diff options
Diffstat (limited to '')
| -rw-r--r-- | include/linux/hmm.h | 20 | ||||
| -rw-r--r-- | mm/hmm.c | 80 |
2 files changed, 0 insertions, 100 deletions
diff --git a/include/linux/hmm.h b/include/linux/hmm.h index 044a36d7c3f8..99765be3284d 100644 --- a/include/linux/hmm.h +++ b/include/linux/hmm.h @@ -751,26 +751,6 @@ static inline unsigned long hmm_devmem_page_get_drvdata(const struct page *page) { return page->hmm_data; } - - -/* - * struct hmm_device - fake device to hang device memory onto - * - * @device: device struct - * @minor: device minor number - */ -struct hmm_device { - struct device device; - unsigned int minor; -}; - -/* - * A device driver that wants to handle multiple devices memory through a - * single fake device can use hmm_device to do so. This is purely a helper and - * it is not strictly needed, in order to make use of any HMM functionality. - */ -struct hmm_device *hmm_device_new(void *drvdata); -void hmm_device_put(struct hmm_device *hmm_device); #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */ #else /* IS_ENABLED(CONFIG_HMM) */ static inline void hmm_mm_destroy(struct mm_struct *mm) {} @@ -1528,84 +1528,4 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops, return devmem; } EXPORT_SYMBOL_GPL(hmm_devmem_add_resource); - -/* - * A device driver that wants to handle multiple devices memory through a - * single fake device can use hmm_device to do so. This is purely a helper - * and it is not needed to make use of any HMM functionality. - */ -#define HMM_DEVICE_MAX 256 - -static DECLARE_BITMAP(hmm_device_mask, HMM_DEVICE_MAX); -static DEFINE_SPINLOCK(hmm_device_lock); -static struct class *hmm_device_class; -static dev_t hmm_device_devt; - -static void hmm_device_release(struct device *device) -{ - struct hmm_device *hmm_device; - - hmm_device = container_of(device, struct hmm_device, device); - spin_lock(&hmm_device_lock); - clear_bit(hmm_device->minor, hmm_device_mask); - spin_unlock(&hmm_device_lock); - - kfree(hmm_device); -} - -struct hmm_device *hmm_device_new(void *drvdata) -{ - struct hmm_device *hmm_device; - - hmm_device = kzalloc(sizeof(*hmm_device), GFP_KERNEL); - if (!hmm_device) - return ERR_PTR(-ENOMEM); - - spin_lock(&hmm_device_lock); - hmm_device->minor = find_first_zero_bit(hmm_device_mask, HMM_DEVICE_MAX); - if (hmm_device->minor >= HMM_DEVICE_MAX) { - spin_unlock(&hmm_device_lock); - kfree(hmm_device); - return ERR_PTR(-EBUSY); - } - set_bit(hmm_device->minor, hmm_device_mask); - spin_unlock(&hmm_device_lock); - - dev_set_name(&hmm_device->device, "hmm_device%d", hmm_device->minor); - hmm_device->device.devt = MKDEV(MAJOR(hmm_device_devt), - hmm_device->minor); - hmm_device->device.release = hmm_device_release; - dev_set_drvdata(&hmm_device->device, drvdata); - hmm_device->device.class = hmm_device_class; - device_initialize(&hmm_device->device); - - return hmm_device; -} -EXPORT_SYMBOL(hmm_device_new); - -void hmm_device_put(struct hmm_device *hmm_device) -{ - put_device(&hmm_device->device); -} -EXPORT_SYMBOL(hmm_device_put); - -static int __init hmm_init(void) -{ - int ret; - - ret = alloc_chrdev_region(&hmm_device_devt, 0, - HMM_DEVICE_MAX, - "hmm_device"); - if (ret) - return ret; - - hmm_device_class = class_create(THIS_MODULE, "hmm_device"); - if (IS_ERR(hmm_device_class)) { - unregister_chrdev_region(hmm_device_devt, HMM_DEVICE_MAX); - return PTR_ERR(hmm_device_class); - } - return 0; -} - -device_initcall(hmm_init); #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */ |