Hi Huaxu,
> The thermal sensors of Intel(R) CPUs can be detected by CPUID instruction,
> indicated by CPUID.06H.EAX[0].
Thanks, works great, successfully tested it on an i7 machine.
I would propose to use dev_warn() instead of printk_once(), since all
other per-cpu info is also logged this way.
Signed-off-by: Carsten Emde <C.Emde@xxxxxxxxx>
---
drivers/hwmon/coretemp.c | 23 +++++++----------------
1 file changed, 7 insertions(+), 16 deletions(-)
Index: head/drivers/hwmon/coretemp.c
===================================================================
--- head.orig/drivers/hwmon/coretemp.c
+++ head/drivers/hwmon/coretemp.c
@@ -440,6 +440,7 @@ static int __init coretemp_init(void)
{
int i, err = -ENODEV;
struct pdev_entry *p, *n;
+ u32 eax;
/* quick check if we run Intel */
if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
@@ -450,23 +451,13 @@ static int __init coretemp_init(void)
goto exit;
for_each_online_cpu(i) {
- struct cpuinfo_x86 *c = &cpu_data(i);
+ /* check if the CPU has thermal sensor */
+ eax = cpuid_eax(0x06);
+ if (!(eax & 0x01)) {
+ struct cpuinfo_x86 *c = &cpu_data(i);
- /* check if family 6, models 0xe (Pentium M DC),
- 0xf (Core 2 DC 65nm), 0x16 (Core 2 SC 65nm),
- 0x17 (Penryn 45nm), 0x1a (Nehalem), 0x1c (Atom),
- 0x1e (Lynnfield) */
- if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
- !((c->x86_model == 0xe) || (c->x86_model == 0xf) ||
- (c->x86_model == 0x16) || (c->x86_model == 0x17) ||
- (c->x86_model == 0x1a) || (c->x86_model == 0x1c) ||
- (c->x86_model == 0x1e))) {
-
- /* supported CPU not found, but report the unknown
- family 6 CPU */
- if ((c->x86 == 0x6) && (c->x86_model > 0xf))
- printk(KERN_WARNING DRVNAME ": Unknown CPU "
- "model 0x%x\n", c->x86_model);
+ dev_warn("CPU (model=0x%x) has no thermal sensor!\n",
+ c->x86_model);
continue;
}
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