drm/xe: Ban a VM if rebind worker hits an error

We cannot recover a VM if a rebind worker hits an error, ban the VM if
happens to ensure we do not attempt to place this VM on the hardware
again.

A follow up will inform the user if this happens.

v2: Return -ECANCELED in exec VM closed or banned, check for closed or
banned within VM lock.
v3: Fix lockdep splat by looking engine outside of vm->lock
v4: Fix error path when engine lookup fails
v5: Add debug message in rebind worker on error, update comments wrt
locking, add xe_vm_close helper

Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/gpu/drm/xe/xe_vm.h b/drivers/gpu/drm/xe/xe_vm.h
index 5edb7771629c..02b409dd77d5 100644
--- a/drivers/gpu/drm/xe/xe_vm.h
+++ b/drivers/gpu/drm/xe/xe_vm.h
@@ -45,10 +45,21 @@ void xe_vm_unlock(struct xe_vm *vm, struct ww_acquire_ctx *ww);
 
 static inline bool xe_vm_is_closed(struct xe_vm *vm)
 {
-	/* Only guaranteed not to change when vm->resv is held */
+	/* Only guaranteed not to change when vm->lock is held */
 	return !vm->size;
 }
 
+static inline bool xe_vm_is_banned(struct xe_vm *vm)
+{
+	return vm->flags & XE_VM_FLAG_BANNED;
+}
+
+static inline bool xe_vm_is_closed_or_banned(struct xe_vm *vm)
+{
+	lockdep_assert_held(&vm->lock);
+	return xe_vm_is_closed(vm) || xe_vm_is_banned(vm);
+}
+
 struct xe_vma *
 xe_vm_find_overlapping_vma(struct xe_vm *vm, const struct xe_vma *vma);