From patchwork Thu Dec 17 23:06:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 345718 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, 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 F2B3DC2D0E4 for ; Thu, 17 Dec 2020 23:07:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D486723A6C for ; Thu, 17 Dec 2020 23:07:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732166AbgLQXHA (ORCPT ); Thu, 17 Dec 2020 18:07:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59780 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729402AbgLQXHA (ORCPT ); Thu, 17 Dec 2020 18:07:00 -0500 Received: from mail-pg1-x533.google.com (mail-pg1-x533.google.com [IPv6:2607:f8b0:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E9F00C0617B0 for ; Thu, 17 Dec 2020 15:06:19 -0800 (PST) Received: by mail-pg1-x533.google.com with SMTP id z21so130931pgj.4 for ; Thu, 17 Dec 2020 15:06:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=uAZMFvhVb6Eal/4evY++sNk0jscaxGLqs718IzEgtfA=; b=v83XWYa2YNnPD7aec5PNdxseR1Y/sUisiPYfR8FyqDAFb2zErOKxJgtsQUmOqyjedz NGiZ+FhC+mwAcIfB2l2m9WN7be9bU+vNtCNDiKnjvMFk5vZQaGF1mkSLePMo+oepC9Cn IFk7GlCNU5CfZ5ux4nzNStixNyFV5EDh/qEvSv+y6+1Sqw/THn1pc4kTu79MZA0pQsLz Dla5S7ftQ5RrH0hpPgrfoLldX9wzx/Vq92GVt8J+TvwFWKboHOOyiP9R7RsZZ6kS+vOn 3NB+xMDwPW7mVzTt6i8ll05ptaILp7GY1I5t0aAtjZKJnKUQ/KUpSQdpA7MEZmpe9B21 vxug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=uAZMFvhVb6Eal/4evY++sNk0jscaxGLqs718IzEgtfA=; b=EZMO4ZKUlNUXQKB/2450oeYde04lxE9yjWso0UhhANYRsT4raBR06HucKBJH0lPJ5J 2WhVyQBa4NjWGh08z+ab6IzJifKZM8RehHLIAbIi8N6XhIpObruecH2phXsY+Ve1ISYD ng372/y4hTv95WvgAdxB0sbB7paCyUzbZPfZsDVCIQl0ZM5dUEkgOQm2ggLNop6ABnV7 vymXp5+vG67ki/6RNJ8xlL0I0+tz4APsDvSDy+cxYQItq13B0e8FhUeZlymYY9AVZMZ/ FGHQQw3zKBCKkNClYTdvXxaqJOV/g/m0sn1AELHvfwxyI94blwmkuoLTLxvyPqm6HL1x 1YxQ== X-Gm-Message-State: AOAM530Jvc4cdWOfHYLYRVn6PO8crIu92NXaQW/ubN7kYgIYCg0Nn412 tC/eylXLieO0hqRH19DWHbhAPA== X-Google-Smtp-Source: ABdhPJwymKjQzvxQu0BjSpaG0P1NH7tVHLKT/pmV+W4uevA6LHyp/eohg7UcoVWSSb/68o0OizIdXQ== X-Received: by 2002:a63:1b58:: with SMTP id b24mr1505551pgm.38.1608246379486; Thu, 17 Dec 2020 15:06:19 -0800 (PST) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id q9sm7074036pgb.82.2020.12.17.15.06.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Dec 2020 15:06:18 -0800 (PST) From: John Stultz To: lkml Cc: John Stultz , Sumit Semwal , Liam Mark , Chris Goldsworthy , Laura Abbott , Brian Starkey , Hridya Valsaraju , Suren Baghdasaryan , Sandeep Patil , Daniel Mentz , =?utf-8?q?=C3=98rjan_Eide?= , Robin Murphy , Ezequiel Garcia , Simon Ser , James Jones , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [RFC][PATCH 2/3] dma-buf: system_heap: Add pagepool support to system heap Date: Thu, 17 Dec 2020 23:06:11 +0000 Message-Id: <20201217230612.32397-2-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201217230612.32397-1-john.stultz@linaro.org> References: <20201217230612.32397-1-john.stultz@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Reuse/abuse the pagepool code from the network code to speed up allocation performance. This is similar to the ION pagepool usage, but tries to utilize generic code instead of a custom implementation. Cc: Sumit Semwal Cc: Liam Mark Cc: Chris Goldsworthy Cc: Laura Abbott Cc: Brian Starkey Cc: Hridya Valsaraju Cc: Suren Baghdasaryan Cc: Sandeep Patil Cc: Daniel Mentz Cc: Ørjan Eide Cc: Robin Murphy Cc: Ezequiel Garcia Cc: Simon Ser Cc: James Jones Cc: linux-media@vger.kernel.org Cc: dri-devel@lists.freedesktop.org Signed-off-by: John Stultz --- drivers/dma-buf/heaps/Kconfig | 1 + drivers/dma-buf/heaps/system_heap.c | 68 +++++++++++++++++++++++++++-- 2 files changed, 65 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index ecf65204f714..fa5e1c330cce 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -4,6 +4,7 @@ config DMABUF_HEAPS_DEFERRED_FREE config DMABUF_HEAPS_SYSTEM bool "DMA-BUF System Heap" depends on DMABUF_HEAPS + select PAGE_POOL help Choose this option to enable the system dmabuf heap. The system heap is backed by pages from the buddy allocator. If in doubt, say Y. diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c index 17e0e9a68baf..885e30894b77 100644 --- a/drivers/dma-buf/heaps/system_heap.c +++ b/drivers/dma-buf/heaps/system_heap.c @@ -20,6 +20,7 @@ #include #include #include +#include static struct dma_heap *sys_heap; @@ -53,6 +54,7 @@ static gfp_t order_flags[] = {HIGH_ORDER_GFP, LOW_ORDER_GFP, LOW_ORDER_GFP}; */ static const unsigned int orders[] = {8, 4, 0}; #define NUM_ORDERS ARRAY_SIZE(orders) +struct page_pool *pools[NUM_ORDERS]; static struct sg_table *dup_sg_table(struct sg_table *table) { @@ -281,18 +283,59 @@ static void system_heap_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) dma_buf_map_clear(map); } +static int system_heap_clear_pages(struct page **pages, int num, pgprot_t pgprot) +{ + void *addr = vmap(pages, num, VM_MAP, pgprot); + + if (!addr) + return -ENOMEM; + memset(addr, 0, PAGE_SIZE * num); + vunmap(addr); + return 0; +} + +static int system_heap_zero_buffer(struct system_heap_buffer *buffer) +{ + struct sg_table *sgt = &buffer->sg_table; + struct sg_page_iter piter; + struct page *pages[32]; + int p = 0; + int ret = 0; + + for_each_sgtable_page(sgt, &piter, 0) { + pages[p++] = sg_page_iter_page(&piter); + if (p == ARRAY_SIZE(pages)) { + ret = system_heap_clear_pages(pages, p, PAGE_KERNEL); + if (ret) + return ret; + p = 0; + } + } + if (p) + ret = system_heap_clear_pages(pages, p, PAGE_KERNEL); + + return ret; +} + static void system_heap_dma_buf_release(struct dma_buf *dmabuf) { struct system_heap_buffer *buffer = dmabuf->priv; struct sg_table *table; struct scatterlist *sg; - int i; + int i, j; + + /* Zero the buffer pages before adding back to the pool */ + system_heap_zero_buffer(buffer); table = &buffer->sg_table; for_each_sg(table->sgl, sg, table->nents, i) { struct page *page = sg_page(sg); - __free_pages(page, compound_order(page)); + for (j = 0; j < NUM_ORDERS; j++) { + if (compound_order(page) == orders[j]) + break; + } + page_pool_put_full_page(pools[j], page, false); } sg_free_table(table); kfree(buffer); @@ -322,8 +365,7 @@ static struct page *alloc_largest_available(unsigned long size, continue; if (max_order < orders[i]) continue; - - page = alloc_pages(order_flags[i], orders[i]); + page = page_pool_alloc_pages(pools[i], order_flags[i]); if (!page) continue; return page; @@ -428,6 +470,24 @@ static const struct dma_heap_ops system_heap_ops = { static int system_heap_create(void) { struct dma_heap_export_info exp_info; + int i; + + for (i = 0; i < NUM_ORDERS; i++) { + struct page_pool_params pp; + + memset(&pp, 0, sizeof(pp)); + pp.order = orders[i]; + pools[i] = page_pool_create(&pp); + + if (IS_ERR(pools[i])) { + int j; + + pr_err("%s: page pool creation failed!\n", __func__); + for (j = 0; j < i; j++) + page_pool_destroy(pools[j]); + return PTR_ERR(pools[i]); + } + } exp_info.name = "system"; exp_info.ops = &system_heap_ops;