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author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-01-06 17:20:49 +0100 |
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committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2009-01-06 17:20:49 +0100 |
commit | 5b31f855f10d0053e738baa6d91fb6a3fad35119 (patch) | |
tree | bdd8125faf6e4b8baf37d86270389b4d6f62f37d /include | |
parent | efe0397eef544ac4bcca23d39aa8d5db154952e0 (diff) | |
download | linux-5b31f855f10d0053e738baa6d91fb6a3fad35119.tar.gz linux-5b31f855f10d0053e738baa6d91fb6a3fad35119.tar.bz2 linux-5b31f855f10d0053e738baa6d91fb6a3fad35119.zip |
ide: use lock bitops for ports serialization (v2)
* Add ->host_busy field to struct ide_host and use it's first bit
together with lock bitops to provide new ports serialization method.
* Convert core IDE code to use new ide_[un]lock_host() helpers.
This removes the need for taking hwgroup->lock if host is already
busy on serialized hosts and makes it possible to merge ide_hwgroup_t
into ide_hwif_t (done in the later patch).
* Remove no longer needed ide_hwgroup_t.busy and ide_[un]lock_hwgroup().
* Update do_ide_request() documentation.
v2:
* ide_release_lock() should be called inside IDE_HFLAG_SERIALIZE check.
* Add ide_hwif_t.busy flag and ide_[un]lock_port() for serializing
devices on a port.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/ide.h | 35 |
1 files changed, 6 insertions, 29 deletions
diff --git a/include/linux/ide.h b/include/linux/ide.h index 8b74ccdd221c..00df155b5a02 100644 --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -828,6 +828,7 @@ typedef struct hwif_s { unsigned present : 1; /* this interface exists */ unsigned sg_mapped : 1; /* sg_table and sg_nents are ready */ + unsigned busy : 1; /* serializes devices on a port */ struct device gendev; struct device *portdev; @@ -851,8 +852,13 @@ struct ide_host { unsigned long host_flags; void *host_priv; ide_hwif_t *cur_port; /* for hosts requiring serialization */ + + /* used for hosts requiring serialization */ + volatile long host_busy; }; +#define IDE_HOST_BUSY 0 + /* * internal ide interrupt handler type */ @@ -866,8 +872,6 @@ typedef struct hwgroup_s { /* irq handler, if active */ ide_startstop_t (*handler)(ide_drive_t *); - /* BOOL: protects all fields below */ - volatile int busy; /* BOOL: polling active & poll_timeout field valid */ unsigned int polling : 1; @@ -1271,26 +1275,6 @@ extern void ide_stall_queue(ide_drive_t *drive, unsigned long timeout); extern void ide_timer_expiry(unsigned long); extern irqreturn_t ide_intr(int irq, void *dev_id); - -static inline int ide_lock_hwgroup(ide_hwgroup_t *hwgroup, ide_hwif_t *hwif) -{ - if (hwgroup->busy) - return 1; - - hwgroup->busy = 1; - /* for atari only */ - ide_get_lock(ide_intr, hwif); - - return 0; -} - -static inline void ide_unlock_hwgroup(ide_hwgroup_t *hwgroup) -{ - /* for atari only */ - ide_release_lock(); - hwgroup->busy = 0; -} - extern void do_ide_request(struct request_queue *); void ide_init_disk(struct gendisk *, ide_drive_t *); @@ -1617,13 +1601,6 @@ static inline void ide_set_max_pio(ide_drive_t *drive) extern spinlock_t ide_lock; extern struct mutex ide_cfg_mtx; -/* - * Structure locking: - * - * ide_hwgroup_t->busy: hwgroup->lock - * ide_hwif_t->{hwgroup,mate}: constant, no locking - * ide_drive_t->hwif: constant, no locking - */ #define local_irq_set(flags) do { local_save_flags((flags)); local_irq_enable_in_hardirq(); } while (0) |