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Commit 239ab4c6 authored by Rebecca Schultz Zavin's avatar Rebecca Schultz Zavin Committed by Arve Hjønnevåg
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gpu: ion: Add chunk heap 



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.

Change-Id: Ia9e003f727b553a92804264debe119dcf78b14e0
Signed-off-by: default avatarRebecca Schultz Zavin <rebecca@android.com>
parent ba660956

drivers/gpu/ion/Makefile

+1 −1
Original line number Diff line number Diff line 
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/

drivers/gpu/ion/ion_chunk_heap.c

0 → 100644
+174 −0
Original line number Diff line number Diff line 
/*

 * drivers/gpu/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/ion.h>

#include <linux/mm.h>

#include <linux/scatterlist.h>

#include <linux/slab.h>

#include <linux/vmalloc.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;

}

drivers/gpu/ion/ion_heap.c

+6 −0
Original line number Diff line number Diff line
@@ -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);

drivers/gpu/ion/ion_priv.h

+3 −1
Original line number Diff line number Diff line
@@ -194,7 +194,6 @@ 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 *);
@@ -203,6 +202,9 @@ 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

include/linux/ion.h

+5 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 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 = 16,
@@ -77,6 +78,8 @@ 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.

 */
@@ -86,6 +89,8 @@ struct ion_platform_heap { 
	const char *name;

	ion_phys_addr_t base;

	size_t size;

	ion_phys_addr_t align;

	void *priv;

};



/**