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libata-sff: port_task is SFF specific

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port_task is tightly bound to the standard SFF PIO HSM implementation.
Using it for any other purpose would be error-prone and there's no
such user and if some drivers need such feature, it would be much
better off using its own.  Move it inside CONFIG_ATA_SFF and rename it
to sff_pio_task.

The only function which is exposed to the core layer is
ata_sff_flush_pio_task() which is renamed from ata_port_flush_task()
and now also takes care of resetting hsm_task_state to HSM_ST_IDLE,
which is possible as it's now specific to PIO HSM.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2010-05-10 21:41:38 +02:00 committed by Jeff Garzik
parent 5fe7454aa9
commit c429137a67
6 changed files with 63 additions and 96 deletions
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69
drivers/ata/libata-core.c
View File

@ -97,7 +97,6 @@ static void ata_dev_xfermask(struct ata_device *dev);
static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
unsigned int ata_print_id = 1;
static struct workqueue_struct *ata_wq;
struct workqueue_struct *ata_aux_wq;
@ -1686,52 +1685,6 @@ unsigned long ata_id_xfermask(const u16 *id)
return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}
/**
* ata_pio_queue_task - Queue port_task
* @ap: The ata_port to queue port_task for
* @data: data for @fn to use
* @delay: delay time in msecs for workqueue function
*
* Schedule @fn(@data) for execution after @delay jiffies using
* port_task. There is one port_task per port and it's the
* user(low level driver)'s responsibility to make sure that only
* one task is active at any given time.
*
* libata core layer takes care of synchronization between
* port_task and EH. ata_pio_queue_task() may be ignored for EH
* synchronization.
*
* LOCKING:
* Inherited from caller.
*/
void ata_pio_queue_task(struct ata_port *ap, void *data, unsigned long delay)
{
ap->port_task_data = data;
/* may fail if ata_port_flush_task() in progress */
queue_delayed_work(ata_wq, &ap->port_task, msecs_to_jiffies(delay));
}
/**
* ata_port_flush_task - Flush port_task
* @ap: The ata_port to flush port_task for
*
* After this function completes, port_task is guranteed not to
* be running or scheduled.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
void ata_port_flush_task(struct ata_port *ap)
{
DPRINTK("ENTER\n");
cancel_rearming_delayed_work(&ap->port_task);
if (ata_msg_ctl(ap))
ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
}
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
{
struct completion *waiting = qc->private_data;
@ -1853,7 +1806,7 @@ unsigned ata_exec_internal_sg(struct ata_device *dev,
rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
ata_port_flush_task(ap);
ata_sff_flush_pio_task(ap);
if (!rc) {
spin_lock_irqsave(ap->lock, flags);
@ -5646,11 +5599,6 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
#endif
#ifdef CONFIG_ATA_SFF
INIT_DELAYED_WORK(&ap->port_task, ata_pio_task);
#else
INIT_DELAYED_WORK(&ap->port_task, NULL);
#endif
INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
INIT_LIST_HEAD(&ap->eh_done_q);
@ -6588,17 +6536,6 @@ static int __init ata_init(void)
ata_parse_force_param();
/*
* FIXME: In UP case, there is only one workqueue thread and if you
* have more than one PIO device, latency is bloody awful, with
* occasional multi-second "hiccups" as one PIO device waits for
* another. It's an ugly wart that users DO occasionally complain
* about; luckily most users have at most one PIO polled device.
*/
ata_wq = create_workqueue("ata");
if (!ata_wq)
goto fail;
ata_aux_wq = create_singlethread_workqueue("ata_aux");
if (!ata_aux_wq)
goto fail;
@ -6612,8 +6549,6 @@ static int __init ata_init(void)
fail:
kfree(ata_force_tbl);
if (ata_wq)
destroy_workqueue(ata_wq);
if (ata_aux_wq)
destroy_workqueue(ata_aux_wq);
return rc;
@ -6623,7 +6558,6 @@ static void __exit ata_exit(void)
{
ata_sff_exit();
kfree(ata_force_tbl);
destroy_workqueue(ata_wq);
destroy_workqueue(ata_aux_wq);
}
@ -6777,7 +6711,6 @@ EXPORT_SYMBOL_GPL(ata_id_c_string);
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
EXPORT_SYMBOL_GPL(ata_scsi_simulate);
EXPORT_SYMBOL_GPL(ata_pio_queue_task);
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
EXPORT_SYMBOL_GPL(ata_timing_compute);

4
drivers/ata/libata-eh.c
View File

@ -550,8 +550,8 @@ void ata_scsi_error(struct Scsi_Host *host)
DPRINTK("ENTER\n");
/* synchronize with port task */
ata_port_flush_task(ap);
/* make sure sff pio task is not running */
ata_sff_flush_pio_task(ap);
/* synchronize with host lock and sort out timeouts */

72
drivers/ata/libata-sff.c
View File

@ -40,6 +40,8 @@
#include "libata.h"
static struct workqueue_struct *ata_sff_wq;
const struct ata_port_operations ata_sff_port_ops = {
.inherits = &ata_base_port_ops,
@ -1293,7 +1295,7 @@ fsm_start:
if (in_wq)
spin_unlock_irqrestore(ap->lock, flags);
/* if polling, ata_pio_task() handles the rest.
/* if polling, ata_sff_pio_task() handles the rest.
* otherwise, interrupt handler takes over from here.
*/
break;
@ -1458,14 +1460,38 @@ fsm_start:
}
EXPORT_SYMBOL_GPL(ata_sff_hsm_move);
void ata_pio_task(struct work_struct *work)
void ata_sff_queue_pio_task(struct ata_port *ap, unsigned long delay)
{
/* may fail if ata_sff_flush_pio_task() in progress */
queue_delayed_work(ata_sff_wq, &ap->sff_pio_task,
msecs_to_jiffies(delay));
}
EXPORT_SYMBOL_GPL(ata_sff_queue_pio_task);
void ata_sff_flush_pio_task(struct ata_port *ap)
{
DPRINTK("ENTER\n");
cancel_rearming_delayed_work(&ap->sff_pio_task);
ap->hsm_task_state = HSM_ST_IDLE;
if (ata_msg_ctl(ap))
ata_port_printk(ap, KERN_DEBUG, "%s: EXIT\n", __func__);
}
static void ata_sff_pio_task(struct work_struct *work)
{
struct ata_port *ap =
container_of(work, struct ata_port, port_task.work);
struct ata_queued_cmd *qc = ap->port_task_data;
container_of(work, struct ata_port, sff_pio_task.work);
struct ata_queued_cmd *qc;
u8 status;
int poll_next;
/* qc can be NULL if timeout occurred */
qc = ata_qc_from_tag(ap, ap->link.active_tag);
if (!qc)
return;
fsm_start:
WARN_ON_ONCE(ap->hsm_task_state == HSM_ST_IDLE);
@ -1481,7 +1507,7 @@ fsm_start:
msleep(2);
status = ata_sff_busy_wait(ap, ATA_BUSY, 10);
if (status & ATA_BUSY) {
ata_pio_queue_task(ap, qc, ATA_SHORT_PAUSE);
ata_sff_queue_pio_task(ap, ATA_SHORT_PAUSE);
return;
}
}
@ -1551,7 +1577,7 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc)
ap->hsm_task_state = HSM_ST_LAST;
if (qc->tf.flags & ATA_TFLAG_POLLING)
ata_pio_queue_task(ap, qc, 0);
ata_sff_queue_pio_task(ap, 0);
break;
@ -1573,20 +1599,21 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc)
if (qc->tf.flags & ATA_TFLAG_WRITE) {
/* PIO data out protocol */
ap->hsm_task_state = HSM_ST_FIRST;
ata_pio_queue_task(ap, qc, 0);
ata_sff_queue_pio_task(ap, 0);
/* always send first data block using
* the ata_pio_task() codepath.
/* always send first data block using the
* ata_sff_pio_task() codepath.
*/
} else {
/* PIO data in protocol */
ap->hsm_task_state = HSM_ST;
if (qc->tf.flags & ATA_TFLAG_POLLING)
ata_pio_queue_task(ap, qc, 0);
ata_sff_queue_pio_task(ap, 0);
/* if polling, ata_pio_task() handles the rest.
* otherwise, interrupt handler takes over from here.
/* if polling, ata_sff_pio_task() handles the
* rest. otherwise, interrupt handler takes
* over from here.
*/
}
@ -1604,7 +1631,7 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc)
/* send cdb by polling if no cdb interrupt */
if ((!(qc->dev->flags & ATA_DFLAG_CDB_INTR)) ||
(qc->tf.flags & ATA_TFLAG_POLLING))
ata_pio_queue_task(ap, qc, 0);
ata_sff_queue_pio_task(ap, 0);
break;
case ATAPI_PROT_DMA:
@ -1616,7 +1643,7 @@ unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc)
/* send cdb by polling if no cdb interrupt */
if (!(qc->dev->flags & ATA_DFLAG_CDB_INTR))
ata_pio_queue_task(ap, qc, 0);
ata_sff_queue_pio_task(ap, 0);
break;
default:
@ -2360,8 +2387,6 @@ void ata_sff_error_handler(struct ata_port *ap)
/* reset PIO HSM and stop DMA engine */
spin_lock_irqsave(ap->lock, flags);
ap->hsm_task_state = HSM_ST_IDLE;
if (ap->ioaddr.bmdma_addr &&
qc && (qc->tf.protocol == ATA_PROT_DMA ||
qc->tf.protocol == ATAPI_PROT_DMA)) {
@ -2432,8 +2457,6 @@ void ata_sff_post_internal_cmd(struct ata_queued_cmd *qc)
spin_lock_irqsave(ap->lock, flags);
ap->hsm_task_state = HSM_ST_IDLE;
if (ap->ioaddr.bmdma_addr)
ap->ops->bmdma_stop(qc);
@ -3074,15 +3097,28 @@ EXPORT_SYMBOL_GPL(ata_pci_bmdma_init);
*/
void ata_sff_port_init(struct ata_port *ap)
{
INIT_DELAYED_WORK(&ap->sff_pio_task, ata_sff_pio_task);
ap->ctl = ATA_DEVCTL_OBS;
ap->last_ctl = 0xFF;
}
int __init ata_sff_init(void)
{
/*
* FIXME: In UP case, there is only one workqueue thread and if you
* have more than one PIO device, latency is bloody awful, with
* occasional multi-second "hiccups" as one PIO device waits for
* another. It's an ugly wart that users DO occasionally complain
* about; luckily most users have at most one PIO polled device.
*/
ata_sff_wq = create_workqueue("ata_sff");
if (!ata_sff_wq)
return -ENOMEM;
return 0;
}
void __exit ata_sff_exit(void)
{
destroy_workqueue(ata_sff_wq);
}

5
drivers/ata/libata.h
View File

@ -79,7 +79,6 @@ extern int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
u64 block, u32 n_block, unsigned int tf_flags,
unsigned int tag);
extern u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev);
extern void ata_port_flush_task(struct ata_port *ap);
extern unsigned ata_exec_internal(struct ata_device *dev,
struct ata_taskfile *tf, const u8 *cdb,
int dma_dir, void *buf, unsigned int buflen,
@ -202,11 +201,13 @@ static inline int sata_pmp_attach(struct ata_device *dev)
/* libata-sff.c */
#ifdef CONFIG_ATA_SFF
extern void ata_pio_task(struct work_struct *work);
extern void ata_sff_flush_pio_task(struct ata_port *ap);
extern void ata_sff_port_init(struct ata_port *ap);
extern int ata_sff_init(void);
extern void ata_sff_exit(void);
#else /* CONFIG_ATA_SFF */
static inline void ata_sff_flush_pio_task(struct ata_port *ap)
{ }
static inline void ata_sff_port_init(struct ata_port *ap)
{ }
static inline int ata_sff_init(void)

2
drivers/ata/sata_mv.c
View File

@ -2262,7 +2262,7 @@ static unsigned int mv_qc_issue_fis(struct ata_queued_cmd *qc)
}
if (qc->tf.flags & ATA_TFLAG_POLLING)
ata_pio_queue_task(ap, qc, 0);
ata_sff_queue_pio_task(ap, 0);
return 0;
}

7
include/linux/libata.h
View File

@ -723,6 +723,7 @@ struct ata_port {
struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */
u8 ctl; /* cache of ATA control register */
u8 last_ctl; /* Cache last written value */
struct delayed_work sff_pio_task;
#endif /* CONFIG_ATA_SFF */
unsigned int pio_mask;
@ -746,8 +747,6 @@ struct ata_port {
struct ata_host *host;
struct device *dev;
void *port_task_data;
struct delayed_work port_task;
struct delayed_work hotplug_task;
struct work_struct scsi_rescan_task;
@ -1031,9 +1030,6 @@ extern int ata_cable_sata(struct ata_port *ap);
extern int ata_cable_ignore(struct ata_port *ap);
extern int ata_cable_unknown(struct ata_port *ap);
extern void ata_pio_queue_task(struct ata_port *ap, void *data,
unsigned long delay);
/* Timing helpers */
extern unsigned int ata_pio_need_iordy(const struct ata_device *);
extern const struct ata_timing *ata_timing_find_mode(u8 xfer_mode);
@ -1597,6 +1593,7 @@ extern void ata_sff_irq_on(struct ata_port *ap);
extern void ata_sff_irq_clear(struct ata_port *ap);
extern int ata_sff_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
u8 status, int in_wq);
extern void ata_sff_queue_pio_task(struct ata_port *ap, unsigned long delay);
extern unsigned int ata_sff_qc_issue(struct ata_queued_cmd *qc);
extern bool ata_sff_qc_fill_rtf(struct ata_queued_cmd *qc);
extern unsigned int ata_sff_host_intr(struct ata_port *ap,