drivers/ide/ide-pm.c

   1 #include <linux/kernel.h>
   2 #include <linux/gfp.h>
   3 #include <linux/ide.h>
   4
   5 int generic_ide_suspend(struct device *dev, pm_message_t mesg)
   6 {
   7         ide_drive_t *drive = to_ide_device(dev);
   8         ide_drive_t *pair = ide_get_pair_dev(drive);
   9         ide_hwif_t *hwif = drive->hwif;
  10         struct request *rq;
  11         struct ide_pm_state rqpm;
  12         int ret;
  13
  14         if (ide_port_acpi(hwif)) {
  15                 /* call ACPI _GTM only once */
  16                 if ((drive->dn & 1) == 0 || pair == NULL)
  17                         ide_acpi_get_timing(hwif);
  18         }
  19
  20         memset(&rqpm, 0, sizeof(rqpm));
  21         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
  22         ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
  23         rq->special = &rqpm;
  24         rqpm.pm_step = IDE_PM_START_SUSPEND;
  25         if (mesg.event == PM_EVENT_PRETHAW)
  26                 mesg.event = PM_EVENT_FREEZE;
  27         rqpm.pm_state = mesg.event;
  28
  29         blk_execute_rq(drive->queue, NULL, rq, 0);
  30         ret = scsi_req(rq)->result ? -EIO : 0;
  31         blk_put_request(rq);
  32
  33         if (ret == 0 && ide_port_acpi(hwif)) {
  34                 /* call ACPI _PS3 only after both devices are suspended */
  35                 if ((drive->dn & 1) || pair == NULL)
  36                         ide_acpi_set_state(hwif, 0);
  37         }
  38
  39         return ret;
  40 }
  41
  42 static void ide_end_sync_rq(struct request *rq, blk_status_t error)
  43 {
  44         complete(rq->end_io_data);
  45 }
  46
  47 static int ide_pm_execute_rq(struct request *rq)
  48 {
  49         struct request_queue *q = rq->q;
  50         DECLARE_COMPLETION_ONSTACK(wait);
  51
  52         rq->end_io_data = &wait;
  53         rq->end_io = ide_end_sync_rq;
  54
  55         spin_lock_irq(q->queue_lock);
  56         if (unlikely(blk_queue_dying(q))) {
  57                 rq->rq_flags |= RQF_QUIET;
  58                 scsi_req(rq)->result = -ENXIO;
  59                 __blk_end_request_all(rq, BLK_STS_OK);
  60                 spin_unlock_irq(q->queue_lock);
  61                 return -ENXIO;
  62         }
  63         __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
  64         __blk_run_queue_uncond(q);
  65         spin_unlock_irq(q->queue_lock);
  66
  67         wait_for_completion_io(&wait);
  68
  69         return scsi_req(rq)->result ? -EIO : 0;
  70 }
  71
  72 int generic_ide_resume(struct device *dev)
  73 {
  74         ide_drive_t *drive = to_ide_device(dev);
  75         ide_drive_t *pair = ide_get_pair_dev(drive);
  76         ide_hwif_t *hwif = drive->hwif;
  77         struct request *rq;
  78         struct ide_pm_state rqpm;
  79         int err;
  80
  81         if (ide_port_acpi(hwif)) {
  82                 /* call ACPI _PS0 / _STM only once */
  83                 if ((drive->dn & 1) == 0 || pair == NULL) {
  84                         ide_acpi_set_state(hwif, 1);
  85                         ide_acpi_push_timing(hwif);
  86                 }
  87
  88                 ide_acpi_exec_tfs(drive);
  89         }
  90
  91         memset(&rqpm, 0, sizeof(rqpm));
  92         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
  93         ide_req(rq)->type = ATA_PRIV_PM_RESUME;
  94         rq->rq_flags |= RQF_PREEMPT;
  95         rq->special = &rqpm;
  96         rqpm.pm_step = IDE_PM_START_RESUME;
  97         rqpm.pm_state = PM_EVENT_ON;
  98
  99         err = ide_pm_execute_rq(rq);
 100         blk_put_request(rq);
 101
 102         if (err == 0 && dev->driver) {
 103                 struct ide_driver *drv = to_ide_driver(dev->driver);
 104
 105                 if (drv->resume)
 106                         drv->resume(drive);
 107         }
 108
 109         return err;
 110 }
 111
 112 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
 113 {
 114         struct ide_pm_state *pm = rq->special;
 115
 116 #ifdef DEBUG_PM
 117         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
 118                 drive->name, pm->pm_step);
 119 #endif
 120         if (drive->media != ide_disk)
 121                 return;
 122
 123         switch (pm->pm_step) {
 124         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 125                 if (pm->pm_state == PM_EVENT_FREEZE)
 126                         pm->pm_step = IDE_PM_COMPLETED;
 127                 else
 128                         pm->pm_step = IDE_PM_STANDBY;
 129                 break;
 130         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 131                 pm->pm_step = IDE_PM_COMPLETED;
 132                 break;
 133         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 134                 pm->pm_step = IDE_PM_IDLE;
 135                 break;
 136         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 137                 pm->pm_step = IDE_PM_RESTORE_DMA;
 138                 break;
 139         }
 140 }
 141
 142 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 143 {
 144         struct ide_pm_state *pm = rq->special;
 145         struct ide_cmd cmd = { };
 146
 147         switch (pm->pm_step) {
 148         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 149                 if (drive->media != ide_disk)
 150                         break;
 151                 /* Not supported? Switch to next step now. */
 152                 if (ata_id_flush_enabled(drive->id) == 0 ||
 153                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 154                         ide_complete_power_step(drive, rq);
 155                         return ide_stopped;
 156                 }
 157                 if (ata_id_flush_ext_enabled(drive->id))
 158                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
 159                 else
 160                         cmd.tf.command = ATA_CMD_FLUSH;
 161                 goto out_do_tf;
 162         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 163                 cmd.tf.command = ATA_CMD_STANDBYNOW1;
 164                 goto out_do_tf;
 165         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 166                 ide_set_max_pio(drive);
 167                 /*
 168                  * skip IDE_PM_IDLE for ATAPI devices
 169                  */
 170                 if (drive->media != ide_disk)
 171                         pm->pm_step = IDE_PM_RESTORE_DMA;
 172                 else
 173                         ide_complete_power_step(drive, rq);
 174                 return ide_stopped;
 175         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 176                 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
 177                 goto out_do_tf;
 178         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 179                 /*
 180                  * Right now, all we do is call ide_set_dma(drive),
 181                  * we could be smarter and check for current xfer_speed
 182                  * in struct drive etc...
 183                  */
 184                 if (drive->hwif->dma_ops == NULL)
 185                         break;
 186                 /*
 187                  * TODO: respect IDE_DFLAG_USING_DMA
 188                  */
 189                 ide_set_dma(drive);
 190                 break;
 191         }
 192
 193         pm->pm_step = IDE_PM_COMPLETED;
 194
 195         return ide_stopped;
 196
 197 out_do_tf:
 198         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 199         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 200         cmd.protocol = ATA_PROT_NODATA;
 201
 202         return do_rw_taskfile(drive, &cmd);
 203 }
 204
 205 /**
 206  *      ide_complete_pm_rq - end the current Power Management request
 207  *      @drive: target drive
 208  *      @rq: request
 209  *
 210  *      This function cleans up the current PM request and stops the queue
 211  *      if necessary.
 212  */
 213 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 214 {
 215         struct request_queue *q = drive->queue;
 216         struct ide_pm_state *pm = rq->special;
 217         unsigned long flags;
 218
 219         ide_complete_power_step(drive, rq);
 220         if (pm->pm_step != IDE_PM_COMPLETED)
 221                 return;
 222
 223 #ifdef DEBUG_PM
 224         printk("%s: completing PM request, %s\n", drive->name,
 225                (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
 226 #endif
 227         spin_lock_irqsave(q->queue_lock, flags);
 228         if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
 229                 blk_stop_queue(q);
 230         else
 231                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 232         spin_unlock_irqrestore(q->queue_lock, flags);
 233
 234         drive->hwif->rq = NULL;
 235
 236         if (blk_end_request(rq, BLK_STS_OK, 0))
 237                 BUG();
 238 }
 239
 240 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 241 {
 242         struct ide_pm_state *pm = rq->special;
 243
 244         if (blk_rq_is_private(rq) &&
 245             ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
 246             pm->pm_step == IDE_PM_START_SUSPEND)
 247                 /* Mark drive blocked when starting the suspend sequence. */
 248                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 249         else if (blk_rq_is_private(rq) &&
 250                  ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
 251                  pm->pm_step == IDE_PM_START_RESUME) {
 252                 /*
 253                  * The first thing we do on wakeup is to wait for BSY bit to
 254                  * go away (with a looong timeout) as a drive on this hwif may
 255                  * just be POSTing itself.
 256                  * We do that before even selecting as the "other" device on
 257                  * the bus may be broken enough to walk on our toes at this
 258                  * point.
 259                  */
 260                 ide_hwif_t *hwif = drive->hwif;
 261                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 262                 struct request_queue *q = drive->queue;
 263                 unsigned long flags;
 264                 int rc;
 265 #ifdef DEBUG_PM
 266                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 267 #endif
 268                 rc = ide_wait_not_busy(hwif, 35000);
 269                 if (rc)
 270                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 271                 tp_ops->dev_select(drive);
 272                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 273                 rc = ide_wait_not_busy(hwif, 100000);
 274                 if (rc)
 275                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 276
 277                 spin_lock_irqsave(q->queue_lock, flags);
 278                 blk_start_queue(q);
 279                 spin_unlock_irqrestore(q->queue_lock, flags);
 280         }
 281 }