LXR linux/drivers/ide/ide-devsets.c

   1
   2#include <linux/kernel.h>
   3#include <linux/gfp.h>
   4#include <linux/ide.h>
   5
   6DEFINE_MUTEX(ide_setting_mtx);
   7
   8ide_devset_get(io_32bit, io_32bit);
   9
  10static int set_io_32bit(ide_drive_t *drive, int arg)
  11{
  12        if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
  13                return -EPERM;
  14
  15        if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
  16                return -EINVAL;
  17
  18        drive->io_32bit = arg;
  19
  20        return 0;
  21}
  22
  23ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
  24
  25static int set_ksettings(ide_drive_t *drive, int arg)
  26{
  27        if (arg < 0 || arg > 1)
  28                return -EINVAL;
  29
  30        if (arg)
  31                drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
  32        else
  33                drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
  34
  35        return 0;
  36}
  37
  38ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
  39
  40static int set_using_dma(ide_drive_t *drive, int arg)
  41{
  42#ifdef CONFIG_BLK_DEV_IDEDMA
  43        int err = -EPERM;
  44
  45        if (arg < 0 || arg > 1)
  46                return -EINVAL;
  47
  48        if (ata_id_has_dma(drive->id) == 0)
  49                goto out;
  50
  51        if (drive->hwif->dma_ops == NULL)
  52                goto out;
  53
  54        err = 0;
  55
  56        if (arg) {
  57                if (ide_set_dma(drive))
  58                        err = -EIO;
  59        } else
  60                ide_dma_off(drive);
  61
  62out:
  63        return err;
  64#else
  65        if (arg < 0 || arg > 1)
  66                return -EINVAL;
  67
  68        return -EPERM;
  69#endif
  70}
  71
  72/*
  73 * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
  74 */
  75static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
  76{
  77        switch (req_pio) {
  78        case 202:
  79        case 201:
  80        case 200:
  81        case 102:
  82        case 101:
  83        case 100:
  84                return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
  85        case 9:
  86        case 8:
  87                return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
  88        case 7:
  89        case 6:
  90                return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
  91        default:
  92                return 0;
  93        }
  94}
  95
  96static int set_pio_mode(ide_drive_t *drive, int arg)
  97{
  98        ide_hwif_t *hwif = drive->hwif;
  99        const struct ide_port_ops *port_ops = hwif->port_ops;
 100
 101        if (arg < 0 || arg > 255)
 102                return -EINVAL;
 103
 104        if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
 105            (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
 106                return -ENOSYS;
 107
 108        if (set_pio_mode_abuse(drive->hwif, arg)) {
 109                drive->pio_mode = arg + XFER_PIO_0;
 110
 111                if (arg == 8 || arg == 9) {
 112                        unsigned long flags;
 113
 114                        /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
 115                        spin_lock_irqsave(&hwif->lock, flags);
 116                        port_ops->set_pio_mode(hwif, drive);
 117                        spin_unlock_irqrestore(&hwif->lock, flags);
 118                } else
 119                        port_ops->set_pio_mode(hwif, drive);
 120        } else {
 121                int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
 122
 123                ide_set_pio(drive, arg);
 124
 125                if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
 126                        if (keep_dma)
 127                                ide_dma_on(drive);
 128                }
 129        }
 130
 131        return 0;
 132}
 133
 134ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
 135
 136static int set_unmaskirq(ide_drive_t *drive, int arg)
 137{
 138        if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
 139                return -EPERM;
 140
 141        if (arg < 0 || arg > 1)
 142                return -EINVAL;
 143
 144        if (arg)
 145                drive->dev_flags |= IDE_DFLAG_UNMASK;
 146        else
 147                drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 148
 149        return 0;
 150}
 151
 152ide_ext_devset_rw_sync(io_32bit, io_32bit);
 153ide_ext_devset_rw_sync(keepsettings, ksettings);
 154ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
 155ide_ext_devset_rw_sync(using_dma, using_dma);
 156__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
 157
 158int ide_devset_execute(ide_drive_t *drive, const struct ide_devset *setting,
 159                       int arg)
 160{
 161        struct request_queue *q = drive->queue;
 162        struct request *rq;
 163        int ret = 0;
 164
 165        if (!(setting->flags & DS_SYNC))
 166                return setting->set(drive, arg);
 167
 168        rq = blk_get_request(q, READ, __GFP_WAIT);
 169        rq->cmd_type = REQ_TYPE_SPECIAL;
 170        rq->cmd_len = 5;
 171        rq->cmd[0] = REQ_DEVSET_EXEC;
 172        *(int *)&rq->cmd[1] = arg;
 173        rq->special = setting->set;
 174
 175        if (blk_execute_rq(q, NULL, rq, 0))
 176                ret = rq->errors;
 177        blk_put_request(rq);
 178
 179        return ret;
 180}
 181
 182ide_startstop_t ide_do_devset(ide_drive_t *drive, struct request *rq)
 183{
 184        int err, (*setfunc)(ide_drive_t *, int) = rq->special;
 185
 186        err = setfunc(drive, *(int *)&rq->cmd[1]);
 187        if (err)
 188                rq->errors = err;
 189        ide_complete_rq(drive, err, blk_rq_bytes(rq));
 190        return ide_stopped;
 191}
 192