On 02/11/2016 17:50, Chris Wilson wrote:
The execlist_lock is now completely subsumed by the engine->timeline->lock,
and so we can remove the redundant layer of locking.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_debugfs.c | 4 ++--
drivers/gpu/drm/i915/i915_gem.c | 4 ++--
drivers/gpu/drm/i915/intel_engine_cs.c | 1 -
drivers/gpu/drm/i915/intel_lrc.c | 7 +------
drivers/gpu/drm/i915/intel_ringbuffer.h | 1 -
5 files changed, 5 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index c9465fbff2df..3cb96d260dfb 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3256,11 +3256,11 @@ static int i915_engine_info(struct seq_file *m, void
*unused)
seq_printf(m, "\t\tELSP[1] idle\n");
rcu_read_unlock();
- spin_lock_irq(&engine->execlist_lock);
Hm why did we have this as _irq and not _bh already?
+ spin_lock_irq(&engine->timeline->lock);
list_for_each_entry(rq, &engine->execlist_queue,
execlist_link) {
print_request(m, rq, "\t\tQ ");
}
- spin_unlock_irq(&engine->execlist_lock);
+ spin_unlock_irq(&engine->timeline->lock);
} else if (INTEL_GEN(dev_priv) > 6) {
seq_printf(m, "\tPP_DIR_BASE: 0x%08x\n",
I915_READ(RING_PP_DIR_BASE(engine)));
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5839bebba64a..cf28666021f8 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2686,12 +2686,12 @@ static void i915_gem_cleanup_engine(struct
intel_engine_cs *engine)
*/
if (i915.enable_execlists) {
- spin_lock(&engine->execlist_lock);
Likewise should have been _bh here, never mind now. :)
+ spin_lock_irq(&engine->timeline->lock);
INIT_LIST_HEAD(&engine->execlist_queue);
i915_gem_request_put(engine->execlist_port[0].request);
i915_gem_request_put(engine->execlist_port[1].request);
memset(engine->execlist_port, 0, sizeof(engine->execlist_port));
- spin_unlock(&engine->execlist_lock);
+ spin_unlock_irq(&engine->timeline->lock);
}
}
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c
b/drivers/gpu/drm/i915/intel_engine_cs.c
index 841f8d1e1410..298f0f95dd3f 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -237,7 +237,6 @@ static void intel_engine_init_timeline(struct
intel_engine_cs *engine)
void intel_engine_setup_common(struct intel_engine_cs *engine)
{
INIT_LIST_HEAD(&engine->execlist_queue);
- spin_lock_init(&engine->execlist_lock);
intel_engine_init_timeline(engine);
intel_engine_init_hangcheck(engine);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index b9aba16851ac..186c3ccb2c34 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -471,7 +471,6 @@ static void execlists_dequeue(struct intel_engine_cs
*engine)
*/
spin_lock_irqsave(&engine->timeline->lock, flags);
- spin_lock(&engine->execlist_lock);
list_for_each_entry(cursor, &engine->execlist_queue, execlist_link) {
/* Can we combine this request with the current port? It has to
* be the same context/ringbuffer and not have any exceptions
@@ -515,7 +514,6 @@ static void execlists_dequeue(struct intel_engine_cs
*engine)
i915_gem_request_assign(&port->request, last);
}
- spin_unlock(&engine->execlist_lock);
spin_unlock_irqrestore(&engine->timeline->lock, flags);
if (submit)
@@ -600,9 +598,8 @@ static void intel_lrc_irq_handler(unsigned long data)
static void execlists_submit_request(struct drm_i915_gem_request *request)
{
struct intel_engine_cs *engine = request->engine;
- unsigned long flags;
- spin_lock_irqsave(&engine->execlist_lock, flags);
Again I am confused why this wasn't just _bh.
+ assert_spin_locked(&engine->timeline->lock);
/* We keep the previous context alive until we retire the following
* request. This ensures that any the context object is still pinned
@@ -616,8 +613,6 @@ static void execlists_submit_request(struct
drm_i915_gem_request *request)
list_add_tail(&request->execlist_link, &engine->execlist_queue);
if (execlists_elsp_idle(engine))
tasklet_hi_schedule(&engine->irq_tasklet);
-
- spin_unlock_irqrestore(&engine->execlist_lock, flags);
}
int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request
*request)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h
b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 642b54692d0d..062bc8e1872a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -335,7 +335,6 @@ struct intel_engine_cs {
/* Execlists */
struct tasklet_struct irq_tasklet;
- spinlock_t execlist_lock; /* used inside tasklet, use spin_lock_bh */
struct execlist_port {
struct drm_i915_gem_request *request;
unsigned int count;
Anyway, looks correct.
Reviewed-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Regards,
Tvrtko
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