1 /* 2 * Copyright 2004 James Cleverdon, IBM. 3 * Subject to the GNU Public License, v.2 4 * 5 * Generic APIC sub-arch probe layer. 6 * 7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by 8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and 9 * James Cleverdon. 10 */ 11 #include <linux/threads.h> 12 #include <linux/cpumask.h> 13 #include <linux/string.h> 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/ctype.h> 17 #include <linux/init.h> 18 #include <linux/hardirq.h> 19 #include <linux/dmar.h> 20 21 #include <asm/smp.h> 22 #include <asm/apic.h> 23 #include <asm/ipi.h> 24 #include <asm/setup.h> 25 26 extern struct apic apic_flat; 27 extern struct apic apic_physflat; 28 extern struct apic apic_x2xpic_uv_x; 29 extern struct apic apic_x2apic_phys; 30 extern struct apic apic_x2apic_cluster; 31 32 struct apic __read_mostly *apic = &apic_flat; 33 EXPORT_SYMBOL_GPL(apic); 34 35 static struct apic *apic_probe[] __initdata = { 36 #ifdef CONFIG_X86_UV 37 &apic_x2apic_uv_x, 38 #endif 39 #ifdef CONFIG_X86_X2APIC 40 &apic_x2apic_phys, 41 &apic_x2apic_cluster, 42 #endif 43 &apic_physflat, 44 NULL, 45 }; 46 47 static int apicid_phys_pkg_id(int initial_apic_id, int index_msb) 48 { 49 return hard_smp_processor_id() >> index_msb; 50 } 51 52 /* 53 * Check the APIC IDs in bios_cpu_apicid and choose the APIC mode. 54 */ 55 void __init default_setup_apic_routing(void) 56 { 57 #ifdef CONFIG_X86_X2APIC 58 if (x2apic_mode 59 #ifdef CONFIG_X86_UV 60 && apic != &apic_x2apic_uv_x 61 #endif 62 ) { 63 if (x2apic_phys) 64 apic = &apic_x2apic_phys; 65 else 66 apic = &apic_x2apic_cluster; 67 } 68 #endif 69 70 if (apic == &apic_flat) { 71 switch (boot_cpu_data.x86_vendor) { 72 case X86_VENDOR_INTEL: 73 if (num_processors > 8) 74 apic = &apic_physflat; 75 break; 76 case X86_VENDOR_AMD: 77 if (max_physical_apicid >= 8) 78 apic = &apic_physflat; 79 } 80 } 81 82 printk(KERN_INFO "Setting APIC routing to %s\n", apic->name); 83 84 if (is_vsmp_box()) { 85 /* need to update phys_pkg_id */ 86 apic->phys_pkg_id = apicid_phys_pkg_id; 87 } 88 89 /* 90 * Now that apic routing model is selected, configure the 91 * fault handling for intr remapping. 92 */ 93 if (intr_remapping_enabled) 94 enable_drhd_fault_handling(); 95 } 96 97 /* Same for both flat and physical. */ 98 99 void apic_send_IPI_self(int vector) 100 { 101 __default_send_IPI_shortcut(APIC_DEST_SELF, vector, APIC_DEST_PHYSICAL); 102 } 103 104 int __init default_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 105 { 106 int i; 107 108 for (i = 0; apic_probe[i]; ++i) { 109 if (apic_probe[i]->acpi_madt_oem_check(oem_id, oem_table_id)) { 110 apic = apic_probe[i]; 111 printk(KERN_INFO "Setting APIC routing to %s.\n", 112 apic->name); 113 return 1; 114 } 115 } 116 return 0; 117 } 118