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>
21 #include <asm/genapic.h>
22 #include <mach_apicdef.h>
25 #include <acpi/acpi_bus.h>
28 static int flat_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
33 static const struct cpumask *flat_target_cpus(void)
35 return cpu_online_mask;
38 static void flat_vector_allocation_domain(int cpu, struct cpumask *retmask)
40 /* Careful. Some cpus do not strictly honor the set of cpus
41 * specified in the interrupt destination when using lowest
42 * priority interrupt delivery mode.
44 * In particular there was a hyperthreading cpu observed to
45 * deliver interrupts to the wrong hyperthread when only one
46 * hyperthread was specified in the interrupt desitination.
48 cpumask_clear(retmask);
49 cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
53 * Set up the logical destination ID.
55 * Intel recommends to set DFR, LDR and TPR before enabling
56 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
57 * document number 292116). So here it goes...
59 static void flat_init_apic_ldr(void)
62 unsigned long num, id;
64 num = smp_processor_id();
66 apic_write(APIC_DFR, APIC_DFR_FLAT);
67 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
68 val |= SET_APIC_LOGICAL_ID(id);
69 apic_write(APIC_LDR, val);
72 static inline void _flat_send_IPI_mask(unsigned long mask, int vector)
76 local_irq_save(flags);
77 __default_send_IPI_dest_field(mask, vector, apic->dest_logical);
78 local_irq_restore(flags);
81 static void flat_send_IPI_mask(const struct cpumask *cpumask, int vector)
83 unsigned long mask = cpumask_bits(cpumask)[0];
85 _flat_send_IPI_mask(mask, vector);
89 flat_send_IPI_mask_allbutself(const struct cpumask *cpumask, int vector)
91 unsigned long mask = cpumask_bits(cpumask)[0];
92 int cpu = smp_processor_id();
94 if (cpu < BITS_PER_LONG)
95 clear_bit(cpu, &mask);
97 _flat_send_IPI_mask(mask, vector);
100 static void flat_send_IPI_allbutself(int vector)
102 int cpu = smp_processor_id();
103 #ifdef CONFIG_HOTPLUG_CPU
108 if (hotplug || vector == NMI_VECTOR) {
109 if (!cpumask_equal(cpu_online_mask, cpumask_of(cpu))) {
110 unsigned long mask = cpumask_bits(cpu_online_mask)[0];
112 if (cpu < BITS_PER_LONG)
113 clear_bit(cpu, &mask);
115 _flat_send_IPI_mask(mask, vector);
117 } else if (num_online_cpus() > 1) {
118 __default_send_IPI_shortcut(APIC_DEST_ALLBUT,
119 vector, apic->dest_logical);
123 static void flat_send_IPI_all(int vector)
125 if (vector == NMI_VECTOR) {
126 flat_send_IPI_mask(cpu_online_mask, vector);
128 __default_send_IPI_shortcut(APIC_DEST_ALLINC,
129 vector, apic->dest_logical);
133 static unsigned int flat_get_apic_id(unsigned long x)
137 id = (((x)>>24) & 0xFFu);
142 static unsigned long set_apic_id(unsigned int id)
146 x = ((id & 0xFFu)<<24);
150 static unsigned int read_xapic_id(void)
154 id = flat_get_apic_id(apic_read(APIC_ID));
158 static int flat_apic_id_registered(void)
160 return physid_isset(read_xapic_id(), phys_cpu_present_map);
163 static unsigned int flat_cpu_mask_to_apicid(const struct cpumask *cpumask)
165 return cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
168 static unsigned int flat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
169 const struct cpumask *andmask)
171 unsigned long mask1 = cpumask_bits(cpumask)[0] & APIC_ALL_CPUS;
172 unsigned long mask2 = cpumask_bits(andmask)[0] & APIC_ALL_CPUS;
174 return mask1 & mask2;
177 static int flat_phys_pkg_id(int initial_apic_id, int index_msb)
179 return hard_smp_processor_id() >> index_msb;
182 struct genapic apic_flat = {
185 .acpi_madt_oem_check = flat_acpi_madt_oem_check,
186 .apic_id_registered = flat_apic_id_registered,
188 .irq_delivery_mode = dest_LowestPrio,
189 .irq_dest_mode = 1, /* logical */
191 .target_cpus = flat_target_cpus,
193 .dest_logical = APIC_DEST_LOGICAL,
194 .check_apicid_used = NULL,
195 .check_apicid_present = NULL,
197 .vector_allocation_domain = flat_vector_allocation_domain,
198 .init_apic_ldr = flat_init_apic_ldr,
200 .ioapic_phys_id_map = NULL,
201 .setup_apic_routing = NULL,
202 .multi_timer_check = NULL,
203 .apicid_to_node = NULL,
204 .cpu_to_logical_apicid = NULL,
205 .cpu_present_to_apicid = default_cpu_present_to_apicid,
206 .apicid_to_cpu_present = NULL,
207 .setup_portio_remap = NULL,
208 .check_phys_apicid_present = default_check_phys_apicid_present,
209 .enable_apic_mode = NULL,
210 .phys_pkg_id = flat_phys_pkg_id,
211 .mps_oem_check = NULL,
213 .get_apic_id = flat_get_apic_id,
214 .set_apic_id = set_apic_id,
215 .apic_id_mask = 0xFFu << 24,
217 .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
218 .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and,
220 .send_IPI_mask = flat_send_IPI_mask,
221 .send_IPI_mask_allbutself = flat_send_IPI_mask_allbutself,
222 .send_IPI_allbutself = flat_send_IPI_allbutself,
223 .send_IPI_all = flat_send_IPI_all,
224 .send_IPI_self = apic_send_IPI_self,
227 .trampoline_phys_low = 0,
228 .trampoline_phys_high = 0,
229 .wait_for_init_deassert = NULL,
230 .smp_callin_clear_local_apic = NULL,
231 .store_NMI_vector = NULL,
232 .restore_NMI_vector = NULL,
233 .inquire_remote_apic = NULL,
237 * Physflat mode is used when there are more than 8 CPUs on a AMD 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");
259 static const struct cpumask *physflat_target_cpus(void)
261 return cpu_online_mask;
264 static void physflat_vector_allocation_domain(int cpu, struct cpumask *retmask)
266 cpumask_clear(retmask);
267 cpumask_set_cpu(cpu, retmask);
270 static void physflat_send_IPI_mask(const struct cpumask *cpumask, int vector)
272 default_send_IPI_mask_sequence(cpumask, vector);
275 static void physflat_send_IPI_mask_allbutself(const struct cpumask *cpumask,
278 default_send_IPI_mask_allbutself(cpumask, vector);
281 static void physflat_send_IPI_allbutself(int vector)
283 default_send_IPI_mask_allbutself(cpu_online_mask, vector);
286 static void physflat_send_IPI_all(int vector)
288 physflat_send_IPI_mask(cpu_online_mask, vector);
291 static unsigned int physflat_cpu_mask_to_apicid(const struct cpumask *cpumask)
296 * We're using fixed IRQ delivery, can only return one phys APIC ID.
297 * May as well be the first.
299 cpu = cpumask_first(cpumask);
300 if ((unsigned)cpu < nr_cpu_ids)
301 return per_cpu(x86_cpu_to_apicid, cpu);
307 physflat_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
308 const struct cpumask *andmask)
313 * We're using fixed IRQ delivery, can only return one phys APIC ID.
314 * May as well be the first.
316 for_each_cpu_and(cpu, cpumask, andmask) {
317 if (cpumask_test_cpu(cpu, cpu_online_mask))
320 if (cpu < nr_cpu_ids)
321 return per_cpu(x86_cpu_to_apicid, cpu);
326 struct genapic apic_physflat = {
328 .name = "physical flat",
330 .acpi_madt_oem_check = physflat_acpi_madt_oem_check,
331 .apic_id_registered = flat_apic_id_registered,
333 .irq_delivery_mode = dest_Fixed,
334 .irq_dest_mode = 0, /* physical */
336 .target_cpus = physflat_target_cpus,
339 .check_apicid_used = NULL,
340 .check_apicid_present = NULL,
342 .vector_allocation_domain = physflat_vector_allocation_domain,
343 /* not needed, but shouldn't hurt: */
344 .init_apic_ldr = flat_init_apic_ldr,
346 .ioapic_phys_id_map = NULL,
347 .setup_apic_routing = NULL,
348 .multi_timer_check = NULL,
349 .apicid_to_node = NULL,
350 .cpu_to_logical_apicid = NULL,
351 .cpu_present_to_apicid = default_cpu_present_to_apicid,
352 .apicid_to_cpu_present = NULL,
353 .setup_portio_remap = NULL,
354 .check_phys_apicid_present = default_check_phys_apicid_present,
355 .enable_apic_mode = NULL,
356 .phys_pkg_id = flat_phys_pkg_id,
357 .mps_oem_check = NULL,
359 .get_apic_id = flat_get_apic_id,
360 .set_apic_id = set_apic_id,
361 .apic_id_mask = 0xFFu << 24,
363 .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
364 .cpu_mask_to_apicid_and = physflat_cpu_mask_to_apicid_and,
366 .send_IPI_mask = physflat_send_IPI_mask,
367 .send_IPI_mask_allbutself = physflat_send_IPI_mask_allbutself,
368 .send_IPI_allbutself = physflat_send_IPI_allbutself,
369 .send_IPI_all = physflat_send_IPI_all,
370 .send_IPI_self = apic_send_IPI_self,
373 .trampoline_phys_low = 0,
374 .trampoline_phys_high = 0,
375 .wait_for_init_deassert = NULL,
376 .smp_callin_clear_local_apic = NULL,
377 .store_NMI_vector = NULL,
378 .restore_NMI_vector = NULL,
379 .inquire_remote_apic = NULL,