- 根目录:
- drivers
- staging
- android
- ion
- ion.c
/*
* drivers/staging/android/ion/ion.c
*
* Copyright (C) 2011 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/device.h>
#include <linux/err.h>
#include <linux/file.h>
#include <linux/freezer.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/memblock.h>
#include <linux/miscdevice.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/mm_types.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/debugfs.h>
#include <linux/dma-buf.h>
#include <linux/idr.h>
#include "ion.h"
#include "ion_priv.h"
#include "compat_ion.h"
/**
* struct ion_device - the metadata of the ion device node
* @dev: the actual misc device
* @buffers: an rb tree of all the existing buffers
* @buffer_lock: lock protecting the tree of buffers
* @lock: rwsem protecting the tree of heaps and clients
* @heaps: list of all the heaps in the system
* @user_clients: list of all the clients created from userspace
*/
struct ion_device {
struct miscdevice dev;
struct rb_root buffers;
struct mutex buffer_lock;
struct rw_semaphore lock;
struct plist_head heaps;
long (*custom_ioctl)(struct ion_client *client, unsigned int cmd,
unsigned long arg);
struct rb_root clients;
struct dentry *debug_root;
struct dentry *heaps_debug_root;
struct dentry *clients_debug_root;
};
/**
* struct ion_client - a process/hw block local address space
* @node: node in the tree of all clients
* @dev: backpointer to ion device
* @handles: an rb tree of all the handles in this client
* @idr: an idr space for allocating handle ids
* @lock: lock protecting the tree of handles
* @name: used for debugging
* @display_name: used for debugging (unique version of @name)
* @display_serial: used for debugging (to make display_name unique)
* @task: used for debugging
*
* A client represents a list of buffers this client may access.
* The mutex stored here is used to protect both handles tree
* as well as the handles themselves, and should be held while modifying either.
*/
struct ion_client {
struct rb_node node;
struct ion_device *dev;
struct rb_root handles;
struct idr idr;
struct mutex lock;
const char *name;
char *display_name;
int display_serial;
struct task_struct *task;
pid_t pid;
struct dentry *debug_root;
};
/**
* ion_handle - a client local reference to a buffer
* @ref: reference count
* @client: back pointer to the client the buffer resides in
* @buffer: pointer to the buffer
* @node: node in the client's handle rbtree
* @kmap_cnt: count of times this client has mapped to kernel
* @id: client-unique id allocated by client->idr
*
* Modifications to node, map_cnt or mapping should be protected by the
* lock in the client. Other fields are never changed after initialization.
*/
struct ion_handle {
struct kref ref;
struct ion_client *client;
struct ion_buffer *buffer;
struct rb_node node;
unsigned int kmap_cnt;
int id;
};
bool ion_buffer_fault_user_mappings(struct ion_buffer *buffer)
{
return (buffer->flags & ION_FLAG_CACHED) &&
!(buffer->flags & ION_FLAG_CACHED_NEEDS_SYNC);
}
bool ion_buffer_cached(struct ion_buffer *buffer)
{
return !!(buffer->flags & ION_FLAG_CACHED);
}
static inline struct page *ion_buffer_page(struct page *page)
{
return (struct page *)((unsigned long)page & ~(1UL));
}
static inline bool ion_buffer_page_is_dirty(struct page *page)
{
return !!((unsigned long)page & 1UL);
}
static inline void ion_buffer_page_dirty(struct page **page)
{
*page = (struct page *)((unsigned long)(*page) | 1UL);
}
static inline void ion_buffer_page_clean(struct page **page)
{
*page = (struct page *)((unsigned long)(*page) & ~(1UL));
}
/* this function should only be called while dev->lock is held */
static void ion_buffer_add(struct ion_device *dev,
struct ion_buffer *buffer)
{
struct rb_node **p = &dev->buffers.rb_node;
struct rb_node *parent = NULL;
struct ion_buffer *entry;
while (*p) {
parent = *p;
entry = rb_entry(parent, struct ion_buffer, node);
if (buffer < entry) {
p = &(*p)->rb_left;
} else if (buffer > entry) {
p = &(*p)->rb_right;
} else {
pr_err("%s: buffer already found.", __func__);
BUG();
}
}
rb_link_node(&buffer->node, parent, p);
rb_insert_color(&buffer->node, &dev->buffers);
}
/* this function should only be called while dev->lock is held */
static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
struct ion_device *dev,
unsigned long len,
unsigned long align,
unsigned long flags)
{
struct ion_buffer *buffer;
struct sg_table *table;
struct scatterlist *sg;
int i, ret;
buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
if (!buffer)
return ERR_PTR(-ENOMEM);
buffer->heap = heap;
buffer->flags = flags;
kref_init(&buffer->ref);
ret = heap->ops->allocate(heap, buffer, len, align, flags);
if (ret) {
if (!(heap->flags & ION_HEAP_FLAG_DEFER_FREE))
goto err2;
ion_heap_freelist_drain(heap, 0);
ret = heap->ops->allocate(heap, buffer, len, align,
flags);
if (ret)
goto err2;
}
buffer->dev = dev;
buffer->size = len;
table = heap->ops->map_dma(heap, buffer);
if (WARN_ONCE(table == NULL,
"heap->ops->map_dma should return ERR_PTR on error"))
table = ERR_PTR(-EINVAL);
if (IS_ERR(table)) {
heap->ops->free(buffer);
kfree(buffer);
return ERR_CAST(table);
}
buffer->sg_table = table;
if (ion_buffer_fault_user_mappings(buffer)) {
int num_pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
struct scatterlist *sg;
int i, j, k = 0;
buffer->pages = vmalloc(sizeof(struct page *) * num_pages);
if (!buffer->pages) {
ret = -ENOMEM;
goto err1;
}
for_each_sg(table->sgl, sg, table->nents, i) {
struct page *page = sg_page(sg);
for (j = 0; j < sg->length / PAGE_SIZE; j++)
buffer->pages[k++] = page++;
}
if (ret)
goto err;
}
buffer->dev = dev;
buffer->size = len;
INIT_LIST_HEAD(&buffer->vmas);
mutex_init(&buffer->lock);
/* this will set up dma addresses for the sglist -- it is not
technically correct as per the dma api -- a specific
device isn't really taking ownership here. However, in practice on
our systems the only dma_address space is physical addresses.
Additionally, we can't afford the overhead of invalidating every
allocation via dma_map_sg. The implicit contract here is that
memory coming from the heaps is ready for dma, ie if it has a
cached mapping that mapping has been invalidated */
for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents, i)
sg_dma_address(sg) = sg_phys(sg);
mutex_lock(&dev->buffer_lock);
ion_buffer_add(dev, buffer);
mutex_unlock(&dev->buffer_lock);
return buffer;
err:
heap->ops->unmap_dma(heap, buffer);
heap->ops->free(buffer);
err1:
if (buffer->pages)
vfree(buffer->pages);
err2:
kfree(buffer);
return ERR_PTR(ret);
}
void ion_buffer_destroy(struct ion_buffer *buffer)
{
if (WARN_ON(buffer->kmap_cnt > 0))
buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
buffer->heap->ops->unmap_dma(buffer->heap, buffer);
buffer->heap->ops->free(buffer);
if (buffer->pages)
vfree(buffer->pages);
kfree(buffer);
}
static void _ion_buffer_destroy(struct kref *kref)
{
struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
struct ion_heap *heap = buffer->heap;
struct ion_device *dev = buffer->dev;
mutex_lock(&dev->buffer_lock);
rb_erase(&buffer->node, &dev->buffers);
mutex_unlock(&dev->buffer_lock);
if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
ion_heap_freelist_add(heap, buffer);
else
ion_buffer_destroy(buffer);
}
static void ion_buffer_get(struct ion_buffer *buffer)
{
kref_get(&buffer->ref);
}
static int ion_buffer_put(struct ion_buffer *buffer)
{
return kref_put(&buffer->ref, _ion_buffer_destroy);
}
static void ion_buffer_add_to_handle(struct ion_buffer *buffer)
{
mutex_lock(&buffer->lock);
buffer->handle_count++;
mutex_unlock(&buffer->lock);
}
static void ion_buffer_remove_from_handle(struct ion_buffer *buffer)
{
/*
* when a buffer is removed from a handle, if it is not in
* any other handles, copy the taskcomm and the pid of the
* process it's being removed from into the buffer. At this
* point there will be no way to track what processes this buffer is
* being used by, it only exists as a dma_buf file descriptor.
* The taskcomm and pid can provide a debug hint as to where this fd
* is in the system
*/
mutex_lock(&buffer->lock);
buffer->handle_count--;
BUG_ON(buffer->handle_count < 0);
if (!buffer->handle_count) {
struct task_struct *task;
task = current->group_leader;
get_task_comm(buffer->task_comm, task);
buffer->pid = task_pid_nr(task);
}
mutex_unlock(&buffer->lock);
}
static struct ion_handle *ion_handle_create(struct ion_client *client,
struct ion_buffer *buffer)
{
struct ion_handle *handle;
handle = kzalloc(sizeof(struct ion_handle), GFP_KERNEL);
if (!handle)
return ERR_PTR(-ENOMEM);
kref_init(&handle->ref);
RB_CLEAR_NODE(&handle->node);
handle->client = client;
ion_buffer_get(buffer);
ion_buffer_add_to_handle(buffer);
handle->buffer = buffer;
return handle;
}
static void ion_handle_kmap_put(struct ion_handle *);
static void ion_handle_destroy(struct kref *kref)
{
struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
struct ion_client *client = handle->client;
struct ion_buffer *buffer = handle->buffer;
mutex_lock(&buffer->lock);
while (handle->kmap_cnt)
ion_handle_kmap_put(handle);
mutex_unlock(&buffer->lock);
idr_remove(&client->idr, handle->id);
if (!RB_EMPTY_NODE(&handle->node))
rb_erase(&handle->node, &client->handles);
ion_buffer_remove_from_handle(buffer);
ion_buffer_put(buffer);
kfree(handle);
}
struct ion_buffer *ion_handle_buffer(struct ion_handle *handle)
{
return handle->buffer;
}
static void ion_handle_get(struct ion_handle *handle)
{
kref_get(&handle->ref);
}
static int ion_handle_put(struct ion_handle *handle)
{
struct ion_client *client = handle->client;
int ret;
mutex_lock(&client->lock);
ret = kref_put(&handle->ref, ion_handle_destroy);
mutex_unlock(&client->lock);
return ret;
}
static struct ion_handle *ion_handle_lookup(struct ion_client *client,
struct ion_buffer *buffer)
{
struct rb_node *n = client->handles.rb_node;
while (n) {
struct ion_handle *entry = rb_entry(n, struct ion_handle, node);
if (buffer < entry->buffer)
n = n->rb_left;
else if (buffer > entry->buffer)
n = n->rb_right;
else
return entry;
}
return ERR_PTR(-EINVAL);
}
static struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
int id)
{
struct ion_handle *handle;
mutex_lock(&client->lock);
handle = idr_find(&client->idr, id);
if (handle)
ion_handle_get(handle);
mutex_unlock(&client->lock);
return handle ? handle : ERR_PTR(-EINVAL);
}
static bool ion_handle_validate(struct ion_client *client,
struct ion_handle *handle)
{
WARN_ON(!mutex_is_locked(&client->lock));
return idr_find(&client->idr, handle->id) == handle;
}
static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
{
int id;
struct rb_node **p = &client->handles.rb_node;
struct rb_node *parent = NULL;
struct ion_handle *entry;
id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
if (id < 0)
return id;
handle->id = id;
while (*p) {
parent = *p;
entry = rb_entry(parent, struct ion_handle, node);
if (handle->buffer < entry->buffer)
p = &(*p)->rb_left;
else if (handle->buffer > entry->buffer)
p = &(*p)->rb_right;
else
WARN(1, "%s: buffer already found.", __func__);
}
rb_link_node(&handle->node, parent, p);
rb_insert_color(&handle->node, &client->handles);
return 0;
}
struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
size_t align, unsigned int heap_id_mask,
unsigned int flags)
{
struct ion_handle *handle;
struct ion_device *dev = client->dev;
struct ion_buffer *buffer = NULL;
struct ion_heap *heap;
int ret;
pr_debug("%s: len %zu align %zu heap_id_mask %u flags %x\n", __func__,
len, align, heap_id_mask, flags);
/*
* traverse the list of heaps available in this system in priority
* order. If the heap type is supported by the client, and matches the
* request of the caller allocate from it. Repeat until allocate has
* succeeded or all heaps have been tried
*/
len = PAGE_ALIGN(len);
if (!len)
return ERR_PTR(-EINVAL);
down_read(&dev->lock);
plist_for_each_entry(heap, &dev->heaps, node) {
/* if the caller didn't specify this heap id */
if (!((1 << heap->id) & heap_id_mask))
continue;
buffer = ion_buffer_create(heap, dev, len, align, flags);
if (!IS_ERR(buffer))
break;
}
up_read(&dev->lock);
if (buffer == NULL)
return ERR_PTR(-ENODEV);
if (IS_ERR(buffer))
return ERR_CAST(buffer);
handle = ion_handle_create(client, buffer);
/*
* ion_buffer_create will create a buffer with a ref_cnt of 1,
* and ion_handle_create will take a second reference, drop one here
*/
ion_buffer_put(buffer);
if (IS_ERR(handle))
return handle;
mutex_lock(&client->lock);
ret = ion_handle_add(client, handle);
mutex_unlock(&client->lock);
if (ret) {
ion_handle_put(handle);
handle = ERR_PTR(ret);
}
return handle;
}
EXPORT_SYMBOL(ion_alloc);
void ion_free(struct ion_client *client, struct ion_handle *handle)
{
bool valid_handle;
BUG_ON(client != handle->client);
mutex_lock(&client->lock);
valid_handle = ion_handle_validate(client, handle);
if (!valid_handle) {
WARN(1, "%s: invalid handle passed to free.\n", __func__);
mutex_unlock(&client->lock);
return;
}
mutex_unlock(&client->lock);
ion_handle_put(handle);
}
EXPORT_SYMBOL(ion_free);
int ion_phys(struct ion_client *client, struct ion_handle *handle,
ion_phys_addr_t *addr, size_t *len)
{
struct ion_buffer *buffer;
int ret;
mutex_lock(&client->lock);
if (!ion_handle_validate(client, handle)) {
mutex_unlock(&client->lock);
return -EINVAL;
}
buffer = handle->buffer;
if (!buffer->heap->ops->phys) {
pr_err("%s: ion_phys is not implemented by this heap.\n",
__func__);
mutex_unlock(&client->lock);
return -ENODEV;
}
mutex_unlock(&client->lock);
ret = buffer->heap->ops->phys(buffer->heap, buffer, addr, len);
return ret;
}
EXPORT_SYMBOL(ion_phys);
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 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(&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);
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(struct ion_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__);
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);
}
EXPORT_SYMBOL(ion_client_destroy);
struct sg_table *ion_sg_table(struct ion_client *client,
struct ion_handle *handle)
{
struct ion_buffer *buffer;
struct sg_table *table;
mutex_lock(&client->lock);
if (!ion_handle_validate(client, handle)) {
pr_err("%s: invalid handle passed to map_dma.\n",
__func__);
mutex_unlock(&client->lock);
return ERR_PTR(-EINVAL);
}
buffer = handle->buffer;
table = buffer->sg_table;
mutex_unlock(&client->lock);
return table;
}
EXPORT_SYMBOL(ion_sg_table);
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,
NULL);
}
mutex_unlock(&buffer->lock);
}
static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct ion_buffer *buffer = 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(vma, (unsigned long)vmf->virtual_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(struct ion_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 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, size_t start,
size_t len,
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 void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start,
size_t len,
enum dma_data_direction direction)
{
struct ion_buffer *buffer = dmabuf->priv;
mutex_lock(&buffer->lock);
ion_buffer_kmap_put(buffer);
mutex_unlock(&buffer->lock);
}
static 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)
{
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);
dmabuf = dma_buf_export(buffer, &dma_buf_ops, buffer->size, O_RDWR,
NULL);
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, int fd)
{
struct dma_buf *dmabuf;
struct ion_buffer *buffer;
struct ion_handle *handle;
int ret;
dmabuf = dma_buf_get(fd);
if (IS_ERR(dmabuf))
return ERR_CAST(dmabuf);
/* if this memory came from ion */
if (dmabuf->ops != &dma_buf_ops) {
pr_err("%s: can not import dmabuf from another exporter\n",
__func__);
dma_buf_put(dmabuf);
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:
dma_buf_put(dmabuf);
return handle;
}
EXPORT_SYMBOL(ion_import_dma_buf);
static 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;
}
/* fix up the cases where the ioctl direction bits are incorrect */
static unsigned int ion_ioctl_dir(unsigned int cmd)
{
switch (cmd) {
case ION_IOC_SYNC:
case ION_IOC_FREE:
case ION_IOC_CUSTOM:
return _IOC_WRITE;
default:
return _IOC_DIR(cmd);
}
}
static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct ion_client *client = filp->private_data;
struct ion_device *dev = client->dev;
struct ion_handle *cleanup_handle = NULL;
int ret = 0;
unsigned int dir;
union {
struct ion_fd_data fd;
struct ion_allocation_data allocation;
struct ion_handle_data handle;
struct ion_custom_data custom;
} data;
dir = ion_ioctl_dir(cmd);
if (_IOC_SIZE(cmd) > sizeof(data))
return -EINVAL;
if (dir & _IOC_WRITE)
if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
return -EFAULT;
switch (cmd) {
case ION_IOC_ALLOC:
{
struct ion_handle *handle;
handle = ion_alloc(client, data.allocation.len,
data.allocation.align,
data.allocation.heap_id_mask,
data.allocation.flags);
if (IS_ERR(handle))
return PTR_ERR(handle);
data.allocation.handle = handle->id;
cleanup_handle = handle;
break;
}
case ION_IOC_FREE:
{
struct ion_handle *handle;
handle = ion_handle_get_by_id(client, data.handle.handle);
if (IS_ERR(handle))
return PTR_ERR(handle);
ion_free(client, handle);
ion_handle_put(handle);
break;
}
case ION_IOC_SHARE:
case ION_IOC_MAP:
{
struct ion_handle *handle;
handle = ion_handle_get_by_id(client, data.handle.handle);
if (IS_ERR(handle))
return PTR_ERR(handle);
data.fd.fd = ion_share_dma_buf_fd(client, handle);
ion_handle_put(handle);
if (data.fd.fd < 0)
ret = data.fd.fd;
break;
}
case ION_IOC_IMPORT:
{
struct ion_handle *handle;
handle = ion_import_dma_buf(client, data.fd.fd);
if (IS_ERR(handle))
ret = PTR_ERR(handle);
else
data.handle.handle = handle->id;
break;
}
case ION_IOC_SYNC:
{
ret = ion_sync_for_device(client, data.fd.fd);
break;
}
case ION_IOC_CUSTOM:
{
if (!dev->custom_ioctl)
return -ENOTTY;
ret = dev->custom_ioctl(client, data.custom.cmd,
data.custom.arg);
break;
}
default:
return -ENOTTY;
}
if (dir & _IOC_READ) {
if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
if (cleanup_handle)
ion_free(client, cleanup_handle);
return -EFAULT;
}
}
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, "%16.s %16.s %16.s\n", "client", "pid", "size");
seq_puts(s, "----------------------------------------------------\n");
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, "%16.s %16u %16zu\n", task_comm,
client->pid, size);
} else {
seq_printf(s, "%16.s %16u %16zu\n", client->name,
client->pid, size);
}
}
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, "%16.s %16u %16zu %d %d\n",
buffer->task_comm, buffer->pid,
buffer->size, buffer->kmap_cnt,
atomic_read(&buffer->ref.refcount));
total_orphaned_size += buffer->size;
}
}
mutex_unlock(&dev->buffer_lock);
seq_puts(s, "----------------------------------------------------\n");
seq_printf(s, "%16.s %16zu\n", "total orphaned",
total_orphaned_size);
seq_printf(s, "%16.s %16zu\n", "total ", total_size);
if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
seq_printf(s, "%16.s %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 = -1;
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 = -1;
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 || !heap->ops->map_dma ||
!heap->ops->unmap_dma)
pr_err("%s: can not add heap with invalid ops struct.\n",
__func__);
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);
}
}
up_write(&dev->lock);
}
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(struct ion_device), 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");
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;
return idev;
}
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);
}
void __init ion_reserve(struct ion_platform_data *data)
{
int i;
for (i = 0; i < data->nr; i++) {
if (data->heaps[i].size == 0)
continue;
if (data->heaps[i].base == 0) {
phys_addr_t paddr;
paddr = memblock_alloc_base(data->heaps[i].size,
data->heaps[i].align,
MEMBLOCK_ALLOC_ANYWHERE);
if (!paddr) {
pr_err("%s: error allocating memblock for heap %d\n",
__func__, i);
continue;
}
data->heaps[i].base = paddr;
} else {
int ret = memblock_reserve(data->heaps[i].base,
data->heaps[i].size);
if (ret)
pr_err("memblock reserve of %zx@%lx failed\n",
data->heaps[i].size,
data->heaps[i].base);
}
pr_info("%s: %s reserved base %lx size %zu\n", __func__,
data->heaps[i].name,
data->heaps[i].base,
data->heaps[i].size);
}
}