From patchwork Fri Jun 1 09:35:50 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10442895 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 BEEE4602BC for ; Fri, 1 Jun 2018 09:36:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BA4F628F91 for ; Fri, 1 Jun 2018 09:36:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AEE2D28F95; Fri, 1 Jun 2018 09:36:09 +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 712BB28F91 for ; Fri, 1 Jun 2018 09:36:09 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id AA10E6E5DD; Fri, 1 Jun 2018 09:36:08 +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 AFEC26E5D8 for ; Fri, 1 Jun 2018 09:36:06 +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 11909123-1500050 for multiple; Fri, 01 Jun 2018 10:35:57 +0100 Received: by haswell.alporthouse.com (sSMTP sendmail emulation); Fri, 01 Jun 2018 10:35:56 +0100 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Fri, 1 Jun 2018 10:35:50 +0100 Message-Id: <20180601093554.13083-2-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180601093554.13083-1-chris@chris-wilson.co.uk> References: <20180601093554.13083-1-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 2/6] drm/i915/gtt: Don't restore the non-existent PDE for GGTT 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 resume, we have to rewrite all the PDE entries for gen7 ppgtts. If we switch on full-ppgtt, there is then one address space with no PDE, the GGTT. Currently under aliasing-ppgtt, the GGTT address space does have an associated ppgtt and so the restore works just fine. We would have a similar problem if we tried disabling aliasing-ppgtt (i915.enable_ppgtt=0). So skip the empty ppgtt, as being non-existent it doesn't need restoring. Signed-off-by: Chris Wilson Cc: Joonas Lahtinen Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/i915_gem_gtt.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 344b572d0721..992efe1881c8 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -3665,6 +3665,8 @@ void i915_gem_restore_gtt_mappings(struct drm_i915_private *dev_priv) ppgtt = dev_priv->mm.aliasing_ppgtt; else ppgtt = i915_vm_to_ppgtt(vm); + if (!ppgtt) + continue; gen6_write_page_range(ppgtt, 0, ppgtt->base.total); }