From patchwork Mon Sep 13 18:05:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Matthew Auld X-Patchwork-Id: 12490461 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 5F882C433FE for ; Mon, 13 Sep 2021 18:08:20 +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 289E4610D1 for ; Mon, 13 Sep 2021 18:08:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 289E4610D1 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 125AB6E21A; Mon, 13 Sep 2021 18:08:16 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id 423386E216; Mon, 13 Sep 2021 18:08:15 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10106"; a="221792512" X-IronPort-AV: E=Sophos;i="5.85,290,1624345200"; d="scan'208";a="221792512" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2021 11:08:15 -0700 X-IronPort-AV: E=Sophos;i="5.85,290,1624345200"; d="scan'208";a="551796973" Received: from jpcooney-mobl1.ger.corp.intel.com (HELO mwauld-desk1.intel.com) ([10.252.5.201]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Sep 2021 11:08:13 -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 2/8] drm/ttm: add TTM_PAGE_FLAG_SHMEM Date: Mon, 13 Sep 2021 19:05:59 +0100 Message-Id: <20210913180605.2778493-2-matthew.auld@intel.com> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210913180605.2778493-1-matthew.auld@intel.com> References: <20210913180605.2778493-1-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" Add new flag to indicate special shmem based tt, which can directly handle swapping itself, and should be visible to some shrinker. As part of this we should skip the ttm_pages_allocated accounting, since such tt objects should already be reachable, and potentially reclaimable by some shrinker, if under memory pressure, and so shouldn't directly count towards the swap "watermark" level. We also need to stop touching the page->mapping and page->index for such objects, like in ttm_tt_add_mapping, since shmem already uses these. Some drivers seems to depend on the tt mapping/index behaviour for their own purposes, so directly using shmem tt likely won't be usable there as-is. Signed-off-by: Matthew Auld Cc: Thomas Hellström Cc: Christian König --- drivers/gpu/drm/ttm/ttm_bo_vm.c | 4 ++-- drivers/gpu/drm/ttm/ttm_tt.c | 10 +++++----- include/drm/ttm/ttm_tt.h | 1 + 3 files changed, 8 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c index f56be5bc0861..e2131c73dcb6 100644 --- a/drivers/gpu/drm/ttm/ttm_bo_vm.c +++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c @@ -346,8 +346,8 @@ 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; + if (!(bo->ttm->page_flags & TTM_PAGE_FLAG_SHMEM)) + 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..cc4815c1f505 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -293,7 +293,7 @@ static void ttm_tt_add_mapping(struct ttm_device *bdev, struct ttm_tt *ttm) { pgoff_t i; - if (ttm->page_flags & TTM_PAGE_FLAG_SG) + if (ttm->page_flags & (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SHMEM)) return; for (i = 0; i < ttm->num_pages; ++i) @@ -311,7 +311,7 @@ int ttm_tt_populate(struct ttm_device *bdev, if (ttm_tt_is_populated(ttm)) return 0; - if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) { + if (!(ttm->page_flags & (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SHMEM))) { atomic_long_add(ttm->num_pages, &ttm_pages_allocated); if (bdev->pool.use_dma32) atomic_long_add(ttm->num_pages, @@ -349,7 +349,7 @@ int ttm_tt_populate(struct ttm_device *bdev, return 0; error: - if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) { + if (!(ttm->page_flags & (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SHMEM))) { atomic_long_sub(ttm->num_pages, &ttm_pages_allocated); if (bdev->pool.use_dma32) atomic_long_sub(ttm->num_pages, @@ -364,7 +364,7 @@ static void ttm_tt_clear_mapping(struct ttm_tt *ttm) pgoff_t i; struct page **page = ttm->pages; - if (ttm->page_flags & TTM_PAGE_FLAG_SG) + if (ttm->page_flags & (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SHMEM)) return; for (i = 0; i < ttm->num_pages; ++i) { @@ -384,7 +384,7 @@ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm) else ttm_pool_free(&bdev->pool, ttm); - if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) { + if (!(ttm->page_flags & (TTM_PAGE_FLAG_SG | TTM_PAGE_FLAG_SHMEM))) { atomic_long_sub(ttm->num_pages, &ttm_pages_allocated); if (bdev->pool.use_dma32) atomic_long_sub(ttm->num_pages, diff --git a/include/drm/ttm/ttm_tt.h b/include/drm/ttm/ttm_tt.h index 89b15d673b22..20d550185065 100644 --- a/include/drm/ttm/ttm_tt.h +++ b/include/drm/ttm/ttm_tt.h @@ -42,6 +42,7 @@ struct ttm_operation_ctx; #define TTM_PAGE_FLAG_ZERO_ALLOC (1 << 6) #define TTM_PAGE_FLAG_SG (1 << 8) #define TTM_PAGE_FLAG_NO_RETRY (1 << 9) +#define TTM_PAGE_FLAG_SHMEM (1 << 10) #define TTM_PAGE_FLAG_PRIV_POPULATED (1 << 31)