![Colin Cross](/assets/img/avatar_default.png)
Implement ion_cma_unmap_kernel, ion will call it unconditionally. Use correct gfp flags when calling dma_alloc_coherent so it doesn't try to use atomic DMA memory. Check for invalid alignment when allocating. Reject cached allocations - the cpu address returned by dma_alloc_coherent is always going to be an uncached mapping, so map_kernel will not see data written by a cached userspace mapping. 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>
219 lines
5.5 KiB
C
219 lines
5.5 KiB
C
/*
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* drivers/staging/android/ion/ion_cma_heap.c
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*
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* Copyright (C) Linaro 2012
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* Author: <benjamin.gaignard@linaro.org> for ST-Ericsson.
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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/device.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/dma-mapping.h>
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#include "ion.h"
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#include "ion_priv.h"
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#define ION_CMA_ALLOCATE_FAILED -1
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struct ion_cma_heap {
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struct ion_heap heap;
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struct device *dev;
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};
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#define to_cma_heap(x) container_of(x, struct ion_cma_heap, heap)
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struct ion_cma_buffer_info {
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void *cpu_addr;
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dma_addr_t handle;
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struct sg_table *table;
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};
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/*
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* Create scatter-list for the already allocated DMA buffer.
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* This function could be replaced by dma_common_get_sgtable
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* as soon as it will avalaible.
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*/
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static int ion_cma_get_sgtable(struct device *dev, struct sg_table *sgt,
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void *cpu_addr, dma_addr_t handle, size_t size)
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{
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struct page *page = virt_to_page(cpu_addr);
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int ret;
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ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
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if (unlikely(ret))
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return ret;
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sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
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return 0;
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}
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/* ION CMA heap operations functions */
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static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
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unsigned long len, unsigned long align,
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unsigned long flags)
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{
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struct ion_cma_heap *cma_heap = to_cma_heap(heap);
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struct device *dev = cma_heap->dev;
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struct ion_cma_buffer_info *info;
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dev_dbg(dev, "Request buffer allocation len %ld\n", len);
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if (buffer->flags & ION_FLAG_CACHED)
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return -EINVAL;
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if (align > PAGE_SIZE)
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return -EINVAL;
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info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
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if (!info) {
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dev_err(dev, "Can't allocate buffer info\n");
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return ION_CMA_ALLOCATE_FAILED;
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}
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info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle),
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GFP_HIGHUSER | __GFP_ZERO);
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if (!info->cpu_addr) {
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dev_err(dev, "Fail to allocate buffer\n");
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goto err;
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}
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info->table = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
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if (!info->table) {
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dev_err(dev, "Fail to allocate sg table\n");
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goto free_mem;
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}
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if (ion_cma_get_sgtable
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(dev, info->table, info->cpu_addr, info->handle, len))
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goto free_table;
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/* keep this for memory release */
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buffer->priv_virt = info;
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dev_dbg(dev, "Allocate buffer %p\n", buffer);
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return 0;
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free_table:
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kfree(info->table);
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free_mem:
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dma_free_coherent(dev, len, info->cpu_addr, info->handle);
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err:
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kfree(info);
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return ION_CMA_ALLOCATE_FAILED;
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}
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static void ion_cma_free(struct ion_buffer *buffer)
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{
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struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
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struct device *dev = cma_heap->dev;
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struct ion_cma_buffer_info *info = buffer->priv_virt;
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dev_dbg(dev, "Release buffer %p\n", buffer);
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/* release memory */
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dma_free_coherent(dev, buffer->size, info->cpu_addr, info->handle);
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/* release sg table */
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sg_free_table(info->table);
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kfree(info->table);
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kfree(info);
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}
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/* return physical address in addr */
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static int ion_cma_phys(struct ion_heap *heap, 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 ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
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struct device *dev = cma_heap->dev;
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struct ion_cma_buffer_info *info = buffer->priv_virt;
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dev_dbg(dev, "Return buffer %p physical address 0x%pa\n", buffer,
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&info->handle);
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*addr = info->handle;
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*len = buffer->size;
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return 0;
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}
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static struct sg_table *ion_cma_heap_map_dma(struct ion_heap *heap,
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struct ion_buffer *buffer)
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{
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struct ion_cma_buffer_info *info = buffer->priv_virt;
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return info->table;
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}
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static void ion_cma_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 int ion_cma_mmap(struct ion_heap *mapper, struct ion_buffer *buffer,
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struct vm_area_struct *vma)
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{
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struct ion_cma_heap *cma_heap = to_cma_heap(buffer->heap);
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struct device *dev = cma_heap->dev;
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struct ion_cma_buffer_info *info = buffer->priv_virt;
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return dma_mmap_coherent(dev, vma, info->cpu_addr, info->handle,
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buffer->size);
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}
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static void *ion_cma_map_kernel(struct ion_heap *heap,
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struct ion_buffer *buffer)
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{
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struct ion_cma_buffer_info *info = buffer->priv_virt;
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/* kernel memory mapping has been done at allocation time */
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return info->cpu_addr;
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}
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static void ion_cma_unmap_kernel(struct ion_heap *heap,
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struct ion_buffer *buffer)
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{
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}
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static struct ion_heap_ops ion_cma_ops = {
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.allocate = ion_cma_allocate,
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.free = ion_cma_free,
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.map_dma = ion_cma_heap_map_dma,
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.unmap_dma = ion_cma_heap_unmap_dma,
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.phys = ion_cma_phys,
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.map_user = ion_cma_mmap,
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.map_kernel = ion_cma_map_kernel,
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.unmap_kernel = ion_cma_unmap_kernel,
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};
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struct ion_heap *ion_cma_heap_create(struct ion_platform_heap *data)
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{
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struct ion_cma_heap *cma_heap;
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cma_heap = kzalloc(sizeof(struct ion_cma_heap), GFP_KERNEL);
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if (!cma_heap)
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return ERR_PTR(-ENOMEM);
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cma_heap->heap.ops = &ion_cma_ops;
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/* get device from private heaps data, later it will be
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* used to make the link with reserved CMA memory */
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cma_heap->dev = data->priv;
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cma_heap->heap.type = ION_HEAP_TYPE_DMA;
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return &cma_heap->heap;
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}
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void ion_cma_heap_destroy(struct ion_heap *heap)
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{
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struct ion_cma_heap *cma_heap = to_cma_heap(heap);
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kfree(cma_heap);
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}
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