UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86/cpu: Add a steppings field to struct x86_cpu_id 

Intel uses the same family/model for several CPUs. Sometimes the
stepping must be checked to tell them apart.

On x86 there can be at most 16 steppings. Add a steppings bitmask to
x86_cpu_id and a X86_MATCH_VENDOR_FAMILY_MODEL_STEPPING_FEATURE macro
and support for matching against family/model/stepping.

 [ bp: Massage. ]

Signed-off-by: Mark Gross <mgross@linux.intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
This commit is contained in:
Mark Gross 2020-04-16 17:23:10 +02:00 committed by Thomas Gleixner
parent ae83d0b416
commit e9d7144597
3 changed files with 32 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
arch/x86/include/asm/cpu_device_id.h
View File

@ -20,12 +20,14 @@
#define X86_CENTAUR_FAM6_C7_D 0xd
#define X86_CENTAUR_FAM6_NANO 0xf
#define X86_STEPPINGS(mins, maxs) GENMASK(maxs, mins)
/**
* X86_MATCH_VENDOR_FAM_MODEL_FEATURE - Base macro for CPU matching
* X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE - Base macro for CPU matching
* @_vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY
* The name is expanded to X86_VENDOR_@_vendor
* @_family: The family number or X86_FAMILY_ANY
* @_model: The model number, model constant or X86_MODEL_ANY
* @_steppings: Bitmask for steppings, stepping constant or X86_STEPPING_ANY
* @_feature: A X86_FEATURE bit or X86_FEATURE_ANY
* @_data: Driver specific data or NULL. The internal storage
* format is unsigned long. The supplied value, pointer
@ -37,15 +39,34 @@
* into another macro at the usage site for good reasons, then please
* start this local macro with X86_MATCH to allow easy grepping.
*/
#define X86_MATCH_VENDOR_FAM_MODEL_FEATURE(_vendor, _family, _model, \
_feature, _data) { \
#define X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(_vendor, _family, _model, \
_steppings, _feature, _data) { \
.vendor = X86_VENDOR_##_vendor, \
.family = _family, \
.model = _model, \
.steppings = _steppings, \
.feature = _feature, \
.driver_data = (unsigned long) _data \
}
/**
* X86_MATCH_VENDOR_FAM_MODEL_FEATURE - Macro for CPU matching
* @_vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY
* The name is expanded to X86_VENDOR_@_vendor
* @_family: The family number or X86_FAMILY_ANY
* @_model: The model number, model constant or X86_MODEL_ANY
* @_feature: A X86_FEATURE bit or X86_FEATURE_ANY
* @_data: Driver specific data or NULL. The internal storage
* format is unsigned long. The supplied value, pointer
* etc. is casted to unsigned long internally.
*
* The steppings arguments of X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE() is
* set to wildcards.
*/
#define X86_MATCH_VENDOR_FAM_MODEL_FEATURE(vendor, family, model, feature, data) \
X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(vendor, family, model, \
X86_STEPPING_ANY, feature, data)
/**
* X86_MATCH_VENDOR_FAM_FEATURE - Macro for matching vendor, family and CPU feature
* @vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY

7
arch/x86/kernel/cpu/match.c
View File

@ -39,13 +39,18 @@ const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match)
const struct x86_cpu_id *m;
struct cpuinfo_x86 *c = &boot_cpu_data;
for (m = match; m->vendor | m->family | m->model | m->feature; m++) {
for (m = match;
m->vendor | m->family | m->model | m->steppings | m->feature;
m++) {
if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor)
continue;
if (m->family != X86_FAMILY_ANY && c->x86 != m->family)
continue;
if (m->model != X86_MODEL_ANY && c->x86_model != m->model)
continue;
if (m->steppings != X86_STEPPING_ANY &&
!(BIT(c->x86_stepping) & m->steppings))
continue;
if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature))
continue;
return m;

2
include/linux/mod_devicetable.h
View File

@ -663,6 +663,7 @@ struct x86_cpu_id {
__u16 vendor;
__u16 family;
__u16 model;
__u16 steppings;
__u16 feature; /* bit index */
kernel_ulong_t driver_data;
};
@ -671,6 +672,7 @@ struct x86_cpu_id {
#define X86_VENDOR_ANY 0xffff
#define X86_FAMILY_ANY 0
#define X86_MODEL_ANY 0
#define X86_STEPPING_ANY 0
#define X86_FEATURE_ANY 0 /* Same as FPU, you can't test for that */
/*