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drm/i915: Create distinct lockclasses for execution vs user timelines 

In order to simplify the lockdep annotation, as they become more complex
in the future with deferred execution and multiple paths through the
same functions, create a separate lockclass for the user timeline and
the hardware execution timeline.

We should only ever be locking the user timeline and the execution
timeline in parallel so we only need to create two lock classes, rather
than a separate class for every timeline.

v2: Rename the lock classes to be more consistent with other lockdep.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161114204105.29171-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-11-14 20:40:57 +00:00
parent 556b748710
commit bb89485e99
4 changed files with 32 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/i915_gem.c
View File

@ -4432,9 +4432,7 @@ i915_gem_load_init(struct drm_device *dev)
mutex_lock(&dev_priv->drm.struct_mutex);
INIT_LIST_HEAD(&dev_priv->gt.timelines);
err = i915_gem_timeline_init(dev_priv,
&dev_priv->gt.global_timeline,
"[execution]");
err = i915_gem_timeline_init__global(dev_priv);
mutex_unlock(&dev_priv->drm.struct_mutex);
if (err)
goto err_requests;

2
drivers/gpu/drm/i915/i915_gem_request.c
View File

@ -346,7 +346,7 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
request->ring->vaddr + request->postfix);
engine->submit_request(request);
spin_lock_nested(&request->timeline->lock, SINGLE_DEPTH_NESTING);
spin_lock(&request->timeline->lock);
list_move_tail(&request->link, &timeline->requests);
spin_unlock(&request->timeline->lock);

33
drivers/gpu/drm/i915/i915_gem_timeline.c
View File

@ -24,9 +24,11 @@
#include "i915_drv.h"
int i915_gem_timeline_init(struct drm_i915_private *i915,
struct i915_gem_timeline *timeline,
const char *name)
static int __i915_gem_timeline_init(struct drm_i915_private *i915,
struct i915_gem_timeline *timeline,
const char *name,
struct lock_class_key *lockclass,
const char *lockname)
{
unsigned int i;
u64 fences;
@ -47,8 +49,11 @@ int i915_gem_timeline_init(struct drm_i915_private *i915,
tl->fence_context = fences++;
tl->common = timeline;
#ifdef CONFIG_DEBUG_SPINLOCK
__raw_spin_lock_init(&tl->lock.rlock, lockname, lockclass);
#else
spin_lock_init(&tl->lock);
#endif
init_request_active(&tl->last_request, NULL);
INIT_LIST_HEAD(&tl->requests);
}
@ -56,6 +61,26 @@ int i915_gem_timeline_init(struct drm_i915_private *i915,
return 0;
}
int i915_gem_timeline_init(struct drm_i915_private *i915,
struct i915_gem_timeline *timeline,
const char *name)
{
static struct lock_class_key class;
return __i915_gem_timeline_init(i915, timeline, name,
&class, "&timeline->lock");
}
int i915_gem_timeline_init__global(struct drm_i915_private *i915)
{
static struct lock_class_key class;
return __i915_gem_timeline_init(i915,
&i915->gt.global_timeline,
"[execution]",
&class, "&global_timeline->lock");
}
void i915_gem_timeline_fini(struct i915_gem_timeline *tl)
{
lockdep_assert_held(&tl->i915->drm.struct_mutex);

1
drivers/gpu/drm/i915/i915_gem_timeline.h
View File

@ -67,6 +67,7 @@ struct i915_gem_timeline {
int i915_gem_timeline_init(struct drm_i915_private *i915,
struct i915_gem_timeline *tl,
const char *name);
int i915_gem_timeline_init__global(struct drm_i915_private *i915);
void i915_gem_timeline_fini(struct i915_gem_timeline *tl);
#endif