From patchwork Thu May 31 11:35:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10440941 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 0F4C4602BD for ; Thu, 31 May 2018 11:37:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F2CED2921A for ; Thu, 31 May 2018 11:37:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E7A92292E7; Thu, 31 May 2018 11:37:47 +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 A22762921A for ; Thu, 31 May 2018 11:37:47 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2D5486E2DA; Thu, 31 May 2018 11:37:47 +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 D93296E2DA for ; Thu, 31 May 2018 11:37:45 +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 11899111-1500050 for multiple; Thu, 31 May 2018 12:36:03 +0100 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Thu, 31 May 2018 12:36:02 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Thu, 31 May 2018 12:35:52 +0100 Message-Id: <20180531113552.13152-5-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180531113552.13152-1-chris@chris-wilson.co.uk> References: <20180531113552.13152-1-chris@chris-wilson.co.uk> X-Originating-IP: 78.156.65.138 X-Country: code=GB country="United Kingdom" ip=78.156.65.138 Subject: [Intel-gfx] [PATCH 5/5] drm/i915/userptr: Enable read-only support on gen8+ 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 On gen8 and onwards, we can mark GPU accesses through the ppGTT as being read-only, that is cause any GPU write onto that page to be discarded (not triggering a fault). This is all that we need to finally support the read-only flag for userptr! Testcase: igt/gem_userptr_blits/readonly* Signed-off-by: Chris Wilson Cc: Jon Bloomfield Cc: Joonas Lahtinen Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem_userptr.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c index 854bd51b9478..d4ee8fa4c379 100644 --- a/drivers/gpu/drm/i915/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c @@ -789,10 +789,12 @@ i915_gem_userptr_ioctl(struct drm_device *dev, return -EFAULT; if (args->flags & I915_USERPTR_READ_ONLY) { - /* On almost all of the current hw, we cannot tell the GPU that a - * page is readonly, so this is just a placeholder in the uAPI. + /* + * On almost all of the older hw, we cannot tell the GPU that + * a page is readonly. */ - return -ENODEV; + if (INTEL_GEN(dev_priv) < 8 || !USES_PPGTT(dev_priv)) + return -ENODEV; } obj = i915_gem_object_alloc(dev_priv); @@ -806,7 +808,10 @@ i915_gem_userptr_ioctl(struct drm_device *dev, i915_gem_object_set_cache_coherency(obj, I915_CACHE_LLC); obj->userptr.ptr = args->user_ptr; - obj->userptr.read_only = !!(args->flags & I915_USERPTR_READ_ONLY); + if (args->flags & I915_USERPTR_READ_ONLY) { + obj->userptr.read_only = true; + obj->gt_ro = true; + } /* And keep a pointer to the current->mm for resolving the user pages * at binding. This means that we need to hook into the mmu_notifier