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vfio: Include optional device match in vfio_device_ops callbacks 

Allow bus drivers to provide their own callback to match a device to
the user provided string.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2020-03-24 09:28:25 -06:00
parent 16fbf79b0f
commit 5f3874c2a2
2 changed files with 20 additions and 4 deletions
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20
drivers/vfio/vfio.c
View File

@ -875,11 +875,23 @@ EXPORT_SYMBOL_GPL(vfio_device_get_from_dev);
static struct vfio_device *vfio_device_get_from_name(struct vfio_group *group,
char *buf)
{
struct vfio_device *it, *device = NULL;
struct vfio_device *it, *device = ERR_PTR(-ENODEV);
mutex_lock(&group->device_lock);
list_for_each_entry(it, &group->device_list, group_next) {
if (!strcmp(dev_name(it->dev), buf)) {
int ret;
if (it->ops->match) {
ret = it->ops->match(it->device_data, buf);
if (ret < 0) {
device = ERR_PTR(ret);
break;
}
} else {
ret = !strcmp(dev_name(it->dev), buf);
}
if (ret) {
device = it;
vfio_device_get(device);
break;
@ -1430,8 +1442,8 @@ static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
return -EPERM;
device = vfio_device_get_from_name(group, buf);
if (!device)
return -ENODEV;
if (IS_ERR(device))
return PTR_ERR(device);
ret = device->ops->open(device->device_data);
if (ret) {

4
include/linux/vfio.h
View File

@ -26,6 +26,9 @@
* operations documented below
* @mmap: Perform mmap(2) on a region of the device file descriptor
* @request: Request for the bus driver to release the device
* @match: Optional device name match callback (return: 0 for no-match, >0 for
* match, -errno for abort (ex. match with insufficient or incorrect
* additional args)
*/
struct vfio_device_ops {
char *name;
@ -39,6 +42,7 @@ struct vfio_device_ops {
unsigned long arg);
int (*mmap)(void *device_data, struct vm_area_struct *vma);
void (*request)(void *device_data, unsigned int count);
int (*match)(void *device_data, char *buf);
};
extern struct iommu_group *vfio_iommu_group_get(struct device *dev);