summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--drivers/scsi/scsi_sas_internal.h2
-rw-r--r--drivers/scsi/scsi_transport_sas.c103
-rw-r--r--include/scsi/scsi_transport_sas.h7
3 files changed, 105 insertions, 7 deletions
diff --git a/drivers/scsi/scsi_sas_internal.h b/drivers/scsi/scsi_sas_internal.h
index 998cb5be6833..6266a5d73d0f 100644
--- a/drivers/scsi/scsi_sas_internal.h
+++ b/drivers/scsi/scsi_sas_internal.h
@@ -5,7 +5,7 @@
#define SAS_PHY_ATTRS 17
#define SAS_PORT_ATTRS 1
#define SAS_RPORT_ATTRS 7
-#define SAS_END_DEV_ATTRS 3
+#define SAS_END_DEV_ATTRS 5
#define SAS_EXPANDER_ATTRS 7
struct sas_internal {
diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index f27e52d963d3..927e99cb7225 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -155,6 +155,17 @@ static struct {
sas_bitfield_name_search(linkspeed, sas_linkspeed_names)
sas_bitfield_name_set(linkspeed, sas_linkspeed_names)
+static struct sas_end_device *sas_sdev_to_rdev(struct scsi_device *sdev)
+{
+ struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
+ struct sas_end_device *rdev;
+
+ BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
+
+ rdev = rphy_to_end_device(rphy);
+ return rdev;
+}
+
static void sas_smp_request(struct request_queue *q, struct Scsi_Host *shost,
struct sas_rphy *rphy)
{
@@ -358,6 +369,85 @@ void sas_remove_host(struct Scsi_Host *shost)
}
EXPORT_SYMBOL(sas_remove_host);
+/**
+ * sas_tlr_supported - checking TLR bit in vpd 0x90
+ * @sdev: scsi device struct
+ *
+ * Check Transport Layer Retries are supported or not.
+ * If vpd page 0x90 is present, TRL is supported.
+ *
+ */
+unsigned int
+sas_tlr_supported(struct scsi_device *sdev)
+{
+ const int vpd_len = 32;
+ struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+ char *buffer = kzalloc(vpd_len, GFP_KERNEL);
+ int ret = 0;
+
+ if (scsi_get_vpd_page(sdev, 0x90, buffer, vpd_len))
+ goto out;
+
+ /*
+ * Magic numbers: the VPD Protocol page (0x90)
+ * has a 4 byte header and then one entry per device port
+ * the TLR bit is at offset 8 on each port entry
+ * if we take the first port, that's at total offset 12
+ */
+ ret = buffer[12] & 0x01;
+
+ out:
+ kfree(buffer);
+ rdev->tlr_supported = ret;
+ return ret;
+
+}
+EXPORT_SYMBOL_GPL(sas_tlr_supported);
+
+/**
+ * sas_disable_tlr - setting TLR flags
+ * @sdev: scsi device struct
+ *
+ * Seting tlr_enabled flag to 0.
+ *
+ */
+void
+sas_disable_tlr(struct scsi_device *sdev)
+{
+ struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+
+ rdev->tlr_enabled = 0;
+}
+EXPORT_SYMBOL_GPL(sas_disable_tlr);
+
+/**
+ * sas_enable_tlr - setting TLR flags
+ * @sdev: scsi device struct
+ *
+ * Seting tlr_enabled flag 1.
+ *
+ */
+void sas_enable_tlr(struct scsi_device *sdev)
+{
+ unsigned int tlr_supported = 0;
+ tlr_supported = sas_tlr_supported(sdev);
+
+ if (tlr_supported) {
+ struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+
+ rdev->tlr_enabled = 1;
+ }
+
+ return;
+}
+EXPORT_SYMBOL_GPL(sas_enable_tlr);
+
+unsigned int sas_is_tlr_enabled(struct scsi_device *sdev)
+{
+ struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
+ return rdev->tlr_enabled;
+}
+EXPORT_SYMBOL_GPL(sas_is_tlr_enabled);
/*
* SAS Phy attributes
@@ -1146,15 +1236,10 @@ sas_rphy_simple_attr(identify.phy_identifier, phy_identifier, "%d\n", u8);
int sas_read_port_mode_page(struct scsi_device *sdev)
{
char *buffer = kzalloc(BUF_SIZE, GFP_KERNEL), *msdata;
- struct sas_rphy *rphy = target_to_rphy(sdev->sdev_target);
- struct sas_end_device *rdev;
+ struct sas_end_device *rdev = sas_sdev_to_rdev(sdev);
struct scsi_mode_data mode_data;
int res, error;
- BUG_ON(rphy->identify.device_type != SAS_END_DEVICE);
-
- rdev = rphy_to_end_device(rphy);
-
if (!buffer)
return -ENOMEM;
@@ -1207,6 +1292,10 @@ sas_end_dev_simple_attr(I_T_nexus_loss_timeout, I_T_nexus_loss_timeout,
"%d\n", int);
sas_end_dev_simple_attr(initiator_response_timeout, initiator_response_timeout,
"%d\n", int);
+sas_end_dev_simple_attr(tlr_supported, tlr_supported,
+ "%d\n", int);
+sas_end_dev_simple_attr(tlr_enabled, tlr_enabled,
+ "%d\n", int);
static DECLARE_TRANSPORT_CLASS(sas_expander_class,
"sas_expander", NULL, NULL, NULL);
@@ -1733,6 +1822,8 @@ sas_attach_transport(struct sas_function_template *ft)
SETUP_END_DEV_ATTRIBUTE(end_dev_ready_led_meaning);
SETUP_END_DEV_ATTRIBUTE(end_dev_I_T_nexus_loss_timeout);
SETUP_END_DEV_ATTRIBUTE(end_dev_initiator_response_timeout);
+ SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_supported);
+ SETUP_END_DEV_ATTRIBUTE(end_dev_tlr_enabled);
i->end_dev_attrs[count] = NULL;
count = 0;
diff --git a/include/scsi/scsi_transport_sas.h b/include/scsi/scsi_transport_sas.h
index 61ad3594aad6..ffeebc34a4f7 100644
--- a/include/scsi/scsi_transport_sas.h
+++ b/include/scsi/scsi_transport_sas.h
@@ -107,6 +107,8 @@ struct sas_end_device {
struct sas_rphy rphy;
/* flags */
unsigned ready_led_meaning:1;
+ unsigned tlr_supported:1;
+ unsigned tlr_enabled:1;
/* parameters */
u16 I_T_nexus_loss_timeout;
u16 initiator_response_timeout;
@@ -181,6 +183,11 @@ extern int sas_phy_add(struct sas_phy *);
extern void sas_phy_delete(struct sas_phy *);
extern int scsi_is_sas_phy(const struct device *);
+unsigned int sas_tlr_supported(struct scsi_device *);
+unsigned int sas_is_tlr_enabled(struct scsi_device *);
+void sas_disable_tlr(struct scsi_device *);
+void sas_enable_tlr(struct scsi_device *);
+
extern struct sas_rphy *sas_end_device_alloc(struct sas_port *);
extern struct sas_rphy *sas_expander_alloc(struct sas_port *, enum sas_device_type);
void sas_rphy_free(struct sas_rphy *);