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libata-link: introduce ata_link

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Introduce ata_link.  It abstracts PHY and sits between ata_port and
ata_device.  This new level of abstraction is necessary to support
SATA Port Multiplier, which basically adds a bunch of links (PHYs) to
a ATA host port.  Fields related to command execution, spd_limit and
EH are per-link and thus moved to ata_link.

This patch only defines the host link.  Multiple link handling will be
added later.  Also, a lot of ap->link derefences are added but many of
them will be removed as each part is converted to deal directly with
ata_link instead of ata_port.

This patch introduces no behavior change.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo
2007-08-06 18:36:22 +09:00
committed by Jeff Garzik
parent 640fdb5049
commit 9af5c9c97d
33 changed files with 280 additions and 255 deletions
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41
drivers/ata/libata-scsi.c
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@@ -1368,14 +1368,14 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
case ATA_CMD_SET_FEATURES:
if ((qc->tf.feature == SETFEATURES_WC_ON) ||
(qc->tf.feature == SETFEATURES_WC_OFF)) {
ap->eh_info.action |= ATA_EH_REVALIDATE;
ap->link.eh_info.action |= ATA_EH_REVALIDATE;
ata_port_schedule_eh(ap);
}
break;
case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
case ATA_CMD_SET_MULTI: /* multi_count changed */
ap->eh_info.action |= ATA_EH_REVALIDATE;
ap->link.eh_info.action |= ATA_EH_REVALIDATE;
ata_port_schedule_eh(ap);
break;
}
@@ -1439,14 +1439,14 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
*/
static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
{
struct ata_port *ap = dev->ap;
struct ata_link *link = dev->link;
int is_ncq = is_io && ata_ncq_enabled(dev);
if (is_ncq) {
if (!ata_tag_valid(ap->active_tag))
if (!ata_tag_valid(link->active_tag))
return 0;
} else {
if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
if (!ata_tag_valid(link->active_tag) && !link->sactive)
return 0;
}
return 1;
@@ -2426,7 +2426,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
{
if (likely(id < ATA_MAX_DEVICES))
return &ap->device[id];
return &ap->link.device[id];
return NULL;
}
@@ -2458,7 +2458,7 @@ static int ata_scsi_dev_enabled(struct ata_device *dev)
if (unlikely(!ata_dev_enabled(dev)))
return 0;
if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
if (unlikely(dev->class == ATA_DEV_ATAPI)) {
ata_dev_printk(dev, KERN_WARNING,
"WARNING: ATAPI is %s, device ignored.\n",
@@ -2961,7 +2961,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct scsi_device *sdev;
dev = &ap->device[i];
dev = &ap->link.device[i];
if (!ata_dev_enabled(dev) || dev->sdev)
continue;
@@ -2978,7 +2978,7 @@ void ata_scsi_scan_host(struct ata_port *ap, int sync)
* whether all devices are attached.
*/
for (i = 0; i < ATA_MAX_DEVICES; i++) {
dev = &ap->device[i];
dev = &ap->link.device[i];
if (ata_dev_enabled(dev) && !dev->sdev)
break;
}
@@ -3049,7 +3049,7 @@ int ata_scsi_offline_dev(struct ata_device *dev)
*/
static void ata_scsi_remove_dev(struct ata_device *dev)
{
struct ata_port *ap = dev->ap;
struct ata_port *ap = dev->link->ap;
struct scsi_device *sdev;
unsigned long flags;
@@ -3123,7 +3123,7 @@ void ata_scsi_hotplug(struct work_struct *work)
/* unplug detached devices */
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
struct ata_device *dev = &ap->link.device[i];
unsigned long flags;
if (!(dev->flags & ATA_DFLAG_DETACHED))
@@ -3162,6 +3162,7 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
unsigned int id, unsigned int lun)
{
struct ata_port *ap = ata_shost_to_port(shost);
struct ata_eh_info *ehi = &ap->link.eh_info;
unsigned long flags;
int rc = 0;
@@ -3175,15 +3176,15 @@ static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
spin_lock_irqsave(ap->lock, flags);
if (id == SCAN_WILD_CARD) {
ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
ap->eh_info.action |= ATA_EH_SOFTRESET;
ehi->probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
ehi->action |= ATA_EH_SOFTRESET;
} else {
struct ata_device *dev = ata_find_dev(ap, id);
if (dev) {
ap->eh_info.probe_mask |= 1 << dev->devno;
ap->eh_info.action |= ATA_EH_SOFTRESET;
ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
ehi->probe_mask |= 1 << dev->devno;
ehi->action |= ATA_EH_SOFTRESET;
ehi->flags |= ATA_EHI_RESUME_LINK;
} else
rc = -EINVAL;
}
@@ -3220,7 +3221,7 @@ void ata_scsi_dev_rescan(struct work_struct *work)
spin_lock_irqsave(ap->lock, flags);
for (i = 0; i < ATA_MAX_DEVICES; i++) {
struct ata_device *dev = &ap->device[i];
struct ata_device *dev = &ap->link.device[i];
struct scsi_device *sdev = dev->sdev;
if (!ata_dev_enabled(dev) || !sdev)
@@ -3359,7 +3360,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
{
ata_scsi_sdev_config(sdev);
ata_scsi_dev_config(sdev, ap->device);
ata_scsi_dev_config(sdev, ap->link.device);
return 0;
}
EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
@@ -3382,8 +3383,8 @@ int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
ata_scsi_dump_cdb(ap, cmd);
if (likely(ata_scsi_dev_enabled(ap->device)))
rc = __ata_scsi_queuecmd(cmd, done, ap->device);
if (likely(ata_scsi_dev_enabled(ap->link.device)))
rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
else {
cmd->result = (DID_BAD_TARGET << 16);
done(cmd);