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         scsi_req_init(rq);
  23         ide_req(rq)->type = ATA_PRIV_PM_SUSPEND;
  24         rq->special = &rqpm;
  25         rqpm.pm_step = IDE_PM_START_SUSPEND;
  26         if (mesg.event == PM_EVENT_PRETHAW)
  27                 mesg.event = PM_EVENT_FREEZE;
  28         rqpm.pm_state = mesg.event;
  29
  30         blk_execute_rq(drive->queue, NULL, rq, 0);
  31         ret = scsi_req(rq)->result ? -EIO : 0;
  32         blk_put_request(rq);
  33
  34         if (ret == 0 && ide_port_acpi(hwif)) {
  35                 /* call ACPI _PS3 only after both devices are suspended */
  36                 if ((drive->dn & 1) || pair == NULL)
  37                         ide_acpi_set_state(hwif, 0);
  38         }
  39
  40         return ret;
  41 }
  42
  43 static void ide_end_sync_rq(struct request *rq, blk_status_t error)
  44 {
  45         complete(rq->end_io_data);
  46 }
  47
  48 static int ide_pm_execute_rq(struct request *rq)
  49 {
  50         struct request_queue *q = rq->q;
  51         DECLARE_COMPLETION_ONSTACK(wait);
  52
  53         rq->end_io_data = &wait;
  54         rq->end_io = ide_end_sync_rq;
  55
  56         spin_lock_irq(q->queue_lock);
  57         if (unlikely(blk_queue_dying(q))) {
  58                 rq->rq_flags |= RQF_QUIET;
  59                 scsi_req(rq)->result = -ENXIO;
  60                 __blk_end_request_all(rq, BLK_STS_OK);
  61                 spin_unlock_irq(q->queue_lock);
  62                 return -ENXIO;
  63         }
  64         __elv_add_request(q, rq, ELEVATOR_INSERT_FRONT);
  65         __blk_run_queue_uncond(q);
  66         spin_unlock_irq(q->queue_lock);
  67
  68         wait_for_completion_io(&wait);
  69
  70         return scsi_req(rq)->result ? -EIO : 0;
  71 }
  72
  73 int generic_ide_resume(struct device *dev)
  74 {
  75         ide_drive_t *drive = to_ide_device(dev);
  76         ide_drive_t *pair = ide_get_pair_dev(drive);
  77         ide_hwif_t *hwif = drive->hwif;
  78         struct request *rq;
  79         struct ide_pm_state rqpm;
  80         int err;
  81
  82         if (ide_port_acpi(hwif)) {
  83                 /* call ACPI _PS0 / _STM only once */
  84                 if ((drive->dn & 1) == 0 || pair == NULL) {
  85                         ide_acpi_set_state(hwif, 1);
  86                         ide_acpi_push_timing(hwif);
  87                 }
  88
  89                 ide_acpi_exec_tfs(drive);
  90         }
  91
  92         memset(&rqpm, 0, sizeof(rqpm));
  93         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM);
  94         scsi_req_init(rq);
  95         ide_req(rq)->type = ATA_PRIV_PM_RESUME;
  96         rq->rq_flags |= RQF_PREEMPT;
  97         rq->special = &rqpm;
  98         rqpm.pm_step = IDE_PM_START_RESUME;
  99         rqpm.pm_state = PM_EVENT_ON;
 100
 101         err = ide_pm_execute_rq(rq);
 102         blk_put_request(rq);
 103
 104         if (err == 0 && dev->driver) {
 105                 struct ide_driver *drv = to_ide_driver(dev->driver);
 106
 107                 if (drv->resume)
 108                         drv->resume(drive);
 109         }
 110
 111         return err;
 112 }
 113
 114 void ide_complete_power_step(ide_drive_t *drive, struct request *rq)
 115 {
 116         struct ide_pm_state *pm = rq->special;
 117
 118 #ifdef DEBUG_PM
 119         printk(KERN_INFO "%s: complete_power_step(step: %d)\n",
 120                 drive->name, pm->pm_step);
 121 #endif
 122         if (drive->media != ide_disk)
 123                 return;
 124
 125         switch (pm->pm_step) {
 126         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 127                 if (pm->pm_state == PM_EVENT_FREEZE)
 128                         pm->pm_step = IDE_PM_COMPLETED;
 129                 else
 130                         pm->pm_step = IDE_PM_STANDBY;
 131                 break;
 132         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 133                 pm->pm_step = IDE_PM_COMPLETED;
 134                 break;
 135         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 136                 pm->pm_step = IDE_PM_IDLE;
 137                 break;
 138         case IDE_PM_IDLE:               /* Resume step 2 (idle)*/
 139                 pm->pm_step = IDE_PM_RESTORE_DMA;
 140                 break;
 141         }
 142 }
 143
 144 ide_startstop_t ide_start_power_step(ide_drive_t *drive, struct request *rq)
 145 {
 146         struct ide_pm_state *pm = rq->special;
 147         struct ide_cmd cmd = { };
 148
 149         switch (pm->pm_step) {
 150         case IDE_PM_FLUSH_CACHE:        /* Suspend step 1 (flush cache) */
 151                 if (drive->media != ide_disk)
 152                         break;
 153                 /* Not supported? Switch to next step now. */
 154                 if (ata_id_flush_enabled(drive->id) == 0 ||
 155                     (drive->dev_flags & IDE_DFLAG_WCACHE) == 0) {
 156                         ide_complete_power_step(drive, rq);
 157                         return ide_stopped;
 158                 }
 159                 if (ata_id_flush_ext_enabled(drive->id))
 160                         cmd.tf.command = ATA_CMD_FLUSH_EXT;
 161                 else
 162                         cmd.tf.command = ATA_CMD_FLUSH;
 163                 goto out_do_tf;
 164         case IDE_PM_STANDBY:            /* Suspend step 2 (standby) */
 165                 cmd.tf.command = ATA_CMD_STANDBYNOW1;
 166                 goto out_do_tf;
 167         case IDE_PM_RESTORE_PIO:        /* Resume step 1 (restore PIO) */
 168                 ide_set_max_pio(drive);
 169                 /*
 170                  * skip IDE_PM_IDLE for ATAPI devices
 171                  */
 172                 if (drive->media != ide_disk)
 173                         pm->pm_step = IDE_PM_RESTORE_DMA;
 174                 else
 175                         ide_complete_power_step(drive, rq);
 176                 return ide_stopped;
 177         case IDE_PM_IDLE:               /* Resume step 2 (idle) */
 178                 cmd.tf.command = ATA_CMD_IDLEIMMEDIATE;
 179                 goto out_do_tf;
 180         case IDE_PM_RESTORE_DMA:        /* Resume step 3 (restore DMA) */
 181                 /*
 182                  * Right now, all we do is call ide_set_dma(drive),
 183                  * we could be smarter and check for current xfer_speed
 184                  * in struct drive etc...
 185                  */
 186                 if (drive->hwif->dma_ops == NULL)
 187                         break;
 188                 /*
 189                  * TODO: respect IDE_DFLAG_USING_DMA
 190                  */
 191                 ide_set_dma(drive);
 192                 break;
 193         }
 194
 195         pm->pm_step = IDE_PM_COMPLETED;
 196
 197         return ide_stopped;
 198
 199 out_do_tf:
 200         cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
 201         cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
 202         cmd.protocol = ATA_PROT_NODATA;
 203
 204         return do_rw_taskfile(drive, &cmd);
 205 }
 206
 207 /**
 208  *      ide_complete_pm_rq - end the current Power Management request
 209  *      @drive: target drive
 210  *      @rq: request
 211  *
 212  *      This function cleans up the current PM request and stops the queue
 213  *      if necessary.
 214  */
 215 void ide_complete_pm_rq(ide_drive_t *drive, struct request *rq)
 216 {
 217         struct request_queue *q = drive->queue;
 218         struct ide_pm_state *pm = rq->special;
 219         unsigned long flags;
 220
 221         ide_complete_power_step(drive, rq);
 222         if (pm->pm_step != IDE_PM_COMPLETED)
 223                 return;
 224
 225 #ifdef DEBUG_PM
 226         printk("%s: completing PM request, %s\n", drive->name,
 227                (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND) ? "suspend" : "resume");
 228 #endif
 229         spin_lock_irqsave(q->queue_lock, flags);
 230         if (ide_req(rq)->type == ATA_PRIV_PM_SUSPEND)
 231                 blk_stop_queue(q);
 232         else
 233                 drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
 234         spin_unlock_irqrestore(q->queue_lock, flags);
 235
 236         drive->hwif->rq = NULL;
 237
 238         if (blk_end_request(rq, BLK_STS_OK, 0))
 239                 BUG();
 240 }
 241
 242 void ide_check_pm_state(ide_drive_t *drive, struct request *rq)
 243 {
 244         struct ide_pm_state *pm = rq->special;
 245
 246         if (blk_rq_is_private(rq) &&
 247             ide_req(rq)->type == ATA_PRIV_PM_SUSPEND &&
 248             pm->pm_step == IDE_PM_START_SUSPEND)
 249                 /* Mark drive blocked when starting the suspend sequence. */
 250                 drive->dev_flags |= IDE_DFLAG_BLOCKED;
 251         else if (blk_rq_is_private(rq) &&
 252                  ide_req(rq)->type == ATA_PRIV_PM_RESUME &&
 253                  pm->pm_step == IDE_PM_START_RESUME) {
 254                 /*
 255                  * The first thing we do on wakeup is to wait for BSY bit to
 256                  * go away (with a looong timeout) as a drive on this hwif may
 257                  * just be POSTing itself.
 258                  * We do that before even selecting as the "other" device on
 259                  * the bus may be broken enough to walk on our toes at this
 260                  * point.
 261                  */
 262                 ide_hwif_t *hwif = drive->hwif;
 263                 const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 264                 struct request_queue *q = drive->queue;
 265                 unsigned long flags;
 266                 int rc;
 267 #ifdef DEBUG_PM
 268                 printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name);
 269 #endif
 270                 rc = ide_wait_not_busy(hwif, 35000);
 271                 if (rc)
 272                         printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name);
 273                 tp_ops->dev_select(drive);
 274                 tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 275                 rc = ide_wait_not_busy(hwif, 100000);
 276                 if (rc)
 277                         printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name);
 278
 279                 spin_lock_irqsave(q->queue_lock, flags);
 280                 blk_start_queue(q);
 281                 spin_unlock_irqrestore(q->queue_lock, flags);
 282         }
 283 }