[PATCH 0/3] x86/cpu: More macros cleanup

[PATCH 0/3] x86/cpu: More macros cleanup

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

Hi all,

here are some more cleanups ontop of tglx's x86 CPU macros cleanup
series.

Thx.

Borislav Petkov (2):
  x86/cpu: Add a X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS() macro
  x86/apic: Convert the TSC deadline timer matching to steppings macro

Mark Gross (1):
  x86/cpu: Add a steppings field to struct x86_cpu_id

 arch/x86/include/asm/cpu_device_id.h | 31 +++++++++++++--
 arch/x86/kernel/apic/apic.c          | 57 ++++++----------------------
 arch/x86/kernel/cpu/match.c          |  7 +++-
 include/linux/mod_devicetable.h      |  2 +
 4 files changed, 48 insertions(+), 49 deletions(-)

-- 
2.21.0

[PATCH 1/3] x86/cpu: Add a steppings field to struct x86_cpu_id

[Borislav Petkov]

From: Mark Gross <mgross@linux.intel.com>

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>
---
 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 */
 
 /*
-- 
2.21.0

Re: [PATCH 1/3] x86/cpu: Add a steppings field to struct x86_cpu_id

[mark gross]

+1

--mark

On Wed, May 06, 2020 at 09:15:14AM +0200, Borislav Petkov wrote:
> From: Mark Gross <mgross@linux.intel.com>
> 
> 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>
> ---
>  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 */
>  
>  /*
> -- 
> 2.21.0
> 

[PATCH 2/3] x86/cpu: Add a X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS() macro

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

... to match Intel family 6 CPUs with steppings.

Signed-off-by: Borislav Petkov <bp@suse.de>
---
 arch/x86/include/asm/cpu_device_id.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index 10426cd56dca..eb8fcede9e3b 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -160,6 +160,10 @@
 #define X86_MATCH_INTEL_FAM6_MODEL(model, data)				\
 	X86_MATCH_VENDOR_FAM_MODEL(INTEL, 6, INTEL_FAM6_##model, data)
 
+#define X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(model, steppings, data)	\
+	X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
+						     steppings, X86_FEATURE_ANY, data)
+
 /*
  * Match specific microcode revisions.
  *
-- 
2.21.0

Re: [PATCH 2/3] x86/cpu: Add a X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS() macro

[mark gross]

Reviewed-by: Mark Gross <mgross@linux.intel.com>


On Wed, May 06, 2020 at 09:15:15AM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
> 
> ... to match Intel family 6 CPUs with steppings.
> 
> Signed-off-by: Borislav Petkov <bp@suse.de>
> ---
>  arch/x86/include/asm/cpu_device_id.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
> index 10426cd56dca..eb8fcede9e3b 100644
> --- a/arch/x86/include/asm/cpu_device_id.h
> +++ b/arch/x86/include/asm/cpu_device_id.h
> @@ -160,6 +160,10 @@
>  #define X86_MATCH_INTEL_FAM6_MODEL(model, data)				\
>  	X86_MATCH_VENDOR_FAM_MODEL(INTEL, 6, INTEL_FAM6_##model, data)
>  
> +#define X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(model, steppings, data)	\
> +	X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
> +						     steppings, X86_FEATURE_ANY, data)
> +
>  /*
>   * Match specific microcode revisions.
>   *
> -- 
> 2.21.0
> 

[tip: x86/cpu] x86/cpu: Add a X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS() macro

[tip-bot2 for Borislav Petkov]

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     d8422f6bb052b44db923a28afd8ceaef63d38d26
Gitweb:        https://git.kernel.org/tip/d8422f6bb052b44db923a28afd8ceaef63d38d26
Author:        Borislav Petkov <bp@suse.de>
AuthorDate:    Tue, 05 May 2020 19:25:08 +02:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 07 May 2020 13:48:05 +02:00

x86/cpu: Add a X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS() macro

... to match Intel family 6 CPUs with steppings.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mark Gross <mgross@linux.intel.com>
Link: https://lkml.kernel.org/r/20200506071516.25445-3-bp@alien8.de
---
 arch/x86/include/asm/cpu_device_id.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h
index 10426cd..eb8fced 100644
--- a/arch/x86/include/asm/cpu_device_id.h
+++ b/arch/x86/include/asm/cpu_device_id.h
@@ -160,6 +160,10 @@
 #define X86_MATCH_INTEL_FAM6_MODEL(model, data)				\
 	X86_MATCH_VENDOR_FAM_MODEL(INTEL, 6, INTEL_FAM6_##model, data)
 
+#define X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(model, steppings, data)	\
+	X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(INTEL, 6, INTEL_FAM6_##model, \
+						     steppings, X86_FEATURE_ANY, data)
+
 /*
  * Match specific microcode revisions.
  *

[PATCH 3/3] x86/apic: Convert the TSC deadline timer matching to steppings macro

[Borislav Petkov]

From: Borislav Petkov <bp@suse.de>

... and get rid of the function pointers which would spit out the
microcode revision based on the CPU stepping.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 arch/x86/kernel/apic/apic.c | 57 ++++++++-----------------------------
 1 file changed, 12 insertions(+), 45 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index e53dda210cd7..4b1d31be50b4 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -544,46 +544,20 @@ static struct clock_event_device lapic_clockevent = {
 };
 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
 
-static __init u32 hsx_deadline_rev(void)
-{
-	switch (boot_cpu_data.x86_stepping) {
-	case 0x02: return 0x3a; /* EP */
-	case 0x04: return 0x0f; /* EX */
-	}
-
-	return ~0U;
-}
-
-static __init u32 bdx_deadline_rev(void)
-{
-	switch (boot_cpu_data.x86_stepping) {
-	case 0x02: return 0x00000011;
-	case 0x03: return 0x0700000e;
-	case 0x04: return 0x0f00000c;
-	case 0x05: return 0x0e000003;
-	}
-
-	return ~0U;
-}
-
-static __init u32 skx_deadline_rev(void)
-{
-	switch (boot_cpu_data.x86_stepping) {
-	case 0x03: return 0x01000136;
-	case 0x04: return 0x02000014;
-	}
+static const struct x86_cpu_id deadline_match[] __initconst = {
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x2, 0x2), 0x3a), /* EP */
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x4, 0x4), 0x0f), /* EX */
 
-	if (boot_cpu_data.x86_stepping > 4)
-		return 0;
+	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X,	0x0b000020),
 
-	return ~0U;
-}
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x2, 0x2), 0x00000011),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x3, 0x3), 0x0700000e),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x4, 0x4), 0x0f00000c),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x5, 0x5), 0x0e000003),
 
-static const struct x86_cpu_id deadline_match[] __initconst = {
-	X86_MATCH_INTEL_FAM6_MODEL( HASWELL_X,		&hsx_deadline_rev),
-	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X,	0x0b000020),
-	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_D,	&bdx_deadline_rev),
-	X86_MATCH_INTEL_FAM6_MODEL( SKYLAKE_X,		&skx_deadline_rev),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x3, 0x3), 0x01000136),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x4, 0x4), 0x02000014),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x5, 0xf), 0),
 
 	X86_MATCH_INTEL_FAM6_MODEL( HASWELL,		0x22),
 	X86_MATCH_INTEL_FAM6_MODEL( HASWELL_L,		0x20),
@@ -615,14 +589,7 @@ static __init bool apic_validate_deadline_timer(void)
 	if (!m)
 		return true;
 
-	/*
-	 * Function pointers will have the MSB set due to address layout,
-	 * immediate revisions will not.
-	 */
-	if ((long)m->driver_data < 0)
-		rev = ((u32 (*)(void))(m->driver_data))();
-	else
-		rev = (u32)m->driver_data;
+	rev = (u32)m->driver_data;
 
 	if (boot_cpu_data.microcode >= rev)
 		return true;
-- 
2.21.0

Re: [PATCH 3/3] x86/apic: Convert the TSC deadline timer matching to steppings macro

[mark gross]

Reviewed-by: Mark Gross <mgross.linux.intel.com>

On Wed, May 06, 2020 at 09:15:16AM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
> 
> ... and get rid of the function pointers which would spit out the
> microcode revision based on the CPU stepping.
> 
> Signed-off-by: Borislav Petkov <bp@suse.de>
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
>  arch/x86/kernel/apic/apic.c | 57 ++++++++-----------------------------
>  1 file changed, 12 insertions(+), 45 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index e53dda210cd7..4b1d31be50b4 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -544,46 +544,20 @@ static struct clock_event_device lapic_clockevent = {
>  };
>  static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
>  
> -static __init u32 hsx_deadline_rev(void)
> -{
> -	switch (boot_cpu_data.x86_stepping) {
> -	case 0x02: return 0x3a; /* EP */
> -	case 0x04: return 0x0f; /* EX */
> -	}
> -
> -	return ~0U;
> -}
> -
> -static __init u32 bdx_deadline_rev(void)
> -{
> -	switch (boot_cpu_data.x86_stepping) {
> -	case 0x02: return 0x00000011;
> -	case 0x03: return 0x0700000e;
> -	case 0x04: return 0x0f00000c;
> -	case 0x05: return 0x0e000003;
> -	}
> -
> -	return ~0U;
> -}
> -
> -static __init u32 skx_deadline_rev(void)
> -{
> -	switch (boot_cpu_data.x86_stepping) {
> -	case 0x03: return 0x01000136;
> -	case 0x04: return 0x02000014;
> -	}
> +static const struct x86_cpu_id deadline_match[] __initconst = {
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x2, 0x2), 0x3a), /* EP */
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x4, 0x4), 0x0f), /* EX */
>  
> -	if (boot_cpu_data.x86_stepping > 4)
> -		return 0;
> +	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X,	0x0b000020),
>  
> -	return ~0U;
> -}
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x2, 0x2), 0x00000011),
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x3, 0x3), 0x0700000e),
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x4, 0x4), 0x0f00000c),
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x5, 0x5), 0x0e000003),
>  
> -static const struct x86_cpu_id deadline_match[] __initconst = {
> -	X86_MATCH_INTEL_FAM6_MODEL( HASWELL_X,		&hsx_deadline_rev),
> -	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X,	0x0b000020),
> -	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_D,	&bdx_deadline_rev),
> -	X86_MATCH_INTEL_FAM6_MODEL( SKYLAKE_X,		&skx_deadline_rev),
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x3, 0x3), 0x01000136),
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x4, 0x4), 0x02000014),
> +	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x5, 0xf), 0),
>  
>  	X86_MATCH_INTEL_FAM6_MODEL( HASWELL,		0x22),
>  	X86_MATCH_INTEL_FAM6_MODEL( HASWELL_L,		0x20),
> @@ -615,14 +589,7 @@ static __init bool apic_validate_deadline_timer(void)
>  	if (!m)
>  		return true;
>  
> -	/*
> -	 * Function pointers will have the MSB set due to address layout,
> -	 * immediate revisions will not.
> -	 */
> -	if ((long)m->driver_data < 0)
> -		rev = ((u32 (*)(void))(m->driver_data))();
> -	else
> -		rev = (u32)m->driver_data;
> +	rev = (u32)m->driver_data;
>  
>  	if (boot_cpu_data.microcode >= rev)
>  		return true;
> -- 
> 2.21.0
> 

[tip: x86/cpu] x86/apic: Convert the TSC deadline timer matching to steppings macro

[tip-bot2 for Borislav Petkov]

The following commit has been merged into the x86/cpu branch of tip:

Commit-ID:     66abf2388331b800f290e854cca3ae71de7977fe
Gitweb:        https://git.kernel.org/tip/66abf2388331b800f290e854cca3ae71de7977fe
Author:        Borislav Petkov <bp@suse.de>
AuthorDate:    Tue, 05 May 2020 19:27:16 +02:00
Committer:     Borislav Petkov <bp@suse.de>
CommitterDate: Thu, 07 May 2020 13:50:32 +02:00

x86/apic: Convert the TSC deadline timer matching to steppings macro

... and get rid of the function pointers which would spit out the
microcode revision based on the CPU stepping.

Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mark Gross <mgross.linux.intel.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200506071516.25445-4-bp@alien8.de
---
 arch/x86/kernel/apic/apic.c | 57 +++++++-----------------------------
 1 file changed, 12 insertions(+), 45 deletions(-)

diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index e53dda2..4b1d31b 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -544,46 +544,20 @@ static struct clock_event_device lapic_clockevent = {
 };
 static DEFINE_PER_CPU(struct clock_event_device, lapic_events);
 
-static __init u32 hsx_deadline_rev(void)
-{
-	switch (boot_cpu_data.x86_stepping) {
-	case 0x02: return 0x3a; /* EP */
-	case 0x04: return 0x0f; /* EX */
-	}
-
-	return ~0U;
-}
-
-static __init u32 bdx_deadline_rev(void)
-{
-	switch (boot_cpu_data.x86_stepping) {
-	case 0x02: return 0x00000011;
-	case 0x03: return 0x0700000e;
-	case 0x04: return 0x0f00000c;
-	case 0x05: return 0x0e000003;
-	}
-
-	return ~0U;
-}
-
-static __init u32 skx_deadline_rev(void)
-{
-	switch (boot_cpu_data.x86_stepping) {
-	case 0x03: return 0x01000136;
-	case 0x04: return 0x02000014;
-	}
+static const struct x86_cpu_id deadline_match[] __initconst = {
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x2, 0x2), 0x3a), /* EP */
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(HASWELL_X, X86_STEPPINGS(0x4, 0x4), 0x0f), /* EX */
 
-	if (boot_cpu_data.x86_stepping > 4)
-		return 0;
+	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X,	0x0b000020),
 
-	return ~0U;
-}
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x2, 0x2), 0x00000011),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x3, 0x3), 0x0700000e),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x4, 0x4), 0x0f00000c),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(BROADWELL_D, X86_STEPPINGS(0x5, 0x5), 0x0e000003),
 
-static const struct x86_cpu_id deadline_match[] __initconst = {
-	X86_MATCH_INTEL_FAM6_MODEL( HASWELL_X,		&hsx_deadline_rev),
-	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_X,	0x0b000020),
-	X86_MATCH_INTEL_FAM6_MODEL( BROADWELL_D,	&bdx_deadline_rev),
-	X86_MATCH_INTEL_FAM6_MODEL( SKYLAKE_X,		&skx_deadline_rev),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x3, 0x3), 0x01000136),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x4, 0x4), 0x02000014),
+	X86_MATCH_INTEL_FAM6_MODEL_STEPPINGS(SKYLAKE_X, X86_STEPPINGS(0x5, 0xf), 0),
 
 	X86_MATCH_INTEL_FAM6_MODEL( HASWELL,		0x22),
 	X86_MATCH_INTEL_FAM6_MODEL( HASWELL_L,		0x20),
@@ -615,14 +589,7 @@ static __init bool apic_validate_deadline_timer(void)
 	if (!m)
 		return true;
 
-	/*
-	 * Function pointers will have the MSB set due to address layout,
-	 * immediate revisions will not.
-	 */
-	if ((long)m->driver_data < 0)
-		rev = ((u32 (*)(void))(m->driver_data))();
-	else
-		rev = (u32)m->driver_data;
+	rev = (u32)m->driver_data;
 
 	if (boot_cpu_data.microcode >= rev)
 		return true;