From patchwork Wed Sep 15 18:59:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Matthew Auld X-Patchwork-Id: 12497247 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 0CE58C433EF for ; Wed, 15 Sep 2021 19:00:25 +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 C921161029 for ; Wed, 15 Sep 2021 19:00:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C921161029 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 6DB006E9DD; Wed, 15 Sep 2021 19:00:20 +0000 (UTC) Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by gabe.freedesktop.org (Postfix) with ESMTPS id 2FF8E6E9DC; Wed, 15 Sep 2021 19:00:19 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10108"; a="286094761" X-IronPort-AV: E=Sophos;i="5.85,296,1624345200"; d="scan'208";a="286094761" 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 12:00:18 -0700 X-IronPort-AV: E=Sophos;i="5.85,296,1624345200"; d="scan'208";a="553460887" 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 12:00:16 -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 01/12] drm/ttm: stop setting page->index for the ttm_tt Date: Wed, 15 Sep 2021 19:59:43 +0100 Message-Id: <20210915185954.3114858-1-matthew.auld@intel.com> X-Mailer: git-send-email 2.26.3 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 58aa6622d32af7d2c08d45085f44c54554a16ed7 Author: Thomas Hellstrom Date: Fri Jan 3 11:47:23 2014 +0100 drm/ttm: Correctly set page mapping and -index members we started setting the page->mapping and page->index to point to the virtual address space, if the pages were faulted with TTM. Apparently this was needed for core-mm to able to reverse lookup the virtual address given the struct page, and potentially unmap it from the page tables. However as pointed out by Thomas, since we are now using PFN_MAP, instead of say PFN_MIXED, this should no longer be the case. There was also apparently some usecase in vmwgfx which needed this for dirty tracking, but that also doesn't appear to be the case anymore, as pointed out by Thomas. We still need keep the page->mapping for now, since that is still needed for different reasons, but we try to address that in the next patch. Signed-off-by: Matthew Auld Cc: Thomas Hellström Cc: Christian König Reviewed-by: Christian König --- drivers/gpu/drm/ttm/ttm_bo_vm.c | 2 -- drivers/gpu/drm/ttm/ttm_tt.c | 4 +--- 2 files changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index f56be5bc0861..906ec8a1bf5a 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -346,8 +346,6 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf, } else if (unlikely(!page)) { break; } - page->index = drm_vma_node_start(&bo->base.vma_node) + - page_offset; pfn = page_to_pfn(page); } diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index dae52433beeb..1cc04c224988 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -367,10 +367,8 @@ static void ttm_tt_clear_mapping(struct ttm_tt *ttm) if (ttm->page_flags & TTM_PAGE_FLAG_SG) return; - for (i = 0; i < ttm->num_pages; ++i) { + for (i = 0; i < ttm->num_pages; ++i) (*page)->mapping = NULL; - (*page++)->index = 0; - } } void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm)