On Sat, 21 Nov 2015, Ondrej Zary wrote:
> On Saturday 21 November 2015 02:58:57 Finn Thain wrote:
>
> >
> > I gather that your setup here is a QUANTUM LP240S target with Domex
> > 3181 (DTC-436) card and g_NCR5380 module. I've been testing a similar
> > setup: QUANTUM LPS540S target with a Domex 3191D (DTC-536) card and
> > dmx3191d module. In both setups PIO is used exclusively, no IRQ is
> > used, and FLAG_DTC3181E is set. I didn't see any issues in my tests,
> > so your results are surprising.
>
> I agree that the results are surprising. Even tried 2.4 kernels (Debian
> 3.1) and even 2.2 (Debian 3.0) and nothing worked. HW is fine - the
> drive is accessible in Windows 98 (with Domex driver installed).
That's good to know (and very thorough).
>
> Now testing the Canon FG2-5202 controller - a simple 8-bit ISA card with
> only two chips: NCR 53C400 and 74LS245. It's memory mapped, IRQ
> hardwired to 7.
>
> # modprobe g_NCR5380_mmio ncr_irq=255 ncr_addr=0xd8000 ncr_53c400=1
>
> [ 1245.919223] scsi2 : interrupts not enabled. for better interactive performance,
> [ 1245.919326] scsi2 : please jumper the board for a free IRQ.
> [ 1245.919389] scsi host2: Generic NCR5380/NCR53C400 SCSI, io_port 0x0, n_io_port 0, base 0xd8000, irq 0, can_queue 16, cmd_per_lun 2, sg_tablesize 128, this_id 7, flags { NCR53C400 }, USLEEP_POLL 3, USLEEP_WAITLONG 1250, options { AUTOPROBE_IRQ PSEUDO_DMA NCR53C400 }
> [ 1246.376738] scsi 2:0:1:0: Direct-Access QUANTUM LP240S GM240S01X 4.6 PQ: 0 ANSI: 2 CCS
> [ 1248.202198] sd 2:0:1:0: Attached scsi generic sg1 type 0
> [ 1248.420856] 53C400r: no 53C80 gated irq after transfer
> [ 1248.420948] 53C400r: no end dma signal
> [ 1248.422459] sd 2:0:1:0: [sdb] Sector size 0 reported, assuming 512.
>
> Seems that the PSEUDO_DMA is broken.
That's been my experience with mac_scsi also (going back 10 years). I'm
told that it used to work in v2.2. PIO was always usable though hopelessly
slow.
I haven't yet done any work on the PDMA problem with mac_scsi because
crashing bugs and the forked core driver seemed to be the more pressing
problems. And resolving the fork has implications for all of the DMA
variations anyway.
> After adding FLAG_NO_PSEUDO_DMA:
>
> # modprobe g_NCR5380_mmio ncr_irq=255 ncr_addr=0xd8000 ncr_53c400=1
>
> [ 67.974362] scsi2 : interrupts not enabled. for better interactive performance,
> [ 67.974463] scsi2 : please jumper the board for a free IRQ.
> [ 67.974526] scsi host2: Generic NCR5380/NCR53C400 SCSI, io_port 0x0, n_io_port 0, base 0xd8000, irq 0, can_queue 16, cmd_per_lun 2, sg_tablesize 128, this_id 7, flags { NCR53C400 NO_PSEUDO_DMA }, USLEEP_POLL 3, USLEEP_WAITLONG 1250, options { AUTOPROBE_IRQ PSEUDO_DMA NCR53C400 }
> [ 68.432728] scsi 2:0:1:0: Direct-Access QUANTUM LP240S GM240S01X 4.6 PQ: 0 ANSI: 2 CCS
> [ 70.258258] sd 2:0:1:0: Attached scsi generic sg1 type 0
> [ 70.277265] sd 2:0:1:0: [sdb] 479350 512-byte logical blocks: (245 MB/234 MiB)
> [ 70.482252] sd 2:0:1:0: [sdb] Write Protect is off
> [ 70.482335] sd 2:0:1:0: [sdb] Mode Sense: 8b 00 00 08
> [ 70.889646] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> [ 73.159513] sdb: sdb1
> [ 74.617099] sd 2:0:1:0: [sdb] Attached SCSI disk
>
> Yeah, first success! I can even mount the filesystem, although it takes ages
> (a minute) and these messages:
> [ 160.872074] sd 2:0:1:0: [sdb] aborting command
> [ 161.816083] sd 2:0:1:0: [sdb] aborting command
>
> # hdparm -t --direct /dev/sdb
>
> /dev/sdb:
> [ 244.840075] sd 2:0:1:0: [sdb] aborting command
> [ 248.824078] sd 2:0:1:0: [sdb] aborting command
> [ 293.864069] sd 2:0:1:0: [sdb] aborting command
> [ 297.824075] sd 2:0:1:0: [sdb] aborting command
> [ 319.765020] blk_update_request: critical target error, dev sdb, sector 0
> [ 319.972994] blk_update_request: critical target error, dev sdb, sector 0
> Timing O_DIRECT disk reads: 2 MB in 105.26 seconds = 19.46 kB/sec
>
>
>
> With your patches (and adding FLAG_NO_PSEUDO_DMA), modprobe is slower but
> mount faster (4 seconds) and then works better:
>
> # modprobe g_NCR5380_mmio ncr_irq=255 ncr_addr=0xd8000 ncr_53c400=1
>
> [ 130.126185] scsi2 : interrupts not enabled. for better interactive performance,
> [ 130.126284] scsi2 : please jumper the board for a free IRQ.
> [ 130.126347] scsi host2: Generic NCR5380/NCR53C400 SCSI, io_port 0x0, n_io_port 0, base 0xd8000, irq 0, can_queue 16, cmd_per_lun 2, sg_tablesize 128, this_id 7, flags { NO_PSEUDO_DMA }, options { AUTOPROBE_IRQ PSEUDO_DMA }
> [ 145.221755] scsi 2:0:1:0: Direct-Access QUANTUM LP240S GM240S01X 4.6 PQ: 0 ANSI: 2 CCS
> [ 220.629912] sd 2:0:1:0: Attached scsi generic sg1 type 0
> [ 220.651400] sd 2:0:1:0: [sdb] 479350 512-byte logical blocks: (245 MB/234 MiB)
> [ 220.654061] sd 2:0:1:0: [sdb] Write Protect is off
> [ 220.659344] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> [ 220.732415] sdb: sdb1
> [ 220.749760] sd 2:0:1:0: [sdb] Attached SCSI disk
>
> # hdparm -t --direct /dev/sdb
>
> /dev/sdb:
> Timing O_DIRECT disk reads: 2 MB in 18.25 seconds = 112.20 kB/sec
>
>
>
> IRQ seems to work too, although driver always shows "irq 0":
Your right, there's a superficial bug there that affects the banner in the
log. But it doesn't affect behaviour (the IRQ should still work). It isn't
a new bug.
>
> # modprobe g_NCR5380_mmio ncr_irq=7 ncr_addr=0xd8000 ncr_53c400=1
>
> [ 117.263062] scsi host2: Generic NCR5380/NCR53C400 SCSI, io_port 0x0, n_io_port 0, base 0xd8000, irq 0, can_queue 16, cmd_per_lun 2, sg_tablesize 128, this_id 7, flags { NO_PSEUDO_DMA }, options { AUTOPROBE_IRQ PSEUDO_DMA }
> [ 132.357474] scsi 2:0:1:0: Direct-Access QUANTUM LP240S GM240S01X 4.6 PQ: 0 ANSI: 2 CCS
> [ 207.765080] sd 2:0:1:0: Attached scsi generic sg1 type 0
> [ 207.783415] sd 2:0:1:0: [sdb] 479350 512-byte logical blocks: (245 MB/234 MiB)
> [ 207.786167] sd 2:0:1:0: [sdb] Write Protect is off
> [ 207.790260] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
> [ 207.859669] sdb: sdb1
> [ 207.876556] sd 2:0:1:0: [sdb] Attached SCSI disk
>
> # hdparm -t --direct /dev/sdb
>
> /dev/sdb:
> Timing O_DIRECT disk reads: 2 MB in 18.30 seconds = 111.94 kB/sec
>
> # mount /dev/sdb1 /mnt
> # umount /mnt
> # head /proc/interrupts
> CPU0
> 0: 44793 XT-PIC timer
> 1: 9 XT-PIC i8042
> 2: 0 XT-PIC cascade
> 7: 86 XT-PIC NCR5380
> 8: 1 XT-PIC rtc0
> 9: 0 XT-PIC uhci_hcd:usb1, uhci_hcd:usb2
> 10: 1179 XT-PIC eth0
> 12: 136 XT-PIC i8042
> 14: 3411 XT-PIC pata_via
>
Nice! Thanks for your perseverance. It is gratifying to see it working.
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