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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2009-07-10 09:57:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-08-26 15:41:16 -0700
commit9e36fda0b359d2a6ae039c3d7e71a04502a77898 (patch)
treea1a50780b15cf59de22ee4ee87fee6e488a310d3 /include/linux/io-mapping.h
parent9fd126bc742f74a95d2ba610247712ff05da02fe (diff)
downloadop-kernel-dev-9e36fda0b359d2a6ae039c3d7e71a04502a77898.zip
op-kernel-dev-9e36fda0b359d2a6ae039c3d7e71a04502a77898.tar.gz
x86, pat: Add PAT reserve free to io_mapping* APIs
io_mapping_* interfaces were added, mainly for graphics drivers. Make this interface go through the PAT reserve/free, instead of hardcoding WC mapping. This makes sure that there are no aliases due to unconditional WC setting. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'include/linux/io-mapping.h')
-rw-r--r--include/linux/io-mapping.h17
1 files changed, 12 insertions, 5 deletions
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
index 0adb0f9..97eb928 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -49,23 +49,30 @@ static inline struct io_mapping *
io_mapping_create_wc(resource_size_t base, unsigned long size)
{
struct io_mapping *iomap;
-
- if (!is_io_mapping_possible(base, size))
- return NULL;
+ pgprot_t prot;
iomap = kmalloc(sizeof(*iomap), GFP_KERNEL);
if (!iomap)
- return NULL;
+ goto out_err;
+
+ if (iomap_create_wc(base, size, &prot))
+ goto out_free;
iomap->base = base;
iomap->size = size;
- iomap->prot = pgprot_writecombine(__pgprot(__PAGE_KERNEL));
+ iomap->prot = prot;
return iomap;
+
+out_free:
+ kfree(iomap);
+out_err:
+ return NULL;
}
static inline void
io_mapping_free(struct io_mapping *mapping)
{
+ iomap_free(mapping->base, mapping->size);
kfree(mapping);
}
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