From patchwork Tue Nov 2 16:34:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 12599293 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3F33FC433EF for ; Tue, 2 Nov 2021 16:39:23 +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 0712C60E90 for ; Tue, 2 Nov 2021 16:39:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0712C60E90 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=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0F3D1731E1; Tue, 2 Nov 2021 16:39:22 +0000 (UTC) Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id DCBD5731DE; Tue, 2 Nov 2021 16:39:20 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10156"; a="231267877" X-IronPort-AV: E=Sophos;i="5.87,203,1631602800"; d="scan'208";a="231267877" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2021 09:34:34 -0700 X-IronPort-AV: E=Sophos;i="5.87,203,1631602800"; d="scan'208";a="531614861" Received: from vanderss-mobl.ger.corp.intel.com (HELO thellstr-mobl1.intel.com) ([10.249.254.234]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2021 09:34:32 -0700 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Tue, 2 Nov 2021 17:34:23 +0100 Message-Id: <20211102163425.505732-1-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v3 0/2] drm/i915: Failsafe migration blits 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?= , matthew.auld@intel.com Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This patch series introduces failsafe migration blits. The reason for this seemingly strange concept is that if the initial clearing or readback of LMEM fails for some reason[1], and we then set up either GPU- or CPU ptes to the allocated LMEM, we can expose old contents from other clients. So after each migration blit to LMEM, attach a dma-fence callback that checks the migration fence error value and if it's an error, performs a memcpy blit, instead. Patch 1 splits out the TTM move code into separate files Patch 2 implements the failsafe blits and related self-tests [1] There are at least two ways we could trigger exposure of uninitialized LMEM assuming the migration blits themselves never trigger a gpu hang. a) A gpu operation preceding a pipelined eviction blit resets and sets the error fence to -EIO, and the error is propagated across the TTM manager to the clear / swapin blit of a newly allocated TTM resource. It aborts and leaves the memory uninitialized. b) Something wedges the GT while a migration blit is submitted. It ends up never executed and TTM can fault user-space cpu-ptes into uninitialized memory. v3: - Style fixes in second patch (Matthew Auld) Thomas Hellström (2): drm/i915/ttm: Reorganize the ttm move code drm/i915/ttm: Failsafe migration blits drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 328 ++--------- drivers/gpu/drm/i915/gem/i915_gem_ttm.h | 35 ++ drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c | 520 ++++++++++++++++++ drivers/gpu/drm/i915/gem/i915_gem_ttm_move.h | 43 ++ .../drm/i915/gem/selftests/i915_gem_migrate.c | 24 +- 6 files changed, 670 insertions(+), 281 deletions(-) create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_ttm_move.h