On Wed, Oct 28, 2009 at 9:51 AM, Mark Nelson <mdnelson8@xxxxxxxxx> wrote: > Adding back linux-ide and Jeff (accidentally dropped them off on my first reply) > > On Wed, Oct 28, 2009 at 5:13 AM, Tejun Heo <tj@xxxxxxxxxx> wrote: >> Hello, Mark. >> >> Mark Nelson wrote: >>>>From reading this bug report: >>> http://bugzilla.kernel.org/show_bug.cgi?id=14275 >>> it sounds like when the SB600 can't do 64bit DMA the machine can fail to boot. >>> >>> I've been using the system with a patch that removes the AHCI_HFLAG_32BIT_ONLY >>> from board_ahci_sb600 for a few months now, but the system only has 4GB of RAM, >>> with some of it hoisted over the 32bit mark: >>> >>> Memory: 4048052k/4980736k available (2010k kernel code, 145176k >>> reserved, 922k data, 228k init) >>> >>> This probably isn't a rigorous enough test though... What is the best way to >>> verify it (and that way I can check more BIOS versions)? >> >> The surest way would be to put one time printk which prints out the >> physical dma address if it's above 4G in the issue path. Something >> like the following (completely untested). >> >> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c >> index b1a2577..08b987d 100644 >> --- a/drivers/ata/ahci.c >> +++ b/drivers/ata/ahci.c >> @@ -2019,6 +2019,11 @@ static unsigned int ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl) >> for_each_sg(qc->sg, sg, qc->n_elem, si) { >> dma_addr_t addr = sg_dma_address(sg); >> u32 sg_len = sg_dma_len(sg); >> + static int cnt; >> + >> + if (addr > 0xffffffffULL && !(cnt++ % 500)) >> + printk("ahci: dma'ing to address 0x%llx\n", >> + (unsigned long long)addr); >> >> ahci_sg[si].addr = cpu_to_le32(addr & 0xffffffff); >> ahci_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16); >> > > That looks good. I'll have a play with it and see what I get. > Things look promising so far with lots of DMAs above 4GB (snippets from syslog): ahci 0000:00:12.0: version 3.0 ahci 0000:00:12.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 ahci 0000:00:12.0: MSI K9A2 Platinum: enabling 64bit DMA ahci 0000:00:12.0: AHCI 0001.0100 32 slots 4 ports 3 Gbps 0xf impl SATA mode ahci 0000:00:12.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part ccc scsi0 : ahci scsi1 : ahci scsi2 : ahci scsi3 : ahci ata1: SATA max UDMA/133 irq_stat 0x00400000, PHY RDY changed irq 22 ata2: SATA max UDMA/133 abar m1024@0xfbcff800 port 0xfbcff980 irq 22 ata3: SATA max UDMA/133 abar m1024@0xfbcff800 port 0xfbcffa00 irq 22 ata4: SATA max UDMA/133 abar m1024@0xfbcff800 port 0xfbcffa80 irq 22 pata_atiixp 0000:00:14.1: PCI INT A -> GSI 16 (level, low) -> IRQ 16 pata_atiixp 0000:00:14.1: setting latency timer to 64 scsi4 : pata_atiixp scsi5 : pata_atiixp ata5: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14 ata6: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0xff08 irq 15 ata5.00: ATAPI: PIONEER DVD-RW DVR-111D, 1.29, max UDMA/66 ata5.01: ATAPI: HL-DT-ST GCE-8520B, 1.02, max UDMA/33 ata5.00: configured for UDMA/66 ata5.01: configured for UDMA/33 ata3: SATA link down (SStatus 0 SControl 300) ata4: SATA link down (SStatus 0 SControl 300) ata2: SATA link down (SStatus 0 SControl 300) ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) ahci: dma'ing to address 0x12ee49ed8 ata1.00: ATA-7: ST3320620AS, 3.AAD, max UDMA/133 ata1.00: 625142448 sectors, multi 16: LBA48 NCQ (depth 31/32) ata1.00: SB600 AHCI: limiting to 255 sectors per cmd ata1.00: SB600 AHCI: limiting to 255 sectors per cmd ata1.00: configured for UDMA/133 scsi 0:0:0:0: Direct-Access ATA ST3320620AS 3.AA PQ: 0 ANSI: 5 sd 0:0:0:0: [sda] 625142448 512-byte logical blocks: (320 GB/298 GiB) 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: scsi 4:0:0:0: CD-ROM PIONEER DVD-RW DVR-111D 1.29 PQ: 0 ANSI: 5 sr0: scsi3-mmc drive: 62x/62x writer cd/rw xa/form2 cdda tray Uniform CD-ROM driver Revision: 3.20 sr 4:0:0:0: Attached scsi CD-ROM sr0 scsi 4:0:1:0: CD-ROM HL-DT-ST CD-RW GCE-8520B 1.02 PQ: 0 ANSI: 5 sr1: scsi3-mmc drive: 40x/52x writer cd/rw xa/form2 cdda tray sr 4:0:1:0: Attached scsi CD-ROM sr1 sda1 sda2 sda3 sda4 < sda5 sda6 > sd 0:0:0:0: [sda] Attached SCSI disk EXT4-fs (sda5): mounted filesystem with ordered data mode VFS: Mounted root (ext4 filesystem) readonly on device 8:5. Freeing unused kernel memory: 392k freed ahci: dma'ing to address 0x12e9a8000 ahci: dma'ing to address 0x12e57a000 ahci: dma'ing to address 0x12d455000 sd 0:0:0:0: Attached scsi generic sg0 type 0 sr 4:0:0:0: Attached scsi generic sg1 type 5 sr 4:0:1:0: Attached scsi generic sg2 type 5 ahci: dma'ing to address 0x12e13f000 ahci: dma'ing to address 0x12dd65000 ahci: dma'ing to address 0x12e594000 ahci: dma'ing to address 0x12e29a000 ahci: dma'ing to address 0x12df02000 ahci: dma'ing to address 0x12cf0d200 Adding 4939948k swap on /dev/sda6. Priority:-1 extents:1 across:4939948k ahci: dma'ing to address 0x12d774000 ahci: dma'ing to address 0x12c40c000 ahci: dma'ing to address 0x12c01a000 ahci: dma'ing to address 0x12c3ac000 ahci: dma'ing to address 0x12beca000 ahci: dma'ing to address 0x12b25a000 ahci: dma'ing to address 0x1294b5000 ahci: dma'ing to address 0x12905d000 ahci: dma'ing to address 0x12934a000 ahci: dma'ing to address 0x1287df000 ahci: dma'ing to address 0x1289c2000 ahci: dma'ing to address 0x1264f0000 ahci: dma'ing to address 0x1268a7000 ahci: dma'ing to address 0x1262ab000 ahci: dma'ing to address 0x12501b000 ahci: dma'ing to address 0x124162000 ahci: dma'ing to address 0x1261a1000 ahci: dma'ing to address 0x12362c000 ahci: dma'ing to address 0x122b1a000 ahci: dma'ing to address 0x121887000 ahci: dma'ing to address 0x12101c000 ahci: dma'ing to address 0x120b4b000 ahci: dma'ing to address 0x11f56b000 ahci: dma'ing to address 0x11ef71000 ahci: dma'ing to address 0x120314000 ahci: dma'ing to address 0x1274e9000 ahci: dma'ing to address 0x11e129000 ahci: dma'ing to address 0x11d065000 ahci: dma'ing to address 0x11cefe000 ahci: dma'ing to address 0x11c607000 ahci: dma'ing to address 0x11c384000 ahci: dma'ing to address 0x1194bb000 ahci: dma'ing to address 0x11881e000 ahci: dma'ing to address 0x118669000 ahci: dma'ing to address 0x1178e7000 ahci: dma'ing to address 0x116c0c000 ahci: dma'ing to address 0x116b1b000 ahci: dma'ing to address 0x1167fe000 ahci: dma'ing to address 0x11550f000 ahci: dma'ing to address 0x114cd3000 ahci: dma'ing to address 0x1147c9000 ahci: dma'ing to address 0x12464a000 ahci: dma'ing to address 0x11cf76000 ahci: dma'ing to address 0x111970000 ahci: dma'ing to address 0x110bbf000 This was running with BIOS version 1.8. I'll try to test more BIOS revisions to work out exactly which ones work with 64bit DMA. Thanks! Mark -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
