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-rw-r--r--arch/x86/include/asm/cacheflush.h54
-rw-r--r--arch/x86/include/asm/iomap.h9
-rw-r--r--arch/x86/include/asm/mtrr.h6
-rw-r--r--arch/x86/include/asm/pat.h5
4 files changed, 69 insertions, 5 deletions
diff --git a/arch/x86/include/asm/cacheflush.h b/arch/x86/include/asm/cacheflush.h
index e55dfc1ad45..b54f6afe7ec 100644
--- a/arch/x86/include/asm/cacheflush.h
+++ b/arch/x86/include/asm/cacheflush.h
@@ -43,8 +43,58 @@ static inline void copy_from_user_page(struct vm_area_struct *vma,
memcpy(dst, src, len);
}
-#define PG_non_WB PG_arch_1
-PAGEFLAG(NonWB, non_WB)
+#define PG_WC PG_arch_1
+PAGEFLAG(WC, WC)
+
+#ifdef CONFIG_X86_PAT
+/*
+ * X86 PAT uses page flags WC and Uncached together to keep track of
+ * memory type of pages that have backing page struct. X86 PAT supports 3
+ * different memory types, _PAGE_CACHE_WB, _PAGE_CACHE_WC and
+ * _PAGE_CACHE_UC_MINUS and fourth state where page's memory type has not
+ * been changed from its default (value of -1 used to denote this).
+ * Note we do not support _PAGE_CACHE_UC here.
+ *
+ * Caller must hold memtype_lock for atomicity.
+ */
+static inline unsigned long get_page_memtype(struct page *pg)
+{
+ if (!PageUncached(pg) && !PageWC(pg))
+ return -1;
+ else if (!PageUncached(pg) && PageWC(pg))
+ return _PAGE_CACHE_WC;
+ else if (PageUncached(pg) && !PageWC(pg))
+ return _PAGE_CACHE_UC_MINUS;
+ else
+ return _PAGE_CACHE_WB;
+}
+
+static inline void set_page_memtype(struct page *pg, unsigned long memtype)
+{
+ switch (memtype) {
+ case _PAGE_CACHE_WC:
+ ClearPageUncached(pg);
+ SetPageWC(pg);
+ break;
+ case _PAGE_CACHE_UC_MINUS:
+ SetPageUncached(pg);
+ ClearPageWC(pg);
+ break;
+ case _PAGE_CACHE_WB:
+ SetPageUncached(pg);
+ SetPageWC(pg);
+ break;
+ default:
+ case -1:
+ ClearPageUncached(pg);
+ ClearPageWC(pg);
+ break;
+ }
+}
+#else
+static inline unsigned long get_page_memtype(struct page *pg) { return -1; }
+static inline void set_page_memtype(struct page *pg, unsigned long memtype) { }
+#endif
/*
* The set_memory_* API can be used to change various attributes of a virtual
diff --git a/arch/x86/include/asm/iomap.h b/arch/x86/include/asm/iomap.h
index 0e9fe1d9d97..f35eb45d657 100644
--- a/arch/x86/include/asm/iomap.h
+++ b/arch/x86/include/asm/iomap.h
@@ -26,13 +26,16 @@
#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);
void
iounmap_atomic(void *kvaddr, enum km_type type);
+int
+iomap_create_wc(resource_size_t base, unsigned long size, pgprot_t *prot);
+
+void
+iomap_free(resource_size_t base, unsigned long size);
+
#endif /* _ASM_X86_IOMAP_H */
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index a51ada8467d..4365ffdb461 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -121,6 +121,9 @@ extern int mtrr_del_page(int reg, unsigned long base, unsigned long size);
extern void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi);
extern void mtrr_ap_init(void);
extern void mtrr_bp_init(void);
+extern void set_mtrr_aps_delayed_init(void);
+extern void mtrr_aps_init(void);
+extern void mtrr_bp_restore(void);
extern int mtrr_trim_uncached_memory(unsigned long end_pfn);
extern int amd_special_default_mtrr(void);
# else
@@ -161,6 +164,9 @@ static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
#define mtrr_ap_init() do {} while (0)
#define mtrr_bp_init() do {} while (0)
+#define set_mtrr_aps_delayed_init() do {} while (0)
+#define mtrr_aps_init() do {} while (0)
+#define mtrr_bp_restore() do {} while (0)
# endif
#ifdef CONFIG_COMPAT
diff --git a/arch/x86/include/asm/pat.h b/arch/x86/include/asm/pat.h
index 7af14e512f9..e2c1668dde7 100644
--- a/arch/x86/include/asm/pat.h
+++ b/arch/x86/include/asm/pat.h
@@ -19,4 +19,9 @@ extern int free_memtype(u64 start, u64 end);
extern int kernel_map_sync_memtype(u64 base, unsigned long size,
unsigned long flag);
+int io_reserve_memtype(resource_size_t start, resource_size_t end,
+ unsigned long *type);
+
+void io_free_memtype(resource_size_t start, resource_size_t end);
+
#endif /* _ASM_X86_PAT_H */