From patchwork Thu Oct 10 18:44:57 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Stultz X-Patchwork-Id: 11184077 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 103BE76 for ; Thu, 10 Oct 2019 18:45:18 +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 EDF0A2053B for ; Thu, 10 Oct 2019 18:45:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EDF0A2053B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E30EC6E3B7; Thu, 10 Oct 2019 18:45:15 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail-pg1-x541.google.com (mail-pg1-x541.google.com [IPv6:2607:f8b0:4864:20::541]) by gabe.freedesktop.org (Postfix) with ESMTPS id 839A96E3B5 for ; Thu, 10 Oct 2019 18:45:12 +0000 (UTC) Received: by mail-pg1-x541.google.com with SMTP id 23so4232892pgk.3 for ; Thu, 10 Oct 2019 11:45:12 -0700 (PDT) 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=84rQRvz4YQaobYEvo+nadGSaj2h3o4GlGdAWJKmwwCk=; b=QVRyHDlwyZRF85AYU6A1Dlmus0GcqANUHT15gzoIH1FPElnMzRulDevBZuWLqbjf6a Pvv/VOsVROk1gMSdrzf1tOI/K7H4T6XSR3DQrEftWHdXVyPyvAJuMWdE/qZT5UfYh6KM 4YdHGVndUYo+kCdQbE61yelwqDv+LOj2nlP/sNg/chy9aJA6arFVWJIRUpr19U8uZKrh eoRMZHkuLu/Ji7crvL75O0jxYAAyfFrIuKXFadJNVk707jlN5AXCRbo6a+zY0KDvEYNN a8+c5A0xxRxvWKEp5MDYIWid7pok67Q4/s/Kz4+trzsbQIXX833beEBHGiSJh/GiB7Ia Y77Q== X-Gm-Message-State: APjAAAXjHLicxgpdmJuu8uoKFCK18vcc5FHP9imZnWy1iwXA/9mjdbOV TEDmxmxcnsy4FD8T+IQkIAHQSg== X-Google-Smtp-Source: APXvYqyi3okimGiVgEhtd+hTQADNPf+F64QTC8REZT+KczbP9z5rwdZdUqoRm/opAMqXgAJUS6hB1g== X-Received: by 2002:a65:644c:: with SMTP id s12mr12574118pgv.319.1570733111776; Thu, 10 Oct 2019 11:45:11 -0700 (PDT) Received: from localhost.localdomain ([2601:1c2:680:1319:692:26ff:feda:3a81]) by smtp.gmail.com with ESMTPSA id w65sm7541732pfb.106.2019.10.10.11.45.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Oct 2019 11:45:10 -0700 (PDT) From: John Stultz To: lkml Subject: [PATCH v11 4/5] dma-buf: heaps: Add CMA heap to dmabuf heaps Date: Thu, 10 Oct 2019 18:44:57 +0000 Message-Id: <20191010184458.51039-5-john.stultz@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191010184458.51039-1-john.stultz@linaro.org> References: <20191010184458.51039-1-john.stultz@linaro.org> X-Mailman-Original-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=84rQRvz4YQaobYEvo+nadGSaj2h3o4GlGdAWJKmwwCk=; b=TKgZhNHxQfMmzrBNE2q5m5xJMvXBKx/gCb0lulxHtq+q5bl8gB8A5hR2B81/TD1/zs GNae2FhvTpym90JViRQY52Lh0b/+pKO5F1NrNgz70OQl0HFKuDyvgWdqPgKolFGG2PbC a+rztl/TgphYuCsYKwWMjp/ZV8S7KSbiMxQ5YrvqnB75ksna8RPdMthaER4fDG5O9X1z Nx/SZHxwKNOOweRe1ecm2Ps+JcKmlfXKtMIQq5ITKqbN4llhA8KRFm85LRkIhoPRFASf RcfkgsJkhOuvm6rDB5miryH1nT0I65/jp1w/xRjLOJ7QPRvHKp9xg3RdQAYnrLCE0E0D /BbQ== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Hillf Danton , Sudipto Paul , Vincent Donnefort , Chenbo Feng , Alistair Strachan , Liam Mark , Christoph Hellwig , dri-devel@lists.freedesktop.org, "Andrew F . Davis" , Hridya Valsaraju , Pratik Patel MIME-Version: 1.0 Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This adds a CMA heap, which allows userspace to allocate a dma-buf of contiguous memory out of a CMA region. This code is an evolution of the Android ION implementation, so thanks to its original author and maintainters: Benjamin Gaignard, 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: Christoph Hellwig Cc: Chenbo Feng Cc: Alistair Strachan Cc: Hridya Valsaraju Cc: Hillf Danton Cc: dri-devel@lists.freedesktop.org Reviewed-by: Benjamin Gaignard Reviewed-by: Brian Starkey Acked-by: Laura Abbott Tested-by: Ayan Kumar Halder Signed-off-by: John Stultz --- v2: * Switch allocate to return dmabuf fd * Simplify init code * Checkpatch fixups v3: * Switch to inline function for to_cma_heap() * Minor cleanups suggested by Brian * Fold in new registration style from Andrew * Folded in changes from Andrew to use simplified page list from the heap helpers v4: * Use the fd_flags when creating dmabuf fd (Suggested by Benjamin) * Use precalculated pagecount (Suggested by Andrew) v6: * Changed variable names to improve clarity, as suggested by Brian v7: * Use newly lower-cased init_heap_helper_buffer helper * Use new dmabuf export helper v8: * Make struct dma_heap_ops const (Suggested by Christoph) * Condense dma_heap_buffer and heap_helper_buffer (suggested by Christoph) * Checkpatch whitespace fixups v9: * Removing needless check noted by Brian Starkey * Rename dma_heap_get_data->dma_heap_get_drvdata suggested by Hilf Danton * Check signals after clearing memory pages to avoid doing needless work if the task is killed as suggested by Hilf --- drivers/dma-buf/heaps/Kconfig | 8 ++ drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/cma_heap.c | 169 +++++++++++++++++++++++++++++++ 3 files changed, 178 insertions(+) create mode 100644 drivers/dma-buf/heaps/cma_heap.c diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index 205052744169..a5eef06c4226 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -4,3 +4,11 @@ config DMABUF_HEAPS_SYSTEM 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. + +config DMABUF_HEAPS_CMA + bool "DMA-BUF CMA Heap" + depends on DMABUF_HEAPS && DMA_CMA + help + Choose this option to enable dma-buf CMA heap. This heap is backed + by the Contiguous Memory Allocator (CMA). If your system has these + regions, you should say Y here. diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile index d1808eca2581..6e54cdec3da0 100644 --- a/drivers/dma-buf/heaps/Makefile +++ b/drivers/dma-buf/heaps/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 obj-y += heap-helpers.o obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o +obj-$(CONFIG_DMABUF_HEAPS_CMA) += cma_heap.o diff --git a/drivers/dma-buf/heaps/cma_heap.c b/drivers/dma-buf/heaps/cma_heap.c new file mode 100644 index 000000000000..3fdb00e937c8 --- /dev/null +++ b/drivers/dma-buf/heaps/cma_heap.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DMABUF CMA heap exporter + * + * Copyright (C) 2012, 2019 Linaro Ltd. + * Author: for ST-Ericsson. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "heap-helpers.h" + +struct cma_heap { + struct dma_heap *heap; + struct cma *cma; +}; + +static void cma_heap_free(struct heap_helper_buffer *buffer) +{ + struct cma_heap *cma_heap = dma_heap_get_drvdata(buffer->heap); + unsigned long nr_pages = buffer->pagecount; + struct page *cma_pages = buffer->priv_virt; + + /* free page list */ + kfree(buffer->pages); + /* release memory */ + cma_release(cma_heap->cma, cma_pages, nr_pages); + kfree(buffer); +} + +/* dmabuf heap CMA operations functions */ +static int cma_heap_allocate(struct dma_heap *heap, + unsigned long len, + unsigned long fd_flags, + unsigned long heap_flags) +{ + struct cma_heap *cma_heap = dma_heap_get_drvdata(heap); + struct heap_helper_buffer *helper_buffer; + struct page *cma_pages; + size_t size = PAGE_ALIGN(len); + unsigned long nr_pages = size >> PAGE_SHIFT; + unsigned long align = get_order(size); + struct dma_buf *dmabuf; + int ret = -ENOMEM; + pgoff_t pg; + + if (align > CONFIG_CMA_ALIGNMENT) + align = CONFIG_CMA_ALIGNMENT; + + helper_buffer = kzalloc(sizeof(*helper_buffer), GFP_KERNEL); + if (!helper_buffer) + return -ENOMEM; + + init_heap_helper_buffer(helper_buffer, cma_heap_free); + helper_buffer->flags = heap_flags; + helper_buffer->heap = heap; + helper_buffer->size = len; + + cma_pages = cma_alloc(cma_heap->cma, nr_pages, align, false); + if (!cma_pages) + goto free_buf; + + if (PageHighMem(cma_pages)) { + unsigned long nr_clear_pages = nr_pages; + struct page *page = cma_pages; + + while (nr_clear_pages > 0) { + void *vaddr = kmap_atomic(page); + + memset(vaddr, 0, PAGE_SIZE); + kunmap_atomic(vaddr); + /* + * Avoid wasting time zeroing memory if the process + * has been killed by by SIGKILL + */ + if (fatal_signal_pending(current)) + goto free_cma; + + page++; + nr_clear_pages--; + } + } else { + memset(page_address(cma_pages), 0, size); + } + + helper_buffer->pagecount = nr_pages; + helper_buffer->pages = kmalloc_array(helper_buffer->pagecount, + sizeof(*helper_buffer->pages), + GFP_KERNEL); + if (!helper_buffer->pages) { + ret = -ENOMEM; + goto free_cma; + } + + for (pg = 0; pg < helper_buffer->pagecount; pg++) + helper_buffer->pages[pg] = &cma_pages[pg]; + + /* create the dmabuf */ + dmabuf = heap_helper_export_dmabuf(helper_buffer, fd_flags); + if (IS_ERR(dmabuf)) { + ret = PTR_ERR(dmabuf); + goto free_pages; + } + + helper_buffer->dmabuf = dmabuf; + helper_buffer->priv_virt = cma_pages; + + 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; + +free_pages: + kfree(helper_buffer->pages); +free_cma: + cma_release(cma_heap->cma, cma_pages, nr_pages); +free_buf: + kfree(helper_buffer); + return ret; +} + +static const struct dma_heap_ops cma_heap_ops = { + .allocate = cma_heap_allocate, +}; + +static int __add_cma_heap(struct cma *cma, void *data) +{ + struct cma_heap *cma_heap; + struct dma_heap_export_info exp_info; + + cma_heap = kzalloc(sizeof(*cma_heap), GFP_KERNEL); + if (!cma_heap) + return -ENOMEM; + cma_heap->cma = cma; + + exp_info.name = cma_get_name(cma); + exp_info.ops = &cma_heap_ops; + exp_info.priv = cma_heap; + + cma_heap->heap = dma_heap_add(&exp_info); + if (IS_ERR(cma_heap->heap)) { + int ret = PTR_ERR(cma_heap->heap); + + kfree(cma_heap); + return ret; + } + + return 0; +} + +static int add_cma_heaps(void) +{ + cma_for_each_area(__add_cma_heap, NULL); + return 0; +} +device_initcall(add_cma_heaps);