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[PATCH v4 4/4] x86/phi: Add R3MWAIT to CPU features

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  [PATCH v4 4/4] x86/phi: Add R3MWAIT to CPU features Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com> - 2016-10-18 12:10 +0200
    Re: [PATCH v4 4/4] x86/phi: Add R3MWAIT to CPU features Thomas Gleixner <tglx@linutronix.de> - 2016-10-20 21:20 +0200

#1502861 — [PATCH v4 4/4] x86/phi: Add R3MWAIT to CPU features

Add cpu feature for ring 3 monitor/mwait.
Set HWCAP2 1st bit during init.

Signed-off-by: Grzegorz Andrejczuk <grzegorz.andrejczuk@intel.com>
---
 arch/x86/include/asm/cpufeatures.h | 2 ++
 arch/x86/kernel/cpu/intel.c        | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 92a8308..d430200 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -71,6 +71,8 @@
 #define X86_FEATURE_RECOVERY	( 2*32+ 0) /* CPU in recovery mode */
 #define X86_FEATURE_LONGRUN	( 2*32+ 1) /* Longrun power control */
 #define X86_FEATURE_LRTI	( 2*32+ 3) /* LongRun table interface */
+/* Xeon Phi x200 ring 3 MONITOR/MWAIT enabled */
+#define X86_FEATURE_PHIR3MWAIT	( 2*32+ 4)
 
 /* Other features, Linux-defined mapping, word 3 */
 /* This range is used for feature bits which conflict or are synthesized */
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 1134dca..a2ea905 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -14,6 +14,8 @@
 #include <asm/bugs.h>
 #include <asm/cpu.h>
 #include <asm/intel-family.h>
+#include <asm/hwcap2.h>
+#include <asm/elf.h>
 
 #ifdef CONFIG_X86_64
 #include <linux/topology.h>
@@ -87,6 +89,8 @@ static void probe_xeon_phi_r3mwait(struct cpuinfo_x86 *c)
 		rdmsrl(MSR_PHI_MISC_THD_FEATURE, msr);
 		msr |= MSR_PHI_MISC_THD_FEATURE_R3MWAIT;
 		wrmsrl(MSR_PHI_MISC_THD_FEATURE, msr);
+		set_cpu_cap(c, X86_FEATURE_PHIR3MWAIT);
+		ELF_HWCAP2 |= HWCAP2_PHIR3MWAIT;
 	}
 }
 
-- 
2.5.1

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#1505196

On Tue, 18 Oct 2016, Grzegorz Andrejczuk wrote:

x86/phi: is not a proper subsystem. x86/cpufeature: is what you want here.

Thanks,

	tglx

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