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drm/xe: Take ref to VM in delayed snapshot

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Kernel BO's don't take a ref to the VM, we need the VM for the
delayed snapshot, so take a ref to the VM in delayed snapshot.

v2:
 - Check for lrc_bo before taking a VM ref (CI)
 - Check lrc_bo->vm before taking / dropping a VM ref (CI)
 - Drop VM in xe_lrc_snapshot_free
v5:
 - Fix commit message wording (Johnathan)

Fixes: 47058633d9 ("drm/xe: Move lrc snapshot capturing to xe_lrc.c")
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240801154118.2547543-2-matthew.brost@intel.com
This commit is contained in:
Matthew Brost 2024-08-01 08:41:16 -07:00
parent 146458645e
commit c3bc97d2f1
1 changed files with 14 additions and 1 deletions
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15
drivers/gpu/drm/xe/xe_lrc.c
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@ -1634,6 +1634,9 @@ struct xe_lrc_snapshot *xe_lrc_snapshot_capture(struct xe_lrc *lrc)
if (!snapshot)
return NULL;
if (lrc->bo && lrc->bo->vm)
xe_vm_get(lrc->bo->vm);
snapshot->context_desc = xe_lrc_ggtt_addr(lrc);
snapshot->indirect_context_desc = xe_lrc_indirect_ring_ggtt_addr(lrc);
snapshot->head = xe_lrc_ring_head(lrc);
@ -1653,12 +1656,14 @@ struct xe_lrc_snapshot *xe_lrc_snapshot_capture(struct xe_lrc *lrc)
void xe_lrc_snapshot_capture_delayed(struct xe_lrc_snapshot *snapshot)
{
struct xe_bo *bo;
struct xe_vm *vm;
struct iosys_map src;
if (!snapshot)
return;
bo = snapshot->lrc_bo;
vm = bo->vm;
snapshot->lrc_bo = NULL;
snapshot->lrc_snapshot = kvmalloc(snapshot->lrc_size, GFP_KERNEL);
@ -1678,6 +1683,8 @@ void xe_lrc_snapshot_capture_delayed(struct xe_lrc_snapshot *snapshot)
xe_bo_unlock(bo);
put_bo:
xe_bo_put(bo);
if (vm)
xe_vm_put(vm);
}
void xe_lrc_snapshot_print(struct xe_lrc_snapshot *snapshot, struct drm_printer *p)
@ -1727,8 +1734,14 @@ void xe_lrc_snapshot_free(struct xe_lrc_snapshot *snapshot)
return;
kvfree(snapshot->lrc_snapshot);
if (snapshot->lrc_bo)
if (snapshot->lrc_bo) {
struct xe_vm *vm;
vm = snapshot->lrc_bo->vm;
xe_bo_put(snapshot->lrc_bo);
if (vm)
xe_vm_put(vm);
}
kfree(snapshot);
}