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path: root/drivers/acpi/apei/hest.c
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Diffstat (limited to 'drivers/acpi/apei/hest.c')
-rw-r--r--drivers/acpi/apei/hest.c119
1 files changed, 91 insertions, 28 deletions
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index b1e9f81ebeea..20d757687e3d 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -1,5 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
- * APEI Hardware Error Souce Table support
+ * APEI Hardware Error Source Table support
*
* HEST describes error sources in detail; communicates operational
* parameters (i.e. severity levels, masking bits, and threshold
@@ -12,15 +13,6 @@
*
* Copyright 2009 Intel Corp.
* Author: Huang Ying <ying.huang@intel.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License version
- * 2 as published by the Free Software Foundation;
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/kernel.h>
@@ -32,6 +24,7 @@
#include <linux/io.h>
#include <linux/platform_device.h>
#include <acpi/apei.h>
+#include <acpi/ghes.h>
#include "apei-internal.h"
@@ -44,6 +37,20 @@ EXPORT_SYMBOL_GPL(hest_disable);
static struct acpi_table_hest *__read_mostly hest_tab;
+/*
+ * Since GHES_ASSIST is not supported, skip initialization of GHES_ASSIST
+ * structures for MCA.
+ * During HEST parsing, detected MCA error sources are cached from early
+ * table entries so that the Flags and Source Id fields from these cached
+ * values are then referred to in later table entries to determine if the
+ * encountered GHES_ASSIST structure should be initialized.
+ */
+static struct {
+ struct acpi_hest_ia_corrected *cmc;
+ struct acpi_hest_ia_machine_check *mc;
+ struct acpi_hest_ia_deferred_check *dmc;
+} mces;
+
static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
[ACPI_HEST_TYPE_IA32_CHECK] = -1, /* need further calculation */
[ACPI_HEST_TYPE_IA32_CORRECTED_CHECK] = -1,
@@ -53,8 +60,15 @@ static const int hest_esrc_len_tab[ACPI_HEST_TYPE_RESERVED] = {
[ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
[ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
[ACPI_HEST_TYPE_GENERIC_ERROR_V2] = sizeof(struct acpi_hest_generic_v2),
+ [ACPI_HEST_TYPE_IA32_DEFERRED_CHECK] = -1,
};
+static inline bool is_generic_error(struct acpi_hest_header *hest_hdr)
+{
+ return hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
+ hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2;
+}
+
static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
{
u16 hest_type = hest_hdr->type;
@@ -70,18 +84,57 @@ static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
len = sizeof(*cmc) + cmc->num_hardware_banks *
sizeof(struct acpi_hest_ia_error_bank);
+ mces.cmc = cmc;
} else if (hest_type == ACPI_HEST_TYPE_IA32_CHECK) {
struct acpi_hest_ia_machine_check *mc;
mc = (struct acpi_hest_ia_machine_check *)hest_hdr;
len = sizeof(*mc) + mc->num_hardware_banks *
sizeof(struct acpi_hest_ia_error_bank);
+ mces.mc = mc;
+ } else if (hest_type == ACPI_HEST_TYPE_IA32_DEFERRED_CHECK) {
+ struct acpi_hest_ia_deferred_check *mc;
+ mc = (struct acpi_hest_ia_deferred_check *)hest_hdr;
+ len = sizeof(*mc) + mc->num_hardware_banks *
+ sizeof(struct acpi_hest_ia_error_bank);
+ mces.dmc = mc;
}
BUG_ON(len == -1);
return len;
};
-int apei_hest_parse(apei_hest_func_t func, void *data)
+/*
+ * GHES and GHESv2 structures share the same format, starting from
+ * Source Id and ending in Error Status Block Length (inclusive).
+ */
+static bool is_ghes_assist_struct(struct acpi_hest_header *hest_hdr)
+{
+ struct acpi_hest_generic *ghes;
+ u16 related_source_id;
+
+ if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
+ hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
+ return false;
+
+ ghes = (struct acpi_hest_generic *)hest_hdr;
+ related_source_id = ghes->related_source_id;
+
+ if (mces.cmc && mces.cmc->flags & ACPI_HEST_GHES_ASSIST &&
+ related_source_id == mces.cmc->header.source_id)
+ return true;
+ if (mces.mc && mces.mc->flags & ACPI_HEST_GHES_ASSIST &&
+ related_source_id == mces.mc->header.source_id)
+ return true;
+ if (mces.dmc && mces.dmc->flags & ACPI_HEST_GHES_ASSIST &&
+ related_source_id == mces.dmc->header.source_id)
+ return true;
+
+ return false;
+}
+
+typedef int (*apei_hest_func_t)(struct acpi_hest_header *hest_hdr, void *data);
+
+static int apei_hest_parse(apei_hest_func_t func, void *data)
{
struct acpi_hest_header *hest_hdr;
int i, rc, len;
@@ -93,20 +146,25 @@ int apei_hest_parse(apei_hest_func_t func, void *data)
for (i = 0; i < hest_tab->error_source_count; i++) {
len = hest_esrc_len(hest_hdr);
if (!len) {
- pr_warning(FW_WARN HEST_PFX
- "Unknown or unused hardware error source "
- "type: %d for hardware error source: %d.\n",
- hest_hdr->type, hest_hdr->source_id);
+ pr_warn(FW_WARN HEST_PFX
+ "Unknown or unused hardware error source "
+ "type: %d for hardware error source: %d.\n",
+ hest_hdr->type, hest_hdr->source_id);
return -EINVAL;
}
if ((void *)hest_hdr + len >
(void *)hest_tab + hest_tab->header.length) {
- pr_warning(FW_BUG HEST_PFX
+ pr_warn(FW_BUG HEST_PFX
"Table contents overflow for hardware error source: %d.\n",
hest_hdr->source_id);
return -EINVAL;
}
+ if (is_ghes_assist_struct(hest_hdr)) {
+ hest_hdr = (void *)hest_hdr + len;
+ continue;
+ }
+
rc = func(hest_hdr, data);
if (rc)
return rc;
@@ -116,7 +174,6 @@ int apei_hest_parse(apei_hest_func_t func, void *data)
return 0;
}
-EXPORT_SYMBOL_GPL(apei_hest_parse);
/*
* Check if firmware advertises firmware first mode. We need FF bit to be set
@@ -142,8 +199,7 @@ static int __init hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void
{
int *count = data;
- if (hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR ||
- hest_hdr->type == ACPI_HEST_TYPE_GENERIC_ERROR_V2)
+ if (is_generic_error(hest_hdr))
(*count)++;
return 0;
}
@@ -154,8 +210,7 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
struct ghes_arr *ghes_arr = data;
int rc, i;
- if (hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR &&
- hest_hdr->type != ACPI_HEST_TYPE_GENERIC_ERROR_V2)
+ if (!is_generic_error(hest_hdr))
return 0;
if (!((struct acpi_hest_generic *)hest_hdr)->enabled)
@@ -165,8 +220,8 @@ static int __init hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)
ghes_dev = ghes_arr->ghes_devs[i];
hdr = *(struct acpi_hest_header **)ghes_dev->dev.platform_data;
if (hdr->source_id == hest_hdr->source_id) {
- pr_warning(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
- hdr->source_id);
+ pr_warn(FW_WARN HEST_PFX "Duplicated hardware error source ID: %d.\n",
+ hdr->source_id);
return -EIO;
}
}
@@ -203,6 +258,11 @@ static int __init hest_ghes_dev_register(unsigned int ghes_count)
rc = apei_hest_parse(hest_parse_ghes, &ghes_arr);
if (rc)
goto err;
+
+ rc = ghes_estatus_pool_init(ghes_count);
+ if (rc)
+ goto err;
+
out:
kfree(ghes_arr.ghes_devs);
return rc;
@@ -215,7 +275,7 @@ err:
static int __init setup_hest_disable(char *str)
{
hest_disable = HEST_DISABLED;
- return 0;
+ return 1;
}
__setup("hest_disable", setup_hest_disable);
@@ -223,7 +283,7 @@ __setup("hest_disable", setup_hest_disable);
void __init acpi_hest_init(void)
{
acpi_status status;
- int rc = -ENODEV;
+ int rc;
unsigned int ghes_count = 0;
if (hest_disable) {
@@ -239,8 +299,8 @@ void __init acpi_hest_init(void)
} else if (ACPI_FAILURE(status)) {
const char *msg = acpi_format_exception(status);
pr_err(HEST_PFX "Failed to get table, %s\n", msg);
- rc = -EINVAL;
- goto err;
+ hest_disable = HEST_DISABLED;
+ return;
}
rc = apei_hest_parse(hest_parse_cmc, NULL);
@@ -251,7 +311,9 @@ void __init acpi_hest_init(void)
rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);
if (rc)
goto err;
- rc = hest_ghes_dev_register(ghes_count);
+
+ if (ghes_count)
+ rc = hest_ghes_dev_register(ghes_count);
if (rc)
goto err;
}
@@ -260,4 +322,5 @@ void __init acpi_hest_init(void)
return;
err:
hest_disable = HEST_DISABLED;
+ acpi_put_table((struct acpi_table_header *)hest_tab);
}
generated by cgit (git 2.34.1) at 2025-12-25 02:39:59 +0000