Re: ahci: sata hotplug doesn't work after suspend

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On 02/20/2012 09:30 AM, Lin Ming wrote:
> On Sun, 2012-02-19 at 22:17 +0100, Holger Macht wrote:
>> On So 19. Feb - 21:11:33, Jiri Slaby wrote:
>>> Hi,
>>>
>>> ahci hotplug stopped working here. It always worked (-next-20111206 is
>>> the last known working for sure). I'm using -next and after plugging a
>>> sata disk in, nothing happens. I don't *think* (in the traffic, it's
>>> hard to tell for sure) an interrupt is generated either. I also *think*
>>> that it works before suspend/resume, but not after. (Or maybe uptime
>>> matters?)
>>>
>>> This happens before suspend on plug-in:
>>> ata3: exception Emask 0x50 SAct 0x0 SErr 0x40d0800 action 0xe frozen
>>> ata3: irq_stat 0x00000040, connection status changed
>>> ata3: SError: { HostInt PHYRdyChg CommWake 10B8B DevExch }
>>> ata3: hard resetting link
>>> ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
>>> ata3.00: ATA-8: ST31000528AS, CC38, max UDMA/133
>>> ata3.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32)
>>> ata3.00: configured for UDMA/133
>>> ata3: EH complete
>>> scsi 2:0:0:0: Direct-Access     ATA      ST31000528AS     CC38 PQ: 0 ANSI: 5
>>> sd 2:0:0:0: [sdc] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
>>> sd 2:0:0:0: [sdc] Write Protect is off
>>> sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
>>> sd 2:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't
>>> support DPO or FUA
>>>  sdc: sdc1 sdc2
>>> sd 2:0:0:0: [sdc] Attached SCSI disk
>>>
>>> After suspend/resume and plug-in, nothing appears in dmesg. Storing "- -
>>> -" to /sys/class/scsi_host/host*/scan doesn't help. It looks like the
>>> line is completely dead, because only ata1 and ata2 say "hard resetting
>>> link" after this (and another two disks are connected there).
>>>
>>> I tried 'echo adapter >host_reset', but I get 'write error: Invalid
>>> argument'.
>>>
>>> 00:1f.2 SATA controller [0106]: Intel Corporation 82801IR/IO/IH
>>> (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] [8086:2922] (rev 02)
>>> (prog-if 01 [AHCI 1.0])
>>>         Subsystem: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port
>>> SATA Controller [AHCI mode] [8086:2922]
>>>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
>>> ParErr- Stepping- SERR- FastB2B- DisINTx+
>>>         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
>>> <TAbort- <MAbort- >SERR- <PERR- INTx-
>>>         Latency: 0
>>>         Interrupt: pin B routed to IRQ 43
>>>         Region 0: I/O ports at cc00 [size=8]
>>>         Region 1: I/O ports at c880 [size=4]
>>>         Region 2: I/O ports at c800 [size=8]
>>>         Region 3: I/O ports at c480 [size=4]
>>>         Region 4: I/O ports at c400 [size=32]
>>>         Region 5: Memory at feb7c800 (32-bit, non-prefetchable) [size=2K]
>>>         Capabilities: [80] MSI: Enable+ Count=1/16 Maskable- 64bit-
>>>                 Address: fee0100c  Data: 4171
>>>         Capabilities: [70] Power Management version 3
>>>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
>>> PME(D0-,D1-,D2-,D3hot+,D3cold-)
>>>                 Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
>>>         Capabilities: [a8] SATA HBA v1.0 BAR4 Offset=00000004
>>>         Capabilities: [b0] Vendor Specific Information: Len=06 <?>
>>>         Kernel driver in use: ahci
>>>
>>> Any ideas what that could be?
>>
>> I suspect this is caused by commit
>> 9ee4f3933930abf5cc34f8e9d69fe0e08c18f602. Maybe you could verify? I
>> bisected this a couple of days ago but didn't have time to look into it
>> further. Maybe Lin can help here if this is the problematic commit.
> 
> I'll try to re-produce this issue first.

Ok, just a few more information. Suspend/resume cycle is needed to see
the issue. Reverting of 9ee4f3933930 helps when this is applied too (I
haven't tried one or the other alone):

--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5305,25 +5305,16 @@ static int ata_port_suspend_common(struct device
*dev, pm_message_t mesg)

 static int ata_port_suspend(struct device *dev)
 {
-       if (pm_runtime_suspended(dev))
-               return 0;
-
        return ata_port_suspend_common(dev, PMSG_SUSPEND);
 }

 static int ata_port_do_freeze(struct device *dev)
 {
-       if (pm_runtime_suspended(dev))
-               pm_runtime_resume(dev);
-
        return ata_port_suspend_common(dev, PMSG_FREEZE);
 }

 static int ata_port_poweroff(struct device *dev)
 {
-       if (pm_runtime_suspended(dev))
-               return 0;
-
        return ata_port_suspend_common(dev, PMSG_HIBERNATE);
 }

@@ -5339,16 +5330,7 @@ static int ata_port_resume_common(struct device *dev)

 static int ata_port_resume(struct device *dev)
 {
-       int rc;
-
-       rc = ata_port_resume_common(dev);
-       if (!rc) {
-               pm_runtime_disable(dev);
-               pm_runtime_set_active(dev);
-               pm_runtime_enable(dev);
-       }
-
-       return rc;
+       return ata_port_resume_common(dev);
 }

 static const struct dev_pm_ops ata_port_pm_ops = {



-- 
js
suse labs
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