From patchwork Fri Jun 8 17:25:21 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10454863 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1BB176037F for ; Fri, 8 Jun 2018 17:25:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1362D1FF83 for ; Fri, 8 Jun 2018 17:25:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0781A27CEA; Fri, 8 Jun 2018 17:25:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 861C61FF83 for ; Fri, 8 Jun 2018 17:25:40 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 935446E1A8; Fri, 8 Jun 2018 17:25:39 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 910F16E1A8 for ; Fri, 8 Jun 2018 17:25:37 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 11990517-1500050 for multiple; Fri, 08 Jun 2018 18:25:22 +0100 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Fri, 08 Jun 2018 18:25:22 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Fri, 8 Jun 2018 18:25:21 +0100 Message-Id: <20180608172521.21417-1-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.17.1 X-Originating-IP: 78.156.65.138 X-Country: code=GB country="United Kingdom" ip=78.156.65.138 Subject: [Intel-gfx] [PATCH] drm/i915: Wrap around the tail offset before setting ring->tail X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 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-Virus-Scanned: ClamAV using ClamSMTP The HW only accepts offsets within ring->size, and fails peculiarly if the RING_HEAD or RING_TAIL is set to ring->size. Therefore whenever we set ring->head/ring->tail we want to make sure it is within value (using intel_ring_wrap()). Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Cc: Mika Kuoppala Cc: Matthew Auld Cc: Tvrtko Ursulin --- drivers/gpu/drm/i915/intel_ringbuffer.c | 5 +++++ drivers/gpu/drm/i915/intel_ringbuffer.h | 12 ++++++++++++ 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 6ac3b65373fe..9fac0e0f078e 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -496,6 +496,10 @@ static int init_ring_common(struct intel_engine_cs *engine) DRM_DEBUG_DRIVER("%s initialization failed [head=%08x], fudging\n", engine->name, I915_READ_HEAD(engine)); + /* Check that the ring offsets point within the ring! */ + GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->head)); + GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail)); + intel_ring_update_space(ring); I915_WRITE_HEAD(engine, ring->head); I915_WRITE_TAIL(engine, ring->tail); @@ -1064,6 +1068,7 @@ int intel_ring_pin(struct intel_ring *ring, void intel_ring_reset(struct intel_ring *ring, u32 tail) { + tail = intel_ring_wrap(ring, tail); ring->tail = tail; ring->head = tail; ring->emit = tail; diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index b44c67849749..1d8140ac2016 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -805,6 +805,18 @@ static inline u32 intel_ring_wrap(const struct intel_ring *ring, u32 pos) return pos & (ring->size - 1); } +static inline bool +intel_ring_offset_valid(const struct intel_ring *ring, u32 pos) +{ + if (pos & -ring->size) /* must be strictly within the ring */ + return false; + + if (!IS_ALIGNED(pos, 8)) /* must be qword aligned */ + return false; + + return true; +} + static inline u32 intel_ring_offset(const struct i915_request *rq, void *addr) { /* Don't write ring->size (equivalent to 0) as that hangs some GPUs. */