linux-kernel - Re: serverworks CSB5 IDE: DMA disabled on secondary channel

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Message-ID: <48815567.2080001@hanzlici.cz>
Date:	Sat, 19 Jul 2008 04:45:59 +0200
From:	Frantisek Hanzlik <franta@...zlici.cz>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Robert Hancock <hancockr@...w.ca>, linux-kernel@...r.kernel.org
Subject: Re: serverworks CSB5 IDE: DMA disabled on secondary channel

Alan Cox wrote:
>>> ata2.01: ATAPI: CD-W540E, 1.0D, max UDMA/33
>>> ata2.00: simplex DMA is claimed by other device, disabling DMA
>>> ata2.01: simplex DMA is claimed by other device, disabling DMA
>>> ata2.00: configured for PIO4
>>> ata2.01: configured for PIO4
>
>
> Disable the pata_acpi driver and let me know if it then behaves. We had a
> similar problem with the ATI hardware which lost and messed up its
> internal state if pata_acpi was loaded first.
>
Before I post to lkml I tried disable ata_generic driver, (which was loaded
before pata_serverworks too, my mail already not show it as is blacklisted),
but this not solved problem. YES, problem was in pata_acpi, after disabling
it all works fine (no matter if is ata_generic enabled and loaded before
pata_serverworks or not).
What is the meaning of "simplex DMA is claimed..." I probably must learn in
sources itself ;)
Many thanks, Alan, You are big magicians!

dmesg:
...
libata version 3.00 loaded.
scsi0 : pata_serverworks
scsi1 : pata_serverworks
ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x2440 irq 14
ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x2448 irq 15
ata1.00: ATA-7: ST3400620A, 3.AAE, max UDMA/100
ata1.00: 781422768 sectors, multi 16: LBA48
ata1.01: ATAPI: TOSHIBA DVD-ROM SD-M1612, 1004, max UDMA/33
ata1.00: configured for UDMA/100
ata1.01: configured for UDMA/33
ata2.00: ATA-7: ST3400620A, 3.AAE, max UDMA/100
ata2.00: 781422768 sectors, multi 16: LBA48
ata2.01: ATAPI: CD-W540E, 1.0D, max UDMA/33
ata2.00: configured for UDMA/100
ata2.01: configured for UDMA/33
scsi 0:0:0:0: Direct-Access     ATA      ST3400620A       3.AA PQ: 0 ANSI: 5
sd 0:0:0:0: [sda] 781422768 512-byte hardware sectors (400088 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 0:0:0:0: [sda] 781422768 512-byte hardware sectors (400088 MB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  sda: sda1 sda2 sda3 sda4
sd 0:0:0:0: [sda] Attached SCSI disk
scsi 0:0:1:0: CD-ROM            TOSHIBA  DVD-ROM SD-M1612 1004 PQ: 0 ANSI: 5
scsi 1:0:0:0: Direct-Access     ATA      ST3400620A       3.AA PQ: 0 ANSI: 5
sd 1:0:0:0: [sdb] 781422768 512-byte hardware sectors (400088 MB)
sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 1:0:0:0: [sdb] 781422768 512-byte hardware sectors (400088 MB)
sd 1:0:0:0: [sdb] Write Protect is off
sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  sdb: sdb1 sdb2 sdb3 sdb4
sd 1:0:0:0: [sdb] Attached SCSI disk
scsi 1:0:1:0: CD-ROM            TEAC     CD-W540E         1.0D PQ: 0 ANSI: 5
md: md0 stopped.
md: bind<sdb1>
md: bind<sda1>
raid1: raid set md0 active with 2 out of 2 mirrors
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
...


# hdparm -Tt /dev/sda
/dev/sda:
  Timing cached reads:   732 MB in  2.00 seconds = 366.18 MB/sec
  Timing buffered disk reads:  206 MB in  3.01 seconds =  68.40 MB/sec

# hdparm -Tt /dev/sdb
/dev/sdb:
  Timing cached reads:   806 MB in  2.00 seconds = 402.65 MB/sec
  Timing buffered disk reads:  202 MB in  3.03 seconds =  66.72 MB/sec



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