1488 lines
36 KiB
C
1488 lines
36 KiB
C
/*
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*
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* drivers/staging/android/ion/ion.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/device.h>
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#include <linux/err.h>
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#include <linux/file.h>
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#include <linux/freezer.h>
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#include <linux/fs.h>
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#include <linux/anon_inodes.h>
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#include <linux/kthread.h>
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#include <linux/list.h>
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#include <linux/memblock.h>
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#include <linux/miscdevice.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/mm_types.h>
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <linux/uaccess.h>
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#include <linux/vmalloc.h>
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#include <linux/debugfs.h>
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#include <linux/dma-buf.h>
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#include <linux/idr.h>
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#include <linux/sched/task.h>
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#include "ion.h"
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#include "ion_priv.h"
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#include "compat_ion.h"
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bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
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{
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return (buffer->flags & ION_FLAG_CACHED) &&
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!(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
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}
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bool ion_buffer_cached(struct ion_buffer *buffer)
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{
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return !!(buffer->flags & ION_FLAG_CACHED);
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}
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static inline struct page *ion_buffer_page(struct page *page)
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{
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return (struct page *)((unsigned long)page & ~(1UL));
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}
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static inline bool ion_buffer_page_is_dirty(struct page *page)
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{
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return !!((unsigned long)page & 1UL);
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}
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static inline void ion_buffer_page_dirty(struct page **page)
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{
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*page = (struct page *)((unsigned long)(*page) | 1UL);
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}
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static inline void ion_buffer_page_clean(struct page **page)
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{
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*page = (struct page *)((unsigned long)(*page) & ~(1UL));
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}
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/* this function should only be called while dev->lock is held */
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static void ion_buffer_add(struct ion_device *dev,
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struct ion_buffer *buffer)
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{
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struct rb_node **p = &dev->buffers.rb_node;
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struct rb_node *parent = NULL;
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struct ion_buffer *entry;
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while (*p) {
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parent = *p;
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entry = rb_entry(parent, struct ion_buffer, node);
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if (buffer < entry) {
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p = &(*p)->rb_left;
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} else if (buffer > entry) {
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p = &(*p)->rb_right;
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} else {
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pr_err("%s: buffer already found.", __func__);
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BUG();
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}
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}
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rb_link_node(&buffer->node, parent, p);
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rb_insert_color(&buffer->node, &dev->buffers);
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}
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/* this function should only be called while dev->lock is held */
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static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
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struct ion_device *dev,
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unsigned long len,
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unsigned long align,
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unsigned long flags)
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{
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struct ion_buffer *buffer;
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struct sg_table *table;
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struct scatterlist *sg;
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int i, ret;
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (!buffer)
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return ERR_PTR(-ENOMEM);
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buffer->heap = heap;
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buffer->flags = flags;
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kref_init(&buffer->ref);
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ret = heap->ops->allocate(heap, buffer, len, align, flags);
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if (ret) {
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if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
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goto err2;
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ion_heap_freelist_drain(heap, 0);
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ret = heap->ops->allocate(heap, buffer, len, align,
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flags);
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if (ret)
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goto err2;
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}
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if (buffer->sg_table == NULL) {
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WARN_ONCE(1, "This heap needs to set the sgtable");
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ret = -EINVAL;
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goto err1;
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}
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table = buffer->sg_table;
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buffer->dev = dev;
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buffer->size = len;
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if (ion_buffer_fault_user_mappings(buffer)) {
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int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
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struct scatterlist *sg;
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int i, j, k = 0;
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buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
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if (!buffer->pages) {
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ret = -ENOMEM;
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goto err1;
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}
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for_each_sg(table->sgl, sg, table->nents, i) {
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struct page *page = sg_page(sg);
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for (j = 0; j < sg->length / PAGE_SIZE; j++)
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buffer->pages[k++] = page++;
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}
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}
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buffer->dev = dev;
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buffer->size = len;
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INIT_LIST_HEAD(&buffer->vmas);
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mutex_init(&buffer->lock);
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/*
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* this will set up dma addresses for the sglist -- it is not
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* technically correct as per the dma api -- a specific
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* device isn't really taking ownership here. However, in practice on
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* our systems the only dma_address space is physical addresses.
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* Additionally, we can't afford the overhead of invalidating every
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* allocation via dma_map_sg. The implicit contract here is that
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* memory coming from the heaps is ready for dma, ie if it has a
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* cached mapping that mapping has been invalidated
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*/
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for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i) {
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sg_dma_address(sg) = sg_phys(sg);
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sg_dma_len(sg) = sg->length;
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}
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mutex_lock(&dev->buffer_lock);
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ion_buffer_add(dev, buffer);
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mutex_unlock(&dev->buffer_lock);
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return buffer;
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err1:
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heap->ops->free(buffer);
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err2:
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kfree(buffer);
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return ERR_PTR(ret);
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}
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void ion_buffer_destroy(struct ion_buffer *buffer)
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{
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if (WARN_ON(buffer->kmap_cnt > 0))
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buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
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buffer->heap->ops->free(buffer);
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vfree(buffer->pages);
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kfree(buffer);
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}
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static void _ion_buffer_destroy(struct kref *kref)
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{
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struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
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struct ion_heap *heap = buffer->heap;
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struct ion_device *dev = buffer->dev;
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mutex_lock(&dev->buffer_lock);
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rb_erase(&buffer->node, &dev->buffers);
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mutex_unlock(&dev->buffer_lock);
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if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
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ion_heap_freelist_add(heap, buffer);
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else
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ion_buffer_destroy(buffer);
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}
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static void ion_buffer_get(struct ion_buffer *buffer)
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{
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kref_get(&buffer->ref);
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}
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static int ion_buffer_put(struct ion_buffer *buffer)
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{
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return kref_put(&buffer->ref, _ion_buffer_destroy);
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}
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static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
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{
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mutex_lock(&buffer->lock);
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buffer->handle_count++;
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mutex_unlock(&buffer->lock);
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}
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static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
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{
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/*
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* when a buffer is removed from a handle, if it is not in
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* any other handles, copy the taskcomm and the pid of the
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* process it's being removed from into the buffer. At this
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* point there will be no way to track what processes this buffer is
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* being used by, it only exists as a dma_buf file descriptor.
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* The taskcomm and pid can provide a debug hint as to where this fd
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* is in the system
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*/
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mutex_lock(&buffer->lock);
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buffer->handle_count--;
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BUG_ON(buffer->handle_count < 0);
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if (!buffer->handle_count) {
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struct task_struct *task;
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task = current->group_leader;
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get_task_comm(buffer->task_comm, task);
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buffer->pid = task_pid_nr(task);
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}
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mutex_unlock(&buffer->lock);
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}
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static struct ion_handle *ion_handle_create(struct ion_client *client,
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struct ion_buffer *buffer)
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{
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struct ion_handle *handle;
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handle = kzalloc(sizeof(*handle), GFP_KERNEL);
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if (!handle)
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return ERR_PTR(-ENOMEM);
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kref_init(&handle->ref);
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RB_CLEAR_NODE(&handle->node);
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handle->client = client;
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ion_buffer_get(buffer);
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ion_buffer_add_to_handle(buffer);
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handle->buffer = buffer;
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return handle;
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}
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static void ion_handle_kmap_put(struct ion_handle *);
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static void ion_handle_destroy(struct kref *kref)
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{
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struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
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struct ion_client *client = handle->client;
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struct ion_buffer *buffer = handle->buffer;
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mutex_lock(&buffer->lock);
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while (handle->kmap_cnt)
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ion_handle_kmap_put(handle);
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mutex_unlock(&buffer->lock);
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idr_remove(&client->idr, handle->id);
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if (!RB_EMPTY_NODE(&handle->node))
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rb_erase(&handle->node, &client->handles);
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ion_buffer_remove_from_handle(buffer);
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ion_buffer_put(buffer);
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kfree(handle);
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}
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static void ion_handle_get(struct ion_handle *handle)
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{
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kref_get(&handle->ref);
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}
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int ion_handle_put_nolock(struct ion_handle *handle)
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{
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return kref_put(&handle->ref, ion_handle_destroy);
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}
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int ion_handle_put(struct ion_handle *handle)
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{
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struct ion_client *client = handle->client;
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int ret;
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mutex_lock(&client->lock);
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ret = ion_handle_put_nolock(handle);
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mutex_unlock(&client->lock);
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return ret;
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}
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static struct ion_handle *ion_handle_lookup(struct ion_client *client,
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struct ion_buffer *buffer)
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{
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struct rb_node *n = client->handles.rb_node;
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while (n) {
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struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
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if (buffer < entry->buffer)
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n = n->rb_left;
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else if (buffer > entry->buffer)
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n = n->rb_right;
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else
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return entry;
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}
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return ERR_PTR(-EINVAL);
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}
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struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
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int id)
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{
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struct ion_handle *handle;
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handle = idr_find(&client->idr, id);
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if (handle)
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ion_handle_get(handle);
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return handle ? handle : ERR_PTR(-EINVAL);
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}
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struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
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int id)
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{
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struct ion_handle *handle;
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mutex_lock(&client->lock);
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handle = ion_handle_get_by_id_nolock(client, id);
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mutex_unlock(&client->lock);
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return handle;
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}
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static bool ion_handle_validate(struct ion_client *client,
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struct ion_handle *handle)
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{
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WARN_ON(!mutex_is_locked(&client->lock));
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return idr_find(&client->idr, handle->id) == handle;
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}
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static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
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{
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int id;
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struct rb_node **p = &client->handles.rb_node;
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struct rb_node *parent = NULL;
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struct ion_handle *entry;
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id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
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if (id < 0)
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return id;
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handle->id = id;
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while (*p) {
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parent = *p;
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entry = rb_entry(parent, struct ion_handle, node);
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if (handle->buffer < entry->buffer)
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p = &(*p)->rb_left;
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else if (handle->buffer > entry->buffer)
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p = &(*p)->rb_right;
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else
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WARN(1, "%s: buffer already found.", __func__);
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}
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rb_link_node(&handle->node, parent, p);
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rb_insert_color(&handle->node, &client->handles);
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return 0;
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}
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struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
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size_t align, unsigned int heap_id_mask,
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unsigned int flags)
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{
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struct ion_handle *handle;
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struct ion_device *dev = client->dev;
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struct ion_buffer *buffer = NULL;
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struct ion_heap *heap;
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int ret;
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pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
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len, align, heap_id_mask, flags);
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/*
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* traverse the list of heaps available in this system in priority
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* order. If the heap type is supported by the client, and matches the
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* request of the caller allocate from it. Repeat until allocate has
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* succeeded or all heaps have been tried
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*/
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len = PAGE_ALIGN(len);
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|
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if (!len)
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return ERR_PTR(-EINVAL);
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|
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down_read(&dev->lock);
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plist_for_each_entry(heap, &dev->heaps, node) {
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/* if the caller didn't specify this heap id */
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if (!((1 << heap->id) & heap_id_mask))
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continue;
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buffer = ion_buffer_create(heap, dev, len, align, flags);
|
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if (!IS_ERR(buffer))
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break;
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}
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up_read(&dev->lock);
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|
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if (buffer == NULL)
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return ERR_PTR(-ENODEV);
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|
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if (IS_ERR(buffer))
|
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return ERR_CAST(buffer);
|
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|
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handle = ion_handle_create(client, buffer);
|
|
|
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/*
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* ion_buffer_create will create a buffer with a ref_cnt of 1,
|
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* and ion_handle_create will take a second reference, drop one here
|
|
*/
|
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ion_buffer_put(buffer);
|
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|
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if (IS_ERR(handle))
|
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return handle;
|
|
|
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mutex_lock(&client->lock);
|
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ret = ion_handle_add(client, handle);
|
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mutex_unlock(&client->lock);
|
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if (ret) {
|
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ion_handle_put(handle);
|
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handle = ERR_PTR(ret);
|
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}
|
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|
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return handle;
|
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}
|
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EXPORT_SYMBOL(ion_alloc);
|
|
|
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void ion_free_nolock(struct ion_client *client,
|
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struct ion_handle *handle)
|
|
{
|
|
if (!ion_handle_validate(client, handle)) {
|
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WARN(1, "%s: invalid handle passed to free.\n", __func__);
|
|
return;
|
|
}
|
|
ion_handle_put_nolock(handle);
|
|
}
|
|
|
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void ion_free(struct ion_client *client, struct ion_handle *handle)
|
|
{
|
|
BUG_ON(client != handle->client);
|
|
|
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mutex_lock(&client->lock);
|
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ion_free_nolock(client, handle);
|
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mutex_unlock(&client->lock);
|
|
}
|
|
EXPORT_SYMBOL(ion_free);
|
|
|
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static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
|
|
{
|
|
void *vaddr;
|
|
|
|
if (buffer->kmap_cnt) {
|
|
buffer->kmap_cnt++;
|
|
return buffer->vaddr;
|
|
}
|
|
vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
|
|
if (WARN_ONCE(vaddr == NULL,
|
|
"heap->ops->map_kernel should return ERR_PTR on error"))
|
|
return ERR_PTR(-EINVAL);
|
|
if (IS_ERR(vaddr))
|
|
return vaddr;
|
|
buffer->vaddr = vaddr;
|
|
buffer->kmap_cnt++;
|
|
return vaddr;
|
|
}
|
|
|
|
static void *ion_handle_kmap_get(struct ion_handle *handle)
|
|
{
|
|
struct ion_buffer *buffer = handle->buffer;
|
|
void *vaddr;
|
|
|
|
if (handle->kmap_cnt) {
|
|
handle->kmap_cnt++;
|
|
return buffer->vaddr;
|
|
}
|
|
vaddr = ion_buffer_kmap_get(buffer);
|
|
if (IS_ERR(vaddr))
|
|
return vaddr;
|
|
handle->kmap_cnt++;
|
|
return vaddr;
|
|
}
|
|
|
|
static void ion_buffer_kmap_put(struct ion_buffer *buffer)
|
|
{
|
|
buffer->kmap_cnt--;
|
|
if (!buffer->kmap_cnt) {
|
|
buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
|
|
buffer->vaddr = NULL;
|
|
}
|
|
}
|
|
|
|
static void ion_handle_kmap_put(struct ion_handle *handle)
|
|
{
|
|
struct ion_buffer *buffer = handle->buffer;
|
|
|
|
if (!handle->kmap_cnt) {
|
|
WARN(1, "%s: Double unmap detected! bailing...\n", __func__);
|
|
return;
|
|
}
|
|
handle->kmap_cnt--;
|
|
if (!handle->kmap_cnt)
|
|
ion_buffer_kmap_put(buffer);
|
|
}
|
|
|
|
void *ion_map_kernel(struct ion_client *client, struct ion_handle *handle)
|
|
{
|
|
struct ion_buffer *buffer;
|
|
void *vaddr;
|
|
|
|
mutex_lock(&client->lock);
|
|
if (!ion_handle_validate(client, handle)) {
|
|
pr_err("%s: invalid handle passed to map_kernel.\n",
|
|
__func__);
|
|
mutex_unlock(&client->lock);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
buffer = handle->buffer;
|
|
|
|
if (!handle->buffer->heap->ops->map_kernel) {
|
|
pr_err("%s: map_kernel is not implemented by this heap.\n",
|
|
__func__);
|
|
mutex_unlock(&client->lock);
|
|
return ERR_PTR(-ENODEV);
|
|
}
|
|
|
|
mutex_lock(&buffer->lock);
|
|
vaddr = ion_handle_kmap_get(handle);
|
|
mutex_unlock(&buffer->lock);
|
|
mutex_unlock(&client->lock);
|
|
return vaddr;
|
|
}
|
|
EXPORT_SYMBOL(ion_map_kernel);
|
|
|
|
void ion_unmap_kernel(struct ion_client *client, struct ion_handle *handle)
|
|
{
|
|
struct ion_buffer *buffer;
|
|
|
|
mutex_lock(&client->lock);
|
|
buffer = handle->buffer;
|
|
mutex_lock(&buffer->lock);
|
|
ion_handle_kmap_put(handle);
|
|
mutex_unlock(&buffer->lock);
|
|
mutex_unlock(&client->lock);
|
|
}
|
|
EXPORT_SYMBOL(ion_unmap_kernel);
|
|
|
|
static struct mutex debugfs_mutex;
|
|
static struct rb_root *ion_root_client;
|
|
static int is_client_alive(struct ion_client *client)
|
|
{
|
|
struct rb_node *node;
|
|
struct ion_client *tmp;
|
|
struct ion_device *dev;
|
|
|
|
node = ion_root_client->rb_node;
|
|
dev = container_of(ion_root_client, struct ion_device, clients);
|
|
|
|
down_read(&dev->lock);
|
|
while (node) {
|
|
tmp = rb_entry(node, struct ion_client, node);
|
|
if (client < tmp) {
|
|
node = node->rb_left;
|
|
} else if (client > tmp) {
|
|
node = node->rb_right;
|
|
} else {
|
|
up_read(&dev->lock);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
up_read(&dev->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int ion_debug_client_show(struct seq_file *s, void *unused)
|
|
{
|
|
struct ion_client *client = s->private;
|
|
struct rb_node *n;
|
|
size_t sizes[ION_NUM_HEAP_IDS] = {0};
|
|
const char *names[ION_NUM_HEAP_IDS] = {NULL};
|
|
int i;
|
|
|
|
mutex_lock(&debugfs_mutex);
|
|
if (!is_client_alive(client)) {
|
|
seq_printf(s, "ion_client 0x%p dead, can't dump its buffers\n",
|
|
client);
|
|
mutex_unlock(&debugfs_mutex);
|
|
return 0;
|
|
}
|
|
|
|
mutex_lock(&client->lock);
|
|
for (n = rb_first(&client->handles); n; n = rb_next(n)) {
|
|
struct ion_handle *handle = rb_entry(n, struct ion_handle,
|
|
node);
|
|
unsigned int id = handle->buffer->heap->id;
|
|
|
|
if (!names[id])
|
|
names[id] = handle->buffer->heap->name;
|
|
sizes[id] += handle->buffer->size;
|
|
}
|
|
mutex_unlock(&client->lock);
|
|
mutex_unlock(&debugfs_mutex);
|
|
|
|
seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
|
|
for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
|
|
if (!names[i])
|
|
continue;
|
|
seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int ion_debug_client_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, ion_debug_client_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations debug_client_fops = {
|
|
.open = ion_debug_client_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int ion_get_client_serial(const struct rb_root *root,
|
|
const unsigned char *name)
|
|
{
|
|
int serial = -1;
|
|
struct rb_node *node;
|
|
|
|
for (node = rb_first(root); node; node = rb_next(node)) {
|
|
struct ion_client *client = rb_entry(node, struct ion_client,
|
|
node);
|
|
|
|
if (strcmp(client->name, name))
|
|
continue;
|
|
serial = max(serial, client->display_serial);
|
|
}
|
|
return serial + 1;
|
|
}
|
|
|
|
struct ion_client *ion_client_create(struct ion_device *dev,
|
|
const char *name)
|
|
{
|
|
struct ion_client *client;
|
|
struct task_struct *task;
|
|
struct rb_node **p;
|
|
struct rb_node *parent = NULL;
|
|
struct ion_client *entry;
|
|
pid_t pid;
|
|
|
|
if (!name) {
|
|
pr_err("%s: Name cannot be null\n", __func__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
get_task_struct(current->group_leader);
|
|
task_lock(current->group_leader);
|
|
pid = task_pid_nr(current->group_leader);
|
|
/*
|
|
* don't bother to store task struct for kernel threads,
|
|
* they can't be killed anyway
|
|
*/
|
|
if (current->group_leader->flags & PF_KTHREAD) {
|
|
put_task_struct(current->group_leader);
|
|
task = NULL;
|
|
} else {
|
|
task = current->group_leader;
|
|
}
|
|
task_unlock(current->group_leader);
|
|
|
|
client = kzalloc(sizeof(*client), GFP_KERNEL);
|
|
if (!client)
|
|
goto err_put_task_struct;
|
|
|
|
client->dev = dev;
|
|
client->handles = RB_ROOT;
|
|
idr_init(&client->idr);
|
|
mutex_init(&client->lock);
|
|
client->task = task;
|
|
client->pid = pid;
|
|
client->name = kstrdup(name, GFP_KERNEL);
|
|
if (!client->name)
|
|
goto err_free_client;
|
|
|
|
down_write(&dev->lock);
|
|
client->display_serial = ion_get_client_serial(&dev->clients, name);
|
|
client->display_name = kasprintf(
|
|
GFP_KERNEL, "%s-%d", name, client->display_serial);
|
|
if (!client->display_name) {
|
|
up_write(&dev->lock);
|
|
goto err_free_client_name;
|
|
}
|
|
p = &dev->clients.rb_node;
|
|
while (*p) {
|
|
parent = *p;
|
|
entry = rb_entry(parent, struct ion_client, node);
|
|
|
|
if (client < entry)
|
|
p = &(*p)->rb_left;
|
|
else if (client > entry)
|
|
p = &(*p)->rb_right;
|
|
}
|
|
rb_link_node(&client->node, parent, p);
|
|
rb_insert_color(&client->node, &dev->clients);
|
|
|
|
client->debug_root = debugfs_create_file(client->display_name, 0664,
|
|
dev->clients_debug_root,
|
|
client, &debug_client_fops);
|
|
if (!client->debug_root) {
|
|
char buf[256], *path;
|
|
|
|
path = dentry_path(dev->clients_debug_root, buf, 256);
|
|
pr_err("Failed to create client debugfs at %s/%s\n",
|
|
path, client->display_name);
|
|
}
|
|
|
|
up_write(&dev->lock);
|
|
|
|
return client;
|
|
|
|
err_free_client_name:
|
|
kfree(client->name);
|
|
err_free_client:
|
|
kfree(client);
|
|
err_put_task_struct:
|
|
if (task)
|
|
put_task_struct(current->group_leader);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
EXPORT_SYMBOL(ion_client_create);
|
|
|
|
void ion_client_destroy(struct ion_client *client)
|
|
{
|
|
struct ion_device *dev = client->dev;
|
|
struct rb_node *n;
|
|
|
|
pr_debug("%s: %d\n", __func__, __LINE__);
|
|
mutex_lock(&debugfs_mutex);
|
|
while ((n = rb_first(&client->handles))) {
|
|
struct ion_handle *handle = rb_entry(n, struct ion_handle,
|
|
node);
|
|
ion_handle_destroy(&handle->ref);
|
|
}
|
|
|
|
idr_destroy(&client->idr);
|
|
|
|
down_write(&dev->lock);
|
|
if (client->task)
|
|
put_task_struct(client->task);
|
|
rb_erase(&client->node, &dev->clients);
|
|
debugfs_remove_recursive(client->debug_root);
|
|
up_write(&dev->lock);
|
|
|
|
kfree(client->display_name);
|
|
kfree(client->name);
|
|
kfree(client);
|
|
mutex_unlock(&debugfs_mutex);
|
|
}
|
|
EXPORT_SYMBOL(ion_client_destroy);
|
|
|
|
static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
|
|
struct device *dev,
|
|
enum dma_data_direction direction);
|
|
|
|
static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct dma_buf *dmabuf = attachment->dmabuf;
|
|
struct ion_buffer *buffer = dmabuf->priv;
|
|
|
|
ion_buffer_sync_for_device(buffer, attachment->dev, direction);
|
|
return buffer->sg_table;
|
|
}
|
|
|
|
static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
|
|
struct sg_table *table,
|
|
enum dma_data_direction direction)
|
|
{
|
|
}
|
|
|
|
void ion_pages_sync_for_device(struct device *dev, struct page *page,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
struct scatterlist sg;
|
|
|
|
sg_init_table(&sg, 1);
|
|
sg_set_page(&sg, page, size, 0);
|
|
/*
|
|
* This is not correct - sg_dma_address needs a dma_addr_t that is valid
|
|
* for the targeted device, but this works on the currently targeted
|
|
* hardware.
|
|
*/
|
|
sg_dma_address(&sg) = page_to_phys(page);
|
|
dma_sync_sg_for_device(dev, &sg, 1, dir);
|
|
}
|
|
|
|
struct ion_vma_list {
|
|
struct list_head list;
|
|
struct vm_area_struct *vma;
|
|
};
|
|
|
|
static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
|
|
struct device *dev,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct ion_vma_list *vma_list;
|
|
int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
|
|
int i;
|
|
|
|
pr_debug("%s: syncing for device %s\n", __func__,
|
|
dev ? dev_name(dev) : "null");
|
|
|
|
if (!ion_buffer_fault_user_mappings(buffer))
|
|
return;
|
|
|
|
mutex_lock(&buffer->lock);
|
|
for (i = 0; i < pages; i++) {
|
|
struct page *page = buffer->pages[i];
|
|
|
|
if (ion_buffer_page_is_dirty(page))
|
|
ion_pages_sync_for_device(dev, ion_buffer_page(page),
|
|
PAGE_SIZE, dir);
|
|
|
|
ion_buffer_page_clean(buffer->pages + i);
|
|
}
|
|
list_for_each_entry(vma_list, &buffer->vmas, list) {
|
|
struct vm_area_struct *vma = vma_list->vma;
|
|
|
|
zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start);
|
|
}
|
|
mutex_unlock(&buffer->lock);
|
|
}
|
|
|
|
static int ion_vm_fault(struct vm_fault *vmf)
|
|
{
|
|
struct ion_buffer *buffer = vmf->vma->vm_private_data;
|
|
unsigned long pfn;
|
|
int ret;
|
|
|
|
mutex_lock(&buffer->lock);
|
|
ion_buffer_page_dirty(buffer->pages + vmf->pgoff);
|
|
BUG_ON(!buffer->pages || !buffer->pages[vmf->pgoff]);
|
|
|
|
pfn = page_to_pfn(ion_buffer_page(buffer->pages[vmf->pgoff]));
|
|
ret = vm_insert_pfn(vmf->vma, vmf->address, pfn);
|
|
mutex_unlock(&buffer->lock);
|
|
if (ret)
|
|
return VM_FAULT_ERROR;
|
|
|
|
return VM_FAULT_NOPAGE;
|
|
}
|
|
|
|
static void ion_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct ion_buffer *buffer = vma->vm_private_data;
|
|
struct ion_vma_list *vma_list;
|
|
|
|
vma_list = kmalloc(sizeof(*vma_list), GFP_KERNEL);
|
|
if (!vma_list)
|
|
return;
|
|
vma_list->vma = vma;
|
|
mutex_lock(&buffer->lock);
|
|
list_add(&vma_list->list, &buffer->vmas);
|
|
mutex_unlock(&buffer->lock);
|
|
pr_debug("%s: adding %p\n", __func__, vma);
|
|
}
|
|
|
|
static void ion_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct ion_buffer *buffer = vma->vm_private_data;
|
|
struct ion_vma_list *vma_list, *tmp;
|
|
|
|
pr_debug("%s\n", __func__);
|
|
mutex_lock(&buffer->lock);
|
|
list_for_each_entry_safe(vma_list, tmp, &buffer->vmas, list) {
|
|
if (vma_list->vma != vma)
|
|
continue;
|
|
list_del(&vma_list->list);
|
|
kfree(vma_list);
|
|
pr_debug("%s: deleting %p\n", __func__, vma);
|
|
break;
|
|
}
|
|
mutex_unlock(&buffer->lock);
|
|
}
|
|
|
|
static const struct vm_operations_struct ion_vma_ops = {
|
|
.open = ion_vm_open,
|
|
.close = ion_vm_close,
|
|
.fault = ion_vm_fault,
|
|
};
|
|
|
|
static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
|
|
{
|
|
struct ion_buffer *buffer = dmabuf->priv;
|
|
int ret = 0;
|
|
|
|
if (!buffer->heap->ops->map_user) {
|
|
pr_err("%s: this heap does not define a method for mapping to userspace\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (ion_buffer_fault_user_mappings(buffer)) {
|
|
vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND |
|
|
VM_DONTDUMP;
|
|
vma->vm_private_data = buffer;
|
|
vma->vm_ops = &ion_vma_ops;
|
|
ion_vm_open(vma);
|
|
return 0;
|
|
}
|
|
|
|
if (!(buffer->flags & ION_FLAG_CACHED))
|
|
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
|
|
|
|
mutex_lock(&buffer->lock);
|
|
/* now map it to userspace */
|
|
ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma);
|
|
mutex_unlock(&buffer->lock);
|
|
|
|
if (ret)
|
|
pr_err("%s: failure mapping buffer to userspace\n",
|
|
__func__);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void ion_dma_buf_release(struct dma_buf *dmabuf)
|
|
{
|
|
struct ion_buffer *buffer = dmabuf->priv;
|
|
|
|
ion_buffer_put(buffer);
|
|
}
|
|
|
|
static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
|
|
{
|
|
struct ion_buffer *buffer = dmabuf->priv;
|
|
|
|
return buffer->vaddr + offset * PAGE_SIZE;
|
|
}
|
|
|
|
static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset,
|
|
void *ptr)
|
|
{
|
|
}
|
|
|
|
static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct ion_buffer *buffer = dmabuf->priv;
|
|
void *vaddr;
|
|
|
|
if (!buffer->heap->ops->map_kernel) {
|
|
pr_err("%s: map kernel is not implemented by this heap.\n",
|
|
__func__);
|
|
return -ENODEV;
|
|
}
|
|
|
|
mutex_lock(&buffer->lock);
|
|
vaddr = ion_buffer_kmap_get(buffer);
|
|
mutex_unlock(&buffer->lock);
|
|
return PTR_ERR_OR_ZERO(vaddr);
|
|
}
|
|
|
|
static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
|
|
enum dma_data_direction direction)
|
|
{
|
|
struct ion_buffer *buffer = dmabuf->priv;
|
|
|
|
mutex_lock(&buffer->lock);
|
|
ion_buffer_kmap_put(buffer);
|
|
mutex_unlock(&buffer->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct dma_buf_ops dma_buf_ops = {
|
|
.map_dma_buf = ion_map_dma_buf,
|
|
.unmap_dma_buf = ion_unmap_dma_buf,
|
|
.mmap = ion_mmap,
|
|
.release = ion_dma_buf_release,
|
|
.begin_cpu_access = ion_dma_buf_begin_cpu_access,
|
|
.end_cpu_access = ion_dma_buf_end_cpu_access,
|
|
.kmap_atomic = ion_dma_buf_kmap,
|
|
.kunmap_atomic = ion_dma_buf_kunmap,
|
|
.kmap = ion_dma_buf_kmap,
|
|
.kunmap = ion_dma_buf_kunmap,
|
|
};
|
|
|
|
struct dma_buf *ion_share_dma_buf(struct ion_client *client,
|
|
struct ion_handle *handle)
|
|
{
|
|
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
|
|
struct ion_buffer *buffer;
|
|
struct dma_buf *dmabuf;
|
|
bool valid_handle;
|
|
|
|
mutex_lock(&client->lock);
|
|
valid_handle = ion_handle_validate(client, handle);
|
|
if (!valid_handle) {
|
|
WARN(1, "%s: invalid handle passed to share.\n", __func__);
|
|
mutex_unlock(&client->lock);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
buffer = handle->buffer;
|
|
ion_buffer_get(buffer);
|
|
mutex_unlock(&client->lock);
|
|
|
|
exp_info.ops = &dma_buf_ops;
|
|
exp_info.size = buffer->size;
|
|
exp_info.flags = O_RDWR;
|
|
exp_info.priv = buffer;
|
|
|
|
dmabuf = dma_buf_export(&exp_info);
|
|
if (IS_ERR(dmabuf)) {
|
|
ion_buffer_put(buffer);
|
|
return dmabuf;
|
|
}
|
|
|
|
return dmabuf;
|
|
}
|
|
EXPORT_SYMBOL(ion_share_dma_buf);
|
|
|
|
int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
|
|
{
|
|
struct dma_buf *dmabuf;
|
|
int fd;
|
|
|
|
dmabuf = ion_share_dma_buf(client, handle);
|
|
if (IS_ERR(dmabuf))
|
|
return PTR_ERR(dmabuf);
|
|
|
|
fd = dma_buf_fd(dmabuf, O_CLOEXEC);
|
|
if (fd < 0)
|
|
dma_buf_put(dmabuf);
|
|
|
|
return fd;
|
|
}
|
|
EXPORT_SYMBOL(ion_share_dma_buf_fd);
|
|
|
|
struct ion_handle *ion_import_dma_buf(struct ion_client *client,
|
|
struct dma_buf *dmabuf)
|
|
{
|
|
struct ion_buffer *buffer;
|
|
struct ion_handle *handle;
|
|
int ret;
|
|
|
|
/* if this memory came from ion */
|
|
|
|
if (dmabuf->ops != &dma_buf_ops) {
|
|
pr_err("%s: can not import dmabuf from another exporter\n",
|
|
__func__);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
buffer = dmabuf->priv;
|
|
|
|
mutex_lock(&client->lock);
|
|
/* if a handle exists for this buffer just take a reference to it */
|
|
handle = ion_handle_lookup(client, buffer);
|
|
if (!IS_ERR(handle)) {
|
|
ion_handle_get(handle);
|
|
mutex_unlock(&client->lock);
|
|
goto end;
|
|
}
|
|
|
|
handle = ion_handle_create(client, buffer);
|
|
if (IS_ERR(handle)) {
|
|
mutex_unlock(&client->lock);
|
|
goto end;
|
|
}
|
|
|
|
ret = ion_handle_add(client, handle);
|
|
mutex_unlock(&client->lock);
|
|
if (ret) {
|
|
ion_handle_put(handle);
|
|
handle = ERR_PTR(ret);
|
|
}
|
|
|
|
end:
|
|
return handle;
|
|
}
|
|
EXPORT_SYMBOL(ion_import_dma_buf);
|
|
|
|
struct ion_handle *ion_import_dma_buf_fd(struct ion_client *client, int fd)
|
|
{
|
|
struct dma_buf *dmabuf;
|
|
struct ion_handle *handle;
|
|
|
|
dmabuf = dma_buf_get(fd);
|
|
if (IS_ERR(dmabuf))
|
|
return ERR_CAST(dmabuf);
|
|
|
|
handle = ion_import_dma_buf(client, dmabuf);
|
|
dma_buf_put(dmabuf);
|
|
return handle;
|
|
}
|
|
EXPORT_SYMBOL(ion_import_dma_buf_fd);
|
|
|
|
int ion_sync_for_device(struct ion_client *client, int fd)
|
|
{
|
|
struct dma_buf *dmabuf;
|
|
struct ion_buffer *buffer;
|
|
|
|
dmabuf = dma_buf_get(fd);
|
|
if (IS_ERR(dmabuf))
|
|
return PTR_ERR(dmabuf);
|
|
|
|
/* if this memory came from ion */
|
|
if (dmabuf->ops != &dma_buf_ops) {
|
|
pr_err("%s: can not sync dmabuf from another exporter\n",
|
|
__func__);
|
|
dma_buf_put(dmabuf);
|
|
return -EINVAL;
|
|
}
|
|
buffer = dmabuf->priv;
|
|
|
|
dma_sync_sg_for_device(NULL, buffer->sg_table->sgl,
|
|
buffer->sg_table->nents, DMA_BIDIRECTIONAL);
|
|
dma_buf_put(dmabuf);
|
|
return 0;
|
|
}
|
|
|
|
int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
|
|
{
|
|
struct ion_device *dev = client->dev;
|
|
struct ion_heap_data __user *buffer = u64_to_user_ptr(query->heaps);
|
|
int ret = -EINVAL, cnt = 0, max_cnt;
|
|
struct ion_heap *heap;
|
|
struct ion_heap_data hdata;
|
|
|
|
memset(&hdata, 0, sizeof(hdata));
|
|
|
|
down_read(&dev->lock);
|
|
if (!buffer) {
|
|
query->cnt = dev->heap_cnt;
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (query->cnt <= 0)
|
|
goto out;
|
|
|
|
max_cnt = query->cnt;
|
|
|
|
plist_for_each_entry(heap, &dev->heaps, node) {
|
|
strncpy(hdata.name, heap->name, MAX_HEAP_NAME);
|
|
hdata.name[sizeof(hdata.name) - 1] = '\0';
|
|
hdata.type = heap->type;
|
|
hdata.heap_id = heap->id;
|
|
|
|
if (copy_to_user(&buffer[cnt], &hdata, sizeof(hdata))) {
|
|
ret = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
cnt++;
|
|
if (cnt >= max_cnt)
|
|
break;
|
|
}
|
|
|
|
query->cnt = cnt;
|
|
out:
|
|
up_read(&dev->lock);
|
|
return ret;
|
|
}
|
|
|
|
static int ion_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct ion_client *client = file->private_data;
|
|
|
|
pr_debug("%s: %d\n", __func__, __LINE__);
|
|
ion_client_destroy(client);
|
|
return 0;
|
|
}
|
|
|
|
static int ion_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct miscdevice *miscdev = file->private_data;
|
|
struct ion_device *dev = container_of(miscdev, struct ion_device, dev);
|
|
struct ion_client *client;
|
|
char debug_name[64];
|
|
|
|
pr_debug("%s: %d\n", __func__, __LINE__);
|
|
snprintf(debug_name, 64, "%u", task_pid_nr(current->group_leader));
|
|
client = ion_client_create(dev, debug_name);
|
|
if (IS_ERR(client))
|
|
return PTR_ERR(client);
|
|
file->private_data = client;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations ion_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ion_open,
|
|
.release = ion_release,
|
|
.unlocked_ioctl = ion_ioctl,
|
|
.compat_ioctl = compat_ion_ioctl,
|
|
};
|
|
|
|
static size_t ion_debug_heap_total(struct ion_client *client,
|
|
unsigned int id)
|
|
{
|
|
size_t size = 0;
|
|
struct rb_node *n;
|
|
|
|
mutex_lock(&client->lock);
|
|
for (n = rb_first(&client->handles); n; n = rb_next(n)) {
|
|
struct ion_handle *handle = rb_entry(n,
|
|
struct ion_handle,
|
|
node);
|
|
if (handle->buffer->heap->id == id)
|
|
size += handle->buffer->size;
|
|
}
|
|
mutex_unlock(&client->lock);
|
|
return size;
|
|
}
|
|
|
|
static int ion_debug_heap_show(struct seq_file *s, void *unused)
|
|
{
|
|
struct ion_heap *heap = s->private;
|
|
struct ion_device *dev = heap->dev;
|
|
struct rb_node *n;
|
|
size_t total_size = 0;
|
|
size_t total_orphaned_size = 0;
|
|
|
|
seq_printf(s, "%16s %16s %16s\n", "client", "pid", "size");
|
|
seq_puts(s, "----------------------------------------------------\n");
|
|
|
|
mutex_lock(&debugfs_mutex);
|
|
for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
|
|
struct ion_client *client = rb_entry(n, struct ion_client,
|
|
node);
|
|
size_t size = ion_debug_heap_total(client, heap->id);
|
|
|
|
if (!size)
|
|
continue;
|
|
if (client->task) {
|
|
char task_comm[TASK_COMM_LEN];
|
|
|
|
get_task_comm(task_comm, client->task);
|
|
seq_printf(s, "%16s %16u %16zu\n", task_comm,
|
|
client->pid, size);
|
|
} else {
|
|
seq_printf(s, "%16s %16u %16zu\n", client->name,
|
|
client->pid, size);
|
|
}
|
|
}
|
|
mutex_unlock(&debugfs_mutex);
|
|
|
|
seq_puts(s, "----------------------------------------------------\n");
|
|
seq_puts(s, "orphaned allocations (info is from last known client):\n");
|
|
mutex_lock(&dev->buffer_lock);
|
|
for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
|
|
struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
|
|
node);
|
|
if (buffer->heap->id != heap->id)
|
|
continue;
|
|
total_size += buffer->size;
|
|
if (!buffer->handle_count) {
|
|
seq_printf(s, "%16s %16u %16zu %d %d\n",
|
|
buffer->task_comm, buffer->pid,
|
|
buffer->size, buffer->kmap_cnt,
|
|
kref_read(&buffer->ref));
|
|
total_orphaned_size += buffer->size;
|
|
}
|
|
}
|
|
mutex_unlock(&dev->buffer_lock);
|
|
seq_puts(s, "----------------------------------------------------\n");
|
|
seq_printf(s, "%16s %16zu\n", "total orphaned",
|
|
total_orphaned_size);
|
|
seq_printf(s, "%16s %16zu\n", "total ", total_size);
|
|
if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
|
|
seq_printf(s, "%16s %16zu\n", "deferred free",
|
|
heap->free_list_size);
|
|
seq_puts(s, "----------------------------------------------------\n");
|
|
|
|
if (heap->debug_show)
|
|
heap->debug_show(heap, s, unused);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ion_debug_heap_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, ion_debug_heap_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations debug_heap_fops = {
|
|
.open = ion_debug_heap_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int debug_shrink_set(void *data, u64 val)
|
|
{
|
|
struct ion_heap *heap = data;
|
|
struct shrink_control sc;
|
|
int objs;
|
|
|
|
sc.gfp_mask = GFP_HIGHUSER;
|
|
sc.nr_to_scan = val;
|
|
|
|
if (!val) {
|
|
objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
|
|
sc.nr_to_scan = objs;
|
|
}
|
|
|
|
heap->shrinker.scan_objects(&heap->shrinker, &sc);
|
|
return 0;
|
|
}
|
|
|
|
static int debug_shrink_get(void *data, u64 *val)
|
|
{
|
|
struct ion_heap *heap = data;
|
|
struct shrink_control sc;
|
|
int objs;
|
|
|
|
sc.gfp_mask = GFP_HIGHUSER;
|
|
sc.nr_to_scan = 0;
|
|
|
|
objs = heap->shrinker.count_objects(&heap->shrinker, &sc);
|
|
*val = objs;
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get,
|
|
debug_shrink_set, "%llu\n");
|
|
|
|
void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
|
|
{
|
|
struct dentry *debug_file;
|
|
|
|
if (!heap->ops->allocate || !heap->ops->free)
|
|
pr_err("%s: can not add heap with invalid ops struct.\n",
|
|
__func__);
|
|
|
|
spin_lock_init(&heap->free_lock);
|
|
heap->free_list_size = 0;
|
|
|
|
if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
|
|
ion_heap_init_deferred_free(heap);
|
|
|
|
if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink)
|
|
ion_heap_init_shrinker(heap);
|
|
|
|
heap->dev = dev;
|
|
down_write(&dev->lock);
|
|
/*
|
|
* use negative heap->id to reverse the priority -- when traversing
|
|
* the list later attempt higher id numbers first
|
|
*/
|
|
plist_node_init(&heap->node, -heap->id);
|
|
plist_add(&heap->node, &dev->heaps);
|
|
debug_file = debugfs_create_file(heap->name, 0664,
|
|
dev->heaps_debug_root, heap,
|
|
&debug_heap_fops);
|
|
|
|
if (!debug_file) {
|
|
char buf[256], *path;
|
|
|
|
path = dentry_path(dev->heaps_debug_root, buf, 256);
|
|
pr_err("Failed to create heap debugfs at %s/%s\n",
|
|
path, heap->name);
|
|
}
|
|
|
|
if (heap->shrinker.count_objects && heap->shrinker.scan_objects) {
|
|
char debug_name[64];
|
|
|
|
snprintf(debug_name, 64, "%s_shrink", heap->name);
|
|
debug_file = debugfs_create_file(
|
|
debug_name, 0644, dev->heaps_debug_root, heap,
|
|
&debug_shrink_fops);
|
|
if (!debug_file) {
|
|
char buf[256], *path;
|
|
|
|
path = dentry_path(dev->heaps_debug_root, buf, 256);
|
|
pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
|
|
path, debug_name);
|
|
}
|
|
}
|
|
|
|
dev->heap_cnt++;
|
|
up_write(&dev->lock);
|
|
}
|
|
EXPORT_SYMBOL(ion_device_add_heap);
|
|
|
|
struct ion_device *ion_device_create(long (*custom_ioctl)
|
|
(struct ion_client *client,
|
|
unsigned int cmd,
|
|
unsigned long arg))
|
|
{
|
|
struct ion_device *idev;
|
|
int ret;
|
|
|
|
idev = kzalloc(sizeof(*idev), GFP_KERNEL);
|
|
if (!idev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
idev->dev.minor = MISC_DYNAMIC_MINOR;
|
|
idev->dev.name = "ion";
|
|
idev->dev.fops = &ion_fops;
|
|
idev->dev.parent = NULL;
|
|
ret = misc_register(&idev->dev);
|
|
if (ret) {
|
|
pr_err("ion: failed to register misc device.\n");
|
|
kfree(idev);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
idev->debug_root = debugfs_create_dir("ion", NULL);
|
|
if (!idev->debug_root) {
|
|
pr_err("ion: failed to create debugfs root directory.\n");
|
|
goto debugfs_done;
|
|
}
|
|
idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root);
|
|
if (!idev->heaps_debug_root) {
|
|
pr_err("ion: failed to create debugfs heaps directory.\n");
|
|
goto debugfs_done;
|
|
}
|
|
idev->clients_debug_root = debugfs_create_dir("clients",
|
|
idev->debug_root);
|
|
if (!idev->clients_debug_root)
|
|
pr_err("ion: failed to create debugfs clients directory.\n");
|
|
|
|
debugfs_done:
|
|
|
|
idev->custom_ioctl = custom_ioctl;
|
|
idev->buffers = RB_ROOT;
|
|
mutex_init(&idev->buffer_lock);
|
|
init_rwsem(&idev->lock);
|
|
plist_head_init(&idev->heaps);
|
|
idev->clients = RB_ROOT;
|
|
ion_root_client = &idev->clients;
|
|
mutex_init(&debugfs_mutex);
|
|
return idev;
|
|
}
|
|
EXPORT_SYMBOL(ion_device_create);
|
|
|
|
void ion_device_destroy(struct ion_device *dev)
|
|
{
|
|
misc_deregister(&dev->dev);
|
|
debugfs_remove_recursive(dev->debug_root);
|
|
/* XXX need to free the heaps and clients ? */
|
|
kfree(dev);
|
|
}
|
|
EXPORT_SYMBOL(ion_device_destroy);
|