powerpc/powernv/pci: Fallback to OPAL for TCE invalidations

If we don't find registers for the PHB or don't know the model
specific invalidation method, use OPAL calls instead.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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 6203b2f3db403e731d0c75166c1aa3fe95e00103..d7502f2265bc4d87da68226c7f0b08261c8743fc 100644 (file)
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1861,6 +1861,17 @@ static void pnv_pci_phb3_tce_invalidate(struct pnv_ioda_pe *pe, bool rm,
        }
 }
 
+static inline void pnv_pci_ioda2_tce_invalidate_pe(struct pnv_ioda_pe *pe)
+{
+       struct pnv_phb *phb = pe->phb;
+
+       if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
+               pnv_pci_phb3_tce_invalidate_pe(pe);
+       else
+               opal_pci_tce_kill(phb->opal_id, OPAL_PCI_TCE_KILL_PE,
+                                 pe->pe_number, 0, 0, 0);
+}
+
 static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl,
                unsigned long index, unsigned long npages, bool rm)
 {
@@ -1869,17 +1880,31 @@ static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl,
        list_for_each_entry_rcu(tgl, &tbl->it_group_list, next) {
                struct pnv_ioda_pe *pe = container_of(tgl->table_group,
                                struct pnv_ioda_pe, table_group);
-               if (pe->phb->type == PNV_PHB_NPU) {
+               struct pnv_phb *phb = pe->phb;
+               unsigned int shift = tbl->it_page_shift;
+
+               if (phb->type == PNV_PHB_NPU) {
                        /*
                         * The NVLink hardware does not support TCE kill
                         * per TCE entry so we have to invalidate
                         * the entire cache for it.
                         */
-                       pnv_pci_phb3_tce_invalidate_entire(pe->phb, rm);
+                       pnv_pci_phb3_tce_invalidate_entire(phb, rm);
                        continue;
                }
-               pnv_pci_phb3_tce_invalidate(pe, rm, tbl->it_page_shift,
-                                           index, npages);
+               if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs)
+                       pnv_pci_phb3_tce_invalidate(pe, rm, shift,
+                                                   index, npages);
+               else if (rm)
+                       opal_rm_pci_tce_kill(phb->opal_id,
+                                            OPAL_PCI_TCE_KILL_PAGES,
+                                            pe->pe_number, 1u << shift,
+                                            index << shift, npages);
+               else
+                       opal_pci_tce_kill(phb->opal_id,
+                                         OPAL_PCI_TCE_KILL_PAGES,
+                                         pe->pe_number, 1u << shift,
+                                         index << shift, npages);
        }
 }