/drivers/gpu/ion/ion.c
https://bitbucket.org/wisechild/galaxy-nexus · C · 1186 lines · 941 code · 151 blank · 94 comment · 129 complexity · f334c5f289f4de1c8a149e66a032bc2d MD5 · raw file
- /*
- * 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/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);
- }