From patchwork Wed Sep 15 18:59:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Matthew Auld X-Patchwork-Id: 12497261 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=-16.7 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=unavailable 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 CB5C1C433F5 for ; Wed, 15 Sep 2021 19:01:04 +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 9E96261029 for ; Wed, 15 Sep 2021 19:01:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9E96261029 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=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 6A4FB6E9F1; Wed, 15 Sep 2021 19:00:33 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id E08886E9E2; Wed, 15 Sep 2021 19:00:25 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10108"; a="286094792" X-IronPort-AV: E=Sophos;i="5.85,296,1624345200"; d="scan'208";a="286094792" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2021 12:00:25 -0700 X-IronPort-AV: E=Sophos;i="5.85,296,1624345200"; d="scan'208";a="553461037" Received: from rdignam-mobl1.ger.corp.intel.com (HELO mwauld-desk1.intel.com) ([10.252.31.110]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Sep 2021 12:00:24 -0700 From: Matthew Auld To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org, =?utf-8?q?Thomas_Hellstr=C3=B6m?= , =?utf-8?q?Christian_K=C3=B6nig?= Subject: [PATCH v3 06/12] drm/ttm: add TTM_PAGE_FLAG_EXTERNAL_MAPPABLE Date: Wed, 15 Sep 2021 19:59:48 +0100 Message-Id: <20210915185954.3114858-6-matthew.auld@intel.com> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210915185954.3114858-1-matthew.auld@intel.com> References: <20210915185954.3114858-1-matthew.auld@intel.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" In commit: commit 667a50db0477d47fdff01c666f5ee1ce26b5264c Author: Thomas Hellstrom Date: Fri Jan 3 11:17:18 2014 +0100 drm/ttm: Refuse to fault (prime-) imported pages we introduced the restriction that imported pages should not be directly mappable through TTM(this also extends to userptr). In the next patch we want to introduce a shmem_tt backend, which should follow all the existing rules with TTM_PAGE_FLAG_EXTERNAL, since it will need to handle swapping itself, but with the above mapping restriction lifted. Signed-off-by: Matthew Auld Cc: Thomas Hellström Cc: Christian König --- drivers/gpu/drm/ttm/ttm_bo_vm.c | 6 ++++-- include/drm/ttm/ttm_tt.h | 7 +++++++ 2 files changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index 708390588c7c..fd6e18f12f50 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -163,8 +163,10 @@ vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo, * (if at all) by redirecting mmap to the exporter. */ if (bo->ttm && (bo->ttm->page_flags & TTM_PAGE_FLAG_EXTERNAL)) { - dma_resv_unlock(bo->base.resv); - return VM_FAULT_SIGBUS; + if (!(bo->ttm->page_flags & TTM_PAGE_FLAG_EXTERNAL_MAPPABLE)) { + dma_resv_unlock(bo->base.resv); + return VM_FAULT_SIGBUS; + } } return 0; diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h index 7f54a83c95ef..800c9edb3e10 100644 --- a/include/drm/ttm/ttm_tt.h +++ b/include/drm/ttm/ttm_tt.h @@ -66,11 +66,18 @@ struct ttm_tt { * Note that enum ttm_bo_type.ttm_bo_type_sg objects will always enable * this flag. * + * TTM_PAGE_FLAG_EXTERNAL_MAPPABLE: Same behaviour as + * TTM_PAGE_FLAG_EXTERNAL, but with the reduced restriction that it is + * still valid to use TTM to map the pages directly. This is useful when + * implementing a ttm_tt backend which still allocates driver owned + * pages underneath(say with shmem). + * * TTM_PAGE_FLAG_PRIV_POPULATED: TTM internal only. DO NOT USE. */ #define TTM_PAGE_FLAG_SWAPPED (1 << 0) #define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 1) #define TTM_PAGE_FLAG_EXTERNAL (1 << 2) +#define TTM_PAGE_FLAG_EXTERNAL_MAPPABLE (1 << 3 | TTM_PAGE_FLAG_EXTERNAL) #define TTM_PAGE_FLAG_PRIV_POPULATED (1 << 31) uint32_t page_flags;