Messages in this thread Patch in this message | | | From | Yinghai Lu <> | Subject | [PATCH] x86: introduce max_physical_apicid for bigsmp switching | Date | Sun, 8 Jun 2008 18:29:22 -0700 |
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one multi-sockets system with 3 or 4 ioapics, when 4 dualcore cpus or 2 quadcore cpus installed, need to switch to bigsmp or physflat. because cpu apic id is [4,11] instead of [0,7], and we need to check max apic id instead of cpu numbers.
also add check for 32 bit when acpi is not compiled in or acpi=off
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Index: linux-2.6/arch/x86/kernel/apic_32.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/apic_32.c +++ linux-2.6/arch/x86/kernel/apic_32.c @@ -1520,6 +1520,9 @@ void __cpuinit generic_processor_info(in */ cpu = 0; + if (apicid > max_physical_apicid) + max_physical_apicid = apicid; + /* * Would be preferable to switch to bigsmp when CONFIG_HOTPLUG_CPU=y * but we need to work other dependencies like SMP_SUSPEND etc @@ -1527,7 +1530,7 @@ void __cpuinit generic_processor_info(in * if (CPU_HOTPLUG_ENABLED || num_processors > 8) * - Ashok Raj <ashok.raj@intel.com> */ - if (num_processors > 8) { + if (max_physical_apicid >= 8) { switch (boot_cpu_data.x86_vendor) { case X86_VENDOR_INTEL: if (!APIC_XAPIC(version)) { Index: linux-2.6/arch/x86/kernel/apic_64.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/apic_64.c +++ linux-2.6/arch/x86/kernel/apic_64.c @@ -1092,6 +1092,9 @@ void __cpuinit generic_processor_info(in */ cpu = 0; } + if (apicid > max_physical_apicid) + max_physical_apicid = apicid; + /* are we being called early in kernel startup? */ if (early_per_cpu_ptr(x86_cpu_to_apicid)) { u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid); Index: linux-2.6/arch/x86/kernel/genapic_64.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/genapic_64.c +++ linux-2.6/arch/x86/kernel/genapic_64.c @@ -51,7 +51,7 @@ void __init setup_apic_routing(void) else #endif - if (num_possible_cpus() <= 8) + if (max_physical_apicid < 8) genapic = &apic_flat; else genapic = &apic_physflat; Index: linux-2.6/arch/x86/kernel/mpparse.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/mpparse.c +++ linux-2.6/arch/x86/kernel/mpparse.c @@ -473,6 +473,11 @@ static int __init smp_read_mpc(struct mp ++mpc_record; #endif } + +#ifdef CONFIG_X86_GENERICARCH + generic_bigsmp_probe(); +#endif + setup_apic_routing(); if (!num_processors) printk(KERN_ERR "MPTABLE: no processors registered!\n"); Index: linux-2.6/arch/x86/kernel/setup.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/setup.c +++ linux-2.6/arch/x86/kernel/setup.c @@ -17,6 +17,7 @@ unsigned int num_processors; unsigned disabled_cpus __cpuinitdata; /* Processor that is doing the boot up */ unsigned int boot_cpu_physical_apicid = -1U; +unsigned int max_physical_apicid; EXPORT_SYMBOL(boot_cpu_physical_apicid); /* Bitmask of physically existing CPUs */ Index: linux-2.6/arch/x86/kernel/setup_32.c =================================================================== --- linux-2.6.orig/arch/x86/kernel/setup_32.c +++ linux-2.6/arch/x86/kernel/setup_32.c @@ -838,18 +838,17 @@ void __init setup_arch(char **cmdline_p) #ifdef CONFIG_ACPI acpi_boot_init(); - +#endif +#if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS) + if (smp_found_config) + get_smp_config(); +#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 -#if defined(CONFIG_X86_MPPARSE) || defined(CONFIG_X86_VISWS) - if (smp_found_config) - get_smp_config(); -#endif e820_setup_gap(); e820_mark_nosave_regions(max_low_pfn); Index: linux-2.6/arch/x86/mach-generic/bigsmp.c =================================================================== --- linux-2.6.orig/arch/x86/mach-generic/bigsmp.c +++ linux-2.6/arch/x86/mach-generic/bigsmp.c @@ -48,7 +48,7 @@ static const struct dmi_system_id bigsmp static int probe_bigsmp(void) { if (def_to_bigsmp) - dmi_bigsmp = 1; + dmi_bigsmp = 1; else dmi_check_system(bigsmp_dmi_table); return dmi_bigsmp; Index: linux-2.6/include/asm-x86/mpspec.h =================================================================== --- linux-2.6.orig/include/asm-x86/mpspec.h +++ linux-2.6/include/asm-x86/mpspec.h @@ -33,6 +33,7 @@ extern int mp_bus_id_to_type[MAX_MP_BUSS extern DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES); extern unsigned int boot_cpu_physical_apicid; +extern unsigned int max_physical_apicid; extern int smp_found_config; extern int mpc_default_type; extern unsigned long mp_lapic_addr;
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