[PATCH] x86-64 add Intel BTS cpufeature bit and detection (take 2)

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Andi,

Here is a small patch for x86-64 which adds a cpufeature flag and
detection code for Intel's Branch Trace Store (BTS) feature. This
feature can be found on Intel P4 and Core 2 processors among others.
It can also be used by perfmon.

The patch is relative to 2.6.19-rc5-git7 + x86_64-2.6.19-rc5-git7-061116-2

changelog:
	- add CPU_FEATURE_BTS
	- add Branch Trace Store detection

signed-off-by: stephane eranian <[email protected]>

diff --exclude=.git -urNp linux-2.6.19-rc5-git7-ak.orig/arch/x86_64/kernel/setup.c linux-2.6.19-rc5-git7-ak/arch/x86_64/kernel/setup.c
--- linux-2.6.19-rc5-git7-ak.orig/arch/x86_64/kernel/setup.c	2006-11-16 05:15:39.000000000 -0800
+++ linux-2.6.19-rc5-git7-ak/arch/x86_64/kernel/setup.c	2006-11-16 05:46:51.000000000 -0800
@@ -838,6 +838,8 @@ static void __cpuinit init_intel(struct 
 	if (cpu_has_ds) {
 		unsigned int l1, l2;
 		rdmsr(MSR_IA32_MISC_ENABLE, l1, l2);
+		if (!(l1 & (1<<11)))
+			set_bit(X86_FEATURE_BTS, c->x86_capability);
 		if (!(l1 & (1<<12)))
 			set_bit(X86_FEATURE_PEBS, c->x86_capability);
 	}
diff --exclude=.git -urNp linux-2.6.19-rc5-git7-ak.orig/include/asm-x86_64/cpufeature.h linux-2.6.19-rc5-git7-ak/include/asm-x86_64/cpufeature.h
--- linux-2.6.19-rc5-git7-ak.orig/include/asm-x86_64/cpufeature.h	2006-11-16 05:15:39.000000000 -0800
+++ linux-2.6.19-rc5-git7-ak/include/asm-x86_64/cpufeature.h	2006-11-16 05:47:52.000000000 -0800
@@ -69,6 +69,7 @@
 #define X86_FEATURE_UP		(3*32+8) /* SMP kernel running on UP */
 #define X86_FEATURE_ARCH_PERFMON (3*32+9) /* Intel Architectural PerfMon */
 #define X86_FEATURE_PEBS	(3*32+10) /* Precise-Event Based Sampling */
+#define X86_FEATURE_BTS		(3*32+11) /* Branch Trace Store */
 
 /* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
 #define X86_FEATURE_XMM3	(4*32+ 0) /* Streaming SIMD Extensions-3 */
@@ -115,5 +116,6 @@
 #define cpu_has_clflush	       boot_cpu_has(X86_FEATURE_CLFLSH)
 #define cpu_has_ds 	       boot_cpu_has(X86_FEATURE_DS)
 #define cpu_has_pebs 	       boot_cpu_has(X86_FEATURE_PEBS)
+#define cpu_has_bts 	       boot_cpu_has(X86_FEATURE_BTS)
 
 #endif /* __ASM_X8664_CPUFEATURE_H */
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux