Some SAS HBAs don't want to go to the trouble of tracking port numbers,
so they'd simply like to say "add this port and give it a number".
This is especially beneficial from the hotplug point of view, since
tracking ports and the available number space can be a real pain.
The current implementation uses an incrementing number per expander to
add the port on. However, since there can never be more ports than
there are phys, a later implementation will try to be more intelligent
about this.
James
Index: BUILD-2.6/drivers/scsi/scsi_transport_sas.c
===================================================================
--- BUILD-2.6.orig/drivers/scsi/scsi_transport_sas.c 2006-06-30 21:40:34.000000000 -0500
+++ BUILD-2.6/drivers/scsi/scsi_transport_sas.c 2006-07-01 08:52:35.000000000 -0500
@@ -41,6 +41,7 @@
struct mutex lock;
u32 next_target_id;
u32 next_expander_id;
+ int next_port_id;
};
#define to_sas_host_attrs(host) ((struct sas_host_attrs *)(host)->shost_data)
@@ -146,6 +147,7 @@
mutex_init(&sas_host->lock);
sas_host->next_target_id = 0;
sas_host->next_expander_id = 0;
+ sas_host->next_port_id = 0;
return 0;
}
@@ -327,7 +329,7 @@
sas_phy_simple_attr(identify.sas_address, sas_address, "0x%016llx\n",
unsigned long long);
sas_phy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
-//sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", u8);
+//sas_phy_simple_attr(port_identifier, port_identifier, "%d\n", int);
sas_phy_linkspeed_attr(negotiated_linkrate);
sas_phy_linkspeed_attr(minimum_linkrate_hw);
sas_phy_linkspeed_attr(minimum_linkrate);
@@ -590,6 +592,38 @@
}
EXPORT_SYMBOL(sas_port_alloc);
+/** sas_port_alloc_num - allocate and initialize a SAS port structure
+ *
+ * @parent: parent device
+ *
+ * Allocates a SAS port structure and a number to go with it. This
+ * interface is really for adapters where the port number has no
+ * meansing, so the sas class should manage them. It will be added to
+ * the device tree below the device specified by @parent which must be
+ * either a Scsi_Host or a sas_expander_device.
+ *
+ * Returns %NULL on error
+ */
+struct sas_port *sas_port_alloc_num(struct device *parent)
+{
+ int index;
+ struct Scsi_Host *shost = dev_to_shost(parent);
+ struct sas_host_attrs *sas_host = to_sas_host_attrs(shost);
+
+ /* FIXME: use idr for this eventually */
+ mutex_lock(&sas_host->lock);
+ if (scsi_is_sas_expander_device(parent)) {
+ struct sas_rphy *rphy = dev_to_rphy(parent);
+ struct sas_expander_device *exp = rphy_to_expander_device(rphy);
+
+ index = exp->next_port_id++;
+ } else
+ index = sas_host->next_port_id++;
+ mutex_unlock(&sas_host->lock);
+ return sas_port_alloc(parent, index);
+}
+EXPORT_SYMBOL(sas_port_alloc_num);
+
/**
* sas_port_add - add a SAS port to the device hierarchy
*
Index: BUILD-2.6/include/scsi/scsi_transport_sas.h
===================================================================
--- BUILD-2.6.orig/include/scsi/scsi_transport_sas.h 2006-06-30 21:40:34.000000000 -0500
+++ BUILD-2.6/include/scsi/scsi_transport_sas.h 2006-07-01 08:39:30.000000000 -0500
@@ -106,6 +106,7 @@
struct sas_expander_device {
int level;
+ int next_port_id;
#define SAS_EXPANDER_VENDOR_ID_LEN 8
char vendor_id[SAS_EXPANDER_VENDOR_ID_LEN+1];
@@ -127,7 +128,7 @@
struct sas_port {
struct device dev;
- u8 port_identifier;
+ int port_identifier;
int num_phys;
/* the other end of the link */
@@ -168,6 +169,7 @@
extern int scsi_is_sas_rphy(const struct device *);
struct sas_port *sas_port_alloc(struct device *, int);
+struct sas_port *sas_port_alloc_num(struct device *);
int sas_port_add(struct sas_port *);
void sas_port_free(struct sas_port *);
void sas_port_delete(struct sas_port *);
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