2.6.19-rc2-mm2 AHCI lengthy pause on detection

2.6.19-rc2-mm2 AHCI lengthy pause on detection

[Berck E. Nash]

AHCI pauses heartily on during detection boot, but eventually proceeds. 
  This problem currently exists with 2.6.19-rc2-mm1, but did not exist 
in 2.6.17.3.  I realize that's a huge gap, and if you'd like me to 
narrow it down, I'll be glad to try.

Messages surrounding the hang:

scsi2 : ahci
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2.00: qc timeout (cmd 0xec)
ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
ata2: port is slow to respond, please be patient (Status 0x80)
ata2: port failed to respond (30 secs, Status 0x80)
ata2: COMRESET failed (device not ready)
ata2: hardreset failed, retrying in 5 secs
ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata2.00: ATA-6, max UDMA/133, 640 sectors: LBA
ata2.00: ata2: dev 0 multi count 1
ata2.00: configured for UDMA/133

I should note that on this system ata1 and ata3 both detect quickly, but 
they have 1.5 Gbps devices whereas ata2 has a 3.0Gbps device.

The device:
00:1f.2 SATA controller: Intel Corporation 82801GR/GH (ICH7 Family) 
Serial ATA Storage Controller AHCI (rev 01) (prog-if 01 [AHCI 1.0])
         Subsystem: ASUSTeK Computer Inc. Unknown device 2606
         Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 50
         I/O ports at e400 [size=8]
         I/O ports at e080 [size=4]
         I/O ports at e000 [size=8]
         I/O ports at dc00 [size=4]
         I/O ports at d880 [size=16]
         Memory at febfb800 (32-bit, non-prefetchable) [size=1K]
         Capabilities: <access denied>

dmesg snip from 2.6.17.3, without the hangup:

scsi1 : ahci
ata2: port reset, p_is 40000001 is 2 pis 0 cmd 4017 tf 451 ss 123 se 0
ata2: SATA link up 3.0 Gbps (SStatus 123)
ata2: dev 0 cfg 49:2f00 82:0068 83:5060 84:4000 85:0000 86:1000 87:4000 
88:407f
ata2: dev 0 ATA-6, max UDMA/133, 640 sectors: LBA
ata2: dev 0 configured for UDMA/133


Thanks,
Berck

Re: 2.6.19-rc2-mm2 AHCI lengthy pause on detection

[Tejun Heo]

[-- Attachment #1: Type: text/plain, Size: 374 bytes --]

Berck E. Nash wrote:
> AHCI pauses heartily on during detection boot, but eventually proceeds. 
>  This problem currently exists with 2.6.19-rc2-mm1, but did not exist in 
> 2.6.17.3.  I realize that's a huge gap, and if you'd like me to narrow 
> it down, I'll be glad to try.

Can you try the attached patch?  And please post the result of hdparm -I 
/dev/sdX.

-- 
tejun

[-- Attachment #2: patch --]
[-- Type: text/plain, Size: 487 bytes --]

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 2592912..8215139 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -278,8 +278,7 @@ static const struct ata_port_info ahci_p
 	{
 		.sht		= &ahci_sht,
 		.flags		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
-				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
-				  ATA_FLAG_SKIP_D2H_BSY,
+				  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA,
 		.pio_mask	= 0x1f, /* pio0-4 */
 		.udma_mask	= 0x7f, /* udma0-6 ; FIXME */
 		.port_ops	= &ahci_ops,

Re: 2.6.19-rc2-mm2 AHCI lengthy pause on detection

[Berck E. Nash]

Tejun Heo wrote:
> Can you try the attached patch?  And please post the result of hdparm -I 
> /dev/sdX.

No difference with that patch.

/dev/sde:

ATA device, with non-removable media
         Model Number:       ST3250823AS
         Serial Number:      5ND0HPTV
         Firmware Revision:  3.03
Standards:
         Supported: 7 6 5 4
         Likely used: 7
Configuration:
         Logical         max     current
         cylinders       16383   16383
         heads           16      16
         sectors/track   63      63
         --
         CHS current addressable sectors:   16514064
         LBA    user addressable sectors:  268435455
         LBA48  user addressable sectors:  488397168
         device size with M = 1024*1024:      238475 MBytes
         device size with M = 1000*1000:      250059 MBytes (250 GB)
Capabilities:
         LBA, IORDY(can be disabled)
         Queue depth: 32
         Standby timer values: spec'd by Standard, no device specific 
minimum
         R/W multiple sector transfer: Max = 16  Current = 16
         Recommended acoustic management value: 128, current value: 0
         DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
              Cycle time: min=120ns recommended=120ns
         PIO: pio0 pio1 pio2 pio3 pio4
              Cycle time: no flow control=240ns  IORDY flow control=120ns
Commands/features:
         Enabled Supported:
            *    SMART feature set
                 Security Mode feature set
            *    Power Management feature set
            *    Write cache
            *    Look-ahead
            *    Host Protected Area feature set
            *    WRITE_BUFFER command
            *    READ_BUFFER command
            *    DOWNLOAD_MICROCODE
                 SET_MAX security extension
            *    48-bit Address feature set
            *    Device Configuration Overlay feature set
            *    Mandatory FLUSH_CACHE
            *    FLUSH_CACHE_EXT
            *    SMART error logging
            *    SMART self-test
            *    General Purpose Logging feature set
            *    SATA-I signaling speed (1.5Gb/s)
            *    Native Command Queueing (NCQ)
            *    Phy event counters
            *    Software settings preservation
Security:
         Master password revision code = 65534
                 supported
         not     enabled
         not     locked
                 frozen
         not     expired: security count
         not     supported: enhanced erase
Checksum: correct