powerpc/powernv: Unfreeze PE on allocation

This unfreezes PE when it's initialized because the PE might be put
into frozen state in the last hot remove path. It's not harmful to
do so if the PE is already in unfrozen state.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 748d733187a4374e2c4d836bd2023c2cdb3ed599..fd08a5fc253a57c28da160377005930b9548a721 100644 (file)
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -126,9 +126,22 @@ static inline bool pnv_pci_is_m64(struct pnv_phb *phb, struct resource *r)
 
 static struct pnv_ioda_pe *pnv_ioda_init_pe(struct pnv_phb *phb, int pe_no)
 {
+       s64 rc;
+
        phb->ioda.pe_array[pe_no].phb = phb;
        phb->ioda.pe_array[pe_no].pe_number = pe_no;
 
+       /*
+        * Clear the PE frozen state as it might be put into frozen state
+        * in the last PCI remove path. It's not harmful to do so when the
+        * PE is already in unfrozen state.
+        */
+       rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no,
+                                      OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
+       if (rc != OPAL_SUCCESS)
+               pr_warn("%s: Error %lld unfreezing PHB#%d-PE#%d\n",
+                       __func__, rc, phb->hose->global_number, pe_no);
+
        return &phb->ioda.pe_array[pe_no];
 }