diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0735-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0735-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0735-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch b/target/linux/bcm27xx/patches-5.4/950-0735-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch new file mode 100644 index 0000000000..d1828702b4 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0735-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch @@ -0,0 +1,251 @@ +From d5e996267c71a9517b2c831d072e76bacb8f0e56 Mon Sep 17 00:00:00 2001 +From: John Stultz <john.stultz@linaro.org> +Date: Tue, 3 Dec 2019 17:26:40 +0000 +Subject: [PATCH] dma-buf: heaps: Add CMA heap to dmabuf heaps + +Commit b61614ec318aae0c77ecd2816878d851dd61d9a6 upstream. + +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! + +NOTE: This patch only adds the default CMA heap. We will enable +selectively adding other CMA memory regions to the dmabuf heaps +interface with a later patch (which requires a dt binding) + +Cc: Laura Abbott <labbott@redhat.com> +Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org> +Cc: Sumit Semwal <sumit.semwal@linaro.org> +Cc: Liam Mark <lmark@codeaurora.org> +Cc: Pratik Patel <pratikp@codeaurora.org> +Cc: Brian Starkey <Brian.Starkey@arm.com> +Cc: Vincent Donnefort <Vincent.Donnefort@arm.com> +Cc: Sudipto Paul <Sudipto.Paul@arm.com> +Cc: Andrew F. Davis <afd@ti.com> +Cc: Christoph Hellwig <hch@infradead.org> +Cc: Chenbo Feng <fengc@google.com> +Cc: Alistair Strachan <astrachan@google.com> +Cc: Hridya Valsaraju <hridya@google.com> +Cc: Sandeep Patil <sspatil@google.com> +Cc: Hillf Danton <hdanton@sina.com> +Cc: Dave Airlie <airlied@gmail.com> +Cc: dri-devel@lists.freedesktop.org +Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> +Reviewed-by: Brian Starkey <brian.starkey@arm.com> +Acked-by: Sandeep Patil <sspatil@android.com> +Acked-by: Laura Abbott <labbott@redhat.com> +Tested-by: Ayan Kumar Halder <ayan.halder@arm.com> +Signed-off-by: John Stultz <john.stultz@linaro.org> +Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> +Link: https://patchwork.freedesktop.org/patch/msgid/20191203172641.66642-5-john.stultz@linaro.org +--- + drivers/dma-buf/heaps/Kconfig | 8 ++ + drivers/dma-buf/heaps/Makefile | 1 + + drivers/dma-buf/heaps/cma_heap.c | 177 +++++++++++++++++++++++++++++++ + 3 files changed, 186 insertions(+) + create mode 100644 drivers/dma-buf/heaps/cma_heap.c + +--- 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. +--- 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 +--- /dev/null ++++ b/drivers/dma-buf/heaps/cma_heap.c +@@ -0,0 +1,177 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * DMABUF CMA heap exporter ++ * ++ * Copyright (C) 2012, 2019 Linaro Ltd. ++ * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson. ++ */ ++ ++#include <linux/cma.h> ++#include <linux/device.h> ++#include <linux/dma-buf.h> ++#include <linux/dma-heap.h> ++#include <linux/dma-contiguous.h> ++#include <linux/err.h> ++#include <linux/errno.h> ++#include <linux/highmem.h> ++#include <linux/module.h> ++#include <linux/slab.h> ++#include <linux/scatterlist.h> ++#include <linux/sched/signal.h> ++ ++#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->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_default_cma_heap(void) ++{ ++ struct cma *default_cma = dev_get_cma_area(NULL); ++ int ret = 0; ++ ++ if (default_cma) ++ ret = __add_cma_heap(default_cma, NULL); ++ ++ return ret; ++} ++module_init(add_default_cma_heap); ++MODULE_DESCRIPTION("DMA-BUF CMA Heap"); ++MODULE_LICENSE("GPL v2"); |