- 根目录:
- drivers
- gpu
- ion
- ion.c
/*
* drivers/gpu/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/file.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/ion.h>
#include <linux/list.h>
#include <linux/miscdevice.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/mm_types.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include "ion_priv.h"
#define DEBUG
/**
* struct ion_device - the metadata of the ion device node
* @dev: the actual misc device
* @buffers: an rb tree of all the existing buffers
* @lock: lock protecting the buffers & heaps trees
* @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 lock;
struct rb_root heaps;
long (*custom_ioctl) (struct ion_client *client, unsigned int cmd,
unsigned long arg);
struct rb_root user_clients;
struct rb_root kernel_clients;
struct dentry *debug_root;
};
/**
* struct ion_client - a process/hw block local address space
* @ref: for reference counting the client
* @node: node in the tree of all clients
* @dev: backpointer to ion device
* @handles: an rb tree of all the handles in this client
* @lock: lock protecting the tree of handles
* @heap_mask: mask of all supported heaps
* @name: used for debugging
* @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 kref ref;
struct rb_node node;
struct ion_device *dev;
struct rb_root handles;
struct mutex lock;
unsigned int heap_mask;
const char *name;
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
* @dmap_cnt: count of times this client has mapped for dma
* @usermap_cnt: count of times this client has mapped for userspace
*
* 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;
unsigned int dmap_cnt;
unsigned int usermap_cnt;
};
/* 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;
int ret;
buffer = kzalloc(sizeof(struct ion_buffer), GFP_KERNEL);
if (!buffer)
return ERR_PTR(-ENOMEM);
buffer->heap = heap;
kref_init(&buffer->ref);
ret = heap->ops->allocate(heap, buffer, len, align, flags);
if (ret) {
kfree(buffer);
return ERR_PTR(ret);
}
buffer->dev = dev;
buffer->size = len;
mutex_init(&buffer->lock);
ion_buffer_add(dev, buffer);
return buffer;
}
static void ion_buffer_destroy(struct kref *kref)
{
struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
struct ion_device *dev = buffer->dev;
buffer->heap->ops->free(buffer);
mutex_lock(&dev->lock);
rb_erase(&buffer->node, &dev->buffers);
mutex_unlock(&dev->lock);
kfree(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 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_init_node(&handle->node);
handle->client = client;
ion_buffer_get(buffer);
handle->buffer = buffer;
return handle;
}
static void ion_handle_destroy(struct kref *kref)
{
struct ion_handle *handle = container_of(kref, struct ion_handle, ref);
/* XXX Can a handle be destroyed while it's map count is non-zero?:
if (handle->map_cnt) unmap
*/
ion_buffer_put(handle->buffer);
mutex_lock(&handle->client->lock);
if (!RB_EMPTY_NODE(&handle->node))
rb_erase(&handle->node, &handle->client->handles);
mutex_unlock(&handle->client->lock);
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)
{
return kref_put(&handle->ref, ion_handle_destroy);
}
static struct ion_handle *ion_handle_lookup(struct ion_client *client,
struct ion_buffer *buffer)
{
struct rb_node *n;
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 == buffer)
return handle;
}
return NULL;
}
static bool ion_handle_validate(struct ion_client *client, struct ion_handle *handle)
{
struct rb_node *n = client->handles.rb_node;
while (n) {
struct ion_handle *handle_node = rb_entry(n, struct ion_handle,
node);
if (handle < handle_node)
n = n->rb_left;
else if (handle > handle_node)
n = n->rb_right;
else
return true;
}
return false;
}
static void ion_handle_add(struct ion_client *client, struct ion_handle *handle)
{
struct rb_node **p = &client->handles.rb_node;
struct rb_node *parent = NULL;
struct ion_handle *entry;
while (*p) {
parent = *p;
entry = rb_entry(parent, struct ion_handle, node);
if (handle < entry)
p = &(*p)->rb_left;
else if (handle > entry)
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);
}
struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
size_t align, unsigned int flags)
{
struct rb_node *n;
struct ion_handle *handle;
struct ion_device *dev = client->dev;
struct ion_buffer *buffer = NULL;
/*
* 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
*/
mutex_lock(&dev->lock);
for (n = rb_first(&dev->heaps); n != NULL; n = rb_next(n)) {
struct ion_heap *heap = rb_entry(n, struct ion_heap, node);
/* if the client doesn't support this heap type */
if (!((1 << heap->type) & client->heap_mask))
continue;
/* if the caller didn't specify this heap type */
if (!((1 << heap->id) & flags))
continue;
buffer = ion_buffer_create(heap, dev, len, align, flags);
if (!IS_ERR_OR_NULL(buffer))
break;
}
mutex_unlock(&dev->lock);
if (IS_ERR_OR_NULL(buffer))
return ERR_PTR(PTR_ERR(buffer));
handle = ion_handle_create(client, buffer);
if (IS_ERR_OR_NULL(handle))
goto end;
/*
* 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);
mutex_lock(&client->lock);
ion_handle_add(client, handle);
mutex_unlock(&client->lock);
return handle;
end:
ion_buffer_put(buffer);
return handle;
}
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);
mutex_unlock(&client->lock);
if (!valid_handle) {
WARN("%s: invalid handle passed to free.\n", __func__);
return;
}
ion_handle_put(handle);
}
static void ion_client_get(struct ion_client *client);
static int ion_client_put(struct ion_client *client);
static bool _ion_map(int *buffer_cnt, int *handle_cnt)
{
bool map;
BUG_ON(*handle_cnt != 0 && *buffer_cnt == 0);
if (*buffer_cnt)
map = false;
else
map = true;
if (*handle_cnt == 0)
(*buffer_cnt)++;
(*handle_cnt)++;
return map;
}
static bool _ion_unmap(int *buffer_cnt, int *handle_cnt)
{
BUG_ON(*handle_cnt == 0);
(*handle_cnt)--;
if (*handle_cnt != 0)
return false;
BUG_ON(*buffer_cnt == 0);
(*buffer_cnt)--;
if (*buffer_cnt == 0)
return true;
return false;
}
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;
}
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;
mutex_lock(&buffer->lock);
if (!handle->buffer->heap->ops->map_kernel) {
pr_err("%s: map_kernel is not implemented by this heap.\n",
__func__);
mutex_unlock(&buffer->lock);
mutex_unlock(&client->lock);
return ERR_PTR(-ENODEV);
}
if (_ion_map(&buffer->kmap_cnt, &handle->kmap_cnt)) {
vaddr = buffer->heap->ops->map_kernel(buffer->heap, buffer);
if (IS_ERR_OR_NULL(vaddr))
_ion_unmap(&buffer->kmap_cnt, &handle->kmap_cnt);
buffer->vaddr = vaddr;
} else {
vaddr = buffer->vaddr;
}
mutex_unlock(&buffer->lock);
mutex_unlock(&client->lock);
return vaddr;
}
struct scatterlist *ion_map_dma(struct ion_client *client,
struct ion_handle *handle)
{
struct ion_buffer *buffer;
struct scatterlist *sglist;
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;
mutex_lock(&buffer->lock);
if (!handle->buffer->heap->ops->map_dma) {
pr_err("%s: map_kernel is not implemented by this heap.\n",
__func__);
mutex_unlock(&buffer->lock);
mutex_unlock(&client->lock);
return ERR_PTR(-ENODEV);
}
if (_ion_map(&buffer->dmap_cnt, &handle->dmap_cnt)) {
sglist = buffer->heap->ops->map_dma(buffer->heap, buffer);
if (IS_ERR_OR_NULL(sglist))
_ion_unmap(&buffer->dmap_cnt, &handle->dmap_cnt);
buffer->sglist = sglist;
} else {
sglist = buffer->sglist;
}
mutex_unlock(&buffer->lock);
mutex_unlock(&client->lock);
return sglist;
}
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);
if (_ion_unmap(&buffer->kmap_cnt, &handle->kmap_cnt)) {
buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
buffer->vaddr = NULL;
}
mutex_unlock(&buffer->lock);
mutex_unlock(&client->lock);
}
void ion_unmap_dma(struct ion_client *client, struct ion_handle *handle)
{
struct ion_buffer *buffer;
mutex_lock(&client->lock);
buffer = handle->buffer;
mutex_lock(&buffer->lock);
if (_ion_unmap(&buffer->dmap_cnt, &handle->dmap_cnt)) {
buffer->heap->ops->unmap_dma(buffer->heap, buffer);
buffer->sglist = NULL;
}
mutex_unlock(&buffer->lock);
mutex_unlock(&client->lock);
}
struct ion_buffer *ion_share(struct ion_client *client,
struct ion_handle *handle)
{
bool valid_handle;
mutex_lock(&client->lock);
valid_handle = ion_handle_validate(client, handle);
mutex_unlock(&client->lock);
if (!valid_handle) {
WARN("%s: invalid handle passed to share.\n", __func__);
return ERR_PTR(-EINVAL);
}
/* do not take an extra reference here, the burden is on the caller
* to make sure the buffer doesn't go away while it's passing it
* to another client -- ion_free should not be called on this handle
* until the buffer has been imported into the other client
*/
return handle->buffer;
}
struct ion_handle *ion_import(struct ion_client *client,
struct ion_buffer *buffer)
{
struct ion_handle *handle = NULL;
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_OR_NULL(handle)) {
ion_handle_get(handle);
goto end;
}
handle = ion_handle_create(client, buffer);
if (IS_ERR_OR_NULL(handle))
goto end;
ion_handle_add(client, handle);
end:
mutex_unlock(&client->lock);
return handle;
}
static const struct file_operations ion_share_fops;
struct ion_handle *ion_import_fd(struct ion_client *client, int fd)
{
struct file *file = fget(fd);
struct ion_handle *handle;
if (!file) {
pr_err("%s: imported fd not found in file table.\n", __func__);
return ERR_PTR(-EINVAL);
}
if (file->f_op != &ion_share_fops) {
pr_err("%s: imported file is not a shared ion file.\n",
__func__);
handle = ERR_PTR(-EINVAL);
goto end;
}
handle = ion_import(client, file->private_data);
end:
fput(file);
return handle;
}
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_HEAPS] = {0};
const char *names[ION_NUM_HEAPS] = {0};
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);
enum ion_heap_type type = handle->buffer->heap->type;
if (!names[type])
names[type] = handle->buffer->heap->name;
sizes[type] += 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_HEAPS; i++) {
if (!names[i])
continue;
seq_printf(s, "%16.16s: %16u %d\n", names[i], sizes[i],
atomic_read(&client->ref.refcount));
}
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 struct ion_client *ion_client_lookup(struct ion_device *dev,
struct task_struct *task)
{
struct rb_node *n = dev->user_clients.rb_node;
struct ion_client *client;
mutex_lock(&dev->lock);
while (n) {
client = rb_entry(n, struct ion_client, node);
if (task == client->task) {
ion_client_get(client);
mutex_unlock(&dev->lock);
return client;
} else if (task < client->task) {
n = n->rb_left;
} else if (task > client->task) {
n = n->rb_right;
}
}
mutex_unlock(&dev->lock);
return NULL;
}
struct ion_client *ion_client_create(struct ion_device *dev,
unsigned int heap_mask,
const char *name)
{
struct ion_client *client;
struct task_struct *task;
struct rb_node **p;
struct rb_node *parent = NULL;
struct ion_client *entry;
char debug_name[64];
pid_t pid;
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);
/* if this isn't a kernel thread, see if a client already
exists */
if (task) {
client = ion_client_lookup(dev, task);
if (!IS_ERR_OR_NULL(client)) {
put_task_struct(current->group_leader);
return client;
}
}
client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
if (!client) {
put_task_struct(current->group_leader);
return ERR_PTR(-ENOMEM);
}
client->dev = dev;
client->handles = RB_ROOT;
mutex_init(&client->lock);
client->name = name;
client->heap_mask = heap_mask;
client->task = task;
client->pid = pid;
kref_init(&client->ref);
mutex_lock(&dev->lock);
if (task) {
p = &dev->user_clients.rb_node;
while (*p) {
parent = *p;
entry = rb_entry(parent, struct ion_client, node);
if (task < entry->task)
p = &(*p)->rb_left;
else if (task > entry->task)
p = &(*p)->rb_right;
}
rb_link_node(&client->node, parent, p);
rb_insert_color(&client->node, &dev->user_clients);
} else {
p = &dev->kernel_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->kernel_clients);
}
snprintf(debug_name, 64, "%u", client->pid);
client->debug_root = debugfs_create_file(debug_name, 0664,
dev->debug_root, client,
&debug_client_fops);
mutex_unlock(&dev->lock);
return client;
}
static void _ion_client_destroy(struct kref *kref)
{
struct ion_client *client = container_of(kref, struct ion_client, ref);
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);
}
mutex_lock(&dev->lock);
if (client->task) {
rb_erase(&client->node, &dev->user_clients);
put_task_struct(client->task);
} else {
rb_erase(&client->node, &dev->kernel_clients);
}
debugfs_remove_recursive(client->debug_root);
mutex_unlock(&dev->lock);
kfree(client);
}
static void ion_client_get(struct ion_client *client)
{
kref_get(&client->ref);
}
static int ion_client_put(struct ion_client *client)
{
return kref_put(&client->ref, _ion_client_destroy);
}
void ion_client_destroy(struct ion_client *client)
{
ion_client_put(client);
}
static int ion_share_release(struct inode *inode, struct file* file)
{
struct ion_buffer *buffer = file->private_data;
pr_debug("%s: %d\n", __func__, __LINE__);
/* drop the reference to the buffer -- this prevents the
buffer from going away because the client holding it exited
while it was being passed */
ion_buffer_put(buffer);
return 0;
}
static void ion_vma_open(struct vm_area_struct *vma)
{
struct ion_buffer *buffer = vma->vm_file->private_data;
struct ion_handle *handle = vma->vm_private_data;
struct ion_client *client;
pr_debug("%s: %d\n", __func__, __LINE__);
/* check that the client still exists and take a reference so
it can't go away until this vma is closed */
client = ion_client_lookup(buffer->dev, current->group_leader);
if (IS_ERR_OR_NULL(client)) {
vma->vm_private_data = NULL;
return;
}
pr_debug("%s: %d client_cnt %d handle_cnt %d alloc_cnt %d\n",
__func__, __LINE__,
atomic_read(&client->ref.refcount),
atomic_read(&handle->ref.refcount),
atomic_read(&buffer->ref.refcount));
}
static void ion_vma_close(struct vm_area_struct *vma)
{
struct ion_handle *handle = vma->vm_private_data;
struct ion_buffer *buffer = vma->vm_file->private_data;
struct ion_client *client;
pr_debug("%s: %d\n", __func__, __LINE__);
/* this indicates the client is gone, nothing to do here */
if (!handle)
return;
client = handle->client;
pr_debug("%s: %d client_cnt %d handle_cnt %d alloc_cnt %d\n",
__func__, __LINE__,
atomic_read(&client->ref.refcount),
atomic_read(&handle->ref.refcount),
atomic_read(&buffer->ref.refcount));
ion_handle_put(handle);
ion_client_put(client);
pr_debug("%s: %d client_cnt %d handle_cnt %d alloc_cnt %d\n",
__func__, __LINE__,
atomic_read(&client->ref.refcount),
atomic_read(&handle->ref.refcount),
atomic_read(&buffer->ref.refcount));
}
static struct vm_operations_struct ion_vm_ops = {
.open = ion_vma_open,
.close = ion_vma_close,
};
static int ion_share_mmap(struct file *file, struct vm_area_struct *vma)
{
struct ion_buffer *buffer = file->private_data;
unsigned long size = vma->vm_end - vma->vm_start;
struct ion_client *client;
struct ion_handle *handle;
int ret;
pr_debug("%s: %d\n", __func__, __LINE__);
/* make sure the client still exists, it's possible for the client to
have gone away but the map/share fd still to be around, take
a reference to it so it can't go away while this mapping exists */
client = ion_client_lookup(buffer->dev, current->group_leader);
if (IS_ERR_OR_NULL(client)) {
pr_err("%s: trying to mmap an ion handle in a process with no "
"ion client\n", __func__);
return -EINVAL;
}
if ((size > buffer->size) || (size + (vma->vm_pgoff << PAGE_SHIFT) >
buffer->size)) {
pr_err("%s: trying to map larger area than handle has available"
"\n", __func__);
ret = -EINVAL;
goto err;
}
/* find the handle and take a reference to it */
handle = ion_import(client, buffer);
if (IS_ERR_OR_NULL(handle)) {
ret = -EINVAL;
goto err;
}
if (!handle->buffer->heap->ops->map_user) {
pr_err("%s: this heap does not define a method for mapping "
"to userspace\n", __func__);
ret = -EINVAL;
goto err1;
}
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__);
goto err1;
}
vma->vm_ops = &ion_vm_ops;
/* move the handle into the vm_private_data so we can access it from
vma_open/close */
vma->vm_private_data = handle;
pr_debug("%s: %d client_cnt %d handle_cnt %d alloc_cnt %d\n",
__func__, __LINE__,
atomic_read(&client->ref.refcount),
atomic_read(&handle->ref.refcount),
atomic_read(&buffer->ref.refcount));
return 0;
err1:
/* drop the reference to the handle */
ion_handle_put(handle);
err:
/* drop the reference to the client */
ion_client_put(client);
return ret;
}
static const struct file_operations ion_share_fops = {
.owner = THIS_MODULE,
.release = ion_share_release,
.mmap = ion_share_mmap,
};
static int ion_ioctl_share(struct file *parent, struct ion_client *client,
struct ion_handle *handle)
{
int fd = get_unused_fd();
struct file *file;
if (fd < 0)
return -ENFILE;
file = anon_inode_getfile("ion_share_fd", &ion_share_fops,
handle->buffer, O_RDWR);
if (IS_ERR_OR_NULL(file))
goto err;
ion_buffer_get(handle->buffer);
fd_install(fd, file);
return fd;
err:
put_unused_fd(fd);
return -ENFILE;
}
static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
struct ion_client *client = filp->private_data;
switch (cmd) {
case ION_IOC_ALLOC:
{
struct ion_allocation_data data;
if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
return -EFAULT;
data.handle = ion_alloc(client, data.len, data.align,
data.flags);
if (copy_to_user((void __user *)arg, &data, sizeof(data)))
return -EFAULT;
break;
}
case ION_IOC_FREE:
{
struct ion_handle_data data;
bool valid;
if (copy_from_user(&data, (void __user *)arg,
sizeof(struct ion_handle_data)))
return -EFAULT;
mutex_lock(&client->lock);
valid = ion_handle_validate(client, data.handle);
mutex_unlock(&client->lock);
if (!valid)
return -EINVAL;
ion_free(client, data.handle);
break;
}
case ION_IOC_MAP:
case ION_IOC_SHARE:
{
struct ion_fd_data data;
if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
return -EFAULT;
mutex_lock(&client->lock);
if (!ion_handle_validate(client, data.handle)) {
pr_err("%s: invalid handle passed to share ioctl.\n",
__func__);
mutex_unlock(&client->lock);
return -EINVAL;
}
data.fd = ion_ioctl_share(filp, client, data.handle);
mutex_unlock(&client->lock);
if (copy_to_user((void __user *)arg, &data, sizeof(data)))
return -EFAULT;
break;
}
case ION_IOC_IMPORT:
{
struct ion_fd_data data;
if (copy_from_user(&data, (void __user *)arg,
sizeof(struct ion_fd_data)))
return -EFAULT;
data.handle = ion_import_fd(client, data.fd);
if (IS_ERR(data.handle))
data.handle = NULL;
if (copy_to_user((void __user *)arg, &data,
sizeof(struct ion_fd_data)))
return -EFAULT;
break;
}
case ION_IOC_CUSTOM:
{
struct ion_device *dev = client->dev;
struct ion_custom_data data;
if (!dev->custom_ioctl)
return -ENOTTY;
if (copy_from_user(&data, (void __user *)arg,
sizeof(struct ion_custom_data)))
return -EFAULT;
return dev->custom_ioctl(client, data.cmd, data.arg);
}
default:
return -ENOTTY;
}
return 0;
}
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_put(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;
pr_debug("%s: %d\n", __func__, __LINE__);
client = ion_client_create(dev, -1, "user");
if (IS_ERR_OR_NULL(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,
};
static size_t ion_debug_heap_total(struct ion_client *client,
enum ion_heap_type type)
{
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->type == type)
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;
seq_printf(s, "%16.s %16.s %16.s\n", "client", "pid", "size");
for (n = rb_first(&dev->user_clients); n; n = rb_next(n)) {
struct ion_client *client = rb_entry(n, struct ion_client,
node);
char task_comm[TASK_COMM_LEN];
size_t size = ion_debug_heap_total(client, heap->type);
if (!size)
continue;
get_task_comm(task_comm, client->task);
seq_printf(s, "%16.s %16u %16u\n", task_comm, client->pid,
size);
}
for (n = rb_first(&dev->kernel_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->type);
if (!size)
continue;
seq_printf(s, "%16.s %16u %16u\n", client->name, client->pid,
size);
}
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,
};
void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
{
struct rb_node **p = &dev->heaps.rb_node;
struct rb_node *parent = NULL;
struct ion_heap *entry;
heap->dev = dev;
mutex_lock(&dev->lock);
while (*p) {
parent = *p;
entry = rb_entry(parent, struct ion_heap, node);
if (heap->id < entry->id) {
p = &(*p)->rb_left;
} else if (heap->id > entry->id ) {
p = &(*p)->rb_right;
} else {
pr_err("%s: can not insert multiple heaps with "
"id %d\n", __func__, heap->id);
goto end;
}
}
rb_link_node(&heap->node, parent, p);
rb_insert_color(&heap->node, &dev->heaps);
debugfs_create_file(heap->name, 0664, dev->debug_root, heap,
&debug_heap_fops);
end:
mutex_unlock(&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 (IS_ERR_OR_NULL(idev->debug_root))
pr_err("ion: failed to create debug files.\n");
idev->custom_ioctl = custom_ioctl;
idev->buffers = RB_ROOT;
mutex_init(&idev->lock);
idev->heaps = RB_ROOT;
idev->user_clients = RB_ROOT;
idev->kernel_clients = RB_ROOT;
return idev;
}
void ion_device_destroy(struct ion_device *dev)
{
misc_deregister(&dev->dev);
/* XXX need to free the heaps and clients ? */
kfree(dev);
}