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SubjectRe: [Linaro-mm-sig] [PATCHv4 10/12] staging: android: ion: Remove ion_handle and ion_client
On Tue, Apr 18, 2017 at 11:27:12AM -0700, Laura Abbott wrote:
> ion_handle was introduced as an abstraction to represent a reference to
> a buffer via an ion_client. As frameworks outside of Ion evolved, the dmabuf
> emerged as the preferred standard for use in the kernel. This has made
> the ion_handle an unnecessary abstraction and prone to race
> conditions. ion_client is also now only used internally. We have enough
> mechanisms for race conditions and leaks already so just drop ion_handle
> and ion_client. This also includes ripping out most of the debugfs
> infrastructure since much of that was tied to clients and handles.
> The debugfs infrastructure was prone to give confusing data (orphaned
> allocations) so it can be replaced with something better if people
> actually want it.
>
> Signed-off-by: Laura Abbott <labbott@redhat.com>

Yeah I think improving the dma-buf debugfs stuff (maybe with an allocator
callback to dump additional data) is the better option.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
> drivers/staging/android/ion/ion-ioctl.c | 53 +--
> drivers/staging/android/ion/ion.c | 701 ++------------------------------
> drivers/staging/android/ion/ion.h | 77 +---
> drivers/staging/android/uapi/ion.h | 25 +-
> 4 files changed, 51 insertions(+), 805 deletions(-)
>
> diff --git a/drivers/staging/android/ion/ion-ioctl.c b/drivers/staging/android/ion/ion-ioctl.c
> index 4e7bf16..76427e4 100644
> --- a/drivers/staging/android/ion/ion-ioctl.c
> +++ b/drivers/staging/android/ion/ion-ioctl.c
> @@ -21,9 +21,7 @@
> #include "ion.h"
>
> union ion_ioctl_arg {
> - struct ion_fd_data fd;
> struct ion_allocation_data allocation;
> - struct ion_handle_data handle;
> struct ion_heap_query query;
> };
>
> @@ -48,8 +46,6 @@ static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
> static unsigned int ion_ioctl_dir(unsigned int cmd)
> {
> switch (cmd) {
> - case ION_IOC_FREE:
> - return _IOC_WRITE;
> default:
> return _IOC_DIR(cmd);
> }
> @@ -57,8 +53,6 @@ static unsigned int ion_ioctl_dir(unsigned int cmd)
>
> long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> {
> - struct ion_client *client = filp->private_data;
> - struct ion_handle *cleanup_handle = NULL;
> int ret = 0;
> unsigned int dir;
> union ion_ioctl_arg data;
> @@ -86,61 +80,28 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> switch (cmd) {
> case ION_IOC_ALLOC:
> {
> - struct ion_handle *handle;
> + int fd;
>
> - handle = ion_alloc(client, data.allocation.len,
> + fd = ion_alloc(data.allocation.len,
> data.allocation.heap_id_mask,
> data.allocation.flags);
> - if (IS_ERR(handle))
> - return PTR_ERR(handle);
> + if (fd < 0)
> + return fd;
>
> - data.allocation.handle = handle->id;
> + data.allocation.fd = fd;
>
> - cleanup_handle = handle;
> - break;
> - }
> - case ION_IOC_FREE:
> - {
> - struct ion_handle *handle;
> -
> - mutex_lock(&client->lock);
> - handle = ion_handle_get_by_id_nolock(client,
> - data.handle.handle);
> - if (IS_ERR(handle)) {
> - mutex_unlock(&client->lock);
> - return PTR_ERR(handle);
> - }
> - ion_free_nolock(client, handle);
> - ion_handle_put_nolock(handle);
> - mutex_unlock(&client->lock);
> - break;
> - }
> - case ION_IOC_SHARE:
> - {
> - 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_HEAP_QUERY:
> - ret = ion_query_heaps(client, &data.query);
> + ret = ion_query_heaps(&data.query);
> 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);
> + if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd)))
> return -EFAULT;
> - }
> }
> return ret;
> }
> diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
> index 5a82bea..9eeb06f 100644
> --- a/drivers/staging/android/ion/ion.c
> +++ b/drivers/staging/android/ion/ion.c
> @@ -90,7 +90,6 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
>
> buffer->heap = heap;
> buffer->flags = flags;
> - kref_init(&buffer->ref);
>
> ret = heap->ops->allocate(heap, buffer, len, flags);
>
> @@ -140,9 +139,8 @@ void ion_buffer_destroy(struct ion_buffer *buffer)
> kfree(buffer);
> }
>
> -static void _ion_buffer_destroy(struct kref *kref)
> +static void _ion_buffer_destroy(struct ion_buffer *buffer)
> {
> - struct ion_buffer *buffer = container_of(kref, struct ion_buffer, ref);
> struct ion_heap *heap = buffer->heap;
> struct ion_device *dev = buffer->dev;
>
> @@ -156,255 +154,6 @@ static void _ion_buffer_destroy(struct kref *kref)
> 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(*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);
> -}
> -
> -static void ion_handle_get(struct ion_handle *handle)
> -{
> - kref_get(&handle->ref);
> -}
> -
> -int ion_handle_put_nolock(struct ion_handle *handle)
> -{
> - return kref_put(&handle->ref, ion_handle_destroy);
> -}
> -
> -int ion_handle_put(struct ion_handle *handle)
> -{
> - struct ion_client *client = handle->client;
> - int ret;
> -
> - mutex_lock(&client->lock);
> - ret = ion_handle_put_nolock(handle);
> - mutex_unlock(&client->lock);
> -
> - return ret;
> -}
> -
> -struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
> - int id)
> -{
> - struct ion_handle *handle;
> -
> - handle = idr_find(&client->idr, id);
> - if (handle)
> - ion_handle_get(handle);
> -
> - return handle ? handle : ERR_PTR(-EINVAL);
> -}
> -
> -struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
> - int id)
> -{
> - struct ion_handle *handle;
> -
> - mutex_lock(&client->lock);
> - handle = ion_handle_get_by_id_nolock(client, id);
> - mutex_unlock(&client->lock);
> -
> - return handle;
> -}
> -
> -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,
> - 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 heap_id_mask %u flags %x\n", __func__,
> - len, 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, 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_nolock(struct ion_client *client,
> - struct ion_handle *handle)
> -{
> - if (!ion_handle_validate(client, handle)) {
> - WARN(1, "%s: invalid handle passed to free.\n", __func__);
> - return;
> - }
> - ion_handle_put_nolock(handle);
> -}
> -
> -void ion_free(struct ion_client *client, struct ion_handle *handle)
> -{
> - BUG_ON(client != handle->client);
> -
> - mutex_lock(&client->lock);
> - ion_free_nolock(client, handle);
> - mutex_unlock(&client->lock);
> -}
> -EXPORT_SYMBOL(ion_free);
> -
> static void *ion_buffer_kmap_get(struct ion_buffer *buffer)
> {
> void *vaddr;
> @@ -433,234 +182,6 @@ static void ion_buffer_kmap_put(struct ion_buffer *buffer)
> }
> }
>
> -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);
> -}
> -
> -static struct mutex debugfs_mutex;
> -static struct rb_root *ion_root_client;
> -static int is_client_alive(struct ion_client *client)
> -{
> - struct rb_node *node;
> - struct ion_client *tmp;
> - struct ion_device *dev;
> -
> - node = ion_root_client->rb_node;
> - dev = container_of(ion_root_client, struct ion_device, clients);
> -
> - down_read(&dev->lock);
> - while (node) {
> - tmp = rb_entry(node, struct ion_client, node);
> - if (client < tmp) {
> - node = node->rb_left;
> - } else if (client > tmp) {
> - node = node->rb_right;
> - } else {
> - up_read(&dev->lock);
> - return 1;
> - }
> - }
> -
> - up_read(&dev->lock);
> - return 0;
> -}
> -
> -static int ion_debug_client_show(struct seq_file *s, void *unused)
> -{
> - struct ion_client *client = s->private;
> - struct rb_node *n;
> - size_t sizes[ION_NUM_HEAP_IDS] = {0};
> - const char *names[ION_NUM_HEAP_IDS] = {NULL};
> - int i;
> -
> - mutex_lock(&debugfs_mutex);
> - if (!is_client_alive(client)) {
> - seq_printf(s, "ion_client 0x%p dead, can't dump its buffers\n",
> - client);
> - mutex_unlock(&debugfs_mutex);
> - return 0;
> - }
> -
> - mutex_lock(&client->lock);
> - for (n = rb_first(&client->handles); n; n = rb_next(n)) {
> - struct ion_handle *handle = rb_entry(n, struct ion_handle,
> - node);
> - unsigned int id = handle->buffer->heap->id;
> -
> - if (!names[id])
> - names[id] = handle->buffer->heap->name;
> - sizes[id] += handle->buffer->size;
> - }
> - mutex_unlock(&client->lock);
> - mutex_unlock(&debugfs_mutex);
> -
> - seq_printf(s, "%16.16s: %16.16s\n", "heap_name", "size_in_bytes");
> - for (i = 0; i < ION_NUM_HEAP_IDS; i++) {
> - if (!names[i])
> - continue;
> - seq_printf(s, "%16.16s: %16zu\n", names[i], sizes[i]);
> - }
> - return 0;
> -}
> -
> -static int ion_debug_client_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, ion_debug_client_show, inode->i_private);
> -}
> -
> -static const struct file_operations debug_client_fops = {
> - .open = ion_debug_client_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> -
> -static int ion_get_client_serial(const struct rb_root *root,
> - const unsigned char *name)
> -{
> - int serial = -1;
> - struct rb_node *node;
> -
> - for (node = rb_first(root); node; node = rb_next(node)) {
> - struct ion_client *client = rb_entry(node, struct ion_client,
> - node);
> -
> - if (strcmp(client->name, name))
> - continue;
> - serial = max(serial, client->display_serial);
> - }
> - return serial + 1;
> -}
> -
> -struct ion_client *ion_client_create(struct ion_device *dev,
> - const char *name)
> -{
> - struct ion_client *client;
> - struct task_struct *task;
> - struct rb_node **p;
> - struct rb_node *parent = NULL;
> - struct ion_client *entry;
> - pid_t pid;
> -
> - if (!name) {
> - pr_err("%s: Name cannot be null\n", __func__);
> - return ERR_PTR(-EINVAL);
> - }
> -
> - get_task_struct(current->group_leader);
> - task_lock(current->group_leader);
> - pid = task_pid_nr(current->group_leader);
> - /*
> - * don't bother to store task struct for kernel threads,
> - * they can't be killed anyway
> - */
> - if (current->group_leader->flags & PF_KTHREAD) {
> - put_task_struct(current->group_leader);
> - task = NULL;
> - } else {
> - task = current->group_leader;
> - }
> - task_unlock(current->group_leader);
> -
> - client = kzalloc(sizeof(*client), GFP_KERNEL);
> - if (!client)
> - goto err_put_task_struct;
> -
> - client->dev = dev;
> - client->handles = RB_ROOT;
> - idr_init(&client->idr);
> - mutex_init(&client->lock);
> - client->task = task;
> - client->pid = pid;
> - client->name = kstrdup(name, GFP_KERNEL);
> - if (!client->name)
> - goto err_free_client;
> -
> - down_write(&dev->lock);
> - client->display_serial = ion_get_client_serial(&dev->clients, name);
> - client->display_name = kasprintf(
> - GFP_KERNEL, "%s-%d", name, client->display_serial);
> - if (!client->display_name) {
> - up_write(&dev->lock);
> - goto err_free_client_name;
> - }
> - p = &dev->clients.rb_node;
> - while (*p) {
> - parent = *p;
> - entry = rb_entry(parent, struct ion_client, node);
> -
> - if (client < entry)
> - p = &(*p)->rb_left;
> - else if (client > entry)
> - p = &(*p)->rb_right;
> - }
> - rb_link_node(&client->node, parent, p);
> - rb_insert_color(&client->node, &dev->clients);
> -
> - client->debug_root = debugfs_create_file(client->display_name, 0664,
> - dev->clients_debug_root,
> - client, &debug_client_fops);
> - if (!client->debug_root) {
> - char buf[256], *path;
> -
> - path = dentry_path(dev->clients_debug_root, buf, 256);
> - pr_err("Failed to create client debugfs at %s/%s\n",
> - path, client->display_name);
> - }
> -
> - up_write(&dev->lock);
> -
> - return client;
> -
> -err_free_client_name:
> - kfree(client->name);
> -err_free_client:
> - kfree(client);
> -err_put_task_struct:
> - if (task)
> - put_task_struct(current->group_leader);
> - return ERR_PTR(-ENOMEM);
> -}
> -EXPORT_SYMBOL(ion_client_create);
> -
> -void ion_client_destroy(struct ion_client *client)
> -{
> - struct ion_device *dev = client->dev;
> - struct rb_node *n;
> -
> - pr_debug("%s: %d\n", __func__, __LINE__);
> - mutex_lock(&debugfs_mutex);
> - while ((n = rb_first(&client->handles))) {
> - struct ion_handle *handle = rb_entry(n, struct ion_handle,
> - node);
> - ion_handle_destroy(&handle->ref);
> - }
> -
> - idr_destroy(&client->idr);
> -
> - down_write(&dev->lock);
> - if (client->task)
> - put_task_struct(client->task);
> - rb_erase(&client->node, &dev->clients);
> - debugfs_remove_recursive(client->debug_root);
> - up_write(&dev->lock);
> -
> - kfree(client->display_name);
> - kfree(client->name);
> - kfree(client);
> - mutex_unlock(&debugfs_mutex);
> -}
> -EXPORT_SYMBOL(ion_client_destroy);
> -
> static struct sg_table *dup_sg_table(struct sg_table *table)
> {
> struct sg_table *new_table;
> @@ -802,7 +323,7 @@ static void ion_dma_buf_release(struct dma_buf *dmabuf)
> {
> struct ion_buffer *buffer = dmabuf->priv;
>
> - ion_buffer_put(buffer);
> + _ion_buffer_destroy(buffer);
> }
>
> static void *ion_dma_buf_kmap(struct dma_buf *dmabuf, unsigned long offset)
> @@ -881,24 +402,44 @@ static const struct dma_buf_ops dma_buf_ops = {
> .kunmap = ion_dma_buf_kunmap,
> };
>
> -struct dma_buf *ion_share_dma_buf(struct ion_client *client,
> - struct ion_handle *handle)
> +int ion_alloc(size_t len, unsigned int heap_id_mask, unsigned int flags)
> {
> + struct ion_device *dev = internal_dev;
> + struct ion_buffer *buffer = NULL;
> + struct ion_heap *heap;
> DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> - struct ion_buffer *buffer;
> + int fd;
> 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);
> + pr_debug("%s: len %zu heap_id_mask %u flags %x\n", __func__,
> + len, 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 -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, flags);
> + if (!IS_ERR(buffer))
> + break;
> }
> - buffer = handle->buffer;
> - ion_buffer_get(buffer);
> - mutex_unlock(&client->lock);
> + up_read(&dev->lock);
> +
> + if (buffer == NULL)
> + return -ENODEV;
> +
> + if (IS_ERR(buffer))
> + return PTR_ERR(buffer);
>
> exp_info.ops = &dma_buf_ops;
> exp_info.size = buffer->size;
> @@ -907,22 +448,9 @@ struct dma_buf *ion_share_dma_buf(struct ion_client *client,
>
> 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))
> + _ion_buffer_destroy(buffer);
> return PTR_ERR(dmabuf);
> + }
>
> fd = dma_buf_fd(dmabuf, O_CLOEXEC);
> if (fd < 0)
> @@ -930,11 +458,10 @@ int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle)
>
> return fd;
> }
> -EXPORT_SYMBOL(ion_share_dma_buf_fd);
>
> -int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
> +int ion_query_heaps(struct ion_heap_query *query)
> {
> - struct ion_device *dev = client->dev;
> + struct ion_device *dev = internal_dev;
> struct ion_heap_data __user *buffer = u64_to_user_ptr(query->heaps);
> int ret = -EINVAL, cnt = 0, max_cnt;
> struct ion_heap *heap;
> @@ -976,137 +503,14 @@ int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
> 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,
> #ifdef CONFIG_COMPAT
> .compat_ioctl = ion_ioctl,
> #endif
> };
>
> -static size_t ion_debug_heap_total(struct ion_client *client,
> - unsigned int id)
> -{
> - size_t size = 0;
> - struct rb_node *n;
> -
> - mutex_lock(&client->lock);
> - for (n = rb_first(&client->handles); n; n = rb_next(n)) {
> - struct ion_handle *handle = rb_entry(n,
> - struct ion_handle,
> - node);
> - if (handle->buffer->heap->id == id)
> - size += handle->buffer->size;
> - }
> - mutex_unlock(&client->lock);
> - return size;
> -}
> -
> -static int ion_debug_heap_show(struct seq_file *s, void *unused)
> -{
> - struct ion_heap *heap = s->private;
> - struct ion_device *dev = heap->dev;
> - struct rb_node *n;
> - size_t total_size = 0;
> - size_t total_orphaned_size = 0;
> -
> - seq_printf(s, "%16s %16s %16s\n", "client", "pid", "size");
> - seq_puts(s, "----------------------------------------------------\n");
> -
> - mutex_lock(&debugfs_mutex);
> - for (n = rb_first(&dev->clients); n; n = rb_next(n)) {
> - struct ion_client *client = rb_entry(n, struct ion_client,
> - node);
> - size_t size = ion_debug_heap_total(client, heap->id);
> -
> - if (!size)
> - continue;
> - if (client->task) {
> - char task_comm[TASK_COMM_LEN];
> -
> - get_task_comm(task_comm, client->task);
> - seq_printf(s, "%16s %16u %16zu\n", task_comm,
> - client->pid, size);
> - } else {
> - seq_printf(s, "%16s %16u %16zu\n", client->name,
> - client->pid, size);
> - }
> - }
> - mutex_unlock(&debugfs_mutex);
> -
> - seq_puts(s, "----------------------------------------------------\n");
> - seq_puts(s, "orphaned allocations (info is from last known client):\n");
> - mutex_lock(&dev->buffer_lock);
> - for (n = rb_first(&dev->buffers); n; n = rb_next(n)) {
> - struct ion_buffer *buffer = rb_entry(n, struct ion_buffer,
> - node);
> - if (buffer->heap->id != heap->id)
> - continue;
> - total_size += buffer->size;
> - if (!buffer->handle_count) {
> - seq_printf(s, "%16s %16u %16zu %d %d\n",
> - buffer->task_comm, buffer->pid,
> - buffer->size, buffer->kmap_cnt,
> - kref_read(&buffer->ref));
> - total_orphaned_size += buffer->size;
> - }
> - }
> - mutex_unlock(&dev->buffer_lock);
> - seq_puts(s, "----------------------------------------------------\n");
> - seq_printf(s, "%16s %16zu\n", "total orphaned",
> - total_orphaned_size);
> - seq_printf(s, "%16s %16zu\n", "total ", total_size);
> - if (heap->flags & ION_HEAP_FLAG_DEFER_FREE)
> - seq_printf(s, "%16s %16zu\n", "deferred free",
> - heap->free_list_size);
> - seq_puts(s, "----------------------------------------------------\n");
> -
> - if (heap->debug_show)
> - heap->debug_show(heap, s, unused);
> -
> - return 0;
> -}
> -
> -static int ion_debug_heap_open(struct inode *inode, struct file *file)
> -{
> - return single_open(file, ion_debug_heap_show, inode->i_private);
> -}
> -
> -static const struct file_operations debug_heap_fops = {
> - .open = ion_debug_heap_open,
> - .read = seq_read,
> - .llseek = seq_lseek,
> - .release = single_release,
> -};
> -
> static int debug_shrink_set(void *data, u64 val)
> {
> struct ion_heap *heap = data;
> @@ -1169,29 +573,18 @@ void ion_device_add_heap(struct ion_heap *heap)
> */
> 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_name, 0644, dev->debug_root, heap,
> &debug_shrink_fops);
> if (!debug_file) {
> char buf[256], *path;
>
> - path = dentry_path(dev->heaps_debug_root, buf, 256);
> + path = dentry_path(dev->debug_root, buf, 256);
> pr_err("Failed to create heap shrinker debugfs at %s/%s\n",
> path, debug_name);
> }
> @@ -1227,24 +620,12 @@ int ion_device_create(void)
> 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->buffers = RB_ROOT;
> mutex_init(&idev->buffer_lock);
> init_rwsem(&idev->lock);
> plist_head_init(&idev->heaps);
> - idev->clients = RB_ROOT;
> - ion_root_client = &idev->clients;
> - mutex_init(&debugfs_mutex);
> internal_dev = idev;
> return 0;
> }
> diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
> index 36a1587..ace8416 100644
> --- a/drivers/staging/android/ion/ion.h
> +++ b/drivers/staging/android/ion/ion.h
> @@ -78,7 +78,6 @@ struct ion_platform_heap {
> * handle, used for debugging
> */
> struct ion_buffer {
> - struct kref ref;
> union {
> struct rb_node node;
> struct list_head list;
> @@ -109,8 +108,6 @@ void ion_buffer_destroy(struct ion_buffer *buffer);
> * @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;
> @@ -118,65 +115,11 @@ struct ion_device {
> struct mutex buffer_lock;
> struct rw_semaphore lock;
> struct plist_head heaps;
> - struct rb_root clients;
> struct dentry *debug_root;
> - struct dentry *heaps_debug_root;
> - struct dentry *clients_debug_root;
> int heap_cnt;
> };
>
> /**
> - * 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;
> -};
> -
> -/**
> * struct ion_heap_ops - ops to operate on a given heap
> * @allocate: allocate memory
> * @free: free memory
> @@ -296,14 +239,10 @@ int ion_heap_map_user(struct ion_heap *heap, struct ion_buffer *buffer,
> int ion_heap_buffer_zero(struct ion_buffer *buffer);
> int ion_heap_pages_zero(struct page *page, size_t size, pgprot_t pgprot);
>
> -struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
> +int ion_alloc(size_t len,
> unsigned int heap_id_mask,
> unsigned int flags);
>
> -void ion_free(struct ion_client *client, struct ion_handle *handle);
> -
> -int ion_share_dma_buf_fd(struct ion_client *client, struct ion_handle *handle);
> -
> /**
> * ion_heap_init_shrinker
> * @heap: the heap
> @@ -431,18 +370,6 @@ int ion_page_pool_shrink(struct ion_page_pool *pool, gfp_t gfp_mask,
>
> long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
>
> -struct ion_handle *ion_handle_get_by_id_nolock(struct ion_client *client,
> - int id);
> -
> -void ion_free_nolock(struct ion_client *client, struct ion_handle *handle);
> -
> -int ion_handle_put_nolock(struct ion_handle *handle);
> -
> -struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
> - int id);
> -
> -int ion_handle_put(struct ion_handle *handle);
> -
> -int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query);
> +int ion_query_heaps(struct ion_heap_query *query);
>
> #endif /* _ION_H */
> diff --git a/drivers/staging/android/uapi/ion.h b/drivers/staging/android/uapi/ion.h
> index bba1c47..b76db1b 100644
> --- a/drivers/staging/android/uapi/ion.h
> +++ b/drivers/staging/android/uapi/ion.h
> @@ -85,31 +85,8 @@ struct ion_allocation_data {
> __u64 len;
> __u32 heap_id_mask;
> __u32 flags;
> - __u32 handle;
> - __u32 unused;
> -};
> -
> -/**
> - * struct ion_fd_data - metadata passed to/from userspace for a handle/fd pair
> - * @handle: a handle
> - * @fd: a file descriptor representing that handle
> - *
> - * For ION_IOC_SHARE or ION_IOC_MAP userspace populates the handle field with
> - * the handle returned from ion alloc, and the kernel returns the file
> - * descriptor to share or map in the fd field. For ION_IOC_IMPORT, userspace
> - * provides the file descriptor and the kernel returns the handle.
> - */
> -struct ion_fd_data {
> - __u32 handle;
> __u32 fd;
> -};
> -
> -/**
> - * struct ion_handle_data - a handle passed to/from the kernel
> - * @handle: a handle
> - */
> -struct ion_handle_data {
> - __u32 handle;
> + __u32 unused;
> };
>
> #define MAX_HEAP_NAME 32
> --
> 2.7.4
>
> _______________________________________________
> Linaro-mm-sig mailing list
> Linaro-mm-sig@lists.linaro.org
> https://lists.linaro.org/mailman/listinfo/linaro-mm-sig

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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