ACPI, APEI, ERST debug support

This patch adds debugging/testing support to ERST. A misc device is
implemented to export raw ERST read/write/clear etc operations to user
space. With this patch, we can add ERST testing support to
linuxfirmwarekit ISO (linuxfirmwarekit.org) to verify the kernel
support and the firmware implementation.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

3 files changed, 217 insertions, 0 deletions

diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index f8c668f27b5a..907e350f1c7d 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -28,3 +28,12 @@ config ACPI_APEI_EINJ
           EINJ provides a hardware error injection mechanism, it is
           mainly used for debugging and testing the other parts of
           APEI and some other RAS features.
+
+config ACPI_APEI_ERST_DEBUG
+        tristate "APEI Error Record Serialization Table (ERST) Debug Support"
+        depends on ACPI_APEI
+        help
+          ERST is a way provided by APEI to save and retrieve hardware
+          error infomation to and from a persistent store. Enable this
+          if you want to debugging and testing the ERST kernel support
+          and firmware implementation.
diff --git a/drivers/acpi/apei/Makefile b/drivers/acpi/apei/Makefile
index b13b03a17789..d1d1bc0a4ee1 100644
--- a/drivers/acpi/apei/Makefile
+++ b/drivers/acpi/apei/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_ACPI_APEI)         += apei.o
 obj-$(CONFIG_ACPI_APEI_GHES)    += ghes.o
 obj-$(CONFIG_ACPI_APEI_EINJ)    += einj.o
+obj-$(CONFIG_ACPI_APEI_ERST_DEBUG) += erst-dbg.o
 
 apei-y := apei-base.o hest.o cper.o erst.o
diff --git a/drivers/acpi/apei/erst-dbg.c b/drivers/acpi/apei/erst-dbg.c
new file mode 100644
index 000000000000..5281ddda2777
--- /dev/null
+++ b/drivers/acpi/apei/erst-dbg.c
@@ -0,0 +1,207 @@
+/*
+ * APEI Error Record Serialization Table debug support
+ *
+ * ERST is a way provided by APEI to save and retrieve hardware error
+ * infomation to and from a persistent store. This file provide the
+ * debugging/testing support for ERST kernel support and firmware
+ * implementation.
+ *
+ * Copyright 2010 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/uaccess.h>
+#include <acpi/apei.h>
+#include <linux/miscdevice.h>
+
+#include "apei-internal.h"
+
+#define ERST_DBG_PFX                    "ERST DBG: "
+
+#define ERST_DBG_RECORD_LEN_MAX         4096
+
+static void *erst_dbg_buf;
+static unsigned int erst_dbg_buf_len;
+
+/* Prevent erst_dbg_read/write from being invoked concurrently */
+static DEFINE_MUTEX(erst_dbg_mutex);
+
+static int erst_dbg_open(struct inode *inode, struct file *file)
+{
+        if (erst_disable)
+                return -ENODEV;
+
+        return nonseekable_open(inode, file);
+}
+
+static long erst_dbg_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
+{
+        int rc;
+        u64 record_id;
+        u32 record_count;
+
+        switch (cmd) {
+        case APEI_ERST_CLEAR_RECORD:
+                rc = copy_from_user(&record_id, (void __user *)arg,
+                                    sizeof(record_id));
+                if (rc)
+                        return -EFAULT;
+                return erst_clear(record_id);
+        case APEI_ERST_GET_RECORD_COUNT:
+                rc = erst_get_record_count();
+                if (rc < 0)
+                        return rc;
+                record_count = rc;
+                rc = put_user(record_count, (u32 __user *)arg);
+                if (rc)
+                        return rc;
+                return 0;
+        default:
+                return -ENOTTY;
+        }
+}
+
+static ssize_t erst_dbg_read(struct file *filp, char __user *ubuf,
+                             size_t usize, loff_t *off)
+{
+        int rc;
+        ssize_t len = 0;
+        u64 id;
+
+        if (*off != 0)
+                return -EINVAL;
+
+        if (mutex_lock_interruptible(&erst_dbg_mutex) != 0)
+                return -EINTR;
+
+retry_next:
+        rc = erst_get_next_record_id(&id);
+        if (rc)
+                goto out;
+        /* no more record */
+        if (id == APEI_ERST_INVALID_RECORD_ID)
+                goto out;
+retry:
+        rc = len = erst_read(id, erst_dbg_buf, erst_dbg_buf_len);
+        /* The record may be cleared by others, try read next record */
+        if (rc == -ENOENT)
+                goto retry_next;
+        if (rc < 0)
+                goto out;
+        if (len > ERST_DBG_RECORD_LEN_MAX) {
+                pr_warning(ERST_DBG_PFX
+                           "Record (ID: 0x%llx) length is too long: %zd\n",
+                           id, len);
+                rc = -EIO;
+                goto out;
+        }
+        if (len > erst_dbg_buf_len) {
+                kfree(erst_dbg_buf);
+                rc = -ENOMEM;
+                erst_dbg_buf = kmalloc(len, GFP_KERNEL);
+                if (!erst_dbg_buf)
+                        goto out;
+                erst_dbg_buf_len = len;
+                goto retry;
+        }
+
+        rc = -EINVAL;
+        if (len > usize)
+                goto out;
+
+        rc = -EFAULT;
+        if (copy_to_user(ubuf, erst_dbg_buf, len))
+                goto out;
+        rc = 0;
+out:
+        mutex_unlock(&erst_dbg_mutex);
+        return rc ? rc : len;
+}
+
+static ssize_t erst_dbg_write(struct file *filp, const char __user *ubuf,
+                              size_t usize, loff_t *off)
+{
+        int rc;
+        struct cper_record_header *rcd;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        if (usize > ERST_DBG_RECORD_LEN_MAX) {
+                pr_err(ERST_DBG_PFX "Too long record to be written\n");
+                return -EINVAL;
+        }
+
+        if (mutex_lock_interruptible(&erst_dbg_mutex))
+                return -EINTR;
+        if (usize > erst_dbg_buf_len) {
+                kfree(erst_dbg_buf);
+                rc = -ENOMEM;
+                erst_dbg_buf = kmalloc(usize, GFP_KERNEL);
+                if (!erst_dbg_buf)
+                        goto out;
+                erst_dbg_buf_len = usize;
+        }
+        rc = copy_from_user(erst_dbg_buf, ubuf, usize);
+        if (rc) {
+                rc = -EFAULT;
+                goto out;
+        }
+        rcd = erst_dbg_buf;
+        rc = -EINVAL;
+        if (rcd->record_length != usize)
+                goto out;
+
+        rc = erst_write(erst_dbg_buf);
+
+out:
+        mutex_unlock(&erst_dbg_mutex);
+        return rc < 0 ? rc : usize;
+}
+
+static const struct file_operations erst_dbg_ops = {
+        .owner          = THIS_MODULE,
+        .open           = erst_dbg_open,
+        .read           = erst_dbg_read,
+        .write          = erst_dbg_write,
+        .unlocked_ioctl = erst_dbg_ioctl,
+};
+
+static struct miscdevice erst_dbg_dev = {
+        .minor  = MISC_DYNAMIC_MINOR,
+        .name   = "erst_dbg",
+        .fops   = &erst_dbg_ops,
+};
+
+static __init int erst_dbg_init(void)
+{
+        return misc_register(&erst_dbg_dev);
+}
+
+static __exit void erst_dbg_exit(void)
+{
+        misc_deregister(&erst_dbg_dev);
+        kfree(erst_dbg_buf);
+}
+
+module_init(erst_dbg_init);
+module_exit(erst_dbg_exit);
+
+MODULE_AUTHOR("Huang Ying");
+MODULE_DESCRIPTION("APEI Error Record Serialization Table debug support");
+MODULE_LICENSE("GPL");