mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/acpi/apei/bert.c
..
..
@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * APEI Boot Error Record Table (BERT) support
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  *
..
..
@@ -16,9 +17,6 @@
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  *
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  * For more information about BERT, please refer to ACPI Specification
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  * version 4.0, section 17.3.1
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- *
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- * This file is licensed under GPLv2.
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- *
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  */
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21
 
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 #include <linux/kernel.h>
..
..
@@ -32,35 +30,52 @@
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 #undef pr_fmt
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 #define pr_fmt(fmt) "BERT: " fmt
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32
 
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+#define ACPI_BERT_PRINT_MAX_RECORDS 5
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+#define ACPI_BERT_PRINT_MAX_LEN 1024
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+
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 static int bert_disable;
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37
 
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+/*
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+ * Print "all" the error records in the BERT table, but avoid huge spam to
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+ * the console if the BIOS included oversize records, or too many records.
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+ * Skipping some records here does not lose anything because the full
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+ * data is available to user tools in:
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+ *	/sys/firmware/acpi/tables/data/BERT
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+ */
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 static void __init bert_print_all(struct acpi_bert_region *region,
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 				  unsigned int region_len)
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 {
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 	struct acpi_hest_generic_status *estatus =
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 		(struct acpi_hest_generic_status *)region;
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 	int remain = region_len;
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+	int printed = 0, skipped = 0;
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 	u32 estatus_len;
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53
 
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-	if (!estatus->block_status)
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-		return;
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-
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-	while (remain > sizeof(struct acpi_bert_region)) {
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-		if (cper_estatus_check(estatus)) {
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-			pr_err(FW_BUG "Invalid error record.\n");
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-			return;
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-		}
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-
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+	while (remain >= sizeof(struct acpi_bert_region)) {
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 		estatus_len = cper_estatus_len(estatus);
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 		if (remain < estatus_len) {
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 			pr_err(FW_BUG "Truncated status block (length: %u).\n",
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 			       estatus_len);
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-			return;
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+			break;
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 		}
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61
 
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-		pr_info_once("Error records from previous boot:\n");
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+		/* No more error records. */
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+		if (!estatus->block_status)
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+			break;
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65
 
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-		cper_estatus_print(KERN_INFO HW_ERR, estatus);
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+		if (cper_estatus_check(estatus)) {
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+			pr_err(FW_BUG "Invalid error record.\n");
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+			break;
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+		}
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+
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+		if (estatus_len < ACPI_BERT_PRINT_MAX_LEN &&
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+		    printed < ACPI_BERT_PRINT_MAX_RECORDS) {
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+			pr_info_once("Error records from previous boot:\n");
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+			cper_estatus_print(KERN_INFO HW_ERR, estatus);
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+			printed++;
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+		} else {
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+			skipped++;
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+		}
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79
 
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 		/*
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 		 * Because the boot error source is "one-time polled" type,
..
..
@@ -70,19 +85,18 @@
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 		estatus->block_status = 0;
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86
 
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 		estatus = (void *)estatus + estatus_len;
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-		/* No more error records. */
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-		if (!estatus->block_status)
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-			return;
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-
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 		remain -= estatus_len;
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 	}
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+
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+	if (skipped)
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+		pr_info(HW_ERR "Skipped %d error records\n", skipped);
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 }
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94
 
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 static int __init setup_bert_disable(char *str)
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 {
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 	bert_disable = 1;
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-	return 0;
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+	return 1;
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 }
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 __setup("bert_disable", setup_bert_disable);
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102
 
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@@ -124,7 +138,7 @@
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 	rc = bert_check_table(bert_tab);
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 	if (rc) {
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 		pr_err(FW_BUG "table invalid.\n");
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-		return rc;
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+		goto out_put_bert_tab;
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 	}
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 	region_len = bert_tab->region_length;
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@@ -132,7 +146,7 @@
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 	rc = apei_resources_add(&bert_resources, bert_tab->address,
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 				region_len, true);
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 	if (rc)
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-		return rc;
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+		goto out_put_bert_tab;
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 	rc = apei_resources_request(&bert_resources, "APEI BERT");
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 	if (rc)
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 		goto out_fini;
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@@ -147,6 +161,8 @@
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 	apei_resources_release(&bert_resources);
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162
 out_fini:
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 	apei_resources_fini(&bert_resources);
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+out_put_bert_tab:
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+	acpi_put_table((struct acpi_table_header *)bert_tab);
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166
 
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 	return rc;
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 }