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drm/i915/guc: Unwind GuC workqueue reservation if request construction fails 

We reserve space in the GuC workqueue for submitting the request in the
future. However, if we fail to construct the request, we need to give
that reserved space back to the system.

Fixes: dadd481bfe ("drm/i915/guc: Prepare for nonblocking execbuf submission")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97978
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161007065327.24515-4-chris@chris-wilson.co.uk
hifive-unleashed-5.1
Chris Wilson 2016-10-07 07:53:27 +01:00
parent ad07dfcddf
commit 5ba899082c
3 changed files with 23 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/gpu/drm/i915/i915_guc_submission.c
View File

@ -451,6 +451,18 @@ int i915_guc_wq_reserve(struct drm_i915_gem_request *request)
return ret;
}
void i915_guc_wq_unreserve(struct drm_i915_gem_request *request)
{
const size_t wqi_size = sizeof(struct guc_wq_item);
struct i915_guc_client *gc = request->i915->guc.execbuf_client;
GEM_BUG_ON(READ_ONCE(gc->wq_rsvd) < wqi_size);
spin_lock(&gc->wq_lock);
gc->wq_rsvd -= wqi_size;
spin_unlock(&gc->wq_lock);
}
/* Construct a Work Item and append it to the GuC's Work Queue */
static void guc_wq_item_append(struct i915_guc_client *gc,
struct drm_i915_gem_request *rq)

1
drivers/gpu/drm/i915/intel_guc.h
View File

@ -160,6 +160,7 @@ extern int intel_guc_resume(struct drm_device *dev);
int i915_guc_submission_init(struct drm_i915_private *dev_priv);
int i915_guc_submission_enable(struct drm_i915_private *dev_priv);
int i915_guc_wq_reserve(struct drm_i915_gem_request *rq);
void i915_guc_wq_unreserve(struct drm_i915_gem_request *request);
void i915_guc_submission_disable(struct drm_i915_private *dev_priv);
void i915_guc_submission_fini(struct drm_i915_private *dev_priv);

17
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -626,6 +626,10 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
request->ring = ce->ring;
ret = intel_lr_context_pin(request->ctx, engine);
if (ret)
return ret;
if (i915.enable_guc_submission) {
/*
* Check that the GuC has space for the request before
@ -634,21 +638,17 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
*/
ret = i915_guc_wq_reserve(request);
if (ret)
return ret;
goto err_unpin;
}
ret = intel_lr_context_pin(request->ctx, engine);
if (ret)
return ret;
ret = intel_ring_begin(request, 0);
if (ret)
goto err_unpin;
goto err_unreserve;
if (!ce->initialised) {
ret = engine->init_context(request);
if (ret)
goto err_unpin;
goto err_unreserve;
ce->initialised = true;
}
@ -663,6 +663,9 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
request->reserved_space -= EXECLISTS_REQUEST_SIZE;
return 0;
err_unreserve:
if (i915.enable_guc_submission)
i915_guc_wq_unreserve(request);
err_unpin:
intel_lr_context_unpin(request->ctx, engine);
return ret;