[v8,3/3] gpu: ion: add CMA heap

diff --git a/drivers/gpu/ion/Kconfig b/drivers/gpu/ion/Kconfig
index b5bfdb4..ea0a896 100644
--- a/drivers/gpu/ion/Kconfig
+++ b/drivers/gpu/ion/Kconfig
@@ -5,6 +5,11 @@  menuconfig ION
 	help
 	  Chose this option to enable the ION Memory Manager.
 
+config ION_CMA
+	bool
+	default y
+	depends on CMA && ION
+
 config ION_TEGRA
 	tristate "Ion for Tegra"
 	depends on ARCH_TEGRA && ION
diff --git a/drivers/gpu/ion/Makefile b/drivers/gpu/ion/Makefile
index d1ddebb..fddb85c 100644
--- a/drivers/gpu/ion/Makefile
+++ b/drivers/gpu/ion/Makefile
@@ -1,3 +1,4 @@ 
 obj-$(CONFIG_ION) +=	ion.o ion_heap.o ion_page_pool.o ion_system_heap.o \
 			ion_carveout_heap.o
+obj-$(CONFIG_ION_CMA) += ion_cma_heap.o
 obj-$(CONFIG_ION_TEGRA) += tegra/
diff --git a/drivers/gpu/ion/ion_cma_heap.c b/drivers/gpu/ion/ion_cma_heap.c
new file mode 100644
index 0000000..39c35dd
--- /dev/null
+++ b/drivers/gpu/ion/ion_cma_heap.c
@@ -0,0 +1,192 @@ 
+/*
+ * drivers/gpu/ion/ion_cma_heap.c
+ *
+ * Copyright (C) Linaro 2012
+ * Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/ion.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/dma-mapping.h>
+
+/* for ion_heap_ops structure */
+#include "ion_priv.h"
+
+#define ION_CMA_ALLOCATE_FAILED -1
+
+struct ion_cma_buffer_info {
+	void *cpu_addr;
+	dma_addr_t handle;
+	struct sg_table *table;
+};
+
+/*
+ * Create scatter-list for the already allocated DMA buffer.
+ * This function could be replaced by dma_common_get_sgtable
+ * as soon as it will avalaible.
+ */
+int ion_cma_get_sgtable(struct device *dev, struct sg_table *sgt,
+			void *cpu_addr, dma_addr_t handle, size_t size)
+{
+	struct page *page = virt_to_page(cpu_addr);
+	int ret;
+
+	ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
+	if (unlikely(ret))
+		return ret;
+
+	sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
+	return 0;
+}
+
+/* ION CMA heap operations functions */
+static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
+			    unsigned long len, unsigned long align,
+			    unsigned long flags)
+{
+	struct device *dev = heap->priv;
+	struct ion_cma_buffer_info *info;
+
+	dev_dbg(dev, "Request buffer allocation len %ld\n", len);
+
+	info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
+	if (!info) {
+		dev_err(dev, "Can't allocate buffer info\n");
+		return ION_CMA_ALLOCATE_FAILED;
+	}
+
+	info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle), 0);
+
+	if (!info->cpu_addr) {
+		dev_err(dev, "Fail to allocate buffer\n");
+		goto err;
+	}
+
+	info->table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
+	if (!info->table) {
+		dev_err(dev, "Fail to allocate sg table\n");
+		goto free_mem;
+	}
+
+	if (ion_cma_get_sgtable
+	    (dev, info->table, info->cpu_addr, info->handle, len))
+		goto free_table;
+
+	/* keep this for memory release */
+	buffer->priv_virt = info;
+	dev_dbg(dev, "Allocate buffer %p\n", buffer);
+	return 0;
+
+free_table:
+	kfree(info->table);
+free_mem:
+	dma_free_coherent(dev, len, info->cpu_addr, info->handle);
+err:
+	kfree(info);
+	return ION_CMA_ALLOCATE_FAILED;
+}
+
+static void ion_cma_free(struct ion_buffer *buffer)
+{
+	struct device *dev = buffer->heap->priv;
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	dev_dbg(dev, "Release buffer %p\n", buffer);
+	/* release memory */
+	dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle);
+	/* release sg table */
+	sg_free_table(info->table);
+	kfree(info->table);
+	kfree(info);
+}
+
+/* return physical address in addr */
+static int ion_cma_phys(struct ion_heap *heap, struct ion_buffer *buffer,
+			ion_phys_addr_t *addr, size_t *len)
+{
+	struct device *dev = heap->priv;
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer,
+		virt_to_phys(info->cpu_addr));
+
+	*addr = info->handle;
+	*len = buffer->size;
+
+	return 0;
+}
+
+struct sg_table *ion_cma_heap_map_dma(struct ion_heap *heap,
+				      struct ion_buffer *buffer)
+{
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	return info->table;
+}
+
+void ion_cma_heap_unmap_dma(struct ion_heap *heap, struct ion_buffer *buffer)
+{
+	return;
+}
+
+static int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer,
+			struct vm_area_struct *vma)
+{
+	struct device *dev = buffer->heap->priv;
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+	return dma_mmap_coherent(dev, vma, info->cpu_addr, info->handle,
+				 buffer->size);
+}
+
+void *ion_cma_map_kernel(struct ion_heap *heap, struct ion_buffer *buffer)
+{
+	struct ion_cma_buffer_info *info = buffer->priv_virt;
+	/* kernel memory mapping has been done at allocation time */
+	return info->cpu_addr;
+}
+
+static struct ion_heap_ops ion_cma_ops = {
+	.allocate = ion_cma_allocate,
+	.free = ion_cma_free,
+	.map_dma = ion_cma_heap_map_dma,
+	.unmap_dma = ion_cma_heap_unmap_dma,
+	.phys = ion_cma_phys,
+	.map_user = ion_cma_mmap,
+	.map_kernel = ion_cma_map_kernel,
+};
+
+struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data)
+{
+	struct ion_heap *heap;
+
+	heap = kzalloc(sizeof(struct ion_heap), GFP_KERNEL);
+
+	if (!heap)
+		return ERR_PTR(-ENOMEM);
+
+	heap->ops = &ion_cma_ops;
+	/* set device as private heaps data, later it will be
+	 * used to make the link with reserved CMA memory */
+	heap->priv = data->priv;
+	heap->type = ION_HEAP_TYPE_DMA;
+	return heap;
+}
+
+void ion_cma_heap_destroy(struct ion_heap *heap)
+{
+	kfree(heap);
+}
diff --git a/drivers/gpu/ion/ion_heap.c b/drivers/gpu/ion/ion_heap.c
index f9ab1df..c960230 100644
--- a/drivers/gpu/ion/ion_heap.c
+++ b/drivers/gpu/ion/ion_heap.c
@@ -32,6 +32,9 @@  struct ion_heap *ion_heap_create(struct ion_platform_heap *heap_data)
 	case ION_HEAP_TYPE_CARVEOUT:
 		heap = ion_carveout_heap_create(heap_data);
 		break;
+	case ION_HEAP_TYPE_DMA:
+		heap = ion_cma_heap_create(heap_data);
+		break;
 	default:
 		pr_err("%s: Invalid heap type %d\n", __func__,
 		       heap_data->type);
@@ -66,6 +69,9 @@  void ion_heap_destroy(struct ion_heap *heap)
 	case ION_HEAP_TYPE_CARVEOUT:
 		ion_carveout_heap_destroy(heap);
 		break;
+	case ION_HEAP_TYPE_DMA:
+		ion_cma_heap_destroy(heap);
+		break;
 	default:
 		pr_err("%s: Invalid heap type %d\n", __func__,
 		       heap->type);
diff --git a/drivers/gpu/ion/ion_priv.h b/drivers/gpu/ion/ion_priv.h
index a31203b..046f1a2 100644
--- a/drivers/gpu/ion/ion_priv.h
+++ b/drivers/gpu/ion/ion_priv.h
@@ -203,6 +203,20 @@  ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap, unsigned long size,
 				      unsigned long align);
 void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
 		       unsigned long size);
+
+#ifdef CONFIG_CMA
+struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *heap);
+void ion_cma_heap_destroy(struct ion_heap *heap);
+#else
+static inline struct ion_heap *ion_cma_heap_create(struct ion_platform_heap
+						   *heap)
+{
+	return NULL;
+}
+
+static inline void ion_cma_heap_destroy(struct ion_heap *heap) {};
+#endif
+
 /**
  * The carveout heap returns physical addresses, since 0 may be a valid
  * physical address, this is used to indicate allocation failed
diff --git a/include/linux/ion.h b/include/linux/ion.h
index b85f4b1..3ccc75a 100644
--- a/include/linux/ion.h
+++ b/include/linux/ion.h
@@ -27,6 +27,7 @@  struct ion_handle;
  * @ION_HEAP_TYPE_CARVEOUT:	 memory allocated from a prereserved
  * 				 carveout heap, allocations are physically
  * 				 contiguous
+ * @ION_HEAP_TYPE_DMA:		 memory allocated via DMA API
  * @ION_NUM_HEAPS:		 helper for iterating over heaps, a bit mask
  * 				 is used to identify the heaps, so only 32
  * 				 total heap types are supported
@@ -35,6 +36,7 @@  enum ion_heap_type {
 	ION_HEAP_TYPE_SYSTEM,
 	ION_HEAP_TYPE_SYSTEM_CONTIG,
 	ION_HEAP_TYPE_CARVEOUT,
+	ION_HEAP_TYPE_DMA,
 	ION_HEAP_TYPE_CUSTOM, /* must be last so device specific heaps always
 				 are at the end of this enum */
 	ION_NUM_HEAPS = 16,
@@ -43,6 +45,7 @@  enum ion_heap_type {
 #define ION_HEAP_SYSTEM_MASK		(1 << ION_HEAP_TYPE_SYSTEM)
 #define ION_HEAP_SYSTEM_CONTIG_MASK	(1 << ION_HEAP_TYPE_SYSTEM_CONTIG)
 #define ION_HEAP_CARVEOUT_MASK		(1 << ION_HEAP_TYPE_CARVEOUT)
+#define ION_HEAP_TYPE_DMA_MASK		(1 << ION_HEAP_TYPE_DMA)
 
 /**
  * heap flags - the lower 16 bits are used by core ion, the upper 16