[PATCH 01/10] drm/i915: remove do_retire from i915_wait_request

Ben Widawsky
2012-04-21T01:25:03Z

This originates from a hack by me to quickly fix a bug in an earlier
patch where we needed control over whether or not waiting on a seqno
actually did any retire list processing. Since the two operations aren't
clearly related, we should pull the parameter out of the wait function,
and make the caller responsible for retiring if the action is desired.

NOTE: this patch has a functional change. I've only made the callers
which are requiring the retirement do the retirement. This move was
blasted by Keith when I tried it before in a more subtle manner; so I am
making it very clear this time around.

Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
---
drivers/gpu/drm/i915/i915_dma.c | 2 +-
drivers/gpu/drm/i915/i915_drv.h | 5 ++---
drivers/gpu/drm/i915/i915_gem.c | 33 +++++++++-------------------
drivers/gpu/drm/i915/i915_gem_evict.c | 14 ++++++++++--
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 2 +-
drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
drivers/gpu/drm/i915/intel_overlay.c | 6 ++---
drivers/gpu/drm/i915/intel_ringbuffer.c | 4 +++-
8 files changed, 32 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index a813f65..f8fdc5b 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -2198,7 +2198,7 @@ int i915_driver_unload(struct drm_device *dev)
unregister_shrinker(&dev_priv->mm.inactive_shrinker);

mutex_lock(&dev->struct_mutex);
- ret = i915_gpu_idle(dev, true);
+ ret = i915_gpu_idle(dev);
if (ret)
DRM_ERROR("failed to idle hardware: %d\n", ret);
mutex_unlock(&dev->struct_mutex);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 69e1539..a6afd83 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1291,14 +1291,13 @@ int __must_check i915_gem_init_hw(struct drm_device *dev);
void i915_gem_init_swizzling(struct drm_device *dev);
void i915_gem_init_ppgtt(struct drm_device *dev);
void i915_gem_cleanup_ringbuffer(struct drm_device *dev);
-int __must_check i915_gpu_idle(struct drm_device *dev, bool do_retire);
+int __must_check i915_gpu_idle(struct drm_device *dev);
int __must_check i915_gem_idle(struct drm_device *dev);
int __must_check i915_add_request(struct intel_ring_buffer *ring,
struct drm_file *file,
struct drm_i915_gem_request *request);
int __must_check i915_wait_request(struct intel_ring_buffer *ring,
- uint32_t seqno,
- bool do_retire);
+ uint32_t seqno);
int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
int __must_check
i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 7bc4a40..3008cba 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1853,8 +1853,7 @@ i915_gem_retire_work_handler(struct work_struct *work)
*/
int
i915_wait_request(struct intel_ring_buffer *ring,
- uint32_t seqno,
- bool do_retire)
+ uint32_t seqno)
{
drm_i915_private_t *dev_priv = ring->dev->dev_private;
u32 ier;
@@ -1930,14 +1929,6 @@ i915_wait_request(struct intel_ring_buffer *ring,
if (atomic_read(&dev_priv->mm.wedged))
ret = -EAGAIN;

- /* Directly dispatch request retiring. While we have the work queue
- * to handle this, the waiter on a request often wants an associated
- * buffer to have made it to the inactive list, and we would need
- * a separate wait queue to handle that.
- */
- if (ret == 0 && do_retire)
- i915_gem_retire_requests_ring(ring);
-
return ret;
}

@@ -1959,10 +1950,10 @@ i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj)
* it.
*/
if (obj->active) {
- ret = i915_wait_request(obj->ring, obj->last_rendering_seqno,
- true);
+ ret = i915_wait_request(obj->ring, obj->last_rendering_seqno);
if (ret)
return ret;
+ i915_gem_retire_requests_ring(obj->ring);
}

return 0;
@@ -2145,7 +2136,7 @@ i915_gem_flush_ring(struct intel_ring_buffer *ring,
return 0;
}

-static int i915_ring_idle(struct intel_ring_buffer *ring, bool do_retire)
+static int i915_ring_idle(struct intel_ring_buffer *ring)
{
int ret;

@@ -2159,18 +2150,17 @@ static int i915_ring_idle(struct intel_ring_buffer *ring, bool do_retire)
return ret;
}

- return i915_wait_request(ring, i915_gem_next_request_seqno(ring),
- do_retire);
+ return i915_wait_request(ring, i915_gem_next_request_seqno(ring));
}

-int i915_gpu_idle(struct drm_device *dev, bool do_retire)
+int i915_gpu_idle(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
int ret, i;

/* Flush everything onto the inactive list. */
for (i = 0; i < I915_NUM_RINGS; i++) {
- ret = i915_ring_idle(&dev_priv->ring[i], do_retire);
+ ret = i915_ring_idle(&dev_priv->ring[i]);
if (ret)
return ret;
}
@@ -2359,12 +2349,9 @@ i915_gem_object_flush_fence(struct drm_i915_gem_object *obj)
}

if (obj->last_fenced_seqno) {
- ret = i915_wait_request(obj->ring,
- obj->last_fenced_seqno,
- false);
+ ret = i915_wait_request(obj->ring, obj->last_fenced_seqno);
if (ret)
return ret;
-
obj->last_fenced_seqno = 0;
}

@@ -3440,7 +3427,7 @@ i915_gem_idle(struct drm_device *dev)
return 0;
}

- ret = i915_gpu_idle(dev, true);
+ ret = i915_gpu_idle(dev);
if (ret) {
mutex_unlock(&dev->struct_mutex);
return ret;
@@ -4018,7 +4005,7 @@ rescan:
* This has a dramatic impact to reduce the number of
* OOM-killer events whilst running the GPU aggressively.
*/
- if (i915_gpu_idle(dev, true) == 0)
+ if (i915_gpu_idle(dev) == 0)
goto rescan;
}
mutex_unlock(&dev->struct_mutex);
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 21a8271..df9354c 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -168,6 +168,7 @@ i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)
drm_i915_private_t *dev_priv = dev->dev_private;
int ret;
bool lists_empty;
+ int i;

lists_empty = (list_empty(&dev_priv->mm.inactive_list) &&
list_empty(&dev_priv->mm.flushing_list) &&
@@ -177,11 +178,20 @@ i915_gem_evict_everything(struct drm_device *dev, bool purgeable_only)

trace_i915_gem_evict_everything(dev, purgeable_only);

- /* Flush everything (on to the inactive lists) and evict */
- ret = i915_gpu_idle(dev, true);
+ ret = i915_gpu_idle(dev);
if (ret)
return ret;

+ /* The gpu_idle will flush everything in the write domain to the
+ * active list. Then we must move everything off the active list
+ * with retire requests.
+ */
+ for (i = 0; i < I915_NUM_RINGS; i++)
+ if (WARN_ON(!list_empty(&dev_priv->ring[i].gpu_write_list)))
+ return -EBUSY;
+
+ i915_gem_retire_requests(dev);
+
BUG_ON(!list_empty(&dev_priv->mm.flushing_list));

return i915_gem_evict_inactive(dev, purgeable_only);
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 68ec013..582f6c4 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1220,7 +1220,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
* so every billion or so execbuffers, we need to stall
* the GPU in order to reset the counters.
*/
- ret = i915_gpu_idle(dev, true);
+ ret = i915_gpu_idle(dev);
if (ret)
goto err;

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 25c8bf9..29d573c 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -317,7 +317,7 @@ static bool do_idling(struct drm_i915_private *dev_priv)

if (unlikely(dev_priv->mm.gtt->do_idle_maps)) {
dev_priv->mm.interruptible = false;
- if (i915_gpu_idle(dev_priv->dev, false)) {
+ if (i915_gpu_idle(dev_priv->dev)) {
DRM_ERROR("Couldn't idle GPU\n");
/* Wait a bit, in hopes it avoids the hang */
udelay(10);
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index 80b331c..5ade12e 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -225,8 +225,7 @@ static int intel_overlay_do_wait_request(struct intel_overlay *overlay,
}
overlay->last_flip_req = request->seqno;
overlay->flip_tail = tail;
- ret = i915_wait_request(LP_RING(dev_priv), overlay->last_flip_req,
- true);
+ ret = i915_wait_request(LP_RING(dev_priv), overlay->last_flip_req);
if (ret)
return ret;

@@ -447,8 +446,7 @@ static int intel_overlay_recover_from_interrupt(struct intel_overlay *overlay)
if (overlay->last_flip_req == 0)
return 0;

- ret = i915_wait_request(LP_RING(dev_priv), overlay->last_flip_req,
- true);
+ ret = i915_wait_request(LP_RING(dev_priv), overlay->last_flip_req);
if (ret)
return ret;

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 12d9bc7..13eaf6a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1049,9 +1049,11 @@ static int intel_ring_wait_seqno(struct intel_ring_buffer *ring, u32 seqno)
was_interruptible = dev_priv->mm.interruptible;
dev_priv->mm.interruptible = false;

- ret = i915_wait_request(ring, seqno, true);
+ ret = i915_wait_request(ring, seqno);

dev_priv->mm.interruptible = was_interruptible;
+ if (!ret)
+ i915_gem_retire_requests_ring(ring);

return ret;
}
--
1.7.10