1 #include <linux/threads.h>
2 #include <linux/cpumask.h>
3 #include <linux/string.h>
4 #include <linux/kernel.h>
5 #include <linux/ctype.h>
6 #include <linux/init.h>
7 #include <linux/dmar.h>
11 #include <asm/x2apic.h>
13 static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
14 static DEFINE_PER_CPU(cpumask_var_t, cpus_in_cluster);
15 static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
17 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
19 return x2apic_enabled();
22 static inline u32 x2apic_cluster(int cpu)
24 return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
28 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
30 struct cpumask *cpus_in_cluster_ptr;
31 struct cpumask *ipi_mask_ptr;
32 unsigned int cpu, this_cpu;
38 local_irq_save(flags);
40 this_cpu = smp_processor_id();
43 * We are to modify mask, so we need an own copy
44 * and be sure it's manipulated with irq off.
46 ipi_mask_ptr = __raw_get_cpu_var(ipi_mask);
47 cpumask_copy(ipi_mask_ptr, mask);
50 * The idea is to send one IPI per cluster.
52 for_each_cpu(cpu, ipi_mask_ptr) {
55 cpus_in_cluster_ptr = per_cpu(cpus_in_cluster, cpu);
58 /* Collect cpus in cluster. */
59 for_each_cpu_and(i, ipi_mask_ptr, cpus_in_cluster_ptr) {
60 if (apic_dest == APIC_DEST_ALLINC || i != this_cpu)
61 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
67 __x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
69 * Cluster sibling cpus should be discared now so
70 * we would not send IPI them second time.
72 cpumask_andnot(ipi_mask_ptr, ipi_mask_ptr, cpus_in_cluster_ptr);
75 local_irq_restore(flags);
78 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
80 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
84 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
86 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
89 static void x2apic_send_IPI_allbutself(int vector)
91 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
94 static void x2apic_send_IPI_all(int vector)
96 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
100 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
101 const struct cpumask *andmask,
102 unsigned int *apicid)
108 for_each_cpu_and(i, cpumask, andmask) {
109 if (!cpumask_test_cpu(i, cpu_online_mask))
111 dest = per_cpu(x86_cpu_to_logical_apicid, i);
112 cluster = x2apic_cluster(i);
119 for_each_cpu_and(i, cpumask, andmask) {
120 if (!cpumask_test_cpu(i, cpu_online_mask))
122 if (cluster != x2apic_cluster(i))
124 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
132 static void init_x2apic_ldr(void)
134 unsigned int this_cpu = smp_processor_id();
137 per_cpu(x86_cpu_to_logical_apicid, this_cpu) = apic_read(APIC_LDR);
139 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, this_cpu));
140 for_each_online_cpu(cpu) {
141 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
143 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, cpu));
144 __cpu_set(cpu, per_cpu(cpus_in_cluster, this_cpu));
149 * At CPU state changes, update the x2apic cluster sibling info.
152 update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
154 unsigned int this_cpu = (unsigned long)hcpu;
160 if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
163 } else if (!zalloc_cpumask_var(&per_cpu(ipi_mask, this_cpu),
165 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
169 case CPU_UP_CANCELED:
170 case CPU_UP_CANCELED_FROZEN:
172 for_each_online_cpu(cpu) {
173 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
175 __cpu_clear(this_cpu, per_cpu(cpus_in_cluster, cpu));
176 __cpu_clear(cpu, per_cpu(cpus_in_cluster, this_cpu));
178 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
179 free_cpumask_var(per_cpu(ipi_mask, this_cpu));
183 return notifier_from_errno(err);
186 static struct notifier_block __refdata x2apic_cpu_notifier = {
187 .notifier_call = update_clusterinfo,
190 static int x2apic_init_cpu_notifier(void)
192 int cpu = smp_processor_id();
194 zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
195 zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
197 BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
199 __cpu_set(cpu, per_cpu(cpus_in_cluster, cpu));
200 register_hotcpu_notifier(&x2apic_cpu_notifier);
204 static int x2apic_cluster_probe(void)
207 return x2apic_init_cpu_notifier();
213 * Each x2apic cluster is an allocation domain.
215 static bool cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
217 cpumask_clear(retmask);
218 cpumask_copy(retmask, per_cpu(cpus_in_cluster, cpu));
222 static struct apic apic_x2apic_cluster = {
224 .name = "cluster x2apic",
225 .probe = x2apic_cluster_probe,
226 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
227 .apic_id_valid = x2apic_apic_id_valid,
228 .apic_id_registered = x2apic_apic_id_registered,
230 .irq_delivery_mode = dest_LowestPrio,
231 .irq_dest_mode = 1, /* logical */
233 .target_cpus = online_target_cpus,
235 .dest_logical = APIC_DEST_LOGICAL,
236 .check_apicid_used = NULL,
237 .check_apicid_present = NULL,
239 .vector_allocation_domain = cluster_vector_allocation_domain,
240 .init_apic_ldr = init_x2apic_ldr,
242 .ioapic_phys_id_map = NULL,
243 .setup_apic_routing = NULL,
244 .multi_timer_check = NULL,
245 .cpu_present_to_apicid = default_cpu_present_to_apicid,
246 .apicid_to_cpu_present = NULL,
247 .setup_portio_remap = NULL,
248 .check_phys_apicid_present = default_check_phys_apicid_present,
249 .enable_apic_mode = NULL,
250 .phys_pkg_id = x2apic_phys_pkg_id,
251 .mps_oem_check = NULL,
253 .get_apic_id = x2apic_get_apic_id,
254 .set_apic_id = x2apic_set_apic_id,
255 .apic_id_mask = 0xFFFFFFFFu,
257 .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
259 .send_IPI_mask = x2apic_send_IPI_mask,
260 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
261 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
262 .send_IPI_all = x2apic_send_IPI_all,
263 .send_IPI_self = x2apic_send_IPI_self,
265 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
266 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
267 .wait_for_init_deassert = NULL,
268 .smp_callin_clear_local_apic = NULL,
269 .inquire_remote_apic = NULL,
271 .read = native_apic_msr_read,
272 .write = native_apic_msr_write,
273 .eoi_write = native_apic_msr_eoi_write,
274 .icr_read = native_x2apic_icr_read,
275 .icr_write = native_x2apic_icr_write,
276 .wait_icr_idle = native_x2apic_wait_icr_idle,
277 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
280 apic_driver(apic_x2apic_cluster);