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drm/i915: Use atomics to manipulate obj->frontbuffer_bits

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The individual bits inside obj->frontbuffer_bits are protected by each
plane->mutex, but the whole bitfield may be accessed by multiple KMS
operations simultaneously and so the RMW need to be under atomics.
However, for updating the single field we do not need to mandate that it
be under the struct_mutex, one more step towards its removal as the de
facto BKL.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470324762-2545-21-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2016-08-04 16:32:37 +01:00
parent b5add9591c
commit faf5bf0ad6
6 changed files with 48 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/i915/i915_debugfs.c
+4 -2
View File
@@ -138,6 +138,7 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
struct intel_engine_cs *engine;
struct i915_vma *vma;
unsigned int frontbuffer_bits;
int pin_count = 0;
enum intel_engine_id id;
@@ -204,8 +205,9 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
if (engine)
seq_printf(m, " (%s)", engine->name);
if (obj->frontbuffer_bits)
seq_printf(m, " (frontbuffer: 0x%03x)", obj->frontbuffer_bits);
frontbuffer_bits = atomic_read(&obj->frontbuffer_bits);
if (frontbuffer_bits)
seq_printf(m, " (frontbuffer: 0x%03x)", frontbuffer_bits);
}
static int i915_gem_object_list_info(struct seq_file *m, void *data)