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From: mark gross <mgross@linux.intel.com>
To: speck@linutronix.de
Subject: [MODERATED] [PATCH 1/4] V8 more sampling fun 1
Date: Mon, 16 Mar 2020 17:56:27 -0700	[thread overview]
Message-ID: <=?utf-8?q?=3Cb715c51b0ad67b00fc47298f722d7bb742f529f2=2E158699?= =?utf-8?q?6075=2Egit=2Emgross=40linux=2Eintel=2Ecom=3E?=> (raw)
In-Reply-To: <cover.1586996075.git.mgross@linux.intel.com>

From: mark gross <mgross@linux.intel.com>
Subject: [PATCH 1/4] x86/cpu: Add stepping field to x86_cpu_id structure

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 steppings bitmask to
x86_cpu_id and X86_MATCH_VENDOR_FAMILY_MODEL_STEPPING_FEATURE macro and
support for matching against family/model/stepping.

Signed-off-by: Mark Gross <mgross@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
 arch/x86/include/asm/cpu_device_id.h | 27 ++++++++++++++++++++++++---
 arch/x86/kernel/cpu/match.c          |  7 ++++++-
 include/linux/mod_devicetable.h      |  2 ++
 3 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index cf3d621c6892..10426cd56dca 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -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
diff --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c
index d3482eb43ff3..ad6776081e60 100644
--- a/arch/x86/kernel/cpu/match.c
+++ b/arch/x86/kernel/cpu/match.c
@@ -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;
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 4c2ddd0941a7..0754b8d71262 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -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 */
 
 /*
-- 
2.17.1

  parent reply	other threads:[~2020-04-16  0:22 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-16  0:14 [MODERATED] [PATCH 0/4] V8 more sampling fun 0 mark gross
2020-01-16 22:16 ` [MODERATED] [PATCH 3/4] V8 more sampling fun 3 mark gross
2020-01-30 19:12 ` [MODERATED] [PATCH 4/4] V8 more sampling fun 4 mark gross
2020-03-17  0:56 ` mark gross [this message]
2020-03-17  0:56 ` [MODERATED] [PATCH 2/4] V8 more sampling fun 2 mark gross
2020-04-16 17:15 ` [MODERATED] Re: [PATCH 1/4] V8 more sampling fun 1 Josh Poimboeuf
2020-04-16 17:30   ` Borislav Petkov
2020-04-16 17:16 ` [MODERATED] Re: [PATCH 2/4] V8 more sampling fun 2 Josh Poimboeuf
2020-04-16 17:33   ` [MODERATED] " Borislav Petkov
2020-04-16 22:47     ` mark gross
2020-04-16 17:17 ` [MODERATED] Re: [PATCH 3/4] V8 more sampling fun 3 Josh Poimboeuf
2020-04-16 17:44   ` Borislav Petkov
2020-04-16 18:01     ` Josh Poimboeuf
2020-04-16 22:45       ` mark gross
2020-04-16 22:57     ` mark gross
2020-04-17 12:34     ` Thomas Gleixner
2020-04-17 13:19       ` [MODERATED] " Josh Poimboeuf
2020-04-17 16:46         ` Luck, Tony
2020-04-17 19:22         ` Thomas Gleixner
2020-04-16 22:54   ` [MODERATED] " mark gross
2020-04-16 17:20 ` [MODERATED] Re: [PATCH 4/4] V8 more sampling fun 4 Josh Poimboeuf
2020-04-16 17:49   ` [MODERATED] " Borislav Petkov
2020-04-16 22:57     ` mark gross
2020-04-20 14:30     ` mark gross
2020-04-20 16:17       ` Thomas Gleixner
2020-04-20 22:30         ` [MODERATED] " mark gross
2020-04-20 21:45       ` Slow Randomizing Boosts Denial of Service - Bulletin #1 Thomas Gleixner
2020-04-23 21:35         ` [MODERATED] " mark gross
2020-04-24  7:01           ` Greg KH
2020-04-27 15:10             ` mark gross
2020-04-21 17:30 ` [MODERATED] Re: [PATCH 4/4] V8 more sampling fun 4 Borislav Petkov
2020-04-21 17:34   ` Andrew Cooper
2020-04-21 18:19     ` Borislav Petkov

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