[Intel-gfx] [PATCH] Revert "drm/i915: Extend LRC pinning to cover GPU context writeback"
Daniel Vetter
daniel.vetter at ffwll.ch
Fri Dec 4 08:30:20 PST 2015
This reverts commit 6d65ba943a2d1e4292a07ca7ddb6c5138b9efa5d.
Mika Kuoppala traced down a use-after-free crash in module unload to
this commit, because ring->last_context is leaked beyond when the
context gets destroyed. Mika submitted a quick fix to patch that up in
the context destruction code, but that's too much of a hack.
The right fix is instead for the ring to hold a full reference onto
it's last context, like we do for legacy contexts.
Since this is causing a regression in BAT it gets reverted before we
can close this.
Cc: Nick Hoath <nicholas.hoath at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: David Gordon <david.s.gordon at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Alex Dai <yu.dai at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 -
drivers/gpu/drm/i915/i915_gem.c | 7 +-
drivers/gpu/drm/i915/intel_lrc.c | 136 +++++++--------------------------------
drivers/gpu/drm/i915/intel_lrc.h | 1 -
4 files changed, 27 insertions(+), 118 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f95f36767649..5e276f5d61da 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -884,7 +884,6 @@ struct intel_context {
struct {
struct drm_i915_gem_object *state;
struct intel_ringbuffer *ringbuf;
- bool dirty;
int pin_count;
} engine[I915_NUM_RINGS];
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index ef4dbe3d442d..a531cb83295c 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1354,9 +1354,6 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request)
{
trace_i915_gem_request_retire(request);
- if (i915.enable_execlists)
- intel_lr_context_complete_check(request);
-
/* We know the GPU must have read the request to have
* sent us the seqno + interrupt, so use the position
* of tail of the request to update the last known position
@@ -2767,6 +2764,10 @@ static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
struct drm_i915_gem_request,
execlist_link);
list_del(&submit_req->execlist_link);
+
+ if (submit_req->ctx != ring->default_context)
+ intel_lr_context_unpin(submit_req);
+
i915_gem_request_unreference(submit_req);
}
spin_unlock_irq(&ring->execlist_lock);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index c3504a09340c..4ebafab53f30 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -571,6 +571,9 @@ static int execlists_context_queue(struct drm_i915_gem_request *request)
struct drm_i915_gem_request *cursor;
int num_elements = 0;
+ if (request->ctx != ring->default_context)
+ intel_lr_context_pin(request);
+
i915_gem_request_reference(request);
spin_lock_irq(&ring->execlist_lock);
@@ -734,13 +737,6 @@ intel_logical_ring_advance_and_submit(struct drm_i915_gem_request *request)
if (intel_ring_stopped(ring))
return;
- if (request->ctx != ring->default_context) {
- if (!request->ctx->engine[ring->id].dirty) {
- intel_lr_context_pin(request);
- request->ctx->engine[ring->id].dirty = true;
- }
- }
-
if (dev_priv->guc.execbuf_client)
i915_guc_submit(dev_priv->guc.execbuf_client, request);
else
@@ -967,6 +963,12 @@ void intel_execlists_retire_requests(struct intel_engine_cs *ring)
spin_unlock_irq(&ring->execlist_lock);
list_for_each_entry_safe(req, tmp, &retired_list, execlist_link) {
+ struct intel_context *ctx = req->ctx;
+ struct drm_i915_gem_object *ctx_obj =
+ ctx->engine[ring->id].state;
+
+ if (ctx_obj && (ctx != ring->default_context))
+ intel_lr_context_unpin(req);
list_del(&req->execlist_link);
i915_gem_request_unreference(req);
}
@@ -1061,39 +1063,21 @@ reset_pin_count:
return ret;
}
-static void __intel_lr_context_unpin(struct intel_engine_cs *ring,
- struct intel_context *ctx)
+void intel_lr_context_unpin(struct drm_i915_gem_request *rq)
{
- struct drm_i915_gem_object *ctx_obj = ctx->engine[ring->id].state;
- struct intel_ringbuffer *ringbuf = ctx->engine[ring->id].ringbuf;
+ struct intel_engine_cs *ring = rq->ring;
+ struct drm_i915_gem_object *ctx_obj = rq->ctx->engine[ring->id].state;
+ struct intel_ringbuffer *ringbuf = rq->ringbuf;
+
if (ctx_obj) {
WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
- if (--ctx->engine[ring->id].pin_count == 0) {
+ if (--rq->ctx->engine[ring->id].pin_count == 0) {
intel_unpin_ringbuffer_obj(ringbuf);
i915_gem_object_ggtt_unpin(ctx_obj);
}
}
}
-void intel_lr_context_unpin(struct drm_i915_gem_request *rq)
-{
- __intel_lr_context_unpin(rq->ring, rq->ctx);
-}
-
-void intel_lr_context_complete_check(struct drm_i915_gem_request *req)
-{
- struct intel_engine_cs *ring = req->ring;
-
- if (ring->last_context && ring->last_context != req->ctx &&
- ring->last_context->engine[ring->id].dirty) {
- __intel_lr_context_unpin(
- ring,
- ring->last_context);
- ring->last_context->engine[ring->id].dirty = false;
- }
- ring->last_context = req->ctx;
-}
-
static int intel_logical_ring_workarounds_emit(struct drm_i915_gem_request *req)
{
int ret, i;
@@ -2368,76 +2352,6 @@ populate_lr_context(struct intel_context *ctx, struct drm_i915_gem_object *ctx_o
}
/**
- * intel_lr_context_clean_ring() - clean the ring specific parts of an LRC
- * @ctx: the LR context being freed.
- * @ring: the engine being cleaned
- * @ctx_obj: the hw context being unreferenced
- * @ringbuf: the ringbuf being freed
- *
- * Take care of cleaning up the per-engine backing
- * objects and the logical ringbuffer.
- */
-static void
-intel_lr_context_clean_ring(struct intel_context *ctx,
- struct intel_engine_cs *ring,
- struct drm_i915_gem_object *ctx_obj,
- struct intel_ringbuffer *ringbuf)
-{
- int ret;
-
- WARN_ON(!mutex_is_locked(&ring->dev->struct_mutex));
-
- if (ctx == ring->default_context) {
- intel_unpin_ringbuffer_obj(ringbuf);
- i915_gem_object_ggtt_unpin(ctx_obj);
- }
-
- if (ctx->engine[ring->id].dirty) {
- struct drm_i915_gem_request *req = NULL;
-
- /**
- * If there is already a request pending on
- * this ring, wait for that to complete,
- * otherwise create a switch to idle request
- */
- if (list_empty(&ring->request_list)) {
- int ret;
-
- ret = i915_gem_request_alloc(
- ring,
- ring->default_context,
- &req);
- if (!ret)
- i915_add_request(req);
- else
- DRM_DEBUG("Failed to ensure context saved");
- } else {
- req = list_first_entry(
- &ring->request_list,
- typeof(*req), list);
- }
- if (req) {
- ret = i915_wait_request(req);
- if (ret != 0) {
- /**
- * If we get here, there's probably been a ring
- * reset, so we just clean up the dirty flag.&
- * pin count.
- */
- ctx->engine[ring->id].dirty = false;
- __intel_lr_context_unpin(
- ring,
- ctx);
- }
- }
- }
-
- WARN_ON(ctx->engine[ring->id].pin_count);
- intel_ringbuffer_free(ringbuf);
- drm_gem_object_unreference(&ctx_obj->base);
-}
-
-/**
* intel_lr_context_free() - free the LRC specific bits of a context
* @ctx: the LR context to free.
*
@@ -2449,7 +2363,7 @@ void intel_lr_context_free(struct intel_context *ctx)
{
int i;
- for (i = 0; i < I915_NUM_RINGS; ++i) {
+ for (i = 0; i < I915_NUM_RINGS; i++) {
struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state;
if (ctx_obj) {
@@ -2457,10 +2371,13 @@ void intel_lr_context_free(struct intel_context *ctx)
ctx->engine[i].ringbuf;
struct intel_engine_cs *ring = ringbuf->ring;
- intel_lr_context_clean_ring(ctx,
- ring,
- ctx_obj,
- ringbuf);
+ if (ctx == ring->default_context) {
+ intel_unpin_ringbuffer_obj(ringbuf);
+ i915_gem_object_ggtt_unpin(ctx_obj);
+ }
+ WARN_ON(ctx->engine[ring->id].pin_count);
+ intel_ringbuffer_free(ringbuf);
+ drm_gem_object_unreference(&ctx_obj->base);
}
}
}
@@ -2622,12 +2539,5 @@ void intel_lr_context_reset(struct drm_device *dev,
ringbuf->head = 0;
ringbuf->tail = 0;
-
- if (ctx->engine[ring->id].dirty) {
- __intel_lr_context_unpin(
- ring,
- ctx);
- ctx->engine[ring->id].dirty = false;
- }
}
}
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index fd1b6b43bacc..0b821b91723a 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -91,7 +91,6 @@ void intel_lr_context_reset(struct drm_device *dev,
struct intel_context *ctx);
uint64_t intel_lr_context_descriptor(struct intel_context *ctx,
struct intel_engine_cs *ring);
-void intel_lr_context_complete_check(struct drm_i915_gem_request *req);
/* Execlists */
int intel_sanitize_enable_execlists(struct drm_device *dev, int enable_execlists);
--
2.5.1
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