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[PATCH] x86-64/i386: Intel HT, Multi core detection fixes

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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>
This commit is contained in:
Siddha, Suresh B 2005-11-05 17:25:54 +01:00 committed by Linus Torvalds
parent e90f22edf4
commit 94605eff57
11 changed files with 178 additions and 110 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/i386/kernel/cpu/amd.c
View File

@ -206,9 +206,9 @@ static void __init init_amd(struct cpuinfo_x86 *c)
display_cacheinfo(c);
if (cpuid_eax(0x80000000) >= 0x80000008) {
c->x86_num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
if (c->x86_num_cores & (c->x86_num_cores - 1))
c->x86_num_cores = 1;
c->x86_max_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
if (c->x86_max_cores & (c->x86_max_cores - 1))
c->x86_max_cores = 1;
}
#ifdef CONFIG_X86_HT
@ -217,15 +217,15 @@ static void __init init_amd(struct cpuinfo_x86 *c)
* distingush the cores. Assumes number of cores is a power
* of two.
*/
if (c->x86_num_cores > 1) {
if (c->x86_max_cores > 1) {
int cpu = smp_processor_id();
unsigned bits = 0;
while ((1 << bits) < c->x86_num_cores)
while ((1 << bits) < c->x86_max_cores)
bits++;
cpu_core_id[cpu] = phys_proc_id[cpu] & ((1<<bits)-1);
phys_proc_id[cpu] >>= bits;
printk(KERN_INFO "CPU %d(%d) -> Core %d\n",
cpu, c->x86_num_cores, cpu_core_id[cpu]);
cpu, c->x86_max_cores, cpu_core_id[cpu]);
}
#endif
}

36
arch/i386/kernel/cpu/common.c
View File

@ -335,7 +335,7 @@ void __devinit identify_cpu(struct cpuinfo_x86 *c)
c->x86_model = c->x86_mask = 0; /* So far unknown... */
c->x86_vendor_id[0] = '\0'; /* Unset */
c->x86_model_id[0] = '\0'; /* Unset */
c->x86_num_cores = 1;
c->x86_max_cores = 1;
memset(&c->x86_capability, 0, sizeof c->x86_capability);
if (!have_cpuid_p()) {
@ -446,52 +446,44 @@ void __devinit identify_cpu(struct cpuinfo_x86 *c)
void __devinit detect_ht(struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;
int index_msb, tmp;
int index_msb, core_bits;
int cpu = smp_processor_id();
cpuid(1, &eax, &ebx, &ecx, &edx);
c->apicid = phys_pkg_id((ebx >> 24) & 0xFF, 0);
if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
return;
cpuid(1, &eax, &ebx, &ecx, &edx);
smp_num_siblings = (ebx & 0xff0000) >> 16;
if (smp_num_siblings == 1) {
printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
} else if (smp_num_siblings > 1 ) {
index_msb = 31;
if (smp_num_siblings > NR_CPUS) {
printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings);
smp_num_siblings = 1;
return;
}
tmp = smp_num_siblings;
while ((tmp & 0x80000000 ) == 0) {
tmp <<=1 ;
index_msb--;
}
if (smp_num_siblings & (smp_num_siblings - 1))
index_msb++;
index_msb = get_count_order(smp_num_siblings);
phys_proc_id[cpu] = phys_pkg_id((ebx >> 24) & 0xFF, index_msb);
printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
phys_proc_id[cpu]);
smp_num_siblings = smp_num_siblings / c->x86_num_cores;
smp_num_siblings = smp_num_siblings / c->x86_max_cores;
tmp = smp_num_siblings;
index_msb = 31;
while ((tmp & 0x80000000) == 0) {
tmp <<=1 ;
index_msb--;
}
index_msb = get_count_order(smp_num_siblings) ;
if (smp_num_siblings & (smp_num_siblings - 1))
index_msb++;
core_bits = get_count_order(c->x86_max_cores);
cpu_core_id[cpu] = phys_pkg_id((ebx >> 24) & 0xFF, index_msb);
cpu_core_id[cpu] = phys_pkg_id((ebx >> 24) & 0xFF, index_msb) &
((1 << core_bits) - 1);
if (c->x86_num_cores > 1)
if (c->x86_max_cores > 1)
printk(KERN_INFO "CPU: Processor Core ID: %d\n",
cpu_core_id[cpu]);
}

2
arch/i386/kernel/cpu/intel.c
View File

@ -157,7 +157,7 @@ static void __devinit init_intel(struct cpuinfo_x86 *c)
if ( p )
strcpy(c->x86_model_id, p);
c->x86_num_cores = num_cpu_cores(c);
c->x86_max_cores = num_cpu_cores(c);
detect_ht(c);

2
arch/i386/kernel/cpu/intel_cacheinfo.c
View File

@ -307,7 +307,7 @@ static void __cpuinit cache_shared_cpu_map_setup(unsigned int cpu, int index)
#ifdef CONFIG_X86_HT
else if (num_threads_sharing == smp_num_siblings)
this_leaf->shared_cpu_map = cpu_sibling_map[cpu];
else if (num_threads_sharing == (c->x86_num_cores * smp_num_siblings))
else if (num_threads_sharing == (c->x86_max_cores * smp_num_siblings))
this_leaf->shared_cpu_map = cpu_core_map[cpu];
else
printk(KERN_DEBUG "Number of CPUs sharing cache didn't match "

7
arch/i386/kernel/cpu/proc.c
View File

@ -94,12 +94,11 @@ static int show_cpuinfo(struct seq_file *m, void *v)
if (c->x86_cache_size >= 0)
seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
#ifdef CONFIG_X86_HT
if (c->x86_num_cores * smp_num_siblings > 1) {
if (c->x86_max_cores * smp_num_siblings > 1) {
seq_printf(m, "physical id\t: %d\n", phys_proc_id[n]);
seq_printf(m, "siblings\t: %d\n",
c->x86_num_cores * smp_num_siblings);
seq_printf(m, "siblings\t: %d\n", cpus_weight(cpu_core_map[n]));
seq_printf(m, "core id\t\t: %d\n", cpu_core_id[n]);
seq_printf(m, "cpu cores\t: %d\n", c->x86_num_cores);
seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
}
#endif

73
arch/i386/kernel/smpboot.c
View File

@ -74,9 +74,11 @@ EXPORT_SYMBOL(phys_proc_id);
int cpu_core_id[NR_CPUS] __read_mostly = {[0 ... NR_CPUS-1] = BAD_APICID};
EXPORT_SYMBOL(cpu_core_id);
/* representing HT siblings of each logical CPU */
cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_sibling_map);
/* representing HT and core siblings of each logical CPU */
cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_core_map);
@ -444,35 +446,60 @@ static void __devinit smp_callin(void)
static int cpucount;
/* representing cpus for which sibling maps can be computed */
static cpumask_t cpu_sibling_setup_map;
static inline void
set_cpu_sibling_map(int cpu)
{
int i;
struct cpuinfo_x86 *c = cpu_data;
cpu_set(cpu, cpu_sibling_setup_map);
if (smp_num_siblings > 1) {
for (i = 0; i < NR_CPUS; i++) {
if (!cpu_isset(i, cpu_callout_map))
continue;
if (cpu_core_id[cpu] == cpu_core_id[i]) {
for_each_cpu_mask(i, cpu_sibling_setup_map) {
if (phys_proc_id[cpu] == phys_proc_id[i] &&
cpu_core_id[cpu] == cpu_core_id[i]) {
cpu_set(i, cpu_sibling_map[cpu]);
cpu_set(cpu, cpu_sibling_map[i]);
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
}
}
} else {
cpu_set(cpu, cpu_sibling_map[cpu]);
}
if (current_cpu_data.x86_num_cores > 1) {
for (i = 0; i < NR_CPUS; i++) {
if (!cpu_isset(i, cpu_callout_map))
continue;
if (phys_proc_id[cpu] == phys_proc_id[i]) {
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
}
}
} else {
if (current_cpu_data.x86_max_cores == 1) {
cpu_core_map[cpu] = cpu_sibling_map[cpu];
c[cpu].booted_cores = 1;
return;
}
for_each_cpu_mask(i, cpu_sibling_setup_map) {
if (phys_proc_id[cpu] == phys_proc_id[i]) {
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
/*
* Does this new cpu bringup a new core?
*/
if (cpus_weight(cpu_sibling_map[cpu]) == 1) {
/*
* for each core in package, increment
* the booted_cores for this new cpu
*/
if (first_cpu(cpu_sibling_map[i]) == i)
c[cpu].booted_cores++;
/*
* increment the core count for all
* the other cpus in this package
*/
if (i != cpu)
c[i].booted_cores++;
} else if (i != cpu && !c[cpu].booted_cores)
c[cpu].booted_cores = c[i].booted_cores;
}
}
}
@ -1096,11 +1123,8 @@ static void __init smp_boot_cpus(unsigned int max_cpus)
current_thread_info()->cpu = 0;
smp_tune_scheduling();
cpus_clear(cpu_sibling_map[0]);
cpu_set(0, cpu_sibling_map[0]);
cpus_clear(cpu_core_map[0]);
cpu_set(0, cpu_core_map[0]);
set_cpu_sibling_map(0);
/*
* If we couldn't find an SMP configuration at boot time,
@ -1279,15 +1303,24 @@ static void
remove_siblinginfo(int cpu)
{
int sibling;
struct cpuinfo_x86 *c = cpu_data;
for_each_cpu_mask(sibling, cpu_core_map[cpu]) {
cpu_clear(cpu, cpu_core_map[sibling]);
/*
* last thread sibling in this cpu core going down
*/
if (cpus_weight(cpu_sibling_map[cpu]) == 1)
c[sibling].booted_cores--;
}
for_each_cpu_mask(sibling, cpu_sibling_map[cpu])
cpu_clear(cpu, cpu_sibling_map[sibling]);
for_each_cpu_mask(sibling, cpu_core_map[cpu])
cpu_clear(cpu, cpu_core_map[sibling]);
cpus_clear(cpu_sibling_map[cpu]);
cpus_clear(cpu_core_map[cpu]);
phys_proc_id[cpu] = BAD_APICID;
cpu_core_id[cpu] = BAD_APICID;
cpu_clear(cpu, cpu_sibling_setup_map);
}
int __cpu_disable(void)

69
arch/x86_64/kernel/setup.c
View File

@ -795,7 +795,7 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
#endif
bits = 0;
while ((1 << bits) < c->x86_num_cores)
while ((1 << bits) < c->x86_max_cores)
bits++;
/* Low order bits define the core id (index of core in socket) */
@ -828,7 +828,7 @@ static void __init amd_detect_cmp(struct cpuinfo_x86 *c)
numa_set_node(cpu, node);
printk(KERN_INFO "CPU %d(%d) -> Node %d -> Core %d\n",
cpu, c->x86_num_cores, node, cpu_core_id[cpu]);
cpu, c->x86_max_cores, node, cpu_core_id[cpu]);
#endif
#endif
}
@ -877,9 +877,9 @@ static int __init init_amd(struct cpuinfo_x86 *c)
display_cacheinfo(c);
if (c->extended_cpuid_level >= 0x80000008) {
c->x86_num_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
if (c->x86_num_cores & (c->x86_num_cores - 1))
c->x86_num_cores = 1;
c->x86_max_cores = (cpuid_ecx(0x80000008) & 0xff) + 1;
if (c->x86_max_cores & (c->x86_max_cores - 1))
c->x86_max_cores = 1;
amd_detect_cmp(c);
}
@ -891,54 +891,44 @@ static void __cpuinit detect_ht(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_SMP
u32 eax, ebx, ecx, edx;
int index_msb, tmp;
int index_msb, core_bits;
int cpu = smp_processor_id();
cpuid(1, &eax, &ebx, &ecx, &edx);
c->apicid = phys_pkg_id(0);
if (!cpu_has(c, X86_FEATURE_HT) || cpu_has(c, X86_FEATURE_CMP_LEGACY))
return;
cpuid(1, &eax, &ebx, &ecx, &edx);
smp_num_siblings = (ebx & 0xff0000) >> 16;
if (smp_num_siblings == 1) {
printk(KERN_INFO "CPU: Hyper-Threading is disabled\n");
} else if (smp_num_siblings > 1) {
index_msb = 31;
/*
* At this point we only support two siblings per
* processor package.
*/
} else if (smp_num_siblings > 1 ) {
if (smp_num_siblings > NR_CPUS) {
printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings);
smp_num_siblings = 1;
return;
}
tmp = smp_num_siblings;
while ((tmp & 0x80000000 ) == 0) {
tmp <<=1 ;
index_msb--;
}
if (smp_num_siblings & (smp_num_siblings - 1))
index_msb++;
index_msb = get_count_order(smp_num_siblings);
phys_proc_id[cpu] = phys_pkg_id(index_msb);
printk(KERN_INFO "CPU: Physical Processor ID: %d\n",
phys_proc_id[cpu]);
smp_num_siblings = smp_num_siblings / c->x86_num_cores;
smp_num_siblings = smp_num_siblings / c->x86_max_cores;
tmp = smp_num_siblings;
index_msb = 31;
while ((tmp & 0x80000000) == 0) {
tmp <<=1 ;
index_msb--;
}
if (smp_num_siblings & (smp_num_siblings - 1))
index_msb++;
index_msb = get_count_order(smp_num_siblings) ;
cpu_core_id[cpu] = phys_pkg_id(index_msb);
core_bits = get_count_order(c->x86_max_cores);
if (c->x86_num_cores > 1)
cpu_core_id[cpu] = phys_pkg_id(index_msb) &
((1 << core_bits) - 1);
if (c->x86_max_cores > 1)
printk(KERN_INFO "CPU: Processor Core ID: %d\n",
cpu_core_id[cpu]);
}
@ -1006,7 +996,7 @@ static void __cpuinit init_intel(struct cpuinfo_x86 *c)
c->x86_cache_alignment = c->x86_clflush_size * 2;
if (c->x86 >= 15)
set_bit(X86_FEATURE_CONSTANT_TSC, &c->x86_capability);
c->x86_num_cores = intel_num_cpu_cores(c);
c->x86_max_cores = intel_num_cpu_cores(c);
srat_detect_node();
}
@ -1044,7 +1034,7 @@ void __cpuinit early_identify_cpu(struct cpuinfo_x86 *c)
c->x86_model_id[0] = '\0'; /* Unset */
c->x86_clflush_size = 64;
c->x86_cache_alignment = c->x86_clflush_size;
c->x86_num_cores = 1;
c->x86_max_cores = 1;
c->extended_cpuid_level = 0;
memset(&c->x86_capability, 0, sizeof c->x86_capability);
@ -1278,13 +1268,12 @@ static int show_cpuinfo(struct seq_file *m, void *v)
seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
#ifdef CONFIG_SMP
if (smp_num_siblings * c->x86_num_cores > 1) {
if (smp_num_siblings * c->x86_max_cores > 1) {
int cpu = c - cpu_data;
seq_printf(m, "physical id\t: %d\n", phys_proc_id[cpu]);
seq_printf(m, "siblings\t: %d\n",
c->x86_num_cores * smp_num_siblings);
seq_printf(m, "siblings\t: %d\n", cpus_weight(cpu_core_map[cpu]));
seq_printf(m, "core id\t\t: %d\n", cpu_core_id[cpu]);
seq_printf(m, "cpu cores\t: %d\n", c->x86_num_cores);
seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
}
#endif

69
arch/x86_64/kernel/smpboot.c
View File

@ -64,6 +64,7 @@
int smp_num_siblings = 1;
/* Package ID of each logical CPU */
u8 phys_proc_id[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
/* core ID of each logical CPU */
u8 cpu_core_id[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
EXPORT_SYMBOL(phys_proc_id);
EXPORT_SYMBOL(cpu_core_id);
@ -89,7 +90,10 @@ struct cpuinfo_x86 cpu_data[NR_CPUS] __cacheline_aligned;
/* Set when the idlers are all forked */
int smp_threads_ready;
/* representing HT siblings of each logical CPU */
cpumask_t cpu_sibling_map[NR_CPUS] __read_mostly;
/* representing HT and core siblings of each logical CPU */
cpumask_t cpu_core_map[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_core_map);
@ -436,30 +440,59 @@ void __cpuinit smp_callin(void)
cpu_set(cpuid, cpu_callin_map);
}
/* representing cpus for which sibling maps can be computed */
static cpumask_t cpu_sibling_setup_map;
static inline void set_cpu_sibling_map(int cpu)
{
int i;
struct cpuinfo_x86 *c = cpu_data;
cpu_set(cpu, cpu_sibling_setup_map);
if (smp_num_siblings > 1) {
for_each_cpu(i) {
if (cpu_core_id[cpu] == cpu_core_id[i]) {
for_each_cpu_mask(i, cpu_sibling_setup_map) {
if (phys_proc_id[cpu] == phys_proc_id[i] &&
cpu_core_id[cpu] == cpu_core_id[i]) {
cpu_set(i, cpu_sibling_map[cpu]);
cpu_set(cpu, cpu_sibling_map[i]);
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
}
}
} else {
cpu_set(cpu, cpu_sibling_map[cpu]);
}
if (current_cpu_data.x86_num_cores > 1) {
for_each_cpu(i) {
if (phys_proc_id[cpu] == phys_proc_id[i]) {
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
}
}
} else {
if (current_cpu_data.x86_max_cores == 1) {
cpu_core_map[cpu] = cpu_sibling_map[cpu];
c[cpu].booted_cores = 1;
return;
}
for_each_cpu_mask(i, cpu_sibling_setup_map) {
if (phys_proc_id[cpu] == phys_proc_id[i]) {
cpu_set(i, cpu_core_map[cpu]);
cpu_set(cpu, cpu_core_map[i]);
/*
* Does this new cpu bringup a new core?
*/
if (cpus_weight(cpu_sibling_map[cpu]) == 1) {
/*
* for each core in package, increment
* the booted_cores for this new cpu
*/
if (first_cpu(cpu_sibling_map[i]) == i)
c[cpu].booted_cores++;
/*
* increment the core count for all
* the other cpus in this package
*/
if (i != cpu)
c[i].booted_cores++;
} else if (i != cpu && !c[cpu].booted_cores)
c[cpu].booted_cores = c[i].booted_cores;
}
}
}
@ -993,6 +1026,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
nmi_watchdog_default();
current_cpu_data = boot_cpu_data;
current_thread_info()->cpu = 0; /* needed? */
set_cpu_sibling_map(0);
if (smp_sanity_check(max_cpus) < 0) {
printk(KERN_INFO "SMP disabled\n");
@ -1036,8 +1070,6 @@ void __init smp_prepare_boot_cpu(void)
int me = smp_processor_id();
cpu_set(me, cpu_online_map);
cpu_set(me, cpu_callout_map);
cpu_set(0, cpu_sibling_map[0]);
cpu_set(0, cpu_core_map[0]);
per_cpu(cpu_state, me) = CPU_ONLINE;
}
@ -1106,15 +1138,24 @@ void __init smp_cpus_done(unsigned int max_cpus)
static void remove_siblinginfo(int cpu)
{
int sibling;
struct cpuinfo_x86 *c = cpu_data;
for_each_cpu_mask(sibling, cpu_core_map[cpu]) {
cpu_clear(cpu, cpu_core_map[sibling]);
/*
* last thread sibling in this cpu core going down
*/
if (cpus_weight(cpu_sibling_map[cpu]) == 1)
c[sibling].booted_cores--;
}
for_each_cpu_mask(sibling, cpu_sibling_map[cpu])
cpu_clear(cpu, cpu_sibling_map[sibling]);
for_each_cpu_mask(sibling, cpu_core_map[cpu])
cpu_clear(cpu, cpu_core_map[sibling]);
cpus_clear(cpu_sibling_map[cpu]);
cpus_clear(cpu_core_map[cpu]);
phys_proc_id[cpu] = BAD_APICID;
cpu_core_id[cpu] = BAD_APICID;
cpu_clear(cpu, cpu_sibling_setup_map);
}
void remove_cpu_from_maps(void)

4
include/asm-i386/processor.h
View File

@ -65,7 +65,9 @@ struct cpuinfo_x86 {
int f00f_bug;
int coma_bug;
unsigned long loops_per_jiffy;
unsigned char x86_num_cores;
unsigned char x86_max_cores; /* cpuid returned max cores value */
unsigned char booted_cores; /* number of cores as seen by OS */
unsigned char apicid;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));
#define X86_VENDOR_INTEL 0

4
include/asm-x86_64/processor.h
View File

@ -61,10 +61,12 @@ struct cpuinfo_x86 {
int x86_cache_alignment;
int x86_tlbsize; /* number of 4K pages in DTLB/ITLB combined(in pages)*/
__u8 x86_virt_bits, x86_phys_bits;
__u8 x86_num_cores;
__u8 x86_max_cores; /* cpuid returned max cores value */
__u32 x86_power;
__u32 extended_cpuid_level; /* Max extended CPUID function supported */
unsigned long loops_per_jiffy;
__u8 apicid;
__u8 booted_cores; /* number of cores as seen by OS */
} ____cacheline_aligned;
#define X86_VENDOR_INTEL 0

10
include/linux/bitops.h
View File

@ -84,6 +84,16 @@ static __inline__ int get_bitmask_order(unsigned int count)
return order; /* We could be slightly more clever with -1 here... */
}
static __inline__ int get_count_order(unsigned int count)
{
int order;
order = fls(count) - 1;
if (count & (count - 1))
order++;
return order;
}
/*
* hweightN: returns the hamming weight (i.e. the number
* of bits set) of a N-bit word