From patchwork Wed Feb 15 16:13:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Hellstrom X-Patchwork-Id: 13141861 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id E4F3BC636D4 for ; Wed, 15 Feb 2023 16:14:44 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B6BAA10E276; Wed, 15 Feb 2023 16:14:43 +0000 (UTC) Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 38C0D10EACF; Wed, 15 Feb 2023 16:14:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676477681; x=1708013681; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fBC7jBzo37+O/nCkHNJ6G49Az5rw8kNvRLn7CLfn/ts=; b=T3/OqiP3MbeVN3h2OFWdtEtsuvHjJQqxTyYSrDBdPbbPyzOO8w//c4Bj t9R1XCpdrNjw1twsgeuul9GWrWGWsMJMcdP/gwSoNKQHniSP+RNtJCgG1 iP57yEAHpxh4K0nxsa91hIl7IwOZ3yXxCNSNSMAnT48YkafGKiennfgab OfuiGdgDPpEATKjkFGOkvoE6oKCQAfLjWbhRiT6YflhfHcAfywihO6aaa Vg4pq15areggrhhlLbMXvRPZQPyAuEdQvZYLEocH9ibY1NMKriBNyJbYi bNIux8c5BJhKV7MjWhTIbnIdy1RRrYaXZ0afSd4axpUDEm9NX8sZl6RDq g==; X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="393870710" X-IronPort-AV: E=Sophos;i="5.97,300,1669104000"; d="scan'208";a="393870710" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 08:14:40 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10622"; a="758472124" X-IronPort-AV: E=Sophos;i="5.97,300,1669104000"; d="scan'208";a="758472124" Received: from auliel-mobl1.ger.corp.intel.com (HELO thellstr-mobl1.intel.com) ([10.249.254.14]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 08:14:34 -0800 From: =?utf-8?q?Thomas_Hellstr=C3=B6m?= To: dri-devel@lists.freedesktop.org Subject: [RFC PATCH 02/16] drm/ttm/pool: Fix ttm_pool_alloc error path Date: Wed, 15 Feb 2023 17:13:51 +0100 Message-Id: <20230215161405.187368-3-thomas.hellstrom@linux.intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20230215161405.187368-1-thomas.hellstrom@linux.intel.com> References: <20230215161405.187368-1-thomas.hellstrom@linux.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: , Cc: Miaohe Lin , =?utf-8?q?Thomas_Hellstr=C3=B6m?= , David Hildenbrand , NeilBrown , Daniel Vetter , intel-gfx@lists.freedesktop.org, "Matthew Wilcox \(Oracle\)" , linux-mm@kvack.org, Dave Hansen , Huang Rui , linux-graphics-maintainer@vmware.com, Peter Xu , Johannes Weiner , Madhav Chauhan , Dave Airlie , Andrew Morton , =?utf-8?q?Christian_K=C3=B6nig?= , Matthew Auld Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" When hitting an error, the error path forgot to unmap dma mappings and could call set_pages_wb() on already uncached pages. Fix this by introducing a common __ttm_pool_free() function that does the right thing. Fixes: d099fc8f540a ("drm/ttm: new TT backend allocation pool v3") Cc: Christian König Cc: Dave Airlie Cc: Madhav Chauhan Cc: Christian Koenig Cc: Huang Rui Cc: dri-devel@lists.freedesktop.org Signed-off-by: Thomas Hellström --- drivers/gpu/drm/ttm/ttm_pool.c | 74 +++++++++++++++++++++------------- 1 file changed, 45 insertions(+), 29 deletions(-) diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c index aa116a7bbae3..1cc7591a9542 100644 --- a/drivers/gpu/drm/ttm/ttm_pool.c +++ b/drivers/gpu/drm/ttm/ttm_pool.c @@ -367,6 +367,39 @@ static int ttm_pool_page_allocated(struct ttm_pool *pool, unsigned int order, return 0; } +static void __ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt, + struct page **caching_divide, + enum ttm_caching initial_caching, + enum ttm_caching subseq_caching, + pgoff_t num_pages) +{ + enum ttm_caching caching = subseq_caching; + struct page **pages = tt->pages; + unsigned int order; + pgoff_t i, nr; + + if (pool && caching_divide) + caching = initial_caching; + + for (i = 0; i < num_pages; i += nr, pages += nr) { + struct ttm_pool_type *pt = NULL; + + if (unlikely(caching_divide == pages)) + caching = subseq_caching; + + order = ttm_pool_page_order(pool, *pages); + nr = (1UL << order); + if (tt->dma_address) + ttm_pool_unmap(pool, tt->dma_address[i], nr); + + pt = ttm_pool_select_type(pool, caching, order); + if (pt) + ttm_pool_type_give(pt, *pages); + else + ttm_pool_free_page(pool, caching, order, *pages); + } +} + /** * ttm_pool_alloc - Fill a ttm_tt object * @@ -386,8 +419,9 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, dma_addr_t *dma_addr = tt->dma_address; struct page **caching = tt->pages; struct page **pages = tt->pages; + enum ttm_caching page_caching; gfp_t gfp_flags = GFP_USER; - unsigned int i, order; + unsigned int order; struct page *p; int r; @@ -410,6 +444,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, order = min_t(unsigned int, order, __fls(num_pages))) { struct ttm_pool_type *pt; + page_caching = tt->caching; pt = ttm_pool_select_type(pool, tt->caching, order); p = pt ? ttm_pool_type_take(pt) : NULL; if (p) { @@ -418,6 +453,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, if (r) goto error_free_page; + caching = pages; do { r = ttm_pool_page_allocated(pool, order, p, &dma_addr, @@ -426,14 +462,15 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, if (r) goto error_free_page; + caching = pages; if (num_pages < (1 << order)) break; p = ttm_pool_type_take(pt); } while (p); - caching = pages; } + page_caching = ttm_cached; while (num_pages >= (1 << order) && (p = ttm_pool_alloc_page(pool, gfp_flags, order))) { @@ -442,6 +479,7 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, tt->caching); if (r) goto error_free_page; + caching = pages; } r = ttm_pool_page_allocated(pool, order, p, &dma_addr, &num_pages, &pages); @@ -468,15 +506,12 @@ int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt, return 0; error_free_page: - ttm_pool_free_page(pool, tt->caching, order, p); + ttm_pool_free_page(pool, page_caching, order, p); error_free_all: num_pages = tt->num_pages - num_pages; - for (i = 0; i < num_pages; ) { - order = ttm_pool_page_order(pool, tt->pages[i]); - ttm_pool_free_page(pool, tt->caching, order, tt->pages[i]); - i += 1 << order; - } + __ttm_pool_free(pool, tt, caching, tt->caching, ttm_cached, + num_pages); return r; } @@ -492,27 +527,8 @@ EXPORT_SYMBOL(ttm_pool_alloc); */ void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt) { - unsigned int i; - - for (i = 0; i < tt->num_pages; ) { - struct page *p = tt->pages[i]; - unsigned int order, num_pages; - struct ttm_pool_type *pt; - - order = ttm_pool_page_order(pool, p); - num_pages = 1ULL << order; - if (tt->dma_address) - ttm_pool_unmap(pool, tt->dma_address[i], num_pages); - - pt = ttm_pool_select_type(pool, tt->caching, order); - if (pt) - ttm_pool_type_give(pt, tt->pages[i]); - else - ttm_pool_free_page(pool, tt->caching, order, - tt->pages[i]); - - i += num_pages; - } + __ttm_pool_free(pool, tt, NULL, tt->caching, tt->caching, + tt->num_pages); while (atomic_long_read(&allocated_pages) > page_pool_size) ttm_pool_shrink();