ide-ioctls.c revision 97100fc816badbbc162644cfde7ad39ae9211fb4
1/* 2 * IDE ioctls handling. 3 */ 4 5#include <linux/hdreg.h> 6#include <linux/ide.h> 7 8static const struct ide_ioctl_devset ide_ioctl_settings[] = { 9{ HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit }, 10{ HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings }, 11{ HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq }, 12{ HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma }, 13{ -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode }, 14{ 0 } 15}; 16 17int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev, 18 unsigned int cmd, unsigned long arg, 19 const struct ide_ioctl_devset *s) 20{ 21 const struct ide_devset *ds; 22 unsigned long flags; 23 int err = -EOPNOTSUPP; 24 25 for (; (ds = s->setting); s++) { 26 if (ds->get && s->get_ioctl == cmd) 27 goto read_val; 28 else if (ds->set && s->set_ioctl == cmd) 29 goto set_val; 30 } 31 32 return err; 33 34read_val: 35 mutex_lock(&ide_setting_mtx); 36 spin_lock_irqsave(&ide_lock, flags); 37 err = ds->get(drive); 38 spin_unlock_irqrestore(&ide_lock, flags); 39 mutex_unlock(&ide_setting_mtx); 40 return err >= 0 ? put_user(err, (long __user *)arg) : err; 41 42set_val: 43 if (bdev != bdev->bd_contains) 44 err = -EINVAL; 45 else { 46 if (!capable(CAP_SYS_ADMIN)) 47 err = -EACCES; 48 else { 49 mutex_lock(&ide_setting_mtx); 50 err = ide_devset_execute(drive, ds, arg); 51 mutex_unlock(&ide_setting_mtx); 52 } 53 } 54 return err; 55} 56EXPORT_SYMBOL_GPL(ide_setting_ioctl); 57 58static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd, 59 unsigned long arg) 60{ 61 u16 *id = NULL; 62 int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142; 63 int rc = 0; 64 65 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) { 66 rc = -ENOMSG; 67 goto out; 68 } 69 70 id = kmalloc(size, GFP_KERNEL); 71 if (id == NULL) { 72 rc = -ENOMEM; 73 goto out; 74 } 75 76 memcpy(id, drive->id, size); 77 ata_id_to_hd_driveid(id); 78 79 if (copy_to_user((void __user *)arg, id, size)) 80 rc = -EFAULT; 81 82 kfree(id); 83out: 84 return rc; 85} 86 87static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg) 88{ 89 return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) 90 << IDE_NICE_DSC_OVERLAP) | 91 (!!(drive->dev_flags & IDE_DFLAG_NICE1) 92 << IDE_NICE_1), (long __user *)arg); 93} 94 95static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg) 96{ 97 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 98 return -EPERM; 99 100 if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) && 101 (drive->media == ide_disk || drive->media == ide_floppy || 102 (drive->dev_flags & IDE_DFLAG_SCSI))) 103 return -EPERM; 104 105 if ((arg >> IDE_NICE_DSC_OVERLAP) & 1) 106 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 107 else 108 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 109 110 if ((arg >> IDE_NICE_1) & 1) 111 drive->dev_flags |= IDE_DFLAG_NICE1; 112 else 113 drive->dev_flags &= ~IDE_DFLAG_NICE1; 114 115 return 0; 116} 117 118static int ide_cmd_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg) 119{ 120 u8 *buf = NULL; 121 int bufsize = 0, err = 0; 122 u8 args[4], xfer_rate = 0; 123 ide_task_t tfargs; 124 struct ide_taskfile *tf = &tfargs.tf; 125 u16 *id = drive->id; 126 127 if (NULL == (void *) arg) { 128 struct request *rq; 129 130 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 131 rq->cmd_type = REQ_TYPE_ATA_TASKFILE; 132 err = blk_execute_rq(drive->queue, NULL, rq, 0); 133 blk_put_request(rq); 134 135 return err; 136 } 137 138 if (copy_from_user(args, (void __user *)arg, 4)) 139 return -EFAULT; 140 141 memset(&tfargs, 0, sizeof(ide_task_t)); 142 tf->feature = args[2]; 143 if (args[0] == ATA_CMD_SMART) { 144 tf->nsect = args[3]; 145 tf->lbal = args[1]; 146 tf->lbam = 0x4f; 147 tf->lbah = 0xc2; 148 tfargs.tf_flags = IDE_TFLAG_OUT_TF | IDE_TFLAG_IN_NSECT; 149 } else { 150 tf->nsect = args[1]; 151 tfargs.tf_flags = IDE_TFLAG_OUT_FEATURE | 152 IDE_TFLAG_OUT_NSECT | IDE_TFLAG_IN_NSECT; 153 } 154 tf->command = args[0]; 155 tfargs.data_phase = args[3] ? TASKFILE_IN : TASKFILE_NO_DATA; 156 157 if (args[3]) { 158 tfargs.tf_flags |= IDE_TFLAG_IO_16BIT; 159 bufsize = SECTOR_SIZE * args[3]; 160 buf = kzalloc(bufsize, GFP_KERNEL); 161 if (buf == NULL) 162 return -ENOMEM; 163 } 164 165 if (tf->command == ATA_CMD_SET_FEATURES && 166 tf->feature == SETFEATURES_XFER && 167 tf->nsect >= XFER_SW_DMA_0 && 168 (id[ATA_ID_UDMA_MODES] || 169 id[ATA_ID_MWDMA_MODES] || 170 id[ATA_ID_SWDMA_MODES])) { 171 xfer_rate = args[1]; 172 if (tf->nsect > XFER_UDMA_2 && !eighty_ninty_three(drive)) { 173 printk(KERN_WARNING "%s: UDMA speeds >UDMA33 cannot " 174 "be set\n", drive->name); 175 goto abort; 176 } 177 } 178 179 err = ide_raw_taskfile(drive, &tfargs, buf, args[3]); 180 181 args[0] = tf->status; 182 args[1] = tf->error; 183 args[2] = tf->nsect; 184 185 if (!err && xfer_rate) { 186 /* active-retuning-calls future */ 187 ide_set_xfer_rate(drive, xfer_rate); 188 ide_driveid_update(drive); 189 } 190abort: 191 if (copy_to_user((void __user *)arg, &args, 4)) 192 err = -EFAULT; 193 if (buf) { 194 if (copy_to_user((void __user *)(arg + 4), buf, bufsize)) 195 err = -EFAULT; 196 kfree(buf); 197 } 198 return err; 199} 200 201static int ide_task_ioctl(ide_drive_t *drive, unsigned cmd, unsigned long arg) 202{ 203 void __user *p = (void __user *)arg; 204 int err = 0; 205 u8 args[7]; 206 ide_task_t task; 207 208 if (copy_from_user(args, p, 7)) 209 return -EFAULT; 210 211 memset(&task, 0, sizeof(task)); 212 memcpy(&task.tf_array[7], &args[1], 6); 213 task.tf.command = args[0]; 214 task.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE; 215 216 err = ide_no_data_taskfile(drive, &task); 217 218 args[0] = task.tf.command; 219 memcpy(&args[1], &task.tf_array[7], 6); 220 221 if (copy_to_user(p, args, 7)) 222 err = -EFAULT; 223 224 return err; 225} 226 227static int generic_drive_reset(ide_drive_t *drive) 228{ 229 struct request *rq; 230 int ret = 0; 231 232 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 233 rq->cmd_type = REQ_TYPE_SPECIAL; 234 rq->cmd_len = 1; 235 rq->cmd[0] = REQ_DRIVE_RESET; 236 rq->cmd_flags |= REQ_SOFTBARRIER; 237 if (blk_execute_rq(drive->queue, NULL, rq, 1)) 238 ret = rq->errors; 239 blk_put_request(rq); 240 return ret; 241} 242 243int generic_ide_ioctl(ide_drive_t *drive, struct file *file, 244 struct block_device *bdev, 245 unsigned int cmd, unsigned long arg) 246{ 247 int err; 248 249 err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings); 250 if (err != -EOPNOTSUPP) 251 return err; 252 253 switch (cmd) { 254 case HDIO_OBSOLETE_IDENTITY: 255 case HDIO_GET_IDENTITY: 256 if (bdev != bdev->bd_contains) 257 return -EINVAL; 258 return ide_get_identity_ioctl(drive, cmd, arg); 259 case HDIO_GET_NICE: 260 return ide_get_nice_ioctl(drive, arg); 261 case HDIO_SET_NICE: 262 if (!capable(CAP_SYS_ADMIN)) 263 return -EACCES; 264 return ide_set_nice_ioctl(drive, arg); 265#ifdef CONFIG_IDE_TASK_IOCTL 266 case HDIO_DRIVE_TASKFILE: 267 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 268 return -EACCES; 269 if (drive->media == ide_disk) 270 return ide_taskfile_ioctl(drive, cmd, arg); 271 return -ENOMSG; 272#endif 273 case HDIO_DRIVE_CMD: 274 if (!capable(CAP_SYS_RAWIO)) 275 return -EACCES; 276 return ide_cmd_ioctl(drive, cmd, arg); 277 case HDIO_DRIVE_TASK: 278 if (!capable(CAP_SYS_RAWIO)) 279 return -EACCES; 280 return ide_task_ioctl(drive, cmd, arg); 281 case HDIO_DRIVE_RESET: 282 if (!capable(CAP_SYS_ADMIN)) 283 return -EACCES; 284 return generic_drive_reset(drive); 285 case HDIO_GET_BUSSTATE: 286 if (!capable(CAP_SYS_ADMIN)) 287 return -EACCES; 288 if (put_user(BUSSTATE_ON, (long __user *)arg)) 289 return -EFAULT; 290 return 0; 291 case HDIO_SET_BUSSTATE: 292 if (!capable(CAP_SYS_ADMIN)) 293 return -EACCES; 294 return -EOPNOTSUPP; 295 default: 296 return -EINVAL; 297 } 298} 299EXPORT_SYMBOL(generic_ide_ioctl); 300