From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0BCADC54E90 for ; Mon, 11 May 2020 07:58:15 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D6A6820735 for ; Mon, 11 May 2020 07:58:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D6A6820735 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=chris-wilson.co.uk Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 3E6196E28E; Mon, 11 May 2020 07:58:05 +0000 (UTC) Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id E59E46E252 for ; Mon, 11 May 2020 07:57:58 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from build.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 21160788-1500050 for multiple; Mon, 11 May 2020 08:57:25 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Mon, 11 May 2020 08:57:06 +0100 Message-Id: <20200511075722.13483-4-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200511075722.13483-1-chris@chris-wilson.co.uk> References: <20200511075722.13483-1-chris@chris-wilson.co.uk> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 04/20] drm/i915: Mark the addition of the initial-breadcrumb in the request X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Chris Wilson Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" The initial-breadcrumb is used to mark the end of the awaiting and the beginning of the user payload. We verify that we do not start the user payload before all signaler are completed, checking our semaphore setup by looking for the initial breadcrumb being written too early. We also want to ensure that we do not add semaphore waits after we have already closed the semaphore section, an issue for later deferred waits. Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/gt/intel_lrc.c | 5 ++++- drivers/gpu/drm/i915/i915_request.c | 7 ++++++- drivers/gpu/drm/i915/i915_request.h | 27 ++++++++++++++++++++------- 3 files changed, 30 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index c5591248dafb..f93f13d20b5a 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1894,7 +1894,7 @@ static void defer_request(struct i915_request *rq, struct list_head * const pl) continue; /* No waiter should start before its signaler */ - GEM_BUG_ON(w->context->timeline->has_initial_breadcrumb && + GEM_BUG_ON(i915_request_has_initial_breadcrumb(w) && i915_request_started(w) && !i915_request_completed(rq)); @@ -3501,6 +3501,7 @@ static int gen8_emit_init_breadcrumb(struct i915_request *rq) { u32 *cs; + GEM_BUG_ON(i915_request_has_initial_breadcrumb(rq)); if (!i915_request_timeline(rq)->has_initial_breadcrumb) return 0; @@ -3527,6 +3528,8 @@ static int gen8_emit_init_breadcrumb(struct i915_request *rq) /* Record the updated position of the request's payload */ rq->infix = intel_ring_offset(rq, cs); + __set_bit(I915_FENCE_FLAG_INITIAL_BREADCRUMB, &rq->fence.flags); + return 0; } diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c index 2d5b98549ddc..00b7c4eb3f32 100644 --- a/drivers/gpu/drm/i915/i915_request.c +++ b/drivers/gpu/drm/i915/i915_request.c @@ -951,6 +951,7 @@ __emit_semaphore_wait(struct i915_request *to, u32 *cs; GEM_BUG_ON(INTEL_GEN(to->i915) < 8); + GEM_BUG_ON(i915_request_has_initial_breadcrumb(to)); /* We need to pin the signaler's HWSP until we are finished reading. */ err = intel_timeline_read_hwsp(from, to, &hwsp_offset); @@ -1000,6 +1001,9 @@ emit_semaphore_wait(struct i915_request *to, if (!intel_context_use_semaphores(to->context)) goto await_fence; + if (i915_request_has_initial_breadcrumb(to)) + goto await_fence; + if (!rcu_access_pointer(from->hwsp_cacheline)) goto await_fence; @@ -1256,7 +1260,8 @@ __i915_request_await_execution(struct i915_request *to, * immediate execution, and so we must wait until it reaches the * active slot. */ - if (intel_engine_has_semaphores(to->engine)) { + if (intel_engine_has_semaphores(to->engine) && + !i915_request_has_initial_breadcrumb(to)) { err = __emit_semaphore_wait(to, from, from->fence.seqno - 1); if (err < 0) return err; diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h index d8ce908e1346..98ae2dc82371 100644 --- a/drivers/gpu/drm/i915/i915_request.h +++ b/drivers/gpu/drm/i915/i915_request.h @@ -84,19 +84,26 @@ enum { I915_FENCE_FLAG_PQUEUE, /* - * I915_FENCE_FLAG_SIGNAL - this request is currently on signal_list + * I915_FENCE_FLAG_HOLD - this request is currently on hold * - * Internal bookkeeping used by the breadcrumb code to track when - * a request is on the various signal_list. + * This request has been suspended, pending an ongoing investigation. */ - I915_FENCE_FLAG_SIGNAL, + I915_FENCE_FLAG_HOLD, /* - * I915_FENCE_FLAG_HOLD - this request is currently on hold + * I915_FENCE_FLAG_INITIAL_BREADCRUMB - this request has the initial + * breadcrumb that marks the end of semaphore waits and start of the + * user payload. + */ + I915_FENCE_FLAG_INITIAL_BREADCRUMB, + + /* + * I915_FENCE_FLAG_SIGNAL - this request is currently on signal_list * - * This request has been suspended, pending an ongoing investigation. + * Internal bookkeeping used by the breadcrumb code to track when + * a request is on the various signal_list. */ - I915_FENCE_FLAG_HOLD, + I915_FENCE_FLAG_SIGNAL, /* * I915_FENCE_FLAG_NOPREEMPT - this request should not be preempted @@ -390,6 +397,12 @@ static inline bool i915_request_in_priority_queue(const struct i915_request *rq) return test_bit(I915_FENCE_FLAG_PQUEUE, &rq->fence.flags); } +static inline bool +i915_request_has_initial_breadcrumb(const struct i915_request *rq) +{ + return test_bit(I915_FENCE_FLAG_INITIAL_BREADCRUMB, &rq->fence.flags); +} + /** * Returns true if seq1 is later than seq2. */ -- 2.20.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx