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staging: android: ion: Add ioctl to query available heaps

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Ion clients currently lack a good method to determine what
heaps are available and what ids they map to. This leads
to tight coupling between user and kernel space and headaches.
Add a query ioctl to let userspace know the availability of
heaps.

Signed-off-by: Laura Abbott <labbott@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laura Abbott 2016-09-07 11:49:59 -07:00 committed by Greg Kroah-Hartman
parent bef611a92e
commit 02b23803c6
4 changed files with 128 additions and 10 deletions
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53
drivers/staging/android/ion/ion-ioctl.c
View File

@ -22,6 +22,31 @@
#include "ion_priv.h"
#include "compat_ion.h"
union ion_ioctl_arg {
struct ion_fd_data fd;
struct ion_allocation_data allocation;
struct ion_handle_data handle;
struct ion_custom_data custom;
struct ion_heap_query query;
};
static int validate_ioctl_arg(unsigned int cmd, union ion_ioctl_arg *arg)
{
int ret = 0;
switch (cmd) {
case ION_IOC_HEAP_QUERY:
ret = arg->query.reserved0 != 0;
ret |= arg->query.reserved1 != 0;
ret |= arg->query.reserved2 != 0;
break;
default:
break;
}
return ret ? -EINVAL : 0;
}
/* fix up the cases where the ioctl direction bits are incorrect */
static unsigned int ion_ioctl_dir(unsigned int cmd)
{
@ -42,22 +67,27 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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;
union ion_ioctl_arg 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;
/*
* The copy_from_user is unconditional here for both read and write
* to do the validate. If there is no write for the ioctl, the
* buffer is cleared
*/
if (copy_from_user(&data, (void __user *)arg, _IOC_SIZE(cmd)))
return -EFAULT;
ret = validate_ioctl_arg(cmd, &data);
if (WARN_ON_ONCE(ret))
return ret;
if (!(dir & _IOC_WRITE))
memset(&data, 0, sizeof(data));
switch (cmd) {
case ION_IOC_ALLOC:
@ -129,6 +159,9 @@ long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
data.custom.arg);
break;
}
case ION_IOC_HEAP_QUERY:
ret = ion_query_heaps(client, &data.query);
break;
default:
return -ENOTTY;
}

43
drivers/staging/android/ion/ion.c
View File

@ -1159,6 +1159,48 @@ int ion_sync_for_device(struct ion_client *client, int fd)
return 0;
}
int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query)
{
struct ion_device *dev = client->dev;
struct ion_heap_data __user *buffer = u64_to_user_ptr(query->heaps);
int ret = -EINVAL, cnt = 0, max_cnt;
struct ion_heap *heap;
struct ion_heap_data hdata;
memset(&hdata, 0, sizeof(hdata));
down_read(&dev->lock);
if (!buffer) {
query->cnt = dev->heap_cnt;
ret = 0;
goto out;
}
if (query->cnt <= 0)
goto out;
max_cnt = query->cnt;
plist_for_each_entry(heap, &dev->heaps, node) {
strncpy(hdata.name, heap->name, MAX_HEAP_NAME);
hdata.name[sizeof(hdata.name) - 1] = '\0';
hdata.type = heap->type;
hdata.heap_id = heap->id;
ret = copy_to_user(&buffer[cnt],
&hdata, sizeof(hdata));
cnt++;
if (cnt >= max_cnt)
break;
}
query->cnt = cnt;
out:
up_read(&dev->lock);
return ret;
}
static int ion_release(struct inode *inode, struct file *file)
{
struct ion_client *client = file->private_data;
@ -1376,6 +1418,7 @@ void ion_device_add_heap(struct ion_device *dev, struct ion_heap *heap)
}
}
dev->heap_cnt++;
up_write(&dev->lock);
}
EXPORT_SYMBOL(ion_device_add_heap);

3
drivers/staging/android/ion/ion_priv.h
View File

@ -102,6 +102,7 @@ struct ion_device {
struct dentry *debug_root;
struct dentry *heaps_debug_root;
struct dentry *clients_debug_root;
int heap_cnt;
};
/**
@ -467,4 +468,6 @@ struct ion_handle *ion_handle_get_by_id(struct ion_client *client,
int ion_handle_put(struct ion_handle *handle);
int ion_query_heaps(struct ion_client *client, struct ion_heap_query *query);
#endif /* _ION_PRIV_H */

39
drivers/staging/android/uapi/ion.h
View File

@ -128,6 +128,36 @@ struct ion_custom_data {
unsigned long arg;
};
#define MAX_HEAP_NAME 32
/**
* struct ion_heap_data - data about a heap
* @name - first 32 characters of the heap name
* @type - heap type
* @heap_id - heap id for the heap
*/
struct ion_heap_data {
char name[MAX_HEAP_NAME];
__u32 type;
__u32 heap_id;
__u32 reserved0;
__u32 reserved1;
__u32 reserved2;
};
/**
* struct ion_heap_query - collection of data about all heaps
* @cnt - total number of heaps to be copied
* @heaps - buffer to copy heap data
*/
struct ion_heap_query {
__u32 cnt; /* Total number of heaps to be copied */
__u32 reserved0; /* align to 64bits */
__u64 heaps; /* buffer to be populated */
__u32 reserved1;
__u32 reserved2;
};
#define ION_IOC_MAGIC 'I'
/**
@ -194,4 +224,13 @@ struct ion_custom_data {
*/
#define ION_IOC_CUSTOM _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data)
/**
* DOC: ION_IOC_HEAP_QUERY - information about available heaps
*
* Takes an ion_heap_query structure and populates information about
* available Ion heaps.
*/
#define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, \
struct ion_heap_query)
#endif /* _UAPI_LINUX_ION_H */