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Date: Wed, 2 Nov 2022 08:47:13 +0100
From: Juergen Gross <jgross@...e.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org
Cc: Juergen Gross <jgross@...e.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH v5 16/16] x86/mtrr: simplify mtrr_ops initialization
The way mtrr_if is initialized with the correct mtrr_ops structure is
quite weird.
Simplify that by dropping the vendor specific init functions and the
mtrr_ops[] array. Replace those with direct assignments of the related
vendor specific ops array to mtrr_if.
Note that a direct assignment is okay even for 64-bit builds, where the
symbol isn't present, as the related code will be subject to "dead code
elimination" due to how cpu_feature_enabled() is implemented.
Signed-off-by: Juergen Gross <jgross@...e.com>
---
V4:
- new patch
V5:
- drop the vendor_mtrr_ops() macro (Borislav Petkov)
---
arch/x86/kernel/cpu/mtrr/amd.c | 8 +-------
arch/x86/kernel/cpu/mtrr/centaur.c | 8 +-------
arch/x86/kernel/cpu/mtrr/cyrix.c | 8 +-------
arch/x86/kernel/cpu/mtrr/mtrr.c | 30 +++---------------------------
arch/x86/kernel/cpu/mtrr/mtrr.h | 10 ++++------
5 files changed, 10 insertions(+), 54 deletions(-)
diff --git a/arch/x86/kernel/cpu/mtrr/amd.c b/arch/x86/kernel/cpu/mtrr/amd.c
index a65a0272096d..eff6ac62c0ff 100644
--- a/arch/x86/kernel/cpu/mtrr/amd.c
+++ b/arch/x86/kernel/cpu/mtrr/amd.c
@@ -109,7 +109,7 @@ amd_validate_add_page(unsigned long base, unsigned long size, unsigned int type)
return 0;
}
-static const struct mtrr_ops amd_mtrr_ops = {
+const struct mtrr_ops amd_mtrr_ops = {
.vendor = X86_VENDOR_AMD,
.set = amd_set_mtrr,
.get = amd_get_mtrr,
@@ -117,9 +117,3 @@ static const struct mtrr_ops amd_mtrr_ops = {
.validate_add_page = amd_validate_add_page,
.have_wrcomb = positive_have_wrcomb,
};
-
-int __init amd_init_mtrr(void)
-{
- set_mtrr_ops(&amd_mtrr_ops);
- return 0;
-}
diff --git a/arch/x86/kernel/cpu/mtrr/centaur.c b/arch/x86/kernel/cpu/mtrr/centaur.c
index f27177816569..b8a74eddde83 100644
--- a/arch/x86/kernel/cpu/mtrr/centaur.c
+++ b/arch/x86/kernel/cpu/mtrr/centaur.c
@@ -111,7 +111,7 @@ centaur_validate_add_page(unsigned long base, unsigned long size, unsigned int t
return 0;
}
-static const struct mtrr_ops centaur_mtrr_ops = {
+const struct mtrr_ops centaur_mtrr_ops = {
.vendor = X86_VENDOR_CENTAUR,
.set = centaur_set_mcr,
.get = centaur_get_mcr,
@@ -119,9 +119,3 @@ static const struct mtrr_ops centaur_mtrr_ops = {
.validate_add_page = centaur_validate_add_page,
.have_wrcomb = positive_have_wrcomb,
};
-
-int __init centaur_init_mtrr(void)
-{
- set_mtrr_ops(¢aur_mtrr_ops);
- return 0;
-}
diff --git a/arch/x86/kernel/cpu/mtrr/cyrix.c b/arch/x86/kernel/cpu/mtrr/cyrix.c
index c77d3b0a5bf2..173b9e01e623 100644
--- a/arch/x86/kernel/cpu/mtrr/cyrix.c
+++ b/arch/x86/kernel/cpu/mtrr/cyrix.c
@@ -234,7 +234,7 @@ static void cyrix_set_arr(unsigned int reg, unsigned long base,
post_set();
}
-static const struct mtrr_ops cyrix_mtrr_ops = {
+const struct mtrr_ops cyrix_mtrr_ops = {
.vendor = X86_VENDOR_CYRIX,
.set = cyrix_set_arr,
.get = cyrix_get_arr,
@@ -242,9 +242,3 @@ static const struct mtrr_ops cyrix_mtrr_ops = {
.validate_add_page = generic_validate_add_page,
.have_wrcomb = positive_have_wrcomb,
};
-
-int __init cyrix_init_mtrr(void)
-{
- set_mtrr_ops(&cyrix_mtrr_ops);
- return 0;
-}
diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.c b/arch/x86/kernel/cpu/mtrr/mtrr.c
index 8403daf34158..6432abccbf56 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.c
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.c
@@ -69,16 +69,8 @@ static DEFINE_MUTEX(mtrr_mutex);
u64 size_or_mask, size_and_mask;
-static const struct mtrr_ops *mtrr_ops[X86_VENDOR_NUM] __ro_after_init;
-
const struct mtrr_ops *mtrr_if;
-void __init set_mtrr_ops(const struct mtrr_ops *ops)
-{
- if (ops->vendor && ops->vendor < X86_VENDOR_NUM)
- mtrr_ops[ops->vendor] = ops;
-}
-
/* Returns non-zero if we have the write-combining memory type */
static int have_wrcomb(void)
{
@@ -582,20 +574,6 @@ int arch_phys_wc_index(int handle)
}
EXPORT_SYMBOL_GPL(arch_phys_wc_index);
-/*
- * HACK ALERT!
- * These should be called implicitly, but we can't yet until all the initcall
- * stuff is done...
- */
-static void __init init_ifs(void)
-{
-#ifndef CONFIG_X86_64
- amd_init_mtrr();
- cyrix_init_mtrr();
- centaur_init_mtrr();
-#endif
-}
-
/* The suspend/resume methods are only for CPU without MTRR. CPU using generic
* MTRR driver doesn't require this
*/
@@ -653,8 +631,6 @@ void __init mtrr_bp_init(void)
{
u32 phys_addr;
- init_ifs();
-
phys_addr = 32;
if (boot_cpu_has(X86_FEATURE_MTRR)) {
@@ -695,21 +671,21 @@ void __init mtrr_bp_init(void)
case X86_VENDOR_AMD:
if (cpu_feature_enabled(X86_FEATURE_K6_MTRR)) {
/* Pre-Athlon (K6) AMD CPU MTRRs */
- mtrr_if = mtrr_ops[X86_VENDOR_AMD];
+ mtrr_if = &amd_mtrr_ops;
size_or_mask = SIZE_OR_MASK_BITS(32);
size_and_mask = 0;
}
break;
case X86_VENDOR_CENTAUR:
if (cpu_feature_enabled(X86_FEATURE_CENTAUR_MCR)) {
- mtrr_if = mtrr_ops[X86_VENDOR_CENTAUR];
+ mtrr_if = ¢aur_mtrr_ops;
size_or_mask = SIZE_OR_MASK_BITS(32);
size_and_mask = 0;
}
break;
case X86_VENDOR_CYRIX:
if (cpu_feature_enabled(X86_FEATURE_CYRIX_ARR)) {
- mtrr_if = mtrr_ops[X86_VENDOR_CYRIX];
+ mtrr_if = &cyrix_mtrr_ops;
size_or_mask = SIZE_OR_MASK_BITS(32);
size_and_mask = 0;
}
diff --git a/arch/x86/kernel/cpu/mtrr/mtrr.h b/arch/x86/kernel/cpu/mtrr/mtrr.h
index c98928ceee6a..02eb5871492d 100644
--- a/arch/x86/kernel/cpu/mtrr/mtrr.h
+++ b/arch/x86/kernel/cpu/mtrr/mtrr.h
@@ -51,8 +51,6 @@ void fill_mtrr_var_range(unsigned int index,
u32 base_lo, u32 base_hi, u32 mask_lo, u32 mask_hi);
bool get_mtrr_state(void);
-extern void __init set_mtrr_ops(const struct mtrr_ops *ops);
-
extern u64 size_or_mask, size_and_mask;
extern const struct mtrr_ops *mtrr_if;
@@ -66,10 +64,10 @@ void mtrr_state_warn(void);
const char *mtrr_attrib_to_str(int x);
void mtrr_wrmsr(unsigned, unsigned, unsigned);
-/* CPU specific mtrr init functions */
-int amd_init_mtrr(void);
-int cyrix_init_mtrr(void);
-int centaur_init_mtrr(void);
+/* CPU specific mtrr_ops vectors. */
+extern const struct mtrr_ops amd_mtrr_ops;
+extern const struct mtrr_ops cyrix_mtrr_ops;
+extern const struct mtrr_ops centaur_mtrr_ops;
extern int changed_by_mtrr_cleanup;
extern int mtrr_cleanup(unsigned address_bits);
--
2.35.3
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