1/* 2 * IDE ioctls handling. 3 */ 4 5#include <linux/hdreg.h> 6#include <linux/ide.h> 7#include <linux/slab.h> 8 9static const struct ide_ioctl_devset ide_ioctl_settings[] = { 10{ HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit }, 11{ HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings }, 12{ HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq }, 13{ HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma }, 14{ -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode }, 15{ 0 } 16}; 17 18int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev, 19 unsigned int cmd, unsigned long arg, 20 const struct ide_ioctl_devset *s) 21{ 22 const struct ide_devset *ds; 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 err = ds->get(drive); 37 mutex_unlock(&ide_setting_mtx); 38 return err >= 0 ? put_user(err, (long __user *)arg) : err; 39 40set_val: 41 if (bdev != bdev->bd_contains) 42 err = -EINVAL; 43 else { 44 if (!capable(CAP_SYS_ADMIN)) 45 err = -EACCES; 46 else { 47 mutex_lock(&ide_setting_mtx); 48 err = ide_devset_execute(drive, ds, arg); 49 mutex_unlock(&ide_setting_mtx); 50 } 51 } 52 return err; 53} 54EXPORT_SYMBOL_GPL(ide_setting_ioctl); 55 56static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd, 57 unsigned long arg) 58{ 59 u16 *id = NULL; 60 int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142; 61 int rc = 0; 62 63 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) { 64 rc = -ENOMSG; 65 goto out; 66 } 67 68 /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */ 69 id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL); 70 if (id == NULL) { 71 rc = -ENOMEM; 72 goto out; 73 } 74 75 memcpy(id, drive->id, size); 76 ata_id_to_hd_driveid(id); 77 78 if (copy_to_user((void __user *)arg, id, size)) 79 rc = -EFAULT; 80 81 kfree(id); 82out: 83 return rc; 84} 85 86static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg) 87{ 88 return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP) 89 << IDE_NICE_DSC_OVERLAP) | 90 (!!(drive->dev_flags & IDE_DFLAG_NICE1) 91 << IDE_NICE_1), (long __user *)arg); 92} 93 94static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg) 95{ 96 if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1)))) 97 return -EPERM; 98 99 if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) && 100 (drive->media != ide_tape)) 101 return -EPERM; 102 103 if ((arg >> IDE_NICE_DSC_OVERLAP) & 1) 104 drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP; 105 else 106 drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP; 107 108 if ((arg >> IDE_NICE_1) & 1) 109 drive->dev_flags |= IDE_DFLAG_NICE1; 110 else 111 drive->dev_flags &= ~IDE_DFLAG_NICE1; 112 113 return 0; 114} 115 116static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg) 117{ 118 u8 *buf = NULL; 119 int bufsize = 0, err = 0; 120 u8 args[4], xfer_rate = 0; 121 struct ide_cmd cmd; 122 struct ide_taskfile *tf = &cmd.tf; 123 124 if (NULL == (void *) arg) { 125 struct request *rq; 126 127 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 128 rq->cmd_type = REQ_TYPE_ATA_TASKFILE; 129 err = blk_execute_rq(drive->queue, NULL, rq, 0); 130 blk_put_request(rq); 131 132 return err; 133 } 134 135 if (copy_from_user(args, (void __user *)arg, 4)) 136 return -EFAULT; 137 138 memset(&cmd, 0, sizeof(cmd)); 139 tf->feature = args[2]; 140 if (args[0] == ATA_CMD_SMART) { 141 tf->nsect = args[3]; 142 tf->lbal = args[1]; 143 tf->lbam = 0x4f; 144 tf->lbah = 0xc2; 145 cmd.valid.out.tf = IDE_VALID_OUT_TF; 146 cmd.valid.in.tf = IDE_VALID_NSECT; 147 } else { 148 tf->nsect = args[1]; 149 cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT; 150 cmd.valid.in.tf = IDE_VALID_NSECT; 151 } 152 tf->command = args[0]; 153 cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA; 154 155 if (args[3]) { 156 cmd.tf_flags |= IDE_TFLAG_IO_16BIT; 157 bufsize = SECTOR_SIZE * args[3]; 158 buf = kzalloc(bufsize, GFP_KERNEL); 159 if (buf == NULL) 160 return -ENOMEM; 161 } 162 163 if (tf->command == ATA_CMD_SET_FEATURES && 164 tf->feature == SETFEATURES_XFER && 165 tf->nsect >= XFER_SW_DMA_0) { 166 xfer_rate = ide_find_dma_mode(drive, tf->nsect); 167 if (xfer_rate != tf->nsect) { 168 err = -EINVAL; 169 goto abort; 170 } 171 172 cmd.tf_flags |= IDE_TFLAG_SET_XFER; 173 } 174 175 err = ide_raw_taskfile(drive, &cmd, buf, args[3]); 176 177 args[0] = tf->status; 178 args[1] = tf->error; 179 args[2] = tf->nsect; 180abort: 181 if (copy_to_user((void __user *)arg, &args, 4)) 182 err = -EFAULT; 183 if (buf) { 184 if (copy_to_user((void __user *)(arg + 4), buf, bufsize)) 185 err = -EFAULT; 186 kfree(buf); 187 } 188 return err; 189} 190 191static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg) 192{ 193 void __user *p = (void __user *)arg; 194 int err = 0; 195 u8 args[7]; 196 struct ide_cmd cmd; 197 198 if (copy_from_user(args, p, 7)) 199 return -EFAULT; 200 201 memset(&cmd, 0, sizeof(cmd)); 202 memcpy(&cmd.tf.feature, &args[1], 6); 203 cmd.tf.command = args[0]; 204 cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE; 205 cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE; 206 207 err = ide_no_data_taskfile(drive, &cmd); 208 209 args[0] = cmd.tf.command; 210 memcpy(&args[1], &cmd.tf.feature, 6); 211 212 if (copy_to_user(p, args, 7)) 213 err = -EFAULT; 214 215 return err; 216} 217 218static int generic_drive_reset(ide_drive_t *drive) 219{ 220 struct request *rq; 221 int ret = 0; 222 223 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 224 rq->cmd_type = REQ_TYPE_SPECIAL; 225 rq->cmd_len = 1; 226 rq->cmd[0] = REQ_DRIVE_RESET; 227 if (blk_execute_rq(drive->queue, NULL, rq, 1)) 228 ret = rq->errors; 229 blk_put_request(rq); 230 return ret; 231} 232 233int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev, 234 unsigned int cmd, unsigned long arg) 235{ 236 int err; 237 238 err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings); 239 if (err != -EOPNOTSUPP) 240 return err; 241 242 switch (cmd) { 243 case HDIO_OBSOLETE_IDENTITY: 244 case HDIO_GET_IDENTITY: 245 if (bdev != bdev->bd_contains) 246 return -EINVAL; 247 return ide_get_identity_ioctl(drive, cmd, arg); 248 case HDIO_GET_NICE: 249 return ide_get_nice_ioctl(drive, arg); 250 case HDIO_SET_NICE: 251 if (!capable(CAP_SYS_ADMIN)) 252 return -EACCES; 253 return ide_set_nice_ioctl(drive, arg); 254#ifdef CONFIG_IDE_TASK_IOCTL 255 case HDIO_DRIVE_TASKFILE: 256 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 257 return -EACCES; 258 if (drive->media == ide_disk) 259 return ide_taskfile_ioctl(drive, arg); 260 return -ENOMSG; 261#endif 262 case HDIO_DRIVE_CMD: 263 if (!capable(CAP_SYS_RAWIO)) 264 return -EACCES; 265 return ide_cmd_ioctl(drive, arg); 266 case HDIO_DRIVE_TASK: 267 if (!capable(CAP_SYS_RAWIO)) 268 return -EACCES; 269 return ide_task_ioctl(drive, arg); 270 case HDIO_DRIVE_RESET: 271 if (!capable(CAP_SYS_ADMIN)) 272 return -EACCES; 273 return generic_drive_reset(drive); 274 case HDIO_GET_BUSSTATE: 275 if (!capable(CAP_SYS_ADMIN)) 276 return -EACCES; 277 if (put_user(BUSSTATE_ON, (long __user *)arg)) 278 return -EFAULT; 279 return 0; 280 case HDIO_SET_BUSSTATE: 281 if (!capable(CAP_SYS_ADMIN)) 282 return -EACCES; 283 return -EOPNOTSUPP; 284 default: 285 return -EINVAL; 286 } 287} 288EXPORT_SYMBOL(generic_ide_ioctl); 289