From patchwork Thu Oct 30 18:41:19 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Harrison X-Patchwork-Id: 5199821 Return-Path: X-Original-To: patchwork-intel-gfx@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 08A239F30B for ; Thu, 30 Oct 2014 18:42:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2B7452021B for ; Thu, 30 Oct 2014 18:42:02 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) by mail.kernel.org (Postfix) with ESMTP id 3FAED201DD for ; Thu, 30 Oct 2014 18:42:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B9E456E0D1; Thu, 30 Oct 2014 11:42:00 -0700 (PDT) X-Original-To: Intel-GFX@lists.freedesktop.org Delivered-To: Intel-GFX@lists.freedesktop.org Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by gabe.freedesktop.org (Postfix) with ESMTP id DEE216E5BF for ; Thu, 30 Oct 2014 11:41:55 -0700 (PDT) Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga101.fm.intel.com with ESMTP; 30 Oct 2014 11:41:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,287,1413270000"; d="scan'208";a="623664530" Received: from johnharr-linux.isw.intel.com ([10.102.226.51]) by fmsmga002.fm.intel.com with ESMTP; 30 Oct 2014 11:41:54 -0700 From: John.C.Harrison@Intel.com To: Intel-GFX@Lists.FreeDesktop.Org Date: Thu, 30 Oct 2014 18:41:19 +0000 Message-Id: <1414694481-15724-28-git-send-email-John.C.Harrison@Intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1414694481-15724-1-git-send-email-John.C.Harrison@Intel.com> References: <1414694481-15724-1-git-send-email-John.C.Harrison@Intel.com> Organization: Intel Corporation (UK) Ltd. - Co. Reg. #1134945 - Pipers Way, Swindon SN3 1RJ Subject: [Intel-gfx] [PATCH 27/29] drm/i915: Interrupt driven request completion X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Spam-Status: No, score=-4.8 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: John Harrison Added a hook to the ring noftification code to process request completion. This means that there is no longer a need to explicitly process request completions every time a request object is tested. Instead, the test code simply becomes 'return req->completed'. Obviously, this only works if ring interrupts are enabled, however, this is already the case for the duration of __wait_request() which is the point where the driver really needs to know. To prevent stale requests floating around indefinitely, the retire work handler also now performs a completion check periodically. For: VIZ-4377 Signed-off-by: John Harrison --- drivers/gpu/drm/i915/i915_drv.h | 5 ----- drivers/gpu/drm/i915/i915_gem.c | 10 ++++++++++ drivers/gpu/drm/i915/i915_irq.c | 2 ++ 3 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 1a3db6f..ab89fd5 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -2007,11 +2007,6 @@ static inline void i915_gem_request_assign(struct drm_i915_gem_request **pdst, static inline bool i915_gem_request_completed(struct drm_i915_gem_request *req, bool lazy_coherency) { - if (req->complete) - return true; - - i915_gem_complete_requests_ring(req->ring, lazy_coherency); - return req->complete; } diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index c4facbd..98052e6 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1183,6 +1183,11 @@ static int __wait_request(struct drm_i915_gem_request *req, if (!irq_test_in_progress && WARN_ON(!ring->irq_get(ring))) return -ENODEV; + /* Completion status should be interrupt driven but it is possible + * the request popped out before the interrupt was enabled. So do an + * explicit check now... */ + i915_gem_complete_requests_ring(req->ring, false); + /* Record current time in case interrupted by signal, or wedged */ trace_i915_gem_request_wait_begin(req); before = ktime_get_raw_ns(); @@ -2405,6 +2410,10 @@ int __i915_add_request(struct intel_engine_cs *ring, list_add_tail(&request->list, &ring->request_list); request->file_priv = NULL; + /* Avoid race condition where the request completes before it has + * been added to the list. */ + ring->last_read_seqno = 0; + if (file) { struct drm_i915_file_private *file_priv = file->driver_priv; @@ -2768,6 +2777,7 @@ i915_gem_retire_requests(struct drm_device *dev) int i; for_each_ring(ring, dev_priv, i) { + i915_gem_complete_requests_ring(ring, false); i915_gem_retire_requests_ring(ring); idle &= list_empty(&ring->request_list); } diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 21e1d69..1f8f708 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -979,6 +979,8 @@ static void notify_ring(struct drm_device *dev, trace_i915_gem_request_complete(ring); + i915_gem_complete_requests_ring(ring, false); + if (drm_core_check_feature(dev, DRIVER_MODESET)) intel_notify_mmio_flip(ring);