We do not need to hold struct_mutex for destroying drm_i915_gem_objects
any longer, and with a little care taken over tracking
obj->framebuffer_references, we can relinquish BKL locking around the
destroy of intel_framebuffer.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_object.h | 2 +-
drivers/gpu/drm/i915/i915_gem_shrinker.c | 2 +-
drivers/gpu/drm/i915/i915_gem_tiling.c | 2 +-
drivers/gpu/drm/i915/intel_display.c | 10 +++++-----
4 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_object.h
b/drivers/gpu/drm/i915/i915_gem_object.h
index 02365a5f7c80..ef4893a4f08c 100644
--- a/drivers/gpu/drm/i915/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/i915_gem_object.h
@@ -165,7 +165,7 @@ struct drm_i915_gem_object {
struct reservation_object *resv;
/** References from framebuffers, locks out tiling changes. */
- unsigned long framebuffer_references;
+ atomic_t framebuffer_references;
/** Record of address bit 17 of each page at last unbind. */
unsigned long *bit_17;
diff --git a/drivers/gpu/drm/i915/i915_gem_shrinker.c
b/drivers/gpu/drm/i915/i915_gem_shrinker.c
index f249a1eb46ac..8bc515e8b2a2 100644
--- a/drivers/gpu/drm/i915/i915_gem_shrinker.c
+++ b/drivers/gpu/drm/i915/i915_gem_shrinker.c
@@ -207,7 +207,7 @@ i915_gem_shrink(struct drm_i915_private *dev_priv,
if (!(flags & I915_SHRINK_ACTIVE) &&
(i915_gem_object_is_active(obj) ||
- obj->framebuffer_references))
+ atomic_read(&obj->framebuffer_references)))
continue;
if (!can_release_pages(obj))
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c
b/drivers/gpu/drm/i915/i915_gem_tiling.c
index 8b2b507bdf7e..46ade36dcee6 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -238,7 +238,7 @@ i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
if ((tiling | stride) == obj->tiling_and_stride)
return 0;
- if (obj->framebuffer_references)
+ if (atomic_read(&obj->framebuffer_references))
return -EBUSY;
/* We need to rebind the object if its current allocation
diff --git a/drivers/gpu/drm/i915/intel_display.c
b/drivers/gpu/drm/i915/intel_display.c
index 0d46a8db5c6f..60549508cdee 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -14266,14 +14266,14 @@ static void intel_setup_outputs(struct
drm_i915_private *dev_priv)
static void intel_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
- struct drm_device *dev = fb->dev;
struct intel_framebuffer *intel_fb = to_intel_framebuffer(fb);
drm_framebuffer_cleanup(fb);
- mutex_lock(&dev->struct_mutex);
- WARN_ON(!intel_fb->obj->framebuffer_references--);
+
+ WARN_ON(atomic_read(&intel_fb->obj->framebuffer_references) == 0);
+ atomic_dec(&intel_fb->obj->framebuffer_references);
i915_gem_object_put(intel_fb->obj);
- mutex_unlock(&dev->struct_mutex);
+
kfree(intel_fb);
}
@@ -14510,7 +14510,7 @@ static int intel_framebuffer_init(struct drm_device
*dev,
return ret;
}
- intel_fb->obj->framebuffer_references++;
+ atomic_inc(&intel_fb->obj->framebuffer_references);
return 0;
}
--
2.11.0
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