On Wed, Dec 25, 2019 at 07:18:40PM +0100, Pali Rohár wrote: > Hello Sascha! > > On Friday 13 December 2019 09:04:08 Sascha Hauer wrote: > > ata_qc_complete_multiple() is called with a mask of the still active > > tags. > > > > mv_sata doesn't have this information directly and instead calculates > > the still active tags from the started tags (ap->qc_active) and the > > finished tags as (ap->qc_active ^ done_mask) > > > > Since 28361c40368 the hw_tag and tag are no longer the same and the > > equation is no longer valid. In ata_exec_internal_sg() ap->qc_active is > > initialized as 1ULL << ATA_TAG_INTERNAL, but in hardware tag 0 is > > started and this will be in done_mask on completion. ap->qc_active ^ > > done_mask becomes 0x100000000 ^ 0x1 = 0x100000001 and thus tag 0 used as > > the internal tag will never be reported as completed. > > > > This is fixed by introducing ata_qc_get_active() which returns the > > active hardware tags and calling it where appropriate. > > > > This is tested on mv_sata, but sata_fsl and sata_nv suffer from the same > > problem. There is another case in sata_nv that most likely needs fixing > > as well, but this looks a little different, so I wasn't confident enough > > to change that. > > I can confirm that sata_nv.ko does not work in 4.18 (and new) kernel > version correctly. More details are in email: > > https://lore.kernel.org/linux-ide/20191225180824.bql2o5whougii4ch@pali/T/ > > I tried this patch and it fixed above problems with sata_nv.ko. It just > needs small modification (see below). > > So you can add my: > > Tested-by: Pali Rohár <pali.rohar@xxxxxxxxx> > > And I hope that patch would be backported to 4.18 and 4.19 stable > branches soon as distributions kernels are broken for machines with > these nvidia sata controllers. > > Anyway, what is that another case in sata_nv which needs to be fixed > too? It's in nv_swncq_sdbfis(). Here we have: sactive = readl(pp->sactive_block); done_mask = pp->qc_active ^ sactive; pp->qc_active &= ~done_mask; pp->dhfis_bits &= ~done_mask; pp->dmafis_bits &= ~done_mask; pp->sdbfis_bits |= done_mask; ata_qc_complete_multiple(ap, ap->qc_active ^ done_mask); Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
