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Repeated > > > > unsuccessful responses eventually escalate to an engine memory CAT > > > > error. Because the migrate/BCS engine is shared, that CAT error > > > > wedges it for unrelated processes, which then hang on their own > > > > copies. > > > Yikes. Do you have a reproducer for this? I wouldn't expect this > > > behavior from the hardware, as it appears to violate the expected > > > process isolation contract. > > Yes, there is a reproducer, "l0-abnormal-exit-repro", in GSD-13290 on > > BMG. I have also attached the dmesg logs > > in the GSD from the drm-tip kernel, as well as from the older 7.0 > > kernel, where the issue was originally reported. > > > > Detect stale faults whose owning VM is closed or whose ASID no longer > > > > maps to a fault-capable VM, and drain them instead of replying > > > > unsuccessful. > > > > > > > > Cc: Matthew Brost > > > > Cc: Stuart Summers > > > Fixes, CC stable if this is an issue. > > sure > > > > > > > Assisted-by: GitHub Copilot:claude-opus-4.8 > > > > Signed-off-by: Sanjay Yadav > > > > --- > > > >   drivers/gpu/drm/xe/xe_pagefault.c | 22 +++++++++++++++++++--- > > > >   1 file changed, 19 insertions(+), 3 deletions(-) > > > > > > > > diff --git a/drivers/gpu/drm/xe/xe_pagefault.c > > > > b/drivers/gpu/drm/xe/xe_pagefault.c > > > > index c82b8bc8bc70..2827652ab8a3 100644 > > > > --- a/drivers/gpu/drm/xe/xe_pagefault.c > > > > +++ b/drivers/gpu/drm/xe/xe_pagefault.c > > > > @@ -238,8 +238,10 @@ static struct xe_vm > > > > *xe_pagefault_asid_to_vm(struct xe_device *xe, u32 asid) > > > >       vm = xa_load(&xe->usm.asid_to_vm, asid); > > > >       if (vm && xe_vm_in_fault_mode(vm)) > > > >           xe_vm_get(vm); > > > > -    else > > > > +    else if (vm) > > > >           vm = ERR_PTR(-EINVAL); > > > > +    else > > > > +        vm = ERR_PTR(-ENOENT); > > > >       up_read(&xe->usm.lock); > > > >         return vm; > > > > @@ -260,13 +262,27 @@ static int xe_pagefault_service(struct > > > > xe_pagefault *pf) > > > >           return -EFAULT; > > > >         vm = xe_pagefault_asid_to_vm(xe, asid); > > > > -    if (IS_ERR(vm)) > > > > +    if (IS_ERR(vm)) { > > > > +        if (PTR_ERR(vm) == -ENOENT) { > > > > +            drm_info(&xe->drm, > > > > +                 "xe_pf_debug: drain stale fault (no VM) > > > > asid=%u addr=0x%llx\n", > > > > +                 asid, pf->consumer.page_addr); > > > > +            xe_pagefault_set_start_addr(pf, pf->consumer.page_addr); > > > > +            xe_pagefault_set_end_addr(pf, pf->consumer.page_addr); > > > > +            return 0; > > > Won't the page walker hotspin on faults until the executing queue is > > > descheduled from the hardware if we successfully acknowledge them? That > > > doesn't seem ideal. > > > > > > Matt > > agree with your point > > also with this patch[with_patch-752845-fix_run.txt attached in GSD] from > > a 1.5h run (3,373 torn-down contexts) > > 95% of ASIDs re-faulted exactly once before being descheduled, 0 CAT > > errors, 0 hangs. > > So the existing async teardown already deschedules the context within a > > fault cycle or two. > > > > can I move it to teardown wait for the ASIDs queues to deregister and > > drain its pending faults > > in xe_vm_close_and_put() before erasing the ASID, but that a larger > > change. Happy to change either way. > > -Sanjay > > > Gentle ping > We have actually discussed this quite a bit, and you are not the first to complain about it. I agreed on an acceptable approach in this thread [1], particularly in this comment [2]. I haven't had enough time to implement and fully test this solution, but if you or anyone else wants to take over, my latest version [3] can be used as a starting point. The idea would be to implement [2] on top of it to serialize queue teardown before tearing down the page tables (xe_vm_close). Matt [1] https://patchwork.freedesktop.org/patch/732703/?series=168398&rev=4 [2] https://patchwork.freedesktop.org/patch/732703/?series=168398&rev=4#comment_1349875 [3] https://patchwork.freedesktop.org/patch/748380/?series=168398&rev=6 > > > > +        } > > > >           return PTR_ERR(vm); > > > > +    } > > > >         down_read(&vm->lock); > > > >         if (xe_vm_is_closed(vm)) { > > > > -        err = -ENOENT; > > > > +        drm_info(&xe->drm, > > > > +             "xe_pf_debug: drain stale fault (closed VM) > > > > asid=%u addr=0x%llx\n", > > > > +             asid, pf->consumer.page_addr); > > > > +        xe_pagefault_set_start_addr(pf, pf->consumer.page_addr); > > > > +        xe_pagefault_set_end_addr(pf, pf->consumer.page_addr); > > > > +        err = 0; > > > >           goto unlock_vm; > > > >       } > > > >   -- > > > > 2.52.0 > > > >