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Message-ID: <866076.60576.qm@web50110.mail.re2.yahoo.com>
Date: Sun, 3 Jun 2007 08:11:02 -0700 (PDT)
From: Doug Thompson <norsk5@...oo.com>
To: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: [PATCH 12/36] drivers edac add nmi ecc harvesting
From: Dave Jiang <djiang@...sta.com>
Provides a way for NMI reported errors on x86 to notify the EDAC
subsystem pending ECC errors by writing to a software state variable.
Signed-off-by: Dave Jiang <djiang@...sta.com>
Signed-off-by: Douglas Thompson <dougthompson@...ssion.com>
---
Here's the reworked patch. I added an EDAC stub to the kernel so we can
have variables that are in the kernel even if EDAC is a module. I also
implemented the idea of using the chip driver to select error detection
mode via module parameter and eliminate the kernel compile option.
Please review/test. Thx!
Also, I only made changes to some of the chipset drivers since I am
unfamiliar with the other ones. We can add similar changes as we go.
arch/i386/kernel/traps.c | 12 ++++++++++++
arch/x86_64/kernel/traps.c | 11 +++++++++++
drivers/edac/Kconfig | 17 ++---------------
drivers/edac/Makefile | 1 +
drivers/edac/e752x_edac.c | 14 +++++++++++++-
drivers/edac/e7xxx_edac.c | 14 ++++++++++++++
drivers/edac/edac_mc.c | 4 +++-
drivers/edac/edac_module.c | 24 ++++++++++++++++++++++--
drivers/edac/edac_stub.c | 44
++++++++++++++++++++++++++++++++++++++++++++
drivers/edac/i5000_edac.c | 13 +++++++++++++
include/linux/edac.h | 29 +++++++++++++++++++++++++++++
11 files changed, 164 insertions(+), 19 deletions(-)
---
Index: linux-2.6.22-rc1/arch/i386/kernel/traps.c
===================================================================
--- linux-2.6.22-rc1.orig/arch/i386/kernel/traps.c
+++ linux-2.6.22-rc1/arch/i386/kernel/traps.c
@@ -41,6 +41,10 @@
#include <linux/mca.h>
#endif
+#if defined(CONFIG_EDAC)
+#include <linux/edac.h>
+#endif
+
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/io.h>
@@ -635,6 +639,14 @@ mem_parity_error(unsigned char reason, s
printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x on "
"CPU %d.\n", reason, smp_processor_id());
printk(KERN_EMERG "You have some hardware problem, likely on the PCI
bus.\n");
+
+#if defined(CONFIG_EDAC)
+ if(edac_handler_set()) {
+ edac_atomic_assert_error();
+ return;
+ }
+#endif
+
if (panic_on_unrecovered_nmi)
panic("NMI: Not continuing");
Index: linux-2.6.22-rc1/arch/x86_64/kernel/traps.c
===================================================================
--- linux-2.6.22-rc1.orig/arch/x86_64/kernel/traps.c
+++ linux-2.6.22-rc1/arch/x86_64/kernel/traps.c
@@ -34,6 +34,10 @@
#include <linux/bug.h>
#include <linux/kdebug.h>
+#if defined(CONFIG_EDAC)
+#include <linux/edac.h>
+#endif
+
#include <asm/system.h>
#include <asm/io.h>
#include <asm/atomic.h>
@@ -716,6 +720,13 @@ mem_parity_error(unsigned char reason, s
reason);
printk(KERN_EMERG "You have some hardware problem, likely on the PCI
bus.\n");
+#if defined(CONFIG_EDAC)
+ if(edac_handler_set()) {
+ edac_atomic_assert_error();
+ return;
+ }
+#endif
+
if (panic_on_unrecovered_nmi)
panic("NMI: Not continuing");
Index: linux-2.6.22-rc1/drivers/edac/edac_mc.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/edac_mc.c
+++ linux-2.6.22-rc1/drivers/edac/edac_mc.c
@@ -27,6 +27,7 @@
#include <linux/list.h>
#include <linux/sysdev.h>
#include <linux/ctype.h>
+#include <linux/edac.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/edac.h>
@@ -241,6 +242,7 @@ static int add_mc_to_global_list (struct
}
list_add_tail_rcu(&mci->link, insert_before);
+ atomic_inc(&edac_handlers);
return 0;
fail0:
@@ -267,6 +269,7 @@ static void complete_mc_list_del(struct
static void del_mc_from_global_list(struct mem_ctl_info *mci)
{
+ atomic_dec(&edac_handlers);
list_del_rcu(&mci->link);
init_completion(&mci->complete);
call_rcu(&mci->rcu, complete_mc_list_del);
Index: linux-2.6.22-rc1/drivers/edac/edac_module.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/edac_module.c
+++ linux-2.6.22-rc1/drivers/edac/edac_module.c
@@ -1,6 +1,7 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
+#include <linux/edac.h>
#include "edac_mc.h"
#include "edac_module.h"
@@ -102,6 +103,25 @@ static void do_edac_check(void)
}
/*
+ * handler for EDAC to check if NMI type handler has asserted
interrupt
+ */
+static int edac_assert_error_check_and_clear(void)
+{
+ int vreg;
+
+ if(edac_op_state == EDAC_OPSTATE_POLL)
+ return 1;
+
+ vreg = atomic_read(&edac_err_assert);
+ if(vreg) {
+ atomic_set(&edac_err_assert, 0);
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
* Action thread for EDAC to perform the POLL operations
*/
static int edac_kernel_thread(void *arg)
@@ -109,8 +129,8 @@ static int edac_kernel_thread(void *arg)
int msec;
while (!kthread_should_stop()) {
-
- do_edac_check();
+ if(edac_assert_error_check_and_clear())
+ do_edac_check();
/* goto sleep for the interval */
msec = (HZ * edac_get_poll_msec()) / 1000;
Index: linux-2.6.22-rc1/drivers/edac/Kconfig
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/Kconfig
+++ linux-2.6.22-rc1/drivers/edac/Kconfig
@@ -105,15 +105,4 @@ config EDAC_I5000
Support for error detection and correction the Intel
Greekcreek/Blackford chipsets.
-choice
- prompt "Error detecting method"
- default EDAC_POLL
-
-config EDAC_POLL
- bool "Poll for errors"
- help
- Poll the chipset periodically to detect errors.
-
-endchoice
-
endif # EDAC
Index: linux-2.6.22-rc1/include/linux/edac.h
===================================================================
--- /dev/null
+++ linux-2.6.22-rc1/include/linux/edac.h
@@ -0,0 +1,29 @@
+/*
+ * Generic EDAC defs
+ *
+ * Author: Dave Jiang <djiang@...sta.com>
+ *
+ * 2006-2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether
express
+ * or implied.
+ *
+ */
+#ifndef _LINUX_EDAC_H_
+#define _LINUX_EDAC_H_
+
+#include <asm/atomic.h>
+
+#define EDAC_OPSTATE_INVAL -1
+#define EDAC_OPSTATE_POLL 0
+#define EDAC_OPSTATE_NMI 1
+#define EDAC_OPSTATE_INT 2
+
+extern int edac_op_state;
+extern atomic_t edac_handlers;
+extern atomic_t edac_err_assert;
+
+extern int edac_handler_set(void);
+extern void edac_atomic_assert_error(void);
+
+#endif
Index: linux-2.6.22-rc1/drivers/edac/Makefile
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/Makefile
+++ linux-2.6.22-rc1/drivers/edac/Makefile
@@ -5,9 +5,9 @@
# This file may be distributed under the terms of the
# GNU General Public License.
#
-# $Id: Makefile,v 1.4.2.3 2005/07/08 22:05:38 dsp_llnl Exp $
+obj-$(CONFIG_EDAC) := edac_stub.o
obj-$(CONFIG_EDAC_MM_EDAC) += edac_core.o
edac_core-objs := edac_mc.o edac_device.o edac_mc_sysfs.o
edac_pci_sysfs.o
Index: linux-2.6.22-rc1/drivers/edac/edac_stub.c
===================================================================
--- /dev/null
+++ linux-2.6.22-rc1/drivers/edac/edac_stub.c
@@ -0,0 +1,42 @@
+/*
+ * common EDAC components that must be in kernel
+ *
+ * Author: Dave Jiang <djiang@...sta.com>
+ *
+ * 2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether
express
+ * or implied.
+ *
+ */
+#include <linux/module.h>
+#include <linux/edac.h>
+#include <asm/atomic.h>
+#include <asm/edac.h>
+
+int edac_op_state = EDAC_OPSTATE_INVAL;
+EXPORT_SYMBOL(edac_op_state);
+
+atomic_t edac_handlers = ATOMIC_INIT(0);
+EXPORT_SYMBOL(edac_handlers);
+
+atomic_t edac_err_assert = ATOMIC_INIT(0);
+EXPORT_SYMBOL(edac_err_assert);
+
+inline int edac_handler_set(void)
+{
+ if (edac_op_state == EDAC_OPSTATE_POLL)
+ return 0;
+
+ return atomic_read(&edac_handlers);
+}
+EXPORT_SYMBOL(edac_handler_set);
+
+/*
+ * handler for NMI type of interrupts to assert error
+ */
+inline void edac_atomic_assert_error(void)
+{
+ atomic_set(&edac_err_assert, 1);
+}
+EXPORT_SYMBOL(edac_atomic_assert_error);
Index: linux-2.6.22-rc1/drivers/edac/e752x_edac.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/e752x_edac.c
+++ linux-2.6.22-rc1/drivers/edac/e752x_edac.c
@@ -22,6 +22,7 @@
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
+#include <linux/edac.h>
#include "edac_mc.h"
#define E752X_REVISION " Ver: 2.0.1 " __DATE__
@@ -948,6 +949,16 @@ static int e752x_probe1(struct pci_dev *
debugf0("%s(): mci\n", __func__);
debugf0("Starting Probe1\n");
+ /* make sure error reporting method is sane */
+ switch(edac_op_state) {
+ case EDAC_OPSTATE_POLL:
+ case EDAC_OPSTATE_NMI:
+ break;
+ default:
+ edac_op_state = EDAC_OPSTATE_POLL;
+ break;
+ }
+
/* check to see if device 0 function 1 is enabled; if it isn't, we
* assume the BIOS has reserved it for a reason and is expecting
* exclusive access, we take care not to violate that assumption and
@@ -1123,4 +1134,5 @@ MODULE_DESCRIPTION("MC support for Intel
module_param(force_function_unhide, int, 0444);
MODULE_PARM_DESC(force_function_unhide, "if BIOS sets Dev0:Fun1 up as
hidden:"
" 1=force unhide and hope BIOS doesn't fight driver for Dev0:Fun1
access");
-
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state:
0=Poll,1=NMI");
Index: linux-2.6.22-rc1/drivers/edac/e7xxx_edac.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/e7xxx_edac.c
+++ linux-2.6.22-rc1/drivers/edac/e7xxx_edac.c
@@ -27,6 +27,7 @@
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
+#include <linux/edac.h>
#include "edac_mc.h"
#define E7XXX_REVISION " Ver: 2.0.1 " __DATE__
@@ -419,6 +420,17 @@ static int e7xxx_probe1(struct pci_dev *
struct e7xxx_error_info discard;
debugf0("%s(): mci\n", __func__);
+
+ /* make sure error reporting method is sane */
+ switch(edac_op_state) {
+ case EDAC_OPSTATE_POLL:
+ case EDAC_OPSTATE_NMI:
+ break;
+ default:
+ edac_op_state = EDAC_OPSTATE_POLL;
+ break;
+ }
+
pci_read_config_dword(pdev, E7XXX_DRC, &drc);
drc_chan = dual_channel_active(drc, dev_idx);
@@ -565,3 +577,5 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh et
al\n"
"Based on.work by Dan Hollis et al");
MODULE_DESCRIPTION("MC support for Intel e7xxx memory controllers");
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state:
0=Poll,1=NMI");
Index: linux-2.6.22-rc1/drivers/edac/i5000_edac.c
===================================================================
--- linux-2.6.22-rc1.orig/drivers/edac/i5000_edac.c
+++ linux-2.6.22-rc1/drivers/edac/i5000_edac.c
@@ -19,6 +19,7 @@
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
+#include <linux/edac.h>
#include <asm/mmzone.h>
#include "edac_mc.h"
@@ -1285,6 +1286,16 @@ static int i5000_probe1(struct pci_dev *
if (PCI_FUNC(pdev->devfn) != 0)
return -ENODEV;
+ /* make sure error reporting method is sane */
+ switch(edac_op_state) {
+ case EDAC_OPSTATE_POLL:
+ case EDAC_OPSTATE_NMI:
+ break;
+ default:
+ edac_op_state = EDAC_OPSTATE_POLL;
+ break;
+ }
+
/* Ask the devices for the number of CSROWS and CHANNELS so
* that we can calculate the memory resources, etc
*
@@ -1475,3 +1486,5 @@ MODULE_AUTHOR
("Linux Networx (http://lnxi.com) Doug Thompson
<norsk5@...ssion.com>");
MODULE_DESCRIPTION("MC Driver for Intel I5000 memory controllers - "
I5000_REVISION);
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state:
0=Poll,1=NMI");
-
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