The patch titled
mtrr: implement mtrr_save_fixed_ranges()
has been added to the -mm tree. Its filename is
mtrr-implement-mtrr_save_fixed_ranges.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: mtrr: implement mtrr_save_fixed_ranges()
From: Bernhard Kaindl <bk@xxxxxxx>
This patch implements mtrr_save_fixed_ranges() which can be called from
anywhere anytime to retrieve the fixed-range MTRRs from the current CPU and
saves these MTRR values to the MTRR state struct.
This function calls get_fixed_ranges(), passing mtrr_state.fixed_ranges which
is the element of the static struct which stores our current backup of the
fixed-range MTRR values which all CPUs shall be using.
Because mtrr_save_fixed_ranges calls get_fixed_ranges() after kernel
initialisation time, __init needs to be removed from the declaration of
get_fixed_ranges().
Signed-off-by: Bernhard Kaindl <bk@xxxxxxx>
Cc: Dave Jones <davej@xxxxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/cpu/mtrr/generic.c | 20 +++++++++++++++++---
include/asm-i386/mtrr.h | 2 ++
include/asm-x86_64/proto.h | 2 ++
3 files changed, 21 insertions(+), 3 deletions(-)
diff -puN arch/i386/kernel/cpu/mtrr/generic.c~mtrr-implement-mtrr_save_fixed_ranges arch/i386/kernel/cpu/mtrr/generic.c
--- a/arch/i386/kernel/cpu/mtrr/generic.c~mtrr-implement-mtrr_save_fixed_ranges
+++ a/arch/i386/kernel/cpu/mtrr/generic.c
@@ -29,8 +29,11 @@ static struct mtrr_state mtrr_state = {}
static int mtrr_show;
module_param_named(show, mtrr_show, bool, 0);
-/* Get the MSR pair relating to a var range */
-static void __cpuinit
+/**
+ * Retrieves the current fixed-range MTRRs from the current CPU
+ * \param frs address where to write the current MTRR contents
+ */
+static void
get_mtrr_var_range(unsigned int index, struct mtrr_var_range *vr)
{
rdmsr(MTRRphysBase_MSR(index), vr->base_lo, vr->base_hi);
@@ -51,7 +54,18 @@ get_fixed_ranges(mtrr_type * frs)
rdmsr(MTRRfix4K_C0000_MSR + i, p[6 + i * 2], p[7 + i * 2]);
}
-static void __cpuinit print_fixed(unsigned base, unsigned step, const mtrr_type*types)
+/**
+ * Updates our copy of the state of the fixed-range MTRR values
+ * with the current fixed-range MTRR contents from the current CPU
+ * \param info dummy needed for use by smp_call_function_single()
+ */
+void mtrr_save_fixed_ranges(void *info)
+{
+ get_fixed_ranges(mtrr_state.fixed_ranges);
+}
+
+static void __cpuinit print_fixed(unsigned base, unsigned step,
+ const mtrr_type*types)
{
unsigned i;
diff -puN include/asm-i386/mtrr.h~mtrr-implement-mtrr_save_fixed_ranges include/asm-i386/mtrr.h
--- a/include/asm-i386/mtrr.h~mtrr-implement-mtrr_save_fixed_ranges
+++ a/include/asm-i386/mtrr.h
@@ -69,6 +69,7 @@ struct mtrr_gentry
/* The following functions are for use by other drivers */
# ifdef CONFIG_MTRR
+extern void mtrr_save_fixed_ranges(void *);
extern int mtrr_add (unsigned long base, unsigned long size,
unsigned int type, char increment);
extern int mtrr_add_page (unsigned long base, unsigned long size,
@@ -79,6 +80,7 @@ extern void mtrr_centaur_report_mcr(int
extern void mtrr_ap_init(void);
extern void mtrr_bp_init(void);
# else
+#define mtrr_save_fixed_ranges(arg) do {} while (0)
static __inline__ int mtrr_add (unsigned long base, unsigned long size,
unsigned int type, char increment)
{
diff -puN include/asm-x86_64/proto.h~mtrr-implement-mtrr_save_fixed_ranges include/asm-x86_64/proto.h
--- a/include/asm-x86_64/proto.h~mtrr-implement-mtrr_save_fixed_ranges
+++ a/include/asm-x86_64/proto.h
@@ -17,9 +17,11 @@ extern void mcheck_init(struct cpuinfo_x
#ifdef CONFIG_MTRR
extern void mtrr_ap_init(void);
extern void mtrr_bp_init(void);
+extern void mtrr_save_fixed_ranges(void *);
#else
#define mtrr_ap_init() do {} while (0)
#define mtrr_bp_init() do {} while (0)
+#define mtrr_save_fixed_ranges(arg) do {} while (0)
#endif
extern void init_memory_mapping(unsigned long start, unsigned long end);
_
Patches currently in -mm which might be from bk@xxxxxxx are
mtrr-implement-mtrr_save_fixed_ranges.patch
mtrr-save-the-mtrrs-of-the-bsp-before-booting-an-ap.patch
mtrr-bsp-save-and-restore-fixed-range-mtrrs-during-suspend.patch
mtrr-enable-fixed-range-iorrs-to-sync-rdmem-and-wrmem.patch
-
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