x86/mce/amd, edac: Remove report_gart_errors

... because no one should be interested in spurious MCEs anyway. Make
the filtering unconditional and move it to amd_filter_mce().

Signed-off-by: Borislav Petkov <[email protected]>
Tested-by: Tony Luck <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

Author: suryasaimadhu

arch/x86/include/asm/mce.h

@@ -127,6 +127,8 @@
 #define MSR_AMD64_SMCA_MCx_DEADDR(x)	(MSR_AMD64_SMCA_MC0_DEADDR + 0x10*(x))
 #define MSR_AMD64_SMCA_MCx_MISCy(x, y)	((MSR_AMD64_SMCA_MC0_MISC1 + y) + (0x10*(x)))
 
+#define XEC(x, mask)			(((x) >> 16) & mask)
+
 /*
  * This structure contains all data related to the MCE log.  Also
  * carries a signature to make it easier to find from external
@@ -347,5 +349,4 @@ umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)	{ return
 #endif
 
 static inline void mce_hygon_feature_init(struct cpuinfo_x86 *c)	{ return mce_amd_feature_init(c); }
-
 #endif /* _ASM_X86_MCE_H */

arch/x86/kernel/cpu/mce/amd.c

@@ -577,14 +577,19 @@ bool amd_filter_mce(struct mce *m)
 {
 	enum smca_bank_types bank_type = smca_get_bank_type(m->bank);
 	struct cpuinfo_x86 *c = &boot_cpu_data;
-	u8 xec = (m->status >> 16) & 0x3F;
 
 	/* See Family 17h Models 10h-2Fh Erratum #1114. */
 	if (c->x86 == 0x17 &&
 	    c->x86_model >= 0x10 && c->x86_model <= 0x2F &&
-	    bank_type == SMCA_IF && xec == 10)
+	    bank_type == SMCA_IF && XEC(m->status, 0x3f) == 10)
 		return true;
 
+	/* NB GART TLB error reporting is disabled by default. */
+	if (c->x86 < 0x17) {
+		if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5)
+			return true;
+	}
+
 	return false;
 }
 

drivers/edac/amd64_edac.c

@@ -4,9 +4,6 @@
 
 static struct edac_pci_ctl_info *pci_ctl;
 
-static int report_gart_errors;
-module_param(report_gart_errors, int, 0644);
-
 /*
  * Set by command line parameter. If BIOS has enabled the ECC, this override is
  * cleared to prevent re-enabling the hardware by this driver.
@@ -3681,9 +3678,6 @@ static int __init amd64_edac_init(void)
 	}
 
 	/* register stuff with EDAC MCE */
-	if (report_gart_errors)
-		amd_report_gart_errors(true);
-
 	if (boot_cpu_data.x86 >= 0x17)
 		amd_register_ecc_decoder(decode_umc_error);
 	else
@@ -3718,8 +3712,6 @@ static void __exit amd64_edac_exit(void)
 		edac_pci_release_generic_ctl(pci_ctl);
 
 	/* unregister from EDAC MCE */
-	amd_report_gart_errors(false);
-
 	if (boot_cpu_data.x86 >= 0x17)
 		amd_unregister_ecc_decoder(decode_umc_error);
 	else

drivers/edac/mce_amd.c

@@ -10,15 +10,8 @@ static struct amd_decoder_ops fam_ops;
 
 static u8 xec_mask	 = 0xf;
 
-static bool report_gart_errors;
 static void (*decode_dram_ecc)(int node_id, struct mce *m);
 
-void amd_report_gart_errors(bool v)
-{
-	report_gart_errors = v;
-}
-EXPORT_SYMBOL_GPL(amd_report_gart_errors);
-
 void amd_register_ecc_decoder(void (*f)(int, struct mce *))
 {
 	decode_dram_ecc = f;
@@ -1030,20 +1023,6 @@ static inline void amd_decode_err_code(u16 ec)
 	pr_cont("\n");
 }
 
-/*
- * Filter out unwanted MCE signatures here.
- */
-static bool ignore_mce(struct mce *m)
-{
-	/*
-	 * NB GART TLB error reporting is disabled by default.
-	 */
-	if (m->bank == 4 && XEC(m->status, 0x1f) == 0x5 && !report_gart_errors)
-		return true;
-
-	return false;
-}
-
 static const char *decode_error_status(struct mce *m)
 {
 	if (m->status & MCI_STATUS_UC) {
@@ -1067,9 +1046,6 @@ amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
 	unsigned int fam = x86_family(m->cpuid);
 	int ecc;
 
-	if (ignore_mce(m))
-		return NOTIFY_STOP;
-
 	pr_emerg(HW_ERR "%s\n", decode_error_status(m));
 
 	pr_emerg(HW_ERR "CPU:%d (%x:%x:%x) MC%d_STATUS[%s|%s|%s|%s|%s",

drivers/edac/mce_amd.h

@@ -7,7 +7,6 @@
 #include <asm/mce.h>
 
 #define EC(x)				((x) & 0xffff)
-#define XEC(x, mask)			(((x) >> 16) & mask)
 
 #define LOW_SYNDROME(x)			(((x) >> 15) & 0xff)
 #define HIGH_SYNDROME(x)		(((x) >> 24) & 0xff)
@@ -77,7 +76,6 @@ struct amd_decoder_ops {
 	bool (*mc2_mce)(u16, u8);
 };
 
-void amd_report_gart_errors(bool);
 void amd_register_ecc_decoder(void (*f)(int, struct mce *));
 void amd_unregister_ecc_decoder(void (*f)(int, struct mce *));