From patchwork Mon May 31 17:22:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Hellstr=C3=B6m?= X-Patchwork-Id: 12289727 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 558F0C47080 for ; Mon, 31 May 2021 17:22:49 +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 0D3D2610A8 for ; Mon, 31 May 2021 17:22:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0D3D2610A8 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com 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 CE3516E958; Mon, 31 May 2021 17:22:41 +0000 (UTC) Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by gabe.freedesktop.org (Postfix) with ESMTPS id 8A8CA6E94B; Mon, 31 May 2021 17:22:40 +0000 (UTC) IronPort-SDR: oDQGoZLmmnVU01ecDhZcxY6oqrxhFHP6Ky1XkKv9a9I8TI/7tc50rJRn9x8siMXLWZaSXTZUDl o8Ual8LIAE2w== X-IronPort-AV: E=McAfee;i="6200,9189,10001"; a="201520187" X-IronPort-AV: E=Sophos;i="5.83,237,1616482800"; d="scan'208";a="201520187" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2021 10:22:40 -0700 IronPort-SDR: xhQaA3SXDQjcmNfITzuuTwTGeHjWcVMksH0UeDAv0rTtj87RHKxC/tYnuB3HN1ZXzyr/pSssY6 Td6IMs57Gdew== X-IronPort-AV: E=Sophos;i="5.83,237,1616482800"; d="scan'208";a="416210944" Received: from fnygreen-mobl1.ger.corp.intel.com (HELO thellst-mobl1.intel.com) ([10.249.254.142]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 May 2021 10:22:38 -0700 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Mon, 31 May 2021 19:22:14 +0200 Message-Id: <20210531172228.70846-2-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531172228.70846-1-thomas.hellstrom@linux.intel.com> References: <20210531172228.70846-1-thomas.hellstrom@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v8 01/15] drm/i915: Untangle the vma pages_mutex 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: =?utf-8?q?Thomas_Hellstr=C3=B6m?= Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Any sleeping dma_resv lock taken while the vma pages_mutex is held will cause a lockdep splat. Move the i915_gem_object_pin_pages() call out of the pages_mutex critical section. Signed-off-by: Thomas Hellström Reviewed-by: Maarten Lankhorst --- drivers/gpu/drm/i915/i915_vma.c | 29 +++++++++++++++++------------ 1 file changed, 17 insertions(+), 12 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index b319fd3f91cc..0f227f28b280 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -800,32 +800,37 @@ static bool try_qad_pin(struct i915_vma *vma, unsigned int flags) static int vma_get_pages(struct i915_vma *vma) { int err = 0; + bool pinned_pages = false; if (atomic_add_unless(&vma->pages_count, 1, 0)) return 0; + if (vma->obj) { + err = i915_gem_object_pin_pages(vma->obj); + if (err) + return err; + pinned_pages = true; + } + /* Allocations ahoy! */ - if (mutex_lock_interruptible(&vma->pages_mutex)) - return -EINTR; + if (mutex_lock_interruptible(&vma->pages_mutex)) { + err = -EINTR; + goto unpin; + } if (!atomic_read(&vma->pages_count)) { - if (vma->obj) { - err = i915_gem_object_pin_pages(vma->obj); - if (err) - goto unlock; - } - err = vma->ops->set_pages(vma); - if (err) { - if (vma->obj) - i915_gem_object_unpin_pages(vma->obj); + if (err) goto unlock; - } + pinned_pages = false; } atomic_inc(&vma->pages_count); unlock: mutex_unlock(&vma->pages_mutex); +unpin: + if (pinned_pages) + __i915_gem_object_unpin_pages(vma->obj); return err; }