| /* |
| * |
| * 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)) { |
| ret = -EINVAL; |
| goto err1; |
| } |
| |
| 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 err; |
| } |
| |
| 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++; |
| } |
| } |
| |
| 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); |
| sg_dma_len(sg) = sg->length; |
| } |
| mutex_lock(&dev->buffer_lock); |
| ion_buffer_add(dev, buffer); |
| mutex_unlock(&dev->buffer_lock); |
| return buffer; |
| |
| err: |
| heap->ops->unmap_dma(heap, buffer); |
| err1: |
| heap->ops->free(buffer); |
| 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); |
| 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 (name=%s, type=%d).\n", |
| __func__, buffer->heap->name, buffer->heap->type); |
| 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 const struct vm_operations_struct ion_vma_ops = { |
| .open = ion_vm_open, |
| .close = ion_vm_close, |
| .fault = ion_vm_fault, |
| }; |
| |
| static int ion_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) |
| { |
| struct ion_buffer *buffer = dmabuf->priv; |
| int ret = 0; |
| |
| if (!buffer->heap->ops->map_user) { |
| pr_err("%s: this heap does not define a method for mapping to userspace\n", |
| __func__); |
| return -EINVAL; |
| } |
| |
| if (ion_buffer_fault_user_mappings(buffer)) { |
| vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | |
| VM_DONTDUMP; |
| vma->vm_private_data = buffer; |
| vma->vm_ops = &ion_vma_ops; |
| ion_vm_open(vma); |
| return 0; |
| } |
| |
| if (!(buffer->flags & ION_FLAG_CACHED)) |
| vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
| |
| mutex_lock(&buffer->lock); |
| /* now map it to userspace */ |
| ret = buffer->heap->ops->map_user(buffer->heap, buffer, vma); |
| mutex_unlock(&buffer->lock); |
| |
| if (ret) |
| pr_err("%s: failure mapping buffer to userspace\n", |
| __func__); |
| |
| return ret; |
| } |
| |
| static void ion_dma_buf_release(struct dma_buf *dmabuf) |
| { |
| struct ion_buffer *buffer = dmabuf->priv; |
| |
| ion_buffer_put(buffer); |
| } |
| |
| static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset) |
| { |
| struct ion_buffer *buffer = dmabuf->priv; |
| |
| return buffer->vaddr + offset * PAGE_SIZE; |
| } |
| |
| static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset, |
| void *ptr) |
| { |
| } |
| |
| static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, 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) |
| { |
| DEFINE_DMA_BUF_EXPORT_INFO(exp_info); |
| struct ion_buffer *buffer; |
| struct dma_buf *dmabuf; |
| bool valid_handle; |
| |
| mutex_lock(&client->lock); |
| valid_handle = ion_handle_validate(client, handle); |
| if (!valid_handle) { |
| WARN(1, "%s: invalid handle passed to share.\n", __func__); |
| mutex_unlock(&client->lock); |
| return ERR_PTR(-EINVAL); |
| } |
| buffer = handle->buffer; |
| ion_buffer_get(buffer); |
| mutex_unlock(&client->lock); |
| |
| exp_info.ops = &dma_buf_ops; |
| exp_info.size = buffer->size; |
| exp_info.flags = O_RDWR; |
| exp_info.priv = buffer; |
| |
| dmabuf = dma_buf_export(&exp_info); |
| if (IS_ERR(dmabuf)) { |
| ion_buffer_put(buffer); |
| return dmabuf; |
| } |
| |
| return dmabuf; |
| } |
| EXPORT_SYMBOL(ion_share_dma_buf); |
| |
| int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle) |
| { |
| struct dma_buf *dmabuf; |
| int fd; |
| |
| dmabuf = ion_share_dma_buf(client, handle); |
| if (IS_ERR(dmabuf)) |
| return PTR_ERR(dmabuf); |
| |
| fd = dma_buf_fd(dmabuf, O_CLOEXEC); |
| if (fd < 0) |
| dma_buf_put(dmabuf); |
| |
| return fd; |
| } |
| EXPORT_SYMBOL(ion_share_dma_buf_fd); |
| |
| struct ion_handle *ion_import_dma_buf(struct ion_client *client, 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, "%16s %16s %16s\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, "%16s %16u %16zu\n", task_comm, |
| client->pid, size); |
| } else { |
| seq_printf(s, "%16s %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, "%16s %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, "%16s %16zu\n", "total orphaned", |
| total_orphaned_size); |
| seq_printf(s, "%16s %16zu\n", "total ", total_size); |
| if (heap->flags & ION_HEAP_FLAG_DEFER_FREE) |
| seq_printf(s, "%16s %16zu\n", "deferred free", |
| heap->free_list_size); |
| seq_puts(s, "----------------------------------------------------\n"); |
| |
| if (heap->debug_show) |
| heap->debug_show(heap, s, unused); |
| |
| return 0; |
| } |
| |
| static int ion_debug_heap_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, ion_debug_heap_show, inode->i_private); |
| } |
| |
| static const struct file_operations debug_heap_fops = { |
| .open = ion_debug_heap_open, |
| .read = seq_read, |
| .llseek = seq_lseek, |
| .release = single_release, |
| }; |
| |
| static int debug_shrink_set(void *data, u64 val) |
| { |
| struct ion_heap *heap = data; |
| struct shrink_control sc; |
| int objs; |
| |
| sc.gfp_mask = -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__); |
| |
| spin_lock_init(&heap->free_lock); |
| heap->free_list_size = 0; |
| |
| if (heap->flags & ION_HEAP_FLAG_DEFER_FREE) |
| ion_heap_init_deferred_free(heap); |
| |
| if ((heap->flags & ION_HEAP_FLAG_DEFER_FREE) || heap->ops->shrink) |
| ion_heap_init_shrinker(heap); |
| |
| heap->dev = dev; |
| down_write(&dev->lock); |
| /* |
| * use negative heap->id to reverse the priority -- when traversing |
| * the list later attempt higher id numbers first |
| */ |
| plist_node_init(&heap->node, -heap->id); |
| plist_add(&heap->node, &dev->heaps); |
| debug_file = debugfs_create_file(heap->name, 0664, |
| dev->heaps_debug_root, heap, |
| &debug_heap_fops); |
| |
| if (!debug_file) { |
| char buf[256], *path; |
| |
| path = dentry_path(dev->heaps_debug_root, buf, 256); |
| pr_err("Failed to create heap debugfs at %s/%s\n", |
| path, heap->name); |
| } |
| |
| if (heap->shrinker.count_objects && heap->shrinker.scan_objects) { |
| char debug_name[64]; |
| |
| snprintf(debug_name, 64, "%s_shrink", heap->name); |
| debug_file = debugfs_create_file( |
| debug_name, 0644, dev->heaps_debug_root, heap, |
| &debug_shrink_fops); |
| if (!debug_file) { |
| char buf[256], *path; |
| |
| path = dentry_path(dev->heaps_debug_root, buf, 256); |
| pr_err("Failed to create heap shrinker debugfs at %s/%s\n", |
| path, debug_name); |
| } |
| } |
| |
| up_write(&dev->lock); |
| } |
| EXPORT_SYMBOL(ion_device_add_heap); |
| |
| struct ion_device *ion_device_create(long (*custom_ioctl) |
| (struct ion_client *client, |
| unsigned int cmd, |
| unsigned long arg)) |
| { |
| struct ion_device *idev; |
| int ret; |
| |
| idev = kzalloc(sizeof(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"); |
| kfree(idev); |
| return ERR_PTR(ret); |
| } |
| |
| idev->debug_root = debugfs_create_dir("ion", NULL); |
| if (!idev->debug_root) { |
| pr_err("ion: failed to create debugfs root directory.\n"); |
| goto debugfs_done; |
| } |
| idev->heaps_debug_root = debugfs_create_dir("heaps", idev->debug_root); |
| if (!idev->heaps_debug_root) { |
| pr_err("ion: failed to create debugfs heaps directory.\n"); |
| goto debugfs_done; |
| } |
| idev->clients_debug_root = debugfs_create_dir("clients", |
| idev->debug_root); |
| if (!idev->clients_debug_root) |
| pr_err("ion: failed to create debugfs clients directory.\n"); |
| |
| debugfs_done: |
| |
| idev->custom_ioctl = custom_ioctl; |
| idev->buffers = RB_ROOT; |
| mutex_init(&idev->buffer_lock); |
| init_rwsem(&idev->lock); |
| plist_head_init(&idev->heaps); |
| idev->clients = RB_ROOT; |
| return idev; |
| } |
| EXPORT_SYMBOL(ion_device_create); |
| |
| void ion_device_destroy(struct ion_device *dev) |
| { |
| misc_deregister(&dev->dev); |
| debugfs_remove_recursive(dev->debug_root); |
| /* XXX need to free the heaps and clients ? */ |
| kfree(dev); |
| } |
| EXPORT_SYMBOL(ion_device_destroy); |
| |
| 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); |
| } |
| } |