With GuC virtual engines the physical engine which a request executes and completes on isn't known to the i915. Therefore we can't attach a request to a physical engines breadcrumbs. To work around this we create a single breadcrumbs per engine class when using GuC submission and direct all physical engine interrupts to this breadcrumbs.
v2: (John H) - Rework header file structure so intel_engine_mask_t can be in intel_engine_types.h
Signed-off-by: Matthew Brost matthew.brost@intel.com CC: John Harrison John.C.Harrison@Intel.com Reviewed-by: John Harrison John.C.Harrison@Intel.com --- drivers/gpu/drm/i915/gt/intel_breadcrumbs.c | 41 +++++------- drivers/gpu/drm/i915/gt/intel_breadcrumbs.h | 16 ++++- .../gpu/drm/i915/gt/intel_breadcrumbs_types.h | 7 ++ drivers/gpu/drm/i915/gt/intel_engine.h | 3 + drivers/gpu/drm/i915/gt/intel_engine_cs.c | 28 +++++++- drivers/gpu/drm/i915/gt/intel_engine_types.h | 2 +- .../drm/i915/gt/intel_execlists_submission.c | 2 +- drivers/gpu/drm/i915/gt/mock_engine.c | 4 +- .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 67 +++++++++++++++++-- 9 files changed, 133 insertions(+), 37 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c index 38cc42783dfb..2007dc6f6b99 100644 --- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c +++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.c @@ -15,28 +15,14 @@ #include "intel_gt_pm.h" #include "intel_gt_requests.h"
-static bool irq_enable(struct intel_engine_cs *engine) +static bool irq_enable(struct intel_breadcrumbs *b) { - if (!engine->irq_enable) - return false; - - /* Caller disables interrupts */ - spin_lock(&engine->gt->irq_lock); - engine->irq_enable(engine); - spin_unlock(&engine->gt->irq_lock); - - return true; + return intel_engine_irq_enable(b->irq_engine); }
-static void irq_disable(struct intel_engine_cs *engine) +static void irq_disable(struct intel_breadcrumbs *b) { - if (!engine->irq_disable) - return; - - /* Caller disables interrupts */ - spin_lock(&engine->gt->irq_lock); - engine->irq_disable(engine); - spin_unlock(&engine->gt->irq_lock); + intel_engine_irq_disable(b->irq_engine); }
static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b) @@ -57,7 +43,7 @@ static void __intel_breadcrumbs_arm_irq(struct intel_breadcrumbs *b) WRITE_ONCE(b->irq_armed, true);
/* Requests may have completed before we could enable the interrupt. */ - if (!b->irq_enabled++ && irq_enable(b->irq_engine)) + if (!b->irq_enabled++ && b->irq_enable(b)) irq_work_queue(&b->irq_work); }
@@ -76,7 +62,7 @@ static void __intel_breadcrumbs_disarm_irq(struct intel_breadcrumbs *b) { GEM_BUG_ON(!b->irq_enabled); if (!--b->irq_enabled) - irq_disable(b->irq_engine); + b->irq_disable(b);
WRITE_ONCE(b->irq_armed, false); intel_gt_pm_put_async(b->irq_engine->gt); @@ -281,7 +267,7 @@ intel_breadcrumbs_create(struct intel_engine_cs *irq_engine) if (!b) return NULL;
- b->irq_engine = irq_engine; + kref_init(&b->ref);
spin_lock_init(&b->signalers_lock); INIT_LIST_HEAD(&b->signalers); @@ -290,6 +276,10 @@ intel_breadcrumbs_create(struct intel_engine_cs *irq_engine) spin_lock_init(&b->irq_lock); init_irq_work(&b->irq_work, signal_irq_work);
+ b->irq_engine = irq_engine; + b->irq_enable = irq_enable; + b->irq_disable = irq_disable; + return b; }
@@ -303,9 +293,9 @@ void intel_breadcrumbs_reset(struct intel_breadcrumbs *b) spin_lock_irqsave(&b->irq_lock, flags);
if (b->irq_enabled) - irq_enable(b->irq_engine); + b->irq_enable(b); else - irq_disable(b->irq_engine); + b->irq_disable(b);
spin_unlock_irqrestore(&b->irq_lock, flags); } @@ -325,11 +315,14 @@ void __intel_breadcrumbs_park(struct intel_breadcrumbs *b) } }
-void intel_breadcrumbs_free(struct intel_breadcrumbs *b) +void intel_breadcrumbs_free(struct kref *kref) { + struct intel_breadcrumbs *b = container_of(kref, typeof(*b), ref); + irq_work_sync(&b->irq_work); GEM_BUG_ON(!list_empty(&b->signalers)); GEM_BUG_ON(b->irq_armed); + kfree(b); }
diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h index 3ce5ce270b04..be0d4f379a85 100644 --- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h +++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs.h @@ -9,7 +9,7 @@ #include <linux/atomic.h> #include <linux/irq_work.h>
-#include "intel_engine_types.h" +#include "intel_breadcrumbs_types.h"
struct drm_printer; struct i915_request; @@ -17,7 +17,7 @@ struct intel_breadcrumbs;
struct intel_breadcrumbs * intel_breadcrumbs_create(struct intel_engine_cs *irq_engine); -void intel_breadcrumbs_free(struct intel_breadcrumbs *b); +void intel_breadcrumbs_free(struct kref *kref);
void intel_breadcrumbs_reset(struct intel_breadcrumbs *b); void __intel_breadcrumbs_park(struct intel_breadcrumbs *b); @@ -48,4 +48,16 @@ void i915_request_cancel_breadcrumb(struct i915_request *request); void intel_context_remove_breadcrumbs(struct intel_context *ce, struct intel_breadcrumbs *b);
+static inline struct intel_breadcrumbs * +intel_breadcrumbs_get(struct intel_breadcrumbs *b) +{ + kref_get(&b->ref); + return b; +} + +static inline void intel_breadcrumbs_put(struct intel_breadcrumbs *b) +{ + kref_put(&b->ref, intel_breadcrumbs_free); +} + #endif /* __INTEL_BREADCRUMBS__ */ diff --git a/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h b/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h index 3a084ce8ff5e..72dfd3748c4c 100644 --- a/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h +++ b/drivers/gpu/drm/i915/gt/intel_breadcrumbs_types.h @@ -7,10 +7,13 @@ #define __INTEL_BREADCRUMBS_TYPES__
#include <linux/irq_work.h> +#include <linux/kref.h> #include <linux/list.h> #include <linux/spinlock.h> #include <linux/types.h>
+#include "intel_engine_types.h" + /* * Rather than have every client wait upon all user interrupts, * with the herd waking after every interrupt and each doing the @@ -29,6 +32,7 @@ * the overhead of waking that client is much preferred. */ struct intel_breadcrumbs { + struct kref ref; atomic_t active;
spinlock_t signalers_lock; /* protects the list of signalers */ @@ -42,7 +46,10 @@ struct intel_breadcrumbs { bool irq_armed;
/* Not all breadcrumbs are attached to physical HW */ + intel_engine_mask_t engine_mask; struct intel_engine_cs *irq_engine; + bool (*irq_enable)(struct intel_breadcrumbs *b); + void (*irq_disable)(struct intel_breadcrumbs *b); };
#endif /* __INTEL_BREADCRUMBS_TYPES__ */ diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h index 13bfb7ec33b2..8fc76dc8bf98 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine.h +++ b/drivers/gpu/drm/i915/gt/intel_engine.h @@ -212,6 +212,9 @@ void intel_engine_get_instdone(const struct intel_engine_cs *engine,
void intel_engine_init_execlists(struct intel_engine_cs *engine);
+bool intel_engine_irq_enable(struct intel_engine_cs *engine); +void intel_engine_irq_disable(struct intel_engine_cs *engine); + static inline void __intel_engine_reset(struct intel_engine_cs *engine, bool stalled) { diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c index 6a7edc839a2c..1eaa658507e1 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c @@ -798,7 +798,7 @@ static int engine_setup_common(struct intel_engine_cs *engine) err_cmd_parser: i915_sched_engine_put(engine->sched_engine); err_sched_engine: - intel_breadcrumbs_free(engine->breadcrumbs); + intel_breadcrumbs_put(engine->breadcrumbs); err_status: cleanup_status_page(engine); return err; @@ -1007,7 +1007,7 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine) GEM_BUG_ON(!list_empty(&engine->sched_engine->requests));
i915_sched_engine_put(engine->sched_engine); - intel_breadcrumbs_free(engine->breadcrumbs); + intel_breadcrumbs_put(engine->breadcrumbs);
intel_engine_fini_retire(engine); intel_engine_cleanup_cmd_parser(engine); @@ -1324,6 +1324,30 @@ bool intel_engines_are_idle(struct intel_gt *gt) return true; }
+bool intel_engine_irq_enable(struct intel_engine_cs *engine) +{ + if (!engine->irq_enable) + return false; + + /* Caller disables interrupts */ + spin_lock(&engine->gt->irq_lock); + engine->irq_enable(engine); + spin_unlock(&engine->gt->irq_lock); + + return true; +} + +void intel_engine_irq_disable(struct intel_engine_cs *engine) +{ + if (!engine->irq_disable) + return; + + /* Caller disables interrupts */ + spin_lock(&engine->gt->irq_lock); + engine->irq_disable(engine); + spin_unlock(&engine->gt->irq_lock); +} + void intel_engines_reset_default_submission(struct intel_gt *gt) { struct intel_engine_cs *engine; diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h index 75a34cd3f1c2..e55776e27a2a 100644 --- a/drivers/gpu/drm/i915/gt/intel_engine_types.h +++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h @@ -21,7 +21,6 @@ #include "i915_pmu.h" #include "i915_priolist_types.h" #include "i915_selftest.h" -#include "intel_breadcrumbs_types.h" #include "intel_sseu.h" #include "intel_timeline_types.h" #include "intel_uncore.h" @@ -52,6 +51,7 @@ struct i915_sched_engine; struct intel_gt; struct intel_ring; struct intel_uncore; +struct intel_breadcrumbs;
typedef u32 intel_engine_mask_t; #define ALL_ENGINES ((intel_engine_mask_t)~0ul) diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c index 1e76768dc5e9..6e4959ee5065 100644 --- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c +++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c @@ -3457,7 +3457,7 @@ static void rcu_virtual_context_destroy(struct work_struct *wrk) intel_context_fini(&ve->context);
if (ve->base.breadcrumbs) - intel_breadcrumbs_free(ve->base.breadcrumbs); + intel_breadcrumbs_put(ve->base.breadcrumbs); if (ve->base.sched_engine) i915_sched_engine_put(ve->base.sched_engine); intel_engine_free_request_pool(&ve->base); diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c index 68970398e4ef..2ddaacb4e753 100644 --- a/drivers/gpu/drm/i915/gt/mock_engine.c +++ b/drivers/gpu/drm/i915/gt/mock_engine.c @@ -284,7 +284,7 @@ static void mock_engine_release(struct intel_engine_cs *engine) GEM_BUG_ON(timer_pending(&mock->hw_delay));
i915_sched_engine_put(engine->sched_engine); - intel_breadcrumbs_free(engine->breadcrumbs); + intel_breadcrumbs_put(engine->breadcrumbs);
intel_context_unpin(engine->kernel_context); intel_context_put(engine->kernel_context); @@ -370,7 +370,7 @@ int mock_engine_init(struct intel_engine_cs *engine) return 0;
err_breadcrumbs: - intel_breadcrumbs_free(engine->breadcrumbs); + intel_breadcrumbs_put(engine->breadcrumbs); err_schedule: i915_sched_engine_put(engine->sched_engine); return -ENOMEM; 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 6b08221df143..60a73d9a00f6 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1087,6 +1087,9 @@ static void __guc_context_destroy(struct intel_context *ce) struct guc_virtual_engine *ve = container_of(ce, typeof(*ve), context);
+ if (ve->base.breadcrumbs) + intel_breadcrumbs_put(ve->base.breadcrumbs); + kfree(ve); } else { intel_context_free(ce); @@ -1378,6 +1381,62 @@ static const struct intel_context_ops virtual_guc_context_ops = { .get_sibling = guc_virtual_get_sibling, };
+static bool +guc_irq_enable_breadcrumbs(struct intel_breadcrumbs *b) +{ + struct intel_engine_cs *sibling; + intel_engine_mask_t tmp, mask = b->engine_mask; + bool result = false; + + for_each_engine_masked(sibling, b->irq_engine->gt, mask, tmp) + result |= intel_engine_irq_enable(sibling); + + return result; +} + +static void +guc_irq_disable_breadcrumbs(struct intel_breadcrumbs *b) +{ + struct intel_engine_cs *sibling; + intel_engine_mask_t tmp, mask = b->engine_mask; + + for_each_engine_masked(sibling, b->irq_engine->gt, mask, tmp) + intel_engine_irq_disable(sibling); +} + +static void guc_init_breadcrumbs(struct intel_engine_cs *engine) +{ + int i; + + /* + * In GuC submission mode we do not know which physical engine a request + * will be scheduled on, this creates a problem because the breadcrumb + * interrupt is per physical engine. To work around this we attach + * requests and direct all breadcrumb interrupts to the first instance + * of an engine per class. In addition all breadcrumb interrupts are + * enabled / disabled across an engine class in unison. + */ + for (i = 0; i < MAX_ENGINE_INSTANCE; ++i) { + struct intel_engine_cs *sibling = + engine->gt->engine_class[engine->class][i]; + + if (sibling) { + if (engine->breadcrumbs != sibling->breadcrumbs) { + intel_breadcrumbs_put(engine->breadcrumbs); + engine->breadcrumbs = + intel_breadcrumbs_get(sibling->breadcrumbs); + } + break; + } + } + + if (engine->breadcrumbs) { + engine->breadcrumbs->engine_mask |= engine->mask; + engine->breadcrumbs->irq_enable = guc_irq_enable_breadcrumbs; + engine->breadcrumbs->irq_disable = guc_irq_disable_breadcrumbs; + } +} + static void sanitize_hwsp(struct intel_engine_cs *engine) { struct intel_timeline *tl; @@ -1590,6 +1649,7 @@ int intel_guc_submission_setup(struct intel_engine_cs *engine)
guc_default_vfuncs(engine); guc_default_irqs(engine); + guc_init_breadcrumbs(engine);
if (engine->class == RENDER_CLASS) rcs_submission_override(engine); @@ -1832,11 +1892,6 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count) ve->base.instance = I915_ENGINE_CLASS_INVALID_VIRTUAL; ve->base.uabi_instance = I915_ENGINE_CLASS_INVALID_VIRTUAL; ve->base.saturated = ALL_ENGINES; - ve->base.breadcrumbs = intel_breadcrumbs_create(&ve->base); - if (!ve->base.breadcrumbs) { - kfree(ve); - return ERR_PTR(-ENOMEM); - }
snprintf(ve->base.name, sizeof(ve->base.name), "virtual");
@@ -1885,6 +1940,8 @@ guc_create_virtual(struct intel_engine_cs **siblings, unsigned int count) sibling->emit_fini_breadcrumb; ve->base.emit_fini_breadcrumb_dw = sibling->emit_fini_breadcrumb_dw; + ve->base.breadcrumbs = + intel_breadcrumbs_get(sibling->breadcrumbs);
ve->base.flags |= sibling->flags;