From: Daniele Ceraolo Spurio Date: Mon, 12 Aug 2019 23:31:50 +0000 (-0700) Subject: drm/i915/guc: keep breadcrumb irq always enabled X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ee94e0c4598a34ccbb2927af5700e373e5f96f23;p=linux.git drm/i915/guc: keep breadcrumb irq always enabled We rely on the tasklet to update the GT PM refcount, so we can't disable it even if we've processed all the requests for the engine because we might have detected the request completion before the interrupt arrived. Since on all platforms on which we plan to support guc submission we don't allow disabling the breadcrumb interrupts, we can further siplify the park/unpark flow by removing the interrupt pin/unpin. A BUG_ON has been added to catch changes to this flow that would require us to restore some kind of pinning. v2: split removal of engine_pin/unpin_breadcrumbs_irq to its own patch (chris) Signed-off-by: Daniele Ceraolo Spurio Cc: Chris Wilson Cc: Michal Wajdeczko Reviewed-by: Chris Wilson Signed-off-by: Chris Wilson Link: https://patchwork.freedesktop.org/patch/msgid/20190812233152.2172-1-daniele.ceraolospurio@intel.com --- 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 449ca63570184..deb054eeb37c4 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c @@ -1059,18 +1059,6 @@ static void guc_interrupts_release(struct intel_gt *gt) rps->pm_intrmsk_mbz &= ~ARAT_EXPIRED_INTRMSK; } -static void guc_submission_park(struct intel_engine_cs *engine) -{ - intel_engine_unpin_breadcrumbs_irq(engine); - engine->flags &= ~I915_ENGINE_NEEDS_BREADCRUMB_TASKLET; -} - -static void guc_submission_unpark(struct intel_engine_cs *engine) -{ - engine->flags |= I915_ENGINE_NEEDS_BREADCRUMB_TASKLET; - intel_engine_pin_breadcrumbs_irq(engine); -} - static void guc_set_default_submission(struct intel_engine_cs *engine) { /* @@ -1088,8 +1076,8 @@ static void guc_set_default_submission(struct intel_engine_cs *engine) engine->execlists.tasklet.func = guc_submission_tasklet; - engine->park = guc_submission_park; - engine->unpark = guc_submission_unpark; + /* do not use execlists park/unpark */ + engine->park = engine->unpark = NULL; engine->reset.prepare = guc_reset_prepare; engine->reset.reset = guc_reset; @@ -1098,6 +1086,15 @@ static void guc_set_default_submission(struct intel_engine_cs *engine) engine->cancel_requests = guc_cancel_requests; engine->flags &= ~I915_ENGINE_SUPPORTS_STATS; + engine->flags |= I915_ENGINE_NEEDS_BREADCRUMB_TASKLET; + + /* + * For the breadcrumb irq to work we need the interrupts to stay + * enabled. However, on all platforms on which we'll have support for + * GuC submission we don't allow disabling the interrupts at runtime, so + * we're always safe with the current flow. + */ + GEM_BUG_ON(engine->irq_enable || engine->irq_disable); } int intel_guc_submission_enable(struct intel_guc *guc)