1 /* 2 * Copyright 2004 James Cleverdon, IBM. 3 * Subject to the GNU Public License, v.2 4 * 5 * Flat APIC subarch code. 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/errno.h> 12 #include <linux/threads.h> 13 #include <linux/cpumask.h> 14 #include <linux/string.h> 15 #include <linux/kernel.h> 16 #include <linux/ctype.h> 17 #include <linux/hardirq.h> 18 #include <linux/export.h> 19 #include <asm/smp.h> 20 #include <asm/apic.h> 21 #include <asm/ipi.h> 22 23 #include <linux/acpi.h> 24 25 static struct apic apic_physflat; 26 static struct apic apic_flat; 27 28 struct apic *apic __ro_after_init = &apic_flat; 29 EXPORT_SYMBOL_GPL(apic); 30 31 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 32 { 33 return 1; 34 } 35 36 /* 37 * Set up the logical destination ID. 38 * 39 * Intel recommends to set DFR, LDR and TPR before enabling 40 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel 41 * document number 292116). So here it goes... 42 */ 43 void flat_init_apic_ldr(void) 44 { 45 unsigned long val; 46 unsigned long num, id; 47 48 num = smp_processor_id(); 49 id = 1UL << num; 50 apic_write(APIC_DFR, APIC_DFR_FLAT); 51 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK; 52 val |= SET_APIC_LOGICAL_ID(id); 53 apic_write(APIC_LDR, val); 54 } 55 56 static void _flat_send_IPI_mask(unsigned long mask, int vector) 57 { 58 unsigned long flags; 59 60 local_irq_save(flags); 61 __default_send_IPI_dest_field(mask, vector, apic->dest_logical); 62 local_irq_restore(flags); 63 } 64 65 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector) 66 { 67 unsigned long mask = cpumask_bits(cpumask)[0]; 68 69 _flat_send_IPI_mask(mask, vector); 70 } 71 72 static void 73 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector) 74 { 75 unsigned long mask = cpumask_bits(cpumask)[0]; 76 int cpu = smp_processor_id(); 77 78 if (cpu < BITS_PER_LONG) 79 clear_bit(cpu, &mask); 80 81 _flat_send_IPI_mask(mask, vector); 82 } 83 84 static void flat_send_IPI_allbutself(int vector) 85 { 86 int cpu = smp_processor_id(); 87 #ifdef CONFIG_HOTPLUG_CPU 88 int hotplug = 1; 89 #else 90 int hotplug = 0; 91 #endif 92 if (hotplug || vector == NMI_VECTOR) { 93 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) { 94 unsigned long mask = cpumask_bits(cpu_online_mask)[0]; 95 96 if (cpu < BITS_PER_LONG) 97 clear_bit(cpu, &mask); 98 99 _flat_send_IPI_mask(mask, vector); 100 } 101 } else if (num_online_cpus() > 1) { 102 __default_send_IPI_shortcut(APIC_DEST_ALLBUT, 103 vector, apic->dest_logical); 104 } 105 } 106 107 static void flat_send_IPI_all(int vector) 108 { 109 if (vector == NMI_VECTOR) { 110 flat_send_IPI_mask(cpu_online_mask, vector); 111 } else { 112 __default_send_IPI_shortcut(APIC_DEST_ALLINC, 113 vector, apic->dest_logical); 114 } 115 } 116 117 static unsigned int flat_get_apic_id(unsigned long x) 118 { 119 return (x >> 24) & 0xFF; 120 } 121 122 static u32 set_apic_id(unsigned int id) 123 { 124 return (id & 0xFF) << 24; 125 } 126 127 static unsigned int read_xapic_id(void) 128 { 129 return flat_get_apic_id(apic_read(APIC_ID)); 130 } 131 132 static int flat_apic_id_registered(void) 133 { 134 return physid_isset(read_xapic_id(), phys_cpu_present_map); 135 } 136 137 static int flat_phys_pkg_id(int initial_apic_id, int index_msb) 138 { 139 return initial_apic_id >> index_msb; 140 } 141 142 static int flat_probe(void) 143 { 144 return 1; 145 } 146 147 static struct apic apic_flat __ro_after_init = { 148 .name = "flat", 149 .probe = flat_probe, 150 .acpi_madt_oem_check = flat_acpi_madt_oem_check, 151 .apic_id_valid = default_apic_id_valid, 152 .apic_id_registered = flat_apic_id_registered, 153 154 .irq_delivery_mode = dest_LowestPrio, 155 .irq_dest_mode = 1, /* logical */ 156 157 .disable_esr = 0, 158 .dest_logical = APIC_DEST_LOGICAL, 159 .check_apicid_used = NULL, 160 161 .init_apic_ldr = flat_init_apic_ldr, 162 163 .ioapic_phys_id_map = NULL, 164 .setup_apic_routing = NULL, 165 .cpu_present_to_apicid = default_cpu_present_to_apicid, 166 .apicid_to_cpu_present = NULL, 167 .check_phys_apicid_present = default_check_phys_apicid_present, 168 .phys_pkg_id = flat_phys_pkg_id, 169 170 .get_apic_id = flat_get_apic_id, 171 .set_apic_id = set_apic_id, 172 173 .calc_dest_apicid = apic_flat_calc_apicid, 174 175 .send_IPI = default_send_IPI_single, 176 .send_IPI_mask = flat_send_IPI_mask, 177 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, 178 .send_IPI_allbutself = flat_send_IPI_allbutself, 179 .send_IPI_all = flat_send_IPI_all, 180 .send_IPI_self = apic_send_IPI_self, 181 182 .inquire_remote_apic = default_inquire_remote_apic, 183 184 .read = native_apic_mem_read, 185 .write = native_apic_mem_write, 186 .eoi_write = native_apic_mem_write, 187 .icr_read = native_apic_icr_read, 188 .icr_write = native_apic_icr_write, 189 .wait_icr_idle = native_apic_wait_icr_idle, 190 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 191 }; 192 193 /* 194 * Physflat mode is used when there are more than 8 CPUs on a system. 195 * We cannot use logical delivery in this case because the mask 196 * overflows, so use physical mode. 197 */ 198 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 199 { 200 #ifdef CONFIG_ACPI 201 /* 202 * Quirk: some x86_64 machines can only use physical APIC mode 203 * regardless of how many processors are present (x86_64 ES7000 204 * is an example). 205 */ 206 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && 207 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 208 printk(KERN_DEBUG "system APIC only can use physical flat"); 209 return 1; 210 } 211 212 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { 213 printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); 214 return 1; 215 } 216 #endif 217 218 return 0; 219 } 220 221 static void physflat_send_IPI_allbutself(int vector) 222 { 223 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 224 } 225 226 static void physflat_send_IPI_all(int vector) 227 { 228 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 229 } 230 231 static int physflat_probe(void) 232 { 233 if (apic == &apic_physflat || num_possible_cpus() > 8) 234 return 1; 235 236 return 0; 237 } 238 239 static struct apic apic_physflat __ro_after_init = { 240 241 .name = "physical flat", 242 .probe = physflat_probe, 243 .acpi_madt_oem_check = physflat_acpi_madt_oem_check, 244 .apic_id_valid = default_apic_id_valid, 245 .apic_id_registered = flat_apic_id_registered, 246 247 .irq_delivery_mode = dest_Fixed, 248 .irq_dest_mode = 0, /* physical */ 249 250 .disable_esr = 0, 251 .dest_logical = 0, 252 .check_apicid_used = NULL, 253 254 /* not needed, but shouldn't hurt: */ 255 .init_apic_ldr = flat_init_apic_ldr, 256 257 .ioapic_phys_id_map = NULL, 258 .setup_apic_routing = NULL, 259 .cpu_present_to_apicid = default_cpu_present_to_apicid, 260 .apicid_to_cpu_present = NULL, 261 .check_phys_apicid_present = default_check_phys_apicid_present, 262 .phys_pkg_id = flat_phys_pkg_id, 263 264 .get_apic_id = flat_get_apic_id, 265 .set_apic_id = set_apic_id, 266 267 .calc_dest_apicid = apic_default_calc_apicid, 268 269 .send_IPI = default_send_IPI_single_phys, 270 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 271 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys, 272 .send_IPI_allbutself = physflat_send_IPI_allbutself, 273 .send_IPI_all = physflat_send_IPI_all, 274 .send_IPI_self = apic_send_IPI_self, 275 276 .inquire_remote_apic = default_inquire_remote_apic, 277 278 .read = native_apic_mem_read, 279 .write = native_apic_mem_write, 280 .eoi_write = native_apic_mem_write, 281 .icr_read = native_apic_icr_read, 282 .icr_write = native_apic_icr_write, 283 .wait_icr_idle = native_apic_wait_icr_idle, 284 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 285 }; 286 287 /* 288 * We need to check for physflat first, so this order is important. 289 */ 290 apic_drivers(apic_physflat, apic_flat); 291