[SCSI] qla4xxx: IDC implementation for Loopback

Handle IDC Request Notify AEN and post IDC Acknowledgement
while participating in Loopback IDC.

Signed-off-by: Nilesh Javali <nilesh.javali@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

7 files changed, 91 insertions, 1 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_83xx.h b/drivers/scsi/qla4xxx/ql4_83xx.h
index a67926383940..18d86abbf276 100644
--- a/drivers/scsi/qla4xxx/ql4_83xx.h
+++ b/drivers/scsi/qla4xxx/ql4_83xx.h
@@ -259,4 +259,12 @@ struct qla83xx_minidump_entry_pollrdmwr {
         uint32_t data_size;
 };
 
+/* IDC additional information */
+struct qla4_83xx_idc_information {
+        uint32_t request_desc;  /* IDC request descriptor */
+        uint32_t info1; /* IDC additional info */
+        uint32_t info2; /* IDC additional info */
+        uint32_t info3; /* IDC additional info */
+};
+
 #endif
diff --git a/drivers/scsi/qla4xxx/ql4_def.h b/drivers/scsi/qla4xxx/ql4_def.h
index 8e061eaa3167..329d553eae94 100644
--- a/drivers/scsi/qla4xxx/ql4_def.h
+++ b/drivers/scsi/qla4xxx/ql4_def.h
@@ -531,7 +531,7 @@ struct scsi_qla_host {
 #define DPC_RESET_ACTIVE                20 /* 0x00040000 */
 #define DPC_HA_UNRECOVERABLE            21 /* 0x00080000 ISP-82xx only*/
 #define DPC_HA_NEED_QUIESCENT           22 /* 0x00100000 ISP-82xx only*/
-
+#define DPC_POST_IDC_ACK                23 /* 0x00200000 */
 
         struct Scsi_Host *host; /* pointer to host data */
         uint32_t tot_ddbs;
@@ -756,6 +756,7 @@ struct scsi_qla_host {
         struct device_reg_83xx  __iomem *qla4_83xx_reg; /* Base I/O address
                                                            for ISP8324 */
         uint32_t pf_bit;
+        struct qla4_83xx_idc_information idc_info;
 };
 
 struct ql4_task_data {
diff --git a/drivers/scsi/qla4xxx/ql4_fw.h b/drivers/scsi/qla4xxx/ql4_fw.h
index 69a21718f4d0..1c4795020357 100644
--- a/drivers/scsi/qla4xxx/ql4_fw.h
+++ b/drivers/scsi/qla4xxx/ql4_fw.h
@@ -454,6 +454,10 @@ struct qla_flt_region {
 #define MBOX_CMD_GET_CRASH_RECORD               0x0076  /* 4010 only */
 #define MBOX_CMD_GET_CONN_EVENT_LOG             0x0077
 
+#define MBOX_CMD_IDC_ACK                        0x0101
+#define MBOX_CMD_PORT_RESET                     0x0120
+#define MBOX_CMD_SET_PORT_CONFIG                0x0122
+
 /*  Mailbox status definitions */
 #define MBOX_COMPLETION_STATUS                  4
 #define MBOX_STS_BUSY                           0x0007
@@ -490,6 +494,8 @@ struct qla_flt_region {
 #define MBOX_ASTS_IPV6_ND_PREFIX_IGNORED        0x802C
 #define MBOX_ASTS_IPV6_LCL_PREFIX_IGNORED       0x802D
 #define MBOX_ASTS_ICMPV6_ERROR_MSG_RCVD         0x802E
+#define MBOX_ASTS_IDC_COMPLETE                  0x8100
+#define MBOX_ASTS_IDC_NOTIFY                    0x8101
 #define MBOX_ASTS_TXSCVR_INSERTED               0x8130
 #define MBOX_ASTS_TXSCVR_REMOVED                0x8131
 
diff --git a/drivers/scsi/qla4xxx/ql4_glbl.h b/drivers/scsi/qla4xxx/ql4_glbl.h
index 0580f8048f63..3eb5fd957c4a 100644
--- a/drivers/scsi/qla4xxx/ql4_glbl.h
+++ b/drivers/scsi/qla4xxx/ql4_glbl.h
@@ -257,6 +257,7 @@ int qla4_8xxx_mbx_intr_disable(struct scsi_qla_host *ha);
 int qla4_8xxx_mbx_intr_enable(struct scsi_qla_host *ha);
 int qla4_8xxx_set_param(struct scsi_qla_host *ha, int param);
 int qla4_8xxx_update_idc_reg(struct scsi_qla_host *ha);
+int qla4_83xx_post_idc_ack(struct scsi_qla_host *ha);
 
 extern int ql4xextended_error_logging;
 extern int ql4xdontresethba;
diff --git a/drivers/scsi/qla4xxx/ql4_isr.c b/drivers/scsi/qla4xxx/ql4_isr.c
index 50503217b069..15ea81465ce4 100644
--- a/drivers/scsi/qla4xxx/ql4_isr.c
+++ b/drivers/scsi/qla4xxx/ql4_isr.c
@@ -806,6 +806,43 @@ static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
                             " removed\n",  ha->host_no, mbox_sts[0]));
                         break;
 
+                case MBOX_ASTS_IDC_NOTIFY:
+                {
+                        uint32_t opcode;
+                        if (is_qla8032(ha)) {
+                                DEBUG2(ql4_printk(KERN_INFO, ha,
+                                                  "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x\n",
+                                                  ha->host_no, mbox_sts[0],
+                                                  mbox_sts[1], mbox_sts[2],
+                                                  mbox_sts[3], mbox_sts[4]));
+                                opcode = mbox_sts[1] >> 16;
+                                if ((opcode == MBOX_CMD_SET_PORT_CONFIG) ||
+                                    (opcode == MBOX_CMD_PORT_RESET)) {
+                                        set_bit(DPC_POST_IDC_ACK,
+                                                &ha->dpc_flags);
+                                        ha->idc_info.request_desc = mbox_sts[1];
+                                        ha->idc_info.info1 = mbox_sts[2];
+                                        ha->idc_info.info2 = mbox_sts[3];
+                                        ha->idc_info.info3 = mbox_sts[4];
+                                        qla4xxx_wake_dpc(ha);
+                                }
+                        }
+                        break;
+                }
+
+                case MBOX_ASTS_IDC_COMPLETE:
+                        if (is_qla8032(ha)) {
+                                DEBUG2(ql4_printk(KERN_INFO, ha,
+                                                  "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x\n",
+                                                  ha->host_no, mbox_sts[0],
+                                                  mbox_sts[1], mbox_sts[2],
+                                                  mbox_sts[3], mbox_sts[4]));
+                                DEBUG2(ql4_printk(KERN_INFO, ha,
+                                                  "scsi:%ld: AEN %04x IDC Complete notification\n",
+                                                  ha->host_no, mbox_sts[0]));
+                        }
+                        break;
+
                 default:
                         DEBUG2(printk(KERN_WARNING
                                       "scsi%ld: AEN %04x UNKNOWN\n",
diff --git a/drivers/scsi/qla4xxx/ql4_mbx.c b/drivers/scsi/qla4xxx/ql4_mbx.c
index f31e79b6aa6d..0d3d641f891b 100644
--- a/drivers/scsi/qla4xxx/ql4_mbx.c
+++ b/drivers/scsi/qla4xxx/ql4_mbx.c
@@ -1968,3 +1968,36 @@ int qla4_8xxx_set_param(struct scsi_qla_host *ha, int param)
 exit_set_param:
         return status;
 }
+
+/**
+ * qla4_83xx_post_idc_ack - post IDC ACK
+ * @ha: Pointer to host adapter structure.
+ *
+ * Posts IDC ACK for IDC Request Notification AEN.
+ **/
+int qla4_83xx_post_idc_ack(struct scsi_qla_host *ha)
+{
+        uint32_t mbox_cmd[MBOX_REG_COUNT];
+        uint32_t mbox_sts[MBOX_REG_COUNT];
+        int status;
+
+        memset(&mbox_cmd, 0, sizeof(mbox_cmd));
+        memset(&mbox_sts, 0, sizeof(mbox_sts));
+
+        mbox_cmd[0] = MBOX_CMD_IDC_ACK;
+        mbox_cmd[1] = ha->idc_info.request_desc;
+        mbox_cmd[2] = ha->idc_info.info1;
+        mbox_cmd[3] = ha->idc_info.info2;
+        mbox_cmd[4] = ha->idc_info.info3;
+
+        status = qla4xxx_mailbox_command(ha, MBOX_REG_COUNT, MBOX_REG_COUNT,
+                                         mbox_cmd, mbox_sts);
+        if (status == QLA_ERROR)
+                ql4_printk(KERN_ERR, ha, "%s: failed status %04X\n", __func__,
+                           mbox_sts[0]);
+        else
+               DEBUG2(ql4_printk(KERN_INFO, ha, "%s: IDC ACK posted\n",
+                                 __func__));
+
+        return status;
+}
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 97ce44bb1ce9..35546807c9f7 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -3398,6 +3398,10 @@ static void qla4xxx_do_dpc(struct work_struct *work)
                         ql4_printk(KERN_INFO, ha, "HW State: FAILED\n");
                         qla4_8xxx_device_state_handler(ha);
                 }
+
+                if (test_and_clear_bit(DPC_POST_IDC_ACK, &ha->dpc_flags))
+                        qla4_83xx_post_idc_ack(ha);
+
                 if (test_and_clear_bit(DPC_HA_NEED_QUIESCENT, &ha->dpc_flags)) {
                         qla4_8xxx_need_qsnt_handler(ha);
                 }