add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/acpi/acpi_extlog.c
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@@ -1,10 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Extended Error Log driver
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  *
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  * Copyright (C) 2013 Intel Corp.
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  * Author: Chen, Gong <gong.chen@intel.com>
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- *
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- * This file is licensed under GPLv2.
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  */
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 #include <linux/module.h>
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@@ -13,6 +12,7 @@
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 #include <linux/ratelimit.h>
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 #include <linux/edac.h>
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 #include <linux/ras.h>
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+#include <acpi/ghes.h>
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 #include <asm/cpu.h>
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 #include <asm/mce.h>
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@@ -42,8 +42,6 @@
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 	u32 entries;	/* Valid L1 Directory entries per logical processor */
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 	u8  rev1[12];
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 };
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-
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-static int old_edac_report_status;
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 static u8 extlog_dsm_uuid[] __initdata = "663E35AF-CC10-41A4-88EA-5470AF055295";
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@@ -141,13 +139,13 @@
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 	int	cpu = mce->extcpu;
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 	struct acpi_hest_generic_status *estatus, *tmp;
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 	struct acpi_hest_generic_data *gdata;
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-	const guid_t *fru_id = &guid_null;
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-	char *fru_text = "";
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+	const guid_t *fru_id;
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+	char *fru_text;
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 	guid_t *sec_type;
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 	static u32 err_seq;
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 	estatus = extlog_elog_entry_check(cpu, bank);
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-	if (estatus == NULL)
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+	if (estatus == NULL || (mce->kflags & MCE_HANDLED_CEC))
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 		return NOTIFY_DONE;
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 	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
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@@ -163,21 +161,28 @@
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 	/* log event via trace */
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 	err_seq++;
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-	gdata = (struct acpi_hest_generic_data *)(tmp + 1);
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-	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
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-		fru_id = (guid_t *)gdata->fru_id;
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-	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
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-		fru_text = gdata->fru_text;
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-	sec_type = (guid_t *)gdata->section_type;
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-	if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
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-		struct cper_sec_mem_err *mem = (void *)(gdata + 1);
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-		if (gdata->error_data_length >= sizeof(*mem))
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-			trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
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-					       (u8)gdata->error_severity);
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+	apei_estatus_for_each_section(tmp, gdata) {
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+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
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+			fru_id = (guid_t *)gdata->fru_id;
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+		else
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+			fru_id = &guid_null;
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+		if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
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+			fru_text = gdata->fru_text;
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+		else
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+			fru_text = "";
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+		sec_type = (guid_t *)gdata->section_type;
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+		if (guid_equal(sec_type, &CPER_SEC_PLATFORM_MEM)) {
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+			struct cper_sec_mem_err *mem = (void *)(gdata + 1);
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+
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+			if (gdata->error_data_length >= sizeof(*mem))
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+				trace_extlog_mem_event(mem, err_seq, fru_id, fru_text,
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+						       (u8)gdata->error_severity);
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+		}
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 	}
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 out:
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-	return NOTIFY_STOP;
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+	mce->kflags |= MCE_HANDLED_EXTLOG;
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+	return NOTIFY_OK;
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 }
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 static bool __init extlog_get_l1addr(void)
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@@ -229,11 +234,6 @@
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 	    !extlog_get_l1addr())
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 		return -ENODEV;
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-	if (edac_get_report_status() == EDAC_REPORTING_FORCE) {
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-		pr_warn("Not loading eMCA, error reporting force-enabled through EDAC.\n");
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-		return -EPERM;
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-	}
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-
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 	rc = -EINVAL;
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 	/* get L1 header to fetch necessary information */
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 	l1_hdr_size = sizeof(struct extlog_l1_head);
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@@ -281,12 +281,6 @@
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 	if (elog_buf == NULL)
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 		goto err_release_elog;
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-	/*
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-	 * eMCA event report method has higher priority than EDAC method,
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-	 * unless EDAC event report method is mandatory.
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-	 */
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-	old_edac_report_status = edac_get_report_status();
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-	edac_set_report_status(EDAC_REPORTING_DISABLED);
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 	mce_register_decode_chain(&extlog_mce_dec);
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 	/* enable OS to be involved to take over management from BIOS */
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 	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
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@@ -308,7 +302,6 @@
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 static void __exit extlog_exit(void)
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 {
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-	edac_set_report_status(old_edac_report_status);
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 	mce_unregister_decode_chain(&extlog_mce_dec);
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 	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
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 	if (extlog_l1_addr)