diff options
Diffstat (limited to 'block/bsg.c')
| -rw-r--r-- | block/bsg.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/block/bsg.c b/block/bsg.c new file mode 100644 index 000000000..2ab1351eb --- /dev/null +++ b/block/bsg.c @@ -0,0 +1,268 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * bsg.c - block layer implementation of the sg v4 interface + */ +#include <linux/module.h> +#include <linux/init.h> +#include <linux/file.h> +#include <linux/blkdev.h> +#include <linux/cdev.h> +#include <linux/jiffies.h> +#include <linux/percpu.h> +#include <linux/idr.h> +#include <linux/bsg.h> +#include <linux/slab.h> + +#include <scsi/scsi.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/sg.h> + +#define BSG_DESCRIPTION "Block layer SCSI generic (bsg) driver" +#define BSG_VERSION "0.4" + +struct bsg_device { + struct request_queue *queue; + struct device device; + struct cdev cdev; + int max_queue; + unsigned int timeout; + unsigned int reserved_size; + bsg_sg_io_fn *sg_io_fn; +}; + +static inline struct bsg_device *to_bsg_device(struct inode *inode) +{ + return container_of(inode->i_cdev, struct bsg_device, cdev); +} + +#define BSG_DEFAULT_CMDS 64 +#define BSG_MAX_DEVS 32768 + +static DEFINE_IDA(bsg_minor_ida); +static struct class *bsg_class; +static int bsg_major; + +static unsigned int bsg_timeout(struct bsg_device *bd, struct sg_io_v4 *hdr) +{ + unsigned int timeout = BLK_DEFAULT_SG_TIMEOUT; + + if (hdr->timeout) + timeout = msecs_to_jiffies(hdr->timeout); + else if (bd->timeout) + timeout = bd->timeout; + + return max_t(unsigned int, timeout, BLK_MIN_SG_TIMEOUT); +} + +static int bsg_sg_io(struct bsg_device *bd, fmode_t mode, void __user *uarg) +{ + struct sg_io_v4 hdr; + int ret; + + if (copy_from_user(&hdr, uarg, sizeof(hdr))) + return -EFAULT; + if (hdr.guard != 'Q') + return -EINVAL; + ret = bd->sg_io_fn(bd->queue, &hdr, mode, bsg_timeout(bd, &hdr)); + if (!ret && copy_to_user(uarg, &hdr, sizeof(hdr))) + return -EFAULT; + return ret; +} + +static int bsg_open(struct inode *inode, struct file *file) +{ + if (!blk_get_queue(to_bsg_device(inode)->queue)) + return -ENXIO; + return 0; +} + +static int bsg_release(struct inode *inode, struct file *file) +{ + blk_put_queue(to_bsg_device(inode)->queue); + return 0; +} + +static int bsg_get_command_q(struct bsg_device *bd, int __user *uarg) +{ + return put_user(READ_ONCE(bd->max_queue), uarg); +} + +static int bsg_set_command_q(struct bsg_device *bd, int __user *uarg) +{ + int max_queue; + + if (get_user(max_queue, uarg)) + return -EFAULT; + if (max_queue < 1) + return -EINVAL; + WRITE_ONCE(bd->max_queue, max_queue); + return 0; +} + +static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct bsg_device *bd = to_bsg_device(file_inode(file)); + struct request_queue *q = bd->queue; + void __user *uarg = (void __user *) arg; + int __user *intp = uarg; + int val; + + switch (cmd) { + /* + * Our own ioctls + */ + case SG_GET_COMMAND_Q: + return bsg_get_command_q(bd, uarg); + case SG_SET_COMMAND_Q: + return bsg_set_command_q(bd, uarg); + + /* + * SCSI/sg ioctls + */ + case SG_GET_VERSION_NUM: + return put_user(30527, intp); + case SCSI_IOCTL_GET_IDLUN: + return put_user(0, intp); + case SCSI_IOCTL_GET_BUS_NUMBER: + return put_user(0, intp); + case SG_SET_TIMEOUT: + if (get_user(val, intp)) + return -EFAULT; + bd->timeout = clock_t_to_jiffies(val); + return 0; + case SG_GET_TIMEOUT: + return jiffies_to_clock_t(bd->timeout); + case SG_GET_RESERVED_SIZE: + return put_user(min(bd->reserved_size, queue_max_bytes(q)), + intp); + case SG_SET_RESERVED_SIZE: + if (get_user(val, intp)) + return -EFAULT; + if (val < 0) + return -EINVAL; + bd->reserved_size = + min_t(unsigned int, val, queue_max_bytes(q)); + return 0; + case SG_EMULATED_HOST: + return put_user(1, intp); + case SG_IO: + return bsg_sg_io(bd, file->f_mode, uarg); + case SCSI_IOCTL_SEND_COMMAND: + pr_warn_ratelimited("%s: calling unsupported SCSI_IOCTL_SEND_COMMAND\n", + current->comm); + return -EINVAL; + default: + return -ENOTTY; + } +} + +static const struct file_operations bsg_fops = { + .open = bsg_open, + .release = bsg_release, + .unlocked_ioctl = bsg_ioctl, + .compat_ioctl = compat_ptr_ioctl, + .owner = THIS_MODULE, + .llseek = default_llseek, +}; + +static void bsg_device_release(struct device *dev) +{ + struct bsg_device *bd = container_of(dev, struct bsg_device, device); + + ida_free(&bsg_minor_ida, MINOR(bd->device.devt)); + kfree(bd); +} + +void bsg_unregister_queue(struct bsg_device *bd) +{ + if (bd->queue->kobj.sd) + sysfs_remove_link(&bd->queue->kobj, "bsg"); + cdev_device_del(&bd->cdev, &bd->device); + put_device(&bd->device); +} +EXPORT_SYMBOL_GPL(bsg_unregister_queue); + +struct bsg_device *bsg_register_queue(struct request_queue *q, + struct device *parent, const char *name, bsg_sg_io_fn *sg_io_fn) +{ + struct bsg_device *bd; + int ret; + + bd = kzalloc(sizeof(*bd), GFP_KERNEL); + if (!bd) + return ERR_PTR(-ENOMEM); + bd->max_queue = BSG_DEFAULT_CMDS; + bd->reserved_size = INT_MAX; + bd->queue = q; + bd->sg_io_fn = sg_io_fn; + + ret = ida_alloc_max(&bsg_minor_ida, BSG_MAX_DEVS - 1, GFP_KERNEL); + if (ret < 0) { + if (ret == -ENOSPC) + dev_err(parent, "bsg: too many bsg devices\n"); + kfree(bd); + return ERR_PTR(ret); + } + bd->device.devt = MKDEV(bsg_major, ret); + bd->device.class = bsg_class; + bd->device.parent = parent; + bd->device.release = bsg_device_release; + dev_set_name(&bd->device, "%s", name); + device_initialize(&bd->device); + + cdev_init(&bd->cdev, &bsg_fops); + bd->cdev.owner = THIS_MODULE; + ret = cdev_device_add(&bd->cdev, &bd->device); + if (ret) + goto out_put_device; + + if (q->kobj.sd) { + ret = sysfs_create_link(&q->kobj, &bd->device.kobj, "bsg"); + if (ret) + goto out_device_del; + } + + return bd; + +out_device_del: + cdev_device_del(&bd->cdev, &bd->device); +out_put_device: + put_device(&bd->device); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(bsg_register_queue); + +static char *bsg_devnode(struct device *dev, umode_t *mode) +{ + return kasprintf(GFP_KERNEL, "bsg/%s", dev_name(dev)); +} + +static int __init bsg_init(void) +{ + dev_t devid; + int ret; + + bsg_class = class_create(THIS_MODULE, "bsg"); + if (IS_ERR(bsg_class)) + return PTR_ERR(bsg_class); + bsg_class->devnode = bsg_devnode; + + ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg"); + if (ret) + goto destroy_bsg_class; + bsg_major = MAJOR(devid); + + printk(KERN_INFO BSG_DESCRIPTION " version " BSG_VERSION + " loaded (major %d)\n", bsg_major); + return 0; + +destroy_bsg_class: + class_destroy(bsg_class); + return ret; +} + +MODULE_AUTHOR("Jens Axboe"); +MODULE_DESCRIPTION(BSG_DESCRIPTION); +MODULE_LICENSE("GPL"); + +device_initcall(bsg_init); |