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Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 cpu changes from Ingo Molnar:
 "The biggest change that stands out is the increase of the
  CONFIG_NR_CPUS range from 4096 to 8192 - as real hardware out there
  already went beyond 4k CPUs ...

  We only allow more than 512 CPUs if offstack cpumasks are enabled.

  CONFIG_MAXSMP=y remains to be the 'you are nuts!' extreme testcase,
  which now means a max of 8192 CPUs"

* 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu: Increase max CPU count to 8192
  x86/cpu: Allow higher NR_CPUS values
  x86/cpu: Always print SMP information in /proc/cpuinfo
  x86/cpu: Track legacy CPU model data only on 32-bit kernels
This commit is contained in:
Linus Torvalds 2013-11-12 10:46:43 +09:00
commit 6df1e7f2e9
8 changed files with 45 additions and 40 deletions
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8
arch/x86/Kconfig
View File

@ -826,14 +826,16 @@ config MAXSMP
config NR_CPUS
int "Maximum number of CPUs" if SMP && !MAXSMP
range 2 8 if SMP && X86_32 && !X86_BIGSMP
range 2 512 if SMP && !MAXSMP
range 2 512 if SMP && !MAXSMP && !CPUMASK_OFFSTACK
range 2 8192 if SMP && !MAXSMP && CPUMASK_OFFSTACK && X86_64
default "1" if !SMP
default "4096" if MAXSMP
default "8192" if MAXSMP
default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
default "8" if SMP
---help---
This allows you to specify the maximum number of CPUs which this
kernel will support. The maximum supported value is 512 and the
kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum
supported value is 4096, otherwise the maximum value is 512. The
minimum value which makes sense is 2.
This is purely to save memory - each supported CPU adds

6
arch/x86/kernel/cpu/amd.c
View File

@ -823,8 +823,8 @@ static const struct cpu_dev amd_cpu_dev = {
.c_vendor = "AMD",
.c_ident = { "AuthenticAMD" },
#ifdef CONFIG_X86_32
.c_models = {
{ .vendor = X86_VENDOR_AMD, .family = 4, .model_names =
.legacy_models = {
{ .family = 4, .model_names =
{
[3] = "486 DX/2",
[7] = "486 DX/2-WB",
@ -835,7 +835,7 @@ static const struct cpu_dev amd_cpu_dev = {
}
},
},
.c_size_cache = amd_size_cache,
.legacy_cache_size = amd_size_cache,
#endif
.c_early_init = early_init_amd,
.c_detect_tlb = cpu_detect_tlb_amd,

8
arch/x86/kernel/cpu/centaur.c
View File

@ -468,10 +468,10 @@ static void init_centaur(struct cpuinfo_x86 *c)
#endif
}
#ifdef CONFIG_X86_32
static unsigned int
centaur_size_cache(struct cpuinfo_x86 *c, unsigned int size)
{
#ifdef CONFIG_X86_32
/* VIA C3 CPUs (670-68F) need further shifting. */
if ((c->x86 == 6) && ((c->x86_model == 7) || (c->x86_model == 8)))
size >>= 8;
@ -484,16 +484,18 @@ centaur_size_cache(struct cpuinfo_x86 *c, unsigned int size)
if ((c->x86 == 6) && (c->x86_model == 9) &&
(c->x86_mask == 1) && (size == 65))
size -= 1;
#endif
return size;
}
#endif
static const struct cpu_dev centaur_cpu_dev = {
.c_vendor = "Centaur",
.c_ident = { "CentaurHauls" },
.c_early_init = early_init_centaur,
.c_init = init_centaur,
.c_size_cache = centaur_size_cache,
#ifdef CONFIG_X86_32
.legacy_cache_size = centaur_size_cache,
#endif
.c_x86_vendor = X86_VENDOR_CENTAUR,
};

12
arch/x86/kernel/cpu/common.c
View File

@ -346,7 +346,8 @@ static void filter_cpuid_features(struct cpuinfo_x86 *c, bool warn)
/* Look up CPU names by table lookup. */
static const char *table_lookup_model(struct cpuinfo_x86 *c)
{
const struct cpu_model_info *info;
#ifdef CONFIG_X86_32
const struct legacy_cpu_model_info *info;
if (c->x86_model >= 16)
return NULL; /* Range check */
@ -354,13 +355,14 @@ static const char *table_lookup_model(struct cpuinfo_x86 *c)
if (!this_cpu)
return NULL;
info = this_cpu->c_models;
info = this_cpu->legacy_models;
while (info && info->family) {
while (info->family) {
if (info->family == c->x86)
return info->model_names[c->x86_model];
info++;
}
#endif
return NULL; /* Not found */
}
@ -450,8 +452,8 @@ void cpu_detect_cache_sizes(struct cpuinfo_x86 *c)
c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff);
#else
/* do processor-specific cache resizing */
if (this_cpu->c_size_cache)
l2size = this_cpu->c_size_cache(c, l2size);
if (this_cpu->legacy_cache_size)
l2size = this_cpu->legacy_cache_size(c, l2size);
/* Allow user to override all this if necessary. */
if (cachesize_override != -1)

20
arch/x86/kernel/cpu/cpu.h
View File

@ -1,12 +1,6 @@
#ifndef ARCH_X86_CPU_H
#define ARCH_X86_CPU_H
struct cpu_model_info {
int vendor;
int family;
const char *model_names[16];
};
/* attempt to consolidate cpu attributes */
struct cpu_dev {
const char *c_vendor;
@ -14,15 +8,23 @@ struct cpu_dev {
/* some have two possibilities for cpuid string */
const char *c_ident[2];
struct cpu_model_info c_models[4];
void (*c_early_init)(struct cpuinfo_x86 *);
void (*c_bsp_init)(struct cpuinfo_x86 *);
void (*c_init)(struct cpuinfo_x86 *);
void (*c_identify)(struct cpuinfo_x86 *);
void (*c_detect_tlb)(struct cpuinfo_x86 *);
unsigned int (*c_size_cache)(struct cpuinfo_x86 *, unsigned int);
int c_x86_vendor;
#ifdef CONFIG_X86_32
/* Optional vendor specific routine to obtain the cache size. */
unsigned int (*legacy_cache_size)(struct cpuinfo_x86 *,
unsigned int);
/* Family/stepping-based lookup table for model names. */
struct legacy_cpu_model_info {
int family;
const char *model_names[16];
} legacy_models[5];
#endif
};
struct _tlb_table {

12
arch/x86/kernel/cpu/intel.c
View File

@ -665,8 +665,8 @@ static const struct cpu_dev intel_cpu_dev = {
.c_vendor = "Intel",
.c_ident = { "GenuineIntel" },
#ifdef CONFIG_X86_32
.c_models = {
{ .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
.legacy_models = {
{ .family = 4, .model_names =
{
[0] = "486 DX-25/33",
[1] = "486 DX-50",
@ -679,7 +679,7 @@ static const struct cpu_dev intel_cpu_dev = {
[9] = "486 DX/4-WB"
}
},
{ .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
{ .family = 5, .model_names =
{
[0] = "Pentium 60/66 A-step",
[1] = "Pentium 60/66",
@ -690,7 +690,7 @@ static const struct cpu_dev intel_cpu_dev = {
[8] = "Mobile Pentium MMX"
}
},
{ .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
{ .family = 6, .model_names =
{
[0] = "Pentium Pro A-step",
[1] = "Pentium Pro",
@ -704,7 +704,7 @@ static const struct cpu_dev intel_cpu_dev = {
[11] = "Pentium III (Tualatin)",
}
},
{ .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
{ .family = 15, .model_names =
{
[0] = "Pentium 4 (Unknown)",
[1] = "Pentium 4 (Willamette)",
@ -714,7 +714,7 @@ static const struct cpu_dev intel_cpu_dev = {
}
},
},
.c_size_cache = intel_size_cache,
.legacy_cache_size = intel_size_cache,
#endif
.c_detect_tlb = intel_detect_tlb,
.c_early_init = early_init_intel,

5
arch/x86/kernel/cpu/proc.c
View File

@ -11,15 +11,12 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
unsigned int cpu)
{
#ifdef CONFIG_SMP
if (c->x86_max_cores * smp_num_siblings > 1) {
seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
seq_printf(m, "siblings\t: %d\n",
cpumask_weight(cpu_core_mask(cpu)));
seq_printf(m, "siblings\t: %d\n", cpumask_weight(cpu_core_mask(cpu)));
seq_printf(m, "core id\t\t: %d\n", c->cpu_core_id);
seq_printf(m, "cpu cores\t: %d\n", c->booted_cores);
seq_printf(m, "apicid\t\t: %d\n", c->apicid);
seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
}
#endif
}

4
arch/x86/kernel/cpu/umc.c
View File

@ -11,8 +11,8 @@
static const struct cpu_dev umc_cpu_dev = {
.c_vendor = "UMC",
.c_ident = { "UMC UMC UMC" },
.c_models = {
{ .vendor = X86_VENDOR_UMC, .family = 4, .model_names =
.legacy_models = {
{ .family = 4, .model_names =
{
[1] = "U5D",
[2] = "U5S",