1 files changed, 33 insertions, 9 deletions

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index b22d13b0c71d..5dc9e8c63fcd 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -129,7 +129,9 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
                                         continue;
                                 if (!r->start ||
                                     pci_claim_resource(dev, idx) < 0) {
-                                        dev_info(&dev->dev, "BAR %d: can't allocate resource\n", idx);
+                                        dev_info(&dev->dev,
+                                                 "can't reserve window %pR\n",
+                                                 r);
                                         /*
                                          * Something is wrong with the region.
                                          * Invalidate the resource to prevent
@@ -144,16 +146,29 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
         }
 }
 
+struct pci_check_idx_range {
+        int start;
+        int end;
+};
+
 static void __init pcibios_allocate_resources(int pass)
 {
         struct pci_dev *dev = NULL;
-        int idx, disabled;
+        int idx, disabled, i;
         u16 command;
         struct resource *r;
 
+        struct pci_check_idx_range idx_range[] = {
+                { PCI_STD_RESOURCES, PCI_STD_RESOURCE_END },
+#ifdef CONFIG_PCI_IOV
+                { PCI_IOV_RESOURCES, PCI_IOV_RESOURCE_END },
+#endif
+        };
+
         for_each_pci_dev(dev) {
                 pci_read_config_word(dev, PCI_COMMAND, &command);
-                for (idx = 0; idx < PCI_ROM_RESOURCE; idx++) {
+                for (i = 0; i < ARRAY_SIZE(idx_range); i++)
+                for (idx = idx_range[i].start; idx <= idx_range[i].end; idx++) {
                         r = &dev->resource[idx];
                         if (r->parent)          /* Already allocated */
                                 continue;
@@ -164,12 +179,12 @@ static void __init pcibios_allocate_resources(int pass)
                         else
                                 disabled = !(command & PCI_COMMAND_MEMORY);
                         if (pass == disabled) {
-                                dev_dbg(&dev->dev, "resource %#08llx-%#08llx (f=%lx, d=%d, p=%d)\n",
-                                        (unsigned long long) r->start,
-                                        (unsigned long long) r->end,
-                                        r->flags, disabled, pass);
+                                dev_dbg(&dev->dev,
+                                        "BAR %d: reserving %pr (d=%d, p=%d)\n",
+                                        idx, r, disabled, pass);
                                 if (pci_claim_resource(dev, idx) < 0) {
-                                        dev_info(&dev->dev, "BAR %d: can't allocate resource\n", idx);
+                                        dev_info(&dev->dev,
+                                                 "can't reserve %pR\n", r);
                                         /* We'll assign a new address later */
                                         r->end -= r->start;
                                         r->start = 0;
@@ -182,7 +197,7 @@ static void __init pcibios_allocate_resources(int pass)
                                 /* Turn the ROM off, leave the resource region,
                                  * but keep it unregistered. */
                                 u32 reg;
-                                dev_dbg(&dev->dev, "disabling ROM\n");
+                                dev_dbg(&dev->dev, "disabling ROM %pR\n", r);
                                 r->flags &= ~IORESOURCE_ROM_ENABLE;
                                 pci_read_config_dword(dev,
                                                 dev->rom_base_reg, &reg);
@@ -282,6 +297,15 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
                 return -EINVAL;
 
         prot = pgprot_val(vma->vm_page_prot);
+
+        /*
+         * Return error if pat is not enabled and write_combine is requested.
+         * Caller can followup with UC MINUS request and add a WC mtrr if there
+         * is a free mtrr slot.
+         */
+        if (!pat_enabled && write_combine)
+                return -EINVAL;
+
         if (pat_enabled && write_combine)
                 prot |= _PAGE_CACHE_WC;
         else if (pat_enabled || boot_cpu_data.x86 > 3)