RE: [PATCH 2/2] fusion: Implement generic interrupt misroute handling

["Moore, Eric" <Eric.Moore@xxxxxxx>]

Thanks, I will try this out.   However I thought I saw lost interrupts occurring randomly, meaning it was not necessarily the first config page access.  I'm back in the office on 8/11, I will test it out then and provide feedback.

Eric

________________________________________
From: James Bottomley [James.Bottomley@xxxxxxxxxxxxxxxxxxxxx]
Sent: Sunday, August 03, 2008 12:05 PM
To: linux-scsi; linux-kernel; linux-pci@xxxxxxxxxxxxxxx
Cc: Moore, Eric
Subject: [PATCH 2/2] fusion:  Implement generic interrupt misroute handling

This patch uses the new pci_lost_interrupt() callback to note the loss
of an interrupt, and if the reason is MSI, to work around the problem.

I used the manufacturer config page for this, because every fusion type
has that one and its loss means that mpt_config() which is interrupt
driven, failed.

James

---
diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index d6a0074..2d75c58 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -168,7 +168,7 @@ static int  mpt_readScsiDevicePageHeaders(MPT_ADAPTER *ioc, int portnum);
 static void    mpt_read_ioc_pg_1(MPT_ADAPTER *ioc);
 static void    mpt_read_ioc_pg_4(MPT_ADAPTER *ioc);
 static void    mpt_timer_expired(unsigned long data);
-static void    mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc);
+static int     mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc);
 static int     SendEventNotification(MPT_ADAPTER *ioc, u8 EvSwitch);
 static int     SendEventAck(MPT_ADAPTER *ioc, EventNotificationReply_t *evnp);
 static int     mpt_host_page_access_control(MPT_ADAPTER *ioc, u8 access_control_value, int sleepFlag);
@@ -2052,6 +2052,7 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
        int      irq_allocated = 0;
        u8      *a;

+ retry:
        printk(MYIOC_s_INFO_FMT "Initiating %s\n", ioc->name,
            reason == MPT_HOSTEVENT_IOC_BRINGUP ? "bringup" : "recovery");

@@ -2268,6 +2269,7 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
         *      and we try GetLanConfigPages again...
         */
        if ((ret == 0) && (reason == MPT_HOSTEVENT_IOC_BRINGUP)) {
+               int rc;

                /*
                 * Initalize link list for inactive raid volumes.
@@ -2275,6 +2277,22 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
                mutex_init(&ioc->raid_data.inactive_list_mutex);
                INIT_LIST_HEAD(&ioc->raid_data.inactive_list);

+               /* May fail becuase of IRQ misrouting */
+               rc = mpt_get_manufacturing_pg_0(ioc);
+               if (rc) {
+                       if (pci_lost_interrupt(ioc->pcidev) ==
+                           PCI_LOST_IRQ_DISABLE_MSI) {
+                               free_irq(ioc->pci_irq, ioc);
+                               ioc->msi_enable = 0;
+                               pci_disable_msi(ioc->pcidev);
+                               goto retry;
+                       }
+                       printk(MYIOC_s_ERR_FMT "Cannot recover IRQ routing\n",
+                              ioc->name);
+                       return -1;
+               }
+
+
                if (ioc->bus_type == SAS) {

                        /* clear persistency table */
@@ -2326,7 +2344,6 @@ mpt_do_ioc_recovery(MPT_ADAPTER *ioc, u32 reason, int sleepFlag)
                }

                GetIoUnitPage2(ioc);
-               mpt_get_manufacturing_pg_0(ioc);
        }

        /*
@@ -5697,13 +5714,14 @@ mpt_read_ioc_pg_1(MPT_ADAPTER *ioc)
        return;
 }

-static void
+static int
 mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc)
 {
        CONFIGPARMS             cfg;
        ConfigPageHeader_t      hdr;
        dma_addr_t              buf_dma;
        ManufacturingPage0_t    *pbuf = NULL;
+       int                     ret;

        memset(&cfg, 0 , sizeof(CONFIGPARMS));
        memset(&hdr, 0 , sizeof(ConfigPageHeader_t));
@@ -5714,20 +5732,23 @@ mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc)
        cfg.action = MPI_CONFIG_ACTION_PAGE_HEADER;
        cfg.timeout = 10;

-       if (mpt_config(ioc, &cfg) != 0)
+       ret = mpt_config(ioc, &cfg);
+       if (ret != 0)
                goto out;

        if (!cfg.cfghdr.hdr->PageLength)
                goto out;

        cfg.action = MPI_CONFIG_ACTION_PAGE_READ_CURRENT;
+       ret = -ENOMEM;
        pbuf = pci_alloc_consistent(ioc->pcidev, hdr.PageLength * 4, &buf_dma);
        if (!pbuf)
                goto out;

        cfg.physAddr = buf_dma;

-       if (mpt_config(ioc, &cfg) != 0)
+       ret = mpt_config(ioc, &cfg);
+       if (ret != 0)
                goto out;

        memcpy(ioc->board_name, pbuf->BoardName, sizeof(ioc->board_name));
@@ -5738,6 +5759,7 @@ mpt_get_manufacturing_pg_0(MPT_ADAPTER *ioc)

        if (pbuf)
                pci_free_consistent(ioc->pcidev, hdr.PageLength * 4, pbuf, buf_dma);
+       return ret;
 }

 /*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/


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