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[3/4] powerpc/powernv: Unfreeze PE on allocation

Message ID 1474460130-8316-4-git-send-email-gwshan@linux.vnet.ibm.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Gavin Shan Sept. 21, 2016, 12:15 p.m. UTC 
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>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index c38a6a1..5122257 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -126,9 +126,21 @@  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];
 }