diff options
| -rw-r--r-- | drivers/block/Kconfig | 2 | ||||
| -rw-r--r-- | drivers/block/Makefile | 1 | ||||
| -rw-r--r-- | drivers/block/mtip32xx/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/block/mtip32xx/Makefile | 5 | ||||
| -rw-r--r-- | drivers/block/mtip32xx/mtip32xx.c | 3651 | ||||
| -rw-r--r-- | drivers/block/mtip32xx/mtip32xx.h | 423 | ||||
| -rw-r--r-- | drivers/block/xen-blkback/blkback.c | 84 | ||||
| -rw-r--r-- | drivers/block/xen-blkback/common.h | 67 | ||||
| -rw-r--r-- | drivers/block/xen-blkback/xenbus.c | 12 | ||||
| -rw-r--r-- | drivers/block/xen-blkfront.c | 79 | ||||
| -rw-r--r-- | include/xen/interface/io/blkif.h | 40 |
11 files changed, 4261 insertions, 112 deletions
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index 6f07ec1c2f58..a30aa103f95b 100644 --- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -116,6 +116,8 @@ config PARIDE source "drivers/block/paride/Kconfig" +source "drivers/block/mtip32xx/Kconfig" + config BLK_CPQ_DA tristate "Compaq SMART2 support" depends on PCI && VIRT_TO_BUS diff --git a/drivers/block/Makefile b/drivers/block/Makefile index 76646e9a1c91..ad7b74a44ef3 100644 --- a/drivers/block/Makefile +++ b/drivers/block/Makefile @@ -39,5 +39,6 @@ obj-$(CONFIG_XEN_BLKDEV_FRONTEND) += xen-blkfront.o obj-$(CONFIG_XEN_BLKDEV_BACKEND) += xen-blkback/ obj-$(CONFIG_BLK_DEV_DRBD) += drbd/ obj-$(CONFIG_BLK_DEV_RBD) += rbd.o +obj-$(CONFIG_BLK_DEV_PCIESSD_MTIP32XX) += mtip32xx/ swim_mod-y := swim.o swim_asm.o diff --git a/drivers/block/mtip32xx/Kconfig b/drivers/block/mtip32xx/Kconfig new file mode 100644 index 000000000000..b5dd14e072f2 --- /dev/null +++ b/drivers/block/mtip32xx/Kconfig @@ -0,0 +1,9 @@ +# +# mtip32xx device driver configuration +# + +config BLK_DEV_PCIESSD_MTIP32XX + tristate "Block Device Driver for Micron PCIe SSDs" + depends on HOTPLUG_PCI_PCIE + help + This enables the block driver for Micron PCIe SSDs. diff --git a/drivers/block/mtip32xx/Makefile b/drivers/block/mtip32xx/Makefile new file mode 100644 index 000000000000..4fbef8c8329b --- /dev/null +++ b/drivers/block/mtip32xx/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for Block device driver for Micron PCIe SSD +# + +obj-$(CONFIG_BLK_DEV_PCIESSD_MTIP32XX) += mtip32xx.o diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c new file mode 100644 index 000000000000..b74eab70c3d0 --- /dev/null +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -0,0 +1,3651 @@ +/* + * Driver for the Micron P320 SSD + * Copyright (C) 2011 Micron Technology, Inc. + * + * Portions of this code were derived from works subjected to the + * following copyright: + * Copyright (C) 2009 Integrated Device Technology, Inc. + * + * 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 of the License, 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. + * + */ + +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/ata.h> +#include <linux/delay.h> +#include <linux/hdreg.h> +#include <linux/uaccess.h> +#include <linux/random.h> +#include <linux/smp.h> +#include <linux/compat.h> +#include <linux/fs.h> +#include <linux/module.h> +#include <linux/genhd.h> +#include <linux/blkdev.h> +#include <linux/bio.h> +#include <linux/dma-mapping.h> +#include <linux/idr.h> +#include <linux/kthread.h> +#include <../drivers/ata/ahci.h> +#include "mtip32xx.h" + +#define HW_CMD_SLOT_SZ (MTIP_MAX_COMMAND_SLOTS * 32) +#define HW_CMD_TBL_SZ (AHCI_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16)) +#define HW_CMD_TBL_AR_SZ (HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS) +#define HW_PORT_PRIV_DMA_SZ \ + (HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ) + +#define HOST_HSORG 0xFC +#define HSORG_DISABLE_SLOTGRP_INTR (1<<24) +#define HSORG_DISABLE_SLOTGRP_PXIS (1<<16) +#define HSORG_HWREV 0xFF00 +#define HSORG_STYLE 0x8 +#define HSORG_SLOTGROUPS 0x7 + +#define PORT_COMMAND_ISSUE 0x38 +#define PORT_SDBV 0x7C + +#define PORT_OFFSET 0x100 +#define PORT_MEM_SIZE 0x80 + +#define PORT_IRQ_ERR \ + (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \ + PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \ + PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \ + PORT_IRQ_OVERFLOW) +#define PORT_IRQ_LEGACY \ + (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS) +#define PORT_IRQ_HANDLED \ + (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \ + PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \ + PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY) +#define DEF_PORT_IRQ \ + (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS) + +/* product numbers */ +#define MTIP_PRODUCT_UNKNOWN 0x00 +#define MTIP_PRODUCT_ASICFPGA 0x11 + +/* Device instance number, incremented each time a device is probed. */ +static int instance; + +/* + * Global variable used to hold the major block device number + * allocated in mtip_init(). + */ +static int mtip_major; + +static DEFINE_SPINLOCK(rssd_index_lock); +static DEFINE_IDA(rssd_index_ida); + +static int mtip_block_initialize(struct driver_data *dd); + +#ifdef CONFIG_COMPAT +struct mtip_compat_ide_task_request_s { + __u8 io_ports[8]; + __u8 hob_ports[8]; + ide_reg_valid_t out_flags; + ide_reg_valid_t in_flags; + int data_phase; + int req_cmd; + compat_ulong_t out_size; + compat_ulong_t in_size; +}; +#endif + +/* + * This function check_for_surprise_removal is called + * while card is removed from the system and it will + * read the vendor id from the configration space + * + * @pdev Pointer to the pci_dev structure. + * + * return value + * true if device removed, else false + */ +static bool mtip_check_surprise_removal(struct pci_dev *pdev) +{ + u16 vendor_id = 0; + + /* Read the vendorID from the configuration space */ + pci_read_config_word(pdev, 0x00, &vendor_id); + if (vendor_id == 0xFFFF) + return true; /* device removed */ + + return false; /* device present */ +} + +/* + * This function is called for clean the pending command in the + * command slot during the surprise removal of device and return + * error to the upper layer. + * + * @dd Pointer to the DRIVER_DATA structure. + * + * return value + * None + */ +static void mtip_command_cleanup(struct driver_data *dd) +{ + int group = 0, commandslot = 0, commandindex = 0; + struct mtip_cmd *command; + struct mtip_port *port = dd->port; + + for (group = 0; group < 4; group++) { + for (commandslot = 0; commandslot < 32; commandslot++) { + if (!(port->allocated[group] & (1 << commandslot))) + continue; + + commandindex = group << 5 | commandslot; + command = &port->commands[commandindex]; + + if (atomic_read(&command->active) + && (command->async_callback)) { + command->async_callback(command->async_data, + -ENODEV); + command->async_callback = NULL; + command->async_data = NULL; + } + + dma_unmap_sg(&port->dd->pdev->dev, + command->sg, + command->scatter_ents, + command->direction); + } + } + + up(&port->cmd_slot); + + atomic_set(&dd->drv_cleanup_done, true); +} + +/* + * Obtain an empty command slot. + * + * This function needs to be reentrant since it could be called + * at the same time on multiple CPUs. The allocation of the + * command slot must be atomic. + * + * @port Pointer to the port data structure. + * + * return value + * >= 0 Index of command slot obtained. + * -1 No command slots available. + */ +static int get_slot(struct mtip_port *port) +{ + int slot, i; + unsigned int num_command_slots = port->dd->slot_groups * 32; + + /* + * Try 10 times, because there is a small race here. + * that's ok, because it's still cheaper than a lock. + * + * Race: Since this section is not protected by lock, same bit + * could be chosen by different process contexts running in + * different processor. So instead of costly lock, we are going + * with loop. + */ + for (i = 0; i < 10; i++) { + slot = find_next_zero_bit(port->allocated, + num_command_slots, 1); + if ((slot < num_command_slots) && + (!test_and_set_bit(slot, port->allocated))) + return slot; + } + dev_warn(&port->dd->pdev->dev, "Failed to get a tag.\n"); + + if (mtip_check_surprise_removal(port->dd->pdev)) { + /* Device not present, clean outstanding commands */ + mtip_command_cleanup(port->dd); + } + return -1; +} + +/* + * Release a command slot. + * + * @port Pointer to the port data structure. + * @tag Tag of command to release + * + * return value + * None + */ +static inline void release_slot(struct mtip_port *port, int tag) +{ + smp_mb__before_clear_bit(); + clear_bit(tag, port->allocated); + smp_mb__after_clear_bit(); +} + +/* + * Reset the HBA (without sleeping) + * + * Just like hba_reset, except does not call sleep, so can be + * run from interrupt/tasklet context. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 The reset was successful. + * -1 The HBA Reset bit did not clear. + */ +static int hba_reset_nosleep(struct driver_data *dd) +{ + unsigned long timeout; + + /* Chip quirk: quiesce any chip function */ + mdelay(10); + + /* Set the reset bit */ + writel(HOST_RESET, dd->mmio + HOST_CTL); + + /* Flush */ + readl(dd->mmio + HOST_CTL); + + /* + * Wait 10ms then spin for up to 1 second + * waiting for reset acknowledgement + */ + timeout = jiffies + msecs_to_jiffies(1000); + mdelay(10); + while ((readl(dd->mmio + HOST_CTL) & HOST_RESET) + && time_before(jiffies, timeout)) + mdelay(1); + + if (readl(dd->mmio + HOST_CTL) & HOST_RESET) + return -1; + + return 0; +} + +/* + * Issue a command to the hardware. + * + * Set the appropriate bit in the s_active and Command Issue hardware + * registers, causing hardware command processing to begin. + * + * @port Pointer to the port structure. + * @tag The tag of the command to be issued. + * + * return value + * None + */ +static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag) +{ + unsigned long flags = 0; + + atomic_set(&port->commands[tag].active, 1); + + spin_lock_irqsave(&port->cmd_issue_lock, flags); + + writel((1 << MTIP_TAG_BIT(tag)), + port->s_active[MTIP_TAG_INDEX(tag)]); + writel((1 << MTIP_TAG_BIT(tag)), + port->cmd_issue[MTIP_TAG_INDEX(tag)]); + + spin_unlock_irqrestore(&port->cmd_issue_lock, flags); +} + +/* + * Enable/disable the reception of FIS + * + * @port Pointer to the port data structure + * @enable 1 to enable, 0 to disable + * + * return value + * Previous state: 1 enabled, 0 disabled + */ +static int mtip_enable_fis(struct mtip_port *port, int enable) +{ + u32 tmp; + + /* enable FIS reception */ + tmp = readl(port->mmio + PORT_CMD); + if (enable) + writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD); + else + writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD); + + /* Flush */ + readl(port->mmio + PORT_CMD); + + return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX)); +} + +/* + * Enable/disable the DMA engine + * + * @port Pointer to the port data structure + * @enable 1 to enable, 0 to disable + * + * return value + * Previous state: 1 enabled, 0 disabled. + */ +static int mtip_enable_engine(struct mtip_port *port, int enable) +{ + u32 tmp; + + /* enable FIS reception */ + tmp = readl(port->mmio + PORT_CMD); + if (enable) + writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD); + else + writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD); + + readl(port->mmio + PORT_CMD); + return (((tmp & PORT_CMD_START) == PORT_CMD_START)); +} + +/* + * Enables the port DMA engine and FIS reception. + * + * return value + * None + */ +static inline void mtip_start_port(struct mtip_port *port) +{ + /* Enable FIS reception */ + mtip_enable_fis(port, 1); + + /* Enable the DMA engine */ + mtip_enable_engine(port, 1); +} + +/* + * Deinitialize a port by disabling port interrupts, the DMA engine, + * and FIS reception. + * + * @port Pointer to the port structure + * + * return value + * None + */ +static inline void mtip_deinit_port(struct mtip_port *port) +{ + /* Disable interrupts on this port */ + writel(0, port->mmio + PORT_IRQ_MASK); + + /* Disable the DMA engine */ + mtip_enable_engine(port, 0); + + /* Disable FIS reception */ + mtip_enable_fis(port, 0); +} + +/* + * Initialize a port. + * + * This function deinitializes the port by calling mtip_deinit_port() and + * then initializes it by setting the command header and RX FIS addresses, + * clearing the SError register and any pending port interrupts before + * re-enabling the default set of port interrupts. + * + * @port Pointer to the port structure. + * + * return value + * None + */ +static void mtip_init_port(struct mtip_port *port) +{ + int i; + mtip_deinit_port(port); + + /* Program the command list base and FIS base addresses */ + if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) { + writel((port->command_list_dma >> 16) >> 16, + port->mmio + PORT_LST_ADDR_HI); + writel((port->rxfis_dma >> 16) >> 16, + port->mmio + PORT_FIS_ADDR_HI); + } + + writel(port->command_list_dma & 0xFFFFFFFF, + port->mmio + PORT_LST_ADDR); + writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR); + + /* Clear SError */ + writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR); + + /* reset the completed registers.*/ + for (i = 0; i < port->dd->slot_groups; i++) + writel(0xFFFFFFFF, port->completed[i]); + + /* Clear any pending interrupts for this port */ + writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT); + + /* Enable port interrupts */ + writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK); +} + +/* + * Restart a port + * + * @port Pointer to the port data structure. + * + * return value + * None + */ +static void mtip_restart_port(struct mtip_port *port) +{ + unsigned long timeout; + + /* Disable the DMA engine */ + mtip_enable_engine(port, 0); + + /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */ + timeout = jiffies + msecs_to_jiffies(500); + while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) + && time_before(jiffies, timeout)) + ; + + /* + * Chip quirk: escalate to hba reset if + * PxCMD.CR not clear after 500 ms + */ + if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) { + dev_warn(&port->dd->pdev->dev, + "PxCMD.CR not clear, escalating reset\n"); + + if (hba_reset_nosleep(port->dd)) + dev_err(&port->dd->pdev->dev, + "HBA reset escalation failed.\n"); + + /* 30 ms delay before com reset to quiesce chip */ + mdelay(30); + } + + dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n"); + + /* Set PxSCTL.DET */ + writel(readl(port->mmio + PORT_SCR_CTL) | + 1, port->mmio + PORT_SCR_CTL); + readl(port->mmio + PORT_SCR_CTL); + + /* Wait 1 ms to quiesce chip function */ + timeout = jiffies + msecs_to_jiffies(1); + while (time_before(jiffies, timeout)) + ; + + /* Clear PxSCTL.DET */ + writel(readl(port->mmio + PORT_SCR_CTL) & ~1, + port->mmio + PORT_SCR_CTL); + readl(port->mmio + PORT_SCR_CTL); + + /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */ + timeout = jiffies + msecs_to_jiffies(500); + while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0) + && time_before(jiffies, timeout)) + ; + + if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0) + dev_warn(&port->dd->pdev->dev, + "COM reset failed\n"); + + /* Clear SError, the PxSERR.DIAG.x should be set so clear it */ + writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR); + + /* Enable the DMA engine */ + mtip_enable_engine(port, 1); +} + +/* + * Called periodically to see if any read/write commands are + * taking too long to complete. + * + * @data Pointer to the PORT data structure. + * + * return value + * None + */ +static void mtip_timeout_function(unsigned long int data) +{ + struct mtip_port *port = (struct mtip_port *) data; + struct host_to_dev_fis *fis; + struct mtip_cmd *command; + int tag, cmdto_cnt = 0; + unsigned int bit, group; + unsigned int num_command_slots = port->dd->slot_groups * 32; + + if (unlikely(!port)) + return; + + if (atomic_read(&port->dd->resumeflag) == true) { + mod_timer(&port->cmd_timer, + jiffies + msecs_to_jiffies(30000)); + return; + } + + for (tag = 0; tag < num_command_slots; tag++) { + /* + * Skip internal command slot as it has + * its own timeout mechanism + */ + if (tag == MTIP_TAG_INTERNAL) + continue; + + if (atomic_read(&port->commands[tag].active) && + (time_after(jiffies, port->commands[tag].comp_time))) { + group = tag >> 5; + bit = tag & 0x1F; + + command = &port->commands[tag]; + fis = (struct host_to_dev_fis *) command->command; + + dev_warn(&port->dd->pdev->dev, + "Timeout for command tag %d\n", tag); + + cmdto_cnt++; + if (cmdto_cnt == 1) + set_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags); + + /* + * Clear the completed bit. This should prevent + * any interrupt handlers from trying to retire + * the command. + */ + writel(1 << bit, port->completed[group]); + + /* Call the async completion callback. */ + if (likely(command->async_callback)) + command->async_callback(command->async_data, + -EIO); + command->async_callback = NULL; + command->comp_func = NULL; + + /* Unmap the DMA scatter list entries */ + dma_unmap_sg(&port->dd->pdev->dev, + command->sg, + command->scatter_ents, + command->direction); + + /* + * Clear the allocated bit and active tag for the + * command. + */ + atomic_set(&port->commands[tag].active, 0); + release_slot(port, tag); + + up(&port->cmd_slot); + } + } + + if (cmdto_cnt) { + dev_warn(&port->dd->pdev->dev, + "%d commands timed out: restarting port", + cmdto_cnt); + mtip_restart_port(port); + clear_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags); + wake_up_interruptible(&port->svc_wait); + } + + /* Restart the timer */ + mod_timer(&port->cmd_timer, + jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD)); +} + +/* + * IO completion function. + * + * This completion function is called by the driver ISR when a + * command that was issued by the kernel completes. It first calls the + * asynchronous completion function which normally calls back into the block + * layer passing the asynchronous callback data, then unmaps the + * scatter list associated with the completed command, and finally + * clears the allocated bit associated with the completed command. + * + * @port Pointer to the port data structure. + * @tag Tag of the command. + * @data Pointer to driver_data. + * @status Completion status. + * + * return value + * None + */ +static void mtip_async_complete(struct mtip_port *port, + int tag, + void *data, + int status) +{ + struct mtip_cmd *command; + struct driver_data *dd = data; + int cb_status = status ? -EIO : 0; + + if (unlikely(!dd) || unlikely(!port)) + return; + + command = &port->commands[tag]; + + if (unlikely(status == PORT_IRQ_TF_ERR)) { + dev_warn(&port->dd->pdev->dev, + "Command tag %d failed due to TFE\n", tag); + } + + /* Upper layer callback */ + if (likely(command->async_callback)) + command->async_callback(command->async_data, cb_status); + + command->async_callback = NULL; + command->comp_func = NULL; + + /* Unmap the DMA scatter list entries */ + dma_unmap_sg(&dd->pdev->dev, + command->sg, + command->scatter_ents, + command->direction); + + /* Clear the allocated and active bits for the command */ + atomic_set(&port->commands[tag].active, 0); + release_slot(port, tag); + + up(&port->cmd_slot); +} + +/* + * Internal command completion callback function. + * + * This function is normally called by the driver ISR when an internal + * command completed. This function signals the command completion by + * calling complete(). + * + * @port Pointer to the port data structure. + * @tag Tag of the command that has completed. + * @data Pointer to a completion structure. + * @status Completion status. + * + * return value + * None + */ +static void mtip_completion(struct mtip_port *port, + int tag, + void *data, + int status) +{ + struct mtip_cmd *command = &port->commands[tag]; + struct completion *waiting = data; + if (unlikely(status == PORT_IRQ_TF_ERR)) + dev_warn(&port->dd->pdev->dev, + "Internal command %d completed with TFE\n", tag); + + command->async_callback = NULL; + command->comp_func = NULL; + + complete(waiting); +} + +/* + * Helper function for tag logging + */ +static void print_tags(struct driver_data *dd, + char *msg, + unsigned long *tagbits) +{ + unsigned int tag, count = 0; + + for (tag = 0; tag < (dd->slot_groups) * 32; tag++) { + if (test_bit(tag, tagbits)) + count++; + } + if (count) + dev_info(&dd->pdev->dev, "%s [%i tags]\n", msg, count); +} + +/* + * Handle an error. + * + * @dd Pointer to the DRIVER_DATA structure. + * + * return value + * None + */ +static void mtip_handle_tfe(struct driver_data *dd) +{ + int group, tag, bit, reissue; + struct mtip_port *port; + struct mtip_cmd *command; + u32 completed; + struct host_to_dev_fis *fis; + unsigned long tagaccum[SLOTBITS_IN_LONGS]; + + dev_warn(&dd->pdev->dev, "Taskfile error\n"); + + port = dd->port; + + /* Stop the timer to prevent command timeouts. */ + del_timer(&port->cmd_timer); + + /* Set eh_active */ + set_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags); + + /* Loop through all the groups */ + for (group = 0; group < dd->slot_groups; group++) { + completed = readl(port->completed[group]); + + /* clear completed status register in the hardware.*/ + writel(completed, port->completed[group]); + + /* clear the tag accumulator */ + memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long)); + + /* Process successfully completed commands */ + for (bit = 0; bit < 32 && completed; bit++) { + if (!(completed & (1<<bit))) + continue; + tag = (group << 5) + bit; + + /* Skip the internal command slot */ + if (tag == MTIP_TAG_INTERNAL) + continue; + + command = &port->commands[tag]; + if (likely(command->comp_func)) { + set_bit(tag, tagaccum); + atomic_set(&port->commands[tag].active, 0); + command->comp_func(port, + tag, + command->comp_data, + 0); + } else { + dev_err(&port->dd->pdev->dev, + "Missing completion func for tag %d", + tag); + if (mtip_check_surprise_removal(dd->pdev)) { + mtip_command_cleanup(dd); + /* don't proceed further */ + return; + } + } + } + } + print_tags(dd, "TFE tags completed:", tagaccum); + + /* Restart the port */ + mdelay(20); + mtip_restart_port(port); + + /* clear the tag accumulator */ + memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long)); + + /* Loop through all the groups */ + for (group = 0; group < dd->slot_groups; group++) { + for (bit = 0; bit < 32; bit++) { + reissue = 1; + tag = (group << 5) + bit; + + /* If the active bit is set re-issue the command */ + if (atomic_read(&port->commands[tag].active) == 0) + continue; + + fis = (struct host_to_dev_fis *) + port->commands[tag].command; + + /* Should re-issue? */ + if (tag == MTIP_TAG_INTERNAL || + fis->command == ATA_CMD_SET_FEATURES) + reissue = 0; + + /* + * First check if this command has + * exceeded its retries. + */ + if (reissue && + (port->commands[tag].retries-- > 0)) { + + set_bit(tag, tagaccum); + + /* Update the timeout value. */ + port->commands[tag].comp_time = + jiffies + msecs_to_jiffies( + MTIP_NCQ_COMMAND_TIMEOUT_MS); + /* Re-issue the command. */ + mtip_issue_ncq_command(port, tag); + + continue; + } + + /* Retire a command that will not be reissued */ + dev_warn(&port->dd->pdev->dev, + "retiring tag %d\n", tag); + atomic_set(&port->commands[tag].active, 0); + + if (port->commands[tag].comp_func) + port->commands[tag].comp_func( + port, + tag, + port->commands[tag].comp_data, + PORT_IRQ_TF_ERR); + else + dev_warn(&port->dd->pdev->dev, + "Bad completion for tag %d\n", + tag); + } + } + print_tags(dd, "TFE tags reissued:", tagaccum); + + /* clear eh_active */ + clear_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags); + wake_up_interruptible(&port->svc_wait); + + mod_timer(&port->cmd_timer, + jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD)); +} + +/* + * Handle a set device bits interrupt + */ +static inline void mtip_process_sdbf(struct driver_data *dd) +{ + struct mtip_port *port = dd->port; + int group, tag, bit; + u32 completed; + struct mtip_cmd *command; + + /* walk all bits in all slot groups */ + for (group = 0; group < dd->slot_groups; group++) { + completed = readl(port->completed[group]); + + /* clear completed status register in the hardware.*/ + writel(completed, port->completed[group]); + + /* Process completed commands. */ + for (bit = 0; + (bit < 32) && completed; + bit++, completed >>= 1) { + if (completed & 0x01) { + tag = (group << 5) | bit; + + /* skip internal command slot. */ + if (unlikely(tag == MTIP_TAG_INTERNAL)) + continue; + + command = &port->commands[tag]; + /* make internal callback */ + if (likely(command->comp_func)) { + command->comp_func( + port, + tag, + command->comp_data, + 0); + } else { + dev_warn(&dd->pdev->dev, + "Null completion " + "for tag %d", + tag); + + if (mtip_check_surprise_removal( + dd->pdev)) { + mtip_command_cleanup(dd); + return; + } + } + } + } + } +} + +/* + * Process legacy pio and d2h interrupts + */ +static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat) +{ + struct mtip_port *port = dd->port; + struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL]; + + if (test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) && + (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL]) + & (1 << MTIP_TAG_INTERNAL))) { + if (cmd->comp_func) { + cmd->comp_func(port, + MTIP_TAG_INTERNAL, + cmd->comp_data, + 0); + return; + } + } + + dev_warn(&dd->pdev->dev, "IRQ status 0x%x ignored.\n", port_stat); + + return; +} + +/* + * Demux and handle errors + */ +static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat) +{ + if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) + mtip_handle_tfe(dd); + + if (unlikely(port_stat & PORT_IRQ_CONNECT)) { + dev_warn(&dd->pdev->dev, + "Clearing PxSERR.DIAG.x\n"); + writel((1 << 26), dd->port->mmio + PORT_SCR_ERR); + } + + if (unlikely(port_stat & PORT_IRQ_PHYRDY)) { + dev_warn(&dd->pdev->dev, + "Clearing PxSERR.DIAG.n\n"); + writel((1 << 16), dd->port->mmio + PORT_SCR_ERR); + } + + if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) { + dev_warn(&dd->pdev->dev, + "Port stat errors %x unhandled\n", + (port_stat & ~PORT_IRQ_HANDLED)); + } +} + +static inline irqreturn_t mtip_handle_irq(struct driver_data *data) +{ + struct driver_data *dd = (struct driver_data *) data; + struct mtip_port *port = dd->port; + u32 hba_stat, port_stat; + int rv = IRQ_NONE; + + hba_stat = readl(dd->mmio + HOST_IRQ_STAT); + if (hba_stat) { + rv = IRQ_HANDLED; + + /* Acknowledge the interrupt status on the port.*/ + port_stat = readl(port->mmio + PORT_IRQ_STAT); + writel(port_stat, port->mmio + PORT_IRQ_STAT); + + /* Demux port status */ + if (likely(port_stat & PORT_IRQ_SDB_FIS)) + mtip_process_sdbf(dd); + + if (unlikely(port_stat & PORT_IRQ_ERR)) { + if (unlikely(mtip_check_surprise_removal(dd->pdev))) { + mtip_command_cleanup(dd); + /* don't proceed further */ + return IRQ_HANDLED; + } + + mtip_process_errors(dd, port_stat & PORT_IRQ_ERR); + } + + if (unlikely(port_stat & PORT_IRQ_LEGACY)) + mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY); + } + + /* acknowledge interrupt */ + writel(hba_stat, dd->mmio + HOST_IRQ_STAT); + + return rv; +} + +/* + * Wrapper for mtip_handle_irq + * (ignores return code) + */ +static void mtip_tasklet(unsigned long data) +{ + mtip_handle_irq((struct driver_data *) data); +} + +/* + * HBA interrupt subroutine. + * + * @irq IRQ number. + * @instance Pointer to the driver data structure. + * + * return value + * IRQ_HANDLED A HBA interrupt was pending and handled. + * IRQ_NONE This interrupt was not for the HBA. + */ +static irqreturn_t mtip_irq_handler(int irq, void *instance) +{ + struct driver_data *dd = instance; + tasklet_schedule(&dd->tasklet); + return IRQ_HANDLED; +} + +static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag) +{ + atomic_set(&port->commands[tag].active, 1); + writel(1 << MTIP_TAG_BIT(tag), + port->cmd_issue[MTIP_TAG_INDEX(tag)]); +} + +/* + * Wait for port to quiesce + * + * @port Pointer to port data structure + * @timeout Max duration to wait (ms) + * + * return value + * 0 Success + * -EBUSY Commands still active + */ +static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout) +{ + unsigned long to; + unsigned int n; + unsigned int active = 1; + + to = jiffies + msecs_to_jiffies(timeout); + do { + if (test_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags) && + test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) { + msleep(20); + continue; /* svc thd is actively issuing commands */ + } + /* + * Ignore s_active bit 0 of array element 0. + * This bit will always be set + */ + active = readl(port->s_active[0]) & 0xFFFFFFFE; + for (n = 1; n < port->dd->slot_groups; n++) + active |= readl(port->s_active[n]); + + if (!active) + break; + + msleep(20); + } while (time_before(jiffies, to)); + + return active ? -EBUSY : 0; +} + +/* + * Execute an internal command and wait for the completion. + * + * @port Pointer to the port data structure. + * @fis Pointer to the FIS that describes the command. + * @fis_len Length in WORDS of the FIS. + * @buffer DMA accessible for command data. + * @buf_len Length, in bytes, of the data buffer. + * @opts Command header options, excluding the FIS length + * and the number of PRD entries. + * @timeout Time in ms to wait for the command to complete. + * + * return value + * 0 Command completed successfully. + * -EFAULT The buffer address is not correctly aligned. + * -EBUSY Internal command or other IO in progress. + * -EAGAIN Time out waiting for command to complete. + */ +static int mtip_exec_internal_command(struct mtip_port *port, + void *fis, + int fis_len, + dma_addr_t buffer, + int buf_len, + u32 opts, + gfp_t atomic, + unsigned long timeout) +{ + struct mtip_cmd_sg *command_sg; + DECLARE_COMPLETION_ONSTACK(wait); + int rv = 0; + struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL]; + + /* Make sure the buffer is 8 byte aligned. This is asic specific. */ + if (buffer & 0x00000007) { + dev_err(&port->dd->pdev->dev, + "SG buffer is not 8 byte aligned\n"); + return -EFAULT; + } + + /* Only one internal command should be running at a time */ + if (test_and_set_bit(MTIP_TAG_INTERNAL, port->allocated)) { + dev_warn(&port->dd->pdev->dev, + "Internal command already active\n"); + return -EBUSY; + } + set_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags); + + if (atomic == GFP_KERNEL) { + /* wait for io to complete if non atomic */ + if (mtip_quiesce_io(port, 5000) < 0) { + dev_warn(&port->dd->pdev->dev, + "Failed to quiesce IO\n"); + release_slot(port, MTIP_TAG_INTERNAL); + clear_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags); + wake_up_interruptible(&port->svc_wait); + return -EBUSY; + } + + /* Set the completion function and data for the command. */ + int_cmd->comp_data = &wait; + int_cmd->comp_func = mtip_completion; + + } else { + /* Clear completion - we're going to poll */ + int_cmd->comp_data = NULL; + int_cmd->comp_func = NULL; + } + + /* Copy the command to the command table */ + memcpy(int_cmd->command, fis, fis_len*4); + + /* Populate the SG list */ + int_cmd->command_header->opts = + __force_bit2int cpu_to_le32(opts | fis_len); + if (buf_len) { + command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ; + + command_sg->info = + __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF); + command_sg->dba = + __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF); + command_sg->dba_upper = + __force_bit2int cpu_to_le32((buffer >> 16) >> 16); + + int_cmd->command_header->opts |= + __force_bit2int cpu_to_le32((1 << 16)); + } + + /* Populate the command header */ + int_cmd->command_header->byte_count = 0; + + /* Issue the command to the hardware */ + mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL); + + /* Poll if atomic, wait_for_completion otherwise */ + if (atomic == GFP_KERNEL) { + /* Wait for the command to complete or timeout. */ + if (wait_for_completion_timeout( + &wait, + msecs_to_jiffies(timeout)) == 0) { + dev_err(&port->dd->pdev->dev, + "Internal command did not complete [%d] " + "within timeout of %lu ms\n", + atomic, timeout); + rv = -EAGAIN; + } + + if (readl(port->cmd_issue[MTIP_TAG_INTERNAL]) + & (1 << MTIP_TAG_INTERNAL)) { + dev_warn(&port->dd->pdev->dev, + "Retiring internal command but CI is 1.\n"); + } + + } else { + /* Spin for <timeout> checking if command still outstanding */ + timeout = jiffies + msecs_to_jiffies(timeout); + + while ((readl( + port->cmd_issue[MTIP_TAG_INTERNAL]) + & (1 << MTIP_TAG_INTERNAL)) + && time_before(jiffies, timeout)) + ; + + if (readl(port->cmd_issue[MTIP_TAG_INTERNAL]) + & (1 << MTIP_TAG_INTERNAL)) { + dev_err(&port->dd->pdev->dev, + "Internal command did not complete [%d]\n", + atomic); + rv = -EAGAIN; + } + } + + /* Clear the allocated and active bits for the internal command. */ + atomic_set(&int_cmd->active, 0); + release_slot(port, MTIP_TAG_INTERNAL); + clear_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags); + wake_up_interruptible(&port->svc_wait); + + return rv; +} + +/* + * Byte-swap ATA ID strings. + * + * ATA identify data contains strings in byte-swapped 16-bit words. + * They must be swapped (on all architectures) to be usable as C strings. + * This function swaps bytes in-place. + * + * @buf The buffer location of the string + * @len The number of bytes to swap + * + * return value + * None + */ +static inline void ata_swap_string(u16 *buf, unsigned int len) +{ + int i; + for (i = 0; i < (len/2); i++) + be16_to_cpus(&buf[i]); +} + +/* + * Request the device identity information. + * + * If a user space buffer is not specified, i.e. is NULL, the + * identify information is still read from the drive and placed + * into the identify data buffer (@e port->identify) in the + * port data structure. + * When the identify buffer contains valid identify information @e + * port->identify_valid is non-zero. + * + * @port Pointer to the port structure. + * @user_buffer A user space buffer where the identify data should be + * copied. + * + * return value + * 0 Command completed successfully. + * -EFAULT An error occurred while coping data to the user buffer. + * -1 Command failed. + */ +static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer) +{ + int rv = 0; + struct host_to_dev_fis fis; + + /* Build the FIS. */ + memset(&fis, 0, sizeof(struct host_to_dev_fis)); + fis.type = 0x27; + fis.opts = 1 << 7; + fis.command = ATA_CMD_ID_ATA; + + /* Set the identify information as invalid. */ + port->identify_valid = 0; + + /* Clear the identify information. */ + memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS); + + /* Execute the command. */ + if (mtip_exec_internal_command(port, + &fis, + 5, + port->identify_dma, + sizeof(u16) * ATA_ID_WORDS, + 0, + GFP_KERNEL, + MTIP_INTERNAL_COMMAND_TIMEOUT_MS) + < 0) { + rv = -1; + goto out; + } + + /* + * Perform any necessary byte-swapping. Yes, the kernel does in fact + * perform field-sensitive swapping on the string fields. + * See the kernel use of ata_id_string() for proof of this. + */ +#ifdef __LITTLE_ENDIAN + ata_swap_string(port->identify + 27, 40); /* model string*/ + ata_swap_string(port->identify + 23, 8); /* firmware string*/ + ata_swap_string(port->identify + 10, 20); /* serial# string*/ +#else + { + int i; + for (i = 0; i < ATA_ID_WORDS; i++) + port->identify[i] = le16_to_cpu(port->identify[i]); + } +#endif + + /* Set the identify buffer as valid. */ + port->identify_valid = 1; + + if (user_buffer) { + if (copy_to_user( + user_buffer, + port->identify, + ATA_ID_WORDS * sizeof(u16))) { + rv = -EFAULT; + goto out; + } + } + +out: + return rv; +} + +/* + * Issue a standby immediate command to the device. + * + * @port Pointer to the port structure. + * + * return value + * 0 Command was executed successfully. + * -1 An error occurred while executing the command. + */ +static int mtip_standby_immediate(struct mtip_port *port) +{ + int rv; + struct host_to_dev_fis fis; + + /* Build the FIS. */ + memset(&fis, 0, sizeof(struct host_to_dev_fis)); + fis.type = 0x27; + fis.opts = 1 << 7; + fis.command = ATA_CMD_STANDBYNOW1; + + /* Execute the command. Use a 15-second timeout for large drives. */ + rv = mtip_exec_internal_command(port, + &fis, + 5, + 0, + 0, + 0, + GFP_KERNEL, + 15000); + + return rv; +} + +/* + * Get the drive capacity. + * + * @dd Pointer to the device data structure. + * @sectors Pointer to the variable that will receive the sector count. + * + * return value + * 1 Capacity was returned successfully. + * 0 The identify information is invalid. + */ +static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors) +{ + struct mtip_port *port = dd->port; + u64 total, raw0, raw1, raw2, raw3; + raw0 = port->identify[100]; + raw1 = port->identify[101]; + raw2 = port->identify[102]; + raw3 = port->identify[103]; + total = raw0 | raw1<<16 | raw2<<32 | raw3<<48; + *sectors = total; + return (bool) !!port->identify_valid; +} + +/* + * Reset the HBA. + * + * Resets the HBA by setting the HBA Reset bit in the Global + * HBA Control register. After setting the HBA Reset bit the + * function waits for 1 second before reading the HBA Reset + * bit to make sure it has cleared. If HBA Reset is not clear + * an error is returned. Cannot be used in non-blockable + * context. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 The reset was successful. + * -1 The HBA Reset bit did not clear. + */ +static int mtip_hba_reset(struct driver_data *dd) +{ + mtip_deinit_port(dd->port); + + /* Set the reset bit */ + writel(HOST_RESET, dd->mmio + HOST_CTL); + + /* Flush */ + readl(dd->mmio + HOST_CTL); + + /* Wait for reset to clear */ + ssleep(1); + + /* Check the bit has cleared */ + if (readl(dd->mmio + HOST_CTL) & HOST_RESET) { + dev_err(&dd->pdev->dev, + "Reset bit did not clear.\n"); + return -1; + } + + return 0; +} + +/* + * Display the identify command data. + * + * @port Pointer to the port data structure. + * + * return value + * None + */ +static void mtip_dump_identify(struct mtip_port *port) +{ + sector_t sectors; + unsigned short revid; + char cbuf[42]; + + if (!port->identify_valid) + return; + + strlcpy(cbuf, (char *)(port->identify+10), 21); + dev_info(&port->dd->pdev->dev, + "Serial No.: %s\n", cbuf); + + strlcpy(cbuf, (char *)(port->identify+23), 9); + dev_info(&port->dd->pdev->dev, + "Firmware Ver.: %s\n", cbuf); + + strlcpy(cbuf, (char *)(port->identify+27), 41); + dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf); + + if (mtip_hw_get_capacity(port->dd, §ors)) + dev_info(&port->dd->pdev->dev, + "Capacity: %llu sectors (%llu MB)\n", + (u64)sectors, + ((u64)sectors) * ATA_SECT_SIZE >> 20); + + pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid); + switch (revid & 0xFF) { + case 0x1: + strlcpy(cbuf, "A0", 3); + break; + case 0x3: + strlcpy(cbuf, "A2", 3); + break; + default: + strlcpy(cbuf, "?", 2); + break; + } + dev_info(&port->dd->pdev->dev, + "Card Type: %s\n", cbuf); +} + +/* + * Map the commands scatter list into the command table. + * + * @command Pointer to the command. + * @nents Number of scatter list entries. + * + * return value + * None + */ +static inline void fill_command_sg(struct driver_data *dd, + struct mtip_cmd *command, + int nents) +{ + int n; + unsigned int dma_len; + struct mtip_cmd_sg *command_sg; + struct scatterlist *sg = command->sg; + + command_sg = command->command + AHCI_CMD_TBL_HDR_SZ; + + for (n = 0; n < nents; n++) { + dma_len = sg_dma_len(sg); + if (dma_len > 0x400000) + dev_err(&dd->pdev->dev, + "DMA segment length truncated\n"); + command_sg->info = __force_bit2int + cpu_to_le32((dma_len-1) & 0x3FFFFF); + command_sg->dba = __force_bit2int + cpu_to_le32(sg_dma_address(sg)); + command_sg->dba_upper = __force_bit2int + cpu_to_le32((sg_dma_address(sg) >> 16) >> 16); + command_sg++; + sg++; + } +} + +/* + * @brief Execute a drive command. + * + * return value 0 The command completed successfully. + * return value -1 An error occurred while executing the command. + */ +static int exec_drive_task(struct mtip_port *port, u8 *command) +{ + struct host_to_dev_fis fis; + struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG); + + /* Build the FIS. */ + memset(&fis, 0, sizeof(struct host_to_dev_fis)); + fis.type = 0x27; + fis.opts = 1 << 7; + fis.command = command[0]; + fis.features = command[1]; + fis.sect_count = command[2]; + fis.sector = command[3]; + fis.cyl_low = command[4]; + fis.cyl_hi = command[5]; + fis.device = command[6] & ~0x10; /* Clear the dev bit*/ + + + dbg_printk(MTIP_DRV_NAME "%s: User Command: cmd %x, feat %x, " + "nsect %x, sect %x, lcyl %x, " + "hcyl %x, sel %x\n", + __func__, + command[0], + command[1], + command[2], + command[3], + command[4], + command[5], + command[6]); + + /* Execute the command. */ + if (mtip_exec_internal_command(port, + &fis, + 5, + 0, + 0, + 0, + GFP_KERNEL, + MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) { + return -1; + } + + command[0] = reply->command; /* Status*/ + command[1] = reply->features; /* Error*/ + command[4] = reply->cyl_low; + command[5] = reply->cyl_hi; + + dbg_printk(MTIP_DRV_NAME "%s: Completion Status: stat %x, " + "err %x , cyl_lo %x cyl_hi %x\n", + __func__, + command[0], + command[1], + command[4], + command[5]); + + return 0; +} + +/* + * @brief Execute a drive command. + * + * @param port Pointer to the port data structure. + * @param command Pointer to the user specified command parameters. + * @param user_buffer Pointer to the user space buffer where read sector + * data should be copied. + * + * return value 0 The command completed successfully. + * return value -EFAULT An error occurred while copying the completion + * data to the user space buffer. + * return value -1 An error occurred while executing the command. + */ +static int exec_drive_command(struct mtip_port *port, u8 *command, + void __user *user_buffer) +{ + struct host_to_dev_fis fis; + struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG); + + /* Build the FIS. */ + memset(&fis, 0, sizeof(struct host_to_dev_fis)); + fis.type = 0x27; + fis.opts = 1 << 7; + fis.command = command[0]; + fis.features = command[2]; + fis.sect_count = command[3]; + if (fis.command == ATA_CMD_SMART) { + fis.sector = command[1]; + fis.cyl_low = 0x4F; + fis.cyl_hi = 0xC2; + } + + dbg_printk(MTIP_DRV_NAME + "%s: User Command: cmd %x, sect %x, " + "feat %x, sectcnt %x\n", + __func__, + command[0], + command[1], + command[2], + command[3]); + + memset(port->sector_buffer, 0x00, ATA_SECT_SIZE); + + /* Execute the command. */ + if (mtip_exec_internal_command(port, + &fis, + 5, + port->sector_buffer_dma, + (command[3] != 0) ? ATA_SECT_SIZE : 0, + 0, + GFP_KERNEL, + MTIP_IOCTL_COMMAND_TIMEOUT_MS) + < 0) { + return -1; + } + + /* Collect the completion status. */ + command[0] = reply->command; /* Status*/ + command[1] = reply->features; /* Error*/ + command[2] = command[3]; + + dbg_printk(MTIP_DRV_NAME + "%s: Completion Status: stat %x, " + "err %x, cmd %x\n", + __func__, + command[0], + command[1], + command[2]); + + if (user_buffer && command[3]) { + if (copy_to_user(user_buffer, + port->sector_buffer, + ATA_SECT_SIZE * command[3])) { + return -EFAULT; + } + } + + return 0; +} + +/* + * Indicates whether a command has a single sector payload. + * + * @command passed to the device to perform the certain event. + * @features passed to the device to perform the certain event. + * + * return value + * 1 command is one that always has a single sector payload, + * regardless of the value in the Sector Count field. + * 0 otherwise + * + */ +static unsigned int implicit_sector(unsigned char command, + unsigned char features) +{ + unsigned int rv = 0; + + /* list of commands that have an implicit sector count of 1 */ + switch (command) { + case ATA_CMD_SEC_SET_PASS: + case ATA_CMD_SEC_UNLOCK: + case ATA_CMD_SEC_ERASE_PREP: + case ATA_CMD_SEC_ERASE_UNIT: + case ATA_CMD_SEC_FREEZE_LOCK: + case ATA_CMD_SEC_DISABLE_PASS: + case ATA_CMD_PMP_READ: + case ATA_CMD_PMP_WRITE: + rv = 1; + break; + case ATA_CMD_SET_MAX: + if (features == ATA_SET_MAX_UNLOCK) + rv = 1; + break; + case ATA_CMD_SMART: + if ((features == ATA_SMART_READ_VALUES) || + (features == ATA_SMART_READ_THRESHOLDS)) + rv = 1; + break; + case ATA_CMD_CONF_OVERLAY: + if ((features == ATA_DCO_IDENTIFY) || + (features == ATA_DCO_SET)) + rv = 1; + break; + } + return rv; +} + +/* + * Executes a taskfile + * See ide_taskfile_ioctl() for derivation + */ +static int exec_drive_taskfile(struct driver_data *dd, + void __user *buf, + ide_task_request_t *req_task, + int outtotal) +{ + struct host_to_dev_fis fis; + struct host_to_dev_fis *reply; + u8 *outbuf = NULL; + u8 *inbuf = NULL; + dma_addr_t outbuf_dma = 0; + dma_addr_t inbuf_dma = 0; + dma_addr_t dma_buffer = 0; + int err = 0; + unsigned int taskin = 0; + unsigned int taskout = 0; + u8 nsect = 0; + unsigned int timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS; + unsigned int force_single_sector; + unsigned int transfer_size; + unsigned long task_file_data; + int intotal = outtotal + req_task->out_size; + + taskout = req_task->out_size; + taskin = req_task->in_size; + /* 130560 = 512 * 0xFF*/ + if (taskin > 130560 || taskout > 130560) { + err = -EINVAL; + goto abort; + } + + if (taskout) { + outbuf = kzalloc(taskout, GFP_KERNEL); + if (outbuf == NULL) { + err = -ENOMEM; + goto abort; + } + if (copy_from_user(outbuf, buf + outtotal, taskout)) { + err = -EFAULT; + goto abort; + } + outbuf_dma = pci_map_single(dd->pdev, + outbuf, + taskout, + DMA_TO_DEVICE); + if (outbuf_dma == 0) { + err = -ENOMEM; + goto abort; + } + dma_buffer = outbuf_dma; + } + + if (taskin) { + inbuf = kzalloc(taskin, GFP_KERNEL); + if (inbuf == NULL) { + err = -ENOMEM; + goto abort; + } + + if (copy_from_user(inbuf, buf + intotal, taskin)) { + err = -EFAULT; + goto abort; + } + inbuf_dma = pci_map_single(dd->pdev, + inbuf, + taskin, DMA_FROM_DEVICE); + if (inbuf_dma == 0) { + err = -ENOMEM; + goto abort; + } + dma_buffer = inbuf_dma; + } + + /* only supports PIO and non-data commands from this ioctl. */ + switch (req_task->data_phase) { + case TASKFILE_OUT: + nsect = taskout / ATA_SECT_SIZE; + reply = (dd->port->rxfis + RX_FIS_PIO_SETUP); + break; + case TASKFILE_IN: + reply = (dd->port->rxfis + RX_FIS_PIO_SETUP); + break; + case TASKFILE_NO_DATA: + reply = (dd->port->rxfis + RX_FIS_D2H_REG); + break; + default: + err = -EINVAL; + goto abort; + } + + /* Build the FIS. */ + memset(&fis, 0, sizeof(struct host_to_dev_fis)); + + fis.type = 0x27; + fis.opts = 1 << 7; + fis.command = req_task->io_ports[7]; + fis.features = req_task->io_ports[1]; + fis.sect_count = req_task->io_ports[2]; + fis.lba_low = req_task->io_ports[3]; + fis.lba_mid = req_task->io_ports[4]; + fis.lba_hi = req_task->io_ports[5]; + /* Clear the dev bit*/ + fis.device = req_task->io_ports[6] & ~0x10; + + if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) { + req_task->in_flags.all = + IDE_TASKFILE_STD_IN_FLAGS | + (IDE_HOB_STD_IN_FLAGS << 8); + fis.lba_low_ex = req_task->hob_ports[3]; + fis.lba_mid_ex = req_task->hob_ports[4]; + fis.lba_hi_ex = req_task->hob_ports[5]; + fis.features_ex = req_task->hob_ports[1]; + fis.sect_cnt_ex = req_task->hob_ports[2]; + + } else { + req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS; + } + + force_single_sector = implicit_sector(fis.command, fis.features); + + if ((taskin || taskout) && (!fis.sect_count)) { + if (nsect) + fis.sect_count = nsect; + else { + if (!force_single_sector) { + dev_warn(&dd->pdev->dev, + "data movement but " + "sect_count is 0\n"); + err = -EINVAL; + goto abort; + } + } + } + + dbg_printk(MTIP_DRV_NAME + "taskfile: cmd %x, feat %x, nsect %x," + " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x," + " head/dev %x\n", + fis.command, + fis.features, + fis.sect_count, + fis.lba_low, + fis.lba_mid, + fis.lba_hi, + fis.device); + + switch (fis.command) { + case ATA_CMD_DOWNLOAD_MICRO: + /* Change timeout for Download Microcode to 60 seconds.*/ + timeout = 60000; + break; + case ATA_CMD_SEC_ERASE_UNIT: + /* Change timeout for Security Erase Unit to 4 minutes.*/ + timeout = 240000; + break; + case ATA_CMD_STANDBYNOW1: + /* Change timeout for standby immediate to 10 seconds.*/ + timeout = 10000; + break; + case 0xF7: + case 0xFA: + /* Change timeout for vendor unique command to 10 secs */ + timeout = 10000; + break; + case ATA_CMD_SMART: + /* Change timeout for vendor unique command to 10 secs */ + timeout = 10000; + break; + default: + timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS; + break; + } + + /* Determine the correct transfer size.*/ + if (force_single_sector) + transfer_size = ATA_SECT_SIZE; + else + transfer_size = ATA_SECT_SIZE * fis.sect_count; + + /* Execute the command.*/ + if (mtip_exec_internal_command(dd->port, + &fis, + 5, + dma_buffer, + transfer_size, + 0, + GFP_KERNEL, + timeout) < 0) { + err = -EIO; + goto abort; + } + + task_file_data = readl(dd->port->mmio+PORT_TFDATA); + + if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) { + reply = dd->port->rxfis + RX_FIS_PIO_SETUP; + req_task->io_ports[7] = reply->control; + } else { + reply = dd->port->rxfis + RX_FIS_D2H_REG; + req_task->io_ports[7] = reply->command; + } + + /* reclaim the DMA buffers.*/ + if (inbuf_dma) + pci_unmap_single(dd->pdev, inbuf_dma, + taskin, DMA_FROM_DEVICE); + if (outbuf_dma) + pci_unmap_single(dd->pdev, outbuf_dma, + taskout, DMA_TO_DEVICE); + inbuf_dma = 0; + outbuf_dma = 0; + + /* return the ATA registers to the caller.*/ + req_task->io_ports[1] = reply->features; + req_task->io_ports[2] = reply->sect_count; + req_task->io_ports[3] = reply->lba_low; + req_task->io_ports[4] = reply->lba_mid; + req_task->io_ports[5] = reply->lba_hi; + req_task->io_ports[6] = reply->device; + + if (req_task->out_flags.all & 1) { + + req_task->hob_ports[3] = reply->lba_low_ex; + req_task->hob_ports[4] = reply->lba_mid_ex; + req_task->hob_ports[5] = reply->lba_hi_ex; + req_task->hob_ports[1] = reply->features_ex; + req_task->hob_ports[2] = reply->sect_cnt_ex; + } + + /* Com rest after secure erase or lowlevel format */ + if (((fis.command == ATA_CMD_SEC_ERASE_UNIT) || + ((fis.command == 0xFC) && + (fis.features == 0x27 || fis.features == 0x72 || + fis.features == 0x62 || fis.features == 0x26))) && + !(reply->command & 1)) { + mtip_restart_port(dd->port); + } + + dbg_printk(MTIP_DRV_NAME + "%s: Completion: stat %x," + "err %x, sect_cnt %x, lbalo %x," + "lbamid %x, lbahi %x, dev %x\n", + __func__, + req_task->io_ports[7], + req_task->io_ports[1], + req_task->io_ports[2], + req_task->io_ports[3], + req_task->io_ports[4], + req_task->io_ports[5], + req_task->io_ports[6]); + + if (taskout) { + if (copy_to_user(buf + outtotal, outbuf, taskout)) { + err = -EFAULT; + goto abort; + } + } + if (taskin) { + if (copy_to_user(buf + intotal, inbuf, taskin)) { + err = -EFAULT; + goto abort; + } + } +abort: + if (inbuf_dma) + pci_unmap_single(dd->pdev, inbuf_dma, + taskin, DMA_FROM_DEVICE); + if (outbuf_dma) + pci_unmap_single(dd->pdev, outbuf_dma, + taskout, DMA_TO_DEVICE); + kfree(outbuf); + kfree(inbuf); + + return err; +} + +/* + * Handle IOCTL calls from the Block Layer. + * + * This function is called by the Block Layer when it receives an IOCTL + * command that it does not understand. If the IOCTL command is not supported + * this function returns -ENOTTY. + * + * @dd Pointer to the driver data structure. + * @cmd IOCTL command passed from the Block Layer. + * @arg IOCTL argument passed from the Block Layer. + * + * return value + * 0 The IOCTL completed successfully. + * -ENOTTY The specified command is not supported. + * -EFAULT An error occurred copying data to a user space buffer. + * -EIO An error occurred while executing the command. + */ +static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case HDIO_GET_IDENTITY: + if (mtip_get_identify(dd->port, (void __user *) arg) < 0) { + dev_warn(&dd->pdev->dev, + "Unable to read identity\n"); + return -EIO; + } + + break; + case HDIO_DRIVE_CMD: + { + u8 drive_command[4]; + + /* Copy the user command info to our buffer. */ + if (copy_from_user(drive_command, + (void __user *) arg, + sizeof(drive_command))) + return -EFAULT; + + /* Execute the drive command. */ + if (exec_drive_command(dd->port, + drive_command, + (void __user *) (arg+4))) + return -EIO; + + /* Copy the status back to the users buffer. */ + if (copy_to_user((void __user *) arg, + drive_command, + sizeof(drive_command))) + return -EFAULT; + + break; + } + case HDIO_DRIVE_TASK: + { + u8 drive_command[7]; + + /* Copy the user command info to our buffer. */ + if (copy_from_user(drive_command, + (void __user *) arg, + sizeof(drive_command))) + return -EFAULT; + + /* Execute the drive command. */ + if (exec_drive_task(dd->port, drive_command)) + return -EIO; + + /* Copy the status back to the users buffer. */ + if (copy_to_user((void __user *) arg, + drive_command, + sizeof(drive_command))) + return -EFAULT; + + break; + } + case HDIO_DRIVE_TASKFILE: { + ide_task_request_t req_task; + int ret, outtotal; + + if (copy_from_user(&req_task, (void __user *) arg, + sizeof(req_task))) + return -EFAULT; + + outtotal = sizeof(req_task); + + ret = exec_drive_taskfile(dd, (void __user *) arg, + &req_task, outtotal); + + if (copy_to_user((void __user *) arg, &req_task, + sizeof(req_task))) + return -EFAULT; + + return ret; + } + + default: + return -EINVAL; + } + return 0; +} + +/* + * Submit an IO to the hw + * + * This function is called by the block layer to issue an io + * to the device. Upon completion, the callback function will + * be called with the data parameter passed as the callback data. + * + * @dd Pointer to the driver data structure. + * @start First sector to read. + * @nsect Number of sectors to read. + * @nents Number of entries in scatter list for the read command. + * @tag The tag of this read command. + * @callback Pointer to the function that should be called + * when the read completes. + * @data Callback data passed to the callback function + * when the read completes. + * @barrier If non-zero, this command must be completed before + * issuing any other commands. + * @dir Direction (read or write) + * + * return value + * None + */ +static void mtip_hw_submit_io(struct driver_data *dd, sector_t start, + int nsect, int nents, int tag, void *callback, + void *data, int barrier, int dir) +{ + struct host_to_dev_fis *fis; + struct mtip_port *port = dd->port; + struct mtip_cmd *command = &port->commands[tag]; + + /* Map the scatter list for DMA access */ + if (dir == READ) + nents = dma_map_sg(&dd->pdev->dev, command->sg, + nents, DMA_FROM_DEVICE); + else + nents = dma_map_sg(&dd->pdev->dev, command->sg, + nents, DMA_TO_DEVICE); + + command->scatter_ents = nents; + + /* + * The number of retries for this command before it is + * reported as a failure to the upper layers. + */ + command->retries = MTIP_MAX_RETRIES; + + /* Fill out fis */ + fis = command->command; + fis->type = 0x27; + fis->opts = 1 << 7; + fis->command = + (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE); + *((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF); + *((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF); + fis->device = 1 << 6; + if (barrier) + fis->device |= FUA_BIT; + fis->features = nsect & 0xFF; + fis->features_ex = (nsect >> 8) & 0xFF; + fis->sect_count = ((tag << 3) | (tag >> 5)); + fis->sect_cnt_ex = 0; + fis->control = 0; + fis->res2 = 0; + fis->res3 = 0; + fill_command_sg(dd, command, nents); + + /* Populate the command header */ + command->command_header->opts = + __force_bit2int cpu_to_le32( + (nents << 16) | 5 | AHCI_CMD_PREFETCH); + command->command_header->byte_count = 0; + + /* + * Set the completion function and data for the command + * within this layer. + */ + command->comp_data = dd; + command->comp_func = mtip_async_complete; + command->direction = (dir == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE); + + /* + * Set the completion function and data for the command passed + * from the upper layer. + */ + command->async_data = data; + command->async_callback = callback; + + /* + * To prevent this command from being issued + * if an internal command is in progress or error handling is active. + */ + if (unlikely(test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) || + test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags))) { + set_bit(tag, port->cmds_to_issue); + set_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags); + return; + } + + /* Issue the command to the hardware */ + mtip_issue_ncq_command(port, tag); + + /* Set the command's timeout value.*/ + port->commands[tag].comp_time = jiffies + msecs_to_jiffies( + MTIP_NCQ_COMMAND_TIMEOUT_MS); +} + +/* + * Release a command slot. + * + * @dd Pointer to the driver data structure. + * @tag Slot tag + * + * return value + * None + */ +static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag) +{ + release_slot(dd->port, tag); +} + +/* + * Obtain a command slot and return its associated scatter list. + * + * @dd Pointer to the driver data structure. + * @tag Pointer to an int that will receive the allocated command + * slot tag. + * + * return value + * Pointer to the scatter list for the allocated command slot + * or NULL if no command slots are available. + */ +static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd, + int *tag) +{ + /* + * It is possible that, even with this semaphore, a thread + * may think that no command slots are available. Therefore, we + * need to make an attempt to get_slot(). + */ + down(&dd->port->cmd_slot); + *tag = get_slot(dd->port); + + if (unlikely(*tag < 0)) + return NULL; + + return dd->port->commands[*tag].sg; +} + +/* + * Sysfs register/status dump. + * + * @dev Pointer to the device structure, passed by the kernrel. + * @attr Pointer to the device_attribute structure passed by the kernel. + * @buf Pointer to the char buffer that will receive the stats info. + * + * return value + * The size, in bytes, of the data copied into buf. + */ +static ssize_t hw_show_registers(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + u32 group_allocated; + struct driver_data *dd = dev_to_disk(dev)->private_data; + int size = 0; + int n; + + size += sprintf(&buf[size], "%s:\ns_active:\n", __func__); + + for (n = 0; n < dd->slot_groups; n++) + size += sprintf(&buf[size], "0x%08x\n", + readl(dd->port->s_active[n])); + + size += sprintf(&buf[size], "Command Issue:\n"); + + for (n = 0; n < dd->slot_groups; n++) + size += sprintf(&buf[size], "0x%08x\n", + readl(dd->port->cmd_issue[n])); + + size += sprintf(&buf[size], "Allocated:\n"); + + for (n = 0; n < dd->slot_groups; n++) { + if (sizeof(long) > sizeof(u32)) + group_allocated = + dd->port->allocated[n/2] >> (32*(n&1)); + else + group_allocated = dd->port->allocated[n]; + size += sprintf(&buf[size], "0x%08x\n", + group_allocated); + } + + size += sprintf(&buf[size], "completed:\n"); + + for (n = 0; n < dd->slot_groups; n++) + size += sprintf(&buf[size], "0x%08x\n", + readl(dd->port->completed[n])); + + size += sprintf(&buf[size], "PORT_IRQ_STAT 0x%08x\n", + readl(dd->port->mmio + PORT_IRQ_STAT)); + size += sprintf(&buf[size], "HOST_IRQ_STAT 0x%08x\n", + readl(dd->mmio + HOST_IRQ_STAT)); + + return size; +} +static DEVICE_ATTR(registers, S_IRUGO, hw_show_registers, NULL); + +/* + * Create the sysfs related attributes. + * + * @dd Pointer to the driver data structure. + * @kobj Pointer to the kobj for the block device. + * + * return value + * 0 Operation completed successfully. + * -EINVAL Invalid parameter. + */ +static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj) +{ + if (!kobj || !dd) + return -EINVAL; + + if (sysfs_create_file(kobj, &dev_attr_registers.attr)) + dev_warn(&dd->pdev->dev, + "Error creating registers sysfs entry\n"); + return 0; +} + +/* + * Remove the sysfs related attributes. + * + * @dd Pointer to the driver data structure. + * @kobj Pointer to the kobj for the block device. + * + * return value + * 0 Operation completed successfully. + * -EINVAL Invalid parameter. + */ +static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj) +{ + if (!kobj || !dd) + return -EINVAL; + + sysfs_remove_file(kobj, &dev_attr_registers.attr); + + return 0; +} + +/* + * Perform any init/resume time hardware setup + * + * @dd Pointer to the driver data structure. + * + * return value + * None + */ +static inline void hba_setup(struct driver_data *dd) +{ + u32 hwdata; + hwdata = readl(dd->mmio + HOST_HSORG); + + /* interrupt bug workaround: use only 1 IS bit.*/ + writel(hwdata | + HSORG_DISABLE_SLOTGRP_INTR | + HSORG_DISABLE_SLOTGRP_PXIS, + dd->mmio + HOST_HSORG); +} + +/* + * Detect the details of the product, and store anything needed + * into the driver data structure. This includes product type and + * version and number of slot groups. + * + * @dd Pointer to the driver data structure. + * + * return value + * None + */ +static void mtip_detect_product(struct driver_data *dd) +{ + u32 hwdata; + unsigned int rev, slotgroups; + + /* + * HBA base + 0xFC [15:0] - vendor-specific hardware interface + * info register: + * [15:8] hardware/software interface rev# + * [ 3] asic-style interface + * [ 2:0] number of slot groups, minus 1 (only valid for asic-style). + */ + hwdata = readl(dd->mmio + HOST_HSORG); + + dd->product_type = MTIP_PRODUCT_UNKNOWN; + dd->slot_groups = 1; + + if (hwdata & 0x8) { + dd->product_type = MTIP_PRODUCT_ASICFPGA; + rev = (hwdata & HSORG_HWREV) >> 8; + slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1; + dev_info(&dd->pdev->dev, + "ASIC-FPGA design, HS rev 0x%x, " + "%i slot groups [%i slots]\n", + rev, + slotgroups, + slotgroups * 32); + + if (slotgroups > MTIP_MAX_SLOT_GROUPS) { + dev_warn(&dd->pdev->dev, + "Warning: driver only supports " + "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS); + slotgroups = MTIP_MAX_SLOT_GROUPS; + } + dd->slot_groups = slotgroups; + return; + } + + dev_warn(&dd->pdev->dev, "Unrecognized product id\n"); +} + +/* + * Blocking wait for FTL rebuild to complete + * + * @dd Pointer to the DRIVER_DATA structure. + * + * return value + * 0 FTL rebuild completed successfully + * -EFAULT FTL rebuild error/timeout/interruption + */ +static int mtip_ftl_rebuild_poll(struct driver_data *dd) +{ + unsigned long timeout, cnt = 0, start; + + dev_warn(&dd->pdev->dev, + "FTL rebuild in progress. Polling for completion.\n"); + + start = jiffies; + dd->ftlrebuildflag = 1; + timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS); + + do { + if (mtip_check_surprise_removal(dd->pdev)) + return -EFAULT; + + if (mtip_get_identify(dd->port, NULL) < 0) + return -EFAULT; + + if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) == + MTIP_FTL_REBUILD_MAGIC) { + ssleep(1); + /* Print message every 3 minutes */ + if (cnt++ >= 180) { + dev_warn(&dd->pdev->dev, + "FTL rebuild in progress (%d secs).\n", + jiffies_to_msecs(jiffies - start) / 1000); + cnt = 0; + } + } else { + dev_warn(&dd->pdev->dev, + "FTL rebuild complete (%d secs).\n", + jiffies_to_msecs(jiffies - start) / 1000); + dd->ftlrebuildflag = 0; + mtip_block_initialize(dd); + break; + } + ssleep(10); + } while (time_before(jiffies, timeout)); + + /* Check for timeout */ + if (dd->ftlrebuildflag) { + dev_err(&dd->pdev->dev, + "Timed out waiting for FTL rebuild to complete (%d secs).\n", + jiffies_to_msecs(jiffies - start) / 1000); + return -EFAULT; + } + + return 0; +} + +/* + * service thread to issue queued commands + * + * @data Pointer to the driver data structure. + * + * return value + * 0 + */ + +static int mtip_service_thread(void *data) +{ + struct driver_data *dd = (struct driver_data *)data; + unsigned long slot, slot_start, slot_wrap; + unsigned int num_cmd_slots = dd->slot_groups * 32; + struct mtip_port *port = dd->port; + + while (1) { + /* + * the condition is to check neither an internal command is + * is in progress nor error handling is active + */ + wait_event_interruptible(port->svc_wait, (port->flags) && + !test_bit(MTIP_FLAG_IC_ACTIVE_BIT, &port->flags) && + !test_bit(MTIP_FLAG_EH_ACTIVE_BIT, &port->flags)); + + if (kthread_should_stop()) + break; + + set_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags); + if (test_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags)) { + slot = 1; + /* used to restrict the loop to one iteration */ + slot_start = num_cmd_slots; + slot_wrap = 0; + while (1) { + slot = find_next_bit(port->cmds_to_issue, + num_cmd_slots, slot); + if (slot_wrap == 1) { + if ((slot_start >= slot) || + (slot >= num_cmd_slots)) + break; + } + if (unlikely(slot_start == num_cmd_slots)) + slot_start = slot; + + if (unlikely(slot == num_cmd_slots)) { + slot = 1; + slot_wrap = 1; + continue; + } + + /* Issue the command to the hardware */ + mtip_issue_ncq_command(port, slot); + + /* Set the command's timeout value.*/ + port->commands[slot].comp_time = jiffies + + msecs_to_jiffies(MTIP_NCQ_COMMAND_TIMEOUT_MS); + + clear_bit(slot, port->cmds_to_issue); + } + + clear_bit(MTIP_FLAG_ISSUE_CMDS_BIT, &port->flags); + } else if (test_bit(MTIP_FLAG_REBUILD_BIT, &port->flags)) { + mtip_ftl_rebuild_poll(dd); + clear_bit(MTIP_FLAG_REBUILD_BIT, &port->flags); + } + clear_bit(MTIP_FLAG_SVC_THD_ACTIVE_BIT, &port->flags); + + if (test_bit(MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT, &port->flags)) + break; + } + return 0; +} + +/* + * Called once for each card. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 on success, else an error code. + */ +static int mtip_hw_init(struct driver_data *dd) +{ + int i; + int rv; + unsigned int num_command_slots; + + dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR]; + + mtip_detect_product(dd); + if (dd->product_type == MTIP_PRODUCT_UNKNOWN) { + rv = -EIO; + goto out1; + } + num_command_slots = dd->slot_groups * 32; + + hba_setup(dd); + + tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd); + + dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL); + if (!dd->port) { + dev_err(&dd->pdev->dev, + "Memory allocation: port structure\n"); + return -ENOMEM; + } + + /* Counting semaphore to track command slot usage */ + sema_init(&dd->port->cmd_slot, num_command_slots - 1); + + /* Spinlock to prevent concurrent issue */ + spin_lock_init(&dd->port->cmd_issue_lock); + + /* Set the port mmio base address. */ + dd->port->mmio = dd->mmio + PORT_OFFSET; + dd->port->dd = dd; + + /* Allocate memory for the command list. */ + dd->port->command_list = + dmam_alloc_coherent(&dd->pdev->dev, + HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2), + &dd->port->command_list_dma, + GFP_KERNEL); + if (!dd->port->command_list) { + dev_err(&dd->pdev->dev, + "Memory allocation: command list\n"); + rv = -ENOMEM; + goto out1; + } + + /* Clear the memory we have allocated. */ + memset(dd->port->command_list, + 0, + HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2)); + + /* Setup the addresse of the RX FIS. */ + dd->port->rxfis = dd->port->command_list + HW_CMD_SLOT_SZ; + dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ; + + /* Setup the address of the command tables. */ + dd->port->command_table = dd->port->rxfis + AHCI_RX_FIS_SZ; + dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ; + + /* Setup the address of the identify data. */ + dd->port->identify = dd->port->command_table + + HW_CMD_TBL_AR_SZ; + dd->port->identify_dma = dd->port->command_tbl_dma + + HW_CMD_TBL_AR_SZ; + + /* Setup the address of the sector buffer. */ + dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE; + dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE; + + /* Point the command headers at the command tables. */ + for (i = 0; i < num_command_slots; i++) { + dd->port->commands[i].command_header = + dd->port->command_list + + (sizeof(struct mtip_cmd_hdr) * i); + dd->port->commands[i].command_header_dma = + dd->port->command_list_dma + + (sizeof(struct mtip_cmd_hdr) * i); + + dd->port->commands[i].command = + dd->port->command_table + (HW_CMD_TBL_SZ * i); + dd->port->commands[i].command_dma = + dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i); + + if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64) + dd->port->commands[i].command_header->ctbau = + __force_bit2int cpu_to_le32( + (dd->port->commands[i].command_dma >> 16) >> 16); + dd->port->commands[i].command_header->ctba = + __force_bit2int cpu_to_le32( + dd->port->commands[i].command_dma & 0xFFFFFFFF); + + /* + * If this is not done, a bug is reported by the stock + * FC11 i386. Due to the fact that it has lots of kernel + * debugging enabled. + */ + sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG); + + /* Mark all commands as currently inactive.*/ + atomic_set(&dd->port->commands[i].active, 0); + } + + /* Setup the pointers to the extended s_active and CI registers. */ + for (i = 0; i < dd->slot_groups; i++) { + dd->port->s_active[i] = + dd->port->mmio + i*0x80 + PORT_SCR_ACT; + dd->port->cmd_issue[i] = + dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE; + dd->port->completed[i] = + dd->port->mmio + i*0x80 + PORT_SDBV; + } + + /* Reset the HBA. */ + if (mtip_hba_reset(dd) < 0) { + dev_err(&dd->pdev->dev, + "Card did not reset within timeout\n"); + rv = -EIO; + goto out2; + } + + mtip_init_port(dd->port); + mtip_start_port(dd->port); + + /* Setup the ISR and enable interrupts. */ + rv = devm_request_irq(&dd->pdev->dev, + dd->pdev->irq, + mtip_irq_handler, + IRQF_SHARED, + dev_driver_string(&dd->pdev->dev), + dd); + + if (rv) { + dev_err(&dd->pdev->dev, + "Unable to allocate IRQ %d\n", dd->pdev->irq); + goto out2; + } + + /* Enable interrupts on the HBA. */ + writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN, + dd->mmio + HOST_CTL); + + init_timer(&dd->port->cmd_timer); + init_waitqueue_head(&dd->port->svc_wait); + + dd->port->cmd_timer.data = (unsigned long int) dd->port; + dd->port->cmd_timer.function = mtip_timeout_function; + mod_timer(&dd->port->cmd_timer, + jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD)); + + if (mtip_get_identify(dd->port, NULL) < 0) { + rv = -EFAULT; + goto out3; + } + + if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) == + MTIP_FTL_REBUILD_MAGIC) { + set_bit(MTIP_FLAG_REBUILD_BIT, &dd->port->flags); + return MTIP_FTL_REBUILD_MAGIC; + } + mtip_dump_identify(dd->port); + return rv; + +out3: + del_timer_sync(&dd->port->cmd_timer); + + /* Disable interrupts on the HBA. */ + writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN, + dd->mmio + HOST_CTL); + + /*Release the IRQ. */ + devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd); + +out2: + mtip_deinit_port(dd->port); + + /* Free the command/command header memory. */ + dmam_free_coherent(&dd->pdev->dev, + HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2), + dd->port->command_list, + dd->port->command_list_dma); +out1: + /* Free the memory allocated for the for structure. */ + kfree(dd->port); + + return rv; +} + +/* + * Called to deinitialize an interface. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 + */ +static int mtip_hw_exit(struct driver_data *dd) +{ + /* + * Send standby immediate (E0h) to the drive so that it + * saves its state. + */ + if (atomic_read(&dd->drv_cleanup_done) != true) { + + mtip_standby_immediate(dd->port); + + /* de-initialize the port. */ + mtip_deinit_port(dd->port); + + /* Disable interrupts on the HBA. */ + writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN, + dd->mmio + HOST_CTL); + } + + del_timer_sync(&dd->port->cmd_timer); + + /* Release the IRQ. */ + devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd); + + /* Stop the bottom half tasklet. */ + tasklet_kill(&dd->tasklet); + + /* Free the command/command header memory. */ + dmam_free_coherent(&dd->pdev->dev, + HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 2), + dd->port->command_list, + dd->port->command_list_dma); + /* Free the memory allocated for the for structure. */ + kfree(dd->port); + + return 0; +} + +/* + * Issue a Standby Immediate command to the device. + * + * This function is called by the Block Layer just before the + * system powers off during a shutdown. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 + */ +static int mtip_hw_shutdown(struct driver_data *dd) +{ + /* + * Send standby immediate (E0h) to the drive so that it + * saves its state. + */ + mtip_standby_immediate(dd->port); + + return 0; +} + +/* + * Suspend function + * + * This function is called by the Block Layer just before the + * system hibernates. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 Suspend was successful + * -EFAULT Suspend was not successful + */ +static int mtip_hw_suspend(struct driver_data *dd) +{ + /* + * Send standby immediate (E0h) to the drive + * so that it saves its state. + */ + if (mtip_standby_immediate(dd->port) != 0) { + dev_err(&dd->pdev->dev, + "Failed standby-immediate command\n"); + return -EFAULT; + } + + /* Disable interrupts on the HBA.*/ + writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN, + dd->mmio + HOST_CTL); + mtip_deinit_port(dd->port); + + return 0; +} + +/* + * Resume function + * + * This function is called by the Block Layer as the + * system resumes. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 Resume was successful + * -EFAULT Resume was not successful + */ +static int mtip_hw_resume(struct driver_data *dd) +{ + /* Perform any needed hardware setup steps */ + hba_setup(dd); + + /* Reset the HBA */ + if (mtip_hba_reset(dd) != 0) { + dev_err(&dd->pdev->dev, + "Unable to reset the HBA\n"); + return -EFAULT; + } + + /* + * Enable the port, DMA engine, and FIS reception specific + * h/w in controller. + */ + mtip_init_port(dd->port); + mtip_start_port(dd->port); + + /* Enable interrupts on the HBA.*/ + writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN, + dd->mmio + HOST_CTL); + + return 0; +} + +/* + * Helper function for reusing disk name + * upon hot insertion. + */ +static int rssd_disk_name_format(char *prefix, + int index, + char *buf, + int buflen) +{ + const int base = 'z' - 'a' + 1; + char *begin = buf + strlen(prefix); + char *end = buf + buflen; + char *p; + int unit; + + p = end - 1; + *p = '\0'; + unit = base; + do { + if (p == begin) + return -EINVAL; + *--p = 'a' + (index % unit); + index = (index / unit) - 1; + } while (index >= 0); + + memmove(begin, p, end - p); + memcpy(buf, prefix, strlen(prefix)); + + return 0; +} + +/* + * Block layer IOCTL handler. + * + * @dev Pointer to the block_device structure. + * @mode ignored + * @cmd IOCTL command passed from the user application. + * @arg Argument passed from the user application. + * + * return value + * 0 IOCTL completed successfully. + * -ENOTTY IOCTL not supported or invalid driver data + * structure pointer. + */ +static int mtip_block_ioctl(struct block_device *dev, + fmode_t mode, + unsigned cmd, + unsigned long arg) +{ + struct driver_data *dd = dev->bd_disk->private_data; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (!dd) + return -ENOTTY; + + switch (cmd) { + case BLKFLSBUF: + return -ENOTTY; + default: + return mtip_hw_ioctl(dd, cmd, arg); + } +} + +#ifdef CONFIG_COMPAT +/* + * Block layer compat IOCTL handler. + * + * @dev Pointer to the block_device structure. + * @mode ignored + * @cmd IOCTL command passed from the user application. + * @arg Argument passed from the user application. + * + * return value + * 0 IOCTL completed successfully. + * -ENOTTY IOCTL not supported or invalid driver data + * structure pointer. + */ +static int mtip_block_compat_ioctl(struct block_device *dev, + fmode_t mode, + unsigned cmd, + unsigned long arg) +{ + struct driver_data *dd = dev->bd_disk->private_data; + + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + + if (!dd) + return -ENOTTY; + + switch (cmd) { + case BLKFLSBUF: + return -ENOTTY; + case HDIO_DRIVE_TASKFILE: { + struct mtip_compat_ide_task_request_s __user *compat_req_task; + ide_task_request_t req_task; + int compat_tasksize, outtotal, ret; + + compat_tasksize = + sizeof(struct mtip_compat_ide_task_request_s); + + compat_req_task = + (struct mtip_compat_ide_task_request_s __user *) arg; + + if (copy_from_user(&req_task, (void __user *) arg, + compat_tasksize - (2 * sizeof(compat_long_t)))) + return -EFAULT; + + if (get_user(req_task.out_size, &compat_req_task->out_size)) + return -EFAULT; + + if (get_user(req_task.in_size, &compat_req_task->in_size)) + return -EFAULT; + + outtotal = sizeof(struct mtip_compat_ide_task_request_s); + + ret = exec_drive_taskfile(dd, (void __user *) arg, + &req_task, outtotal); + + if (copy_to_user((void __user *) arg, &req_task, + compat_tasksize - + (2 * sizeof(compat_long_t)))) + return -EFAULT; + + if (put_user(req_task.out_size, &compat_req_task->out_size)) + return -EFAULT; + + if (put_user(req_task.in_size, &compat_req_task->in_size)) + return -EFAULT; + + return ret; + } + default: + return mtip_hw_ioctl(dd, cmd, arg); + } +} +#endif + +/* + * Obtain the geometry of the device. + * + * You may think that this function is obsolete, but some applications, + * fdisk for example still used CHS values. This function describes the + * device as having 224 heads and 56 sectors per cylinder. These values are + * chosen so that each cylinder is aligned on a 4KB boundary. Since a + * partition is described in terms of a start and end cylinder this means + * that each partition is also 4KB aligned. Non-aligned partitions adversely + * affects performance. + * + * @dev Pointer to the block_device strucutre. + * @geo Pointer to a hd_geometry structure. + * + * return value + * 0 Operation completed successfully. + * -ENOTTY An error occurred while reading the drive capacity. + */ +static int mtip_block_getgeo(struct block_device *dev, + struct hd_geometry *geo) +{ + struct driver_data *dd = dev->bd_disk->private_data; + sector_t capacity; + + if (!dd) + return -ENOTTY; + + if (!(mtip_hw_get_capacity(dd, &capacity))) { + dev_warn(&dd->pdev->dev, + "Could not get drive capacity.\n"); + return -ENOTTY; + } + + geo->heads = 224; + geo->sectors = 56; + sector_div(capacity, (geo->heads * geo->sectors)); + geo->cylinders = capacity; + return 0; +} + +/* + * Block device operation function. + * + * This structure contains pointers to the functions required by the block + * layer. + */ +static const struct block_device_operations mtip_block_ops = { + .ioctl = mtip_block_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = mtip_block_compat_ioctl, +#endif + .getgeo = mtip_block_getgeo, + .owner = THIS_MODULE +}; + +/* + * Block layer make request function. + * + * This function is called by the kernel to process a BIO for + * the P320 device. + * + * @queue Pointer to the request queue. Unused other than to obtain + * the driver data structure. + * @bio Pointer to the BIO. + * + */ +static void mtip_make_request(struct request_queue *queue, struct bio *bio) +{ + struct driver_data *dd = queue->queuedata; + struct scatterlist *sg; + struct bio_vec *bvec; + int nents = 0; + int tag = 0; + + if (unlikely(!bio_has_data(bio))) { + blk_queue_flush(queue, 0); + bio_endio(bio, 0); + return; + } + + sg = mtip_hw_get_scatterlist(dd, &tag); + if (likely(sg != NULL)) { + blk_queue_bounce(queue, &bio); + + if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) { + dev_warn(&dd->pdev->dev, + "Maximum number of SGL entries exceeded"); + bio_io_error(bio); + mtip_hw_release_scatterlist(dd, tag); + return; + } + + /* Create the scatter list for this bio. */ + bio_for_each_segment(bvec, bio, nents) { + sg_set_page(&sg[nents], + bvec->bv_page, + bvec->bv_len, + bvec->bv_offset); + } + + /* Issue the read/write. */ + mtip_hw_submit_io(dd, + bio->bi_sector, + bio_sectors(bio), + nents, + tag, + bio_endio, + bio, + bio->bi_rw & REQ_FUA, + bio_data_dir(bio)); + } else + bio_io_error(bio); +} + +/* + * Block layer initialization function. + * + * This function is called once by the PCI layer for each P320 + * device that is connected to the system. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 on success else an error code. + */ +static int mtip_block_initialize(struct driver_data *dd) +{ + int rv = 0, wait_for_rebuild = 0; + sector_t capacity; + unsigned int index = 0; + struct kobject *kobj; + unsigned char thd_name[16]; + + if (dd->disk) + goto skip_create_disk; /* hw init done, before rebuild */ + + /* Initialize the protocol layer. */ + wait_for_rebuild = mtip_hw_init(dd); + if (wait_for_rebuild < 0) { + dev_err(&dd->pdev->dev, + "Protocol layer initialization failed\n"); + rv = -EINVAL; + goto protocol_init_error; + } + + dd->disk = alloc_disk(MTIP_MAX_MINORS); + if (dd->disk == NULL) { + dev_err(&dd->pdev->dev, + "Unable to allocate gendisk structure\n"); + rv = -EINVAL; + goto alloc_disk_error; + } + + /* Generate the disk name, implemented same as in sd.c */ + do { + if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL)) + goto ida_get_error; + + spin_lock(&rssd_index_lock); + rv = ida_get_new(&rssd_index_ida, &index); + spin_unlock(&rssd_index_lock); + } while (rv == -EAGAIN); + + if (rv) + goto ida_get_error; + + rv = rssd_disk_name_format("rssd", + index, + dd->disk->disk_name, + DISK_NAME_LEN); + if (rv) + goto disk_index_error; + + dd->disk->driverfs_dev = &dd->pdev->dev; + dd->disk->major = dd->major; + dd->disk->first_minor = dd->instance * MTIP_MAX_MINORS; + dd->disk->fops = &mtip_block_ops; + dd->disk->private_data = dd; + dd->index = index; + + /* + * if rebuild pending, start the service thread, and delay the block + * queue creation and add_disk() + */ + if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC) + goto start_service_thread; + +skip_create_disk: + /* Allocate the request queue. */ + dd->queue = blk_alloc_queue(GFP_KERNEL); + if (dd->queue == NULL) { + dev_err(&dd->pdev->dev, + "Unable to allocate request queue\n"); + rv = -ENOMEM; + goto block_queue_alloc_init_error; + } + + /* Attach our request function to the request queue. */ + blk_queue_make_request(dd->queue, mtip_make_request); + + dd->disk->queue = dd->queue; + dd->queue->queuedata = dd; + + /* Set device limits. */ + set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags); + blk_queue_max_segments(dd->queue, MTIP_MAX_SG); + blk_queue_physical_block_size(dd->queue, 4096); + blk_queue_io_min(dd->queue, 4096); + blk_queue_flush(dd->queue, 0); + + /* Set the capacity of the device in 512 byte sectors. */ + if (!(mtip_hw_get_capacity(dd, &capacity))) { + dev_warn(&dd->pdev->dev, + "Could not read drive capacity\n"); + rv = -EIO; + goto read_capacity_error; + } + set_capacity(dd->disk, capacity); + + /* Enable the block device and add it to /dev */ + add_disk(dd->disk); + + /* + * Now that the disk is active, initialize any sysfs attributes + * managed by the protocol layer. + */ + kobj = kobject_get(&disk_to_dev(dd->disk)->kobj); + if (kobj) { + mtip_hw_sysfs_init(dd, kobj); + kobject_put(kobj); + } + + if (dd->mtip_svc_handler) + return rv; /* service thread created for handling rebuild */ + +start_service_thread: + sprintf(thd_name, "mtip_svc_thd_%02d", index); + + dd->mtip_svc_handler = kthread_run(mtip_service_thread, + dd, thd_name); + + if (IS_ERR(dd->mtip_svc_handler)) { + printk(KERN_ERR "mtip32xx: service thread failed to start\n"); + dd->mtip_svc_handler = NULL; + rv = -EFAULT; + goto kthread_run_error; + } + + return rv; + +kthread_run_error: + /* Delete our gendisk. This also removes the device from /dev */ + del_gendisk(dd->disk); + +read_capacity_error: + blk_cleanup_queue(dd->queue); + +block_queue_alloc_init_error: +disk_index_error: + spin_lock(&rssd_index_lock); + ida_remove(&rssd_index_ida, index); + spin_unlock(&rssd_index_lock); + +ida_get_error: + put_disk(dd->disk); + +alloc_disk_error: + mtip_hw_exit(dd); /* De-initialize the protocol layer. */ + +protocol_init_error: + return rv; +} + +/* + * Block layer deinitialization function. + * + * Called by the PCI layer as each P320 device is removed. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 + */ +static int mtip_block_remove(struct driver_data *dd) +{ + struct kobject *kobj; + + if (dd->mtip_svc_handler) { + set_bit(MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT, &dd->port->flags); + wake_up_interruptible(&dd->port->svc_wait); + kthread_stop(dd->mtip_svc_handler); + } + + /* Clean up the sysfs attributes managed by the protocol layer. */ + kobj = kobject_get(&disk_to_dev(dd->disk)->kobj); + if (kobj) { + mtip_hw_sysfs_exit(dd, kobj); + kobject_put(kobj); + } + + /* + * Delete our gendisk structure. This also removes the device + * from /dev + */ + del_gendisk(dd->disk); + blk_cleanup_queue(dd->queue); + dd->disk = NULL; + dd->queue = NULL; + + /* De-initialize the protocol layer. */ + mtip_hw_exit(dd); + + return 0; +} + +/* + * Function called by the PCI layer when just before the + * machine shuts down. + * + * If a protocol layer shutdown function is present it will be called + * by this function. + * + * @dd Pointer to the driver data structure. + * + * return value + * 0 + */ +static int mtip_block_shutdown(struct driver_data *dd) +{ + dev_info(&dd->pdev->dev, + "Shutting down %s ...\n", dd->disk->disk_name); + + /* Delete our gendisk structure, and cleanup the blk queue. */ + del_gendisk(dd->disk); + blk_cleanup_queue(dd->queue); + dd->disk = NULL; + dd->queue = NULL; + + mtip_hw_shutdown(dd); + return 0; +} + +static int mtip_block_suspend(struct driver_data *dd) +{ + dev_info(&dd->pdev->dev, + "Suspending %s ...\n", dd->disk->disk_name); + mtip_hw_suspend(dd); + return 0; +} + +static int mtip_block_resume(struct driver_data *dd) +{ + dev_info(&dd->pdev->dev, "Resuming %s ...\n", + dd->disk->disk_name); + mtip_hw_resume(dd); + return 0; +} + +/* + * Called for each supported PCI device detected. + * + * This function allocates the private data structure, enables the + * PCI device and then calls the block layer initialization function. + * + * return value + * 0 on success else an error code. + */ +static int mtip_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + int rv = 0; + struct driver_data *dd = NULL; + + /* Allocate memory for this devices private data. */ + dd = kzalloc(sizeof(struct driver_data), GFP_KERNEL); + if (dd == NULL) { + dev_err(&pdev->dev, + "Unable to allocate memory for driver data\n"); + return -ENOMEM; + } + + /* Set the atomic variable as 1 in case of SRSI */ + atomic_set(&dd->drv_cleanup_done, true); + + atomic_set(&dd->resumeflag, false); + + /* Attach the private data to this PCI device. */ + pci_set_drvdata(pdev, dd); + + rv = pcim_enable_device(pdev); + if (rv < 0) { + dev_err(&pdev->dev, "Unable to enable device\n"); + goto iomap_err; + } + + /* Map BAR5 to memory. */ + rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME); + if (rv < 0) { + dev_err(&pdev->dev, "Unable to map regions\n"); + goto iomap_err; + } + + if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) { + rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); + + if (rv) { + rv = pci_set_consistent_dma_mask(pdev, + DMA_BIT_MASK(32)); + if (rv) { + dev_warn(&pdev->dev, + "64-bit DMA enable failed\n"); + goto setmask_err; + } + } + } + + pci_set_master(pdev); + + if (pci_enable_msi(pdev)) { + dev_warn(&pdev->dev, + "Unable to enable MSI interrupt.\n"); + goto block_initialize_err; + } + + /* Copy the info we may need later into the private data structure. */ + dd->major = mtip_major; + dd->instance = instance; + dd->pdev = pdev; + + /* Initialize the block layer. */ + rv = mtip_block_initialize(dd); + if (rv < 0) { + dev_err(&pdev->dev, + "Unable to initialize block layer\n"); + goto block_initialize_err; + } + + /* + * Increment the instance count so that each device has a unique + * instance number. + */ + instance++; + + goto done; + +block_initialize_err: + pci_disable_msi(pdev); + +setmask_err: + pcim_iounmap_regions(pdev, 1 << MTIP_ABAR); + +iomap_err: + kfree(dd); + pci_set_drvdata(pdev, NULL); + return rv; +done: + /* Set the atomic variable as 0 in case of SRSI */ + atomic_set(&dd->drv_cleanup_done, true); + + return rv; +} + +/* + * Called for each probed device when the device is removed or the + * driver is unloaded. + * + * return value + * None + */ +static void mtip_pci_remove(struct pci_dev *pdev) +{ + struct driver_data *dd = pci_get_drvdata(pdev); + int counter = 0; + + if (mtip_check_surprise_removal(pdev)) { + while (atomic_read(&dd->drv_cleanup_done) == false) { + counter++; + msleep(20); + if (counter == 10) { + /* Cleanup the outstanding commands */ + mtip_command_cleanup(dd); + break; + } + } + } + /* Set the atomic variable as 1 in case of SRSI */ + atomic_set(&dd->drv_cleanup_done, true); + + /* Clean up the block layer. */ + mtip_block_remove(dd); + + pci_disable_msi(pdev); + + kfree(dd); + pcim_iounmap_regions(pdev, 1 << MTIP_ABAR); +} + +/* + * Called for each probed device when the device is suspended. + * + * return value + * 0 Success + * <0 Error + */ +static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg) +{ + int rv = 0; + struct driver_data *dd = pci_get_drvdata(pdev); + + if (!dd) { + dev_err(&pdev->dev, + "Driver private datastructure is NULL\n"); + return -EFAULT; + } + + atomic_set(&dd->resumeflag, true); + + /* Disable ports & interrupts then send standby immediate */ + rv = mtip_block_suspend(dd); + if (rv < 0) { + dev_err(&pdev->dev, + "Failed to suspend controller\n"); + return rv; + } + + /* + * Save the pci config space to pdev structure & + * disable the device + */ + pci_save_state(pdev); + pci_disable_device(pdev); + + /* Move to Low power state*/ + pci_set_power_state(pdev, PCI_D3hot); + + return rv; +} + +/* + * Called for each probed device when the device is resumed. + * + * return value + * 0 Success + * <0 Error + */ +static int mtip_pci_resume(struct pci_dev *pdev) +{ + int rv = 0; + struct driver_data *dd; + + dd = pci_get_drvdata(pdev); + if (!dd) { + dev_err(&pdev->dev, + "Driver private datastructure is NULL\n"); + return -EFAULT; + } + + /* Move the device to active State */ + pci_set_power_state(pdev, PCI_D0); + + /* Restore PCI configuration space */ + pci_restore_state(pdev); + + /* Enable the PCI device*/ + rv = pcim_enable_device(pdev); + if (rv < 0) { + dev_err(&pdev->dev, + "Failed to enable card during resume\n"); + goto err; + } + pci_set_master(pdev); + + /* + * Calls hbaReset, initPort, & startPort function + * then enables interrupts + */ + rv = mtip_block_resume(dd); + if (rv < 0) + dev_err(&pdev->dev, "Unable to resume\n"); + +err: + atomic_set(&dd->resumeflag, false); + + return rv; +} + +/* + * Shutdown routine + * + * return value + * None + */ +static void mtip_pci_shutdown(struct pci_dev *pdev) +{ + struct driver_data *dd = pci_get_drvdata(pdev); + if (dd) + mtip_block_shutdown(dd); +} + +/* Table of device ids supported by this driver. */ +static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = { + { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320_DEVICE_ID) }, + { 0 } +}; + +/* Structure that describes the PCI driver functions. */ +static struct pci_driver mtip_pci_driver = { + .name = MTIP_DRV_NAME, + .id_table = mtip_pci_tbl, + .probe = mtip_pci_probe, + .remove = mtip_pci_remove, + .suspend = mtip_pci_suspend, + .resume = mtip_pci_resume, + .shutdown = mtip_pci_shutdown, +}; + +MODULE_DEVICE_TABLE(pci, mtip_pci_tbl); + +/* + * Module initialization function. + * + * Called once when the module is loaded. This function allocates a major + * block device number to the Cyclone devices and registers the PCI layer + * of the driver. + * + * Return value + * 0 on success else error code. + */ +static int __init mtip_init(void) +{ + printk(KERN_INFO MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n"); + + /* Allocate a major block device number to use with this driver. */ + mtip_major = register_blkdev(0, MTIP_DRV_NAME); + if (mtip_major < 0) { + printk(KERN_ERR "Unable to register block device (%d)\n", + mtip_major); + return -EBUSY; + } + + /* Register our PCI operations. */ + return pci_register_driver(&mtip_pci_driver); +} + +/* + * Module de-initialization function. + * + * Called once when the module is unloaded. This function deallocates + * the major block device number allocated by mtip_init() and + * unregisters the PCI layer of the driver. + * + * Return value + * none + */ +static void __exit mtip_exit(void) +{ + /* Release the allocated major block device number. */ + unregister_blkdev(mtip_major, MTIP_DRV_NAME); + + /* Unregister the PCI driver. */ + pci_unregister_driver(&mtip_pci_driver); +} + +MODULE_AUTHOR("Micron Technology, Inc"); +MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver"); +MODULE_LICENSE("GPL"); +MODULE_VERSION(MTIP_DRV_VERSION); + +module_init(mtip_init); +module_exit(mtip_exit); diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h new file mode 100644 index 000000000000..723d7c4946dc --- /dev/null +++ b/drivers/block/mtip32xx/mtip32xx.h @@ -0,0 +1,423 @@ +/* + * mtip32xx.h - Header file for the P320 SSD Block Driver + * Copyright (C) 2011 Micron Technology, Inc. + * + * Portions of this code were derived from works subjected to the + * following copyright: + * Copyright (C) 2009 Integrated Device Technology, Inc. + * + * 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 of the License, 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. + * + */ + +#ifndef __MTIP32XX_H__ +#define __MTIP32XX_H__ + +#include <linux/spinlock.h> +#include <linux/rwsem.h> +#include <linux/ata.h> +#include <linux/interrupt.h> +#include <linux/genhd.h> +#include <linux/version.h> + +/* Offset of Subsystem Device ID in pci confoguration space */ +#define PCI_SUBSYSTEM_DEVICEID 0x2E + +/* offset of Device Control register in PCIe extended capabilites space */ +#define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET 0x48 + +/* # of times to retry timed out IOs */ +#define MTIP_MAX_RETRIES 5 + +/* Various timeout values in ms */ +#define MTIP_NCQ_COMMAND_TIMEOUT_MS 5000 +#define MTIP_IOCTL_COMMAND_TIMEOUT_MS 5000 +#define MTIP_INTERNAL_COMMAND_TIMEOUT_MS 5000 + +/* check for timeouts every 500ms */ +#define MTIP_TIMEOUT_CHECK_PERIOD 500 + +/* ftl rebuild */ +#define MTIP_FTL_REBUILD_OFFSET 142 +#define MTIP_FTL_REBUILD_MAGIC 0xED51 +#define MTIP_FTL_REBUILD_TIMEOUT_MS 2400000 + +/* Macro to extract the tag bit number from a tag value. */ +#define MTIP_TAG_BIT(tag) (tag & 0x1F) + +/* + * Macro to extract the tag index from a tag value. The index + * is used to access the correct s_active/Command Issue register based + * on the tag value. + */ +#define MTIP_TAG_INDEX(tag) (tag >> 5) + +/* + * Maximum number of scatter gather entries + * a single command may have. + */ +#define MTIP_MAX_SG 128 + +/* + * Maximum number of slot groups (Command Issue & s_active registers) + * NOTE: This is the driver maximum; check dd->slot_groups for actual value. + */ +#define MTIP_MAX_SLOT_GROUPS 8 + +/* Internal command tag. */ +#define MTIP_TAG_INTERNAL 0 + +/* Micron Vendor ID & P320x SSD Device ID */ +#define PCI_VENDOR_ID_MICRON 0x1344 +#define P320_DEVICE_ID 0x5150 + +/* Driver name and version strings */ +#define MTIP_DRV_NAME "mtip32xx" +#define MTIP_DRV_VERSION "1.2.6os3" + +/* Maximum number of minor device numbers per device. */ +#define MTIP_MAX_MINORS 16 + +/* Maximum number of supported command slots. */ +#define MTIP_MAX_COMMAND_SLOTS (MTIP_MAX_SLOT_GROUPS * 32) + +/* + * Per-tag bitfield size in longs. + * Linux bit manipulation functions + * (i.e. test_and_set_bit, find_next_zero_bit) + * manipulate memory in longs, so we try to make the math work. + * take the slot groups and find the number of longs, rounding up. + * Careful! i386 and x86_64 use different size longs! + */ +#define U32_PER_LONG (sizeof(long) / sizeof(u32)) +#define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \ + (U32_PER_LONG-1))/U32_PER_LONG) + +/* BAR number used to access the HBA registers. */ +#define MTIP_ABAR 5 + +/* Forced Unit Access Bit */ +#define FUA_BIT 0x80 + +#ifdef DEBUG + #define dbg_printk(format, arg...) \ + printk(pr_fmt(format), ##arg); +#else + #define dbg_printk(format, arg...) +#endif + +#define __force_bit2int (unsigned int __force) + +/* below are bit numbers in 'flags' defined in mtip_port */ +#define MTIP_FLAG_IC_ACTIVE_BIT 0 +#define MTIP_FLAG_EH_ACTIVE_BIT 1 +#define MTIP_FLAG_SVC_THD_ACTIVE_BIT 2 +#define MTIP_FLAG_ISSUE_CMDS_BIT 4 +#define MTIP_FLAG_REBUILD_BIT 5 +#define MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT 8 + +/* Register Frame Information Structure (FIS), host to device. */ +struct host_to_dev_fis { + /* + * FIS type. + * - 27h Register FIS, host to device. + * - 34h Register FIS, device to host. + * - 39h DMA Activate FIS, device to host. + * - 41h DMA Setup FIS, bi-directional. + * - 46h Data FIS, bi-directional. + * - 58h BIST Activate FIS, bi-directional. + * - 5Fh PIO Setup FIS, device to host. + * - A1h Set Device Bits FIS, device to host. + */ + unsigned char type; + unsigned char opts; + unsigned char command; + unsigned char features; + + union { + unsigned char lba_low; + unsigned char sector; + }; + union { + unsigned char lba_mid; + unsigned char cyl_low; + }; + union { + unsigned char lba_hi; + unsigned char cyl_hi; + }; + union { + unsigned char device; + unsigned char head; + }; + + union { + unsigned char lba_low_ex; + unsigned char sector_ex; + }; + union { + unsigned char lba_mid_ex; + unsigned char cyl_low_ex; + }; + union { + unsigned char lba_hi_ex; + unsigned char cyl_hi_ex; + }; + unsigned char features_ex; + + unsigned char sect_count; + unsigned char sect_cnt_ex; + unsigned char res2; + unsigned char control; + + unsigned int res3; +}; + +/* Command header structure. */ +struct mtip_cmd_hdr { + /* + * Command options. + * - Bits 31:16 Number of PRD entries. + * - Bits 15:8 Unused in this implementation. + * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries. + * - Bit 6 Write bit, should be set when writing data to the device. + * - Bit 5 Unused in this implementation. + * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes). + */ + unsigned int opts; + /* This field is unsed when using NCQ. */ + union { + unsigned int byte_count; + unsigned int status; + }; + /* + * Lower 32 bits of the command table address associated with this + * header. The command table addresses must be 128 byte aligned. + */ + unsigned int ctba; + /* + * If 64 bit addressing is used this field is the upper 32 bits + * of the command table address associated with this command. + */ + unsigned int ctbau; + /* Reserved and unused. */ + unsigned int res[4]; +}; + +/* Command scatter gather structure (PRD). */ +struct mtip_cmd_sg { + /* + * Low 32 bits of the data buffer address. For P320 this + * address must be 8 byte aligned signified by bits 2:0 being + * set to 0. + */ + unsigned int dba; + /* + * When 64 bit addressing is used this field is the upper + * 32 bits of the data buffer address. + */ + unsigned int dba_upper; + /* Unused. */ + unsigned int reserved; + /* + * Bit 31: interrupt when this data block has been transferred. + * Bits 30..22: reserved + * Bits 21..0: byte count (minus 1). For P320 the byte count must be + * 8 byte aligned signified by bits 2:0 being set to 1. + */ + unsigned int info; +}; +struct mtip_port; + +/* Structure used to describe a command. */ +struct mtip_cmd { + + struct mtip_cmd_hdr *command_header; /* ptr to command header entry */ + + dma_addr_t command_header_dma; /* corresponding physical address */ + + void *command; /* ptr to command table entry */ + + dma_addr_t command_dma; /* corresponding physical address */ + + void *comp_data; /* data passed to completion function comp_func() */ + /* + * Completion function called by the ISR upon completion of + * a command. + */ + void (*comp_func)(struct mtip_port *port, + int tag, + void *data, + int status); + /* Additional callback function that may be called by comp_func() */ + void (*async_callback)(void *data, int status); + + void *async_data; /* Addl. data passed to async_callback() */ + + int scatter_ents; /* Number of scatter list entries used */ + + struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */ + + int retries; /* The number of retries left for this command. */ + + int direction; /* Data transfer direction */ + + unsigned long comp_time; /* command completion time, in jiffies */ + + atomic_t active; /* declares if this command sent to the drive. */ +}; + +/* Structure used to describe a port. */ +struct mtip_port { + /* Pointer back to the driver data for this port. */ + struct driver_data *dd; + /* + * Used to determine if the data pointed to by the + * identify field is valid. + */ + unsigned long identify_valid; + /* Base address of the memory mapped IO for the port. */ + void __iomem *mmio; + /* Array of pointers to the memory mapped s_active registers. */ + void __iomem *s_active[MTIP_MAX_SLOT_GROUPS]; + /* Array of pointers to the memory mapped completed registers. */ + void __iomem *completed[MTIP_MAX_SLOT_GROUPS]; + /* Array of pointers to the memory mapped Command Issue registers. */ + void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS]; + /* + * Pointer to the beginning of the command header memory as used + * by the driver. + */ + void *command_list; + /* + * Pointer to the beginning of the command header memory as used + * by the DMA. + */ + dma_addr_t command_list_dma; + /* + * Pointer to the beginning of the RX FIS memory as used + * by the driver. + */ + void *rxfis; + /* + * Pointer to the beginning of the RX FIS memory as used + * by the DMA. + */ + dma_addr_t rxfis_dma; + /* + * Pointer to the beginning of the command table memory as used + * by the driver. + */ + void *command_table; + /* + * Pointer to the beginning of the command table memory as used + * by the DMA. + */ + dma_addr_t command_tbl_dma; + /* + * Pointer to the beginning of the identify data memory as used + * by the driver. + */ + u16 *identify; + /* + * Pointer to the beginning of the identify data memory as used + * by the DMA. + */ + dma_addr_t identify_dma; + /* + * Pointer to the beginning of a sector buffer that is used + * by the driver when issuing internal commands. + */ + u16 *sector_buffer; + /* + * Pointer to the beginning of a sector buffer that is used + * by the DMA when the driver issues internal commands. + */ + dma_addr_t sector_buffer_dma; + /* + * Bit significant, used to determine if a command slot has + * been allocated. i.e. the slot is in use. Bits are cleared + * when the command slot and all associated data structures + * are no longer needed. + */ + unsigned long allocated[SLOTBITS_IN_LONGS]; + /* + * used to queue commands when an internal command is in progress + * or error handling is active + */ + unsigned long cmds_to_issue[SLOTBITS_IN_LONGS]; + /* + * Array of command slots. Structure includes pointers to the + * command header and command table, and completion function and data + * pointers. + */ + struct mtip_cmd commands[MTIP_MAX_COMMAND_SLOTS]; + /* Used by mtip_service_thread to wait for an event */ + wait_queue_head_t svc_wait; + /* + * indicates the state of the port. Also, helps the service thread + * to determine its action on wake up. + */ + unsigned long flags; + /* + * Timer used to complete commands that have been active for too long. + */ + struct timer_list cmd_timer; + /* + * Semaphore used to block threads if there are no + * command slots available. + */ + struct semaphore cmd_slot; + /* Spinlock for working around command-issue bug. */ + spinlock_t cmd_issue_lock; +}; + +/* + * Driver private data structure. + * + * One structure is allocated per probed device. + */ +struct driver_data { + void __iomem *mmio; /* Base address of the HBA registers. */ + + int major; /* Major device number. */ + + int instance; /* Instance number. First device probed is 0, ... */ + + struct gendisk *disk; /* Pointer to our gendisk structure. */ + + struct pci_dev *pdev; /* Pointer to the PCI device structure. */ + + struct request_queue *queue; /* Our request queue. */ + + struct mtip_port *port; /* Pointer to the port data structure. */ + + /* Tasklet used to process the bottom half of the ISR. */ + struct tasklet_struct tasklet; + + unsigned product_type; /* magic value declaring the product type */ + + unsigned slot_groups; /* number of slot groups the product supports */ + + atomic_t drv_cleanup_done; /* Atomic variable for SRSI */ + + unsigned long index; /* Index to determine the disk name */ + + unsigned int ftlrebuildflag; /* FTL rebuild flag */ + + atomic_t resumeflag; /* Atomic variable to track suspend/resume */ + + atomic_t eh_active; /* Flag for error handling tracking */ + + struct task_struct *mtip_svc_handler; /* task_struct of svc thd */ +}; + +#endif diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c index 15ec4db194d1..0088bf60f368 100644 --- a/drivers/block/xen-blkback/blkback.c +++ b/drivers/block/xen-blkback/blkback.c @@ -39,9 +39,6 @@ #include <linux/list.h> #include <linux/delay.h> #include <linux/freezer.h> -#include <linux/loop.h> -#include <linux/falloc.h> -#include <linux/fs.h> #include <xen/events.h> #include <xen/page.h> @@ -362,7 +359,7 @@ static int xen_blkbk_map(struct blkif_request *req, { struct gnttab_map_grant_ref map[BLKIF_MAX_SEGMENTS_PER_REQUEST]; int i; - int nseg = req->nr_segments; + int nseg = req->u.rw.nr_segments; int ret = 0; /* @@ -416,30 +413,25 @@ static int xen_blkbk_map(struct blkif_request *req, return ret; } -static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req) +static int dispatch_discard_io(struct xen_blkif *blkif, + struct blkif_request *req) { int err = 0; int status = BLKIF_RSP_OKAY; struct block_device *bdev = blkif->vbd.bdev; - if (blkif->blk_backend_type == BLKIF_BACKEND_PHY) - /* just forward the discard request */ + blkif->st_ds_req++; + + xen_blkif_get(blkif); + if (blkif->blk_backend_type == BLKIF_BACKEND_PHY || + blkif->blk_backend_type == BLKIF_BACKEND_FILE) { + unsigned long secure = (blkif->vbd.discard_secure && + (req->u.discard.flag & BLKIF_DISCARD_SECURE)) ? + BLKDEV_DISCARD_SECURE : 0; err = blkdev_issue_discard(bdev, req->u.discard.sector_number, req->u.discard.nr_sectors, - GFP_KERNEL, 0); - else if (blkif->blk_backend_type == BLKIF_BACKEND_FILE) { - /* punch a hole in the backing file */ - struct loop_device *lo = bdev->bd_disk->private_data; - struct file *file = lo->lo_backing_file; - - if (file->f_op->fallocate) - err = file->f_op->fallocate(file, - FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, - req->u.discard.sector_number << 9, - req->u.discard.nr_sectors << 9); - else - err = -EOPNOTSUPP; + GFP_KERNEL, secure); } else err = -EOPNOTSUPP; @@ -449,7 +441,9 @@ static void xen_blk_discard(struct xen_blkif *blkif, struct blkif_request *req) } else if (err) status = BLKIF_RSP_ERROR; - make_response(blkif, req->id, req->operation, status); + make_response(blkif, req->u.discard.id, req->operation, status); + xen_blkif_put(blkif); + return err; } static void xen_blk_drain_io(struct xen_blkif *blkif) @@ -573,8 +567,11 @@ __do_block_io_op(struct xen_blkif *blkif) /* Apply all sanity checks to /private copy/ of request. */ barrier(); - - if (dispatch_rw_block_io(blkif, &req, pending_req)) + if (unlikely(req.operation == BLKIF_OP_DISCARD)) { + free_req(pending_req); + if (dispatch_discard_io(blkif, &req)) + break; + } else if (dispatch_rw_block_io(blkif, &req, pending_req)) break; /* Yield point for this unbounded loop. */ @@ -633,10 +630,6 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, blkif->st_f_req++; operation = WRITE_FLUSH; break; - case BLKIF_OP_DISCARD: - blkif->st_ds_req++; - operation = REQ_DISCARD; - break; default: operation = 0; /* make gcc happy */ goto fail_response; @@ -644,9 +637,9 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, } /* Check that the number of segments is sane. */ - nseg = req->nr_segments; - if (unlikely(nseg == 0 && operation != WRITE_FLUSH && - operation != REQ_DISCARD) || + nseg = req->u.rw.nr_segments; + + if (unlikely(nseg == 0 && operation != WRITE_FLUSH) || unlikely(nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) { pr_debug(DRV_PFX "Bad number of segments in request (%d)\n", nseg); @@ -654,12 +647,12 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, goto fail_response; } - preq.dev = req->handle; + preq.dev = req->u.rw.handle; preq.sector_number = req->u.rw.sector_number; preq.nr_sects = 0; pending_req->blkif = blkif; - pending_req->id = req->id; + pending_req->id = req->u.rw.id; pending_req->operation = req->operation; pending_req->status = BLKIF_RSP_OKAY; pending_req->nr_pages = nseg; @@ -707,7 +700,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, * the hypercall to unmap the grants - that is all done in * xen_blkbk_unmap. */ - if (operation != REQ_DISCARD && xen_blkbk_map(req, pending_req, seg)) + if (xen_blkbk_map(req, pending_req, seg)) goto fail_flush; /* @@ -739,23 +732,16 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, /* This will be hit if the operation was a flush or discard. */ if (!bio) { - BUG_ON(operation != WRITE_FLUSH && operation != REQ_DISCARD); + BUG_ON(operation != WRITE_FLUSH); - if (operation == WRITE_FLUSH) { - bio = bio_alloc(GFP_KERNEL, 0); - if (unlikely(bio == NULL)) - goto fail_put_bio; + bio = bio_alloc(GFP_KERNEL, 0); + if (unlikely(bio == NULL)) + goto fail_put_bio; - biolist[nbio++] = bio; - bio->bi_bdev = preq.bdev; - bio->bi_private = pending_req; - bio->bi_end_io = end_block_io_op; - } else if (operation == REQ_DISCARD) { - xen_blk_discard(blkif, req); - xen_blkif_put(blkif); - free_req(pending_req); - return 0; - } + biolist[nbio++] = bio; + bio->bi_bdev = preq.bdev; + bio->bi_private = pending_req; + bio->bi_end_io = end_block_io_op; } /* @@ -784,7 +770,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif, xen_blkbk_unmap(pending_req); fail_response: /* Haven't submitted any bio's yet. */ - make_response(blkif, req->id, req->operation, BLKIF_RSP_ERROR); + make_response(blkif, req->u.rw.id, req->operation, BLKIF_RSP_ERROR); free_req(pending_req); msleep(1); /* back off a bit */ return -EIO; diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h index dfb1b3a43a5d..d0ee7edc9be8 100644 --- a/drivers/block/xen-blkback/common.h +++ b/drivers/block/xen-blkback/common.h @@ -60,58 +60,66 @@ struct blkif_common_response { char dummy; }; -/* i386 protocol version */ -#pragma pack(push, 4) - struct blkif_x86_32_request_rw { + uint8_t nr_segments; /* number of segments */ + blkif_vdev_t handle; /* only for read/write requests */ + uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; -}; +} __attribute__((__packed__)); struct blkif_x86_32_request_discard { + uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */ + blkif_vdev_t _pad1; /* was "handle" for read/write requests */ + uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ - uint64_t nr_sectors; -}; + uint64_t nr_sectors; +} __attribute__((__packed__)); struct blkif_x86_32_request { uint8_t operation; /* BLKIF_OP_??? */ - uint8_t nr_segments; /* number of segments */ - blkif_vdev_t handle; /* only for read/write requests */ - uint64_t id; /* private guest value, echoed in resp */ union { struct blkif_x86_32_request_rw rw; struct blkif_x86_32_request_discard discard; } u; -}; +} __attribute__((__packed__)); + +/* i386 protocol version */ +#pragma pack(push, 4) struct blkif_x86_32_response { uint64_t id; /* copied from request */ uint8_t operation; /* copied from request */ int16_t status; /* BLKIF_RSP_??? */ }; #pragma pack(pop) - /* x86_64 protocol version */ struct blkif_x86_64_request_rw { + uint8_t nr_segments; /* number of segments */ + blkif_vdev_t handle; /* only for read/write requests */ + uint32_t _pad1; /* offsetof(blkif_reqest..,u.rw.id)==8 */ + uint64_t id; blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; -}; +} __attribute__((__packed__)); struct blkif_x86_64_request_discard { + uint8_t flag; /* BLKIF_DISCARD_SECURE or zero */ + blkif_vdev_t _pad1; /* was "handle" for read/write requests */ + uint32_t _pad2; /* offsetof(blkif_..,u.discard.id)==8 */ + uint64_t id; blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ - uint64_t nr_sectors; -}; + uint64_t nr_sectors; +} __attribute__((__packed__)); struct blkif_x86_64_request { uint8_t operation; /* BLKIF_OP_??? */ - uint8_t nr_segments; /* number of segments */ - blkif_vdev_t handle; /* only for read/write requests */ - uint64_t __attribute__((__aligned__(8))) id; union { struct blkif_x86_64_request_rw rw; struct blkif_x86_64_request_discard discard; } u; -}; +} __attribute__((__packed__)); + struct blkif_x86_64_response { uint64_t __attribute__((__aligned__(8))) id; uint8_t operation; /* copied from request */ @@ -156,6 +164,7 @@ struct xen_vbd { /* Cached size parameter. */ sector_t size; bool flush_support; + bool discard_secure; }; struct backend_info; @@ -237,22 +246,23 @@ static inline void blkif_get_x86_32_req(struct blkif_request *dst, { int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST; dst->operation = src->operation; - dst->nr_segments = src->nr_segments; - dst->handle = src->handle; - dst->id = src->id; switch (src->operation) { case BLKIF_OP_READ: case BLKIF_OP_WRITE: case BLKIF_OP_WRITE_BARRIER: case BLKIF_OP_FLUSH_DISKCACHE: + dst->u.rw.nr_segments = src->u.rw.nr_segments; + dst->u.rw.handle = src->u.rw.handle; + dst->u.rw.id = src->u.rw.id; dst->u.rw.sector_number = src->u.rw.sector_number; barrier(); - if (n > dst->nr_segments) - n = dst->nr_segments; + if (n > dst->u.rw.nr_segments) + n = dst->u.rw.nr_segments; for (i = 0; i < n; i++) dst->u.rw.seg[i] = src->u.rw.seg[i]; break; case BLKIF_OP_DISCARD: + dst->u.discard.flag = src->u.discard.flag; dst->u.discard.sector_number = src->u.discard.sector_number; dst->u.discard.nr_sectors = src->u.discard.nr_sectors; break; @@ -266,22 +276,23 @@ static inline void blkif_get_x86_64_req(struct blkif_request *dst, { int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST; dst->operation = src->operation; - dst->nr_segments = src->nr_segments; - dst->handle = src->handle; - dst->id = src->id; switch (src->operation) { case BLKIF_OP_READ: case BLKIF_OP_WRITE: case BLKIF_OP_WRITE_BARRIER: case BLKIF_OP_FLUSH_DISKCACHE: + dst->u.rw.nr_segments = src->u.rw.nr_segments; + dst->u.rw.handle = src->u.rw.handle; + dst->u.rw.id = src->u.rw.id; dst->u.rw.sector_number = src->u.rw.sector_number; barrier(); - if (n > dst->nr_segments) - n = dst->nr_segments; + if (n > dst->u.rw.nr_segments) + n = dst->u.rw.nr_segments; for (i = 0; i < n; i++) dst->u.rw.seg[i] = src->u.rw.seg[i]; break; case BLKIF_OP_DISCARD: + dst->u.discard.flag = src->u.discard.flag; dst->u.discard.sector_number = src->u.discard.sector_number; dst->u.discard.nr_sectors = src->u.discard.nr_sectors; break; diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index 37c794d31264..24a2fb57e5d0 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -338,6 +338,9 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle, if (q && q->flush_flags) vbd->flush_support = true; + if (q && blk_queue_secdiscard(q)) + vbd->discard_secure = true; + DPRINTK("Successful creation of handle=%04x (dom=%u)\n", handle, blkif->domid); return 0; @@ -420,6 +423,15 @@ int xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info *be) state = 1; blkif->blk_backend_type = BLKIF_BACKEND_PHY; } + /* Optional. */ + err = xenbus_printf(xbt, dev->nodename, + "discard-secure", "%d", + blkif->vbd.discard_secure); + if (err) { + xenbus_dev_fatal(dev, err, + "writting discard-secure"); + goto kfree; + } } } else { err = PTR_ERR(type); diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 9fd3ee203b1e..2f22874c0a37 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -98,7 +98,8 @@ struct blkfront_info unsigned long shadow_free; unsigned int feature_flush; unsigned int flush_op; - unsigned int feature_discard; + unsigned int feature_discard:1; + unsigned int feature_secdiscard:1; unsigned int discard_granularity; unsigned int discard_alignment; int is_ready; @@ -135,15 +136,15 @@ static int get_id_from_freelist(struct blkfront_info *info) { unsigned long free = info->shadow_free; BUG_ON(free >= BLK_RING_SIZE); - info->shadow_free = info->shadow[free].req.id; - info->shadow[free].req.id = 0x0fffffee; /* debug */ + info->shadow_free = info->shadow[free].req.u.rw.id; + info->shadow[free].req.u.rw.id = 0x0fffffee; /* debug */ return free; } static void add_id_to_freelist(struct blkfront_info *info, unsigned long id) { - info->shadow[id].req.id = info->shadow_free; + info->shadow[id].req.u.rw.id = info->shadow_free; info->shadow[id].request = NULL; info->shadow_free = id; } @@ -156,7 +157,7 @@ static int xlbd_reserve_minors(unsigned int minor, unsigned int nr) if (end > nr_minors) { unsigned long *bitmap, *old; - bitmap = kzalloc(BITS_TO_LONGS(end) * sizeof(*bitmap), + bitmap = kcalloc(BITS_TO_LONGS(end), sizeof(*bitmap), GFP_KERNEL); if (bitmap == NULL) return -ENOMEM; @@ -287,9 +288,9 @@ static int blkif_queue_request(struct request *req) id = get_id_from_freelist(info); info->shadow[id].request = req; - ring_req->id = id; + ring_req->u.rw.id = id; ring_req->u.rw.sector_number = (blkif_sector_t)blk_rq_pos(req); - ring_req->handle = info->handle; + ring_req->u.rw.handle = info->handle; ring_req->operation = rq_data_dir(req) ? BLKIF_OP_WRITE : BLKIF_OP_READ; @@ -305,16 +306,21 @@ static int blkif_queue_request(struct request *req) ring_req->operation = info->flush_op; } - if (unlikely(req->cmd_flags & REQ_DISCARD)) { + if (unlikely(req->cmd_flags & (REQ_DISCARD | REQ_SECURE))) { /* id, sector_number and handle are set above. */ ring_req->operation = BLKIF_OP_DISCARD; - ring_req->nr_segments = 0; ring_req->u.discard.nr_sectors = blk_rq_sectors(req); + if ((req->cmd_flags & REQ_SECURE) && info->feature_secdiscard) + ring_req->u.discard.flag = BLKIF_DISCARD_SECURE; + else + ring_req->u.discard.flag = 0; } else { - ring_req->nr_segments = blk_rq_map_sg(req->q, req, info->sg); - BUG_ON(ring_req->nr_segments > BLKIF_MAX_SEGMENTS_PER_REQUEST); + ring_req->u.rw.nr_segments = blk_rq_map_sg(req->q, req, + info->sg); + BUG_ON(ring_req->u.rw.nr_segments > + BLKIF_MAX_SEGMENTS_PER_REQUEST); - for_each_sg(info->sg, sg, ring_req->nr_segments, i) { + for_each_sg(info->sg, sg, ring_req->u.rw.nr_segments, i) { buffer_mfn = pfn_to_mfn(page_to_pfn(sg_page(sg))); fsect = sg->offset >> 9; lsect = fsect + (sg->length >> 9) - 1; @@ -424,6 +430,8 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size) blk_queue_max_discard_sectors(rq, get_capacity(gd)); rq->limits.discard_granularity = info->discard_granularity; rq->limits.discard_alignment = info->discard_alignment; + if (info->feature_secdiscard) + queue_flag_set_unlocked(QUEUE_FLAG_SECDISCARD, rq); } /* Hard sector size and max sectors impersonate the equiv. hardware. */ @@ -705,7 +713,9 @@ static void blkif_free(struct blkfront_info *info, int suspend) static void blkif_completion(struct blk_shadow *s) { int i; - for (i = 0; i < s->req.nr_segments; i++) + /* Do not let BLKIF_OP_DISCARD as nr_segment is in the same place + * flag. */ + for (i = 0; i < s->req.u.rw.nr_segments; i++) gnttab_end_foreign_access(s->req.u.rw.seg[i].gref, 0, 0UL); } @@ -736,7 +746,8 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) id = bret->id; req = info->shadow[id].request; - blkif_completion(&info->shadow[id]); + if (bret->operation != BLKIF_OP_DISCARD) + blkif_completion(&info->shadow[id]); add_id_to_freelist(info, id); @@ -749,7 +760,9 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) info->gd->disk_name); error = -EOPNOTSUPP; info->feature_discard = 0; + info->feature_secdiscard = 0; queue_flag_clear(QUEUE_FLAG_DISCARD, rq); + queue_flag_clear(QUEUE_FLAG_SECDISCARD, rq); } __blk_end_request_all(req, error); break; @@ -763,7 +776,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id) error = -EOPNOTSUPP; } if (unlikely(bret->status == BLKIF_RSP_ERROR && - info->shadow[id].req.nr_segments == 0)) { + info->shadow[id].req.u.rw.nr_segments == 0)) { printk(KERN_WARNING "blkfront: %s: empty write %s op failed\n", info->flush_op == BLKIF_OP_WRITE_BARRIER ? "barrier" : "flush disk cache", @@ -984,8 +997,8 @@ static int blkfront_probe(struct xenbus_device *dev, INIT_WORK(&info->work, blkif_restart_queue); for (i = 0; i < BLK_RING_SIZE; i++) - info->shadow[i].req.id = i+1; - info->shadow[BLK_RING_SIZE-1].req.id = 0x0fffffff; + info->shadow[i].req.u.rw.id = i+1; + info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff; /* Front end dir is a number, which is used as the id. */ info->handle = simple_strtoul(strrchr(dev->nodename, '/')+1, NULL, 0); @@ -1019,9 +1032,9 @@ static int blkif_recover(struct blkfront_info *info) /* Stage 2: Set up free list. */ memset(&info->shadow, 0, sizeof(info->shadow)); for (i = 0; i < BLK_RING_SIZE; i++) - info->shadow[i].req.id = i+1; + info->shadow[i].req.u.rw.id = i+1; info->shadow_free = info->ring.req_prod_pvt; - info->shadow[BLK_RING_SIZE-1].req.id = 0x0fffffff; + info->shadow[BLK_RING_SIZE-1].req.u.rw.id = 0x0fffffff; /* Stage 3: Find pending requests and requeue them. */ for (i = 0; i < BLK_RING_SIZE; i++) { @@ -1034,17 +1047,19 @@ static int blkif_recover(struct blkfront_info *info) *req = copy[i].req; /* We get a new request id, and must reset the shadow state. */ - req->id = get_id_from_freelist(info); - memcpy(&info->shadow[req->id], ©[i], sizeof(copy[i])); + req->u.rw.id = get_id_from_freelist(info); + memcpy(&info->shadow[req->u.rw.id], ©[i], sizeof(copy[i])); + if (req->operation != BLKIF_OP_DISCARD) { /* Rewrite any grant references invalidated by susp/resume. */ - for (j = 0; j < req->nr_segments; j++) - gnttab_grant_foreign_access_ref( - req->u.rw.seg[j].gref, - info->xbdev->otherend_id, - pfn_to_mfn(info->shadow[req->id].frame[j]), - rq_data_dir(info->shadow[req->id].request)); - info->shadow[req->id].req = *req; + for (j = 0; j < req->u.rw.nr_segments; j++) + gnttab_grant_foreign_access_ref( + req->u.rw.seg[j].gref, + info->xbdev->otherend_id, + pfn_to_mfn(info->shadow[req->u.rw.id].frame[j]), + rq_data_dir(info->shadow[req->u.rw.id].request)); + } + info->shadow[req->u.rw.id].req = *req; info->ring.req_prod_pvt++; } @@ -1135,11 +1150,13 @@ static void blkfront_setup_discard(struct blkfront_info *info) char *type; unsigned int discard_granularity; unsigned int discard_alignment; + unsigned int discard_secure; type = xenbus_read(XBT_NIL, info->xbdev->otherend, "type", NULL); if (IS_ERR(type)) return; + info->feature_secdiscard = 0; if (strncmp(type, "phy", 3) == 0) { err = xenbus_gather(XBT_NIL, info->xbdev->otherend, "discard-granularity", "%u", &discard_granularity, @@ -1150,6 +1167,12 @@ static void blkfront_setup_discard(struct blkfront_info *info) info->discard_granularity = discard_granularity; info->discard_alignment = discard_alignment; } + err = xenbus_gather(XBT_NIL, info->xbdev->otherend, + "discard-secure", "%d", &discard_secure, + NULL); + if (!err) + info->feature_secdiscard = discard_secure; + } else if (strncmp(type, "file", 4) == 0) info->feature_discard = 1; diff --git a/include/xen/interface/io/blkif.h b/include/xen/interface/io/blkif.h index 9324488f23f0..ee338bfde18b 100644 --- a/include/xen/interface/io/blkif.h +++ b/include/xen/interface/io/blkif.h @@ -84,6 +84,21 @@ typedef uint64_t blkif_sector_t; * e07154r6-Data_Set_Management_Proposal_for_ATA-ACS2.doc * http://www.seagate.com/staticfiles/support/disc/manuals/ * Interface%20manuals/100293068c.pdf + * The backend can optionally provide three extra XenBus attributes to + * further optimize the discard functionality: + * 'discard-aligment' - Devices that support discard functionality may + * internally allocate space in units that are bigger than the exported + * logical block size. The discard-alignment parameter indicates how many bytes + * the beginning of the partition is offset from the internal allocation unit's + * natural alignment. + * 'discard-granularity' - Devices that support discard functionality may + * internally allocate space using units that are bigger than the logical block + * size. The discard-granularity parameter indicates the size of the internal + * allocation unit in bytes if reported by the device. Otherwise the + * discard-granularity will be set to match the device's physical block size. + * 'discard-secure' - All copies of the discarded sectors (potentially created + * by garbage collection) must also be erased. To use this feature, the flag + * BLKIF_DISCARD_SECURE must be set in the blkif_request_trim. */ #define BLKIF_OP_DISCARD 5 @@ -95,6 +110,12 @@ typedef uint64_t blkif_sector_t; #define BLKIF_MAX_SEGMENTS_PER_REQUEST 11 struct blkif_request_rw { + uint8_t nr_segments; /* number of segments */ + blkif_vdev_t handle; /* only for read/write requests */ +#ifdef CONFIG_X86_64 + uint32_t _pad1; /* offsetof(blkif_request,u.rw.id) == 8 */ +#endif + uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ struct blkif_request_segment { grant_ref_t gref; /* reference to I/O buffer frame */ @@ -102,23 +123,28 @@ struct blkif_request_rw { /* @last_sect: last sector in frame to transfer (inclusive). */ uint8_t first_sect, last_sect; } seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; -}; +} __attribute__((__packed__)); struct blkif_request_discard { + uint8_t flag; /* BLKIF_DISCARD_SECURE or zero. */ +#define BLKIF_DISCARD_SECURE (1<<0) /* ignored if discard-secure=0 */ + blkif_vdev_t _pad1; /* only for read/write requests */ +#ifdef CONFIG_X86_64 + uint32_t _pad2; /* offsetof(blkif_req..,u.discard.id)==8*/ +#endif + uint64_t id; /* private guest value, echoed in resp */ blkif_sector_t sector_number; - uint64_t nr_sectors; -}; + uint64_t nr_sectors; + uint8_t _pad3; +} __attribute__((__packed__)); struct blkif_request { uint8_t operation; /* BLKIF_OP_??? */ - uint8_t nr_segments; /* number of segments */ - blkif_vdev_t handle; /* only for read/write requests */ - uint64_t id; /* private guest value, echoed in resp */ union { struct blkif_request_rw rw; struct blkif_request_discard discard; } u; -}; +} __attribute__((__packed__)); struct blkif_response { uint64_t id; /* copied from request */ |