From 2a694feb93556e979793081b5086f26fa8d65156 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 3 Apr 2018 19:35:37 +0100 Subject: [PATCH] drm/i915: Store preemption capability in engine->flags MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Let's avoid having to delve down the pointer chain to see if the i915 device has support for preemption and store that on the engine, which made the decision in the first place! v2: Refactor common preemption policy between execlists/guc. Signed-off-by: Chris Wilson Cc: Tomasz Lis Cc: Daniele Ceraolo Spurio Cc: Michał Winiarski Cc: Tvrtko Ursulin Reviewed-by: Daniele Ceraolo Spurio Link: https://patchwork.freedesktop.org/patch/msgid/20180403183537.5522-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/intel_guc_submission.c | 16 +++++++++++++--- drivers/gpu/drm/i915/intel_lrc.c | 7 +++++-- drivers/gpu/drm/i915/intel_ringbuffer.h | 18 ++++++++++++++++-- 3 files changed, 34 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c index 749f27916a02..97121230656c 100644 --- a/drivers/gpu/drm/i915/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/intel_guc_submission.c @@ -657,6 +657,16 @@ static void port_assign(struct execlist_port *port, struct i915_request *rq) port_set(port, i915_request_get(rq)); } +static inline int rq_prio(const struct i915_request *rq) +{ + return rq->priotree.priority; +} + +static inline int port_prio(const struct execlist_port *port) +{ + return rq_prio(port_request(port)); +} + static void guc_dequeue(struct intel_engine_cs *engine) { struct intel_engine_execlists * const execlists = &engine->execlists; @@ -672,12 +682,12 @@ static void guc_dequeue(struct intel_engine_cs *engine) GEM_BUG_ON(rb_first(&execlists->queue) != rb); if (port_isset(port)) { - if (engine->i915->preempt_context) { + if (intel_engine_has_preemption(engine)) { struct guc_preempt_work *preempt_work = &engine->i915->guc.preempt_work[engine->id]; + int prio = execlists->queue_priority; - if (execlists->queue_priority > - max(port_request(port)->priotree.priority, 0)) { + if (__execlists_need_preempt(prio, port_prio(port))) { execlists_set_active(execlists, EXECLISTS_ACTIVE_PREEMPT); queue_work(engine->i915->guc.preempt_wq, diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 4d08875422b6..88472845ce96 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -183,7 +183,8 @@ static inline bool need_preempt(const struct intel_engine_cs *engine, const struct i915_request *last, int prio) { - return engine->i915->preempt_context && prio > max(rq_prio(last), 0); + return (intel_engine_has_preemption(engine) && + __execlists_need_preempt(prio, rq_prio(last))); } /** @@ -2117,11 +2118,13 @@ static void execlists_set_default_submission(struct intel_engine_cs *engine) engine->unpark = NULL; engine->flags |= I915_ENGINE_SUPPORTS_STATS; + if (engine->i915->preempt_context) + engine->flags |= I915_ENGINE_HAS_PREEMPTION; engine->i915->caps.scheduler = I915_SCHEDULER_CAP_ENABLED | I915_SCHEDULER_CAP_PRIORITY; - if (engine->i915->preempt_context) + if (intel_engine_has_preemption(engine)) engine->i915->caps.scheduler |= I915_SCHEDULER_CAP_PREEMPTION; } diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 40461e29cdab..256d58487559 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -562,6 +562,7 @@ struct intel_engine_cs { #define I915_ENGINE_NEEDS_CMD_PARSER BIT(0) #define I915_ENGINE_SUPPORTS_STATS BIT(1) +#define I915_ENGINE_HAS_PREEMPTION BIT(2) unsigned int flags; /* @@ -621,16 +622,29 @@ struct intel_engine_cs { } stats; }; -static inline bool intel_engine_needs_cmd_parser(struct intel_engine_cs *engine) +static inline bool +intel_engine_needs_cmd_parser(const struct intel_engine_cs *engine) { return engine->flags & I915_ENGINE_NEEDS_CMD_PARSER; } -static inline bool intel_engine_supports_stats(struct intel_engine_cs *engine) +static inline bool +intel_engine_supports_stats(const struct intel_engine_cs *engine) { return engine->flags & I915_ENGINE_SUPPORTS_STATS; } +static inline bool +intel_engine_has_preemption(const struct intel_engine_cs *engine) +{ + return engine->flags & I915_ENGINE_HAS_PREEMPTION; +} + +static inline bool __execlists_need_preempt(int prio, int last) +{ + return prio > max(0, last); +} + static inline void execlists_set_active(struct intel_engine_execlists *execlists, unsigned int bit) -- 2.30.2