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libata: implement PMP helpers

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Implement helpers to test whether PMP is supported, attached and
determine pmp number to use when issuing SRST to a link.  While at it,
move ata_is_host_link() so that it's together with the two new PMP
helpers.

This change simplifies LLDs and helps making PMP support optional.

Signed-off-by: Tejun Heo <htejun@gmail.com>
This commit is contained in:
Tejun Heo 2008-04-07 22:47:22 +09:00 • committed by Jeff Garzik
parent 48515f6c00
commit 071f44b1d2
8 changed files with 58 additions and 69 deletions
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38
include/linux/libata.h
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@ -1089,6 +1089,31 @@ extern const struct ata_port_operations sata_port_ops;
ATA_BASE_SHT(drv_name), \
.change_queue_depth = ata_scsi_change_queue_depth
/*
* PMP helpers
*/
static inline bool sata_pmp_supported(struct ata_port *ap)
{
return ap->flags & ATA_FLAG_PMP;
}
static inline bool sata_pmp_attached(struct ata_port *ap)
{
return ap->nr_pmp_links != 0;
}
static inline int ata_is_host_link(const struct ata_link *link)
{
return link == &link->ap->link;
}
static inline int sata_srst_pmp(struct ata_link *link)
{
if (sata_pmp_supported(link->ap) && ata_is_host_link(link))
return SATA_PMP_CTRL_PORT;
return link->pmp;
}
/*
* printk helpers
*/
@ -1096,7 +1121,7 @@ extern const struct ata_port_operations sata_port_ops;
printk("%sata%u: "fmt, lv, (ap)->print_id , ##args)
#define ata_link_printk(link, lv, fmt, args...) do { \
if ((link)->ap->nr_pmp_links) \
if (sata_pmp_attached((link)->ap)) \
printk("%sata%u.%02u: "fmt, lv, (link)->ap->print_id, \
(link)->pmp , ##args); \
else \
@ -1182,11 +1207,6 @@ static inline unsigned int ata_dev_absent(const struct ata_device *dev)
/*
* link helpers
*/
static inline int ata_is_host_link(const struct ata_link *link)
{
return link == &link->ap->link;
}
static inline int ata_link_max_devices(const struct ata_link *link)
{
if (ata_is_host_link(link) && link->ap->flags & ATA_FLAG_SLAVE_POSS)
@ -1201,7 +1221,7 @@ static inline int ata_link_active(struct ata_link *link)
static inline struct ata_link *ata_port_first_link(struct ata_port *ap)
{
if (ap->nr_pmp_links)
if (sata_pmp_attached(ap))
return ap->pmp_link;
return &ap->link;
}
@ -1210,8 +1230,8 @@ static inline struct ata_link *ata_port_next_link(struct ata_link *link)
{
struct ata_port *ap = link->ap;
if (link == &ap->link) {
if (!ap->nr_pmp_links)
if (ata_is_host_link(link)) {
if (!sata_pmp_attached(ap))
return NULL;
return ap->pmp_link;
}