mcax_bert.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/mca.h>
#include <amdblocks/msr_zen.h>
#include <cpu/x86/msr.h>
#include <acpi/acpi.h>
#include <console/console.h>
#include <arch/bert_storage.h>
#include <cper.h>
#include <types.h>
#include "mca_common_defs.h"
 
/* MISC4 is the last used register in the MCAX banks of Picasso */
#define MCAX_USED_REGISTERS_PER_BANK    (MCAX_MISC4_OFFSET + 1)
 
static inline size_t mca_report_size_reqd(void)
{
        size_t size;
 
        size = sizeof(acpi_generic_error_status_t);
 
        size += sizeof(acpi_hest_generic_data_v300_t);
        size += sizeof(cper_proc_generic_error_section_t);
 
        size += sizeof(acpi_hest_generic_data_v300_t);
        size += sizeof(cper_ia32x64_proc_error_section_t);
 
        /* Check Error */
        size += cper_ia32x64_check_sz();
 
        /* Context of MCG_CAP, MCG_STAT, MCG_CTL */
        size += cper_ia32x64_ctx_sz_bytype(CPER_IA32X64_CTX_MSR, 3);
 
        /* Context of CTL, STATUS, ADDR, MISC0, CONFIG, IPID, SYND, RESERVED, DESTAT, DEADDR,
           MISC1, MISC2, MISC3, MISC4 */
        size += cper_ia32x64_ctx_sz_bytype(CPER_IA32X64_CTX_MSR, MCAX_USED_REGISTERS_PER_BANK);
 
        /* Context of CTL_MASK */
        size += cper_ia32x64_ctx_sz_bytype(CPER_IA32X64_CTX_MSR, 1);
 
        return size;
}
 
/* Convert an error reported by an MCA bank into BERT information to be reported
 * by the OS.  The ACPI driver doesn't recognize/parse the IA32/X64 structure,
 * which is the best method to report MSR context.  As a result, add two
 * structures:  A "processor generic error" that is parsed, and an IA32/X64 one
 * to capture complete information.
 */
void build_bert_mca_error(struct mca_bank_status *mci)
{
        acpi_generic_error_status_t *status;
        acpi_hest_generic_data_v300_t *gen_entry;
        acpi_hest_generic_data_v300_t *x86_entry;
        cper_proc_generic_error_section_t *gen_sec;
        cper_ia32x64_proc_error_section_t *x86_sec;
        cper_ia32x64_proc_error_info_t *chk;
        cper_ia32x64_context_t *ctx;
 
        if (mca_report_size_reqd() > bert_storage_remaining())
                goto failed;
 
        status = bert_new_event(&CPER_SEC_PROC_GENERIC_GUID);
        if (!status)
                goto failed;
 
        gen_entry = acpi_hest_generic_data3(status);
        gen_sec = section_of_acpientry(gen_sec, gen_entry);
 
        fill_generic_section(gen_sec, mci);
 
        x86_entry = bert_append_ia32x64(status);
        x86_sec = section_of_acpientry(x86_sec, x86_entry);
 
        chk = new_cper_ia32x64_check(status, x86_sec, error_to_chktype(mci));
        if (!chk)
                goto failed;
 
        ctx = cper_new_ia32x64_context_msr(status, x86_sec, IA32_MCG_CAP, 3);
        if (!ctx)
                goto failed;
        ctx = cper_new_ia32x64_context_msr(status, x86_sec, MCAX_CTL_MSR(mci->bank),
                                           MCAX_USED_REGISTERS_PER_BANK);
        if (!ctx)
                goto failed;
        ctx = cper_new_ia32x64_context_msr(status, x86_sec, MCA_CTL_MASK_MSR(mci->bank), 1);
        if (!ctx)
                goto failed;
 
        return;
 
failed:
        /* We're here because of a hardware error, don't break something else */
        printk(BIOS_ERR, "Not enough room in BERT region for Machine Check error\n");
}