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authorJohn Stultz <john.stultz@linaro.org>2019-10-21 19:03:09 +0000
committerSumit Semwal <sumit.semwal@linaro.org>2019-10-25 17:01:49 +0530
commit43d7238fb9ac897b29912368b3359e72bae469c4 (patch)
treeac029e781bee42f9e95521c3e4f97676f96c58a6 /drivers/dma-buf/heaps
parent47a32f9c12266d450b92089148c6039591bd9909 (diff)
dma-buf: heaps: Add CMA heap to dmabuf heaps
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: Hillf Danton <hdanton@sina.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: 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/20191021190310.85221-5-john.stultz@linaro.org
Diffstat (limited to 'drivers/dma-buf/heaps')
-rw-r--r--drivers/dma-buf/heaps/Kconfig8
-rw-r--r--drivers/dma-buf/heaps/Makefile1
-rw-r--r--drivers/dma-buf/heaps/cma_heap.c178
3 files changed, 187 insertions, 0 deletions
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..064926b5d735
--- /dev/null
+++ b/drivers/dma-buf/heaps/cma_heap.c
@@ -0,0 +1,178 @@
+// 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->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_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");