From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 2F62FC43613 for ; Mon, 24 Jun 2019 19:49:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EC72D20663 for ; Mon, 24 Jun 2019 19:49:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="OMGVGMdG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731016AbfFXTt3 (ORCPT ); Mon, 24 Jun 2019 15:49:29 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:46858 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728172AbfFXTtW (ORCPT ); Mon, 24 Jun 2019 15:49:22 -0400 Received: by mail-pg1-f195.google.com with SMTP id v9so7638217pgr.13 for ; Mon, 24 Jun 2019 12:49:21 -0700 (PDT) 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; bh=oWVUodEWikobPmP2NxI6TMAts5qOQ2aR1KHWV1qmHaY=; b=OMGVGMdG7FI2WEBe6paPJXvzmL9umAeCrvt+690kiATXRKWLJnY0k3dSzGGezlHsaL bmlZw4HZwdAw0eQzp+j63SuqCnqzbQW33LtTrRK0CgvIZrzprXcVkL/Gb28w4lvE3wwr unVuDRKjhwJ9RjnOyrxE0AAHhwC6uOh/FkA9J9BoroM39Uy4s6JwOZ9HOHX5nnnBjKuF iyvP82d1AnDoWWAujZJftmexWhbA9zR+QbgWdTtVy6k4cJa5DUm6TSso60NQcsnf+mDH 01K/2riu7EZaFbuXbGKZfMaGuUK8UPeAUjO80EonhjSnTeGJ+TAigZTr8J20Giaf5xW7 5CoQ== 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; bh=oWVUodEWikobPmP2NxI6TMAts5qOQ2aR1KHWV1qmHaY=; b=siRLanPW5SNctcoqvQldcvnIcrikgza65pzKpGiOORc9LOsiVH9GxigbpiVYrZDTqC sLauQiYwrlEG8viIs5gazuC783013WRHaOhGDgksLnEGeI92MLVJ1hVxxddNl9+iX6fF M/G4sPAasITM3RQouSOmnAGR9xOy/LTsejZEPxXs9t7CAUdlwqsLkdQYRgcVf1URjBJj 190Ag2ZZenpCGEthWgV0b2IET59PulkEyg158ZQEqec709ZszqLn7kDl3iiKIvMfR5OV JOncS67oYjQGw6TWW8U4uqM2xUBeFH6jTCHtYKloIuKHt6WpEgVEQbRIcmBfOkACcDhK 81uw== X-Gm-Message-State: APjAAAXTohiEiz/r8UKBvdQJPgu9bhgQrJxEDMLZW1143oQetwMWfNSu bsyVkMXJk8606xsxbpsBuPhPS2tE1ZY= X-Google-Smtp-Source: APXvYqxsUnp1BDfjcABrnn89z0dnV99eBZbZu9ehmgAAHGJhsqkMLcsGy8DN97NIAl5/baVeTn3Rcg== X-Received: by 2002:a17:90a:3210:: with SMTP id k16mr25862830pjb.13.1561405760500; Mon, 24 Jun 2019 12:49:20 -0700 (PDT) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id v3sm7957031pfm.188.2019.06.24.12.49.18 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 24 Jun 2019 12:49:19 -0700 (PDT) From: John Stultz To: lkml Cc: John Stultz , Laura Abbott , Benjamin Gaignard , Sumit Semwal , Liam Mark , Pratik Patel , Brian Starkey , Vincent Donnefort , Sudipto Paul , "Andrew F . Davis" , Xu YiPing , "Chenfeng (puck)" , butao , "Xiaqing (A)" , Yudongbin , Christoph Hellwig , Chenbo Feng , Alistair Strachan , dri-devel@lists.freedesktop.org Subject: [PATCH v6 3/5] dma-buf: heaps: Add system heap to dmabuf heaps Date: Mon, 24 Jun 2019 19:49:06 +0000 Message-Id: <20190624194908.121273-4-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190624194908.121273-1-john.stultz@linaro.org> References: <20190624194908.121273-1-john.stultz@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds system heap to the dma-buf heaps framework. This allows applications to get a page-allocator backed dma-buf for non-contiguous memory. This code is an evolution of the Android ION implementation, so thanks to its original authors and maintainters: Rebecca Schultz Zavin, Colin Cross, Laura Abbott, and others! Cc: Laura Abbott Cc: Benjamin Gaignard Cc: Sumit Semwal Cc: Liam Mark Cc: Pratik Patel Cc: Brian Starkey Cc: Vincent Donnefort Cc: Sudipto Paul Cc: Andrew F. Davis Cc: Xu YiPing Cc: "Chenfeng (puck)" Cc: butao Cc: "Xiaqing (A)" Cc: Yudongbin Cc: Christoph Hellwig Cc: Chenbo Feng Cc: Alistair Strachan Cc: dri-devel@lists.freedesktop.org Reviewed-by: Benjamin Gaignard Signed-off-by: John Stultz Change-Id: I4dc5ff54ccb1f7ca3ac8675661114ca33813654b --- v2: * Switch allocate to return dmabuf fd * Simplify init code * Checkpatch fixups * Droped dead system-contig code v3: * Whitespace fixups from Benjamin * Make sure we're zeroing the allocated pages (from Liam) * Use PAGE_ALIGN() consistently (suggested by Brian) * Fold in new registration style from Andrew * Avoid needless dynamic allocation of sys_heap (suggested by Christoph) * Minor cleanups * Folded in changes from Andrew to use simplified page list from the heap helpers v4: * Optimization to allocate pages in chunks, similar to old pagepool code * Use fd_flags when creating dmabuf fd (Suggested by Benjamin) v5: * Back out large order page allocations (was leaking memory, as the page array didn't properly track order size) v6: * Minor whitespace change suggested by Brian * Remove unused variable --- drivers/dma-buf/Kconfig | 2 + drivers/dma-buf/heaps/Kconfig | 6 ++ drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/system_heap.c | 121 ++++++++++++++++++++++++++++ 4 files changed, 130 insertions(+) create mode 100644 drivers/dma-buf/heaps/Kconfig create mode 100644 drivers/dma-buf/heaps/system_heap.c diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig index 9b93f86f597c..434cfe646dad 100644 --- a/drivers/dma-buf/Kconfig +++ b/drivers/dma-buf/Kconfig @@ -47,4 +47,6 @@ menuconfig DMABUF_HEAPS this allows userspace to allocate dma-bufs that can be shared between drivers. +source "drivers/dma-buf/heaps/Kconfig" + endmenu diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig new file mode 100644 index 000000000000..205052744169 --- /dev/null +++ b/drivers/dma-buf/heaps/Kconfig @@ -0,0 +1,6 @@ +config DMABUF_HEAPS_SYSTEM + bool "DMA-BUF System Heap" + depends on DMABUF_HEAPS + 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/Makefile b/drivers/dma-buf/heaps/Makefile index de49898112db..d1808eca2581 100644 --- a/drivers/dma-buf/heaps/Makefile +++ b/drivers/dma-buf/heaps/Makefile @@ -1,2 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 obj-y += heap-helpers.o +obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c new file mode 100644 index 000000000000..6a16806181c2 --- /dev/null +++ b/drivers/dma-buf/heaps/system_heap.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DMABUF System heap exporter + * + * Copyright (C) 2011 Google, Inc. + * Copyright (C) 2019 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "heap-helpers.h" + +struct system_heap { + struct dma_heap *heap; +} sys_heap; + +static void system_heap_free(struct heap_helper_buffer *buffer) +{ + pgoff_t pg; + + for (pg = 0; pg < buffer->pagecount; pg++) + __free_page(buffer->pages[pg]); + kfree(buffer->pages); + kfree(buffer); +} + +static int system_heap_allocate(struct dma_heap *heap, + unsigned long len, + unsigned long fd_flags, + unsigned long heap_flags) +{ + struct heap_helper_buffer *helper_buffer; + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + struct dma_buf *dmabuf; + int ret = -ENOMEM; + pgoff_t pg; + + helper_buffer = kzalloc(sizeof(*helper_buffer), GFP_KERNEL); + if (!helper_buffer) + return -ENOMEM; + + INIT_HEAP_HELPER_BUFFER(helper_buffer, system_heap_free); + helper_buffer->heap_buffer.flags = heap_flags; + helper_buffer->heap_buffer.heap = heap; + helper_buffer->heap_buffer.size = len; + + helper_buffer->pagecount = len / PAGE_SIZE; + helper_buffer->pages = kmalloc_array(helper_buffer->pagecount, + sizeof(*helper_buffer->pages), + GFP_KERNEL); + if (!helper_buffer->pages) { + ret = -ENOMEM; + goto err0; + } + + for (pg = 0; pg < helper_buffer->pagecount; pg++) { + helper_buffer->pages[pg] = alloc_page(GFP_KERNEL | __GFP_ZERO); + if (!helper_buffer->pages[pg]) + goto err1; + } + + /* create the dmabuf */ + exp_info.ops = &heap_helper_ops; + exp_info.size = len; + exp_info.flags = fd_flags; + exp_info.priv = &helper_buffer->heap_buffer; + dmabuf = dma_buf_export(&exp_info); + if (IS_ERR(dmabuf)) { + ret = PTR_ERR(dmabuf); + goto err1; + } + + helper_buffer->heap_buffer.dmabuf = dmabuf; + + ret = dma_buf_fd(dmabuf, fd_flags); + if (ret < 0) { + dma_buf_put(dmabuf); + /* just return, as put will call release and that will free */ + return ret; + } + + return ret; + +err1: + while (pg > 0) + __free_page(helper_buffer->pages[--pg]); + kfree(helper_buffer->pages); +err0: + kfree(helper_buffer); + + return -ENOMEM; +} + +static struct dma_heap_ops system_heap_ops = { + .allocate = system_heap_allocate, +}; + +static int system_heap_create(void) +{ + struct dma_heap_export_info exp_info; + int ret = 0; + + exp_info.name = "system_heap"; + exp_info.ops = &system_heap_ops; + exp_info.priv = &sys_heap; + + sys_heap.heap = dma_heap_add(&exp_info); + if (IS_ERR(sys_heap.heap)) + ret = PTR_ERR(sys_heap.heap); + + return ret; +} +device_initcall(system_heap_create); -- 2.17.1