Julian Margetson <runaway@xxxxxxxx> writes: > On 12/20/2015 1:11 PM, Måns Rullgård wrote: >> Julian Margetson <runaway@xxxxxxxx> writes: >> >>> On 12/19/2015 4:41 PM, Måns Rullgård wrote: >>>> Andy Shevchenko <andy.shevchenko@xxxxxxxxx> writes: >>>> >>>>> On Sat, Dec 19, 2015 at 10:16 PM, Julian Margetson <runaway@xxxxxxxx> wrote: >>>>>> On 12/19/2015 3:07 PM, Måns Rullgård wrote: >>>>>>> Julian Margetson <runaway@xxxxxxxx> writes: >>>>>>>> Total pages: 522752 >>>>>>>> [ 0.000000] Kernel command line: root=/dev/sda8 console=ttyS0,115200 >>>>>>>> console=tty1 dw_dmac_core.dyndbg dw_dmac.dyndbg >>>>>>> Please add ignore_log_level. >>>>>>> >>>>>> Had to truncate the kernel command line to add it. >>>>> I guess Måns meant 'ignore_loglevel' >>>> Obviously. I can never remember where the underscores go. >>> [ 18.362244] sd 3:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB) >>> [ 18.372454] sd 3:0:0:0: Attached scsi generic sg3 type 0 >>> [ 18.405433] sd 3:0:0:0: [sdc] Write Protect is off >>> [ 18.420654] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00 >>> [ 18.461731] sd 3:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA >>> [ 18.502918] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: port=0 dma dir=from device n_elem=1 >>> [ 18.511807] dma dma0chan0: dwc_prep_slave_sg >>> [ 18.516083] dma dma0chan0: scanned 1 descriptors on freelist >>> [ 18.521753] sata-dwc 4bffd1000.sata: dma_dwc_xfer_setup sg: 0xedeaa800, count: 1 addr: 0xfffffffff6a14400 >>> [ 18.531327] sata-dwc 4bffd1000.sata: sata_dwc_qc_issue: tag=0 ap->link.sactive = 0x00000001 sactive=0x00000001 >>> [ 18.541359] sata-dwc 4bffd1000.sata: sata_dwc_exec_command_by_tag cmd(0x60): READ FPDMA QUEUED tag=0 >>> [ 18.553703] sata-dwc 4bffd1000.sata: sata_dwc_isr intpr=0x00000082 active_tag=-84148995 >>> [ 18.561717] sata-dwc 4bffd1000.sata: sata_dwc_isr: NEWFP tag=0 >>> [ 18.567561] sata-dwc 4bffd1000.sata: sata_dwc_bmdma_start_by_tag qc=ed2340b8 tag: 0 cmd: 0x60 dma_dir: from device start_dma? 1 >>> [ 18.579043] sata-dwc 4bffd1000.sata: taskfile cmd: 0x60 protocol: ATA NCQ flags: 0x17 device: 40 >>> [ 18.587836] sata-dwc 4bffd1000.sata: feature: 0x08 nsect: 0x0 lbal: 0x0 lbam: 0x0 lbah: 0x0 >>> [ 18.596196] sata-dwc 4bffd1000.sata: hob_feature: 0x00 hob_nsect: 0x0 hob_lbal: 0x0 hob_lbam: 0x0 hob_lbah: 0x0 >>> [ 18.606292] dma dma0chan0: dwc_tx_submit: queued 2 >>> [ 18.611091] dma dma0chan0: dwc_dostart_first_queued: started 2 >>> [ 48.748614] ata3: lost interrupt (Status 0x40) >> Now we're getting somewhere. The dma transfer is set up and initiated, >> but then nothing happens. Comparing the old sata_dwc driver, from >> before the switch to dmaengine, with the dw_dma driver, I noticed an >> obvious problem: the descriptors are filled in using the wrong byte >> order. This patch might fix that. > > [ 18.534844] ata3.00: configured for UDMA/133 > [ 18.538182] scsi 3:0:0:0: Direct-Access ATA WDC WD5000AAKS-0 3B01 PQ: 0 ANSI: 5 > [ 18.539025] sd 3:0:0:0: [sdc] 976773168 512-byte logical blocks: (500 GB/465 GiB) > [ 18.539236] sd 3:0:0:0: [sdc] Write Protect is off > [ 18.539245] sd 3:0:0:0: [sdc] Mode Sense: 00 3a 00 00 > [ 18.539338] sd 3:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA > [ 18.540049] sd 3:0:0:0: Attached scsi generic sg3 type 0 > [ 18.540362] sata-dwc 4bffd1000.sata: sata_dwc_qc_prep_by_tag: port=0 dma dir=from device n_elem=1 > [ 18.540370] dma dma0chan0: dwc_prep_slave_sg > [ 18.540378] dma dma0chan0: scanned 1 descriptors on freelist > [ 18.540387] sata-dwc 4bffd1000.sata: dma_dwc_xfer_setup sg: 0xed37f200, count: 1 addr: 0xfffffffff6a18400 > [ 18.540395] sata-dwc 4bffd1000.sata: sata_dwc_qc_issue: tag=0 ap->link.sactive = 0x00000001 sactive=0x00000001 > [ 18.540426] sata-dwc 4bffd1000.sata: sata_dwc_exec_command_by_tag cmd(0x60): READ FPDMA QUEUED tag=0 > [ 18.556592] sata-dwc 4bffd1000.sata: sata_dwc_isr intpr=0x00000082 active_tag=-84148995 > [ 18.556599] sata-dwc 4bffd1000.sata: sata_dwc_isr: NEWFP tag=0 > [ 18.556609] sata-dwc 4bffd1000.sata: sata_dwc_bmdma_start_by_tag qc=ed2180b8 tag: 0 cmd: 0x60 dma_dir: from device start_dma? 1 > [ 18.556616] sata-dwc 4bffd1000.sata: taskfile cmd: 0x60 protocol: ATA NCQ flags: 0x17 device: 40 > [ 18.556623] sata-dwc 4bffd1000.sata: feature: 0x08 nsect: 0x0 lbal: 0x0 lbam: 0x0 lbah: 0x0 > [ 18.556631] sata-dwc 4bffd1000.sata: hob_feature: 0x00 hob_nsect: 0x0 hob_lbal: 0x0 hob_lbam: 0x0 hob_lbah: 0x0 > [ 18.556639] dma dma0chan0: dwc_tx_submit: queued 2 > [ 18.556646] dma dma0chan0: dwc_dostart_first_queued: started 2 > [ 48.748634] ata3: lost interrupt (Status 0x40) > [ 48.753465] sata-dwc 4bffd1000.sata: sata_dwc_scr_read: id=3 reg=1 val=val=0x00000000 > [ 48.761369] ata3.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen > [ 48.769671] ata3.00: failed command: READ FPDMA QUEUED Well, that didn't help. I still think it's part of the problem, but something else must be wrong as well. The various Master Select fields look like a good place to start. Also, the manual says the LLP_SRC_EN and LLP_DST_EN flags should be cleared on the last in a chain of blocks. The old sata_dwc driver does this whereas dw_dma does not. It might be worthwhile to try reverting drivers/ata/sata_dwc_460ex.c to v4.0 (leaving the rest at 4.4-rc5) just to make sure that's a good reference. I've verified that this builds. -- Måns Rullgård -- 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
