diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_request.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_request.c | 69 |
1 files changed, 57 insertions, 12 deletions
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index e9c2094ab8ea..b836721d3b13 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -29,10 +29,11 @@ #include <linux/sched/clock.h> #include <linux/sched/signal.h> -#include "i915_drv.h" #include "i915_active.h" +#include "i915_drv.h" #include "i915_globals.h" #include "i915_reset.h" +#include "intel_pm.h" struct execute_cb { struct list_head link; @@ -100,6 +101,7 @@ static void i915_fence_release(struct dma_fence *fence) * caught trying to reuse dead objects. */ i915_sw_fence_fini(&rq->submit); + i915_sw_fence_fini(&rq->semaphore); kmem_cache_free(global.slab_requests, rq); } @@ -551,6 +553,36 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) return NOTIFY_DONE; } +static int __i915_sw_fence_call +semaphore_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state) +{ + struct i915_request *request = + container_of(fence, typeof(*request), semaphore); + + switch (state) { + case FENCE_COMPLETE: + /* + * We only check a small portion of our dependencies + * and so cannot guarantee that there remains no + * semaphore chain across all. Instead of opting + * for the full NOSEMAPHORE boost, we go for the + * smaller (but still preempting) boost of + * NEWCLIENT. This will be enough to boost over + * a busywaiting request (as that cannot be + * NEWCLIENT) without accidentally boosting + * a busywait over real work elsewhere. + */ + i915_schedule_bump_priority(request, I915_PRIORITY_NEWCLIENT); + break; + + case FENCE_FREE: + i915_request_put(request); + break; + } + + return NOTIFY_DONE; +} + static void ring_retire_requests(struct intel_ring *ring) { struct i915_request *rq, *rn; @@ -583,11 +615,6 @@ out: return kmem_cache_alloc(global.slab_requests, GFP_KERNEL); } -static int add_timeline_barrier(struct i915_request *rq) -{ - return i915_request_await_active_request(rq, &rq->timeline->barrier); -} - /** * i915_request_alloc - allocate a request structure * @@ -706,6 +733,7 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx) /* We bump the ref for the fence chain */ i915_sw_fence_init(&i915_request_get(rq)->submit, submit_notify); + i915_sw_fence_init(&i915_request_get(rq)->semaphore, semaphore_notify); i915_sched_node_init(&rq->sched); @@ -737,10 +765,6 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx) */ rq->head = rq->ring->emit; - ret = add_timeline_barrier(rq); - if (ret) - goto err_unwind; - ret = engine->request_alloc(rq); if (ret) goto err_unwind; @@ -751,7 +775,10 @@ i915_request_alloc(struct intel_engine_cs *engine, struct i915_gem_context *ctx) rq->infix = rq->ring->emit; /* end of header; start of user payload */ /* Check that we didn't interrupt ourselves with a new request */ + lockdep_assert_held(&rq->timeline->mutex); GEM_BUG_ON(rq->timeline->seqno != rq->fence.seqno); + rq->cookie = lockdep_pin_lock(&rq->timeline->mutex); + return rq; err_unwind: @@ -783,6 +810,18 @@ emit_semaphore_wait(struct i915_request *to, GEM_BUG_ON(!from->timeline->has_initial_breadcrumb); GEM_BUG_ON(INTEL_GEN(to->i915) < 8); + /* Just emit the first semaphore we see as request space is limited. */ + if (to->sched.semaphores & from->engine->mask) + return i915_sw_fence_await_dma_fence(&to->submit, + &from->fence, 0, + I915_FENCE_GFP); + + err = i915_sw_fence_await_dma_fence(&to->semaphore, + &from->fence, 0, + I915_FENCE_GFP); + if (err < 0) + return err; + /* We need to pin the signaler's HWSP until we are finished reading. */ err = i915_timeline_read_hwsp(from, to, &hwsp_offset); if (err) @@ -814,7 +853,8 @@ emit_semaphore_wait(struct i915_request *to, *cs++ = 0; intel_ring_advance(to, cs); - to->sched.flags |= I915_SCHED_HAS_SEMAPHORE; + to->sched.semaphores |= from->engine->mask; + to->sched.flags |= I915_SCHED_HAS_SEMAPHORE_CHAIN; return 0; } @@ -1063,6 +1103,8 @@ void i915_request_add(struct i915_request *request) engine->name, request->fence.context, request->fence.seqno); lockdep_assert_held(&request->timeline->mutex); + lockdep_unpin_lock(&request->timeline->mutex, request->cookie); + trace_i915_request_add(request); /* @@ -1110,6 +1152,7 @@ void i915_request_add(struct i915_request *request) * run at the earliest possible convenience. */ local_bh_disable(); + i915_sw_fence_commit(&request->semaphore); rcu_read_lock(); /* RCU serialisation for set-wedged protection */ if (engine->schedule) { struct i915_sched_attr attr = request->gem_context->sched; @@ -1126,7 +1169,7 @@ void i915_request_add(struct i915_request *request) * far in the distance past over useful work, we keep a history * of any semaphore use along our dependency chain. */ - if (!(request->sched.flags & I915_SCHED_HAS_SEMAPHORE)) + if (!(request->sched.flags & I915_SCHED_HAS_SEMAPHORE_CHAIN)) attr.priority |= I915_PRIORITY_NOSEMAPHORE; /* @@ -1316,7 +1359,9 @@ long i915_request_wait(struct i915_request *rq, if (flags & I915_WAIT_PRIORITY) { if (!i915_request_started(rq) && INTEL_GEN(rq->i915) >= 6) gen6_rps_boost(rq); + local_bh_disable(); /* suspend tasklets for reprioritisation */ i915_schedule_bump_priority(rq, I915_PRIORITY_WAIT); + local_bh_enable(); /* kick tasklets en masse */ } wait.tsk = current; |