[SCSI] qla4xxx: Temperature monitoring for ISP82XX core.

During watchdog, need to monitor temperature of ISP82XX core
and set device state to FAILED when temperature reaches
"Panic" level.

Signed-off-by: Mike Hernandez <michael.hernandez@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 58 insertions, 4 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h
index 22a3ff02e48..ec48dc30b9a 100644
--- a/drivers/scsi/qla4xxx/ql4_def.h
+++ b/drivers/scsi/qla4xxx/ql4_def.h
@@ -671,6 +671,7 @@ struct scsi_qla_host {
         uint16_t pri_ddb_idx;
         uint16_t sec_ddb_idx;
         int is_reset;
+        uint16_t temperature;
 };
 
 struct ql4_task_data {
diff --git a/drivers/scsi/qla4xxx/ql4_nx.h b/drivers/scsi/qla4xxx/ql4_nx.h
index 35376a1c3f1..cfb2f2edac3 100644
--- a/drivers/scsi/qla4xxx/ql4_nx.h
+++ b/drivers/scsi/qla4xxx/ql4_nx.h
@@ -19,12 +19,25 @@
 #define PHAN_PEG_RCV_INITIALIZED        0xff01
 
 /*CRB_RELATED*/
-#define QLA82XX_CRB_BASE        QLA82XX_CAM_RAM(0x200)
-#define QLA82XX_REG(X)          (QLA82XX_CRB_BASE+(X))
-
+#define QLA82XX_CRB_BASE                (QLA82XX_CAM_RAM(0x200))
+#define QLA82XX_REG(X)                  (QLA82XX_CRB_BASE+(X))
 #define CRB_CMDPEG_STATE                QLA82XX_REG(0x50)
 #define CRB_RCVPEG_STATE                QLA82XX_REG(0x13c)
 #define CRB_DMA_SHIFT                   QLA82XX_REG(0xcc)
+#define CRB_TEMP_STATE                  QLA82XX_REG(0x1b4)
+
+#define qla82xx_get_temp_val(x)         ((x) >> 16)
+#define qla82xx_get_temp_state(x)       ((x) & 0xffff)
+#define qla82xx_encode_temp(val, state) (((val) << 16) | (state))
+
+/*
+ * Temperature control.
+ */
+enum {
+        QLA82XX_TEMP_NORMAL = 0x1,      /* Normal operating range */
+        QLA82XX_TEMP_WARN,      /* Sound alert, temperature getting high */
+        QLA82XX_TEMP_PANIC      /* Fatal error, hardware has shut down. */
+};
 
 #define QLA82XX_HW_H0_CH_HUB_ADR        0x05
 #define QLA82XX_HW_H1_CH_HUB_ADR        0x0E
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 0048a3facd7..9d3eab51393 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -1972,6 +1972,42 @@ mem_alloc_error_exit:
 }
 
 /**
+ * qla4_8xxx_check_temp - Check the ISP82XX temperature.
+ * @ha: adapter block pointer.
+ *
+ * Note: The caller should not hold the idc lock.
+ **/
+static int qla4_8xxx_check_temp(struct scsi_qla_host *ha)
+{
+        uint32_t temp, temp_state, temp_val;
+        int status = QLA_SUCCESS;
+
+        temp = qla4_8xxx_rd_32(ha, CRB_TEMP_STATE);
+
+        temp_state = qla82xx_get_temp_state(temp);
+        temp_val = qla82xx_get_temp_val(temp);
+
+        if (temp_state == QLA82XX_TEMP_PANIC) {
+                ql4_printk(KERN_WARNING, ha, "Device temperature %d degrees C"
+                           " exceeds maximum allowed. Hardware has been shut"
+                           " down.\n", temp_val);
+                status = QLA_ERROR;
+        } else if (temp_state == QLA82XX_TEMP_WARN) {
+                if (ha->temperature == QLA82XX_TEMP_NORMAL)
+                        ql4_printk(KERN_WARNING, ha, "Device temperature %d"
+                                   " degrees C exceeds operating range."
+                                   " Immediate action needed.\n", temp_val);
+        } else {
+                if (ha->temperature == QLA82XX_TEMP_WARN)
+                        ql4_printk(KERN_INFO, ha, "Device temperature is"
+                                   " now %d degrees C in normal range.\n",
+                                   temp_val);
+        }
+        ha->temperature = temp_state;
+        return status;
+}
+
+/**
  * qla4_8xxx_check_fw_alive  - Check firmware health
  * @ha: Pointer to host adapter structure.
  *
@@ -2042,7 +2078,11 @@ void qla4_8xxx_watchdog(struct scsi_qla_host *ha)
             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
             test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags))) {
                 dev_state = qla4_8xxx_rd_32(ha, QLA82XX_CRB_DEV_STATE);
-                if (dev_state == QLA82XX_DEV_NEED_RESET &&
+
+                if (qla4_8xxx_check_temp(ha)) {
+                        set_bit(DPC_HA_UNRECOVERABLE, &ha->dpc_flags);
+                        qla4xxx_wake_dpc(ha);
+                } else if (dev_state == QLA82XX_DEV_NEED_RESET &&
                     !test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
                         if (!ql4xdontresethba) {
                                 ql4_printk(KERN_INFO, ha, "%s: HW State: "