[Intel-gfx] [PATCH 02/61] 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.lankho...@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

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