3 files changed, 39 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c
index b63b2834133f..b275c7df0186 100644
--- a/arch/sparc64/kernel/pci_sun4v.c
+++ b/arch/sparc64/kernel/pci_sun4v.c
@@ -988,8 +988,13 @@ static unsigned long probe_existing_entries(struct pci_pbm_info *pbm,
                                              HV_PCI_TSBID(0, i),
                                              &io_attrs, &ra);
                 if (ret == HV_EOK) {
-                        cnt++;
-                        __set_bit(i, arena->map);
+                        if (page_in_phys_avail(ra)) {
+                                pci_sun4v_iommu_demap(devhandle,
+                                                      HV_PCI_TSBID(0, i), 1);
+                        } else {
+                                cnt++;
+                                __set_bit(i, arena->map);
+                        }
                 }
         }
 
@@ -1062,9 +1067,9 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
         iommu->arena.limit = num_tsb_entries;
 
         sz = probe_existing_entries(pbm, iommu);
-
-        printk("%s: TSB entries [%lu], existing mapings [%lu]\n",
-               pbm->name, num_tsb_entries, sz);
+        if (sz)
+                printk("%s: Imported %lu TSB entries from OBP\n",
+                       pbm->name, sz);
 }
 
 static void pci_sun4v_get_bus_range(struct pci_pbm_info *pbm)
diff --git a/arch/sparc64/mm/init.c b/arch/sparc64/mm/init.c
index 9d2b0da590af..513993414747 100644
--- a/arch/sparc64/mm/init.c
+++ b/arch/sparc64/mm/init.c
@@ -1396,7 +1396,7 @@ static void __init taint_real_pages(void)
                 while (old_start < old_end) {
                         int n;
 
-                        for (n = 0; pavail_rescan_ents; n++) {
+                        for (n = 0; n < pavail_rescan_ents; n++) {
                                 unsigned long new_start, new_end;
 
                                 new_start = pavail_rescan[n].phys_addr;
@@ -1418,6 +1418,32 @@ static void __init taint_real_pages(void)
         }
 }
 
+int __init page_in_phys_avail(unsigned long paddr)
+{
+        int i;
+
+        paddr &= PAGE_MASK;
+
+        for (i = 0; i < pavail_rescan_ents; i++) {
+                unsigned long start, end;
+
+                start = pavail_rescan[i].phys_addr;
+                end = start + pavail_rescan[i].reg_size;
+
+                if (paddr >= start && paddr < end)
+                        return 1;
+        }
+        if (paddr >= kern_base && paddr < (kern_base + kern_size))
+                return 1;
+#ifdef CONFIG_BLK_DEV_INITRD
+        if (paddr >= __pa(initrd_start) &&
+            paddr < __pa(PAGE_ALIGN(initrd_end)))
+                return 1;
+#endif
+
+        return 0;
+}
+
 void __init mem_init(void)
 {
         unsigned long codepages, datapages, initpages;
diff --git a/include/asm-sparc64/pgtable.h b/include/asm-sparc64/pgtable.h
index 4e218814bb3c..03f5bc9b6bec 100644
--- a/include/asm-sparc64/pgtable.h
+++ b/include/asm-sparc64/pgtable.h
@@ -756,6 +756,8 @@ extern unsigned long *sparc64_valid_addr_bitmap;
 #define kern_addr_valid(addr)   \
         (test_bit(__pa((unsigned long)(addr))>>22, sparc64_valid_addr_bitmap))
 
+extern int page_in_phys_avail(unsigned long paddr);
+
 extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
                                unsigned long pfn,
                                unsigned long size, pgprot_t prot);