![Colin Cross](/assets/img/avatar_default.png)
Add ion_heap_pages_zero for ion heaps to use to zero pages during initialization or allocation, when a struct ion_buffer may not be available. Use it from the chunk heap and carveout heaps. Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
195 lines
4.9 KiB
C
195 lines
4.9 KiB
C
/*
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* drivers/staging/android/ion/ion_carveout_heap.c
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*
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* Copyright (C) 2011 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/spinlock.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/genalloc.h>
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#include <linux/io.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "ion.h"
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#include "ion_priv.h"
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struct ion_carveout_heap {
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struct ion_heap heap;
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struct gen_pool *pool;
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ion_phys_addr_t base;
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};
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ion_phys_addr_t ion_carveout_allocate(struct ion_heap *heap,
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unsigned long size,
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unsigned long align)
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{
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struct ion_carveout_heap *carveout_heap =
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container_of(heap, struct ion_carveout_heap, heap);
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unsigned long offset = gen_pool_alloc(carveout_heap->pool, size);
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if (!offset)
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return ION_CARVEOUT_ALLOCATE_FAIL;
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return offset;
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}
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void ion_carveout_free(struct ion_heap *heap, ion_phys_addr_t addr,
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unsigned long size)
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{
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struct ion_carveout_heap *carveout_heap =
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container_of(heap, struct ion_carveout_heap, heap);
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if (addr == ION_CARVEOUT_ALLOCATE_FAIL)
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return;
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gen_pool_free(carveout_heap->pool, addr, size);
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}
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static int ion_carveout_heap_phys(struct ion_heap *heap,
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struct ion_buffer *buffer,
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ion_phys_addr_t *addr, size_t *len)
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{
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struct sg_table *table = buffer->priv_virt;
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struct page *page = sg_page(table->sgl);
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ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
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*addr = paddr;
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*len = buffer->size;
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return 0;
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}
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static int ion_carveout_heap_allocate(struct ion_heap *heap,
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struct ion_buffer *buffer,
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unsigned long size, unsigned long align,
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unsigned long flags)
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{
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struct sg_table *table;
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ion_phys_addr_t paddr;
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int ret;
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if (align > PAGE_SIZE)
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return -EINVAL;
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table = kzalloc(sizeof(struct sg_table), GFP_KERNEL);
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if (!table)
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return -ENOMEM;
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ret = sg_alloc_table(table, 1, GFP_KERNEL);
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if (ret)
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goto err_free;
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paddr = ion_carveout_allocate(heap, size, align);
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if (paddr == ION_CARVEOUT_ALLOCATE_FAIL) {
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ret = -ENOMEM;
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goto err_free_table;
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}
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sg_set_page(table->sgl, pfn_to_page(PFN_DOWN(paddr)), size, 0);
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buffer->priv_virt = table;
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return 0;
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err_free_table:
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sg_free_table(table);
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err_free:
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kfree(table);
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return ret;
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}
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static void ion_carveout_heap_free(struct ion_buffer *buffer)
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{
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struct ion_heap *heap = buffer->heap;
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struct sg_table *table = buffer->priv_virt;
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struct page *page = sg_page(table->sgl);
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ion_phys_addr_t paddr = PFN_PHYS(page_to_pfn(page));
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ion_heap_buffer_zero(buffer);
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if (ion_buffer_cached(buffer))
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dma_sync_sg_for_device(NULL, table->sgl, table->nents,
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DMA_BIDIRECTIONAL);
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ion_carveout_free(heap, paddr, buffer->size);
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sg_free_table(table);
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kfree(table);
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}
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static struct sg_table *ion_carveout_heap_map_dma(struct ion_heap *heap,
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struct ion_buffer *buffer)
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{
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return buffer->priv_virt;
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}
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static void ion_carveout_heap_unmap_dma(struct ion_heap *heap,
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struct ion_buffer *buffer)
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{
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return;
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}
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static struct ion_heap_ops carveout_heap_ops = {
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.allocate = ion_carveout_heap_allocate,
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.free = ion_carveout_heap_free,
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.phys = ion_carveout_heap_phys,
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.map_dma = ion_carveout_heap_map_dma,
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.unmap_dma = ion_carveout_heap_unmap_dma,
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.map_user = ion_heap_map_user,
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.map_kernel = ion_heap_map_kernel,
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.unmap_kernel = ion_heap_unmap_kernel,
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};
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struct ion_heap *ion_carveout_heap_create(struct ion_platform_heap *heap_data)
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{
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struct ion_carveout_heap *carveout_heap;
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int ret;
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struct page *page;
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size_t size;
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page = pfn_to_page(PFN_DOWN(heap_data->base));
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size = heap_data->size;
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ion_pages_sync_for_device(NULL, page, size, DMA_BIDIRECTIONAL);
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ret = ion_heap_pages_zero(page, size, pgprot_writecombine(PAGE_KERNEL));
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if (ret)
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return ERR_PTR(ret);
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carveout_heap = kzalloc(sizeof(struct ion_carveout_heap), GFP_KERNEL);
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if (!carveout_heap)
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return ERR_PTR(-ENOMEM);
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carveout_heap->pool = gen_pool_create(12, -1);
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if (!carveout_heap->pool) {
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kfree(carveout_heap);
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return ERR_PTR(-ENOMEM);
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}
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carveout_heap->base = heap_data->base;
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gen_pool_add(carveout_heap->pool, carveout_heap->base, heap_data->size,
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-1);
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carveout_heap->heap.ops = &carveout_heap_ops;
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carveout_heap->heap.type = ION_HEAP_TYPE_CARVEOUT;
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carveout_heap->heap.flags = ION_HEAP_FLAG_DEFER_FREE;
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return &carveout_heap->heap;
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}
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void ion_carveout_heap_destroy(struct ion_heap *heap)
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{
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struct ion_carveout_heap *carveout_heap =
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container_of(heap, struct ion_carveout_heap, heap);
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gen_pool_destroy(carveout_heap->pool);
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kfree(carveout_heap);
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carveout_heap = NULL;
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}
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