Re: [PATCH] IDE Power Management, try 3

From: Bartlomiej Zolnierkiewicz (B.Zolnierkiewicz@elka.pw.edu.pl)
Date: Fri Jun 06 2003 - 16:25:23 EST


I have corrected it a bit and I am going to submit it, any comments?

Ben, can you verify my changes and check that it still works after 'fixing'?
:-)

List of (trivial) changes:
- in generic_ide_resume(): memset() &rqpm, not &args
- don't check for drive->id, it is always present
- in -bk tree __blk_stop_queue() is gone and blk_[start,stop]_queue()
  has to be called with queue lock held, so update ide_complete_pm_request()
- fix ide_wait_not_busy() for stat == 0xff (previously returned -EBUSY)
- export ide_wait_not_busy(), it is used by ide-probe-mod when ide is modular
- readd #ifdef CONFIG_PPC around wait_hwif_ready() for now
- make pm_state u32 (was int) to match ->suspend() and ->resume()
- blk_request_is_pm() -> blk_pm_request() to match blkdev.h naming scheme
- add blk_pm_suspend_request() and blk_pm_resume_request() macros
- coding style and whitespace fixups

Incremental patch:
http://home.elka.pw.edu.pl/~bzolnier/ide-pm-3-4.patch

--
Bartlomiej

IDE Power Management

Patch by Benjamin Herrenschmidt, minor fixes by me.

drivers/ide/ide-cd.c | 45 +++++++++++++++++++ drivers/ide/ide-disk.c | 112 ++++++++++++++++++++++++++++-------------------- drivers/ide/ide-io.c | 110 +++++++++++++++++++++++++++++++++++++++++++++-- drivers/ide/ide-iops.c | 28 ++++++++++++ drivers/ide/ide-probe.c | 36 +-------------- drivers/ide/ide.c | 48 ++++++++++++++++++++ include/linux/blkdev.h | 33 ++++++++++++++ include/linux/ide.h | 41 +++++++++++++++++ 8 files changed, 372 insertions(+), 81 deletions(-)

diff -puN drivers/ide/ide.c~ide-pm-4 drivers/ide/ide.c --- linux-2.5.70-bk11/drivers/ide/ide.c~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/drivers/ide/ide.c Fri Jun 6 22:12:42 2003 @@ -1441,6 +1441,54 @@ int ata_attach(ide_drive_t *drive) EXPORT_SYMBOL(ata_attach); +int generic_ide_suspend(struct device *dev, u32 state, u32 level) +{ + ide_drive_t *drive = dev->driver_data; + struct request rq; + struct request_pm_state rqpm; + ide_task_t args; + + if (level == dev->power_state || level != SUSPEND_SAVE_STATE) + return 0; + + memset(&rq, 0, sizeof(rq)); + memset(&rqpm, 0, sizeof(rqpm)); + memset(&args, 0, sizeof(args)); + rq.flags = REQ_PM_SUSPEND; + rq.special = &args; + rq.pm = &rqpm; + rqpm.pm_step = ide_pm_state_start_suspend; + rqpm.pm_state = state; + + return ide_do_drive_cmd(drive, &rq, ide_wait); +} + +EXPORT_SYMBOL(generic_ide_suspend); + +int generic_ide_resume(struct device *dev, u32 level) +{ + ide_drive_t *drive = dev->driver_data; + struct request rq; + struct request_pm_state rqpm; + ide_task_t args; + + if (level == dev->power_state || level != RESUME_RESTORE_STATE) + return 0; + + memset(&rq, 0, sizeof(rq)); + memset(&rqpm, 0, sizeof(rqpm)); + memset(&args, 0, sizeof(args)); + rq.flags = REQ_PM_RESUME; + rq.special = &args; + rq.pm = &rqpm; + rqpm.pm_step = ide_pm_state_start_resume; + rqpm.pm_state = 0; + + return ide_do_drive_cmd(drive, &rq, ide_head_wait); +} + +EXPORT_SYMBOL(generic_ide_resume); + int generic_ide_ioctl(struct block_device *bdev, unsigned int cmd, unsigned long arg) { diff -puN drivers/ide/ide-cd.c~ide-pm-4 drivers/ide/ide-cd.c --- linux-2.5.70-bk11/drivers/ide/ide-cd.c~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/drivers/ide/ide-cd.c Fri Jun 6 22:18:01 2003 @@ -3253,6 +3253,45 @@ int ide_cdrom_cleanup(ide_drive_t *drive static int ide_cdrom_attach (ide_drive_t *drive); +/* + * Power Management state machine. + * + * We don't do much for CDs right now. + */ + +static void ide_cdrom_complete_power_step (ide_drive_t *drive, struct request *rq, u8 stat, u8 error) +{ +} + +static ide_startstop_t ide_cdrom_start_power_step (ide_drive_t *drive, struct request *rq) +{ + ide_task_t *args = rq->special; + + memset(args, 0, sizeof(*args)); + + switch (rq->pm->pm_step) { + case ide_pm_state_start_suspend: + break; + + case ide_pm_state_start_resume: /* Resume step 1 (restore DMA) */ + /* + * Right now, all we do is call hwif->ide_dma_check(drive), + * we could be smarter and check for current xfer_speed + * in struct drive etc... + * Also, this step could be implemented as a generic helper + * as most subdrivers will use it. + */ + if ((drive->id->capability & 1) == 0) + break; + if (HWIF(drive)->ide_dma_check == NULL) + break; + HWIF(drive)->ide_dma_check(drive); + break; + } + rq->pm->pm_step = ide_pm_state_completed; + return ide_stopped; +} + static ide_driver_t ide_cdrom_driver = { .owner = THIS_MODULE, .name = "ide-cdrom", @@ -3269,6 +3308,12 @@ static ide_driver_t ide_cdrom_driver = { .capacity = ide_cdrom_capacity, .attach = ide_cdrom_attach, .drives = LIST_HEAD_INIT(ide_cdrom_driver.drives), + .start_power_step = ide_cdrom_start_power_step, + .complete_power_step = ide_cdrom_complete_power_step, + .gen_driver = { + .suspend = generic_ide_suspend, + .resume = generic_ide_resume, + } }; static int idecd_open(struct inode * inode, struct file * file) diff -puN drivers/ide/ide-disk.c~ide-pm-4 drivers/ide/ide-disk.c --- linux-2.5.70-bk11/drivers/ide/ide-disk.c~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/drivers/ide/ide-disk.c Fri Jun 6 22:18:23 2003 @@ -138,8 +138,6 @@ static int idedisk_start_tag(ide_drive_t #ifndef CONFIG_IDE_TASKFILE_IO -static int driver_blocked; - /* * read_intr() is the handler for disk read/multread interrupts */ @@ -364,9 +362,6 @@ ide_startstop_t __ide_do_rw_disk (ide_dr nsectors.all = (u16) rq->nr_sectors; - if (driver_blocked) - panic("Request while ide driver is blocked?"); - if (drive->using_tcq && idedisk_start_tag(drive, rq)) { if (!ata_pending_commands(drive)) BUG(); @@ -1392,21 +1387,6 @@ static int write_cache (ide_drive_t *dri return 0; } -static int call_idedisk_standby (ide_drive_t *drive, int arg) -{ - ide_task_t args; - u8 standby = (arg) ? WIN_STANDBYNOW2 : WIN_STANDBYNOW1; - memset(&args, 0, sizeof(ide_task_t)); - args.tfRegister[IDE_COMMAND_OFFSET] = standby; - args.command_type = ide_cmd_type_parser(&args); - return ide_raw_taskfile(drive, &args, NULL); -} - -static int do_idedisk_standby (ide_drive_t *drive) -{ - return call_idedisk_standby(drive, 0); -} - static int do_idedisk_flushcache (ide_drive_t *drive) { ide_task_t args; @@ -1505,37 +1485,75 @@ static void idedisk_add_settings(ide_dri #endif } -static int idedisk_suspend(struct device *dev, u32 state, u32 level) -{ - ide_drive_t *drive = dev->driver_data; - - printk("Suspending device %p\n", dev->driver_data); - - /* I hope that every freeze operation from the upper levels have - * already been done... - */ +/* + * Power Management state machine. This one is rather trivial for now, + * we should probably add more, like switching back to PIO on suspend + * to help some BIOSes, re-do the door locking on resume, etc... + */ - if (level != SUSPEND_SAVE_STATE) - return 0; +enum { + idedisk_pm_flush_cache = ide_pm_state_start_suspend, + idedisk_pm_standby, - /* set the drive to standby */ - printk(KERN_INFO "suspending: %s ", drive->name); - do_idedisk_standby(drive); - drive->blocked = 1; + idedisk_pm_restore_dma = ide_pm_state_start_resume, +}; - BUG_ON (HWGROUP(drive)->handler); - return 0; +static void idedisk_complete_power_step (ide_drive_t *drive, struct request *rq, u8 stat, u8 error) +{ + switch (rq->pm->pm_step) { + case idedisk_pm_flush_cache: /* Suspend step 1 (flush cache) complete */ + if (rq->pm->pm_state == 4) + rq->pm->pm_step = ide_pm_state_completed; + else + rq->pm->pm_step = idedisk_pm_standby; + break; + case idedisk_pm_standby: /* Suspend step 2 (standby) complete */ + rq->pm->pm_step = ide_pm_state_completed; + break; + } } -static int idedisk_resume(struct device *dev, u32 level) +static ide_startstop_t idedisk_start_power_step (ide_drive_t *drive, struct request *rq) { - ide_drive_t *drive = dev->driver_data; + ide_task_t *args = rq->special; - if (level != RESUME_RESTORE_STATE) - return 0; - BUG_ON(!drive->blocked); - drive->blocked = 0; - return 0; + memset(args, 0, sizeof(*args)); + + switch (rq->pm->pm_step) { + case idedisk_pm_flush_cache: /* Suspend step 1 (flush cache) */ + /* Not supported? Switch to next step now. */ + if (!drive->wcache) { + idedisk_complete_power_step(drive, rq, 0, 0); + return ide_stopped; + } + if (drive->id->cfs_enable_2 & 0x2400) + args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE_EXT; + else + args->tfRegister[IDE_COMMAND_OFFSET] = WIN_FLUSH_CACHE; + args->command_type = ide_cmd_type_parser(args); + return do_rw_taskfile(drive, args); + case idedisk_pm_standby: /* Suspend step 2 (standby) */ + args->tfRegister[IDE_COMMAND_OFFSET] = WIN_STANDBYNOW1; + args->command_type = ide_cmd_type_parser(args); + return do_rw_taskfile(drive, args); + + case idedisk_pm_restore_dma: /* Resume step 1 (restore DMA) */ + /* + * Right now, all we do is call hwif->ide_dma_check(drive), + * we could be smarter and check for current xfer_speed + * in struct drive etc... + * Also, this step could be implemented as a generic helper + * as most subdrivers will use it + */ + if ((drive->id->capability & 1) == 0) + break; + if (HWIF(drive)->ide_dma_check == NULL) + break; + HWIF(drive)->ide_dma_check(drive); + break; + } + rq->pm->pm_step = ide_pm_state_completed; + return ide_stopped; } static void idedisk_setup (ide_drive_t *drive) @@ -1681,9 +1699,11 @@ static ide_driver_t idedisk_driver = { .proc = idedisk_proc, .attach = idedisk_attach, .drives = LIST_HEAD_INIT(idedisk_driver.drives), + .start_power_step = idedisk_start_power_step, + .complete_power_step = idedisk_complete_power_step, .gen_driver = { - .suspend = idedisk_suspend, - .resume = idedisk_resume, + .suspend = generic_ide_suspend, + .resume = generic_ide_resume, } }; diff -puN drivers/ide/ide-io.c~ide-pm-4 drivers/ide/ide-io.c --- linux-2.5.70-bk11/drivers/ide/ide-io.c~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/drivers/ide/ide-io.c Fri Jun 6 22:11:10 2003 @@ -139,6 +139,35 @@ int ide_end_request (ide_drive_t *drive, EXPORT_SYMBOL(ide_end_request); /** + * ide_complete_pm_request - end the current Power Management request + * @drive: target drive + * @rq: request + * + * This function cleans up the current PM request and stops the queue + * if necessary. + */ +static void ide_complete_pm_request (ide_drive_t *drive, struct request *rq) +{ + unsigned long flags; + +#ifdef DEBUG_PM + printk("%s: completing PM request, %s\n", drive->name, + blk_pm_suspend_request(rq) ? "suspend" : "resume"); +#endif + spin_lock_irqsave(&ide_lock, flags); + if (blk_pm_suspend_request(rq)) { + blk_stop_queue(&drive->queue); + } else { + drive->blocked = 0; + blk_start_queue(&drive->queue); + } + blkdev_dequeue_request(rq); + HWGROUP(drive)->rq = NULL; + end_that_request_last(rq); + spin_unlock_irqrestore(&ide_lock, flags); +} + +/** * ide_end_drive_cmd - end an explicit drive command * @drive: command * @stat: status bits @@ -214,6 +243,15 @@ void ide_end_drive_cmd (ide_drive_t *dri args->hobRegister[IDE_HCYL_OFFSET_HOB] = hwif->INB(IDE_HCYL_REG); } } + } else if (blk_pm_request(rq)) { +#ifdef DEBUG_PM + printk("%s: complete_power_step(step: %d, stat: %x, err: %x)\n", + drive->name, rq->pm->pm_step, stat, err); +#endif + DRIVER(drive)->complete_power_step(drive, rq, stat, err); + if (rq->pm->pm_step == ide_pm_state_completed) + ide_complete_pm_request(drive, rq); + return; } spin_lock_irqsave(&ide_lock, flags); @@ -615,6 +653,34 @@ ide_startstop_t start_request (ide_drive while ((read_timer() - HWIF(drive)->last_time) < DISK_RECOVERY_TIME); #endif + if (blk_pm_suspend_request(rq) && + rq->pm->pm_step == ide_pm_state_start_suspend) + /* Mark drive blocked when starting the suspend sequence. */ + drive->blocked = 1; + else if (blk_pm_resume_request(rq) && + rq->pm->pm_step == ide_pm_state_start_resume) { + /* + * The first thing we do on wakeup is to wait for BSY bit to + * go away (with a looong timeout) as a drive on this hwif may + * just be POSTing itself. + * We do that before even selecting as the "other" device on + * the bus may be broken enough to walk on our toes at this + * point. + */ + int rc; +#ifdef DEBUG_PM + printk("%s: Wakeup request inited, waiting for !BSY...\n", drive->name); +#endif + rc = ide_wait_not_busy(HWIF(drive), 35000); + if (rc) + printk(KERN_WARNING "%s: bus not ready on wakeup\n", drive->name); + SELECT_DRIVE(drive); + HWIF(drive)->OUTB(8, HWIF(drive)->io_ports[IDE_CONTROL_OFFSET]); + rc = ide_wait_not_busy(HWIF(drive), 10000); + if (rc) + printk(KERN_WARNING "%s: drive not ready on wakeup\n", drive->name); + } + SELECT_DRIVE(drive); if (ide_wait_stat(&startstop, drive, drive->ready_stat, BUSY_STAT|DRQ_STAT, WAIT_READY)) { printk(KERN_ERR "%s: drive not ready for command\n", drive->name); @@ -625,6 +691,17 @@ ide_startstop_t start_request (ide_drive return execute_drive_cmd(drive, rq); else if (rq->flags & REQ_DRIVE_TASKFILE) return execute_drive_cmd(drive, rq); + else if (blk_pm_request(rq)) { +#ifdef DEBUG_PM + printk("%s: start_power_step(step: %d)\n", + drive->name, rq->pm->pm_step); +#endif + startstop = DRIVER(drive)->start_power_step(drive, rq); + if (startstop == ide_stopped && + rq->pm->pm_step == ide_pm_state_completed) + ide_complete_pm_request(drive, rq); + return startstop; + } return (DRIVER(drive)->do_request(drive, rq, block)); } return do_special(drive); @@ -837,6 +914,28 @@ queue_next: break; } + /* + * Sanity: don't accept a request that isn't a PM request + * if we are currently power managed. This is very important as + * blk_stop_queue() doesn't prevent the elv_next_request() + * above to return us whatever is in the queue. Since we call + * ide_do_request() ourselves, we end up taking requests while + * the queue is blocked... + * + * We let requests forced at head of queue with ide-preempt + * though. I hope that doesn't happen too much, hopefully not + * unless the subdriver triggers such a thing in it's own PM + * state machine. + */ + if (drive->blocked && !blk_pm_request(rq) && !(rq->flags & REQ_PREEMPT)) { +#ifdef DEBUG_PM + printk("%s: a request made it's way while we are power managing...\n", drive->name); +#endif + /* We clear busy, there should be no pending ATA command at this point. */ + hwgroup->busy = 0; + break; + } + if (!rq->bio && ata_pending_commands(drive)) break; @@ -1282,12 +1381,16 @@ int ide_do_drive_cmd (ide_drive_t *drive ide_hwgroup_t *hwgroup = HWGROUP(drive); DECLARE_COMPLETION(wait); int insert_end = 1, err; + int must_wait = (action == ide_wait || action == ide_head_wait); #ifdef CONFIG_BLK_DEV_PDC4030 /* * FIXME: there should be a drive or hwif->special * handler that points here by default, not hacks * in the ide-io.c code + * + * FIXME2: That code breaks power management if used with + * this chipset, that really doesn't belong here ! */ if (HWIF(drive)->chipset == ide_pdc4030 && rq->buffer != NULL) return -ENOSYS; /* special drive cmds not supported */ @@ -1301,22 +1404,23 @@ int ide_do_drive_cmd (ide_drive_t *drive * we need to hold an extra reference to request for safe inspection * after completion */ - if (action == ide_wait) { + if (must_wait) { rq->ref_count++; rq->waiting = &wait; } spin_lock_irqsave(&ide_lock, flags); - if (action == ide_preempt) { + if (action == ide_preempt || action == ide_head_wait) { hwgroup->rq = NULL; insert_end = 0; + rq->flags |= REQ_PREEMPT; } __elv_add_request(&drive->queue, rq, insert_end, 0); ide_do_request(hwgroup, IDE_NO_IRQ); spin_unlock_irqrestore(&ide_lock, flags); err = 0; - if (action == ide_wait) { + if (must_wait) { wait_for_completion(&wait); if (rq->errors) err = -EIO; diff -puN drivers/ide/ide-iops.c~ide-pm-4 drivers/ide/ide-iops.c --- linux-2.5.70-bk11/drivers/ide/ide-iops.c~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/drivers/ide/ide-iops.c Fri Jun 6 19:28:30 2003 @@ -1320,3 +1320,31 @@ ide_startstop_t ide_do_reset (ide_drive_ EXPORT_SYMBOL(ide_do_reset); +/* + * ide_wait_not_busy() waits for the currently selected device on the hwif + * to report a non-busy status, see comments in probe_hwif(). + */ +int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) +{ + u8 stat = 0; + + while(timeout--) { + /* + * Turn this into a schedule() sleep once I'm sure + * about locking issues (2.5 work ?). + */ + mdelay(1); + stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); + /* + * Assume a value of 0xff means nothing is connected to + * the interface and it doesn't implement the pull-down + * resistor on D7. + */ + if ((stat & BUSY_STAT) == 0 || stat == 0xff) + return 0; + } + return -EBUSY; +} + +EXPORT_SYMBOL_GPL(ide_wait_not_busy); + diff -puN drivers/ide/ide-probe.c~ide-pm-4 drivers/ide/ide-probe.c --- linux-2.5.70-bk11/drivers/ide/ide-probe.c~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/drivers/ide/ide-probe.c Fri Jun 6 19:29:07 2003 @@ -723,35 +723,7 @@ static void hwif_register (ide_hwif_t *h //EXPORT_SYMBOL(hwif_register); -/* Enable code below on all archs later, for now, I want it on PPC - */ #ifdef CONFIG_PPC -/* - * This function waits for the hwif to report a non-busy status - * see comments in probe_hwif() - */ -static int wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) -{ - u8 stat = 0; - - while(timeout--) { - /* Turn this into a schedule() sleep once I'm sure - * about locking issues (2.5 work ?) - */ - mdelay(1); - stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); - if ((stat & BUSY_STAT) == 0) - break; - /* Assume a value of 0xff means nothing is connected to - * the interface and it doesn't implement the pull-down - * resistor on D7 - */ - if (stat == 0xff) - break; - } - return ((stat & BUSY_STAT) == 0) ? 0 : -EBUSY; -} - static int wait_hwif_ready(ide_hwif_t *hwif) { int rc; @@ -766,7 +738,7 @@ static int wait_hwif_ready(ide_hwif_t *h * I know of at least one disk who takes 31 seconds, I use 35 * here to be safe */ - rc = wait_not_busy(hwif, 35000); + rc = ide_wait_not_busy(hwif, 35000); if (rc) return rc; @@ -774,20 +746,20 @@ static int wait_hwif_ready(ide_hwif_t *h SELECT_DRIVE(&hwif->drives[0]); hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); mdelay(2); - rc = wait_not_busy(hwif, 10000); + rc = ide_wait_not_busy(hwif, 10000); if (rc) return rc; SELECT_DRIVE(&hwif->drives[1]); hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); mdelay(2); - rc = wait_not_busy(hwif, 10000); + rc = ide_wait_not_busy(hwif, 10000); /* Exit function with master reselected (let's be sane) */ SELECT_DRIVE(&hwif->drives[0]); return rc; } -#endif /* CONFIG_PPC */ +#endif /* * This routine only knows how to look for drive units 0 and 1 diff -puN include/linux/blkdev.h~ide-pm-4 include/linux/blkdev.h --- linux-2.5.70-bk11/include/linux/blkdev.h~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/include/linux/blkdev.h Fri Jun 6 23:09:44 2003 @@ -19,6 +19,7 @@ struct request_queue; typedef struct request_queue request_queue_t; struct elevator_s; typedef struct elevator_s elevator_t; +struct request_pm_state; #define BLKDEV_MIN_RQ 4 #define BLKDEV_MAX_RQ 128 @@ -102,6 +103,11 @@ struct request { void *sense; unsigned int timeout; + + /* + * For Power Management requests + */ + struct request_pm_state *pm; }; /* @@ -130,6 +136,10 @@ enum rq_flag_bits { __REQ_DRIVE_CMD, __REQ_DRIVE_TASK, __REQ_DRIVE_TASKFILE, + __REQ_PREEMPT, /* set for "ide_preempt" requests */ + __REQ_PM_SUSPEND, /* suspend request */ + __REQ_PM_RESUME, /* resume request */ + __REQ_PM_SHUTDOWN, /* shutdown request */ __REQ_NR_BITS, /* stops here */ }; @@ -151,6 +161,23 @@ enum rq_flag_bits { #define REQ_DRIVE_CMD (1 << __REQ_DRIVE_CMD) #define REQ_DRIVE_TASK (1 << __REQ_DRIVE_TASK) #define REQ_DRIVE_TASKFILE (1 << __REQ_DRIVE_TASKFILE) +#define REQ_PREEMPT (1 << __REQ_PREEMPT) +#define REQ_PM_SUSPEND (1 << __REQ_PM_SUSPEND) +#define REQ_PM_RESUME (1 << __REQ_PM_RESUME) +#define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN) + +/* + * State information carried for REQ_PM_SUSPEND and REQ_PM_RESUME + * requests. Some step values could eventually be made generic. + */ +struct request_pm_state +{ + /* PM state machine step value, currently driver specific */ + int pm_step; + /* requested PM state value (S1, S2, S3, S4, ...) */ + u32 pm_state; + void* data; /* for driver use */ +}; #include <linux/elevator.h> @@ -277,6 +304,12 @@ struct request_queue #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) #define blk_fs_request(rq) ((rq)->flags & REQ_CMD) #define blk_pc_request(rq) ((rq)->flags & REQ_BLOCK_PC) + +#define blk_pm_suspend_request(rq) ((rq)->flags & REQ_PM_SUSPEND) +#define blk_pm_resume_request(rq) ((rq)->flags & REQ_PM_RESUME) +#define blk_pm_request(rq) \ + ((rq)->flags & (REQ_PM_SUSPEND | REQ_PM_RESUME)) + #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) #define rq_data_dir(rq) ((rq)->flags & 1) diff -puN include/linux/ide.h~ide-pm-4 include/linux/ide.h --- linux-2.5.70-bk11/include/linux/ide.h~ide-pm-4 Fri Jun 6 18:46:53 2003 +++ linux-2.5.70-bk11-root/include/linux/ide.h Fri Jun 6 23:21:06 2003 @@ -23,6 +23,8 @@ #include <asm/hdreg.h> #include <asm/io.h> +#define DEBUG_PM + /* * This is the multiple IDE interface driver, as evolved from hd.c. * It supports up to four IDE interfaces, on one or more IRQs (usually 14 & 15). @@ -1143,6 +1145,39 @@ read_proc_t proc_ide_read_geometry; #endif /* + * Power Management step value (rq->pm->pm_step). + * + * The step value starts at 0 (ide_pm_state_start_suspend) for a + * suspend operation or 1000 (ide_pm_state_start_resume) for a + * resume operation. + * + * For each step, the core calls the subdriver start_power_step() first. + * This can return: + * - ide_stopped : In this case, the core calls us back again unless + * step have been set to ide_power_state_completed. + * - ide_started : In this case, the channel is left busy until an + * async event (interrupt) occurs. + * Typically, start_power_step() will issue a taskfile request with + * do_rw_taskfile(). + * + * Upon reception of the interrupt, the core will call complete_power_step() + * with the error code if any. This routine should update the step value + * and return. It should not start a new request. The core will call + * start_power_step for the new step value, unless step have been set to + * ide_power_state_completed. + * + * Subdrivers are expected to define their own additional power + * steps from 1..999 for suspend and from 1001..1999 for resume, + * other values are reserved for future use. + */ + +enum { + ide_pm_state_completed = -1, + ide_pm_state_start_suspend = 0, + ide_pm_state_start_resume = 1000, +}; + +/* * Subdrivers support. */ #define IDE_SUBDRIVER_VERSION 1 @@ -1171,6 +1206,8 @@ typedef struct ide_driver_s { int (*attach)(ide_drive_t *); void (*ata_prebuilder)(ide_drive_t *); void (*atapi_prebuilder)(ide_drive_t *); + ide_startstop_t (*start_power_step)(ide_drive_t *, struct request *); + void (*complete_power_step)(ide_drive_t *, struct request *, u8, u8); struct device_driver gen_driver; struct list_head drives; struct list_head drivers; @@ -1179,6 +1216,8 @@ typedef struct ide_driver_s { #define DRIVER(drive) ((drive)->driver) extern int generic_ide_ioctl(struct block_device *, unsigned, unsigned long); +extern int generic_ide_suspend(struct device *dev, u32 state, u32 level); +extern int generic_ide_resume(struct device *dev, u32 level); /* * IDE modules. @@ -1320,6 +1359,7 @@ typedef enum { ide_wait, /* insert rq at end of list, and wait for it */ ide_next, /* insert rq immediately after current request */ ide_preempt, /* insert rq in front of current request */ + ide_head_wait, /* insert rq in front of current request and wait for it */ ide_end /* insert rq at end of list, but don't wait for it */ } ide_action_t; @@ -1530,6 +1570,7 @@ extern u8 eighty_ninty_three (ide_drive_ extern int set_transfer(ide_drive_t *, ide_task_t *); extern int taskfile_lib_get_identify(ide_drive_t *drive, u8 *); +extern int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout); ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block); /*

_

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sat Jun 07 2003 - 22:00:31 EST