[PATCH 10/18] x86/mtrr: Avoid ifdeffery with phys_wc_to_mtrr_index()
From: Borislav Petkov
Date: Tue May 26 2015 - 04:30:33 EST
From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>
There is only one user but since we're going to bury MTRR next out of
access to drivers, expose this last piece of API to drivers in a general
fashion only needing io.h for access to helpers.
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
Cc: Toshi Kani <toshi.kani@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Thierry Reding <treding@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Cristian Stoica <cristian.stoica@xxxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Suresh Siddha <sbsiddha@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Antonino Daplas <adaplas@xxxxxxxxx>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>
Cc: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Cc: Ville SyrjÃlà <syrjala@xxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Davidlohr Bueso <dbueso@xxxxxxx>
Link: http://lkml.kernel.org/r/1429722736-4473-1-git-send-email-mcgrof@xxxxxxxxxxxxxxxx
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
---
arch/x86/include/asm/io.h | 3 +++
arch/x86/include/asm/mtrr.h | 5 -----
arch/x86/kernel/cpu/mtrr/main.c | 6 +++---
drivers/gpu/drm/drm_ioctl.c | 14 +-------------
include/linux/io.h | 7 +++++++
5 files changed, 14 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/io.h b/arch/x86/include/asm/io.h
index 4afc05ffa566..a2b97404922d 100644
--- a/arch/x86/include/asm/io.h
+++ b/arch/x86/include/asm/io.h
@@ -339,6 +339,9 @@ extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
#define IO_SPACE_LIMIT 0xffff
#ifdef CONFIG_MTRR
+extern int __must_check arch_phys_wc_index(int handle);
+#define arch_phys_wc_index arch_phys_wc_index
+
extern int __must_check arch_phys_wc_add(unsigned long base,
unsigned long size);
extern void arch_phys_wc_del(int handle);
diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h
index a31759e1edd9..b94f6f64e23d 100644
--- a/arch/x86/include/asm/mtrr.h
+++ b/arch/x86/include/asm/mtrr.h
@@ -48,7 +48,6 @@ 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);
-extern int phys_wc_to_mtrr_index(int handle);
# else
static inline u8 mtrr_type_lookup(u64 addr, u64 end, u8 *uniform)
{
@@ -84,10 +83,6 @@ static inline int mtrr_trim_uncached_memory(unsigned long end_pfn)
static inline void mtrr_centaur_report_mcr(int mcr, u32 lo, u32 hi)
{
}
-static inline int phys_wc_to_mtrr_index(int handle)
-{
- return -1;
-}
#define mtrr_ap_init() do {} while (0)
#define mtrr_bp_init() do {} while (0)
diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 04aceb7e6443..81baf5fee0e1 100644
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -580,7 +580,7 @@ void arch_phys_wc_del(int handle)
EXPORT_SYMBOL(arch_phys_wc_del);
/*
- * phys_wc_to_mtrr_index - translates arch_phys_wc_add's return value
+ * arch_phys_wc_index - translates arch_phys_wc_add's return value
* @handle: Return value from arch_phys_wc_add
*
* This will turn the return value from arch_phys_wc_add into an mtrr
@@ -590,14 +590,14 @@ EXPORT_SYMBOL(arch_phys_wc_del);
* in printk line. Alas there is an illegitimate use in some ancient
* drm ioctls.
*/
-int phys_wc_to_mtrr_index(int handle)
+int arch_phys_wc_index(int handle)
{
if (handle < MTRR_TO_PHYS_WC_OFFSET)
return -1;
else
return handle - MTRR_TO_PHYS_WC_OFFSET;
}
-EXPORT_SYMBOL_GPL(phys_wc_to_mtrr_index);
+EXPORT_SYMBOL_GPL(arch_phys_wc_index);
/*
* HACK ALERT!
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index 266dcd6cdf3b..0a957828b3bd 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -36,9 +36,6 @@
#include <linux/pci.h>
#include <linux/export.h>
-#ifdef CONFIG_X86
-#include <asm/mtrr.h>
-#endif
static int drm_version(struct drm_device *dev, void *data,
struct drm_file *file_priv);
@@ -197,16 +194,7 @@ static int drm_getmap(struct drm_device *dev, void *data,
map->type = r_list->map->type;
map->flags = r_list->map->flags;
map->handle = (void *)(unsigned long) r_list->user_token;
-
-#ifdef CONFIG_X86
- /*
- * There appears to be exactly one user of the mtrr index: dritest.
- * It's easy enough to keep it working on non-PAT systems.
- */
- map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
-#else
- map->mtrr = -1;
-#endif
+ map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
mutex_unlock(&dev->struct_mutex);
diff --git a/include/linux/io.h b/include/linux/io.h
index 986f2bffea1e..04cce4da3685 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -111,6 +111,13 @@ static inline void arch_phys_wc_del(int handle)
}
#define arch_phys_wc_add arch_phys_wc_add
+#ifndef arch_phys_wc_index
+static inline int arch_phys_wc_index(int handle)
+{
+ return -1;
+}
+#define arch_phys_wc_index arch_phys_wc_index
+#endif
#endif
#endif /* _LINUX_IO_H */
--
1.9.0.258.g00eda23
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