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Subject[PATCH 053/115] gpu: ion: Add chunk heap
Date
From: Rebecca Schultz Zavin <rebecca@android.com>

This patch adds support for a chunk heap that allows for buffers that are
made up of a list of fixed size chunks taken from a carveout. Chunk sizes
are configured when the heaps are created by passing the chunk size in the
priv field of the heap platform data.

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[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 | 5 +
drivers/staging/android/ion/ion_chunk_heap.c | 174 +++++++++++++++++++++++++++
drivers/staging/android/ion/ion_heap.c | 6 +
drivers/staging/android/ion/ion_priv.h | 4 +-
5 files changed, 189 insertions(+), 2 deletions(-)
create mode 100644 drivers/staging/android/ion/ion_chunk_heap.c

diff --git a/drivers/staging/android/ion/Makefile b/drivers/staging/android/ion/Makefile
index d1ddebb..306fff9 100644
--- a/drivers/staging/android/ion/Makefile
+++ b/drivers/staging/android/ion/Makefile
@@ -1,3 +1,3 @@
obj-$(CONFIG_ION) += ion.o ion_heap.o ion_page_pool.o ion_system_heap.o \
- ion_carveout_heap.o
+ ion_carveout_heap.o ion_chunk_heap.o
obj-$(CONFIG_ION_TEGRA) += tegra/
diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
index 072d64d..e5f679f 100644
--- a/drivers/staging/android/ion/ion.h
+++ b/drivers/staging/android/ion/ion.h
@@ -33,6 +33,7 @@ enum ion_heap_type {
ION_HEAP_TYPE_SYSTEM,
ION_HEAP_TYPE_SYSTEM_CONTIG,
ION_HEAP_TYPE_CARVEOUT,
+ ION_HEAP_TYPE_CHUNK,
ION_HEAP_TYPE_CUSTOM, /* must be last so device specific heaps always
are at the end of this enum */
ION_NUM_HEAPS,
@@ -75,6 +76,8 @@ struct ion_buffer;
* @name: used for debug purposes
* @base: base address of heap in physical memory if applicable
* @size: size of the heap in bytes if applicable
+ * @align: required alignment in physical memory if applicable
+ * @priv: private info passed from the board file
*
* Provided by the board file.
*/
@@ -84,6 +87,8 @@ struct ion_platform_heap {
const char *name;
ion_phys_addr_t base;
size_t size;
+ ion_phys_addr_t align;
+ void *priv;
};

/**
diff --git a/drivers/staging/android/ion/ion_chunk_heap.c b/drivers/staging/android/ion/ion_chunk_heap.c
new file mode 100644
index 0000000..1d47409
--- /dev/null
+++ b/drivers/staging/android/ion/ion_chunk_heap.c
@@ -0,0 +1,174 @@
+/*
+ * drivers/staging/android/ion/ion_chunk_heap.c
+ *
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * 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/spinlock.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/genalloc.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/scatterlist.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include "ion.h"
+#include "ion_priv.h"
+
+#include <asm/mach/map.h>
+
+struct ion_chunk_heap {
+ struct ion_heap heap;
+ struct gen_pool *pool;
+ ion_phys_addr_t base;
+ unsigned long chunk_size;
+ unsigned long size;
+ unsigned long allocated;
+};
+
+static int ion_chunk_heap_allocate(struct ion_heap *heap,
+ struct ion_buffer *buffer,
+ unsigned long size, unsigned long align,
+ unsigned long flags)
+{
+ struct ion_chunk_heap *chunk_heap =
+ container_of(heap, struct ion_chunk_heap, heap);
+ struct sg_table *table;
+ struct scatterlist *sg;
+ int ret, i;
+ unsigned long num_chunks;
+
+ if (ion_buffer_fault_user_mappings(buffer))
+ return -ENOMEM;
+
+ num_chunks = ALIGN(size, chunk_heap->chunk_size) /
+ chunk_heap->chunk_size;
+ buffer->size = num_chunks * chunk_heap->chunk_size;
+
+ if (buffer->size > chunk_heap->size - chunk_heap->allocated)
+ return -ENOMEM;
+
+ table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
+ if (!table)
+ return -ENOMEM;
+ ret = sg_alloc_table(table, num_chunks, GFP_KERNEL);
+ if (ret) {
+ kfree(table);
+ return ret;
+ }
+
+ sg = table->sgl;
+ for (i = 0; i < num_chunks; i++) {
+ unsigned long paddr = gen_pool_alloc(chunk_heap->pool,
+ chunk_heap->chunk_size);
+ if (!paddr)
+ goto err;
+ sg_set_page(sg, phys_to_page(paddr), chunk_heap->chunk_size, 0);
+ sg = sg_next(sg);
+ }
+
+ buffer->priv_virt = table;
+ chunk_heap->allocated += buffer->size;
+ return 0;
+err:
+ sg = table->sgl;
+ for (i -= 1; i >= 0; i--) {
+ gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+ sg_dma_len(sg));
+ sg = sg_next(sg);
+ }
+ sg_free_table(table);
+ kfree(table);
+ return -ENOMEM;
+}
+
+static void ion_chunk_heap_free(struct ion_buffer *buffer)
+{
+ struct ion_heap *heap = buffer->heap;
+ struct ion_chunk_heap *chunk_heap =
+ container_of(heap, struct ion_chunk_heap, heap);
+ struct sg_table *table = buffer->priv_virt;
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(table->sgl, sg, table->nents, i) {
+ __dma_page_cpu_to_dev(sg_page(sg), 0, sg_dma_len(sg),
+ DMA_BIDIRECTIONAL);
+ gen_pool_free(chunk_heap->pool, page_to_phys(sg_page(sg)),
+ sg_dma_len(sg));
+ }
+ chunk_heap->allocated -= buffer->size;
+ sg_free_table(table);
+ kfree(table);
+}
+
+struct sg_table *ion_chunk_heap_map_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ return buffer->priv_virt;
+}
+
+void ion_chunk_heap_unmap_dma(struct ion_heap *heap,
+ struct ion_buffer *buffer)
+{
+ return;
+}
+
+static struct ion_heap_ops chunk_heap_ops = {
+ .allocate = ion_chunk_heap_allocate,
+ .free = ion_chunk_heap_free,
+ .map_dma = ion_chunk_heap_map_dma,
+ .unmap_dma = ion_chunk_heap_unmap_dma,
+ .map_user = ion_heap_map_user,
+ .map_kernel = ion_heap_map_kernel,
+ .unmap_kernel = ion_heap_unmap_kernel,
+};
+
+struct ion_heap *ion_chunk_heap_create(struct ion_platform_heap *heap_data)
+{
+ struct ion_chunk_heap *chunk_heap;
+
+ chunk_heap = kzalloc(sizeof(struct ion_chunk_heap), GFP_KERNEL);
+ if (!chunk_heap)
+ return ERR_PTR(-ENOMEM);
+
+ chunk_heap->chunk_size = (unsigned long)heap_data->priv;
+ chunk_heap->pool = gen_pool_create(get_order(chunk_heap->chunk_size) +
+ PAGE_SHIFT, -1);
+ if (!chunk_heap->pool) {
+ kfree(chunk_heap);
+ return ERR_PTR(-ENOMEM);
+ }
+ chunk_heap->base = heap_data->base;
+ chunk_heap->size = heap_data->size;
+ chunk_heap->allocated = 0;
+ __dma_page_cpu_to_dev(phys_to_page(heap_data->base), 0, heap_data->size,
+ DMA_BIDIRECTIONAL);
+ gen_pool_add(chunk_heap->pool, chunk_heap->base, heap_data->size, -1);
+ chunk_heap->heap.ops = &chunk_heap_ops;
+ chunk_heap->heap.type = ION_HEAP_TYPE_CHUNK;
+ pr_info("%s: base %lu size %ld align %ld\n", __func__, chunk_heap->base,
+ heap_data->size, heap_data->align);
+
+ return &chunk_heap->heap;
+}
+
+void ion_chunk_heap_destroy(struct ion_heap *heap)
+{
+ struct ion_chunk_heap *chunk_heap =
+ container_of(heap, struct ion_chunk_heap, heap);
+
+ gen_pool_destroy(chunk_heap->pool);
+ kfree(chunk_heap);
+ chunk_heap = NULL;
+}
diff --git a/drivers/staging/android/ion/ion_heap.c b/drivers/staging/android/ion/ion_heap.c
index 441e9ef..a9bf52e 100644
--- a/drivers/staging/android/ion/ion_heap.c
+++ b/drivers/staging/android/ion/ion_heap.c
@@ -107,6 +107,9 @@ 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_CHUNK:
+ heap = ion_chunk_heap_create(heap_data);
+ break;
default:
pr_err("%s: Invalid heap type %d\n", __func__,
heap_data->type);
@@ -140,6 +143,9 @@ void ion_heap_destroy(struct ion_heap *heap)
case ION_HEAP_TYPE_CARVEOUT:
ion_carveout_heap_destroy(heap);
break;
+ case ION_HEAP_TYPE_CHUNK:
+ ion_chunk_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 6b3616e..eef4de8 100644
--- a/drivers/staging/android/ion/ion_priv.h
+++ b/drivers/staging/android/ion/ion_priv.h
@@ -195,7 +195,6 @@ int ion_heap_map_user(struct ion_heap *, struct ion_buffer *,

struct ion_heap *ion_heap_create(struct ion_platform_heap *);
void ion_heap_destroy(struct ion_heap *);
-
struct ion_heap *ion_system_heap_create(struct ion_platform_heap *);
void ion_system_heap_destroy(struct ion_heap *);

@@ -204,6 +203,9 @@ void ion_system_contig_heap_destroy(struct ion_heap *);

struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *);
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 *);
/**
* kernel api to allocate/free from carveout -- used when carveout is
* used to back an architecture specific custom heap
--
1.8.3.2


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