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authorSiddha, Suresh B <suresh.b.siddha@intel.com>2005-11-05 11:25:54 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-14 22:55:16 -0500
commit94605eff572b727aaad9b4b29bc358b919096503 (patch)
tree657a848d8ef34d2f94bbad3aa4e5458d2d3f2d2b /include
parente90f22edf432512219cc2952f5811961abbd164f (diff)
[PATCH] x86-64/i386: Intel HT, Multi core detection fixes
Fields obtained through cpuid vector 0x1(ebx[16:23]) and vector 0x4(eax[14:25], eax[26:31]) indicate the maximum values and might not always be the same as what is available and what OS sees. So make sure "siblings" and "cpu cores" values in /proc/cpuinfo reflect the values as seen by OS instead of what cpuid instruction says. This will also fix the buggy BIOS cases (for example where cpuid on a single core cpu says there are "2" siblings, even when HT is disabled in the BIOS. http://bugzilla.kernel.org/show_bug.cgi?id=4359) Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/asm-i386/processor.h4
-rw-r--r--include/asm-x86_64/processor.h4
-rw-r--r--include/linux/bitops.h10
3 files changed, 16 insertions, 2 deletions
diff --git a/include/asm-i386/processor.h b/include/asm-i386/processor.h
index 0a4ec764377c..9cd4a05234a1 100644
--- a/include/asm-i386/processor.h
+++ b/include/asm-i386/processor.h
@@ -65,7 +65,9 @@ struct cpuinfo_x86 {
65 int f00f_bug; 65 int f00f_bug;
66 int coma_bug; 66 int coma_bug;
67 unsigned long loops_per_jiffy; 67 unsigned long loops_per_jiffy;
68 unsigned char x86_num_cores; 68 unsigned char x86_max_cores; /* cpuid returned max cores value */
69 unsigned char booted_cores; /* number of cores as seen by OS */
70 unsigned char apicid;
69} __attribute__((__aligned__(SMP_CACHE_BYTES))); 71} __attribute__((__aligned__(SMP_CACHE_BYTES)));
70 72
71#define X86_VENDOR_INTEL 0 73#define X86_VENDOR_INTEL 0
diff --git a/include/asm-x86_64/processor.h b/include/asm-x86_64/processor.h
index 03837d34fba0..4861246548f7 100644
--- a/include/asm-x86_64/processor.h
+++ b/include/asm-x86_64/processor.h
@@ -61,10 +61,12 @@ struct cpuinfo_x86 {
61 int x86_cache_alignment; 61 int x86_cache_alignment;
62 int x86_tlbsize; /* number of 4K pages in DTLB/ITLB combined(in pages)*/ 62 int x86_tlbsize; /* number of 4K pages in DTLB/ITLB combined(in pages)*/
63 __u8 x86_virt_bits, x86_phys_bits; 63 __u8 x86_virt_bits, x86_phys_bits;
64 __u8 x86_num_cores; 64 __u8 x86_max_cores; /* cpuid returned max cores value */
65 __u32 x86_power; 65 __u32 x86_power;
66 __u32 extended_cpuid_level; /* Max extended CPUID function supported */ 66 __u32 extended_cpuid_level; /* Max extended CPUID function supported */
67 unsigned long loops_per_jiffy; 67 unsigned long loops_per_jiffy;
68 __u8 apicid;
69 __u8 booted_cores; /* number of cores as seen by OS */
68} ____cacheline_aligned; 70} ____cacheline_aligned;
69 71
70#define X86_VENDOR_INTEL 0 72#define X86_VENDOR_INTEL 0
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index cb3c3ef50f50..38c2fb7ebe09 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -84,6 +84,16 @@ static __inline__ int get_bitmask_order(unsigned int count)
84 return order; /* We could be slightly more clever with -1 here... */ 84 return order; /* We could be slightly more clever with -1 here... */
85} 85}
86 86
87static __inline__ int get_count_order(unsigned int count)
88{
89 int order;
90
91 order = fls(count) - 1;
92 if (count & (count - 1))
93 order++;
94 return order;
95}
96
87/* 97/*
88 * hweightN: returns the hamming weight (i.e. the number 98 * hweightN: returns the hamming weight (i.e. the number
89 * of bits set) of a N-bit word 99 * of bits set) of a N-bit word