq; + add_timer(&ahc->platform_data->reset_timer); + if (ahc_linux_next_device_to_run(ahc) != NULL) + ahc_schedule_runq(ahc); + ahc_linux_run_complete_queue(ahc); + ahc_unlock(ahc, &flags); +} + +static void +ahc_linux_dv_complete(struct scsi_cmnd *cmd) +{ + struct ahc_softc *ahc; + + ahc = *((struct ahc_softc **)cmd->device->host->hostdata); + + /* Delete the DV timer before it goes off! */ + scsi_delete_timer(cmd); + +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_DV) + printf("%s:%d:%d: Command completed, status= 0x%x\n", + ahc_name(ahc), cmd->device->channel, + cmd->device->id, cmd->result); +#endif + + /* Wake up the state machine */ + up(&ahc->platform_data->dv_cmd_sem); +} + +static void +ahc_linux_generate_dv_pattern(struct ahc_linux_target *targ) +{ + uint16_t b; + u_int i; + u_int j; + + if (targ->dv_buffer != NULL) + free(targ->dv_buffer, M_DEVBUF); + targ->dv_buffer = malloc(targ->dv_echo_size, M_DEVBUF, M_WAITOK); + if (targ->dv_buffer1 != NULL) + free(targ->dv_buffer1, M_DEVBUF); + targ->dv_buffer1 = malloc(targ->dv_echo_size, M_DEVBUF, M_WAITOK); + + i = 0; + b = 0x0001; + for (j = 0 ; i < targ->dv_echo_size; j++) { + if (j < 32) { + /* + * 32bytes of sequential numbers. + */ + targ->dv_buffer[i++] = j & 0xff; + } else if (j < 48) { + /* + * 32bytes of repeating 0x0000, 0xffff. + */ + targ->dv_buffer[i++] = (j & 0x02) ? 0xff : 0x00; + } else if (j < 64) { + /* + * 32bytes of repeating 0x5555, 0xaaaa. + */ + targ->dv_buffer[i++] = (j & 0x02) ? 0xaa : 0x55; + } else { + /* + * Remaining buffer is filled with a repeating + * patter of: + * + * 0xffff + * ~0x0001 << shifted once in each loop. + */ + if (j & 0x02) { + if (j & 0x01) { + targ->dv_buffer[i++] = ~(b >> 8) & 0xff; + b <<= 1; + if (b == 0x0000) + b = 0x0001; + } else { + targ->dv_buffer[i++] = (~b & 0xff); + } + } else { + targ->dv_buffer[i++] = 0xff; + } + } + } +} + +static u_int +ahc_linux_user_tagdepth(struct ahc_softc *ahc, struct ahc_devinfo *devinfo) +{ + static int warned_user; + u_int tags; + + tags = 0; + if ((ahc->user_discenable & devinfo->target_mask) != 0) { + if (ahc->unit >= NUM_ELEMENTS(aic7xxx_tag_info)) { + if (warned_user == 0) { + + printf(KERN_WARNING +"aic7xxx: WARNING: Insufficient tag_info instances\n" +"aic7xxx: for installed controllers. Using defaults\n" +"aic7xxx: Please update the aic7xxx_tag_info array in\n" +"aic7xxx: the aic7xxx_osm..c source file.\n"); + warned_user++; + } + tags = AHC_MAX_QUEUE; + } else { + adapter_tag_info_t *tag_info; + + tag_info = &aic7xxx_tag_info[ahc->unit]; + tags = tag_info->tag_commands[devinfo->target_offset]; + if (tags > AHC_MAX_QUEUE) + tags = AHC_MAX_QUEUE; + } + } + return (tags); +} + +static u_int +ahc_linux_user_dv_setting(struct ahc_softc *ahc) +{ + static int warned_user; + int dv; + + if (ahc->unit >= NUM_ELEMENTS(aic7xxx_dv_settings)) { + if (warned_user == 0) { + + printf(KERN_WARNING +"aic7xxx: WARNING: Insufficient dv settings instances\n" +"aic7xxx: for installed controllers. Using defaults\n" +"aic7xxx: Please update the aic7xxx_dv_settings array\n" +"aic7xxx: in the aic7xxx_osm.c source file.\n"); + warned_user++; + } + dv = -1; + } else { + + dv = aic7xxx_dv_settings[ahc->unit]; + } + + if (dv < 0) { + u_long s; + + /* + * Apply the default. + */ + /* + * XXX - Enable DV on non-U160 controllers once it + * has been tested there. + */ + ahc_lock(ahc, &s); + dv = (ahc->features & AHC_DT); + if (ahc->seep_config != 0 + && ahc->seep_config->signature >= CFSIGNATURE2) + dv = (ahc->seep_config->adapter_control & CFENABLEDV); + ahc_unlock(ahc, &s); + } + return (dv); +} + +/* + * Determines the queue depth for a given device. + */ +static void +ahc_linux_device_queue_depth(struct ahc_softc *ahc, + struct ahc_linux_device *dev) +{ + struct ahc_devinfo devinfo; + u_int tags; + + ahc_compile_devinfo(&devinfo, + dev->target->channel == 0 + ? ahc->our_id : ahc->our_id_b, + dev->target->target, dev->lun, + dev->target->channel == 0 ? 'A' : 'B', + ROLE_INITIATOR); + tags = ahc_linux_user_tagdepth(ahc, &devinfo); + if (tags != 0 + && dev->scsi_device != NULL + && dev->scsi_device->tagged_supported != 0) { + + ahc_set_tags(ahc, &devinfo, AHC_QUEUE_TAGGED); + ahc_print_devinfo(ahc, &devinfo); + printf("Tagged Queuing enabled. Depth %d\n", tags); + } else { + ahc_set_tags(ahc, &devinfo, AHC_QUEUE_NONE); + } +} + +static void +ahc_linux_run_device_queue(struct ahc_softc *ahc, struct ahc_linux_device *dev) +{ + struct ahc_cmd *acmd; + struct scsi_cmnd *cmd; + struct scb *scb; + struct hardware_scb *hscb; + struct ahc_initiator_tinfo *tinfo; + struct ahc_tmode_tstate *tstate; + uint16_t mask; + + if ((dev->flags & AHC_DEV_ON_RUN_LIST) != 0) + panic("running device on run list"); + + while ((acmd = TAILQ_FIRST(&dev->busyq)) != NULL + && dev->openings > 0 && dev->qfrozen == 0) { + + /* + * Schedule us to run later. The only reason we are not + * running is because the whole controller Q is frozen. + */ + if (ahc->platform_data->qfrozen != 0 + && AHC_DV_SIMQ_FROZEN(ahc) == 0) { + TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, + dev, links); + dev->flags |= AHC_DEV_ON_RUN_LIST; + return; + } + /* + * Get an scb to use. + */ + if ((scb = ahc_get_scb(ahc)) == NULL) { + TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, + dev, links); + dev->flags |= AHC_DEV_ON_RUN_LIST; + ahc->flags |= AHC_RESOURCE_SHORTAGE; + return; + } + TAILQ_REMOVE(&dev->busyq, acmd, acmd_links.tqe); + cmd = &acmd_scsi_cmd(acmd); + scb->io_ctx = cmd; + scb->platform_data->dev = dev; + hscb = scb->hscb; + cmd->host_scribble = (char *)scb; + + /* + * Fill out basics of the HSCB. + */ + hscb->control = 0; + hscb->scsiid = BUILD_SCSIID(ahc, cmd); + hscb->lun = cmd->device->lun; + mask = SCB_GET_TARGET_MASK(ahc, scb); + tinfo = ahc_fetch_transinfo(ahc, SCB_GET_CHANNEL(ahc, scb), + SCB_GET_OUR_ID(scb), + SCB_GET_TARGET(ahc, scb), &tstate); + hscb->scsirate = tinfo->scsirate; + hscb->scsioffset = tinfo->curr.offset; + if ((tstate->ultraenb & mask) != 0) + hscb->control |= ULTRAENB; + + if ((ahc->user_discenable & mask) != 0) + hscb->control |= DISCENB; + + if (AHC_DV_CMD(cmd) != 0) + scb->flags |= SCB_SILENT; + + if ((tstate->auto_negotiate & mask) != 0) { + scb->flags |= SCB_AUTO_NEGOTIATE; + scb->hscb->control |= MK_MESSAGE; + } + + if ((dev->flags & (AHC_DEV_Q_TAGGED|AHC_DEV_Q_BASIC)) != 0) { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + int msg_bytes; + uint8_t tag_msgs[2]; + + msg_bytes = scsi_populate_tag_msg(cmd, tag_msgs); + if (msg_bytes && tag_msgs[0] != MSG_SIMPLE_TASK) { + hscb->control |= tag_msgs[0]; + if (tag_msgs[0] == MSG_ORDERED_TASK) + dev->commands_since_idle_or_otag = 0; + } else +#endif + if (dev->commands_since_idle_or_otag == AHC_OTAG_THRESH + && (dev->flags & AHC_DEV_Q_TAGGED) != 0) { + hscb->control |= MSG_ORDERED_TASK; + dev->commands_since_idle_or_otag = 0; + } else { + hscb->control |= MSG_SIMPLE_TASK; + } + } + + hscb->cdb_len = cmd->cmd_len; + if (hscb->cdb_len <= 12) { + memcpy(hscb->shared_data.cdb, cmd->cmnd, hscb->cdb_len); + } else { + memcpy(hscb->cdb32, cmd->cmnd, hscb->cdb_len); + scb->flags |= SCB_CDB32_PTR; + } + + scb->platform_data->xfer_len = 0; + ahc_set_residual(scb, 0); + ahc_set_sense_residual(scb, 0); + scb->sg_count = 0; + if (cmd->use_sg != 0) { + struct ahc_dma_seg *sg; + struct scatterlist *cur_seg; + struct scatterlist *end_seg; + int nseg; + + cur_seg = (struct scatterlist *)cmd->request_buffer; + nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg, + scsi_to_pci_dma_dir(cmd->sc_data_direction)); + end_seg = cur_seg + nseg; + /* Copy the segments into the SG list. */ + sg = scb->sg_list; + /* + * The sg_count may be larger than nseg if + * a transfer crosses a 32bit page. + */ + while (cur_seg < end_seg) { + dma_addr_t addr; + bus_size_t len; + int consumed; + + addr = sg_dma_address(cur_seg); + len = sg_dma_len(cur_seg); + consumed = ahc_linux_map_seg(ahc, scb, + sg, addr, len); + sg += consumed; + scb->sg_count += consumed; + cur_seg++; + } + sg--; + sg->len |= ahc_htole32(AHC_DMA_LAST_SEG); + + /* + * Reset the sg list pointer. + */ + scb->hscb->sgptr = + ahc_htole32(scb->sg_list_phys | SG_FULL_RESID); + + /* + * Copy the first SG into the "current" + * data pointer area. + */ + scb->hscb->dataptr = scb->sg_list->addr; + scb->hscb->datacnt = scb->sg_list->len; + } else if (cmd->request_bufflen != 0) { + struct ahc_dma_seg *sg; + dma_addr_t addr; + + sg = scb->sg_list; + addr = pci_map_single(ahc->dev_softc, + cmd->request_buffer, + cmd->request_bufflen, + scsi_to_pci_dma_dir(cmd->sc_data_direction)); + scb->platform_data->buf_busaddr = addr; + scb->sg_count = ahc_linux_map_seg(ahc, scb, + sg, addr, + cmd->request_bufflen); + sg->len |= ahc_htole32(AHC_DMA_LAST_SEG); + + /* + * Reset the sg list pointer. + */ + scb->hscb->sgptr = + ahc_htole32(scb->sg_list_phys | SG_FULL_RESID); + + /* + * Copy the first SG into the "current" + * data pointer area. + */ + scb->hscb->dataptr = sg->addr; + scb->hscb->datacnt = sg->len; + } else { + scb->hscb->sgptr = ahc_htole32(SG_LIST_NULL); + scb->hscb->dataptr = 0; + scb->hscb->datacnt = 0; + scb->sg_count = 0; + } + + ahc_sync_sglist(ahc, scb, BUS_DMASYNC_PREWRITE); + LIST_INSERT_HEAD(&ahc->pending_scbs, scb, pending_links); + dev->openings--; + dev->active++; + dev->commands_issued++; + if ((dev->flags & AHC_DEV_PERIODIC_OTAG) != 0) + dev->commands_since_idle_or_otag++; + + /* + * We only allow one untagged transaction + * per target in the initiator role unless + * we are storing a full busy target *lun* + * table in SCB space. + */ + if ((scb->hscb->control & (TARGET_SCB|TAG_ENB)) == 0 + && (ahc->features & AHC_SCB_BTT) == 0) { + struct scb_tailq *untagged_q; + int target_offset; + + target_offset = SCB_GET_TARGET_OFFSET(ahc, scb); + untagged_q = &(ahc->untagged_queues[target_offset]); + TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe); + scb->flags |= SCB_UNTAGGEDQ; + if (TAILQ_FIRST(untagged_q) != scb) + continue; + } + scb->flags |= SCB_ACTIVE; + ahc_queue_scb(ahc, scb); + } +} + +/* + * SCSI controller interrupt handler. + */ +irqreturn_t +ahc_linux_isr(int irq, void *dev_id, struct pt_regs * regs) +{ + struct ahc_softc *ahc; + u_long flags; + int ours; + + ahc = (struct ahc_softc *) dev_id; + ahc_lock(ahc, &flags); + ours = ahc_intr(ahc); + if (ahc_linux_next_device_to_run(ahc) != NULL) + ahc_schedule_runq(ahc); + ahc_linux_run_complete_queue(ahc); + ahc_unlock(ahc, &flags); + return IRQ_RETVAL(ours); +} + +void +ahc_platform_flushwork(struct ahc_softc *ahc) +{ + + while (ahc_linux_run_complete_queue(ahc) != NULL) + ; +} + +static struct ahc_linux_target* +ahc_linux_alloc_target(struct ahc_softc *ahc, u_int channel, u_int target) +{ + struct ahc_linux_target *targ; + u_int target_offset; + + target_offset = target; + if (channel != 0) + target_offset += 8; + + targ = malloc(sizeof(*targ), M_DEVBUG, M_NOWAIT); + if (targ == NULL) + return (NULL); + memset(targ, 0, sizeof(*targ)); + targ->channel = channel; + targ->target = target; + targ->ahc = ahc; + targ->flags = AHC_DV_REQUIRED; + ahc->platform_data->targets[target_offset] = targ; + return (targ); +} + +static void +ahc_linux_free_target(struct ahc_softc *ahc, struct ahc_linux_target *targ) +{ + struct ahc_devinfo devinfo; + struct ahc_initiator_tinfo *tinfo; + struct ahc_tmode_tstate *tstate; + u_int our_id; + u_int target_offset; + char channel; + + /* + * Force a negotiation to async/narrow on any + * future command to this device unless a bus + * reset occurs between now and that command. + */ + channel = 'A' + targ->channel; + our_id = ahc->our_id; + target_offset = targ->target; + if (targ->channel != 0) { + target_offset += 8; + our_id = ahc->our_id_b; + } + tinfo = ahc_fetch_transinfo(ahc, channel, our_id, + targ->target, &tstate); + ahc_compile_devinfo(&devinfo, our_id, targ->target, CAM_LUN_WILDCARD, + channel, ROLE_INITIATOR); + ahc_set_syncrate(ahc, &devinfo, NULL, 0, 0, 0, + AHC_TRANS_GOAL, /*paused*/FALSE); + ahc_set_width(ahc, &devinfo, MSG_EXT_WDTR_BUS_8_BIT, + AHC_TRANS_GOAL, /*paused*/FALSE); + ahc_update_neg_request(ahc, &devinfo, tstate, tinfo, AHC_NEG_ALWAYS); + ahc->platform_data->targets[target_offset] = NULL; + if (targ->inq_data != NULL) + free(targ->inq_data, M_DEVBUF); + if (targ->dv_buffer != NULL) + free(targ->dv_buffer, M_DEVBUF); + if (targ->dv_buffer1 != NULL) + free(targ->dv_buffer1, M_DEVBUF); + free(targ, M_DEVBUF); +} + +static struct ahc_linux_device* +ahc_linux_alloc_device(struct ahc_softc *ahc, + struct ahc_linux_target *targ, u_int lun) +{ + struct ahc_linux_device *dev; + + dev = malloc(sizeof(*dev), M_DEVBUG, M_NOWAIT); + if (dev == NULL) + return (NULL); + memset(dev, 0, sizeof(*dev)); + init_timer(&dev->timer); + TAILQ_INIT(&dev->busyq); + dev->flags = AHC_DEV_UNCONFIGURED; + dev->lun = lun; + dev->target = targ; + + /* + * We start out life using untagged + * transactions of which we allow one. + */ + dev->openings = 1; + + /* + * Set maxtags to 0. This will be changed if we + * later determine that we are dealing with + * a tagged queuing capable device. + */ + dev->maxtags = 0; + + targ->refcount++; + targ->devices[lun] = dev; + return (dev); +} + +static void +__ahc_linux_free_device(struct ahc_softc *ahc, struct ahc_linux_device *dev) +{ + struct ahc_linux_target *targ; + + targ = dev->target; + targ->devices[dev->lun] = NULL; + free(dev, M_DEVBUF); + targ->refcount--; + if (targ->refcount == 0 + && (targ->flags & AHC_DV_REQUIRED) == 0) + ahc_linux_free_target(ahc, targ); +} + +static void +ahc_linux_free_device(struct ahc_softc *ahc, struct ahc_linux_device *dev) +{ + del_timer_sync(&dev->timer); + __ahc_linux_free_device(ahc, dev); +} + +void +ahc_send_async(struct ahc_softc *ahc, char channel, + u_int target, u_int lun, ac_code code, void *arg) +{ + switch (code) { + case AC_TRANSFER_NEG: + { + char buf[80]; + struct ahc_linux_target *targ; + struct info_str info; + struct ahc_initiator_tinfo *tinfo; + struct ahc_tmode_tstate *tstate; + int target_offset; + + info.buffer = buf; + info.length = sizeof(buf); + info.offset = 0; + info.pos = 0; + tinfo = ahc_fetch_transinfo(ahc, channel, + channel == 'A' ? ahc->our_id + : ahc->our_id_b, + target, &tstate); + + /* + * Don't bother reporting results while + * negotiations are still pending. + */ + if (tinfo->curr.period != tinfo->goal.period + || tinfo->curr.width != tinfo->goal.width + || tinfo->curr.offset != tinfo->goal.offset + || tinfo->curr.ppr_options != tinfo->goal.ppr_options) + if (bootverbose == 0) + break; + + /* + * Don't bother reporting results that + * are identical to those last reported. + */ + target_offset = target; + if (channel == 'B') + target_offset += 8; + targ = ahc->platform_data->targets[target_offset]; + if (targ == NULL) + break; + if (tinfo->curr.period == targ->last_tinfo.period + && tinfo->curr.width == targ->last_tinfo.width + && tinfo->curr.offset == targ->last_tinfo.offset + && tinfo->curr.ppr_options == targ->last_tinfo.ppr_options) + if (bootverbose == 0) + break; + + targ->last_tinfo.period = tinfo->curr.period; + targ->last_tinfo.width = tinfo->curr.width; + targ->last_tinfo.offset = tinfo->curr.offset; + targ->last_tinfo.ppr_options = tinfo->curr.ppr_options; + + printf("(%s:%c:", ahc_name(ahc), channel); + if (target == CAM_TARGET_WILDCARD) + printf("*): "); + else + printf("%d): ", target); + ahc_format_transinfo(&info, &tinfo->curr); + if (info.pos < info.length) + *info.buffer = '\0'; + else + buf[info.length - 1] = '\0'; + printf("%s", buf); + break; + } + case AC_SENT_BDR: + { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + WARN_ON(lun != CAM_LUN_WILDCARD); + scsi_report_device_reset(ahc->platform_data->host, + channel - 'A', target); +#else + Scsi_Device *scsi_dev; + + /* + * Find the SCSI device associated with this + * request and indicate that a UA is expected. + */ + for (scsi_dev = ahc->platform_data->host->host_queue; + scsi_dev != NULL; scsi_dev = scsi_dev->next) { + if (channel - 'A' == scsi_dev->channel + && target == scsi_dev->id + && (lun == CAM_LUN_WILDCARD + || lun == scsi_dev->lun)) { + scsi_dev->was_reset = 1; + scsi_dev->expecting_cc_ua = 1; + } + } +#endif + break; + } + case AC_BUS_RESET: + if (ahc->platform_data->host != NULL) { + scsi_report_bus_reset(ahc->platform_data->host, + channel - 'A'); + } + break; + default: + panic("ahc_send_async: Unexpected async event"); + } +} + +/* + * Calls the higher level scsi done function and frees the scb. + */ +void +ahc_done(struct ahc_softc *ahc, struct scb *scb) +{ + Scsi_Cmnd *cmd; + struct ahc_linux_device *dev; + + LIST_REMOVE(scb, pending_links); + if ((scb->flags & SCB_UNTAGGEDQ) != 0) { + struct scb_tailq *untagged_q; + int target_offset; + + target_offset = SCB_GET_TARGET_OFFSET(ahc, scb); + untagged_q = &(ahc->untagged_queues[target_offset]); + TAILQ_REMOVE(untagged_q, scb, links.tqe); + ahc_run_untagged_queue(ahc, untagged_q); + } + + if ((scb->flags & SCB_ACTIVE) == 0) { + printf("SCB %d done'd twice\n", scb->hscb->tag); + ahc_dump_card_state(ahc); + panic("Stopping for safety"); + } + cmd = scb->io_ctx; + dev = scb->platform_data->dev; + dev->active--; + dev->openings++; + if ((cmd->result & (CAM_DEV_QFRZN << 16)) != 0) { + cmd->result &= ~(CAM_DEV_QFRZN << 16); + dev->qfrozen--; + } + ahc_linux_unmap_scb(ahc, scb); + + /* + * Guard against stale sense data. + * The Linux mid-layer assumes that sense + * was retrieved anytime the first byte of + * the sense buffer looks "sane". + */ + cmd->sense_buffer[0] = 0; + if (ahc_get_transaction_status(scb) == CAM_REQ_INPROG) { + uint32_t amount_xferred; + + amount_xferred = + ahc_get_transfer_length(scb) - ahc_get_residual(scb); + if ((scb->flags & SCB_TRANSMISSION_ERROR) != 0) { +#ifdef AHC_DEBUG + if ((ahc_debug & AHC_SHOW_MISC) != 0) { + ahc_print_path(ahc, scb); + printf("Set CAM_UNCOR_PARITY\n"); + } +#endif + ahc_set_transaction_status(scb, CAM_UNCOR_PARITY); +#ifdef AHC_REPORT_UNDERFLOWS + /* + * This code is disabled by default as some + * clients of the SCSI system do not properly + * initialize the underflow parameter. This + * results in spurious termination of commands + * that complete as expected (e.g. underflow is + * allowed as command can return variable amounts + * of data. + */ + } else if (amount_xferred < scb->io_ctx->underflow) { + u_int i; + + ahc_print_path(ahc, scb); + printf("CDB:"); + for (i = 0; i < scb->io_ctx->cmd_len; i++) + printf(" 0x%x", scb->io_ctx->cmnd[i]); + printf("\n"); + ahc_print_path(ahc, scb); + printf("Saw underflow (%ld of %ld bytes). " + "Treated as error\n", + ahc_get_residual(scb), + ahc_get_transfer_length(scb)); + ahc_set_transaction_status(scb, CAM_DATA_RUN_ERR); +#endif + } else { + ahc_set_transaction_status(scb, CAM_REQ_CMP); + } + } else if (ahc_get_transaction_status(scb) == CAM_SCSI_STATUS_ERROR) { + ahc_linux_handle_scsi_status(ahc, dev, scb); + } else if (ahc_get_transaction_status(scb) == CAM_SEL_TIMEOUT) { + dev->flags |= AHC_DEV_UNCONFIGURED; + if (AHC_DV_CMD(cmd) == FALSE) + dev->target->flags &= ~AHC_DV_REQUIRED; + } + /* + * Start DV for devices that require it assuming the first command + * sent does not result in a selection timeout. + */ + if (ahc_get_transaction_status(scb) != CAM_SEL_TIMEOUT + && (dev->target->flags & AHC_DV_REQUIRED) != 0) + ahc_linux_start_dv(ahc); + + if (dev->openings == 1 + && ahc_get_transaction_status(scb) == CAM_REQ_CMP + && ahc_get_scsi_status(scb) != SCSI_STATUS_QUEUE_FULL) + dev->tag_success_count++; + /* + * Some devices deal with temporary internal resource + * shortages by returning queue full. When the queue + * full occurrs, we throttle back. Slowly try to get + * back to our previous queue depth. + */ + if ((dev->openings + dev->active) < dev->maxtags + && dev->tag_success_count > AHC_TAG_SUCCESS_INTERVAL) { + dev->tag_success_count = 0; + dev->openings++; + } + + if (dev->active == 0) + dev->commands_since_idle_or_otag = 0; + + if (TAILQ_EMPTY(&dev->busyq)) { + if ((dev->flags & AHC_DEV_UNCONFIGURED) != 0 + && dev->active == 0 + && (dev->flags & AHC_DEV_TIMER_ACTIVE) == 0) + ahc_linux_free_device(ahc, dev); + } else if ((dev->flags & AHC_DEV_ON_RUN_LIST) == 0) { + TAILQ_INSERT_TAIL(&ahc->platform_data->device_runq, dev, links); + dev->flags |= AHC_DEV_ON_RUN_LIST; + } + + if ((scb->flags & SCB_RECOVERY_SCB) != 0) { + printf("Recovery SCB completes\n"); + if (ahc_get_transaction_status(scb) == CAM_BDR_SENT + || ahc_get_transaction_status(scb) == CAM_REQ_ABORTED) + ahc_set_transaction_status(scb, CAM_CMD_TIMEOUT); + if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) { + ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE; + up(&ahc->platform_data->eh_sem); + } + } + + ahc_free_scb(ahc, scb); + ahc_linux_queue_cmd_complete(ahc, cmd); + + if ((ahc->platform_data->flags & AHC_DV_WAIT_SIMQ_EMPTY) != 0 + && LIST_FIRST(&ahc->pending_scbs) == NULL) { + ahc->platform_data->flags &= ~AHC_DV_WAIT_SIMQ_EMPTY; + up(&ahc->platform_data->dv_sem); + } + +} + +static void +ahc_linux_handle_scsi_status(struct ahc_softc *ahc, + struct ahc_linux_device *dev, struct scb *scb) +{ + struct ahc_devinfo devinfo; + + ahc_compile_devinfo(&devinfo, + ahc->our_id, + dev->target->target, dev->lun, + dev->target->channel == 0 ? 'A' : 'B', + ROLE_INITIATOR); + + /* + * We don't currently trust the mid-layer to + * properly deal with queue full or busy. So, + * when one occurs, we tell the mid-layer to + * unconditionally requeue the command to us + * so that we can retry it ourselves. We also + * implement our own throttling mechanism so + * we don't clobber the device with too many + * commands. + */ + switch (ahc_get_scsi_status(scb)) { + default: + break; + case SCSI_STATUS_CHECK_COND: + case SCSI_STATUS_CMD_TERMINATED: + { + Scsi_Cmnd *cmd; + + /* + * Copy sense information to the OS's cmd + * structure if it is available. + */ + cmd = scb->io_ctx; + if (scb->flags & SCB_SENSE) { + u_int sense_size; + + sense_size = MIN(sizeof(struct scsi_sense_data) + - ahc_get_sense_residual(scb), + sizeof(cmd->sense_buffer)); + memcpy(cmd->sense_buffer, + ahc_get_sense_buf(ahc, scb), sense_size); + if (sense_size < sizeof(cmd->sense_buffer)) + memset(&cmd->sense_buffer[sense_size], 0, + sizeof(cmd->sense_buffer) - sense_size); + cmd->result |= (DRIVER_SENSE << 24); +#ifdef AHC_DEBUG + if (ahc_debug & AHC_SHOW_SENSE) { + int i; + + printf("Copied %d bytes of sense data:", + sense_size); + for (i = 0; i < sense_size; i++) { + if ((i & 0xF) == 0) + printf("\n"); + printf("0x%x ", cmd->sense_buffer[i]); + } + printf("\n"); + } +#endif + } + break; + } + case SCSI_STATUS_QUEUE_FULL: + { + /* + * By the time the core driver has returned this + * command, all other commands that were queued + * to us but not the device have been returned. + * This ensures that dev->active is equal to + * the number of commands actually queued to + * the device. + */ + dev->tag_success_count = 0; + if (dev->active != 0) { + /* + * Drop our opening count to the number + * of commands currently outstanding. + */ + dev->openings = 0; +/* + ahc_print_path(ahc, scb); + printf("Dropping tag count to %d\n", dev->active); + */ + if (dev->active == dev->tags_on_last_queuefull) { + + dev->last_queuefull_same_count++; + /* + * If we repeatedly see a queue full + * at the same queue depth, this + * device has a fixed number of tag + * slots. Lock in this tag depth + * so we stop seeing queue fulls from + * this device. + */ + if (dev->last_queuefull_same_count + == AHC_LOCK_TAGS_COUNT) { + dev->maxtags = dev->active; + ahc_print_path(ahc, scb); + printf("Locking max tag count at %d\n", + dev->active); + } + } else { + dev->tags_on_last_queuefull = dev->active; + dev->last_queuefull_same_count = 0; + } + ahc_set_transaction_status(scb, CAM_REQUEUE_REQ); + ahc_set_scsi_status(scb, SCSI_STATUS_OK); + ahc_platform_set_tags(ahc, &devinfo, + (dev->flags & AHC_DEV_Q_BASIC) + ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED); + break; + } + /* + * Drop down to a single opening, and treat this + * as if the target returned BUSY SCSI status. + */ + dev->openings = 1; + ahc_set_scsi_status(scb, SCSI_STATUS_BUSY); + ahc_platform_set_tags(ahc, &devinfo, + (dev->flags & AHC_DEV_Q_BASIC) + ? AHC_QUEUE_BASIC : AHC_QUEUE_TAGGED); + /* FALLTHROUGH */ + } + case SCSI_STATUS_BUSY: + { + /* + * Set a short timer to defer sending commands for + * a bit since Linux will not delay in this case. + */ + if ((dev->flags & AHC_DEV_TIMER_ACTIVE) != 0) { + printf("%s:%c:%d: Device Timer still active during " + "busy processing\n", ahc_name(ahc), + dev->target->channel, dev->target->target); + break; + } + dev->flags |= AHC_DEV_TIMER_ACTIVE; + dev->qfrozen++; + init_timer(&dev->timer); + dev->timer.data = (u_long)dev; + dev->timer.expires = jiffies + (HZ/2); + dev->timer.function = ahc_linux_dev_timed_unfreeze; + add_timer(&dev->timer); + break; + } + } +} + +static void +ahc_linux_queue_cmd_complete(struct ahc_softc *ahc, Scsi_Cmnd *cmd) +{ + /* + * Typically, the complete queue has very few entries + * queued to it before the queue is emptied by + * ahc_linux_run_complete_queue, so sorting the entries + * by generation number should be inexpensive. + * We perform the sort so that commands that complete + * with an error are retuned in the order origionally + * queued to the controller so that any subsequent retries + * are performed in order. The underlying ahc routines do + * not guarantee the order that aborted commands will be + * returned to us. + */ + struct ahc_completeq *completeq; + struct ahc_cmd *list_cmd; + struct ahc_cmd *acmd; + + /* + * Map CAM error codes into Linux Error codes. We + * avoid the conversion so that the DV code has the + * full error information available when making + * state change decisions. + */ + if (AHC_DV_CMD(cmd) == FALSE) { + u_int new_status; + + switch (ahc_cmd_get_transaction_status(cmd)) { + case CAM_REQ_INPROG: + case CAM_REQ_CMP: + case CAM_SCSI_STATUS_ERROR: + new_status = DID_OK; + break; + case CAM_REQ_ABORTED: + new_status = DID_ABORT; + break; + case CAM_BUSY: + new_status = DID_BUS_BUSY; + break; + case CAM_REQ_INVALID: + case CAM_PATH_INVALID: + new_status = DID_BAD_TARGET; + break; + case CAM_SEL_TIMEOUT: + new_status = DID_NO_CONNECT; + break; + case CAM_SCSI_BUS_RESET: + case CAM_BDR_SENT: + new_status = DID_RESET; + break; + case CAM_UNCOR_PARITY: + new_status = DID_PARITY; + break; + case CAM_CMD_TIMEOUT: + new_status = DID_TIME_OUT; + break; + case CAM_UA_ABORT: + case CAM_REQ_CMP_ERR: + case CAM_AUTOSENSE_FAIL: + case CAM_NO_HBA: + case CAM_DATA_RUN_ERR: + case CAM_UNEXP_BUSFREE: + case CAM_SEQUENCE_FAIL: + case CAM_CCB_LEN_ERR: + case CAM_PROVIDE_FAIL: + case CAM_REQ_TERMIO: + case CAM_UNREC_HBA_ERROR: + case CAM_REQ_TOO_BIG: + new_status = DID_ERROR; + break; + case CAM_REQUEUE_REQ: + /* + * If we want the request requeued, make sure there + * are sufficent retries. In the old scsi error code, + * we used to be able to specify a result code that + * bypassed the retry count. Now we must use this + * hack. We also "fake" a check condition with + * a sense code of ABORTED COMMAND. This seems to + * evoke a retry even if this command is being sent + * via the eh thread. Ick! Ick! Ick! + */ + if (cmd->retries > 0) + cmd->retries--; + new_status = DID_OK; + ahc_cmd_set_scsi_status(cmd, SCSI_STATUS_CHECK_COND); + cmd->result |= (DRIVER_SENSE << 24); + memset(cmd->sense_buffer, 0, + sizeof(cmd->sense_buffer)); + cmd->sense_buffer[0] = SSD_ERRCODE_VALID + | SSD_CURRENT_ERROR; + cmd->sense_buffer[2] = SSD_KEY_ABORTED_COMMAND; + break; + default: + /* We should never get here */ + new_status = DID_ERROR; + break; + } + + ahc_cmd_set_transaction_status(cmd, new_status); + } + + completeq = &ahc->platform_data->completeq; + list_cmd = TAILQ_FIRST(completeq); + acmd = (struct ahc_cmd *)cmd; + while (list_cmd != NULL + && acmd_scsi_cmd(list_cmd).serial_number + < acmd_scsi_cmd(acmd).serial_number) + list_cmd = TAILQ_NEXT(list_cmd, acmd_links.tqe); + if (list_cmd != NULL) + TAILQ_INSERT_BEFORE(list_cmd, acmd, acmd_links.tqe); + else + TAILQ_INSERT_TAIL(completeq, acmd, acmd_links.tqe); +} + +static void +ahc_linux_filter_inquiry(struct ahc_softc *ahc, struct ahc_devinfo *devinfo) +{ + struct scsi_inquiry_data *sid; + struct ahc_initiator_tinfo *tinfo; + struct ahc_transinfo *user; + struct ahc_transinfo *goal; + struct ahc_transinfo *curr; + struct ahc_tmode_tstate *tstate; + struct ahc_syncrate *syncrate; + struct ahc_linux_device *dev; + u_int maxsync; + u_int width; + u_int period; + u_int offset; + u_int ppr_options; + u_int trans_version; + u_int prot_version; + + /* + * Determine if this lun actually exists. If so, + * hold on to its corresponding device structure. + * If not, make sure we release the device and + * don't bother processing the rest of this inquiry + * command. + */ + dev = ahc_linux_get_device(ahc, devinfo->channel - 'A', + devinfo->target, devinfo->lun, + /*alloc*/TRUE); + + sid = (struct scsi_inquiry_data *)dev->target->inq_data; + if (SID_QUAL(sid) == SID_QUAL_LU_CONNECTED) { + + dev->flags &= ~AHC_DEV_UNCONFIGURED; + } else { + dev->flags |= AHC_DEV_UNCONFIGURED; + return; + } + + /* + * Update our notion of this device's transfer + * negotiation capabilities. + */ + tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, + devinfo->our_scsiid, + devinfo->target, &tstate); + user = &tinfo->user; + goal = &tinfo->goal; + curr = &tinfo->curr; + width = user->width; + period = user->period; + offset = user->offset; + ppr_options = user->ppr_options; + trans_version = user->transport_version; + prot_version = MIN(user->protocol_version, SID_ANSI_REV(sid)); + + /* + * Only attempt SPI3/4 once we've verified that + * the device claims to support SPI3/4 features. + */ + if (prot_version < SCSI_REV_2) + trans_version = SID_ANSI_REV(sid); + else + trans_version = SCSI_REV_2; + + if ((sid->flags & SID_WBus16) == 0) + width = MSG_EXT_WDTR_BUS_8_BIT; + if ((sid->flags & SID_Sync) == 0) { + period = 0; + offset = 0; + ppr_options = 0; + } + if ((sid->spi3data & SID_SPI_QAS) == 0) + ppr_options &= ~MSG_EXT_PPR_QAS_REQ; + if ((sid->spi3data & SID_SPI_CLOCK_DT) == 0) + ppr_options &= MSG_EXT_PPR_QAS_REQ; + if ((sid->spi3data & SID_SPI_IUS) == 0) + ppr_options &= (MSG_EXT_PPR_DT_REQ + | MSG_EXT_PPR_QAS_REQ); + + if (prot_version > SCSI_REV_2 + && ppr_options != 0) + trans_version = user->transport_version; + + ahc_validate_width(ahc, /*tinfo limit*/NULL, &width, ROLE_UNKNOWN); + if ((ahc->features & AHC_ULTRA2) != 0) + maxsync = AHC_SYNCRATE_DT; + else if ((ahc->features & AHC_ULTRA) != 0) + maxsync = AHC_SYNCRATE_ULTRA; + else + maxsync = AHC_SYNCRATE_FAST; + + syncrate = ahc_find_syncrate(ahc, &period, &ppr_options, maxsync); + ahc_validate_offset(ahc, /*tinfo limit*/NULL, syncrate, + &offset, width, ROLE_UNKNOWN); + if (offset == 0 || period == 0) { + period = 0; + offset = 0; + ppr_options = 0; + } + /* Apply our filtered user settings. */ + curr->transport_version = trans_version; + curr->protocol_version = prot_version; + ahc_set_width(ahc, devinfo, width, AHC_TRANS_GOAL, /*paused*/FALSE); + ahc_set_syncrate(ahc, devinfo, syncrate, period, + offset, ppr_options, AHC_TRANS_GOAL, + /*paused*/FALSE); +} + +static void +ahc_linux_sem_timeout(u_long arg) +{ + struct ahc_softc *ahc; + u_long s; + + ahc = (struct ahc_softc *)arg; + + ahc_lock(ahc, &s); + if ((ahc->platform_data->flags & AHC_UP_EH_SEMAPHORE) != 0) { + ahc->platform_data->flags &= ~AHC_UP_EH_SEMAPHORE; + up(&ahc->platform_data->eh_sem); + } + ahc_unlock(ahc, &s); +} + +static void +ahc_linux_freeze_simq(struct ahc_softc *ahc) +{ + ahc->platform_data->qfrozen++; + if (ahc->platform_data->qfrozen == 1) { + scsi_block_requests(ahc->platform_data->host); + + /* XXX What about Twin channels? */ + ahc_platform_abort_scbs(ahc, CAM_TARGET_WILDCARD, ALL_CHANNELS, + CAM_LUN_WILDCARD, SCB_LIST_NULL, + ROLE_INITIATOR, CAM_REQUEUE_REQ); + } +} + +static void +ahc_linux_release_simq(u_long arg) +{ + struct ahc_softc *ahc; + u_long s; + int unblock_reqs; + + ahc = (struct ahc_softc *)arg; + + unblock_reqs = 0; + ahc_lock(ahc, &s); + if (ahc->platform_data->qfrozen > 0) + ahc->platform_data->qfrozen--; + if (ahc->platform_data->qfrozen == 0) + unblock_reqs = 1; + if (AHC_DV_SIMQ_FROZEN(ahc) + && ((ahc->platform_data->flags & AHC_DV_WAIT_SIMQ_RELEASE) != 0)) { + ahc->platform_data->flags &= ~AHC_DV_WAIT_SIMQ_RELEASE; + up(&ahc->platform_data->dv_sem); + } + ahc_schedule_runq(ahc); + ahc_unlock(ahc, &s); + /* + * There is still a race here. The mid-layer + * should keep its own freeze count and use + * a bottom half handler to run the queues + * so we can unblock with our own lock held. + */ + if (unblock_reqs) + scsi_unblock_requests(ahc->platform_data->host); +} + +static void +ahc_linux_dev_timed_unfreeze(u_long arg) +{ + struct ahc_linux_device *dev; + struct ahc_softc *ahc; + u_long s; + + dev = (struct ahc_linux_device *)arg; + ahc = dev->target->ahc; + ahc_lock(ahc, &s); + dev->flags &= ~AHC_DEV_TIMER_ACTIVE; + if (dev->qfrozen > 0) + dev->qfrozen--; + if (dev->qfrozen == 0 + && (dev->flags & AHC_DEV_ON_RUN_LIST) == 0) + ahc_linux_run_device_queue(ahc, dev); + if (TAILQ_EMPTY(&dev->busyq) + && dev->active == 0) + __ahc_linux_free_device(ahc, dev); + ahc_unlock(ahc, &s); +} + +static int +ahc_linux_queue_recovery_cmd(Scsi_Cmnd *cmd, scb_flag flag) +{ + struct ahc_softc *ahc; + struct ahc_cmd *acmd; + struct ahc_cmd *list_acmd; + struct ahc_linux_device *dev; + struct scb *pending_scb; + u_long s; + u_int saved_scbptr; + u_int active_scb_index; + u_int last_phase; + u_int saved_scsiid; + u_int cdb_byte; + int retval; + int was_paused; + int paused; + int wait; + int disconnected; + + pending_scb = NULL; + paused = FALSE; + wait = FALSE; + ahc = *(struct ahc_softc **)cmd->device->host->hostdata; + acmd = (struct ahc_cmd *)cmd; + + printf("%s:%d:%d:%d: Attempting to queue a%s message\n", + ahc_name(ahc), cmd->device->channel, + cmd->device->id, cmd->device->lun, + flag == SCB_ABORT ? "n ABORT" : " TARGET RESET"); + + printf("CDB:"); + for (cdb_byte = 0; cdb_byte < cmd->cmd_len; cdb_byte++) + printf(" 0x%x", cmd->cmnd[cdb_byte]); + printf("\n"); + + /* + * In all versions of Linux, we have to work around + * a major flaw in how the mid-layer is locked down + * if we are to sleep successfully in our error handler + * while allowing our interrupt handler to run. Since + * the midlayer acquires either the io_request_lock or + * our lock prior to calling us, we must use the + * spin_unlock_irq() method for unlocking our lock. + * This will force interrupts to be enabled on the + * current CPU. Since the EH thread should not have + * been running with CPU interrupts disabled other than + * by acquiring either the io_request_lock or our own + * lock, this *should* be safe. + */ + ahc_midlayer_entrypoint_lock(ahc, &s); + + /* + * First determine if we currently own this command. + * Start by searching the device queue. If not found + * there, check the pending_scb list. If not found + * at all, and the system wanted us to just abort the + * command, return success. + */ + dev = ahc_linux_get_device(ahc, cmd->device->channel, cmd->device->id, + cmd->device->lun, /*alloc*/FALSE); + + if (dev == NULL) { + /* + * No target device for this command exists, + * so we must not still own the command. + */ + printf("%s:%d:%d:%d: Is not an active device\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + retval = SUCCESS; + goto no_cmd; + } + + TAILQ_FOREACH(list_acmd, &dev->busyq, acmd_links.tqe) { + if (list_acmd == acmd) + break; + } + + if (list_acmd != NULL) { + printf("%s:%d:%d:%d: Command found on device queue\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + if (flag == SCB_ABORT) { + TAILQ_REMOVE(&dev->busyq, list_acmd, acmd_links.tqe); + cmd->result = DID_ABORT << 16; + ahc_linux_queue_cmd_complete(ahc, cmd); + retval = SUCCESS; + goto done; + } + } + + if ((dev->flags & (AHC_DEV_Q_BASIC|AHC_DEV_Q_TAGGED)) == 0 + && ahc_search_untagged_queues(ahc, cmd, cmd->device->id, + cmd->device->channel + 'A', + cmd->device->lun, + CAM_REQ_ABORTED, SEARCH_COMPLETE) != 0) { + printf("%s:%d:%d:%d: Command found on untagged queue\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + retval = SUCCESS; + goto done; + } + + /* + * See if we can find a matching cmd in the pending list. + */ + LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) { + if (pending_scb->io_ctx == cmd) + break; + } + + if (pending_scb == NULL && flag == SCB_DEVICE_RESET) { + + /* Any SCB for this device will do for a target reset */ + LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) { + if (ahc_match_scb(ahc, pending_scb, cmd->device->id, + cmd->device->channel + 'A', + CAM_LUN_WILDCARD, + SCB_LIST_NULL, ROLE_INITIATOR) == 0) + break; + } + } + + if (pending_scb == NULL) { + printf("%s:%d:%d:%d: Command not found\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + goto no_cmd; + } + + if ((pending_scb->flags & SCB_RECOVERY_SCB) != 0) { + /* + * We can't queue two recovery actions using the same SCB + */ + retval = FAILED; + goto done; + } + + /* + * Ensure that the card doesn't do anything + * behind our back and that we didn't "just" miss + * an interrupt that would affect this cmd. + */ + was_paused = ahc_is_paused(ahc); + ahc_pause_and_flushwork(ahc); + paused = TRUE; + + if ((pending_scb->flags & SCB_ACTIVE) == 0) { + printf("%s:%d:%d:%d: Command already completed\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + goto no_cmd; + } + + printf("%s: At time of recovery, card was %spaused\n", + ahc_name(ahc), was_paused ? "" : "not "); + ahc_dump_card_state(ahc); + + disconnected = TRUE; + if (flag == SCB_ABORT) { + if (ahc_search_qinfifo(ahc, cmd->device->id, + cmd->device->channel + 'A', + cmd->device->lun, + pending_scb->hscb->tag, + ROLE_INITIATOR, CAM_REQ_ABORTED, + SEARCH_COMPLETE) > 0) { + printf("%s:%d:%d:%d: Cmd aborted from QINFIFO\n", + ahc_name(ahc), cmd->device->channel, + cmd->device->id, cmd->device->lun); + retval = SUCCESS; + goto done; + } + } else if (ahc_search_qinfifo(ahc, cmd->device->id, + cmd->device->channel + 'A', + cmd->device->lun, pending_scb->hscb->tag, + ROLE_INITIATOR, /*status*/0, + SEARCH_COUNT) > 0) { + disconnected = FALSE; + } + + if (disconnected && (ahc_inb(ahc, SEQ_FLAGS) & NOT_IDENTIFIED) == 0) { + struct scb *bus_scb; + + bus_scb = ahc_lookup_scb(ahc, ahc_inb(ahc, SCB_TAG)); + if (bus_scb == pending_scb) + disconnected = FALSE; + else if (flag != SCB_ABORT + && ahc_inb(ahc, SAVED_SCSIID) == pending_scb->hscb->scsiid + && ahc_inb(ahc, SAVED_LUN) == SCB_GET_LUN(pending_scb)) + disconnected = FALSE; + } + + /* + * At this point, pending_scb is the scb associated with the + * passed in command. That command is currently active on the + * bus, is in the disconnected state, or we're hoping to find + * a command for the same target active on the bus to abuse to + * send a BDR. Queue the appropriate message based on which of + * these states we are in. + */ + last_phase = ahc_inb(ahc, LASTPHASE); + saved_scbptr = ahc_inb(ahc, SCBPTR); + active_scb_index = ahc_inb(ahc, SCB_TAG); + saved_scsiid = ahc_inb(ahc, SAVED_SCSIID); + if (last_phase != P_BUSFREE + && (pending_scb->hscb->tag == active_scb_index + || (flag == SCB_DEVICE_RESET + && SCSIID_TARGET(ahc, saved_scsiid) == cmd->device->id))) { + + /* + * We're active on the bus, so assert ATN + * and hope that the target responds. + */ + pending_scb = ahc_lookup_scb(ahc, active_scb_index); + pending_scb->flags |= SCB_RECOVERY_SCB|flag; + ahc_outb(ahc, MSG_OUT, HOST_MSG); + ahc_outb(ahc, SCSISIGO, last_phase|ATNO); + printf("%s:%d:%d:%d: Device is active, asserting ATN\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + wait = TRUE; + } else if (disconnected) { + + /* + * Actually re-queue this SCB in an attempt + * to select the device before it reconnects. + * In either case (selection or reselection), + * we will now issue the approprate message + * to the timed-out device. + * + * Set the MK_MESSAGE control bit indicating + * that we desire to send a message. We + * also set the disconnected flag since + * in the paging case there is no guarantee + * that our SCB control byte matches the + * version on the card. We don't want the + * sequencer to abort the command thinking + * an unsolicited reselection occurred. + */ + pending_scb->hscb->control |= MK_MESSAGE|DISCONNECTED; + pending_scb->flags |= SCB_RECOVERY_SCB|flag; + + /* + * Remove any cached copy of this SCB in the + * disconnected list in preparation for the + * queuing of our abort SCB. We use the + * same element in the SCB, SCB_NEXT, for + * both the qinfifo and the disconnected list. + */ + ahc_search_disc_list(ahc, cmd->device->id, + cmd->device->channel + 'A', + cmd->device->lun, pending_scb->hscb->tag, + /*stop_on_first*/TRUE, + /*remove*/TRUE, + /*save_state*/FALSE); + + /* + * In the non-paging case, the sequencer will + * never re-reference the in-core SCB. + * To make sure we are notified during + * reslection, set the MK_MESSAGE flag in + * the card's copy of the SCB. + */ + if ((ahc->flags & AHC_PAGESCBS) == 0) { + ahc_outb(ahc, SCBPTR, pending_scb->hscb->tag); + ahc_outb(ahc, SCB_CONTROL, + ahc_inb(ahc, SCB_CONTROL)|MK_MESSAGE); + } + + /* + * Clear out any entries in the QINFIFO first + * so we are the next SCB for this target + * to run. + */ + ahc_search_qinfifo(ahc, cmd->device->id, + cmd->device->channel + 'A', + cmd->device->lun, SCB_LIST_NULL, + ROLE_INITIATOR, CAM_REQUEUE_REQ, + SEARCH_COMPLETE); + ahc_qinfifo_requeue_tail(ahc, pending_scb); + ahc_outb(ahc, SCBPTR, saved_scbptr); + ahc_print_path(ahc, pending_scb); + printf("Device is disconnected, re-queuing SCB\n"); + wait = TRUE; + } else { + printf("%s:%d:%d:%d: Unable to deliver message\n", + ahc_name(ahc), cmd->device->channel, cmd->device->id, + cmd->device->lun); + retval = FAILED; + goto done; + } + +no_cmd: + /* + * Our assumption is that if we don't have the command, no + * recovery action was required, so we return success. Again, + * the semantics of the mid-layer recovery engine are not + * well defined, so this may change in time. + */ + retval = SUCCESS; +done: + if (paused) + ahc_unpause(ahc); + if (wait) { + struct timer_list timer; + int ret; + + ahc->platform_data->flags |= AHC_UP_EH_SEMAPHORE; + spin_unlock_irq(&ahc->platform_data->spin_lock); + init_timer(&timer); + timer.data = (u_long)ahc; + timer.expires = jiffies + (5 * HZ); + timer.function = ahc_linux_sem_timeout; + add_timer(&timer); + printf("Recovery code sleeping\n"); + down(&ahc->platform_data->eh_sem); + printf("Recovery code awake\n"); + ret = del_timer_sync(&timer); + if (ret == 0) { + printf("Timer Expired\n"); + retval = FAILED; + } + spin_lock_irq(&ahc->platform_data->spin_lock); + } + ahc_schedule_runq(ahc); + ahc_linux_run_complete_queue(ahc); + ahc_midlayer_entrypoint_unlock(ahc, &s); + return (retval); +} + +void +ahc_platform_dump_card_state(struct ahc_softc *ahc) +{ + struct ahc_linux_device *dev; + int channel; + int maxchannel; + int target; + int maxtarget; + int lun; + int i; + + maxchannel = (ahc->features & AHC_TWIN) ? 1 : 0; + maxtarget = (ahc->features & AHC_WIDE) ? 15 : 7; + for (channel = 0; channel <= maxchannel; channel++) { + + for (target = 0; target <=maxtarget; target++) { + + for (lun = 0; lun < AHC_NUM_LUNS; lun++) { + struct ahc_cmd *acmd; + + dev = ahc_linux_get_device(ahc, channel, target, + lun, /*alloc*/FALSE); + if (dev == NULL) + continue; + + printf("DevQ(%d:%d:%d): ", + channel, target, lun); + i = 0; + TAILQ_FOREACH(acmd, &dev->busyq, + acmd_links.tqe) { + if (i++ > AHC_SCB_MAX) + break; + } + printf("%d waiting\n", i); + } + } + } +} + +static void ahc_linux_exit(void); + +static int __init +ahc_linux_init(void) +{ +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0) + int rc = ahc_linux_detect(&aic7xxx_driver_template); + if (rc) + return rc; + ahc_linux_exit(); + return -ENODEV; +#else + scsi_register_module(MODULE_SCSI_HA, &aic7xxx_driver_template); + if (aic7xxx_driver_template.present == 0) { + scsi_unregister_module(MODULE_SCSI_HA, + &aic7xxx_driver_template); + return (-ENODEV); + } + + return (0); +#endif +} + +static void +ahc_linux_exit(void) +{ + struct ahc_softc *ahc; + + /* + * Shutdown DV threads before going into the SCSI mid-layer. + * This avoids situations where the mid-layer locks the entire + * kernel so that waiting for our DV threads to exit leads + * to deadlock. + */ + TAILQ_FOREACH(ahc, &ahc_tailq, links) { + + ahc_linux_kill_dv_thread(ahc); + } + +#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) + /* + * In 2.4 we have to unregister from the PCI core _after_ + * unregistering from the scsi midlayer to avoid dangling + * references. + */ + scsi_unregister_module(MODULE_SCSI_HA, &aic7xxx_driver_template); +#endif + ahc_linux_pci_exit(); + ahc_linux_eisa_exit(); +} + +module_init(ahc_linux_init); +module_exit(ahc_linux_exit); |