Hello, Have we decided anything on this patch? Thanks, Tejas > -----Original Message----- > From: Surendrakumar Upadhyay, TejaskumarX > Sent: 03 December 2020 21:40 > To: Bjorn Helgaas <helgaas@xxxxxxxxxx>; Joonas Lahtinen > <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Jesse Barnes <jsbarnes@xxxxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; > Linux PCI <linux-pci@xxxxxxxxxxxxxxx>; Linux Kernel Mailing List <linux- > kernel@xxxxxxxxxxxxxxx>; X86 ML <x86@xxxxxxxxxx>; Borislav Petkov > <bp@xxxxxxxxx>; De Marchi, Lucas <lucas.demarchi@xxxxxxxxx>; Roper, > Matthew D <matthew.d.roper@xxxxxxxxx>; Pandey, Hariom > <hariom.pandey@xxxxxxxxx>; Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>; Vivi, > Rodrigo <rodrigo.vivi@xxxxxxxxx>; David Airlie <airlied@xxxxxxxx> > Subject: RE: [PATCH] x86/gpu: add JSL stolen memory support > > Okay then I will wait for someone to respond with "Reviewed-by". So this can > be merged. > > Thanks, > Tejas > > > -----Original Message----- > > From: Bjorn Helgaas <helgaas@xxxxxxxxxx> > > Sent: 03 December 2020 20:55 > > To: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > > Cc: Surendrakumar Upadhyay, TejaskumarX > > <tejaskumarx.surendrakumar.upadhyay@xxxxxxxxx>; Jesse Barnes > > <jsbarnes@xxxxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; Linux PCI > > <linux- pci@xxxxxxxxxxxxxxx>; Linux Kernel Mailing List <linux- > > kernel@xxxxxxxxxxxxxxx>; X86 ML <x86@xxxxxxxxxx>; Borislav Petkov > > <bp@xxxxxxxxx>; De Marchi, Lucas <lucas.demarchi@xxxxxxxxx>; Roper, > > Matthew D <matthew.d.roper@xxxxxxxxx>; Pandey, Hariom > > <hariom.pandey@xxxxxxxxx>; Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>; > > Vivi, Rodrigo <rodrigo.vivi@xxxxxxxxx>; David Airlie > > <airlied@xxxxxxxx> > > Subject: Re: [PATCH] x86/gpu: add JSL stolen memory support > > > > On Thu, Dec 03, 2020 at 10:46:29AM +0200, Joonas Lahtinen wrote: > > > Quoting Bjorn Helgaas (2020-12-02 22:22:53) > > > > On Wed, Dec 02, 2020 at 05:21:58AM +0000, Surendrakumar Upadhyay, > > TejaskumarX wrote: > > > > > Yes it fails all the tests which are allocating from this stolen > > > > > memory bunch. For example IGT tests like " > > > > > igt@kms_frontbuffer_tracking@-[fbc|fbcpsr].* | > > > > > igt@kms_fbcon_fbt@fbc.* " are failing as they totally depend to > > > > > work on stolen memory. > > > > > > That's just because we have de-duped the stolen memory detection code. > > > If it's not detected at the early quirks, it's not detected by the > > > driver at all. > > > > > > So if the patch is not merged to early quirks, we'd have to refactor > > > the code to add alternative detection path to i915. Before that is > > > done, the failures are expected. > > > > > > > I'm sure that means something to graphics developers, but I have > > > > no idea! Do you have URLs for the test case source, outputs, > > > > dmesg log, lspci info, bug reports, etc? > > > > > > The thing is, the bug reports for stuff like this would only start > > > to flow after Jasperlake systems are shipping widely and the less > > > common OEMs start integrating it to into strangely behaving BIOSes. > > > Or that is the assumption. > > > > > > If it's fine to merge this through i915 for now with an Acked-by, > > > like the previous patches, that'd be great. We can start a > > > discussion on if the new platforms are affected anymore. But I'd > > > rather not drop it before we have that understanding, as the > > > previous problems have included boot time memory corruption. > > > > > > Would that work? > > > > Like I said, I'm not objecting if somebody else wants to apply this. > > > > I'm just pointing out that there's a little bit of voodoo here because > > it's not clear what makes a BIOS strangely behaving or what causes > > boot-time memory corruption, and that means we don't really have any > > hope of resolving this stream of quirk updates. > > > > Bjorn
