[Intel-gfx] [PATCH] drm/i915/guc: Fix revocation of non-persistent contexts
Andrzej Hajda
andrzej.hajda at intel.com
Fri Sep 30 14:52:55 UTC 2022
On 30.09.2022 11:47, Tvrtko Ursulin wrote:
> From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
>
> Patch which added graceful exit for non-persistent contexts missed the
> fact it is not enough to set the exiting flag on a context and let the
> backend handle it from there.
>
> GuC backend cannot handle it because it runs independently in the
> firmware and driver might not see the requests ever again. Patch also
> missed the fact some usages of intel_context_is_banned in the GuC backend
> needed replacing with newly introduced intel_context_is_schedulable.
>
> Fix the first issue by calling into backend revoke when we know this is
> the last chance to do it. Fix the second issue by replacing
> intel_context_is_banned with intel_context_is_schedulable, which should
> always be safe since latter is a superset of the former.
negation of the latter is a ...?
>
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
> Fixes: 45c64ecf97ee ("drm/i915: Improve user experience and driver robustness under SIGINT or similar")
> Cc: Andrzej Hajda <andrzej.hajda at intel.com>
> Cc: John Harrison <John.C.Harrison at Intel.com>
> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_context.c | 8 +-----
> drivers/gpu/drm/i915/gt/intel_context.c | 14 +++++++---
> drivers/gpu/drm/i915/gt/intel_context.h | 8 +-----
> .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 26 +++++++++----------
> 4 files changed, 25 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index 0bcde53c50c6..1e29b1e6d186 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -1387,14 +1387,8 @@ kill_engines(struct i915_gem_engines *engines, bool exit, bool persistent)
> */
> for_each_gem_engine(ce, engines, it) {
> struct intel_engine_cs *engine;
> - bool skip = false;
>
> - if (exit)
> - skip = intel_context_set_exiting(ce);
> - else if (!persistent)
> - skip = intel_context_exit_nonpersistent(ce, NULL); > -
> - if (skip)
> + if ((exit || !persistent) && intel_context_revoke(ce))
> continue; /* Already marked. */
>
> /*
> diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
> index 654a092ed3d6..398b2a9eed61 100644
> --- a/drivers/gpu/drm/i915/gt/intel_context.c
> +++ b/drivers/gpu/drm/i915/gt/intel_context.c
> @@ -614,13 +614,19 @@ bool intel_context_ban(struct intel_context *ce, struct i915_request *rq)
> return ret;
> }
>
> -bool intel_context_exit_nonpersistent(struct intel_context *ce,
> - struct i915_request *rq)
> +bool intel_context_revoke(struct intel_context *ce)
> {
> bool ret = intel_context_set_exiting(ce);
>
> - if (ce->ops->revoke)
> - ce->ops->revoke(ce, rq, ce->engine->props.preempt_timeout_ms);
> + if (!ret && intel_engine_uses_guc(ce->engine)) {
> + /*
> + * With GuC backend we have to notify it of revocation as soon
> + * as the exiting flag is set.
> + */
> + if (ce->ops->revoke)
> + ce->ops->revoke(ce, NULL,
> + ce->engine->props.preempt_timeout_ms);
> + }
Now revoke is called only with GuC, previously it was called also for
other backends in case non-exiting/non-persistent, is it OK?
>
> return ret;
> }
> diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h
> index 8e2d70630c49..40f8809d14ea 100644
> --- a/drivers/gpu/drm/i915/gt/intel_context.h
> +++ b/drivers/gpu/drm/i915/gt/intel_context.h
> @@ -319,18 +319,12 @@ static inline bool intel_context_is_schedulable(const struct intel_context *ce)
> !test_bit(CONTEXT_BANNED, &ce->flags);
> }
>
> -static inline bool intel_context_is_exiting(const struct intel_context *ce)
> -{
> - return test_bit(CONTEXT_EXITING, &ce->flags);
> -}
> -
> static inline bool intel_context_set_exiting(struct intel_context *ce)
> {
> return test_and_set_bit(CONTEXT_EXITING, &ce->flags);
> }
>
> -bool intel_context_exit_nonpersistent(struct intel_context *ce,
> - struct i915_request *rq);
> +bool intel_context_revoke(struct intel_context *ce);
>
> static inline bool
> intel_context_force_single_submission(const struct intel_context *ce)
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> index 0ef295a94060..88a4476b8e92 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> @@ -685,7 +685,7 @@ static int __guc_add_request(struct intel_guc *guc, struct i915_request *rq)
> * Corner case where requests were sitting in the priority list or a
> * request resubmitted after the context was banned.
> */
> - if (unlikely(intel_context_is_banned(ce))) {
> + if (unlikely(!intel_context_is_schedulable(ce))) {
> i915_request_put(i915_request_mark_eio(rq));
> intel_engine_signal_breadcrumbs(ce->engine);
> return 0;
> @@ -871,15 +871,15 @@ static int guc_wq_item_append(struct intel_guc *guc,
> struct i915_request *rq)
> {
> struct intel_context *ce = request_to_scheduling_context(rq);
> - int ret = 0;
> + int ret;
>
> - if (likely(!intel_context_is_banned(ce))) {
> - ret = __guc_wq_item_append(rq);
> + if (unlikely(!intel_context_is_schedulable(ce)))
> + return 0;
>
> - if (unlikely(ret == -EBUSY)) {
> - guc->stalled_request = rq;
> - guc->submission_stall_reason = STALL_MOVE_LRC_TAIL;
> - }
> + ret = __guc_wq_item_append(rq);
> + if (unlikely(ret == -EBUSY)) {
> + guc->stalled_request = rq;
> + guc->submission_stall_reason = STALL_MOVE_LRC_TAIL;
> }
>
> return ret;
> @@ -898,7 +898,7 @@ static bool multi_lrc_submit(struct i915_request *rq)
> * submitting all the requests generated in parallel.
> */
> return test_bit(I915_FENCE_FLAG_SUBMIT_PARALLEL, &rq->fence.flags) ||
> - intel_context_is_banned(ce);
> + !intel_context_is_schedulable(ce);
> }
>
> static int guc_dequeue_one_context(struct intel_guc *guc)
> @@ -967,7 +967,7 @@ static int guc_dequeue_one_context(struct intel_guc *guc)
> struct intel_context *ce = request_to_scheduling_context(last);
>
> if (unlikely(!ctx_id_mapped(guc, ce->guc_id.id) &&
> - !intel_context_is_banned(ce))) {
> + intel_context_is_schedulable(ce))) {
> ret = try_context_registration(ce, false);
> if (unlikely(ret == -EPIPE)) {
> goto deadlk;
> @@ -1577,7 +1577,7 @@ static void guc_reset_state(struct intel_context *ce, u32 head, bool scrub)
> {
> struct intel_engine_cs *engine = __context_to_physical_engine(ce);
>
> - if (intel_context_is_banned(ce))
> + if (!intel_context_is_schedulable(ce))
> return;
>
> GEM_BUG_ON(!intel_context_is_pinned(ce));
> @@ -4518,12 +4518,12 @@ static void guc_handle_context_reset(struct intel_guc *guc,
> {
> trace_intel_context_reset(ce);
>
> - if (likely(!intel_context_is_banned(ce))) {
> + if (likely(intel_context_is_schedulable(ce))) {
> capture_error_state(guc, ce);
> guc_context_replay(ce);
> } else {
> drm_info(&guc_to_gt(guc)->i915->drm,
> - "Ignoring context reset notification of banned context 0x%04X on %s",
> + "Ignoring context reset notification of exiting context 0x%04X on %s",
With small clarifications:
Reviewed-by: Andrzej Hajda <andrzej.hajda at intel.com>
Regards
Andrzej
> ce->guc_id.id, ce->engine->name);
> }
> }
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