[PATCH 070/115] gpu: ion: add CMA heap

John Stultz
2013-12-13T22:33:57Z

From: Benjamin Gaignard <benjamin.gaignard@linaro.org>

New heap type ION_HEAP_TYPE_DMA where allocation is done with dma_alloc_coherent API.
device coherent_dma_mask must be set to DMA_BIT_MASK(32).
ion_platform_heap private field is used to retrieve the device linked to CMA,
if NULL the default CMA area is used.
ion_cma_get_sgtable is a copy of dma_common_get_sgtable function which should
be in kernel 3.5

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
drivers/staging/android/ion/Makefile | 2 +-
drivers/staging/android/ion/ion.h | 7 +-
drivers/staging/android/ion/ion_cma_heap.c | 233 +++++++++++++++++++++++++++++
drivers/staging/android/ion/ion_heap.c | 6 +
drivers/staging/android/ion/ion_priv.h | 3 +
5 files changed, 249 insertions(+), 2 deletions(-)
create mode 100644 drivers/staging/android/ion/ion_cma_heap.c

diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index 306fff9..ce0f1ef 100644
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -1,3 +1,3 @@
obj-$(CONFIG_ION) += ion.o ion_heap.o ion_page_pool.o ion_system_heap.o \
- ion_carveout_heap.o ion_chunk_heap.o
+ ion_carveout_heap.o ion_chunk_heap.o ion_cma_heap.o
obj-$(CONFIG_ION_TEGRA) += tegra/
diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
index 226bfd5..3942b3e 100644
--- a/drivers/staging/android/ion/ion.h
+++ b/drivers/staging/android/ion/ion.h
@@ -27,13 +27,17 @@ struct ion_handle;
* @ION_HEAP_TYPE_CARVEOUT: memory allocated from a prereserved
* carveout heap, allocations are physically
* contiguous
- * @ION_HEAP_END: helper for iterating over heaps
+ * @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
*/
enum ion_heap_type {
ION_HEAP_TYPE_SYSTEM,
ION_HEAP_TYPE_SYSTEM_CONTIG,
ION_HEAP_TYPE_CARVEOUT,
ION_HEAP_TYPE_CHUNK,
+ 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,
@@ -42,6 +46,7 @@ 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)

#define ION_NUM_HEAP_IDS sizeof(unsigned int) * 8

diff --git a/drivers/staging/android/ion/ion_cma_heap.c b/drivers/staging/android/ion/ion_cma_heap.c
new file mode 100644
index 0000000..74e3c77
--- /dev/null
+++ b/drivers/staging/android/ion/ion_cma_heap.c
@@ -0,0 +1,233 @@
+/*
+ * drivers/staging/android/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/slab.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/dma-mapping.h>
+
+#include "ion.h"
+#include "ion_priv.h"
+
+#define ION_CMA_ALLOCATE_FAILED -1
+
+struct ion_cma_heap {
+ struct ion_heap heap;
+ struct device *dev;
+};
+
+#define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)
+
+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;
+}
+
+/*
+ * Create scatter-list for each page of the already allocated DMA buffer.
+ */
+int ion_cma_get_sgtable_per_page(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, i;
+ struct scatterlist *sg;
+
+ ret = sg_alloc_table(sgt, PAGE_ALIGN(size) / PAGE_SIZE, GFP_KERNEL);
+ if (unlikely(ret))
+ return ret;
+
+ sg = sgt->sgl;
+ for (i = 0; i < (PAGE_ALIGN(size) / PAGE_SIZE); i++) {
+ page = virt_to_page(cpu_addr + (i * PAGE_SIZE));
+ sg_set_page(sg, page, PAGE_SIZE, 0);
+ sg = sg_next(sg);
+ }
+ 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 ion_cma_heap *cma_heap = to_cma_heap(heap);
+ struct device *dev = cma_heap->dev;
+ 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_buffer_fault_user_mappings(buffer)) {
+ if (ion_cma_get_sgtable_per_page
+ (dev, info->table, info->cpu_addr, info->handle, len))
+ goto free_table;
+ } else {
+ 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 ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
+ struct device *dev = cma_heap->dev;
+ 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 ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
+ struct device *dev = cma_heap->dev;
+ struct ion_cma_buffer_info *info = buffer->priv_virt;
+
+ dev_dbg(dev, "Return buffer %p physical address 0x%x\n", buffer,
+ info->handle);
+
+ *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 ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
+ struct device *dev = cma_heap->dev;
+ 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_cma_heap *cma_heap;
+
+ cma_heap = kzalloc(sizeof(struct ion_cma_heap), GFP_KERNEL);
+
+ if (!cma_heap)
+ return ERR_PTR(-ENOMEM);
+
+ cma_heap->heap.ops = &ion_cma_ops;
+ /* get device from private heaps data, later it will be
+ * used to make the link with reserved CMA memory */
+ cma_heap->dev = data->priv;
+ cma_heap->heap.type = ION_HEAP_TYPE_DMA;
+ return &cma_heap->heap;
+}
+
+void ion_cma_heap_destroy(struct ion_heap *heap)
+{
+ struct ion_cma_heap *cma_heap = to_cma_heap(heap);
+
+ kfree(cma_heap);
+}
diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
index f541bff..3fc1dcc 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -254,6 +254,9 @@ struct ion_heap *ion_heap_create(struct ion_platform_heap *heap_data)
case ION_HEAP_TYPE_CHUNK:
heap = ion_chunk_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);
@@ -290,6 +293,9 @@ void ion_heap_destroy(struct ion_heap *heap)
case ION_HEAP_TYPE_CHUNK:
ion_chunk_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/staging/android/ion/ion_priv.h b/drivers/staging/android/ion/ion_priv.h
index bdc1e34..f5a09b6 100644
--- a/drivers/staging/android/ion/ion_priv.h
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -270,6 +270,9 @@ void ion_carveout_heap_destroy(struct ion_heap *);

struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *);
void ion_chunk_heap_destroy(struct ion_heap *);
+struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *);
+void ion_cma_heap_destroy(struct ion_heap *);
+
/**
* kernel api to allocate/free from carveout -- used when carveout is
* used to back an architecture specific custom heap
--
1.8.3.2