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/dmar.h>
10 #include <asm/x2apic.h>
12 static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
13 static DEFINE_PER_CPU(cpumask_var_t, cpus_in_cluster);
14 static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
16 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
18 return x2apic_enabled();
21 static inline u32 x2apic_cluster(int cpu)
23 return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
27 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
29 struct cpumask *cpus_in_cluster_ptr;
30 struct cpumask *ipi_mask_ptr;
31 unsigned int cpu, this_cpu;
37 local_irq_save(flags);
39 this_cpu = smp_processor_id();
42 * We are to modify mask, so we need an own copy
43 * and be sure it's manipulated with irq off.
45 ipi_mask_ptr = this_cpu_cpumask_var_ptr(ipi_mask);
48 * The idea is to send one IPI per cluster.
50 for_each_cpu(cpu, ipi_mask_ptr) {
53 cpus_in_cluster_ptr = per_cpu(cpus_in_cluster, cpu);
56 /* Collect cpus in cluster. */
57 for_each_cpu_and(i, ipi_mask_ptr, cpus_in_cluster_ptr) {
58 if (apic_dest == APIC_DEST_ALLINC || i != this_cpu)
59 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
65 __x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
67 * Cluster sibling cpus should be discared now so
68 * we would not send IPI them second time.
70 cpumask_andnot(ipi_mask_ptr, ipi_mask_ptr, cpus_in_cluster_ptr);
73 local_irq_restore(flags);
76 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
78 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
82 x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
84 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
87 static void x2apic_send_IPI_allbutself(int vector)
89 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
92 static void x2apic_send_IPI_all(int vector)
94 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
98 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
99 const struct cpumask *andmask,
100 unsigned int *apicid)
106 for_each_cpu_and(i, cpumask, andmask) {
107 if (!cpumask_test_cpu(i, cpu_online_mask))
109 dest = per_cpu(x86_cpu_to_logical_apicid, i);
110 cluster = x2apic_cluster(i);
117 for_each_cpu_and(i, cpumask, andmask) {
118 if (!cpumask_test_cpu(i, cpu_online_mask))
120 if (cluster != x2apic_cluster(i))
122 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
130 static void init_x2apic_ldr(void)
132 unsigned int this_cpu = smp_processor_id();
135 per_cpu(x86_cpu_to_logical_apicid, this_cpu) = apic_read(APIC_LDR);
137 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, this_cpu));
138 for_each_online_cpu(cpu) {
139 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
141 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, cpu));
142 __cpu_set(cpu, per_cpu(cpus_in_cluster, this_cpu));
147 * At CPU state changes, update the x2apic cluster sibling info.
150 update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
152 unsigned int this_cpu = (unsigned long)hcpu;
158 if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
161 } else if (!zalloc_cpumask_var(&per_cpu(ipi_mask, this_cpu),
163 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
167 case CPU_UP_CANCELED:
168 case CPU_UP_CANCELED_FROZEN:
170 for_each_online_cpu(cpu) {
171 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
173 __cpu_clear(this_cpu, per_cpu(cpus_in_cluster, cpu));
174 __cpu_clear(cpu, per_cpu(cpus_in_cluster, this_cpu));
176 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
177 free_cpumask_var(per_cpu(ipi_mask, this_cpu));
181 return notifier_from_errno(err);
184 static struct notifier_block __refdata x2apic_cpu_notifier = {
185 .notifier_call = update_clusterinfo,
188 static int x2apic_init_cpu_notifier(void)
190 int cpu = smp_processor_id();
192 zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
193 zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
195 BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
197 __cpu_set(cpu, per_cpu(cpus_in_cluster, cpu));
198 register_hotcpu_notifier(&x2apic_cpu_notifier);
202 static int x2apic_cluster_probe(void)
205 return x2apic_init_cpu_notifier();
210 static const struct cpumask *x2apic_cluster_target_cpus(void)
216 * Each x2apic cluster is an allocation domain.
218 static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask,
219 const struct cpumask *mask)
222 * To minimize vector pressure, default case of boot, device bringup
223 * etc will use a single cpu for the interrupt destination.
225 * On explicit migration requests coming from irqbalance etc,
226 * interrupts will be routed to the x2apic cluster (cluster-id
227 * derived from the first cpu in the mask) members specified
230 if (mask == x2apic_cluster_target_cpus())
231 cpumask_copy(retmask, cpumask_of(cpu));
233 cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu));
236 static struct apic apic_x2apic_cluster = {
238 .name = "cluster x2apic",
239 .probe = x2apic_cluster_probe,
240 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
241 .apic_id_valid = x2apic_apic_id_valid,
242 .apic_id_registered = x2apic_apic_id_registered,
244 .irq_delivery_mode = dest_LowestPrio,
245 .irq_dest_mode = 1, /* logical */
247 .target_cpus = x2apic_cluster_target_cpus,
249 .dest_logical = APIC_DEST_LOGICAL,
250 .check_apicid_used = NULL,
252 .vector_allocation_domain = cluster_vector_allocation_domain,
253 .init_apic_ldr = init_x2apic_ldr,
255 .ioapic_phys_id_map = NULL,
256 .setup_apic_routing = NULL,
257 .cpu_present_to_apicid = default_cpu_present_to_apicid,
258 .apicid_to_cpu_present = NULL,
259 .check_phys_apicid_present = default_check_phys_apicid_present,
260 .phys_pkg_id = x2apic_phys_pkg_id,
262 .get_apic_id = x2apic_get_apic_id,
263 .set_apic_id = x2apic_set_apic_id,
264 .apic_id_mask = 0xFFFFFFFFu,
266 .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
268 .send_IPI_mask = x2apic_send_IPI_mask,
269 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
270 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
271 .send_IPI_all = x2apic_send_IPI_all,
272 .send_IPI_self = x2apic_send_IPI_self,
274 .wait_for_init_deassert = false,
275 .inquire_remote_apic = NULL,
277 .read = native_apic_msr_read,
278 .write = native_apic_msr_write,
279 .eoi_write = native_apic_msr_eoi_write,
280 .icr_read = native_x2apic_icr_read,
281 .icr_write = native_x2apic_icr_write,
282 .wait_icr_idle = native_x2apic_wait_icr_idle,
283 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
286 apic_driver(apic_x2apic_cluster);