From: John Harrison <John.C.Harrison@xxxxxxxxx>
The request structure is reference counted. When the count reached
zero, the request was immediately freed and all associated objects
were unrefereced/unallocated. This meant that the driver mutex lock
must be held at the point where the count reaches zero. This was fine
while all references were held internally to the driver. However, the
plan is to allow the underlying fence object (and hence the request
itself) to be returned to other drivers and to userland. External
users cannot be expected to acquire a driver private mutex lock.
Rather than attempt to disentangle the request structure from the
driver mutex lock, the decsion was to defer the free code until a
later (safer) point. Hence this patch changes the unreference callback
to merely move the request onto a delayed free list. The driver's
retire worker thread will then process the list and actually call the
free function on the requests.
v2: New patch in series.
v3: Updated after review comments by Tvrtko Ursulin. Rename list nodes
to 'link' rather than 'list'. Update list processing to be more
efficient/safer with respect to spinlocks.
v4: Changed to use basic spinlocks rather than IRQ ones - missed
update from earlier feedback by Tvrtko.
v5: Improved a comment to keep the style checker happy.
For: VIZ-5190
Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 22 +++-----------------
drivers/gpu/drm/i915/i915_gem.c | 37 +++++++++++++++++++++++++++++----
drivers/gpu/drm/i915/intel_display.c | 2 +-
drivers/gpu/drm/i915/intel_lrc.c | 2 ++
drivers/gpu/drm/i915/intel_pm.c | 2 +-
drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
drivers/gpu/drm/i915/intel_ringbuffer.h | 7 +++++++
7 files changed, 49 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 62dbdf2..2c6aefba 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2208,14 +2208,9 @@ void i915_gem_track_fb(struct drm_i915_gem_object *old,
* initial reference taken using kref_init
*/
struct drm_i915_gem_request {
- /**
- * Underlying object for implementing the signal/wait stuff.
- * NB: Never return this fence object to user land! It is unsafe to
- * let anything outside of the i915 driver get hold of the fence
- * object as the clean up when decrementing the reference count
- * requires holding the driver mutex lock.
- */
+ /** Underlying object for implementing the signal/wait stuff. */
struct fence fence;
+ struct list_head delayed_free_link;
/** On Which ring this request was generated */
struct drm_i915_private *i915;
@@ -2337,21 +2332,10 @@ i915_gem_request_reference(struct drm_i915_gem_request *req)
static inline void
i915_gem_request_unreference(struct drm_i915_gem_request *req)
{
- WARN_ON(!mutex_is_locked(&req->ring->dev->struct_mutex));
- fence_put(&req->fence);
-}
-
-static inline void
-i915_gem_request_unreference__unlocked(struct drm_i915_gem_request *req)
-{
- struct drm_device *dev;
-
if (!req)
return;
- dev = req->ring->dev;
- if (kref_put_mutex(&req->fence.refcount, fence_release, &dev->struct_mutex))
- mutex_unlock(&dev->struct_mutex);
+ fence_put(&req->fence);
}
static inline void i915_gem_request_assign(struct drm_i915_gem_request **pdst,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 2d50287..aca9fcd 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2683,10 +2683,26 @@ static void i915_set_reset_status(struct drm_i915_private *dev_priv,
}
}
-static void i915_gem_request_free(struct fence *req_fence)
+static void i915_gem_request_release(struct fence *req_fence)
{
struct drm_i915_gem_request *req = container_of(req_fence,
typeof(*req), fence);
+ struct intel_engine_cs *ring = req->ring;
+ struct drm_i915_private *dev_priv = to_i915(ring->dev);
+
+ /*
+ * Need to add the request to a deferred dereference list to be
+ * processed at a mutex lock safe time.
+ */
+ spin_lock(&ring->delayed_free_lock);
+ list_add_tail(&req->delayed_free_link, &ring->delayed_free_list);
+ spin_unlock(&ring->delayed_free_lock);
+
+ queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
+}
+
+static void i915_gem_request_free(struct drm_i915_gem_request *req)
+{
struct intel_context *ctx = req->ctx;
WARN_ON(!mutex_is_locked(&req->ring->dev->struct_mutex));
@@ -2766,7 +2782,7 @@ static const struct fence_ops i915_gem_request_fops = {
.enable_signaling = i915_gem_request_enable_signaling,
.signaled = i915_gem_request_is_completed,
.wait = fence_default_wait,
- .release = i915_gem_request_free,
+ .release = i915_gem_request_release,
.get_driver_name = i915_gem_request_get_driver_name,
.get_timeline_name = i915_gem_request_get_timeline_name,
.fence_value_str = i915_gem_request_fence_value_str,
@@ -3014,6 +3030,9 @@ void i915_gem_reset(struct drm_device *dev)
void
i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
{
+ struct drm_i915_gem_request *req, *req_next;
+ LIST_HEAD(list_head);
+
WARN_ON(i915_verify_lists(ring->dev));
/* Retire requests first as we use it above for the early return.
@@ -3057,6 +3076,15 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *ring)
i915_gem_request_assign(&ring->trace_irq_req, NULL);
}
+ /* Really free any requests that were recently unreferenced */
+ spin_lock(&ring->delayed_free_lock);
+ list_splice_init(&ring->delayed_free_list, &list_head);
+ spin_unlock(&ring->delayed_free_lock);
+ list_for_each_entry_safe(req, req_next, &list_head, delayed_free_link) {
+ list_del(&req->delayed_free_link);
+ i915_gem_request_free(req);
+ }
+
WARN_ON(i915_verify_lists(ring->dev));
}
@@ -3251,7 +3279,7 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
ret = __i915_wait_request(req[i], reset_counter, true,
args->timeout_ns > 0 ? &args->timeout_ns : NULL,
to_rps_client(file));
- i915_gem_request_unreference__unlocked(req[i]);
+ i915_gem_request_unreference(req[i]);
}
return ret;
@@ -4266,7 +4294,7 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
if (ret == 0)
queue_delayed_work(dev_priv->wq, &dev_priv->mm.retire_work, 0);
- i915_gem_request_unreference__unlocked(target);
+ i915_gem_request_unreference(target);
return ret;
}
@@ -5123,6 +5151,7 @@ init_ring_lists(struct intel_engine_cs *ring)
{
INIT_LIST_HEAD(&ring->active_list);
INIT_LIST_HEAD(&ring->request_list);
+ INIT_LIST_HEAD(&ring->delayed_free_list);
}
void
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a7bcd87e..6e12ed7 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11456,7 +11456,7 @@ static void intel_mmio_flip_work_func(struct work_struct *work)
mmio_flip->crtc->reset_counter,
false, NULL,
&mmio_flip->i915->rps.mmioflips));
- i915_gem_request_unreference__unlocked(mmio_flip->req);
+ i915_gem_request_unreference(mmio_flip->req);
}
/* For framebuffer backed by dmabuf, wait for fence */
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index ac1f6dc..fede0dd 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -2013,7 +2013,9 @@ logical_ring_init(struct drm_device *dev, struct intel_engine_cs *ring)
ring->dev = dev;
INIT_LIST_HEAD(&ring->active_list);
INIT_LIST_HEAD(&ring->request_list);
+ INIT_LIST_HEAD(&ring->delayed_free_list);
spin_lock_init(&ring->fence_lock);
+ spin_lock_init(&ring->delayed_free_lock);
i915_gem_batch_pool_init(dev, &ring->batch_pool);
init_waitqueue_head(&ring->irq_queue);
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 061c59d..18c01b6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -7310,7 +7310,7 @@ static void __intel_rps_boost_work(struct work_struct *work)
gen6_rps_boost(to_i915(req->ring->dev), NULL,
req->emitted_jiffies);
- i915_gem_request_unreference__unlocked(req);
+ i915_gem_request_unreference(req);
kfree(boost);
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 651b700..ea2235f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2159,7 +2159,9 @@ static int intel_init_ring_buffer(struct drm_device *dev,
INIT_LIST_HEAD(&ring->request_list);
INIT_LIST_HEAD(&ring->execlist_queue);
INIT_LIST_HEAD(&ring->buffers);
+ INIT_LIST_HEAD(&ring->delayed_free_list);
spin_lock_init(&ring->fence_lock);
+ spin_lock_init(&ring->delayed_free_lock);
i915_gem_batch_pool_init(dev, &ring->batch_pool);
memset(ring->semaphore.sync_seqno, 0, sizeof(ring->semaphore.sync_seqno));
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 585a540..a43247f 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -305,6 +305,13 @@ struct intel_engine_cs {
*/
u32 last_submitted_seqno;
+ /*
+ * Deferred free list to allow unreferencing requests from interrupt
+ * contexts and from outside of the i915 driver.
+ */
+ struct list_head delayed_free_list;
+ spinlock_t delayed_free_lock;
+
bool gpu_caches_dirty;
wait_queue_head_t irq_queue;
--
1.9.1
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
