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libata-link: add PMP links

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Add link->pmp, ap->nr_pmp_links, ap->pmp_link[], and implement/update
link helpers.

printk helpers are updated such that port and link are identifed as
'ataP:' if no PMP is attached, while device is identified as
'ataP.DD:'.  If PMP is attached, they become 'ataP:', 'ataP.LL:' and
'ataP.LL' - ie. link and device are identified their PMP number.

If PPM is attached (ap->nr_pmp_links != 0), ata_for_each_link()
iterates over PMP links, while __ata_for_each_link() iterates over the
host link + PMP links.  If PMP is not attached (ap->nr_pmp_links ==
0), both iterate over only the host link.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-08-06 18:36:23 +09:00 committed by Jeff Garzik
parent dbd826168d
commit 8989805d6d
2 changed files with 51 additions and 8 deletions
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6
drivers/ata/libata-core.c
View File

@ -6064,13 +6064,14 @@ void ata_dev_init(struct ata_device *dev)
* ata_link_init - Initialize an ata_link structure
* @ap: ATA port link is attached to
* @link: Link structure to initialize
* @pmp: Port multiplier port number
*
* Initialize @link.
*
* LOCKING:
* Kernel thread context (may sleep)
*/
static void ata_link_init(struct ata_port *ap, struct ata_link *link)
static void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
{
int i;
@ -6078,6 +6079,7 @@ static void ata_link_init(struct ata_port *ap, struct ata_link *link)
memset(link, 0, offsetof(struct ata_link, device[0]));
link->ap = ap;
link->pmp = pmp;
link->active_tag = ATA_TAG_POISON;
link->hw_sata_spd_limit = UINT_MAX;
@ -6173,7 +6175,7 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
ap->cbl = ATA_CBL_NONE;
ata_link_init(ap, &ap->link);
ata_link_init(ap, &ap->link, 0);
#ifdef ATA_IRQ_TRAP
ap->stats.unhandled_irq = 1;

53
include/linux/libata.h
View File

@ -515,6 +515,7 @@ struct ata_acpi_gtm {
struct ata_link {
struct ata_port *ap;
int pmp; /* port multiplier port # */
unsigned int active_tag; /* active tag on this link */
u32 sactive; /* active NCQ commands */
@ -563,6 +564,9 @@ struct ata_port {
struct ata_link link; /* host default link */
int nr_pmp_links; /* nr of available PMP links */
struct ata_link *pmp_link; /* array of PMP links */
struct ata_port_stats stats;
struct ata_host *host;
struct device *dev;
@ -926,11 +930,17 @@ extern void ata_do_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
#define ata_port_printk(ap, lv, fmt, args...) \
printk(lv"ata%u: "fmt, (ap)->print_id , ##args)
#define ata_link_printk(link, lv, fmt, args...) \
printk(lv"ata%u: "fmt, (link)->ap->print_id , ##args)
#define ata_link_printk(link, lv, fmt, args...) do { \
if ((link)->ap->nr_pmp_links) \
printk(lv"ata%u.%02u: "fmt, (link)->ap->print_id, \
(link)->pmp , ##args); \
else \
printk(lv"ata%u: "fmt, (link)->ap->print_id , ##args); \
} while(0)
#define ata_dev_printk(dev, lv, fmt, args...) \
printk(lv"ata%u.%02u: "fmt, (dev)->link->ap->print_id, (dev)->devno , ##args)
printk(lv"ata%u.%02u: "fmt, (dev)->link->ap->print_id, \
(dev)->link->pmp + (dev)->devno , ##args)
/*
* ata_eh_info helpers
@ -1039,15 +1049,46 @@ 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 (link->ap->flags & ATA_FLAG_SLAVE_POSS)
if (ata_is_host_link(link) && link->ap->flags & ATA_FLAG_SLAVE_POSS)
return 2;
return 1;
}
#define ata_port_for_each_link(lk, ap) \
for ((lk) = &(ap)->link; (lk); (lk) = NULL)
static inline struct ata_link *ata_port_first_link(struct ata_port *ap)
{
if (ap->nr_pmp_links)
return ap->pmp_link;
return &ap->link;
}
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)
return NULL;
return ap->pmp_link;
}
if (++link - ap->pmp_link < ap->nr_pmp_links)
return link;
return NULL;
}
#define __ata_port_for_each_link(lk, ap) \
for ((lk) = &(ap)->link; (lk); (lk) = ata_port_next_link(lk))
#define ata_port_for_each_link(link, ap) \
for ((link) = ata_port_first_link(ap); (link); \
(link) = ata_port_next_link(link))
#define ata_link_for_each_dev(dev, link) \
for ((dev) = (link)->device; \