[tip: ras/core] x86/mce: Add a clear_bank() helper

["tip-bot2 for Yazen Ghannam" <tip-bot2@linutronix.de>]

The following commit has been merged into the ras/core branch of tip:

Commit-ID:     5c6f123c419b6e20f84ac1683089a52f449273aa
Gitweb:        https://git.kernel.org/tip/5c6f123c419b6e20f84ac1683089a52f449273aa
Author:        Yazen Ghannam <yazen.ghannam@amd.com>
AuthorDate:    Mon, 08 Sep 2025 15:40:36 
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Thu, 11 Sep 2025 12:23:30 +02:00

x86/mce: Add a clear_bank() helper

Add a helper at the end of the MCA polling function to collect vendor and/or
feature actions.

Start with a basic skeleton for now. Actions for AMD thresholding and deferred
errors will be added later.

  [ bp: Drop the obvious comment too. ]

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Link: https://lore.kernel.org/20250908-wip-mca-updates-v6-0-eef5d6c74b9c@amd.com
---
 arch/x86/kernel/cpu/mce/amd.c      |  5 +++++
 arch/x86/kernel/cpu/mce/core.c     | 15 ++++++++++-----
 arch/x86/kernel/cpu/mce/internal.h |  3 +++
 3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index b8aed0a..d690644 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -955,6 +955,11 @@ static void amd_threshold_interrupt(void)
 	}
 }
 
+void amd_clear_bank(struct mce *m)
+{
+	mce_wrmsrq(mca_msr_reg(m->bank, MCA_STATUS), 0);
+}
+
 /*
  * Sysfs Interface
  */
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 5dec0da..460e90a 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -423,7 +423,7 @@ noinstr u64 mce_rdmsrq(u32 msr)
 	return EAX_EDX_VAL(val, low, high);
 }
 
-static noinstr void mce_wrmsrq(u32 msr, u64 v)
+noinstr void mce_wrmsrq(u32 msr, u64 v)
 {
 	u32 low, high;
 
@@ -760,6 +760,14 @@ static bool should_log_poll_error(enum mcp_flags flags, struct mce_hw_err *err)
 	return true;
 }
 
+static void clear_bank(struct mce *m)
+{
+	if (m->cpuvendor == X86_VENDOR_AMD)
+		return amd_clear_bank(m);
+
+	mce_wrmsrq(mca_msr_reg(m->bank, MCA_STATUS), 0);
+}
+
 /*
  * Poll for corrected events or events that happened before reset.
  * Those are just logged through /dev/mcelog.
@@ -831,10 +839,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 			mce_log(&err);
 
 clear_it:
-		/*
-		 * Clear state for this bank.
-		 */
-		mce_wrmsrq(mca_msr_reg(i, MCA_STATUS), 0);
+		clear_bank(m);
 	}
 
 	/*
diff --git a/arch/x86/kernel/cpu/mce/internal.h b/arch/x86/kernel/cpu/mce/internal.h
index 6cb2995..b0e00ec 100644
--- a/arch/x86/kernel/cpu/mce/internal.h
+++ b/arch/x86/kernel/cpu/mce/internal.h
@@ -269,6 +269,7 @@ void mce_threshold_create_device(unsigned int cpu);
 void mce_threshold_remove_device(unsigned int cpu);
 extern bool amd_filter_mce(struct mce *m);
 bool amd_mce_usable_address(struct mce *m);
+void amd_clear_bank(struct mce *m);
 
 /*
  * If MCA_CONFIG[McaLsbInStatusSupported] is set, extract ErrAddr in bits
@@ -300,6 +301,7 @@ static inline void mce_threshold_create_device(unsigned int cpu)	{ }
 static inline void mce_threshold_remove_device(unsigned int cpu)	{ }
 static inline bool amd_filter_mce(struct mce *m) { return false; }
 static inline bool amd_mce_usable_address(struct mce *m) { return false; }
+static inline void amd_clear_bank(struct mce *m) { }
 static inline void smca_extract_err_addr(struct mce *m) { }
 static inline void smca_bsp_init(void) { }
 #endif
@@ -319,6 +321,7 @@ static __always_inline void winchip_machine_check(struct pt_regs *regs) {}
 #endif
 
 noinstr u64 mce_rdmsrq(u32 msr);
+noinstr void mce_wrmsrq(u32 msr, u64 v);
 
 static __always_inline u32 mca_msr_reg(int bank, enum mca_msr reg)
 {