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drm/xe: Avoid evicting object of the same vm in none fault mode

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BO validation during vm_bind could trigger memory eviction when
system runs under memory pressure. Right now we blindly evict
BOs of all VMs. This scheme has a problem when system runs in
none recoverable page fault mode: even though the vm_bind could
be successful by evicting BOs, the later the rebinding of the
evicted BOs would fail. So it is better to report an out-of-
memory failure at vm_bind time than at time of rebinding where
xekmd currently doesn't have a good mechanism to report error
to user space.

This patch implemented a scheme to only evict objects of other
VMs during vm_bind time. Object of the same VM will skip eviction.
If we failed to find enough memory for vm_bind, we report error
to user space at vm_bind time.

This scheme is not needed for recoverable page fault mode under
what we can dynamically fault-in pages on demand.

v1: Use xe_vm_in_preempt_fence_mode instead of stack variable (Thomas)

Signed-off-by: Oak Zeng <oak.zeng@intel.com>
Suggested-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241203021929.1919730-1-oak.zeng@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Oak Zeng
2024-12-02 21:19:29 -05:00
committed by Rodrigo Vivi
parent a16e1551dc
commit 774b5fa509
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/xe/xe_vm.c
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@@ -2360,13 +2360,15 @@ static int vma_lock_and_validate(struct drm_exec *exec, struct xe_vma *vma,
bool validate)
{
struct xe_bo *bo = xe_vma_bo(vma);
struct xe_vm *vm = xe_vma_vm(vma);
int err = 0;
if (bo) {
if (!bo->vm)
err = drm_exec_lock_obj(exec, &bo->ttm.base);
if (!err && validate)
err = xe_bo_validate(bo, xe_vma_vm(vma), true);
err = xe_bo_validate(bo, vm,
!xe_vm_in_preempt_fence_mode(vm));
}
return err;