Merge branch 'x86/urgent' into x86/core

Conflicts:
	arch/x86/mach-voyager/voyager_smp.c

5 files changed, 67 insertions, 12 deletions

diff --git a/arch/x86/include/asm/iomap.h b/arch/x86/include/asm/iomap.h
index c1f06289b14..86af26091d6 100644
--- a/arch/x86/include/asm/iomap.h
+++ b/arch/x86/include/asm/iomap.h
@@ -23,6 +23,9 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size);
+
 void *
 iomap_atomic_prot_pfn(unsigned long pfn, enum km_type type, pgprot_t prot);
 
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index ca53224fc56..6c2b1af1692 100644
--- a/arch/x86/mm/iomap_32.c
+++ b/arch/x86/mm/iomap_32.c
@@ -20,6 +20,24 @@
 #include <asm/pat.h>
 #include <linux/module.h>
 
+#ifdef CONFIG_X86_PAE
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+	return 1;
+}
+#else
+int
+is_io_mapping_possible(resource_size_t base, unsigned long size)
+{
+	/* There is no way to map greater than 1 << 32 address without PAE */
+	if (base + size > 0x100000000ULL)
+		return 0;
+
+	return 1;
+}
+#endif
+
 /* Map 'pfn' using fixed map 'type' and protections 'prot'
  */
 void *
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 86497d5f44c..c52f4034c7f 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -940,6 +940,9 @@ asmlinkage void __init xen_start_kernel(void)
 	   possible map and a non-dummy shared_info. */
 	per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
 
+	local_irq_disable();
+	early_boot_irqs_off();
+
 	xen_raw_console_write("mapping kernel into physical memory\n");
 	pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);
 
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 2d797ffe813..6949c2d58f1 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1090,6 +1090,11 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
         dev_priv->mm.gtt_mapping =
 		io_mapping_create_wc(dev->agp->base,
 				     dev->agp->agp_info.aper_size * 1024*1024);
+	if (dev_priv->mm.gtt_mapping == NULL) {
+		ret = -EIO;
+		goto out_rmmap;
+	}
+
 	/* Set up a WC MTRR for non-PAT systems.  This is more common than
 	 * one would think, because the kernel disables PAT on first
 	 * generation Core chips because WC PAT gets overridden by a UC
@@ -1122,7 +1127,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	if (!I915_NEED_GFX_HWS(dev)) {
 		ret = i915_init_phys_hws(dev);
 		if (ret != 0)
-			goto out_rmmap;
+			goto out_iomapfree;
 	}
 
 	/* On the 945G/GM, the chipset reports the MSI capability on the
@@ -1161,6 +1166,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
 
 	return 0;
 
+out_iomapfree:
+	io_mapping_free(dev_priv->mm.gtt_mapping);
 out_rmmap:
 	iounmap(dev_priv->regs);
 free_priv:
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
index 82df31726a5..cbc2f0cd631 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -30,11 +30,14 @@
  * See Documentation/io_mapping.txt
  */
 
-/* this struct isn't actually defined anywhere */
-struct io_mapping;
-
 #ifdef CONFIG_HAVE_ATOMIC_IOMAP
 
+struct io_mapping {
+	resource_size_t base;
+	unsigned long size;
+	pgprot_t prot;
+};
+
 /*
  * For small address space machines, mapping large objects
  * into the kernel virtual space isn't practical. Where
@@ -43,23 +46,40 @@ struct io_mapping;
  */
 
 static inline struct io_mapping *
-io_mapping_create_wc(unsigned long base, unsigned long size)
+io_mapping_create_wc(resource_size_t base, unsigned long size)
 {
-	return (struct io_mapping *) base;
+	struct io_mapping *iomap;
+
+	if (!is_io_mapping_possible(base, size))
+		return NULL;
+
+	iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
+	if (!iomap)
+		return NULL;
+
+	iomap->base = base;
+	iomap->size = size;
+	iomap->prot = pgprot_writecombine(__pgprot(__PAGE_KERNEL));
+	return iomap;
 }
 
 static inline void
 io_mapping_free(struct io_mapping *mapping)
 {
+	kfree(mapping);
 }
 
 /* Atomic map/unmap */
 static inline void *
 io_mapping_map_atomic_wc(struct io_mapping *mapping, unsigned long offset)
 {
-	offset += (unsigned long) mapping;
-	return iomap_atomic_prot_pfn(offset >> PAGE_SHIFT, KM_USER0,
-				     __pgprot(__PAGE_KERNEL_WC));
+	resource_size_t phys_addr;
+	unsigned long pfn;
+
+	BUG_ON(offset >= mapping->size);
+	phys_addr = mapping->base + offset;
+	pfn = (unsigned long) (phys_addr >> PAGE_SHIFT);
+	return iomap_atomic_prot_pfn(pfn, KM_USER0, mapping->prot);
 }
 
 static inline void
@@ -71,8 +91,9 @@ io_mapping_unmap_atomic(void *vaddr)
 static inline void *
 io_mapping_map_wc(struct io_mapping *mapping, unsigned long offset)
 {
-	offset += (unsigned long) mapping;
-	return ioremap_wc(offset, PAGE_SIZE);
+	BUG_ON(offset >= mapping->size);
+	resource_size_t phys_addr = mapping->base + offset;
+	return ioremap_wc(phys_addr, PAGE_SIZE);
 }
 
 static inline void
@@ -83,9 +104,12 @@ io_mapping_unmap(void *vaddr)
 
 #else
 
+/* this struct isn't actually defined anywhere */
+struct io_mapping;
+
 /* Create the io_mapping object*/
 static inline struct io_mapping *
-io_mapping_create_wc(unsigned long base, unsigned long size)
+io_mapping_create_wc(resource_size_t base, unsigned long size)
 {
 	return (struct io_mapping *) ioremap_wc(base, size);
 }