1 files changed, 0 insertions, 251 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0725-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch b/target/linux/bcm27xx/patches-5.4/950-0725-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch
deleted file mode 100644
index d1828702b4..0000000000
--- a/target/linux/bcm27xx/patches-5.4/950-0725-dma-buf-heaps-Add-CMA-heap-to-dmabuf-heaps.patch
+++ /dev/null
@@ -1,251 +0,0 @@
-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");