cpufreq: Add support for x86 cpuinfo auto loading v4

This marks all the x86 cpuinfo tables to the CPU specific device drivers,
to allow auto loading by udev. This should simplify the distribution
startup scripts for this greatly.

I didn't add MODULE_DEVICE_IDs to the centrino and p4-clockmod drivers,
because those probably shouldn't be auto loaded and the acpi driver
be used instead (not fully sure on that, would appreciate feedback)

The old nforce drivers autoload based on the PCI ID.

ACPI cpufreq is autoloaded in another patch.

v3: Autoload gx based on PCI IDs only. Remove cpu check (Dave Jones)
v4: Use newly introduce HW_PSTATE feature for powernow-k8 loading

Cc: Dave Jones <davej@redhat.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/cpufreq/p4-clockmod.c b/drivers/cpufreq/p4-clockmod.c
index 6be3e0760c26..827629c9aad7 100644
--- a/drivers/cpufreq/p4-clockmod.c
+++ b/drivers/cpufreq/p4-clockmod.c
@@ -31,6 +31,7 @@
 #include <asm/processor.h>
 #include <asm/msr.h>
 #include <asm/timer.h>
+#include <asm/cpu_device_id.h>
 
 #include "speedstep-lib.h"
 
@@ -289,21 +290,25 @@ static struct cpufreq_driver p4clockmod_driver = {
         .attr           = p4clockmod_attr,
 };
 
+static const struct x86_cpu_id cpufreq_p4_id[] = {
+        { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_ACC },
+        {}
+};
+
+/*
+ * Intentionally no MODULE_DEVICE_TABLE here: this driver should not
+ * be auto loaded.  Please don't add one.
+ */
 
 static int __init cpufreq_p4_init(void)
 {
-        struct cpuinfo_x86 *c = &cpu_data(0);
         int ret;
 
         /*
          * THERM_CONTROL is architectural for IA32 now, so
          * we can rely on the capability checks
          */
-        if (c->x86_vendor != X86_VENDOR_INTEL)
-                return -ENODEV;
-
-        if (!test_cpu_cap(c, X86_FEATURE_ACPI) ||
-                                !test_cpu_cap(c, X86_FEATURE_ACC))
+        if (!x86_match_cpu(cpufreq_p4_id) || !boot_cpu_has(X86_FEATURE_ACPI))
                 return -ENODEV;
 
         ret = cpufreq_register_driver(&p4clockmod_driver);