Re: DMA gone on ALI 1533

[Bartlomiej Zolnierkiewicz]

It seems you forgot to compile in support for ALI chipset.
Make sure you have CONFIG_BLK_DEV_ALI15X3=y in your config.
If it doesn't help let me know.

Please also read below...

On Thu, 22 May 2003, Peter wrote:

> The 2.5.69 kernel kicks butt -- Debian is now releasing a version in sid
> and it runs stable on my vpr matrix 205A laptop. What works: nfs, samba,
> v4l, the nVidia driver (patched), everything I've tested so far. And sound
> -- the ALSA sound is great (headphone jack still dead). ACPI now detects
> my battery, and I'm working on software suspend.
>
> The ALI chipset (1671 northbridge, 1533 ISA bridge, 5229 IDE interface,
> 7101 bridge) gives me
> DMA 33 with 2.4.20:
>
>     hda: 78140160 sectors (40008 MB) w/1768KiB Cache, CHS=4864/255/63, UDMA(33)
>
> but no dma with 2.5.69.  Timing buffered disk reads now come in at
> 3.17MB/s -- in 2.4.20 I get 19.88 MB/sec. hdparm gives part number
> IC25N040ATCS04-0, a Travelstar 40GN, which I believe supports a 100MHz
> bus. The "idebus=66" never made a difference afaict.
>
> Aside from the slower harddrive (see details below), I've had no issues
> with this kernel.
>
> Is there a workaround for the dma, or something I'm missing? Incidentally,
> it would be handy to have a bit more information in dmesg, along the lines
> of the 2.4 kernel -- chipset, dma and bus speed per drive.
>
> Cheers,
> Peter
>
>
>
>
> dmesg 2.5.69:
>
> Kernel command line: root=/dev/hda5 ro hdc=scsi idebus=66 resume=/dev/hda6
> ide_setup: hdc=scsi
> ide_setup: idebus=66
> No local APIC present or hardware disabled
>
> PCI: PCI BIOS revision 2.10 entry at 0xfd88e, last bus=1
> PCI: Using configuration type 1
>
> PCI: Using ACPI for IRQ routing
> PCI: if you experience problems, try using option 'pci=noacpi' or even 'acpi=off'
>
> Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
> ide: Assuming 66MHz system bus speed for PIO modes
> hda: IC25N040ATCS04-0, ATA DISK drive
> hdc: MATSHITACD-RW CW-8121, ATAPI CD/DVD-ROM drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> hda: host protected area => 1
> hda: 78140160 sectors (40008 MB) w/1768KiB Cache, CHS=77520/16/63
>  hda: hda1 hda2 < hda5 hda6 hda7 > hda3 hda4
> ide-cd: passing drive hdc to ide-scsi emulation.

Interfaces were taken by generic code, no ALI driver here.

> hdparm -i claims to be using dma5:
>
> hdparm -i /dev/hda
>
> /dev/hda:
>
>  Model=IC25N040ATCS04-0, FwRev=CA4OA71A, SerialNo=CSH405DCLW5UVB
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
>  BuffType=DualPortCache, BuffSize=1768kB, MaxMultSect=16, MultSect=off
>  CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78140160
>  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes:  pio0 pio1 pio2 pio3 pio4
>  DMA modes:  mdma0 mdma1 mdma2
>  UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
>  AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
>  Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3:  2 3 4 5
>
> In contrast, hdparm /dev/hda claims dma is off:
>
> # hdparm /dev/hda
>
> /dev/hda:
>  multcount    =  0 (off)
>  IO_support   =  0 (default 16-bit)
>  unmaskirq    =  0 (off)
>  using_dma    =  0 (off)
>  keepsettings =  0 (off)
>  readonly     =  0 (off)
>  readahead    = 256 (on)
>  geometry     = 11984/16/63, sectors = 78140160, start = 0
>
> The disk read speed in 2.5.69 indicates dma is off:
>
> # hdparm -tT /dev/hda
>
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  0.46 seconds =280.74 MB/sec
>  Timing buffered disk reads:  64 MB in 20.18 seconds =  3.17 MB/sec
>
> # cat kernel-2.5.69.config | grep DMA
> CONFIG_GENERIC_ISA_DMA=y
> CONFIG_BLK_DEV_IDEDMA_PCI=y
> # CONFIG_BLK_DEV_IDEDMA_FORCED is not set
> CONFIG_IDEDMA_PCI_AUTO=y
> # CONFIG_IDEDMA_ONLYDISK is not set
> CONFIG_BLK_DEV_IDEDMA=y
> # CONFIG_IDEDMA_PCI_WIP is not set
> CONFIG_BLK_DEV_ADMA=y
> CONFIG_IDEDMA_AUTO=y
> # CONFIG_IDEDMA_IVB is not set
> # CONFIG_IEEE1394_SBP2_PHYS_DMA is not set
>
> Here's what 2.4.20 produces:
>
> Uniform Multi-Platform E-IDE driver Revision: 6.31
> ide: Assuming 66MHz system bus speed for PIO modes
> ALI15X3: IDE controller on PCI bus 00 dev 80
> PCI: No IRQ known for interrupt pin A of device 00:10.0.
> ALI15X3: chipset revision 196
> ALI15X3: not 100% native mode: will probe irqs later
>     ide0: BM-DMA at 0x1840-0x1847, BIOS settings: hda:DMA, hdb:pio
>     ide1: BM-DMA at 0x1848-0x184f, BIOS settings: hdc:pio, hdd:pio
> hda: IC25N040ATCS04-0, ATA DISK drive
> hdc: MATSHITACD-RW CW-8121, ATAPI CD/DVD-ROM drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> blk: queue c0335ee4, I/O limit 4095Mb (mask 0xffffffff)
> hda: 78140160 sectors (40008 MB) w/1768KiB Cache, CHS=4864/255/63, UDMA(33)

ALI driver compiled in.

> Disk information under 2.4.20 -- claims to be using dma2:
>
> Model=IC25N040ATCS04-0, FwRev=CA4OA71A, SerialNo=CSH405DCLW5UVB
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
> RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=DualPortCache, BuffSize=1768kB, MaxMultSect=16, MultSect=16
> CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78140160
> IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
> PIO modes: pio0 pio1 pio2 pio3 pio4
> DMA modes: mdma0 mdma1 mdma2
> UDMA modes: udma0 udma1 *udma2 udma3 udma4 udma5
> AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
> Drive conforms to: ATA/ATAPI-5 T13 1321D revision 3: 2 3 4 5
>
> This fits with the disk read speed:
>
> Timing buffer-cache reads: 128 MB in 0.44 seconds =290.91 MB/sec
> Timing buffered disk reads: 64 MB in 3.22 seconds = 19.88 MB/sec
>
> cat kernel-2.4.20-5-5.config | grep DMA

'grep DMA' is really not sufficient,
you need driver for your IDE chipset first.

Regards,
--
Bartlomiej

> CONFIG_BLK_DEV_IDEDMA_PCI=y
> # CONFIG_BLK_DEV_IDEDMA_FORCED is not set
> CONFIG_IDEDMA_PCI_AUTO=y
> # CONFIG_IDEDMA_ONLYDISK is not set
> CONFIG_BLK_DEV_IDEDMA=y
> # CONFIG_IDEDMA_PCI_WIP is not set
> # CONFIG_BLK_DEV_IDEDMA_TIMEOUT is not set
> # CONFIG_IDEDMA_NEW_DRIVE_LISTINGS is not set
> CONFIG_BLK_DEV_ADMA=y
> # CONFIG_HPT34X_AUTODMA is not set
> CONFIG_IDEDMA_AUTO=y
> # CONFIG_IDEDMA_IVB is not set
> # CONFIG_DMA_NONPCI is not set
> # CONFIG_SCSI_EATA_DMA is not set
> # CONFIG_IEEE1394_SBP2_PHYS_DMA is not set
> # CONFIG_SOUND_DMAP is not set