[PATCH v2 4/7] EDAC/intel-bff: Add Diamond Rapids support

[Tony Luck <tony.luck@intel.com>]

There are potentially bitfix filters associated with each machine check
bank. Only some banks may implement them.

Machine check banks have varying scope. E.g. there is a separate L2
cache for each module, each instance has its own bitfix filter.

Add information that will be used to map a <cpu,bank> pair to a unique
instance number for a bitfix filter.

Co-developed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---
 drivers/edac/intel-bff.c | 45 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/edac/intel-bff.c b/drivers/edac/intel-bff.c
index 905cbe58bc53..f70c5e697dae 100644
--- a/drivers/edac/intel-bff.c
+++ b/drivers/edac/intel-bff.c
@@ -18,18 +18,55 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/cpufeature.h>
+#include <linux/device-id/x86_cpu.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/printk.h>
 #include <linux/types.h>
 
+#include <asm/cpu_device_id.h>
 #include <asm/cpufeatures.h>
+#include <asm/intel-family.h>
 #include <asm/mce.h>
 #include <asm/msr.h>
 #include <asm/msr-index.h>
 
+/* Machine check bank hardware unit types */
+enum bff_bank_type {
+	BFF_BANK_NONE = 0,
+	BFF_BANK_DCU,
+	BFF_BANK_DTLB,
+	BFF_BANK_MLC,
+	BFF_BANK_CCF,
+	BFF_BANK_HSF,
+	BFF_BANK_IOCACHE,
+};
+
+/*
+ * Mapping from machine check bank numbers on Diamond Rapids CPU, that are
+ * supported by a bitfix filter, to hardware unit type.
+ */
+static const enum bff_bank_type dmr_mcbanks[MAX_NR_BANKS] = {
+	[1]	= BFF_BANK_DCU,
+	[2]	= BFF_BANK_DTLB,
+	[3]	= BFF_BANK_MLC,
+	[6]	= BFF_BANK_CCF,
+	[13]	= BFF_BANK_HSF,
+	[17]	= BFF_BANK_IOCACHE
+};
+
+static const struct x86_cpu_id bff_cpu_ids[] __initconst = {
+	X86_MATCH_VFM(INTEL_DIAMONDRAPIDS_X, dmr_mcbanks),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, bff_cpu_ids);
+
+static const enum bff_bank_type *bff_bank_types;
+
 static int __init bff_init(void)
 {
+	const struct x86_cpu_id *m;
 	u64 core_caps, mcg_cap;
 
 	if (!cpu_feature_enabled(X86_FEATURE_MCA))
@@ -44,6 +81,14 @@ static int __init bff_init(void)
 	if (!(core_caps & MSR_IA32_CORE_CAPS_BFF_RESET))
 		return -ENODEV;
 
+	m = x86_match_cpu(bff_cpu_ids);
+	if (!m) {
+		pr_info("CPU model not supported by the bitfix filter reset driver\n");
+		return -ENODEV;
+	}
+
+	bff_bank_types = (const enum bff_bank_type *)m->driver_data;
+
 	return 0;
 }
 
-- 
2.55.0