scsi: lpfc: Add support for optional PLDV handling

At adapter attachment or SLI port initialization, read the SLIPORT_STATUS
register to check for pldv_enable. If found, the driver will perform a PCIe
configuration space write when attaching to an SLI port instance that is an
LPe32000 series adapter.

Link: https://lore.kernel.org/r/20210927183518.22130-1-jsmart2021@gmail.comCo-developed-by: Nigel Kirkland <nkirkland2304@gmail.com>
Signed-off-by: Nigel Kirkland <nkirkland2304@gmail.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/lpfc/lpfc_hw4.h

@@ -673,6 +673,10 @@ struct lpfc_register {
 #define lpfc_sliport_status_rdy_SHIFT	23
 #define lpfc_sliport_status_rdy_MASK	0x1
 #define lpfc_sliport_status_rdy_WORD	word0
+#define lpfc_sliport_status_pldv_SHIFT	0
+#define lpfc_sliport_status_pldv_MASK	0x1
+#define lpfc_sliport_status_pldv_WORD	word0
+#define CFG_PLD				0x3C
 #define MAX_IF_TYPE_2_RESETS		6
 
 #define LPFC_CTL_PORT_CTL_OFFSET	0x408

drivers/scsi/lpfc/lpfc_init.c

@@ -68,6 +68,7 @@
 static enum cpuhp_state lpfc_cpuhp_state;
 /* Used when mapping IRQ vectors in a driver centric manner */
 static uint32_t lpfc_present_cpu;
+static bool lpfc_pldv_detect;
 
 static void __lpfc_cpuhp_remove(struct lpfc_hba *phba);
 static void lpfc_cpuhp_remove(struct lpfc_hba *phba);
@@ -9359,7 +9360,15 @@ lpfc_sli4_post_status_check(struct lpfc_hba *phba)
 					phba->work_status[0],
 					phba->work_status[1]);
 				port_error = -ENODEV;
+				break;
 			}
+
+			if (lpfc_pldv_detect &&
+			    bf_get(lpfc_sli_intf_sli_family,
+				   &phba->sli4_hba.sli_intf) ==
+					LPFC_SLI_INTF_FAMILY_G6)
+				pci_write_config_byte(phba->pcidev,
+						      LPFC_SLI_INTF, CFG_PLD);
 			break;
 		case LPFC_SLI_INTF_IF_TYPE_1:
 		default:
@@ -11567,6 +11576,9 @@ lpfc_pci_function_reset(struct lpfc_hba *phba)
 			goto out;
 		}
 
+		if (bf_get(lpfc_sliport_status_pldv, &reg_data))
+			lpfc_pldv_detect = true;
+
 		if (!port_reset) {
 			/*
 			 * Reset the port now
@@ -15560,6 +15572,8 @@ lpfc_init(void)
 	/* Initialize in case vector mapping is needed */
 	lpfc_present_cpu = num_present_cpus();
 
+	lpfc_pldv_detect = false;
+
 	error = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
 					"lpfc/sli4:online",
 					lpfc_cpu_online, lpfc_cpu_offline);