scsi: smartpqi: add kdump support

Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

4 files changed, 57 insertions, 3 deletions

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index 053be6be2077..5f965adfab32 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -79,11 +79,13 @@ struct pqi_ctrl_registers {
         __le32  sis_ctrl_to_host_doorbell;              /* 9Ch */
         u8      reserved3[0xa0 - (0x9c + sizeof(__le32))];
         __le32  sis_ctrl_to_host_doorbell_clear;        /* A0h */
-        u8      reserved4[0xbc - (0xa0 + sizeof(__le32))];
+        u8      reserved4[0xb0 - (0xa0 + sizeof(__le32))];
+        __le32  sis_driver_scratch;                     /* B0h */
+        u8      reserved5[0xbc - (0xb0 + sizeof(__le32))];
         __le32  sis_firmware_status;                    /* BCh */
-        u8      reserved5[0x1000 - (0xbc + sizeof(__le32))];
+        u8      reserved6[0x1000 - (0xbc + sizeof(__le32))];
         __le32  sis_mailbox[8];                         /* 1000h */
-        u8      reserved6[0x4000 - (0x1000 + (sizeof(__le32) * 8))];
+        u8      reserved7[0x4000 - (0x1000 + (sizeof(__le32) * 8))];
         /*
          * The PQI spec states that the PQI registers should be at
          * offset 0 from the PCIe BAR 0.  However, we can't map
@@ -963,6 +965,11 @@ struct pqi_ctrl_info {
         struct semaphore lun_reset_sem;
 };
 
+enum pqi_ctrl_mode {
+        UNKNOWN,
+        PQI_MODE
+};
+
 /*
  * assume worst case: SATA queue depth of 31 minus 4 internal firmware commands
  */
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index dbc8b40cd8ca..43bfeaca65db 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -153,6 +153,18 @@ static inline bool pqi_is_hba_lunid(u8 *scsi3addr)
         return pqi_scsi3addr_equal(scsi3addr, RAID_CTLR_LUNID);
 }
 
+static inline enum pqi_ctrl_mode pqi_get_ctrl_mode(
+        struct pqi_ctrl_info *ctrl_info)
+{
+        return sis_read_driver_scratch(ctrl_info);
+}
+
+static inline void pqi_save_ctrl_mode(struct pqi_ctrl_info *ctrl_info,
+        enum pqi_ctrl_mode mode)
+{
+        sis_write_driver_scratch(ctrl_info, mode);
+}
+
 #define PQI_RESCAN_WORK_INTERVAL        (10 * HZ)
 
 static inline void pqi_schedule_rescan_worker(struct pqi_ctrl_info *ctrl_info)
@@ -5266,10 +5278,30 @@ out:
         return rc;
 }
 
+static int pqi_kdump_init(struct pqi_ctrl_info *ctrl_info)
+{
+        if (!sis_is_firmware_running(ctrl_info))
+                return -ENXIO;
+
+        if (pqi_get_ctrl_mode(ctrl_info) == PQI_MODE) {
+                sis_disable_msix(ctrl_info);
+                if (pqi_reset(ctrl_info) == 0)
+                        sis_reenable_sis_mode(ctrl_info);
+        }
+
+        return 0;
+}
+
 static int pqi_ctrl_init(struct pqi_ctrl_info *ctrl_info)
 {
         int rc;
 
+        if (reset_devices) {
+                rc = pqi_kdump_init(ctrl_info);
+                if (rc)
+                        return rc;
+        }
+
         /*
          * When the controller comes out of reset, it is always running
          * in legacy SIS mode.  This is so that it can be compatible
@@ -5343,6 +5375,7 @@ static int pqi_ctrl_init(struct pqi_ctrl_info *ctrl_info)
 
         /* From here on, we are running in PQI mode. */
         ctrl_info->pqi_mode_enabled = true;
+        pqi_save_ctrl_mode(ctrl_info, PQI_MODE);
 
         rc = pqi_alloc_admin_queues(ctrl_info);
         if (rc) {
@@ -5879,6 +5912,8 @@ static void __attribute__((unused)) verify_structures(void)
         BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
                 sis_ctrl_to_host_doorbell_clear) != 0xa0);
         BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
+                sis_driver_scratch) != 0xb0);
+        BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
                 sis_firmware_status) != 0xbc);
         BUILD_BUG_ON(offsetof(struct pqi_ctrl_registers,
                 sis_mailbox) != 0x1000);
diff --git a/drivers/scsi/smartpqi/smartpqi_sis.c b/drivers/scsi/smartpqi/smartpqi_sis.c
index 5d416a8aa462..71408f9e8f75 100644
--- a/drivers/scsi/smartpqi/smartpqi_sis.c
+++ b/drivers/scsi/smartpqi/smartpqi_sis.c
@@ -376,6 +376,16 @@ int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info)
         return rc;
 }
 
+void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value)
+{
+        writel(value, &ctrl_info->registers->sis_driver_scratch);
+}
+
+u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info)
+{
+        return readl(&ctrl_info->registers->sis_driver_scratch);
+}
+
 static void __attribute__((unused)) verify_structures(void)
 {
         BUILD_BUG_ON(offsetof(struct sis_base_struct,
diff --git a/drivers/scsi/smartpqi/smartpqi_sis.h b/drivers/scsi/smartpqi/smartpqi_sis.h
index d2ff8d54754b..bd6e7b08338e 100644
--- a/drivers/scsi/smartpqi/smartpqi_sis.h
+++ b/drivers/scsi/smartpqi/smartpqi_sis.h
@@ -28,5 +28,7 @@ void sis_enable_msix(struct pqi_ctrl_info *ctrl_info);
 void sis_disable_msix(struct pqi_ctrl_info *ctrl_info);
 void sis_soft_reset(struct pqi_ctrl_info *ctrl_info);
 int sis_reenable_sis_mode(struct pqi_ctrl_info *ctrl_info);
+void sis_write_driver_scratch(struct pqi_ctrl_info *ctrl_info, u32 value);
+u32 sis_read_driver_scratch(struct pqi_ctrl_info *ctrl_info);
 
 #endif  /* _SMARTPQI_SIS_H */