[SCSI] qla2xxx: Handle MPI timeout indicated by AE8002

In case the MPI times out, the FW issues an async event AE8002
to indicate this to every FCoE function. The FC/FCoE driver is
required to handle this, by doing a soft reset and issuing a
Write MPI register mailbox command to reset the MPI.

Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

5 files changed, 107 insertions, 1 deletions

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index 3a432ea0c7a3..ee15f4f10fec 100644
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -706,6 +706,11 @@ typedef struct {
 #define MBC_SET_PORT_CONFIG             0x122   /* Set port configuration */
 #define MBC_GET_PORT_CONFIG             0x123   /* Get port configuration */
 
+/*
+ * ISP81xx mailbox commands
+ */
+#define MBC_WRITE_MPI_REGISTER          0x01    /* Write MPI Register. */
+
 /* Firmware return data sizes */
 #define FCAL_MAP_SIZE   128
 
@@ -2858,6 +2863,7 @@ typedef struct scsi_qla_host {
 #define NPIV_CONFIG_NEEDED      16
 #define ISP_UNRECOVERABLE       17
 #define FCOE_CTX_RESET_NEEDED   18      /* Initiate FCoE context reset */
+#define MPI_RESET_NEEDED        19      /* Initiate MPI FW reset */
 
         uint32_t        device_flags;
 #define SWITCH_FOUND            BIT_0
diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h
index 967bc9278bf7..c33dec827e1e 100644
--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -352,6 +352,8 @@ qla2x00_read_ram_word(scsi_qla_host_t *, uint32_t, uint32_t *);
 extern int
 qla2x00_write_ram_word(scsi_qla_host_t *, uint32_t, uint32_t);
 
+extern int
+qla81xx_write_mpi_register(scsi_qla_host_t *, uint16_t *);
 extern int qla2x00_get_data_rate(scsi_qla_host_t *);
 extern int qla24xx_set_fcp_prio(scsi_qla_host_t *, uint16_t, uint16_t,
         uint16_t *);
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index f2da5c5dacdd..c2d7bb8cd53f 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -944,6 +944,19 @@ qla2x00_reset_chip(scsi_qla_host_t *vha)
 }
 
 /**
+ * qla81xx_reset_mpi() - Reset's MPI FW via Write MPI Register MBC.
+ *
+ * Returns 0 on success.
+ */
+int
+qla81xx_reset_mpi(scsi_qla_host_t *vha)
+{
+        uint16_t mb[4] = {0x1010, 0, 1, 0};
+
+        return qla81xx_write_mpi_register(vha, mb);
+}
+
+/**
  * qla24xx_reset_risc() - Perform full reset of ISP24xx RISC.
  * @ha: HA context
  *
@@ -957,6 +970,7 @@ qla24xx_reset_risc(scsi_qla_host_t *vha)
         struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
         uint32_t cnt, d2;
         uint16_t wd;
+        static int abts_cnt; /* ISP abort retry counts */
 
         spin_lock_irqsave(&ha->hardware_lock, flags);
 
@@ -990,6 +1004,23 @@ qla24xx_reset_risc(scsi_qla_host_t *vha)
                 barrier();
         }
 
+        /* If required, do an MPI FW reset now */
+        if (test_and_clear_bit(MPI_RESET_NEEDED, &vha->dpc_flags)) {
+                if (qla81xx_reset_mpi(vha) != QLA_SUCCESS) {
+                        if (++abts_cnt < 5) {
+                                set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
+                                set_bit(MPI_RESET_NEEDED, &vha->dpc_flags);
+                        } else {
+                                /*
+                                 * We exhausted the ISP abort retries. We have to
+                                 * set the board offline.
+                                 */
+                                abts_cnt = 0;
+                                vha->flags.online = 0;
+                        }
+                }
+        }
+
         WRT_REG_DWORD(&reg->hccr, HCCRX_SET_RISC_RESET);
         RD_REG_DWORD(&reg->hccr);
 
diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 6982ba70e12a..bb4d63a792aa 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -412,8 +412,14 @@ skip_rio:
                                     "Unrecoverable Hardware Error: adapter "
                                     "marked OFFLINE!\n");
                                 vha->flags.online = 0;
-                        } else
+                        } else {
+                                /* Check to see if MPI timeout occured */
+                                if ((mbx & MBX_3) && (ha->flags.port0))
+                                        set_bit(MPI_RESET_NEEDED,
+                                            &vha->dpc_flags);
+
                                 set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
+                        }
                 } else if (mb[1] == 0) {
                         qla_printk(KERN_INFO, ha,
                             "Unrecoverable Hardware Error: adapter marked "
diff --git a/drivers/scsi/qla2xxx/qla_mbx.c b/drivers/scsi/qla2xxx/qla_mbx.c
index d0413d56887c..52024080c393 100644
--- a/drivers/scsi/qla2xxx/qla_mbx.c
+++ b/drivers/scsi/qla2xxx/qla_mbx.c
@@ -3949,6 +3949,67 @@ qla2x00_write_ram_word(scsi_qla_host_t *vha, uint32_t risc_addr, uint32_t data)
 }
 
 int
+qla81xx_write_mpi_register(scsi_qla_host_t *vha, uint16_t *mb)
+{
+        int rval;
+        uint32_t stat, timer;
+        uint16_t mb0 = 0;
+        struct qla_hw_data *ha = vha->hw;
+        struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
+
+        rval = QLA_SUCCESS;
+
+        DEBUG11(qla_printk(KERN_INFO, ha,
+            "%s(%ld): entered.\n", __func__, vha->host_no));
+
+        clear_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags);
+
+        /* Write the MBC data to the registers */
+        WRT_REG_WORD(&reg->mailbox0, MBC_WRITE_MPI_REGISTER);
+        WRT_REG_WORD(&reg->mailbox1, mb[0]);
+        WRT_REG_WORD(&reg->mailbox2, mb[1]);
+        WRT_REG_WORD(&reg->mailbox3, mb[2]);
+        WRT_REG_WORD(&reg->mailbox4, mb[3]);
+
+        WRT_REG_DWORD(&reg->hccr, HCCRX_SET_HOST_INT);
+
+        /* Poll for MBC interrupt */
+        for (timer = 6000000; timer; timer--) {
+                /* Check for pending interrupts. */
+                stat = RD_REG_DWORD(&reg->host_status);
+                if (stat & HSRX_RISC_INT) {
+                        stat &= 0xff;
+
+                        if (stat == 0x1 || stat == 0x2 ||
+                            stat == 0x10 || stat == 0x11) {
+                                set_bit(MBX_INTERRUPT,
+                                    &ha->mbx_cmd_flags);
+                                mb0 = RD_REG_WORD(&reg->mailbox0);
+                                WRT_REG_DWORD(&reg->hccr,
+                                    HCCRX_CLR_RISC_INT);
+                                RD_REG_DWORD(&reg->hccr);
+                                break;
+                        }
+                }
+                udelay(5);
+        }
+
+        if (test_and_clear_bit(MBX_INTERRUPT, &ha->mbx_cmd_flags))
+                rval = mb0 & MBS_MASK;
+        else
+                rval = QLA_FUNCTION_FAILED;
+
+        if (rval != QLA_SUCCESS) {
+                DEBUG2_3_11(printk(KERN_INFO "%s(%ld): failed=%x mb[0]=%x.\n",
+                    __func__, vha->host_no, rval, mb[0]));
+        } else {
+                DEBUG11(printk(KERN_INFO
+                    "%s(%ld): done.\n", __func__, vha->host_no));
+        }
+
+        return rval;
+}
+int
 qla2x00_get_data_rate(scsi_qla_host_t *vha)
 {
         int rval;