2 * Copyright 2004 James Cleverdon, IBM.
3 * Subject to the GNU Public License, v.2
5 * Flat APIC subarch code.
7 * Hacked for x86-64 by James Cleverdon from i386 architecture code by
8 * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
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/init.h>
18 #include <linux/hardirq.h>
19 #include <linux/module.h>
25 #include <acpi/acpi_bus.h>
28 static struct apic apic_physflat;
29 static struct apic apic_flat;
31 struct apic __read_mostly *apic = &apic_flat;
32 EXPORT_SYMBOL_GPL(apic);
34 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
39 static const struct cpumask *flat_target_cpus(void)
41 return cpu_online_mask;
44 static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
46 /* Careful. Some cpus do not strictly honor the set of cpus
47 * specified in the interrupt destination when using lowest
48 * priority interrupt delivery mode.
50 * In particular there was a hyperthreading cpu observed to
51 * deliver interrupts to the wrong hyperthread when only one
52 * hyperthread was specified in the interrupt desitination.
54 cpumask_clear(retmask);
55 cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
59 * Set up the logical destination ID.
61 * Intel recommends to set DFR, LDR and TPR before enabling
62 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
63 * document number 292116). So here it goes...
65 void flat_init_apic_ldr(void)
68 unsigned long num, id;
70 num = smp_processor_id();
72 apic_write(APIC_DFR, APIC_DFR_FLAT);
73 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
74 val |= SET_APIC_LOGICAL_ID(id);
75 apic_write(APIC_LDR, val);
78 static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
82 local_irq_save(flags);
83 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
84 local_irq_restore(flags);
87 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
89 unsigned long mask = cpumask_bits(cpumask)[0];
91 _flat_send_IPI_mask(mask, vector);
95 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
97 unsigned long mask = cpumask_bits(cpumask)[0];
98 int cpu = smp_processor_id();
100 if (cpu < BITS_PER_LONG)
101 clear_bit(cpu, &mask);
103 _flat_send_IPI_mask(mask, vector);
106 static void flat_send_IPI_allbutself(int vector)
108 int cpu = smp_processor_id();
109 #ifdef CONFIG_HOTPLUG_CPU
114 if (hotplug || vector == NMI_VECTOR) {
115 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
116 unsigned long mask = cpumask_bits(cpu_online_mask)[0];
118 if (cpu < BITS_PER_LONG)
119 clear_bit(cpu, &mask);
121 _flat_send_IPI_mask(mask, vector);
123 } else if (num_online_cpus() > 1) {
124 __default_send_IPI_shortcut(APIC_DEST_ALLBUT,
125 vector, apic->dest_logical);
129 static void flat_send_IPI_all(int vector)
131 if (vector == NMI_VECTOR) {
132 flat_send_IPI_mask(cpu_online_mask, vector);
134 __default_send_IPI_shortcut(APIC_DEST_ALLINC,
135 vector, apic->dest_logical);
139 static unsigned int flat_get_apic_id(unsigned long x)
143 id = (((x)>>24) & 0xFFu);
148 static unsigned long set_apic_id(unsigned int id)
152 x = ((id & 0xFFu)<<24);
156 static unsigned int read_xapic_id(void)
160 id = flat_get_apic_id(apic_read(APIC_ID));
164 static int flat_apic_id_registered(void)
166 return physid_isset(read_xapic_id(), phys_cpu_present_map);
169 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
171 return initial_apic_id >> index_msb;
174 static int flat_probe(void)
179 static struct apic apic_flat = {
182 .acpi_madt_oem_check = flat_acpi_madt_oem_check,
183 .apic_id_valid = default_apic_id_valid,
184 .apic_id_registered = flat_apic_id_registered,
186 .irq_delivery_mode = dest_LowestPrio,
187 .irq_dest_mode = 1, /* logical */
189 .target_cpus = flat_target_cpus,
191 .dest_logical = APIC_DEST_LOGICAL,
192 .check_apicid_used = NULL,
193 .check_apicid_present = NULL,
195 .vector_allocation_domain = flat_vector_allocation_domain,
196 .init_apic_ldr = flat_init_apic_ldr,
198 .ioapic_phys_id_map = NULL,
199 .setup_apic_routing = NULL,
200 .multi_timer_check = NULL,
201 .cpu_present_to_apicid = default_cpu_present_to_apicid,
202 .apicid_to_cpu_present = NULL,
203 .setup_portio_remap = NULL,
204 .check_phys_apicid_present = default_check_phys_apicid_present,
205 .enable_apic_mode = NULL,
206 .phys_pkg_id = flat_phys_pkg_id,
207 .mps_oem_check = NULL,
209 .get_apic_id = flat_get_apic_id,
210 .set_apic_id = set_apic_id,
211 .apic_id_mask = 0xFFu << 24,
213 .cpu_mask_to_apicid = default_cpu_mask_to_apicid,
214 .cpu_mask_to_apicid_and = default_cpu_mask_to_apicid_and,
216 .send_IPI_mask = flat_send_IPI_mask,
217 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
218 .send_IPI_allbutself = flat_send_IPI_allbutself,
219 .send_IPI_all = flat_send_IPI_all,
220 .send_IPI_self = apic_send_IPI_self,
222 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
223 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
224 .wait_for_init_deassert = NULL,
225 .smp_callin_clear_local_apic = NULL,
226 .inquire_remote_apic = default_inquire_remote_apic,
228 .read = native_apic_mem_read,
229 .write = native_apic_mem_write,
230 .icr_read = native_apic_icr_read,
231 .icr_write = native_apic_icr_write,
232 .wait_icr_idle = native_apic_wait_icr_idle,
233 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
237 * Physflat mode is used when there are more than 8 CPUs on a system.
238 * We cannot use logical delivery in this case because the mask
239 * overflows, so use physical mode.
241 static int physflat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
245 * Quirk: some x86_64 machines can only use physical APIC mode
246 * regardless of how many processors are present (x86_64 ES7000
249 if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
250 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
251 printk(KERN_DEBUG "system APIC only can use physical flat");
255 if (!strncmp(oem_id, "IBM", 3) && !strncmp(oem_table_id, "EXA", 3)) {
256 printk(KERN_DEBUG "IBM Summit detected, will use apic physical");
264 static const struct cpumask *physflat_target_cpus(void)
266 return cpu_online_mask;
269 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
271 cpumask_clear(retmask);
272 cpumask_set_cpu(cpu, retmask);
275 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
277 default_send_IPI_mask_sequence_phys(cpumask, vector);
280 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
283 default_send_IPI_mask_allbutself_phys(cpumask, vector);
286 static void physflat_send_IPI_allbutself(int vector)
288 default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
291 static void physflat_send_IPI_all(int vector)
293 physflat_send_IPI_mask(cpu_online_mask, vector);
296 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
301 * We're using fixed IRQ delivery, can only return one phys APIC ID.
302 * May as well be the first.
304 cpu = cpumask_first(cpumask);
305 if ((unsigned)cpu < nr_cpu_ids)
306 return per_cpu(x86_cpu_to_apicid, cpu);
312 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
313 const struct cpumask *andmask)
318 * We're using fixed IRQ delivery, can only return one phys APIC ID.
319 * May as well be the first.
321 for_each_cpu_and(cpu, cpumask, andmask) {
322 if (cpumask_test_cpu(cpu, cpu_online_mask))
325 return per_cpu(x86_cpu_to_apicid, cpu);
328 static int physflat_probe(void)
330 if (apic == &apic_physflat || num_possible_cpus() > 8)
336 static struct apic apic_physflat = {
338 .name = "physical flat",
339 .probe = physflat_probe,
340 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
341 .apic_id_valid = default_apic_id_valid,
342 .apic_id_registered = flat_apic_id_registered,
344 .irq_delivery_mode = dest_Fixed,
345 .irq_dest_mode = 0, /* physical */
347 .target_cpus = physflat_target_cpus,
350 .check_apicid_used = NULL,
351 .check_apicid_present = NULL,
353 .vector_allocation_domain = physflat_vector_allocation_domain,
354 /* not needed, but shouldn't hurt: */
355 .init_apic_ldr = flat_init_apic_ldr,
357 .ioapic_phys_id_map = NULL,
358 .setup_apic_routing = NULL,
359 .multi_timer_check = NULL,
360 .cpu_present_to_apicid = default_cpu_present_to_apicid,
361 .apicid_to_cpu_present = NULL,
362 .setup_portio_remap = NULL,
363 .check_phys_apicid_present = default_check_phys_apicid_present,
364 .enable_apic_mode = NULL,
365 .phys_pkg_id = flat_phys_pkg_id,
366 .mps_oem_check = NULL,
368 .get_apic_id = flat_get_apic_id,
369 .set_apic_id = set_apic_id,
370 .apic_id_mask = 0xFFu << 24,
372 .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
373 .cpu_mask_to_apicid_and = physflat_cpu_mask_to_apicid_and,
375 .send_IPI_mask = physflat_send_IPI_mask,
376 .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself,
377 .send_IPI_allbutself = physflat_send_IPI_allbutself,
378 .send_IPI_all = physflat_send_IPI_all,
379 .send_IPI_self = apic_send_IPI_self,
381 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
382 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
383 .wait_for_init_deassert = NULL,
384 .smp_callin_clear_local_apic = NULL,
385 .inquire_remote_apic = default_inquire_remote_apic,
387 .read = native_apic_mem_read,
388 .write = native_apic_mem_write,
389 .icr_read = native_apic_icr_read,
390 .icr_write = native_apic_icr_write,
391 .wait_icr_idle = native_apic_wait_icr_idle,
392 .safe_wait_icr_idle = native_safe_apic_wait_icr_idle,
396 * We need to check for physflat first, so this order is important.
398 apic_drivers(apic_physflat, apic_flat);