1 files changed, 173 insertions, 0 deletions

diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
new file mode 100644
index 000000000000..e7f40d362cb3
--- /dev/null
+++ b/drivers/acpi/apei/hest.c
@@ -0,0 +1,173 @@
+/*
+ * APEI Hardware Error Souce Table support
+ *
+ * HEST describes error sources in detail; communicates operational
+ * parameters (i.e. severity levels, masking bits, and threshold
+ * values) to Linux as necessary. It also allows the BIOS to report
+ * non-standard error sources to Linux (for example, chipset-specific
+ * error registers).
+ *
+ * For more information about HEST, please refer to ACPI Specification
+ * version 4.0, section 17.3.2.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/acpi.h>
+#include <linux/kdebug.h>
+#include <linux/highmem.h>
+#include <linux/io.h>
+#include <acpi/apei.h>
+
+#include "apei-internal.h"
+
+#define HEST_PFX "HEST: "
+
+int hest_disable;
+EXPORT_SYMBOL_GPL(hest_disable);
+
+/* HEST table parsing */
+
+static struct acpi_table_hest *hest_tab;
+
+static int hest_void_parse(struct acpi_hest_header *hest_hdr, void *data)
+{
+        return 0;
+}
+
+static 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,
+        [ACPI_HEST_TYPE_IA32_NMI] = sizeof(struct acpi_hest_ia_nmi),
+        [ACPI_HEST_TYPE_AER_ROOT_PORT] = sizeof(struct acpi_hest_aer_root),
+        [ACPI_HEST_TYPE_AER_ENDPOINT] = sizeof(struct acpi_hest_aer),
+        [ACPI_HEST_TYPE_AER_BRIDGE] = sizeof(struct acpi_hest_aer_bridge),
+        [ACPI_HEST_TYPE_GENERIC_ERROR] = sizeof(struct acpi_hest_generic),
+};
+
+static int hest_esrc_len(struct acpi_hest_header *hest_hdr)
+{
+        u16 hest_type = hest_hdr->type;
+        int len;
+
+        if (hest_type >= ACPI_HEST_TYPE_RESERVED)
+                return 0;
+
+        len = hest_esrc_len_tab[hest_type];
+
+        if (hest_type == ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) {
+                struct acpi_hest_ia_corrected *cmc;
+                cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
+                len = sizeof(*cmc) + cmc->num_hardware_banks *
+                        sizeof(struct acpi_hest_ia_error_bank);
+        } 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);
+        }
+        BUG_ON(len == -1);
+
+        return len;
+};
+
+int apei_hest_parse(apei_hest_func_t func, void *data)
+{
+        struct acpi_hest_header *hest_hdr;
+        int i, rc, len;
+
+        if (hest_disable)
+                return -EINVAL;
+
+        hest_hdr = (struct acpi_hest_header *)(hest_tab + 1);
+        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);
+                        return -EINVAL;
+                }
+                if ((void *)hest_hdr + len >
+                    (void *)hest_tab + hest_tab->header.length) {
+                        pr_warning(FW_BUG HEST_PFX
+                "Table contents overflow for hardware error source: %d.\n",
+                                hest_hdr->source_id);
+                        return -EINVAL;
+                }
+
+                rc = func(hest_hdr, data);
+                if (rc)
+                        return rc;
+
+                hest_hdr = (void *)hest_hdr + len;
+        }
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(apei_hest_parse);
+
+static int __init setup_hest_disable(char *str)
+{
+        hest_disable = 1;
+        return 0;
+}
+
+__setup("hest_disable", setup_hest_disable);
+
+static int __init hest_init(void)
+{
+        acpi_status status;
+        int rc = -ENODEV;
+
+        if (acpi_disabled)
+                goto err;
+
+        if (hest_disable) {
+                pr_info(HEST_PFX "HEST tabling parsing is disabled.\n");
+                goto err;
+        }
+
+        status = acpi_get_table(ACPI_SIG_HEST, 0,
+                                (struct acpi_table_header **)&hest_tab);
+        if (status == AE_NOT_FOUND) {
+                pr_info(HEST_PFX "Table is not found!\n");
+                goto err;
+        } 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;
+        }
+
+        rc = apei_hest_parse(hest_void_parse, NULL);
+        if (rc)
+                goto err;
+
+        pr_info(HEST_PFX "HEST table parsing is initialized.\n");
+
+        return 0;
+err:
+        hest_disable = 1;
+        return rc;
+}
+
+subsys_initcall(hest_init);