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[PATCH] x86: sutomatically enable bigsmp when we have more than 8 CPUs

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i386 generic subarchitecture requires explicit dmi strings or command line
to enable bigsmp mode.  The patch below removes that restriction, and uses
bigsmp as soon as it finds more than 8 logical CPUs, Intel processors and
xAPIC support.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Venkatesh Pallipadi 2005-09-03 15:56:31 -07:00 committed by Linus Torvalds
parent 484b90c4b9
commit 911a62d423
8 changed files with 47 additions and 2 deletions
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3
arch/i386/kernel/acpi/boot.c
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@ -833,6 +833,9 @@ acpi_process_madt(void)
if (!error) {
acpi_lapic = 1;
#ifdef CONFIG_X86_GENERICARCH
generic_bigsmp_probe();
#endif
/*
* Parse MADT IO-APIC entries
*/

9
arch/i386/kernel/mpparse.c
View File

@ -65,6 +65,8 @@ int nr_ioapics;
int pic_mode;
unsigned long mp_lapic_addr;
unsigned int def_to_bigsmp = 0;
/* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U;
/* Internal processor count */
@ -213,6 +215,13 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
ver = 0x10;
}
apic_version[m->mpc_apicid] = ver;
if ((num_processors > 8) &&
APIC_XAPIC(ver) &&
(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL))
def_to_bigsmp = 1;
else
def_to_bigsmp = 0;
bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
}

8
arch/i386/kernel/setup.c
View File

@ -1585,8 +1585,14 @@ void __init setup_arch(char **cmdline_p)
*/
acpi_boot_table_init();
acpi_boot_init();
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
if (def_to_bigsmp)
printk(KERN_WARNING "More than 8 CPUs detected and "
"CONFIG_X86_PC cannot handle it.\nUse "
"CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
#endif
#endif
#ifdef CONFIG_X86_LOCAL_APIC
if (smp_found_config)
get_smp_config();

5
arch/i386/mach-generic/bigsmp.c
View File

@ -47,7 +47,10 @@ static struct dmi_system_id __initdata bigsmp_dmi_table[] = {
static __init int probe_bigsmp(void)
{
dmi_check_system(bigsmp_dmi_table);
if (def_to_bigsmp)
dmi_bigsmp = 1;
else
dmi_check_system(bigsmp_dmi_table);
return dmi_bigsmp;
}

20
arch/i386/mach-generic/probe.c
View File

@ -30,6 +30,25 @@ struct genapic *apic_probe[] __initdata = {
NULL,
};
static int cmdline_apic;
void __init generic_bigsmp_probe(void)
{
/*
* This routine is used to switch to bigsmp mode when
* - There is no apic= option specified by the user
* - generic_apic_probe() has choosen apic_default as the sub_arch
* - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
*/
if (!cmdline_apic && genapic == &apic_default)
if (apic_bigsmp.probe()) {
genapic = &apic_bigsmp;
printk(KERN_INFO "Overriding APIC driver with %s\n",
genapic->name);
}
}
void __init generic_apic_probe(char *command_line)
{
char *s;
@ -52,6 +71,7 @@ void __init generic_apic_probe(char *command_line)
if (!changed)
printk(KERN_ERR "Unknown genapic `%s' specified.\n", s);
*p = old;
cmdline_apic = changed;
}
for (i = 0; !changed && apic_probe[i]; i++) {
if (apic_probe[i]->probe()) {

1
include/asm-i386/apicdef.h
View File

@ -16,6 +16,7 @@
#define GET_APIC_VERSION(x) ((x)&0xFF)
#define GET_APIC_MAXLVT(x) (((x)>>16)&0xFF)
#define APIC_INTEGRATED(x) ((x)&0xF0)
#define APIC_XAPIC(x) ((x) >= 0x14)
#define APIC_TASKPRI 0x80
#define APIC_TPRI_MASK 0xFF
#define APIC_ARBPRI 0x90

2
include/asm-i386/mach-generic/mach_apic.h
View File

@ -28,4 +28,6 @@
#define enable_apic_mode (genapic->enable_apic_mode)
#define phys_pkg_id (genapic->phys_pkg_id)
extern void generic_bigsmp_probe(void);
#endif /* __ASM_MACH_APIC_H */

1
include/asm-i386/mpspec.h
View File

@ -11,6 +11,7 @@ extern int mp_bus_id_to_local [MAX_MP_BUSSES];
extern int quad_local_to_mp_bus_id [NR_CPUS/4][4];
extern int mp_bus_id_to_pci_bus [MAX_MP_BUSSES];
extern unsigned int def_to_bigsmp;
extern unsigned int boot_cpu_physical_apicid;
extern int smp_found_config;
extern void find_smp_config (void);