On Tue, Jun 25, 2024 at 02:56:23PM -0500, Avadhut Naik wrote:

From: Yazen Ghannam <yazen.ghannam@amd.com>

ACPI Boot Error Record Table (BERT) is being used by the kernel to
report errors that occurred in a previous boot. On some modern AMD
systems, these very errors within the BERT are reported through the
x86 Common Platform Error Record (CPER) format which consists of one
or more Processor Context Information Structures. These context
structures provide a starting address and represent an x86 MSR range
in which the data constitutes a contiguous set of MSRs starting from,
and including the starting address.

It's common, for AMD systems that implement this behavior, that the
MSR range represents the MCAX register space used for the Scalable MCA
feature. The apei_smca_report_x86_error() function decodes and passes
this information through the MCE notifier chain. However, this function
assumes a fixed register size based on the original HW/FW implementation.

This assumption breaks with the addition of two new MCAX registers viz.
MCA_SYND1 and MCA_SYND2. These registers are added at the end of the
MCAX register space, so they won't be included when decoding the CPER
data.

Rework apei_smca_report_x86_error() to support a variable register array
size. This covers any case where the MSR context information starts at
the MCAX address for MCA_STATUS and ends at any other register within
the MCAX register space.

Add code comments indicating the MCAX register at each offset.

[Yazen: Add Avadhut as co-developer for wrapper changes.]

Co-developed-by: Avadhut Naik <avadhut.naik@amd.com>
Signed-off-by: Avadhut Naik <avadhut.naik@amd.com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>

This needs Avadhut's SOB after Yazen's.

Touchups ontop:

diff --git a/arch/x86/kernel/cpu/mce/apei.c b/arch/x86/kernel/cpu/mce/apei.c
index 7a15f0ca1bd1..6bbeb29125a9 100644
--- a/arch/x86/kernel/cpu/mce/apei.c
+++ b/arch/x86/kernel/cpu/mce/apei.c

@@ -69,7 +69,7 @@ EXPORT_SYMBOL_GPL(apei_mce_report_mem_error);
 int apei_smca_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id)
 {
 	const u64 *i_mce = ((const u64 *) (ctx_info + 1));
-	unsigned int cpu, num_registers;
+	unsigned int cpu, num_regs;
 	struct mce_hw_err err;
 	struct mce *m = &err.m;
 

@@ -93,10 +93,10 @@ int apei_smca_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id)
 	/*
 	 * The number of registers in the register array is determined by
 	 * Register Array Size/8 as defined in UEFI spec v2.8, sec N.2.4.2.2.
-	 * Ensure that the array size includes at least 1 register.
+	 * Sanity-check registers array size.
 	 */
-	num_registers = ctx_info->reg_arr_size >> 3;
-	if (!num_registers)
+	num_regs = ctx_info->reg_arr_size >> 3;
+	if (!num_regs)
 		return -EINVAL;
 
 	mce_setup(m);

@@ -118,13 +118,12 @@ int apei_smca_report_x86_error(struct cper_ia_proc_ctx *ctx_info, u64 lapic_id)
 	/*
 	 * The SMCA register layout is fixed and includes 16 registers.
 	 * The end of the array may be variable, but the beginning is known.
-	 * Switch on the number of registers. Cap the number of registers to
-	 * expected max (15).
+	 * Cap the number of registers to expected max (15).
 	 */
-	if (num_registers > 15)
-		num_registers = 15;
+	if (num_regs > 15)
+		num_regs = 15;
 
-	switch (num_registers) {
+	switch (num_regs) {
 	/* MCA_SYND2 */
 	case 15:
 		err.vi.amd.synd2 = *(i_mce + 14);

-- 
Regards/Gruss,
    Boris.

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