Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c1c306344669ca40255e36192b101060ffbb1271
Commit: c1c306344669ca40255e36192b101060ffbb1271
Parent: d4d25deca49ec2527a634557bf5a6cf449f85deb
Author: Alexey Starikovskiy <[EMAIL PROTECTED]>
AuthorDate: Mon Nov 26 20:42:19 2007 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Mon Nov 26 20:42:19 2007 +0100
ACPI: Set max_cstate to 1 for early Opterons.
AMD Opteron processors before CG revision don't like C-states > 1.
This solves the long standing bugzilla #5303 and probably some more
on affected machines:
http://bugzilla.kernel.org/show_bug.cgi?id=5303
[ [EMAIL PROTECTED]: reworked the patch so it does not wreck ia64 ]
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
---
drivers/acpi/processor_idle.c | 1 +
include/asm-ia64/acpi.h | 1 +
include/asm-x86/acpi.h | 27 +++++++++++++++++++++++++++
3 files changed, 29 insertions(+), 0 deletions(-)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index f996d0e..b52109b 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -1658,6 +1658,7 @@ int __cpuinit acpi_processor_power_init(struct
acpi_processor *pr,
if (!first_run) {
dmi_check_system(processor_power_dmi_table);
+ max_cstate = acpi_processor_cstate_check(max_cstate);
if (max_cstate < ACPI_C_STATES_MAX)
printk(KERN_NOTICE
"ACPI: processor limited to max C-state %d\n",
diff --git a/include/asm-ia64/acpi.h b/include/asm-ia64/acpi.h
index 49730ff..81bcd5e 100644
--- a/include/asm-ia64/acpi.h
+++ b/include/asm-ia64/acpi.h
@@ -94,6 +94,7 @@ ia64_acpi_release_global_lock (unsigned int *lock)
#define acpi_noirq 0 /* ACPI always enabled on IA64 */
#define acpi_pci_disabled 0 /* ACPI PCI always enabled on IA64 */
#define acpi_strict 1 /* no ACPI spec workarounds on IA64 */
+#define acpi_processor_cstate_check(x) (x) /* no idle limits on IA64 :) */
static inline void disable_acpi(void) { }
const char *acpi_get_sysname (void);
diff --git a/include/asm-x86/acpi.h b/include/asm-x86/acpi.h
index 0693689..f8a8979 100644
--- a/include/asm-x86/acpi.h
+++ b/include/asm-x86/acpi.h
@@ -1,5 +1,32 @@
+#ifndef _ASM_X86_ACPI_H
+#define _ASM_X86_ACPI_H
+
#ifdef CONFIG_X86_32
# include "acpi_32.h"
#else
# include "acpi_64.h"
#endif
+
+#include <asm/processor.h>
+
+/*
+ * Check if the CPU can handle C2 and deeper
+ */
+static inline unsigned int acpi_processor_cstate_check(unsigned int max_cstate)
+{
+ /*
+ * Early models (<=5) of AMD Opterons are not supposed to go into
+ * C2 state.
+ *
+ * Steppings 0x0A and later are good
+ */
+ if (boot_cpu_data.x86 == 0x0F &&
+ boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+ boot_cpu_data.x86_model <= 0x05 &&
+ boot_cpu_data.x86_mask < 0x0A)
+ return 1;
+ else
+ return max_cstate;
+}
+
+#endif
-
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