[SPARC64] PCI: Size TSB correctly on SUN4V.

Forgot to multiply by 8 * 1024, oops.  Correct the size constant when
the virtual-dma arena is 2GB in size, it should bet 256 not 128.

Finally, log some info about the TSB at probe time.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index 13b611d..902d07c 100644 (file)
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -102,6 +102,7 @@ static void *pci_4v_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr
        first_page = __get_free_pages(GFP_ATOMIC, order);
        if (first_page == 0UL)
                return NULL;
+
        memset((char *)first_page, 0, PAGE_SIZE << order);
 
        pcp = pdev->sysdata;
@@ -805,11 +806,11 @@ static void pbm_register_toplevel_resources(struct pci_controller_info *p,
                                    &pbm->mem_space);
 }
 
-static void probe_existing_entries(struct pci_pbm_info *pbm,
-                                  struct pci_iommu *iommu)
+static unsigned long probe_existing_entries(struct pci_pbm_info *pbm,
+                                           struct pci_iommu *iommu)
 {
        struct pci_iommu_arena *arena = &iommu->arena;
-       unsigned long i;
+       unsigned long i, cnt = 0;
        u32 devhandle;
 
        devhandle = pbm->devhandle;
@@ -819,9 +820,13 @@ static void probe_existing_entries(struct pci_pbm_info *pbm,
                ret = pci_sun4v_iommu_getmap(devhandle,
                                             HV_PCI_TSBID(0, i),
                                             &io_attrs, &ra);
-               if (ret == HV_EOK)
+               if (ret == HV_EOK) {
+                       cnt++;
                        __set_bit(i, arena->map);
+               }
        }
+
+       return cnt;
 }
 
 static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
@@ -853,7 +858,7 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
 
                case 0x80000000:
                        dma_mask |= 0x7fffffff;
-                       tsbsize = 128;
+                       tsbsize = 256;
                        break;
 
                default:
@@ -861,6 +866,8 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
                        prom_halt();
        };
 
+       tsbsize *= (8 * 1024);
+
        num_tsb_entries = tsbsize / sizeof(iopte_t);
 
        dma_offset = vdma[0];
@@ -882,7 +889,10 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
        memset(iommu->arena.map, 0, sz);
        iommu->arena.limit = num_tsb_entries;
 
-       probe_existing_entries(pbm, iommu);
+       sz = probe_existing_entries(pbm, iommu);
+
+       printk("%s: TSB entries [%lu], existing mapings [%lu]\n",
+              pbm->name, num_tsb_entries, sz);
 }
 
 static void pci_sun4v_get_bus_range(struct pci_pbm_info *pbm)