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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2009-02-25 04:35:12 +0300
committerIngo Molnar <mingo@elte.hu>2009-02-25 15:09:51 +0300
commit4ab0d47d0ab311eb181532c1ecb6d02905685071 (patch)
tree48b1a6cc01b65bab1442e05a971220366f998976 /arch/x86/mm/iomap_32.c
parent6644107d57a8fa82b47e4c55da4d9d91a612f29c (diff)
downloadlinux-4ab0d47d0ab311eb181532c1ecb6d02905685071.tar.xz
gpu/drm, x86, PAT: io_mapping_create_wc and resource_size_t
io_mapping_create_wc should take a resource_size_t parameter in place of unsigned long. With unsigned long, there will be no way to map greater than 4GB address in i386/32 bit. On x86, greater than 4GB addresses cannot be mapped on i386 without PAE. Return error for such a case. Patch also adds a structure for io_mapping, that saves the base, size and type on HAVE_ATOMIC_IOMAP archs, that can be used to verify the offset on io_mapping_map calls. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Dave Airlie <airlied@redhat.com> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Cc: Eric Anholt <eric@anholt.net> Cc: Keith Packard <keithp@keithp.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/iomap_32.c')
-rw-r--r--arch/x86/mm/iomap_32.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/mm/iomap_32.c b/arch/x86/mm/iomap_32.c
index ca53224fc56c..6c2b1af16926 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 *