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vfio: platform: add capability to register a reset function

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In preparation for subsequent changes in reset function lookup,
lets introduce a dynamic list of reset combos (compat string,
reset module, reset function). The list can be populated/voided with
vfio_platform_register/unregister_reset. Those are not yet used in
this patch.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Eric Auger 2015-11-03 18:12:13 +00:00 committed by Alex Williamson
parent 32a2d71c4e
commit e086497d31
2 changed files with 47 additions and 0 deletions
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27
drivers/vfio/platform/vfio_platform_common.c
View File

@ -27,6 +27,7 @@
#define DRIVER_AUTHOR "Antonios Motakis <a.motakis@virtualopensystems.com>"
#define DRIVER_DESC "VFIO platform base module"
static LIST_HEAD(reset_list);
static DEFINE_MUTEX(driver_lock);
static const struct vfio_platform_reset_combo reset_lookup_table[] = {
@ -578,6 +579,32 @@ struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
}
EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
void __vfio_platform_register_reset(struct vfio_platform_reset_node *node)
{
mutex_lock(&driver_lock);
list_add(&node->link, &reset_list);
mutex_unlock(&driver_lock);
}
EXPORT_SYMBOL_GPL(__vfio_platform_register_reset);
void vfio_platform_unregister_reset(const char *compat,
vfio_platform_reset_fn_t fn)
{
struct vfio_platform_reset_node *iter, *temp;
mutex_lock(&driver_lock);
list_for_each_entry_safe(iter, temp, &reset_list, link) {
if (!strcmp(iter->compat, compat) && (iter->reset == fn)) {
list_del(&iter->link);
break;
}
}
mutex_unlock(&driver_lock);
}
EXPORT_SYMBOL_GPL(vfio_platform_unregister_reset);
MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);

20
drivers/vfio/platform/vfio_platform_private.h
View File

@ -71,6 +71,15 @@ struct vfio_platform_device {
int (*reset)(struct vfio_platform_device *vdev);
};
typedef int (*vfio_platform_reset_fn_t)(struct vfio_platform_device *vdev);
struct vfio_platform_reset_node {
struct list_head link;
char *compat;
struct module *owner;
vfio_platform_reset_fn_t reset;
};
struct vfio_platform_reset_combo {
const char *compat;
const char *reset_function_name;
@ -90,4 +99,15 @@ extern int vfio_platform_set_irqs_ioctl(struct vfio_platform_device *vdev,
unsigned start, unsigned count,
void *data);
extern void __vfio_platform_register_reset(struct vfio_platform_reset_node *n);
extern void vfio_platform_unregister_reset(const char *compat,
vfio_platform_reset_fn_t fn);
#define vfio_platform_register_reset(__compat, __reset) \
static struct vfio_platform_reset_node __reset ## _node = { \
.owner = THIS_MODULE, \
.compat = __compat, \
.reset = __reset, \
}; \
__vfio_platform_register_reset(&__reset ## _node)
#endif /* VFIO_PLATFORM_PRIVATE_H */