On 1/13/22 12:44, Maarten Lankhorst wrote:
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.
Changes since v1:
- Remove -ENOSPC warning, can still happen with concurrent mmaps
where we can't unbind the other mmap because of the lock held.
This fixes the gem_mmap_gtt@cpuset tests.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
Reviewed-by: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
---
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 5ac2506f4ee8..fafd158e5313 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -21,6 +21,7 @@
#include "i915_trace.h"
#include "i915_user_extensions.h"
#include "i915_gem_ttm.h"
+#include "i915_gem_evict.h"
#include "i915_vma.h"
static inline bool
@@ -358,8 +359,21 @@ 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);
+ mutex_unlock(&ggtt->vm.mutex);
+ }
+ if (ret)
+ goto err_reset;
+ vma = i915_gem_object_ggtt_pin_ww(obj, &ww, &view, 0, 0, flags);
+ }
}
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
