diff options
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.c | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 138 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.h | 26 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_sw_fence.c | 4 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_sw_fence.h | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_engine_cs.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_gpu_commands.h | 9 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.h | 7 |
9 files changed, 180 insertions, 11 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index c6354f6cdbdb..c08abdef5eb6 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -351,7 +351,7 @@ static int i915_getparam_ioctl(struct drm_device *dev, void *data, value = min_t(int, INTEL_PPGTT(dev_priv), I915_GEM_PPGTT_FULL); break; case I915_PARAM_HAS_SEMAPHORES: - value = 0; + value = !!(dev_priv->caps.scheduler & I915_SCHEDULER_CAP_SEMAPHORES); break; case I915_PARAM_HAS_SECURE_BATCHES: value = capable(CAP_SYS_ADMIN); diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index d354967d6ae8..59e30b8c4ee9 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -22,8 +22,9 @@ * */ -#include <linux/prefetch.h> #include <linux/dma-fence-array.h> +#include <linux/irq_work.h> +#include <linux/prefetch.h> #include <linux/sched.h> #include <linux/sched/clock.h> #include <linux/sched/signal.h> @@ -32,9 +33,16 @@ #include "i915_active.h" #include "i915_reset.h" +struct execute_cb { + struct list_head link; + struct irq_work work; + struct i915_sw_fence *fence; +}; + static struct i915_global_request { struct kmem_cache *slab_requests; struct kmem_cache *slab_dependencies; + struct kmem_cache *slab_execute_cbs; } global; static const char *i915_fence_get_driver_name(struct dma_fence *fence) @@ -325,6 +333,69 @@ void i915_request_retire_upto(struct i915_request *rq) } while (tmp != rq); } +static void irq_execute_cb(struct irq_work *wrk) +{ + struct execute_cb *cb = container_of(wrk, typeof(*cb), work); + + i915_sw_fence_complete(cb->fence); + kmem_cache_free(global.slab_execute_cbs, cb); +} + +static void __notify_execute_cb(struct i915_request *rq) +{ + struct execute_cb *cb; + + lockdep_assert_held(&rq->lock); + + if (list_empty(&rq->execute_cb)) + return; + + list_for_each_entry(cb, &rq->execute_cb, link) + irq_work_queue(&cb->work); + + /* + * XXX Rollback on __i915_request_unsubmit() + * + * In the future, perhaps when we have an active time-slicing scheduler, + * it will be interesting to unsubmit parallel execution and remove + * busywaits from the GPU until their master is restarted. This is + * quite hairy, we have to carefully rollback the fence and do a + * preempt-to-idle cycle on the target engine, all the while the + * master execute_cb may refire. + */ + INIT_LIST_HEAD(&rq->execute_cb); +} + +static int +i915_request_await_execution(struct i915_request *rq, + struct i915_request *signal, + gfp_t gfp) +{ + struct execute_cb *cb; + + if (i915_request_is_active(signal)) + return 0; + + cb = kmem_cache_alloc(global.slab_execute_cbs, gfp); + if (!cb) + return -ENOMEM; + + cb->fence = &rq->submit; + i915_sw_fence_await(cb->fence); + init_irq_work(&cb->work, irq_execute_cb); + + spin_lock_irq(&signal->lock); + if (i915_request_is_active(signal)) { + i915_sw_fence_complete(cb->fence); + kmem_cache_free(global.slab_execute_cbs, cb); + } else { + list_add_tail(&cb->link, &signal->execute_cb); + } + spin_unlock_irq(&signal->lock); + + return 0; +} + static void move_to_timeline(struct i915_request *request, struct i915_timeline *timeline) { @@ -361,6 +432,8 @@ void __i915_request_submit(struct i915_request *request) !i915_request_enable_breadcrumb(request)) intel_engine_queue_breadcrumbs(engine); + __notify_execute_cb(request); + spin_unlock(&request->lock); engine->emit_fini_breadcrumb(request, @@ -608,6 +681,7 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx) } INIT_LIST_HEAD(&rq->active_list); + INIT_LIST_HEAD(&rq->execute_cb); tl = ce->ring->timeline; ret = i915_timeline_get_seqno(tl, rq, &seqno); @@ -697,6 +771,52 @@ err_unreserve: } static int +emit_semaphore_wait(struct i915_request *to, + struct i915_request *from, + gfp_t gfp) +{ + u32 hwsp_offset; + u32 *cs; + int err; + + GEM_BUG_ON(!from->timeline->has_initial_breadcrumb); + GEM_BUG_ON(INTEL_GEN(to->i915) < 8); + + /* We need to pin the signaler's HWSP until we are finished reading. */ + err = i915_timeline_read_hwsp(from, to, &hwsp_offset); + if (err) + return err; + + /* Only submit our spinner after the signaler is running! */ + err = i915_request_await_execution(to, from, gfp); + if (err) + return err; + + cs = intel_ring_begin(to, 4); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + /* + * Using greater-than-or-equal here means we have to worry + * about seqno wraparound. To side step that issue, we swap + * the timeline HWSP upon wrapping, so that everyone listening + * for the old (pre-wrap) values do not see the much smaller + * (post-wrap) values than they were expecting (and so wait + * forever). + */ + *cs++ = MI_SEMAPHORE_WAIT | + MI_SEMAPHORE_GLOBAL_GTT | + MI_SEMAPHORE_POLL | + MI_SEMAPHORE_SAD_GTE_SDD; + *cs++ = from->fence.seqno; + *cs++ = hwsp_offset; + *cs++ = 0; + + intel_ring_advance(to, cs); + return 0; +} + +static int i915_request_await_request(struct i915_request *to, struct i915_request *from) { int ret; @@ -717,6 +837,9 @@ i915_request_await_request(struct i915_request *to, struct i915_request *from) ret = i915_sw_fence_await_sw_fence_gfp(&to->submit, &from->submit, I915_FENCE_GFP); + } else if (intel_engine_has_semaphores(to->engine) && + to->gem_context->sched.priority >= I915_PRIORITY_NORMAL) { + ret = emit_semaphore_wait(to, from, I915_FENCE_GFP); } else { ret = i915_sw_fence_await_dma_fence(&to->submit, &from->fence, 0, @@ -1208,14 +1331,23 @@ int __init i915_global_request_init(void) if (!global.slab_requests) return -ENOMEM; + global.slab_execute_cbs = KMEM_CACHE(execute_cb, + SLAB_HWCACHE_ALIGN | + SLAB_RECLAIM_ACCOUNT | + SLAB_TYPESAFE_BY_RCU); + if (!global.slab_execute_cbs) + goto err_requests; + global.slab_dependencies = KMEM_CACHE(i915_dependency, SLAB_HWCACHE_ALIGN | SLAB_RECLAIM_ACCOUNT); if (!global.slab_dependencies) - goto err_requests; + goto err_execute_cbs; return 0; +err_execute_cbs: + kmem_cache_destroy(global.slab_execute_cbs); err_requests: kmem_cache_destroy(global.slab_requests); return -ENOMEM; @@ -1224,11 +1356,13 @@ err_requests: void i915_global_request_shrink(void) { kmem_cache_shrink(global.slab_dependencies); + kmem_cache_shrink(global.slab_execute_cbs); kmem_cache_shrink(global.slab_requests); } void i915_global_request_exit(void) { kmem_cache_destroy(global.slab_dependencies); + kmem_cache_destroy(global.slab_execute_cbs); kmem_cache_destroy(global.slab_requests); } diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h index 09eaad06d2c6..4dd1dea1d1af 100644 --- a/drivers/gpu/drm/i915/i915_request.h +++ b/drivers/gpu/drm/i915/i915_request.h @@ -129,6 +129,7 @@ struct i915_request { */ struct i915_sw_fence submit; wait_queue_entry_t submitq; + struct list_head execute_cb; /* * A list of everyone we wait upon, and everyone who waits upon us. @@ -343,10 +344,27 @@ static inline bool __i915_request_has_started(const struct i915_request *rq) * i915_request_started - check if the request has begun being executed * @rq: the request * - * Returns true if the request has been submitted to hardware, and the hardware - * has advanced passed the end of the previous request and so should be either - * currently processing the request (though it may be preempted and so - * not necessarily the next request to complete) or have completed the request. + * If the timeline is not using initial breadcrumbs, a request is + * considered started if the previous request on its timeline (i.e. + * context) has been signaled. + * + * If the timeline is using semaphores, it will also be emitting an + * "initial breadcrumb" after the semaphores are complete and just before + * it began executing the user payload. A request can therefore be active + * on the HW and not yet started as it is still busywaiting on its + * dependencies (via HW semaphores). + * + * If the request has started, its dependencies will have been signaled + * (either by fences or by semaphores) and it will have begun processing + * the user payload. + * + * However, even if a request has started, it may have been preempted and + * so no longer active, or it may have already completed. + * + * See also i915_request_is_active(). + * + * Returns true if the request has begun executing the user payload, or + * has completed: */ static inline bool i915_request_started(const struct i915_request *rq) { diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c index 7c58b049ecb5..8d1400d378d7 100644 --- a/drivers/gpu/drm/i915/i915_sw_fence.c +++ b/drivers/gpu/drm/i915/i915_sw_fence.c @@ -192,7 +192,7 @@ static void __i915_sw_fence_complete(struct i915_sw_fence *fence, __i915_sw_fence_notify(fence, FENCE_FREE); } -static void i915_sw_fence_complete(struct i915_sw_fence *fence) +void i915_sw_fence_complete(struct i915_sw_fence *fence) { debug_fence_assert(fence); @@ -202,7 +202,7 @@ static void i915_sw_fence_complete(struct i915_sw_fence *fence) __i915_sw_fence_complete(fence, NULL); } -static void i915_sw_fence_await(struct i915_sw_fence *fence) +void i915_sw_fence_await(struct i915_sw_fence *fence) { debug_fence_assert(fence); WARN_ON(atomic_inc_return(&fence->pending) <= 1); diff --git a/drivers/gpu/drm/i915/i915_sw_fence.h b/drivers/gpu/drm/i915/i915_sw_fence.h index 0e055ea0179f..6dec9e1d1102 100644 --- a/drivers/gpu/drm/i915/i915_sw_fence.h +++ b/drivers/gpu/drm/i915/i915_sw_fence.h @@ -79,6 +79,9 @@ int i915_sw_fence_await_reservation(struct i915_sw_fence *fence, unsigned long timeout, gfp_t gfp); +void i915_sw_fence_await(struct i915_sw_fence *fence); +void i915_sw_fence_complete(struct i915_sw_fence *fence); + static inline bool i915_sw_fence_signaled(const struct i915_sw_fence *fence) { return atomic_read(&fence->pending) <= 0; diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c index df8f88142f1d..4fc7e2ac6278 100644 --- a/drivers/gpu/drm/i915/intel_engine_cs.c +++ b/drivers/gpu/drm/i915/intel_engine_cs.c @@ -616,6 +616,7 @@ void intel_engines_set_scheduler_caps(struct drm_i915_private *i915) } map[] = { #define MAP(x, y) { ilog2(I915_ENGINE_HAS_##x), ilog2(I915_SCHEDULER_CAP_##y) } MAP(PREEMPTION, PREEMPTION), + MAP(SEMAPHORES, SEMAPHORES), #undef MAP }; struct intel_engine_cs *engine; diff --git a/drivers/gpu/drm/i915/intel_gpu_commands.h b/drivers/gpu/drm/i915/intel_gpu_commands.h index b96a31bc1080..a34ece53a771 100644 --- a/drivers/gpu/drm/i915/intel_gpu_commands.h +++ b/drivers/gpu/drm/i915/intel_gpu_commands.h @@ -105,8 +105,13 @@ #define MI_SEMAPHORE_SIGNAL MI_INSTR(0x1b, 0) /* GEN8+ */ #define MI_SEMAPHORE_TARGET(engine) ((engine)<<15) #define MI_SEMAPHORE_WAIT MI_INSTR(0x1c, 2) /* GEN8+ */ -#define MI_SEMAPHORE_POLL (1<<15) -#define MI_SEMAPHORE_SAD_GTE_SDD (1<<12) +#define MI_SEMAPHORE_POLL (1 << 15) +#define MI_SEMAPHORE_SAD_GT_SDD (0 << 12) +#define MI_SEMAPHORE_SAD_GTE_SDD (1 << 12) +#define MI_SEMAPHORE_SAD_LT_SDD (2 << 12) +#define MI_SEMAPHORE_SAD_LTE_SDD (3 << 12) +#define MI_SEMAPHORE_SAD_EQ_SDD (4 << 12) +#define MI_SEMAPHORE_SAD_NEQ_SDD (5 << 12) #define MI_STORE_DWORD_IMM MI_INSTR(0x20, 1) #define MI_STORE_DWORD_IMM_GEN4 MI_INSTR(0x20, 2) #define MI_MEM_VIRTUAL (1 << 22) /* 945,g33,965 */ diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 3fd0c45a2920..6c9479acb433 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -2330,6 +2330,7 @@ void intel_execlists_set_default_submission(struct intel_engine_cs *engine) engine->park = NULL; engine->unpark = NULL; + engine->flags |= I915_ENGINE_HAS_SEMAPHORES; engine->flags |= I915_ENGINE_SUPPORTS_STATS; if (engine->i915->preempt_context) engine->flags |= I915_ENGINE_HAS_PREEMPTION; diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index b8ec7e40a59b..2e7264119ec4 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -499,6 +499,7 @@ 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) +#define I915_ENGINE_HAS_SEMAPHORES BIT(3) unsigned int flags; /* @@ -576,6 +577,12 @@ intel_engine_has_preemption(const struct intel_engine_cs *engine) return engine->flags & I915_ENGINE_HAS_PREEMPTION; } +static inline bool +intel_engine_has_semaphores(const struct intel_engine_cs *engine) +{ + return engine->flags & I915_ENGINE_HAS_SEMAPHORES; +} + void intel_engines_set_scheduler_caps(struct drm_i915_private *i915); static inline bool __execlists_need_preempt(int prio, int last) |