lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

gpu/drm, x86, PAT: io_mapping_create_wc and resource_size_t

Browse Source 
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>
This commit is contained in:
Venkatesh Pallipadi
2009-02-24 17:35:12 -08:00
committed by Ingo Molnar
parent 6644107d57
commit 4ab0d47d0a
3 changed files with 56 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
arch/x86/mm/iomap_32.c
View File

@@ -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 *