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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2005-09-03 18:56:31 -0400
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 03:06:10 -0400
commit911a62d42365076209e2c327e7688db296e35d62 (patch)
tree51e6d8525cd3547ea43129b5dd20339655674d57 /arch
parent484b90c4b965d54037ff99b198d84cdf144f8a35 (diff)
[PATCH] x86: sutomatically enable bigsmp when we have more than 8 CPUs
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/kernel/acpi/boot.c3
-rw-r--r--arch/i386/kernel/mpparse.c9
-rw-r--r--arch/i386/kernel/setup.c8
-rw-r--r--arch/i386/mach-generic/bigsmp.c5
-rw-r--r--arch/i386/mach-generic/probe.c20
5 files changed, 43 insertions, 2 deletions
diff --git a/arch/i386/kernel/acpi/boot.c b/arch/i386/kernel/acpi/boot.c
index b7808a89d945..34ee500c26e5 100644
--- a/arch/i386/kernel/acpi/boot.c
+++ b/arch/i386/kernel/acpi/boot.c
@@ -833,6 +833,9 @@ acpi_process_madt(void)
833 if (!error) { 833 if (!error) {
834 acpi_lapic = 1; 834 acpi_lapic = 1;
835 835
836#ifdef CONFIG_X86_GENERICARCH
837 generic_bigsmp_probe();
838#endif
836 /* 839 /*
837 * Parse MADT IO-APIC entries 840 * Parse MADT IO-APIC entries
838 */ 841 */
diff --git a/arch/i386/kernel/mpparse.c b/arch/i386/kernel/mpparse.c
index ce838abb27d8..788efffa9930 100644
--- a/arch/i386/kernel/mpparse.c
+++ b/arch/i386/kernel/mpparse.c
@@ -65,6 +65,8 @@ int nr_ioapics;
65int pic_mode; 65int pic_mode;
66unsigned long mp_lapic_addr; 66unsigned long mp_lapic_addr;
67 67
68unsigned int def_to_bigsmp = 0;
69
68/* Processor that is doing the boot up */ 70/* Processor that is doing the boot up */
69unsigned int boot_cpu_physical_apicid = -1U; 71unsigned int boot_cpu_physical_apicid = -1U;
70/* Internal processor count */ 72/* Internal processor count */
@@ -213,6 +215,13 @@ static void __init MP_processor_info (struct mpc_config_processor *m)
213 ver = 0x10; 215 ver = 0x10;
214 } 216 }
215 apic_version[m->mpc_apicid] = ver; 217 apic_version[m->mpc_apicid] = ver;
218 if ((num_processors > 8) &&
219 APIC_XAPIC(ver) &&
220 (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL))
221 def_to_bigsmp = 1;
222 else
223 def_to_bigsmp = 0;
224
216 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid; 225 bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
217} 226}
218 227
diff --git a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
index 9adbf710ec8d..294bcca985ab 100644
--- a/arch/i386/kernel/setup.c
+++ b/arch/i386/kernel/setup.c
@@ -1585,8 +1585,14 @@ void __init setup_arch(char **cmdline_p)
1585 */ 1585 */
1586 acpi_boot_table_init(); 1586 acpi_boot_table_init();
1587 acpi_boot_init(); 1587 acpi_boot_init();
1588#endif
1589 1588
1589#if defined(CONFIG_SMP) && defined(CONFIG_X86_PC)
1590 if (def_to_bigsmp)
1591 printk(KERN_WARNING "More than 8 CPUs detected and "
1592 "CONFIG_X86_PC cannot handle it.\nUse "
1593 "CONFIG_X86_GENERICARCH or CONFIG_X86_BIGSMP.\n");
1594#endif
1595#endif
1590#ifdef CONFIG_X86_LOCAL_APIC 1596#ifdef CONFIG_X86_LOCAL_APIC
1591 if (smp_found_config) 1597 if (smp_found_config)
1592 get_smp_config(); 1598 get_smp_config();
diff --git a/arch/i386/mach-generic/bigsmp.c b/arch/i386/mach-generic/bigsmp.c
index 25883b44f625..037b2af1a1f4 100644
--- a/arch/i386/mach-generic/bigsmp.c
+++ b/arch/i386/mach-generic/bigsmp.c
@@ -47,7 +47,10 @@ static struct dmi_system_id __initdata bigsmp_dmi_table[] = {
47 47
48static __init int probe_bigsmp(void) 48static __init int probe_bigsmp(void)
49{ 49{
50 dmi_check_system(bigsmp_dmi_table); 50 if (def_to_bigsmp)
51 dmi_bigsmp = 1;
52 else
53 dmi_check_system(bigsmp_dmi_table);
51 return dmi_bigsmp; 54 return dmi_bigsmp;
52} 55}
53 56
diff --git a/arch/i386/mach-generic/probe.c b/arch/i386/mach-generic/probe.c
index 5497c65a8790..cea5b3ce4b57 100644
--- a/arch/i386/mach-generic/probe.c
+++ b/arch/i386/mach-generic/probe.c
@@ -30,6 +30,25 @@ struct genapic *apic_probe[] __initdata = {
30 NULL, 30 NULL,
31}; 31};
32 32
33static int cmdline_apic;
34
35void __init generic_bigsmp_probe(void)
36{
37 /*
38 * This routine is used to switch to bigsmp mode when
39 * - There is no apic= option specified by the user
40 * - generic_apic_probe() has choosen apic_default as the sub_arch
41 * - we find more than 8 CPUs in acpi LAPIC listing with xAPIC support
42 */
43
44 if (!cmdline_apic && genapic == &apic_default)
45 if (apic_bigsmp.probe()) {
46 genapic = &apic_bigsmp;
47 printk(KERN_INFO "Overriding APIC driver with %s\n",
48 genapic->name);
49 }
50}
51
33void __init generic_apic_probe(char *command_line) 52void __init generic_apic_probe(char *command_line)
34{ 53{
35 char *s; 54 char *s;
@@ -52,6 +71,7 @@ void __init generic_apic_probe(char *command_line)
52 if (!changed) 71 if (!changed)
53 printk(KERN_ERR "Unknown genapic `%s' specified.\n", s); 72 printk(KERN_ERR "Unknown genapic `%s' specified.\n", s);
54 *p = old; 73 *p = old;
74 cmdline_apic = changed;
55 } 75 }
56 for (i = 0; !changed && apic_probe[i]; i++) { 76 for (i = 0; !changed && apic_probe[i]; i++) {
57 if (apic_probe[i]->probe()) { 77 if (apic_probe[i]->probe()) {