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drm/xe: Reject page faults from non-fault-mode scratch VMs

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Having scratch enabled does not make a VM capable of handling recoverable
page faults. Allowing scratch VMs through the ASID lookup also admits
dma-fence mode VMs.

If such a VM faults on an already valid VMA, the handler reports success
without fixing the fault, causing the GPU to retry indefinitely.

Only allow fault-mode VMs through the ASID lookup. Fault-mode VMs using
scratch remain supported, while faults from 3D VMs are rejected.

Fixes: ad9843aac9 ("drm/xe/madvise: Implement purgeable buffer object support")
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Suggested-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Arvind Yadav <arvind.yadav@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260820065445.567228-1-arvind.yadav@intel.com
This commit is contained in:
Arvind Yadav 2026-08-20 12:24:45 +05:30 committed by Matthew Brost
parent 8899e413c5
commit bfb24a0640
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/xe/xe_pagefault.c
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@ -235,7 +235,7 @@ static struct xe_vm *xe_pagefault_asid_to_vm(struct xe_device *xe, u32 asid)
down_read(&xe->usm.lock);
vm = xa_load(&xe->usm.asid_to_vm, asid);
if (vm && (xe_vm_in_fault_mode(vm) || xe_vm_has_scratch(vm)))
if (vm && xe_vm_in_fault_mode(vm))
xe_vm_get(vm);
else
vm = ERR_PTR(-EINVAL);