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 __read_mostly *apic = &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 unsigned int id; 120 121 id = (((x)>>24) & 0xFFu); 122 123 return id; 124 } 125 126 static unsigned long set_apic_id(unsigned int id) 127 { 128 unsigned long x; 129 130 x = ((id & 0xFFu)<<24); 131 return x; 132 } 133 134 static unsigned int read_xapic_id(void) 135 { 136 unsigned int id; 137 138 id = flat_get_apic_id(apic_read(APIC_ID)); 139 return id; 140 } 141 142 static int flat_apic_id_registered(void) 143 { 144 return physid_isset(read_xapic_id(), phys_cpu_present_map); 145 } 146 147 static int flat_phys_pkg_id(int initial_apic_id, int index_msb) 148 { 149 return initial_apic_id >> index_msb; 150 } 151 152 static int flat_probe(void) 153 { 154 return 1; 155 } 156 157 static struct apic apic_flat = { 158 .name = "flat", 159 .probe = flat_probe, 160 .acpi_madt_oem_check = flat_acpi_madt_oem_check, 161 .apic_id_valid = default_apic_id_valid, 162 .apic_id_registered = flat_apic_id_registered, 163 164 .irq_delivery_mode = dest_LowestPrio, 165 .irq_dest_mode = 1, /* logical */ 166 167 .target_cpus = online_target_cpus, 168 .disable_esr = 0, 169 .dest_logical = APIC_DEST_LOGICAL, 170 .check_apicid_used = NULL, 171 172 .vector_allocation_domain = flat_vector_allocation_domain, 173 .init_apic_ldr = flat_init_apic_ldr, 174 175 .ioapic_phys_id_map = NULL, 176 .setup_apic_routing = NULL, 177 .cpu_present_to_apicid = default_cpu_present_to_apicid, 178 .apicid_to_cpu_present = NULL, 179 .check_phys_apicid_present = default_check_phys_apicid_present, 180 .phys_pkg_id = flat_phys_pkg_id, 181 182 .get_apic_id = flat_get_apic_id, 183 .set_apic_id = set_apic_id, 184 185 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and, 186 187 .send_IPI = default_send_IPI_single, 188 .send_IPI_mask = flat_send_IPI_mask, 189 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself, 190 .send_IPI_allbutself = flat_send_IPI_allbutself, 191 .send_IPI_all = flat_send_IPI_all, 192 .send_IPI_self = apic_send_IPI_self, 193 194 .inquire_remote_apic = default_inquire_remote_apic, 195 196 .read = native_apic_mem_read, 197 .write = native_apic_mem_write, 198 .eoi_write = native_apic_mem_write, 199 .icr_read = native_apic_icr_read, 200 .icr_write = native_apic_icr_write, 201 .wait_icr_idle = native_apic_wait_icr_idle, 202 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 203 }; 204 205 /* 206 * Physflat mode is used when there are more than 8 CPUs on a system. 207 * We cannot use logical delivery in this case because the mask 208 * overflows, so use physical mode. 209 */ 210 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id) 211 { 212 #ifdef CONFIG_ACPI 213 /* 214 * Quirk: some x86_64 machines can only use physical APIC mode 215 * regardless of how many processors are present (x86_64 ES7000 216 * is an example). 217 */ 218 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID && 219 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) { 220 printk(KERN_DEBUG "system APIC only can use physical flat"); 221 return 1; 222 } 223 224 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) { 225 printk(KERN_DEBUG "IBM Summit detected, will use apic physical"); 226 return 1; 227 } 228 #endif 229 230 return 0; 231 } 232 233 static void physflat_send_IPI_allbutself(int vector) 234 { 235 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector); 236 } 237 238 static void physflat_send_IPI_all(int vector) 239 { 240 default_send_IPI_mask_sequence_phys(cpu_online_mask, vector); 241 } 242 243 static int physflat_probe(void) 244 { 245 if (apic == &apic_physflat || num_possible_cpus() > 8) 246 return 1; 247 248 return 0; 249 } 250 251 static struct apic apic_physflat = { 252 253 .name = "physical flat", 254 .probe = physflat_probe, 255 .acpi_madt_oem_check = physflat_acpi_madt_oem_check, 256 .apic_id_valid = default_apic_id_valid, 257 .apic_id_registered = flat_apic_id_registered, 258 259 .irq_delivery_mode = dest_Fixed, 260 .irq_dest_mode = 0, /* physical */ 261 262 .target_cpus = online_target_cpus, 263 .disable_esr = 0, 264 .dest_logical = 0, 265 .check_apicid_used = NULL, 266 267 .vector_allocation_domain = default_vector_allocation_domain, 268 /* not needed, but shouldn't hurt: */ 269 .init_apic_ldr = flat_init_apic_ldr, 270 271 .ioapic_phys_id_map = NULL, 272 .setup_apic_routing = NULL, 273 .cpu_present_to_apicid = default_cpu_present_to_apicid, 274 .apicid_to_cpu_present = NULL, 275 .check_phys_apicid_present = default_check_phys_apicid_present, 276 .phys_pkg_id = flat_phys_pkg_id, 277 278 .get_apic_id = flat_get_apic_id, 279 .set_apic_id = set_apic_id, 280 281 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and, 282 283 .send_IPI = default_send_IPI_single_phys, 284 .send_IPI_mask = default_send_IPI_mask_sequence_phys, 285 .send_IPI_mask_allbutself = default_send_IPI_mask_allbutself_phys, 286 .send_IPI_allbutself = physflat_send_IPI_allbutself, 287 .send_IPI_all = physflat_send_IPI_all, 288 .send_IPI_self = apic_send_IPI_self, 289 290 .inquire_remote_apic = default_inquire_remote_apic, 291 292 .read = native_apic_mem_read, 293 .write = native_apic_mem_write, 294 .eoi_write = native_apic_mem_write, 295 .icr_read = native_apic_icr_read, 296 .icr_write = native_apic_icr_write, 297 .wait_icr_idle = native_apic_wait_icr_idle, 298 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle, 299 }; 300 301 /* 302 * We need to check for physflat first, so this order is important. 303 */ 304 apic_drivers(apic_physflat, apic_flat); 305