[SCSI] mpt2sas: driver fails to recover from injected PCIe bus errors

fixes surrounding PCIe enhanced error handling:

(1) We need to reject all request generated internaly inside the driver as well
as request arriving from the scsi mid layer when PCIe EEH is active. The fix is
to add a per adapter flag called pci_error_recovery which is checked thru out
the driver when request are generated.

(2) We don't need to call the pci_driver->remove directly from the PCIe
callbacks becuase its already called from the PCIe EEH code. In its place we are
shutting down the watchdog timer, and flushing back all pending IO.

(3) We need to save and restore the pci state across PCIe EEH handling.

Signed-off-by: Eric Moore <eric.moore@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.c b/drivers/scsi/mpt2sas/mpt2sas_base.c
index 1f22a764927a..57bcd5c9dcff 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1311,6 +1311,9 @@ mpt2sas_base_map_resources(struct MPT2SAS_ADAPTER *ioc)
         printk(MPT2SAS_INFO_FMT "ioport(0x%016llx), size(%d)\n",
             ioc->name, (unsigned long long)pio_chip, pio_sz);
 
+        /* Save PCI configuration state for recovery from PCI AER/EEH errors */
+        pci_save_state(pdev);
+
         return 0;
 
  out_fail:
@@ -3407,6 +3410,9 @@ _base_make_ioc_ready(struct MPT2SAS_ADAPTER *ioc, int sleep_flag,
         dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "%s\n", ioc->name,
             __func__));
 
+        if (ioc->pci_error_recovery)
+                return 0;
+
         ioc_state = mpt2sas_base_get_iocstate(ioc, 0);
         dhsprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: ioc_state(0x%08x)\n",
             ioc->name, __func__, ioc_state));
@@ -3869,6 +3875,13 @@ mpt2sas_base_hard_reset_handler(struct MPT2SAS_ADAPTER *ioc, int sleep_flag,
         dtmprintk(ioc, printk(MPT2SAS_INFO_FMT "%s: enter\n", ioc->name,
             __func__));
 
+        if (ioc->pci_error_recovery) {
+                printk(MPT2SAS_ERR_FMT "%s: pci error recovery reset\n",
+                    ioc->name, __func__);
+                r = 0;
+                goto out;
+        }
+
         if (mpt2sas_fwfault_debug)
                 mpt2sas_halt_firmware(ioc);