lkml.org 
[lkml]   [2011]   [May]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/4] EDAC, MCE, AMD: Add function to enable direct write to MCE MSRs
Date
From: Borislav Petkov <borislav.petkov@amd.com>

Normally, writing to MCE MSRs causes a #GP. Add a function to enable
direct access to those MSRs.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
drivers/edac/mce_amd_inj.c | 24 ++++++++++++++++++++++++
1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c
index a4987e0..eb36e15 100644
--- a/drivers/edac/mce_amd_inj.c
+++ b/drivers/edac/mce_amd_inj.c
@@ -30,6 +30,30 @@ static struct edac_mce_attr mce_attr_##_name = __ATTR(_name, _mode, _show, _stor
static struct kobject *mce_kobj;

/*
+ * Caller needs to be make sure this cpu doesn't disappear
+ * from under us, i.e.: get_cpu/put_cpu.
+ */
+static int toggle_hw_mce_inject(unsigned int cpu, bool enable)
+{
+ u32 l, h;
+ int err;
+
+ err = rdmsr_on_cpu(cpu, MSR_K7_HWCR, &l, &h);
+ if (err) {
+ printk(KERN_ERR "%s: error reading HWCR\n", __func__);
+ return err;
+ }
+
+ enable ? (l |= BIT(18)) : (l &= ~BIT(18));
+
+ err = wrmsr_on_cpu(cpu, MSR_K7_HWCR, l, h);
+ if (err)
+ printk(KERN_ERR "%s: error writing HWCR\n", __func__);
+
+ return err;
+}
+
+/*
* Collect all the MCi_XXX settings
*/
static struct mce i_mce;
--
1.7.4.rc2


\
 
 \ /
  Last update: 2011-05-05 18:53    [W:0.057 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site