diff mbox

[02/13] drm/i915: reference count for i915_hw_contexts

Message ID 1361876716-8625-3-git-send-email-mika.kuoppala@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Mika Kuoppala Feb. 26, 2013, 11:05 a.m. UTC 
In preparation to do analysis of which context was
guilty of gpu hung, store kreffed context pointer
into request struct.

This allows us to inspect contexts when gpu is reset
even if those contexts would already be released
by userspace.

v2: track i915_hw_context pointers instead of using ctx_ids
    (from Chris Wilson)

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h            |    8 +++++++-
 drivers/gpu/drm/i915/i915_gem.c            |   20 +++++++++++++++++---
 drivers/gpu/drm/i915/i915_gem_context.c    |   22 ++++++++++++++++++----
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |   10 ++++++----
 drivers/gpu/drm/i915/intel_overlay.c       |    4 ++--
 drivers/gpu/drm/i915/intel_ringbuffer.c    |    2 +-
 6 files changed, 51 insertions(+), 15 deletions(-)

Comments

Ben Widawsky Feb. 26, 2013, 9:45 p.m. UTC | #1 
On Tue, Feb 26, 2013 at 01:05:05PM +0200, Mika Kuoppala wrote:
> In preparation to do analysis of which context was
> guilty of gpu hung, store kreffed context pointer
> into request struct.
> 
> This allows us to inspect contexts when gpu is reset
> even if those contexts would already be released
> by userspace.
> 
> v2: track i915_hw_context pointers instead of using ctx_ids
>     (from Chris Wilson)
> 

Daniel: it's like if we just stored a bit of context info in the object,
we wouldn't need to refcount... hmm

[snip]
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 27459ec..9f1a75d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -437,6 +437,7 @@  struct i915_hw_ppgtt {
 /* This must match up with the value previously used for execbuf2.rsvd1. */
 #define DEFAULT_CONTEXT_ID 0
 struct i915_hw_context {
+	struct kref ref;
 	int id;
 	bool is_initialized;
 	struct drm_i915_file_private *file_priv;
@@ -1240,6 +1241,9 @@  struct drm_i915_gem_request {
 	/** Postion in the ringbuffer of the end of the request */
 	u32 tail;
 
+	/** Context related to this request */
+	struct i915_hw_context *ctx;
+
 	/** Time at which this request was emitted, in jiffies. */
 	unsigned long emitted_jiffies;
 
@@ -1629,7 +1633,8 @@  int __must_check i915_gpu_idle(struct drm_device *dev);
 int __must_check i915_gem_idle(struct drm_device *dev);
 int i915_add_request(struct intel_ring_buffer *ring,
 		     struct drm_file *file,
-		     u32 *seqno);
+		     u32 *seqno,
+		     struct i915_hw_context *ctx);
 int __must_check i915_wait_seqno(struct intel_ring_buffer *ring,
 				 uint32_t seqno);
 int i915_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
@@ -1673,6 +1678,7 @@  void i915_gem_context_close(struct drm_device *dev, struct drm_file *file);
 int i915_switch_context(struct intel_ring_buffer *ring,
 			struct drm_file *file, int to_id,
 			struct i915_hw_context **ctx);
+void i915_gem_context_free(struct kref *ctx_ref);
 int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 				  struct drm_file *file);
 int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 61610f3..850b1bb 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -967,7 +967,7 @@  i915_gem_check_olr(struct intel_ring_buffer *ring, u32 seqno)
 
 	ret = 0;
 	if (seqno == ring->outstanding_lazy_request)
-		ret = i915_add_request(ring, NULL, NULL);
+		ret = i915_add_request(ring, NULL, NULL, NULL);
 
 	return ret;
 }
@@ -1997,7 +1997,8 @@  i915_gem_get_seqno(struct drm_device *dev, u32 *seqno)
 int
 i915_add_request(struct intel_ring_buffer *ring,
 		 struct drm_file *file,
-		 u32 *out_seqno)
+		 u32 *out_seqno,
+		 struct i915_hw_context *ctx)
 {
 	drm_i915_private_t *dev_priv = ring->dev->dev_private;
 	struct drm_i915_gem_request *request;
@@ -2037,6 +2038,11 @@  i915_add_request(struct intel_ring_buffer *ring,
 	request->seqno = intel_ring_get_seqno(ring);
 	request->ring = ring;
 	request->tail = request_ring_position;
+	request->ctx = ctx;
+
+	if (request->ctx)
+		kref_get(&request->ctx->ref);
+
 	request->emitted_jiffies = jiffies;
 	was_empty = list_empty(&ring->request_list);
 	list_add_tail(&request->list, &ring->request_list);
@@ -2101,6 +2107,10 @@  static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
 
 		list_del(&request->list);
 		i915_gem_request_remove_from_client(request);
+
+		if (request->ctx)
+			kref_put(&request->ctx->ref, i915_gem_context_free);
+
 		kfree(request);
 	}
 
@@ -2195,6 +2205,10 @@  i915_gem_retire_requests_ring(struct intel_ring_buffer *ring)
 
 		list_del(&request->list);
 		i915_gem_request_remove_from_client(request);
+
+		if (request->ctx)
+			kref_put(&request->ctx->ref, i915_gem_context_free);
+
 		kfree(request);
 	}
 
@@ -2262,7 +2276,7 @@  i915_gem_retire_work_handler(struct work_struct *work)
 	idle = true;
 	for_each_ring(ring, dev_priv, i) {
 		if (ring->gpu_caches_dirty)
-			i915_add_request(ring, NULL, NULL);
+			i915_add_request(ring, NULL, NULL, NULL);
 
 		idle &= list_empty(&ring->request_list);
 	}
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 4125919..cba54fb 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -124,12 +124,24 @@  static int get_context_size(struct drm_device *dev)
 	return ret;
 }
 
-static void do_destroy(struct i915_hw_context *ctx)
+void i915_gem_context_free(struct kref *ctx_ref)
+{
+	struct i915_hw_context *ctx = container_of(ctx_ref,
+						   typeof(*ctx), ref);
+	kfree(ctx);
+}
+
+static void do_release(struct i915_hw_context *ctx)
 {
 	if (ctx->file_priv)
 		idr_remove(&ctx->file_priv->context_idr, ctx->id);
 
 	drm_gem_object_unreference(&ctx->obj->base);
+}
+
+static void do_destroy(struct i915_hw_context *ctx)
+{
+	do_release(ctx);
 	kfree(ctx);
 }
 
@@ -145,6 +157,7 @@  create_hw_context(struct drm_device *dev,
 	if (ctx == NULL)
 		return ERR_PTR(-ENOMEM);
 
+	kref_init(&ctx->ref);
 	ctx->obj = i915_gem_alloc_object(dev, dev_priv->hw_context_size);
 	if (ctx->obj == NULL) {
 		kfree(ctx);
@@ -286,8 +299,8 @@  static int context_idr_cleanup(int id, void *p, void *data)
 
 	BUG_ON(id == DEFAULT_CONTEXT_ID);
 
-	do_destroy(ctx);
-
+	do_release(ctx);
+	kref_put(&ctx->ref, i915_gem_context_free);
 	return 0;
 }
 
@@ -526,7 +539,8 @@  int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
 		return -ENOENT;
 	}
 
-	do_destroy(ctx);
+	do_release(ctx);
+	kref_put(&ctx->ref, i915_gem_context_free);
 
 	mutex_unlock(&dev->struct_mutex);
 
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 499d025..b1e54d5 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -789,13 +789,14 @@  i915_gem_execbuffer_move_to_active(struct list_head *objects,
 static void
 i915_gem_execbuffer_retire_commands(struct drm_device *dev,
 				    struct drm_file *file,
-				    struct intel_ring_buffer *ring)
+				    struct intel_ring_buffer *ring,
+				    struct i915_hw_context *ctx)
 {
 	/* Unconditionally force add_request to emit a full flush. */
 	ring->gpu_caches_dirty = true;
 
 	/* Add a breadcrumb for the completion of the batch buffer */
-	(void)i915_add_request(ring, file, NULL);
+	(void)i915_add_request(ring, file, NULL, ctx);
 }
 
 static int
@@ -834,6 +835,7 @@  i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	struct drm_i915_gem_object *batch_obj;
 	struct drm_clip_rect *cliprects = NULL;
 	struct intel_ring_buffer *ring;
+	struct i915_hw_context *ctx;
 	u32 ctx_id = i915_execbuffer2_get_context_id(*args);
 	u32 exec_start, exec_len;
 	u32 mask, flags;
@@ -1017,7 +1019,7 @@  i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	if (ret)
 		goto err;
 
-	ret = i915_switch_context(ring, file, ctx_id, NULL);
+	ret = i915_switch_context(ring, file, ctx_id, &ctx);
 	if (ret)
 		goto err;
 
@@ -1068,7 +1070,7 @@  i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
 
 	i915_gem_execbuffer_move_to_active(&eb->objects, ring);
-	i915_gem_execbuffer_retire_commands(dev, file, ring);
+	i915_gem_execbuffer_retire_commands(dev, file, ring, ctx);
 
 err:
 	eb_destroy(eb);
diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c
index 67a2501..540be47 100644
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -217,7 +217,7 @@  static int intel_overlay_do_wait_request(struct intel_overlay *overlay,
 	int ret;
 
 	BUG_ON(overlay->last_flip_req);
-	ret = i915_add_request(ring, NULL, &overlay->last_flip_req);
+	ret = i915_add_request(ring, NULL, &overlay->last_flip_req, NULL);
 	if (ret)
 		return ret;
 
@@ -286,7 +286,7 @@  static int intel_overlay_continue(struct intel_overlay *overlay,
 	intel_ring_emit(ring, flip_addr);
 	intel_ring_advance(ring);
 
-	return i915_add_request(ring, NULL, &overlay->last_flip_req);
+	return i915_add_request(ring, NULL, &overlay->last_flip_req, NULL);
 }
 
 static void intel_overlay_release_old_vid_tail(struct intel_overlay *overlay)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 1d5d613..559d3e5 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1423,7 +1423,7 @@  int intel_ring_idle(struct intel_ring_buffer *ring)
 
 	/* We need to add any requests required to flush the objects and ring */
 	if (ring->outstanding_lazy_request) {
-		ret = i915_add_request(ring, NULL, NULL);
+		ret = i915_add_request(ring, NULL, NULL, NULL);
 		if (ret)
 			return ret;
 	}