cxl: Route eeh events to all slices for pci_channel_io_perm_failure state

Fix a boundary condition where in some cases an eeh event with state ==
pci_channel_io_perm_failure wont be passed on to a driver attached to
the virtual PCI device associated with a slice. This will happen in case
the slice just before (n-1) doesn't have any vPHB bus associated with
it, that results in an early return from cxl_pci_error_detected()
callback.

With state == pci_channel_io_perm_failure, the adapter will be removed
irrespective of the return value of cxl_vphb_error_detected(). So we now
always return PCI_ERS_RESULT_DISCONNECTED for this case i.e even if
the AFU isn't using a vPHB (currently returns PCI_ERS_RESULT_NONE).

Fixes: e4f5fc001a6("cxl: Do not create vPHB if there are no AFU configuration records")
Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Reviewed-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 91f645992c94..b27ea98b781f 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -1792,15 +1792,14 @@ static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev,
 
         /* If we're permanently dead, give up. */
         if (state == pci_channel_io_perm_failure) {
-                /* Tell the AFU drivers; but we don't care what they
-                 * say, we're going away.
-                 */
                 for (i = 0; i < adapter->slices; i++) {
                         afu = adapter->afu[i];
-                        /* Only participate in EEH if we are on a virtual PHB */
-                        if (afu->phb == NULL)
-                                return PCI_ERS_RESULT_NONE;
-                        cxl_vphb_error_detected(afu, state);
+                        /*
+                         * Tell the AFU drivers; but we don't care what they
+                         * say, we're going away.
+                         */
+                        if (afu->phb != NULL)
+                                cxl_vphb_error_detected(afu, state);
                 }
                 return PCI_ERS_RESULT_DISCONNECT;
         }