lkml.org 
[lkml]   [2015]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] x86: correct saving and restoring of lapic vectors in suspend/resume
Date
Saving and restoring lapic vectors in lapic_suspend() and
lapic_resume() is not consistent: the thmr vector saving is guarded
by a different config option than the restore part. The cmci vector
isn't handled at all.

Those inconsistencies are not very critical, as the missing cmci
vector will be set via mce resume handling, the wrong config option
used for restoring the thmr vector can't be configured differently
than the one which should be used.

Nevertheless correct the thmr vector restore and add cmci vector
handling.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/kernel/apic/apic.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 2f69e3b..bc06c9d 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -2270,6 +2270,7 @@ static struct {
unsigned int apic_tmict;
unsigned int apic_tdcr;
unsigned int apic_thmr;
+ unsigned int apic_cmci;
} apic_pm_state;

static int lapic_suspend(void)
@@ -2299,6 +2300,10 @@ static int lapic_suspend(void)
if (maxlvt >= 5)
apic_pm_state.apic_thmr = apic_read(APIC_LVTTHMR);
#endif
+#ifdef CONFIG_X86_MCE_INTEL
+ if (maxlvt >= 6)
+ apic_pm_state.apic_cmci = apic_read(APIC_LVTCMCI);
+#endif

local_irq_save(flags);
disable_local_APIC();
@@ -2355,10 +2360,14 @@ static void lapic_resume(void)
apic_write(APIC_SPIV, apic_pm_state.apic_spiv);
apic_write(APIC_LVT0, apic_pm_state.apic_lvt0);
apic_write(APIC_LVT1, apic_pm_state.apic_lvt1);
-#if defined(CONFIG_X86_MCE_INTEL)
+#if defined(CONFIG_X86_THERMAL_VECTOR)
if (maxlvt >= 5)
apic_write(APIC_LVTTHMR, apic_pm_state.apic_thmr);
#endif
+#if defined(CONFIG_X86_MCE_INTEL)
+ if (maxlvt >= 6)
+ apic_write(APIC_LVTCMCI, apic_pm_state.apic_cmci);
+#endif
if (maxlvt >= 4)
apic_write(APIC_LVTPC, apic_pm_state.apic_lvtpc);
apic_write(APIC_LVTT, apic_pm_state.apic_lvtt);
--
2.6.2


\
 
 \ /
  Last update: 2015-11-23 12:21    [W:0.069 / U:0.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site