linux/drivers/ide/ide-ioctls.c
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   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 block_device *bdev,
 244                      unsigned int cmd, unsigned long arg)
 245{
 246        int err;
 247
 248        err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
 249        if (err != -EOPNOTSUPP)
 250                return err;
 251
 252        switch (cmd) {
 253        case HDIO_OBSOLETE_IDENTITY:
 254        case HDIO_GET_IDENTITY:
 255                if (bdev != bdev->bd_contains)
 256                        return -EINVAL;
 257                return ide_get_identity_ioctl(drive, cmd, arg);
 258        case HDIO_GET_NICE:
 259                return ide_get_nice_ioctl(drive, arg);
 260        case HDIO_SET_NICE:
 261                if (!capable(CAP_SYS_ADMIN))
 262                        return -EACCES;
 263                return ide_set_nice_ioctl(drive, arg);
 264#ifdef CONFIG_IDE_TASK_IOCTL
 265        case HDIO_DRIVE_TASKFILE:
 266                if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
 267                        return -EACCES;
 268                if (drive->media == ide_disk)
 269                        return ide_taskfile_ioctl(drive, cmd, arg);
 270                return -ENOMSG;
 271#endif
 272        case HDIO_DRIVE_CMD:
 273                if (!capable(CAP_SYS_RAWIO))
 274                        return -EACCES;
 275                return ide_cmd_ioctl(drive, cmd, arg);
 276        case HDIO_DRIVE_TASK:
 277                if (!capable(CAP_SYS_RAWIO))
 278                        return -EACCES;
 279                return ide_task_ioctl(drive, cmd, arg);
 280        case HDIO_DRIVE_RESET:
 281                if (!capable(CAP_SYS_ADMIN))
 282                        return -EACCES;
 283                return generic_drive_reset(drive);
 284        case HDIO_GET_BUSSTATE:
 285                if (!capable(CAP_SYS_ADMIN))
 286                        return -EACCES;
 287                if (put_user(BUSSTATE_ON, (long __user *)arg))
 288                        return -EFAULT;
 289                return 0;
 290        case HDIO_SET_BUSSTATE:
 291                if (!capable(CAP_SYS_ADMIN))
 292                        return -EACCES;
 293                return -EOPNOTSUPP;
 294        default:
 295                return -EINVAL;
 296        }
 297}
 298EXPORT_SYMBOL(generic_ide_ioctl);
 299