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drm/i915: Hold reference to intel_frontbuffer as we track activity

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Since obj->frontbuffer is no longer protected by the struct_mutex, as we
are processing the execbuf, it may be removed. Mark the
intel_frontbuffer as rcu protected, and so acquire a reference to
the struct as we track activity upon it.

Closes: https://gitlab.freedesktop.org/drm/intel/issues/827
Fixes: 8e7cb1799b ("drm/i915: Extract intel_frontbuffer active tracking")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: <stable@vger.kernel.org> # v5.4+
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191218104043.3539458-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2019-12-18 10:40:43 +00:00
parent edb1ecad77
commit da42104f58
11 changed files with 116 additions and 31 deletions
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10
drivers/gpu/drm/i915/i915_gem.c
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@@ -200,7 +200,7 @@ i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
* We manually control the domain here and pretend that it
* remains coherent i.e. in the GTT domain, like shmem_pwrite.
*/
intel_frontbuffer_invalidate(obj->frontbuffer, ORIGIN_CPU);
i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
if (copy_from_user(vaddr, user_data, args->size))
return -EFAULT;
@@ -208,7 +208,7 @@ i915_gem_phys_pwrite(struct drm_i915_gem_object *obj,
drm_clflush_virt_range(vaddr, args->size);
intel_gt_chipset_flush(&to_i915(obj->base.dev)->gt);
intel_frontbuffer_flush(obj->frontbuffer, ORIGIN_CPU);
i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
return 0;
}
@@ -628,7 +628,7 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
goto out_unpin;
}
intel_frontbuffer_invalidate(obj->frontbuffer, ORIGIN_CPU);
i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
user_data = u64_to_user_ptr(args->data_ptr);
offset = args->offset;
@@ -672,7 +672,7 @@ i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj,
}
intel_gt_flush_ggtt_writes(ggtt->vm.gt);
intel_frontbuffer_flush(obj->frontbuffer, ORIGIN_CPU);
i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
i915_gem_object_unlock_fence(obj, fence);
out_unpin:
@@ -761,7 +761,7 @@ i915_gem_shmem_pwrite(struct drm_i915_gem_object *obj,
offset = 0;
}
intel_frontbuffer_flush(obj->frontbuffer, ORIGIN_CPU);
i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
i915_gem_object_unlock_fence(obj, fence);
return ret;