[Intel-gfx] [PATCH v3 02/63] drm/i915: Add missing -EDEADLK handling to execbuf pinning

[Maarten Lankhorst]

i915_vma_pin may fail with -EDEADLK when we start locking page tables,
so ensure we handle this correctly.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 23 +++++++++++++++----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 63e2f16204da..2fbe6fbe043a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -419,13 +419,14 @@ static u64 eb_pin_flags(const struct drm_i915_gem_exec_object2 *entry,
 	return pin_flags;
 }
 
-static inline bool
+static inline int
 eb_pin_vma(struct i915_execbuffer *eb,
 	   const struct drm_i915_gem_exec_object2 *entry,
 	   struct eb_vma *ev)
 {
 	struct i915_vma *vma = ev->vma;
 	u64 pin_flags;
+	int err;
 
 	if (vma->node.size)
 		pin_flags = vma->node.start;
@@ -438,16 +439,24 @@ eb_pin_vma(struct i915_execbuffer *eb,
 
 	/* Attempt to reuse the current location if available */
 	/* TODO: Add -EDEADLK handling here */
-	if (unlikely(i915_vma_pin_ww(vma, &eb->ww, 0, 0, pin_flags))) {
+	err = i915_vma_pin_ww(vma, &eb->ww, 0, 0, pin_flags);
+	if (err == -EDEADLK)
+		return err;
+
+	if (unlikely(err)) {
 		if (entry->flags & EXEC_OBJECT_PINNED)
 			return false;
 
 		/* Failing that pick any _free_ space if suitable */
-		if (unlikely(i915_vma_pin_ww(vma, &eb->ww,
+		err = i915_vma_pin_ww(vma, &eb->ww,
 					     entry->pad_to_size,
 					     entry->alignment,
 					     eb_pin_flags(entry, ev->flags) |
-					     PIN_USER | PIN_NOEVICT)))
+					     PIN_USER | PIN_NOEVICT);
+		if (err == -EDEADLK)
+			return err;
+
+		if (unlikely(err))
 			return false;
 	}
 
@@ -896,7 +905,11 @@ static int eb_validate_vmas(struct i915_execbuffer *eb)
 		if (err)
 			return err;
 
-		if (eb_pin_vma(eb, entry, ev)) {
+		err = eb_pin_vma(eb, entry, ev);
+		if (err < 0)
+			return err;
+
+		if (err > 0) {
 			if (entry->offset != vma->node.start) {
 				entry->offset = vma->node.start | UPDATE;
 				eb->args->flags |= __EXEC_HAS_RELOC;
-- 
2.28.0