[SCSI] isci: export phy events via ->lldd_control_phy()

Allow the sas-transport-class to update events for local phys via a new
PHY_FUNC_GET_EVENTS command to ->lldd_control_phy().  Fixup drivers that
are not prepared for new enum phy_func values, and unify
->lldd_control_phy() error codes.

These are the SAS defined phy events that are reported in a
smp-report-phy-error-log command:
 * /sys/class/sas_phy/<phyX>/invalid_dword_count
 * /sys/class/sas_phy/<phyX>/running_disparity_error_count
 * /sys/class/sas_phy/<phyX>/loss_of_dword_sync_count
 * /sys/class/sas_phy/<phyX>/phy_reset_problem_count
Signed-off-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NJames Bottomley <JBottomley@Parallels.com>

drivers/scsi/aic94xx/aic94xx_scb.c

@@ -906,6 +906,7 @@ int asd_control_phy(struct asd_sas_phy *phy, enum phy_func func, void *arg)
 
 	switch (func) {
 	case PHY_FUNC_CLEAR_ERROR_LOG:
+	case PHY_FUNC_GET_EVENTS:
 		return -ENOSYS;
 	case PHY_FUNC_SET_LINK_RATE:
 		rates = arg;

drivers/scsi/isci/phy.c

@@ -1313,6 +1313,17 @@ int isci_phy_control(struct asd_sas_phy *sas_phy,
 		ret = isci_port_perform_hard_reset(ihost, iport, iphy);
 
 		break;
+	case PHY_FUNC_GET_EVENTS: {
+		struct scu_link_layer_registers __iomem *r;
+		struct sas_phy *phy = sas_phy->phy;
+
+		r = iphy->link_layer_registers;
+		phy->running_disparity_error_count = readl(&r->running_disparity_error_count);
+		phy->loss_of_dword_sync_count = readl(&r->loss_of_sync_error_count);
+		phy->phy_reset_problem_count = readl(&r->phy_reset_problem_count);
+		phy->invalid_dword_count = readl(&r->invalid_dword_counter);
+		break;
+	}
 
 	default:
 		dev_dbg(&ihost->pdev->dev,

drivers/scsi/libsas/sas_init.c

@@ -177,10 +177,15 @@ int sas_unregister_ha(struct sas_ha_struct *sas_ha)
 
 static int sas_get_linkerrors(struct sas_phy *phy)
 {
-	if (scsi_is_sas_phy_local(phy))
-		/* FIXME: we have no local phy stats
-		 * gathering at this time */
-		return -EINVAL;
+	if (scsi_is_sas_phy_local(phy)) {
+		struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
+		struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+		struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number];
+		struct sas_internal *i =
+			to_sas_internal(sas_ha->core.shost->transportt);
+
+		return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL);
+	}
 
 	return sas_smp_get_phy_events(phy);
 }

drivers/scsi/mvsas/mv_sas.c

@@ -214,7 +214,7 @@ int mvs_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
 		break;
 	case PHY_FUNC_RELEASE_SPINUP_HOLD:
 	default:
-		rc = -EOPNOTSUPP;
+		rc = -ENOSYS;
 	}
 	msleep(200);
 	return rc;

drivers/scsi/pm8001/pm8001_sas.c

@@ -210,7 +210,7 @@ int pm8001_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
 		PM8001_CHIP_DISP->phy_stop_req(pm8001_ha, phy_id);
 		break;
 	default:
-		rc = -EOPNOTSUPP;
+		rc = -ENOSYS;
 	}
 	msleep(300);
 	return rc;

include/scsi/sas.h

@@ -122,6 +122,7 @@ enum phy_func {
 	PHY_FUNC_TX_SATA_PS_SIGNAL,
 	PHY_FUNC_RELEASE_SPINUP_HOLD = 0x10, /* LOCAL PORT ONLY! */
 	PHY_FUNC_SET_LINK_RATE,
+	PHY_FUNC_GET_EVENTS,
 };
 
 /* SAS LLDD would need to report only _very_few_ of those, like BROADCAST.