libata: implement and use ata_port_desc() to report port configuration

Currently, port configuration reporting has the following problems.

* iomapped address is reported instead of raw address
* report contains irrelevant fields or lacks necessary fields for
  non-SFF controllers.
* host->irq/irq2 are there just for reporting and hacky.

This patch implements and uses ata_port_desc() and
ata_port_pbar_desc().  ata_port_desc() is almost identical to
ata_ehi_push_desc() except that it takes @ap instead of @ehi, has no
locking requirement, can only be used during host initialization and "
" is used as separator instead of ", ".  ata_port_pbar_desc() is a
helper to ease reporting of a PCI BAR or an offsetted address into it.

LLD pushes whatever description it wants using the above two
functions.  The accumulated description is printed on host
registration after "[S/P]ATA max MAX_XFERMODE ".

SFF init helpers and ata_host_activate() automatically add
descriptions for addresses and irq respectively, so only LLDs which
isn't standard SFF need to add custom descriptions.  In many cases,
such controllers need to report different things anyway.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index e7d163edb4c0..d3defae689ca 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -368,8 +368,6 @@ struct ata_ioports {
 struct ata_host {
         spinlock_t              lock;
         struct device           *dev;
-        unsigned long           irq;
-        unsigned long           irq2;
         void __iomem * const    *iomap;
         unsigned int            n_ports;
         void                    *private_data;
@@ -969,6 +967,16 @@ static inline void ata_ehi_hotplugged(struct ata_eh_info *ehi)
 }
 
 /*
+ * port description helpers
+ */
+extern void ata_port_desc(struct ata_port *ap, const char *fmt, ...)
+        __attribute__ ((format (printf, 2, 3)));
+#ifdef CONFIG_PCI
+extern void ata_port_pbar_desc(struct ata_port *ap, int bar, ssize_t offset,
+                               const char *name);
+#endif
+
+/*
  * qc helpers
  */
 static inline int