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/threads.h>
12 #include <linux/cpumask.h>
13 #include <linux/string.h>
14 #include <linux/kernel.h>
15 #include <linux/ctype.h>
16 #include <linux/init.h>
19 #include <asm/genapic.h>
21 static cpumask_t flat_target_cpus(void)
23 return cpu_online_map;
26 static cpumask_t flat_vector_allocation_domain(int cpu)
28 /* Careful. Some cpus do not strictly honor the set of cpus
29 * specified in the interrupt destination when using lowest
30 * priority interrupt delivery mode.
32 * In particular there was a hyperthreading cpu observed to
33 * deliver interrupts to the wrong hyperthread when only one
34 * hyperthread was specified in the interrupt desitination.
36 cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
41 * Set up the logical destination ID.
43 * Intel recommends to set DFR, LDR and TPR before enabling
44 * an APIC. See e.g. "AP-388 82489DX User's Manual" (Intel
45 * document number 292116). So here it goes...
47 static void flat_init_apic_ldr(void)
50 unsigned long num, id;
52 num = smp_processor_id();
54 x86_cpu_to_log_apicid[num] = id;
55 apic_write(APIC_DFR, APIC_DFR_FLAT);
56 val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
57 val |= SET_APIC_LOGICAL_ID(id);
58 apic_write(APIC_LDR, val);
61 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
63 unsigned long mask = cpus_addr(cpumask)[0];
67 local_irq_save(flags);
75 * prepare target chip field
77 cfg = __prepare_ICR2(mask);
78 apic_write(APIC_ICR2, cfg);
83 cfg = __prepare_ICR(0, vector, APIC_DEST_LOGICAL);
86 * Send the IPI. The write to APIC_ICR fires this off.
88 apic_write(APIC_ICR, cfg);
89 local_irq_restore(flags);
92 static void flat_send_IPI_allbutself(int vector)
94 #ifdef CONFIG_HOTPLUG_CPU
99 if (hotplug || vector == NMI_VECTOR) {
100 cpumask_t allbutme = cpu_online_map;
102 cpu_clear(smp_processor_id(), allbutme);
104 if (!cpus_empty(allbutme))
105 flat_send_IPI_mask(allbutme, vector);
106 } else if (num_online_cpus() > 1) {
107 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
111 static void flat_send_IPI_all(int vector)
113 if (vector == NMI_VECTOR)
114 flat_send_IPI_mask(cpu_online_map, vector);
116 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
119 static int flat_apic_id_registered(void)
121 return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map);
124 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
126 return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
129 static unsigned int phys_pkg_id(int index_msb)
131 return hard_smp_processor_id() >> index_msb;
134 struct genapic apic_flat = {
136 .int_delivery_mode = dest_LowestPrio,
137 .int_dest_mode = (APIC_DEST_LOGICAL != 0),
138 .target_cpus = flat_target_cpus,
139 .vector_allocation_domain = flat_vector_allocation_domain,
140 .apic_id_registered = flat_apic_id_registered,
141 .init_apic_ldr = flat_init_apic_ldr,
142 .send_IPI_all = flat_send_IPI_all,
143 .send_IPI_allbutself = flat_send_IPI_allbutself,
144 .send_IPI_mask = flat_send_IPI_mask,
145 .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
146 .phys_pkg_id = phys_pkg_id,
150 * Physflat mode is used when there are more than 8 CPUs on a AMD system.
151 * We cannot use logical delivery in this case because the mask
152 * overflows, so use physical mode.
155 static cpumask_t physflat_target_cpus(void)
157 return cpu_online_map;
160 static cpumask_t physflat_vector_allocation_domain(int cpu)
162 cpumask_t domain = CPU_MASK_NONE;
163 cpu_set(cpu, domain);
168 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
170 send_IPI_mask_sequence(cpumask, vector);
173 static void physflat_send_IPI_allbutself(int vector)
175 cpumask_t allbutme = cpu_online_map;
177 cpu_clear(smp_processor_id(), allbutme);
178 physflat_send_IPI_mask(allbutme, vector);
181 static void physflat_send_IPI_all(int vector)
183 physflat_send_IPI_mask(cpu_online_map, vector);
186 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
191 * We're using fixed IRQ delivery, can only return one phys APIC ID.
192 * May as well be the first.
194 cpu = first_cpu(cpumask);
195 if ((unsigned)cpu < NR_CPUS)
196 return x86_cpu_to_apicid[cpu];
201 struct genapic apic_physflat = {
202 .name = "physical flat",
203 .int_delivery_mode = dest_Fixed,
204 .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
205 .target_cpus = physflat_target_cpus,
206 .vector_allocation_domain = physflat_vector_allocation_domain,
207 .apic_id_registered = flat_apic_id_registered,
208 .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
209 .send_IPI_all = physflat_send_IPI_all,
210 .send_IPI_allbutself = physflat_send_IPI_allbutself,
211 .send_IPI_mask = physflat_send_IPI_mask,
212 .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
213 .phys_pkg_id = phys_pkg_id,