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@xxxxxxxxx>
---
drivers/scsi/libata-core.c | 6 +++--
include/linux/libata.h | 52 +++++++++++++++++++++++++++++++++++++++-----
2 files changed, 50 insertions(+), 8 deletions(-)
bbd82bc108860dff2c2f37de3bf4afaf42c2c6eb
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 25bc6d7..0cf2661 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -5325,13 +5325,14 @@ 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)
{
struct ata_device *dev;
@@ -5339,6 +5340,7 @@ static void ata_link_init(struct ata_por
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;
link->reset_tries = ATA_EH_RESET_TRIES;
@@ -5444,7 +5446,7 @@ #endif
if (ap->flags & ATA_FLAG_SATA)
ap->cbl = ATA_CBL_SATA;
- ata_link_init(ap, &ap->link);
+ ata_link_init(ap, &ap->link, 0);
#ifdef ATA_IRQ_TRAP
ap->stats.unhandled_irq = 1;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7d09ccc..b6715c1 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -499,6 +499,7 @@ struct ata_eh_context {
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 */
@@ -548,6 +549,9 @@ struct ata_port {
struct ata_link link; /* host default link */
struct ata_device __dev1; /* storage for link.device[1] */
+ int nr_pmp_links; /* nr of available PMP links */
+ struct ata_link *pmp_link; /* array of PMP links */
+
struct ata_host_stats stats;
struct ata_host_set *host_set;
struct device *dev;
@@ -864,11 +868,16 @@ extern void ata_do_eh(struct ata_port *a
#define ata_port_printk(ap, lv, fmt, args...) \
printk(lv"ata%u: "fmt, (ap)->id , ##args)
-#define ata_link_printk(link, lv, fmt, args...) \
- printk(lv"ata%u: "fmt, (link)->ap->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->id, (link)->pmp , ##args); \
+ else \
+ printk(lv"ata%u: "fmt, (link)->ap->id , ##args); \
+ } while(0)
#define ata_dev_printk(dev, lv, fmt, args...) \
- printk(lv"ata%u.%02u: "fmt, (dev)->link->ap->id, (dev)->devno , ##args)
+ printk(lv"ata%u.%02u: "fmt, (dev)->link->ap->id, \
+ (dev)->link->pmp + (dev)->devno , ##args)
/*
* ata_eh_info helpers
@@ -993,15 +1002,46 @@ static inline unsigned int ata_dev_ready
/*
* 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; \
--
1.3.2
-
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