[Intel-gfx] [PATCH 23/28] drm/i915: Call i915_gem_evict_vm in vm_fault_gtt to prevent new ENOSPC errors

Maarten Lankhorst
2021-10-21T10:37:02Z

Now that we cannot unbind kill the currently locked object directly
because we're removing short term pinning, we may have to unbind the
object from gtt manually, using a i915_gem_evict_vm() call.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_mman.c | 18 ++++++++++++++++--
1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index 65fc6ff5f59d..6d557bb9926f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -357,8 +357,22 @@ static vm_fault_t vm_fault_gtt(struct vm_fault *vmf)
vma = i915_gem_object_ggtt_pin_ww(obj, &ww, &view, 0, 0, flags);
}

- /* The entire mappable GGTT is pinned? Unexpected! */
- GEM_BUG_ON(vma == ERR_PTR(-ENOSPC));
+ /*
+ * The entire mappable GGTT is pinned? Unexpected!
+ * Try to evict the object we locked too, as normally we skip it
+ * due to lack of short term pinning inside execbuf.
+ */
+ if (vma == ERR_PTR(-ENOSPC)) {
+ ret = mutex_lock_interruptible(&ggtt->vm.mutex);
+ if (!ret) {
+ ret = i915_gem_evict_vm(&ggtt->vm, &ww);
+ mutex_unlock(&ggtt->vm.mutex);
+ }
+ if (ret)
+ goto err_reset;
+ vma = i915_gem_object_ggtt_pin_ww(obj, &ww, &view, 0, 0, flags);
+ }
+ GEM_WARN_ON(vma == ERR_PTR(-ENOSPC));
}
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
--
2.33.0