linux-toradex.git/drivers/ata/libata-eh.c, branch v3.2.28 Linux kernel for Apalis and Colibri modules libata: skip old error history when counting probe trials 2012-05-11T12:14:52+00:00 Lin Ming ming.m.lin@intel.com 2012-05-03T14:15:07+00:00 9846235aec215c33af3ed3758b67e31ff6981089 commit 6868225e3e92399068be9a5f1635752d91012ad5 upstream. Commit d902747("[libata] Add ATA transport class") introduced ATA_EFLAG_OLD_ER to mark entries in the error ring as cleared. But ata_count_probe_trials_cb() didn't check this flag and it still counts the old error history. So wrong probe trials count is returned and it causes problem, for example, SATA link speed is slowed down from 3.0Gbps to 1.5Gbps. Fix it by checking ATA_EFLAG_OLD_ER in ata_count_probe_trials_cb(). Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> 
commit 6868225e3e92399068be9a5f1635752d91012ad5 upstream.

Commit d902747("[libata] Add ATA transport class") introduced
ATA_EFLAG_OLD_ER to mark entries in the error ring as cleared.

But ata_count_probe_trials_cb() didn't check this flag and it still
counts the old error history. So wrong probe trials count is returned
and it causes problem, for example, SATA link speed is slowed down from
3.0Gbps to 1.5Gbps.

Fix it by checking ATA_EFLAG_OLD_ER in ata_count_probe_trials_cb().

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
[libata] Issue SRST to Sil3726 PMP 2011-11-09T06:38:00+00:00 Gwendal Grignou gwendal@google.com 2011-10-20T00:17:02+00:00 7a46c0780babea7d0b3f277a33ea243be38eb942 Reenable sending SRST to devices connected behind a Sil3726 PMP. This allow staggered spinups and handles drives that spins up slowly. While the drives spin up, the PMP will not accept SRST. Most controller reissues the reset until the drive is ready, while some [Sil3124] returns an error. In ata_eh_error, wait 10s before reset the ATA port and try again. Signed-off-by: Gwendal Grignou <gwendal@google.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jeff Garzik <jgarzik@redhat.com> 
Reenable sending SRST to devices connected behind a Sil3726 PMP.
This allow staggered spinups and handles drives that spins up slowly.

While the drives spin up, the PMP will not accept SRST.
Most controller reissues the reset until the drive is ready, while
some [Sil3124] returns an error.
In ata_eh_error, wait 10s before reset the ATA port and try again.

Signed-off-by: Gwendal Grignou <gwendal@google.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
ide/ata: Add export.h for EXPORT_SYMBOL/THIS_MODULE where needed 2011-10-31T23:31:37+00:00 Paul Gortmaker paul.gortmaker@windriver.com 2011-07-17T19:33:58+00:00 38789fda295689689d064c0157bc363b1837b5e6 They were getting this implicitly by an include of module.h from device.h -- but we are going to clean that up and break that include chain, so include export.h explicitly now. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> 
They were getting this implicitly by an include of module.h
from device.h -- but we are going to clean that up and break
that include chain, so include export.h explicitly now.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
libata-eh: ata_eh_followup_srst_needed() does not need 'classes' parameter 2011-10-08T04:07:15+00:00 Sergei Shtylyov sshtylyov@ru.mvista.com 2011-08-09T19:25:50+00:00 e8411fbad67a6fe3f989cf6391df7c72bf4a1f9e ... since it does not use it. Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com> 
... since it does not use it.

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
libata: leave port thawed after reset failure 2011-07-23T21:57:36+00:00 Tejun Heo tj@kernel.org 2011-05-25T10:23:56+00:00 8ea7645c5a949f9d0ea86edc0778713b5e63ab74 libata EH intentionally left a port frozen if it failed ata_eh_reset(). The intention was avoiding continuous loop of resets when the controller or attached device is flaky and reporting spurious hotplug events. Once port enters this state, it can be recovered with manual rescan, which seemed reasonable. However, outside of my convoluted test setup, there have been very few reports justifying this choice while there have been more cases where the automatic freezing of the port after hotplug attempt of a faulty device caused confusion and led to unnecessary resets. This patch changes the behavior so that the port is thawed after reset failure. This change doesn't necessarily solve but makes it easier and more intuitive to work around hotplug related problems (ie. re-pluggin or power cycling the device) as reported in the followings. https://bugzilla.kernel.org/show_bug.cgi?id=34712 http://thread.gmane.org/gmane.linux.kernel/1123265/focus=49548 Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Reartes Guillermo <rtguille@gmail.com> Reported-by: Bruce Stenning <b.stenning@indigovision.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com> 
libata EH intentionally left a port frozen if it failed
ata_eh_reset().  The intention was avoiding continuous loop of resets
when the controller or attached device is flaky and reporting spurious
hotplug events.  Once port enters this state, it can be recovered with
manual rescan, which seemed reasonable.

However, outside of my convoluted test setup, there have been very few
reports justifying this choice while there have been more cases where
the automatic freezing of the port after hotplug attempt of a faulty
device caused confusion and led to unnecessary resets.

This patch changes the behavior so that the port is thawed after reset
failure.  This change doesn't necessarily solve but makes it easier
and more intuitive to work around hotplug related problems
(ie. re-pluggin or power cycling the device) as reported in the
followings.

  https://bugzilla.kernel.org/show_bug.cgi?id=34712
  http://thread.gmane.org/gmane.linux.kernel/1123265/focus=49548

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Reartes Guillermo <rtguille@gmail.com>
Reported-by: Bruce Stenning <b.stenning@indigovision.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
ata: Convert ata_<foo>_printk(KERN_<LEVEL> to ata_<foo>_<level> 2011-07-23T21:57:36+00:00 Joe Perches joe@perches.com 2011-04-15T22:51:59+00:00 a9a79dfec239568bdbf778242f8fcd10bcc5b9e2 Saves text by removing nearly duplicated text format strings by creating ata_<foo>_printk functions and printf extension %pV. ata defconfig size shrinks ~5% (~8KB), allyesconfig ~2.5% (~13KB) Format string duplication comes from: #define ata_link_printk(link, lv, fmt, args...) do { \ if (sata_pmp_attached((link)->ap) || (link)->ap->slave_link) \ printk("%sata%u.%02u: "fmt, lv, (link)->ap->print_id, \ (link)->pmp , ##args); \ else \ printk("%sata%u: "fmt, lv, (link)->ap->print_id , ##args); \ } while(0) Coalesce long formats. $ size drivers/ata/built-in.* text data bss dec hex filename 544969 73893 116584 735446 b38d6 drivers/ata/built-in.allyesconfig.ata.o 558429 73893 117864 750186 b726a drivers/ata/built-in.allyesconfig.dev_level.o 141328 14689 4220 160237 271ed drivers/ata/built-in.defconfig.ata.o 149567 14689 4220 168476 2921c drivers/ata/built-in.defconfig.dev_level.o Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com> 
Saves text by removing nearly duplicated text format strings by
creating ata_<foo>_printk functions and printf extension %pV.

ata defconfig size shrinks ~5% (~8KB), allyesconfig ~2.5% (~13KB)

Format string duplication comes from:

 #define ata_link_printk(link, lv, fmt, args...) do { \
       if (sata_pmp_attached((link)->ap) || (link)->ap->slave_link)    \
               printk("%sata%u.%02u: "fmt, lv, (link)->ap->print_id,   \
                      (link)->pmp , ##args); \
       else \
               printk("%sata%u: "fmt, lv, (link)->ap->print_id , ##args); \
       } while(0)

Coalesce long formats.

$ size drivers/ata/built-in.*
   text	   data	    bss	    dec	    hex	filename
 544969	  73893	 116584	 735446	  b38d6	drivers/ata/built-in.allyesconfig.ata.o
 558429	  73893	 117864	 750186	  b726a	drivers/ata/built-in.allyesconfig.dev_level.o
 141328	  14689	   4220	 160237	  271ed	drivers/ata/built-in.defconfig.ata.o
 149567	  14689	   4220	 168476	  2921c	drivers/ata/built-in.defconfig.dev_level.o

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
libata: fix unexpectedly frozen port after ata_eh_reset() 2011-06-07T19:55:55+00:00 Tejun Heo tj@kernel.org 2011-05-25T11:19:39+00:00 8c56cacc724c7650b893d43068fa66044aa29a61 To work around controllers which can't properly plug events while reset, ata_eh_reset() clears error states and ATA_PFLAG_EH_PENDING after reset but before RESET is marked done. As reset is the final recovery action and full verification of devices including onlineness and classfication match is done afterwards, this shouldn't lead to lost devices or missed hotplug events. Unfortunately, it forgot to thaw the port when clearing EH_PENDING, so if the condition happens after resetting an empty port, the port could be left frozen and EH will end without thawing it, making the port unresponsive to further hotplug events. Thaw if the port is frozen after clearing EH_PENDING. This problem is reported by Bruce Stenning in the following thread. http://thread.gmane.org/gmane.linux.kernel/1123265 stable: I think we should weather this patch a bit longer in -rcX before sending it to -stable. Please wait at least a month after this patch makes upstream. Thanks. -v2: Fixed spelling in the comment per Dave Howorth. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Bruce Stenning <b.stenning@indigovision.com> Cc: stable@kernel.org Cc: Dave Howorth <dhoworth@mrc-lmb.cam.ac.uk> Signed-off-by: Jeff Garzik <jgarzik@pobox.com> 
To work around controllers which can't properly plug events while
reset, ata_eh_reset() clears error states and ATA_PFLAG_EH_PENDING
after reset but before RESET is marked done.  As reset is the final
recovery action and full verification of devices including onlineness
and classfication match is done afterwards, this shouldn't lead to
lost devices or missed hotplug events.

Unfortunately, it forgot to thaw the port when clearing EH_PENDING, so
if the condition happens after resetting an empty port, the port could
be left frozen and EH will end without thawing it, making the port
unresponsive to further hotplug events.

Thaw if the port is frozen after clearing EH_PENDING.  This problem is
reported by Bruce Stenning in the following thread.

 http://thread.gmane.org/gmane.linux.kernel/1123265

stable: I think we should weather this patch a bit longer in -rcX
	before sending it to -stable.  Please wait at least a month
	after this patch makes upstream.  Thanks.

-v2: Fixed spelling in the comment per Dave Howorth.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Bruce Stenning <b.stenning@indigovision.com>
Cc: stable@kernel.org
Cc: Dave Howorth <dhoworth@mrc-lmb.cam.ac.uk>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
libata: Power off empty ports 2011-05-20T00:50:53+00:00 Kristen Carlson Accardi kristen@linux.intel.com 2011-03-04T18:24:11+00:00 8a745f1f39b7a20047a362b67ce9151c07d14440 Give users the option of completely powering off unoccupied SATA ports using the existing min_power link_power_management_policy option. When the use selects this option on an empty port, we will power the port off by setting DET to off. For occupied ports, behavior is unchanged. Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com> 
Give users the option of completely powering off unoccupied
SATA ports using the existing min_power link_power_management_policy
option.  When the use selects this option on an empty port, we
will power the port off by setting DET to off.  For occupied ports,
behavior is unchanged.

Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
libata: fix oops when LPM is used with PMP 2011-05-14T18:51:40+00:00 Tejun Heo tj@kernel.org 2011-05-09T14:04:11+00:00 5f6f12ccf3aa42cfc0c5bde9228df0c843dd63f7 ae01b2493c (libata: Implement ATA_FLAG_NO_DIPM and apply it to mcp65) added ATA_FLAG_NO_DIPM and made ata_eh_set_lpm() check the flag. However, @ap is NULL if @link points to a PMP link and thus the unconditional @ap->flags dereference leads to the following oops. BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: [<ffffffff813f98e1>] ata_eh_recover+0x9a1/0x1510 ... Pid: 295, comm: scsi_eh_4 Tainted: P 2.6.38.5-core2 #1 System76, Inc. Serval Professional/Serval Professional RIP: 0010:[<ffffffff813f98e1>] [<ffffffff813f98e1>] ata_eh_recover+0x9a1/0x1510 RSP: 0018:ffff880132defbf0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff880132f40000 RCX: 0000000000000000 RDX: ffff88013377c000 RSI: ffff880132f40000 RDI: 0000000000000000 RBP: ffff880132defce0 R08: ffff88013377dc58 R09: ffff880132defd98 R10: 0000000000000000 R11: 00000000ffffffff R12: 0000000000000000 R13: 0000000000000000 R14: ffff88013377c000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8800bf700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000018 CR3: 0000000001a03000 CR4: 00000000000406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process scsi_eh_4 (pid: 295, threadinfo ffff880132dee000, task ffff880133b416c0) Stack: 0000000000000000 ffff880132defcc0 0000000000000000 ffff880132f42738 ffffffff813ee8f0 ffffffff813eefe0 ffff880132defd98 ffff88013377f190 ffffffffa00b3e30 ffffffff813ef030 0000000032defc60 ffff880100000000 Call Trace: [<ffffffff81400867>] sata_pmp_error_handler+0x607/0xc30 [<ffffffffa00b273f>] ahci_error_handler+0x1f/0x70 [libahci] [<ffffffff813faade>] ata_scsi_error+0x5be/0x900 [<ffffffff813cf724>] scsi_error_handler+0x124/0x650 [<ffffffff810834b6>] kthread+0x96/0xa0 [<ffffffff8100cd64>] kernel_thread_helper+0x4/0x10 Code: 8b 95 70 ff ff ff b8 00 00 00 00 48 3b 9a 10 2e 00 00 48 0f 44 c2 48 89 85 70 ff ff ff 48 8b 8d 70 ff ff ff f6 83 69 02 00 00 01 <48> 8b 41 18 0f 85 48 01 00 00 48 85 c9 74 12 48 8b 51 08 48 83 RIP [<ffffffff813f98e1>] ata_eh_recover+0x9a1/0x1510 RSP <ffff880132defbf0> CR2: 0000000000000018 Fix it by testing @link->ap->flags instead. stable: ATA_FLAG_NO_DIPM was added during 2.6.39 cycle but was backported to 2.6.37 and 38. This is a fix for that and thus also applicable to 2.6.37 and 38. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: "Nathan A. Mourey II" <nmoureyii@ne.rr.com> LKML-Reference: <1304555277.2059.2.camel@localhost.localdomain> Cc: Connor H <cmdkhh@gmail.com> Cc: stable@kernel.org Signed-off-by: Jeff Garzik <jgarzik@pobox.com> 
ae01b2493c (libata: Implement ATA_FLAG_NO_DIPM and apply it to mcp65)
added ATA_FLAG_NO_DIPM and made ata_eh_set_lpm() check the flag.
However, @ap is NULL if @link points to a PMP link and thus the
unconditional @ap->flags dereference leads to the following oops.

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
  IP: [<ffffffff813f98e1>] ata_eh_recover+0x9a1/0x1510
  ...
  Pid: 295, comm: scsi_eh_4 Tainted: P            2.6.38.5-core2 #1 System76, Inc. Serval Professional/Serval Professional
  RIP: 0010:[<ffffffff813f98e1>]  [<ffffffff813f98e1>] ata_eh_recover+0x9a1/0x1510
  RSP: 0018:ffff880132defbf0  EFLAGS: 00010246
  RAX: 0000000000000000 RBX: ffff880132f40000 RCX: 0000000000000000
  RDX: ffff88013377c000 RSI: ffff880132f40000 RDI: 0000000000000000
  RBP: ffff880132defce0 R08: ffff88013377dc58 R09: ffff880132defd98
  R10: 0000000000000000 R11: 00000000ffffffff R12: 0000000000000000
  R13: 0000000000000000 R14: ffff88013377c000 R15: 0000000000000000
  FS:  0000000000000000(0000) GS:ffff8800bf700000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  CR2: 0000000000000018 CR3: 0000000001a03000 CR4: 00000000000406e0
  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  Process scsi_eh_4 (pid: 295, threadinfo ffff880132dee000, task ffff880133b416c0)
  Stack:
   0000000000000000 ffff880132defcc0 0000000000000000 ffff880132f42738
   ffffffff813ee8f0 ffffffff813eefe0 ffff880132defd98 ffff88013377f190
   ffffffffa00b3e30 ffffffff813ef030 0000000032defc60 ffff880100000000
  Call Trace:
   [<ffffffff81400867>] sata_pmp_error_handler+0x607/0xc30
   [<ffffffffa00b273f>] ahci_error_handler+0x1f/0x70 [libahci]
   [<ffffffff813faade>] ata_scsi_error+0x5be/0x900
   [<ffffffff813cf724>] scsi_error_handler+0x124/0x650
   [<ffffffff810834b6>] kthread+0x96/0xa0
   [<ffffffff8100cd64>] kernel_thread_helper+0x4/0x10
  Code: 8b 95 70 ff ff ff b8 00 00 00 00 48 3b 9a 10 2e 00 00 48 0f 44 c2 48 89 85 70 ff ff ff 48 8b 8d 70 ff ff ff f6 83 69 02 00 00 01 <48> 8b 41 18 0f 85 48 01 00 00 48 85 c9 74 12 48 8b 51 08 48 83
  RIP  [<ffffffff813f98e1>] ata_eh_recover+0x9a1/0x1510
   RSP <ffff880132defbf0>
  CR2: 0000000000000018

Fix it by testing @link->ap->flags instead.

stable: ATA_FLAG_NO_DIPM was added during 2.6.39 cycle but was
        backported to 2.6.37 and 38.  This is a fix for that and thus
        also applicable to 2.6.37 and 38.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: "Nathan A. Mourey II" <nmoureyii@ne.rr.com>
LKML-Reference: <1304555277.2059.2.camel@localhost.localdomain>
Cc: Connor H <cmdkhh@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
libata: Implement ATA_FLAG_NO_DIPM and apply it to mcp65 2011-04-24T15:32:16+00:00 Tejun Heo tj@kernel.org 2011-03-16T10:14:55+00:00 ae01b2493c3bf03c504c32ac4ebb01d528508db3 NVIDIA mcp65 familiy of controllers cause command timeouts when DIPM is used. Implement ATA_FLAG_NO_DIPM and apply it. This problem was reported by Stefan Bader in the following thread. http://thread.gmane.org/gmane.linux.ide/48841 stable: applicable to 2.6.37 and 38. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Stefan Bader <stefan.bader@canonical.com> Cc: stable@kernel.org Signed-off-by: Jeff Garzik <jgarzik@pobox.com> 
NVIDIA mcp65 familiy of controllers cause command timeouts when DIPM
is used.  Implement ATA_FLAG_NO_DIPM and apply it.

This problem was reported by Stefan Bader in the following thread.

 http://thread.gmane.org/gmane.linux.ide/48841

stable: applicable to 2.6.37 and 38.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Stefan Bader <stefan.bader@canonical.com>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>