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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/ide/ide-ioctls.c
Initial import
Diffstat (limited to 'drivers/ide/ide-ioctls.c')
-rw-r--r--drivers/ide/ide-ioctls.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c
new file mode 100644
index 000000000..6233fa2cb
--- /dev/null
+++ b/drivers/ide/ide-ioctls.c
@@ -0,0 +1,289 @@
+/*
+ * IDE ioctls handling.
+ */
+
+#include <linux/export.h>
+#include <linux/hdreg.h>
+#include <linux/ide.h>
+#include <linux/slab.h>
+
+static const struct ide_ioctl_devset ide_ioctl_settings[] = {
+{ HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit },
+{ HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
+{ HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq },
+{ HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma },
+{ -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode },
+{ 0 }
+};
+
+int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
+ unsigned int cmd, unsigned long arg,
+ const struct ide_ioctl_devset *s)
+{
+ const struct ide_devset *ds;
+ int err = -EOPNOTSUPP;
+
+ for (; (ds = s->setting); s++) {
+ if (ds->get && s->get_ioctl == cmd)
+ goto read_val;
+ else if (ds->set && s->set_ioctl == cmd)
+ goto set_val;
+ }
+
+ return err;
+
+read_val:
+ mutex_lock(&ide_setting_mtx);
+ err = ds->get(drive);
+ mutex_unlock(&ide_setting_mtx);
+ return err >= 0 ? put_user(err, (long __user *)arg) : err;
+
+set_val:
+ if (bdev != bdev->bd_contains)
+ err = -EINVAL;
+ else {
+ if (!capable(CAP_SYS_ADMIN))
+ err = -EACCES;
+ else {
+ mutex_lock(&ide_setting_mtx);
+ err = ide_devset_execute(drive, ds, arg);
+ mutex_unlock(&ide_setting_mtx);
+ }
+ }
+ return err;
+}
+EXPORT_SYMBOL_GPL(ide_setting_ioctl);
+
+static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
+ unsigned long arg)
+{
+ u16 *id = NULL;
+ int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
+ int rc = 0;
+
+ if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
+ rc = -ENOMSG;
+ goto out;
+ }
+
+ /* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */
+ id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
+ if (id == NULL) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ memcpy(id, drive->id, size);
+ ata_id_to_hd_driveid(id);
+
+ if (copy_to_user((void __user *)arg, id, size))
+ rc = -EFAULT;
+
+ kfree(id);
+out:
+ return rc;
+}
+
+static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
+{
+ return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
+ << IDE_NICE_DSC_OVERLAP) |
+ (!!(drive->dev_flags & IDE_DFLAG_NICE1)
+ << IDE_NICE_1), (long __user *)arg);
+}
+
+static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
+{
+ if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
+ return -EPERM;
+
+ if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
+ (drive->media != ide_tape))
+ return -EPERM;
+
+ if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
+ drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
+ else
+ drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
+
+ if ((arg >> IDE_NICE_1) & 1)
+ drive->dev_flags |= IDE_DFLAG_NICE1;
+ else
+ drive->dev_flags &= ~IDE_DFLAG_NICE1;
+
+ return 0;
+}
+
+static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
+{
+ u8 *buf = NULL;
+ int bufsize = 0, err = 0;
+ u8 args[4], xfer_rate = 0;
+ struct ide_cmd cmd;
+ struct ide_taskfile *tf = &cmd.tf;
+
+ if (NULL == (void *) arg) {
+ struct request *rq;
+
+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+ rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
+ err = blk_execute_rq(drive->queue, NULL, rq, 0);
+ blk_put_request(rq);
+
+ return err;
+ }
+
+ if (copy_from_user(args, (void __user *)arg, 4))
+ return -EFAULT;
+
+ memset(&cmd, 0, sizeof(cmd));
+ tf->feature = args[2];
+ if (args[0] == ATA_CMD_SMART) {
+ tf->nsect = args[3];
+ tf->lbal = args[1];
+ tf->lbam = ATA_SMART_LBAM_PASS;
+ tf->lbah = ATA_SMART_LBAH_PASS;
+ cmd.valid.out.tf = IDE_VALID_OUT_TF;
+ cmd.valid.in.tf = IDE_VALID_NSECT;
+ } else {
+ tf->nsect = args[1];
+ cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
+ cmd.valid.in.tf = IDE_VALID_NSECT;
+ }
+ tf->command = args[0];
+ cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
+
+ if (args[3]) {
+ cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
+ bufsize = SECTOR_SIZE * args[3];
+ buf = kzalloc(bufsize, GFP_KERNEL);
+ if (buf == NULL)
+ return -ENOMEM;
+ }
+
+ if (tf->command == ATA_CMD_SET_FEATURES &&
+ tf->feature == SETFEATURES_XFER &&
+ tf->nsect >= XFER_SW_DMA_0) {
+ xfer_rate = ide_find_dma_mode(drive, tf->nsect);
+ if (xfer_rate != tf->nsect) {
+ err = -EINVAL;
+ goto abort;
+ }
+
+ cmd.tf_flags |= IDE_TFLAG_SET_XFER;
+ }
+
+ err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
+
+ args[0] = tf->status;
+ args[1] = tf->error;
+ args[2] = tf->nsect;
+abort:
+ if (copy_to_user((void __user *)arg, &args, 4))
+ err = -EFAULT;
+ if (buf) {
+ if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
+ err = -EFAULT;
+ kfree(buf);
+ }
+ return err;
+}
+
+static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
+{
+ void __user *p = (void __user *)arg;
+ int err = 0;
+ u8 args[7];
+ struct ide_cmd cmd;
+
+ if (copy_from_user(args, p, 7))
+ return -EFAULT;
+
+ memset(&cmd, 0, sizeof(cmd));
+ memcpy(&cmd.tf.feature, &args[1], 6);
+ cmd.tf.command = args[0];
+ cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
+ cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
+
+ err = ide_no_data_taskfile(drive, &cmd);
+
+ args[0] = cmd.tf.command;
+ memcpy(&args[1], &cmd.tf.feature, 6);
+
+ if (copy_to_user(p, args, 7))
+ err = -EFAULT;
+
+ return err;
+}
+
+static int generic_drive_reset(ide_drive_t *drive)
+{
+ struct request *rq;
+ int ret = 0;
+
+ rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
+ rq->cmd_type = REQ_TYPE_SPECIAL;
+ rq->cmd_len = 1;
+ rq->cmd[0] = REQ_DRIVE_RESET;
+ if (blk_execute_rq(drive->queue, NULL, rq, 1))
+ ret = rq->errors;
+ blk_put_request(rq);
+ return ret;
+}
+
+int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
+ unsigned int cmd, unsigned long arg)
+{
+ int err;
+
+ err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
+ if (err != -EOPNOTSUPP)
+ return err;
+
+ switch (cmd) {
+ case HDIO_OBSOLETE_IDENTITY:
+ case HDIO_GET_IDENTITY:
+ if (bdev != bdev->bd_contains)
+ return -EINVAL;
+ return ide_get_identity_ioctl(drive, cmd, arg);
+ case HDIO_GET_NICE:
+ return ide_get_nice_ioctl(drive, arg);
+ case HDIO_SET_NICE:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ return ide_set_nice_ioctl(drive, arg);
+#ifdef CONFIG_IDE_TASK_IOCTL
+ case HDIO_DRIVE_TASKFILE:
+ if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ if (drive->media == ide_disk)
+ return ide_taskfile_ioctl(drive, arg);
+ return -ENOMSG;
+#endif
+ case HDIO_DRIVE_CMD:
+ if (!capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ return ide_cmd_ioctl(drive, arg);
+ case HDIO_DRIVE_TASK:
+ if (!capable(CAP_SYS_RAWIO))
+ return -EACCES;
+ return ide_task_ioctl(drive, arg);
+ case HDIO_DRIVE_RESET:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ return generic_drive_reset(drive);
+ case HDIO_GET_BUSSTATE:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (put_user(BUSSTATE_ON, (long __user *)arg))
+ return -EFAULT;
+ return 0;
+ case HDIO_SET_BUSSTATE:
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ return -EOPNOTSUPP;
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(generic_ide_ioctl);