On 11/21/22 15:22, Helge Deller wrote:
On 11/21/22 14:16, Christoph Hellwig wrote:
currently parisc has it's own implementation of the dma-coherent
allocator that sets up PTEs with the uncached bit. I can't see any
reason why using vmap to do the same kind of setup shouldn't work.
This small series shows how that could work, but due to a lack of
actual parisc hardware it is compile tested only and not only needs
a careful review but also actual testing on hardware.
Very interesting!
I'll give it a spin on real hardware and will come back with the results...
kernel builds & boots with those patches.
SCSI drives are detected, but SCSI communication fails afterwards:
[ 13.509173] zalon_probe: Zalon version 1, IRQ 68
[ 13.564410] ncr53c720-0: rev 0xf irq 68
[ 13.614207] ncr53c720-0: ID 7, Fast-10, Parity Checking, Differential
[ 13.696785] scsi host0: ncr53c8xx-3.4.3g
[ 17.575885] scsi 0:0:6:0: Direct-Access SEAGATE ST32171W HP03 PQ: 0 ANSI: 2
[ 17.673111] scsi target0:0:6: Beginning Domain Validation
[ 17.742479] scsi target0:0:6: asynchronous
[ 17.806301] scsi target0:0:6: wide asynchronous
[ 17.871736] scsi target0:0:6: FAST-10 WIDE SCSI 20.0 MB/s ST (100 ns, offset 8)
[ 17.965723] scsi target0:0:6: Domain Validation skipping write tests
[ 18.041560] scsi target0:0:6: Ending Domain Validation
[ 20.448322] 53c700: Version 2.8 By James.Bottomley@xxxxxxxxxxxxxxxxxxxxx
[ 20.528403] scsi1: 53c710 rev 2
[ 21.567995] scsi host1: LASI SCSI 53c700
[ 21.936685] scsi 1:0:1:0: CD-ROM PHILIPS PCA80SC V3-0 PQ: 0 ANSI: 2
[ 22.033927] scsi target1:0:1: Beginning Domain Validation
[ 22.100102] scsi target1:0:1: asynchronous
[ 22.161326] scsi target1:0:1: FAST-10 SCSI 10.0 MB/s ST (100 ns, offset 8)
[ 22.250962] scsi target1:0:1: Domain Validation skipping write tests
[ 22.326829] scsi target1:0:1: Ending Domain Validation
[ 23.972351] st: Version 20160209, fixed bufsize 32768, s/g segs 256
[ 24.052265] sd 0:0:6:0: Power-on or device reset occurred
[ 24.117020] sr 1:0:1:0: Power-on or device reset occurred
[ 24.185309] sd 0:0:6:0: [sda] 4194685 512-byte logical blocks: (2.15 GB/2.00 GiB)
[ 24.279279] sd 0:0:6:0: [sda] Write Protect is off
[ 24.336921] sr 1:0:1:0: [sr0] scsi-1 drive
[ 24.386003] cdrom: Uniform CD-ROM driver Revision: 3.20
[ 24.451015] sd 0:0:6:0: [sda] Write cache: disabled, read cache: enabled, supports DPO and FUA
[ 24.569057] sd 0:0:6:0: Attached scsi generic sg0 type 0
[ 24.634080] sr 1:0:1:0: Attached scsi generic sg1 type 5
...
[ 28.246342] EXT4-fs (sda5): mounting ext3 file system using the ext4 subsystem
[ 28.338790] ncr53c720-0:6: ERROR (81:0) (0-0-0) (8/1b) @ (mem 43c:00000000).
[ 28.343500] ncr53c720-0: regdump:
[ 28.343500] da
[ 28.343500] 10
[ 28.343500] c0
[ 28.343500] 1b
[ 28.343500] 47
[ 28.343500] 08
[ 28.343500] 06
[ 28.343500] 07
[ 28.343500] 45
[ 28.343500] 08
[ 28.343500] 86
[ 28.343500] af
[ 28.343500] 80
[ 28.343500] 00
[ 28.343500] 07
[ 28.343500] 0b
[ 28.343500] .
Helge
