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Code Issues Releases Wiki Activity

drm/i915/huc: stall media submission until HuC is loaded

Browse source 
Wait on the fence to be signalled to avoid the submissions finding HuC
not yet loaded.

v2: use dedicaded wait_queue_entry for waiting in HuC load, as submitq
can't be re-used for it.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Tony Ye <tony.ye@intel.com>
Acked-by: Tony Ye <tony.ye@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220928004145.745803-13-daniele.ceraolospurio@intel.com
This commit is contained in:
Daniele Ceraolo Spurio 2022-09-27 17:41:42 -07:00
parent 27536e0327
commit e6177ec586
3 changed files with 35 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/gpu/drm/i915/gt/uc/intel_huc.h
View file

@ -81,6 +81,12 @@ static inline bool intel_huc_is_loaded_by_gsc(const struct intel_huc *huc)
return huc->fw.loaded_via_gsc;
}
static inline bool intel_huc_wait_required(struct intel_huc *huc)
{
return intel_huc_is_used(huc) && intel_huc_is_loaded_by_gsc(huc) &&
!intel_huc_is_authenticated(huc);
}
void intel_huc_load_status(struct intel_huc *huc, struct drm_printer *p);
#endif

24
drivers/gpu/drm/i915/i915_request.c
View file

@ -1621,6 +1621,20 @@ i915_request_await_object(struct i915_request *to,
return ret;
}
static void i915_request_await_huc(struct i915_request *rq)
{
struct intel_huc *huc = &rq->context->engine->gt->uc.huc;
/* don't stall kernel submissions! */
if (!rcu_access_pointer(rq->context->gem_context))
return;
if (intel_huc_wait_required(huc))
i915_sw_fence_await_sw_fence(&rq->submit,
&huc->delayed_load.fence,
&rq->hucq);
}
static struct i915_request *
__i915_request_ensure_parallel_ordering(struct i915_request *rq,
struct intel_timeline *timeline)
@ -1702,6 +1716,16 @@ __i915_request_add_to_timeline(struct i915_request *rq)
struct intel_timeline *timeline = i915_request_timeline(rq);
struct i915_request *prev;
/*
* Media workloads may require HuC, so stall them until HuC loading is
* complete. Note that HuC not being loaded when a user submission
* arrives can only happen when HuC is loaded via GSC and in that case
* we still expect the window between us starting to accept submissions
* and HuC loading completion to be small (a few hundred ms).
*/
if (rq->engine->class == VIDEO_DECODE_CLASS)
i915_request_await_huc(rq);
/*
* Dependency tracking and request ordering along the timeline
* is special cased so that we can eliminate redundant ordering

5
drivers/gpu/drm/i915/i915_request.h
View file

@ -348,6 +348,11 @@ struct i915_request {
#define GUC_PRIO_FINI 0xfe
u8 guc_prio;
/**
* @hucq: wait queue entry used to wait on the HuC load to complete
*/
wait_queue_entry_t hucq;
I915_SELFTEST_DECLARE(struct {
struct list_head link;
unsigned long delay;