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>
7#include <linux/cpu.h>
8
9#include <asm/smp.h>
10#include <asm/x2apic.h>
11
12static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
13static DEFINE_PER_CPU(cpumask_var_t, cpus_in_cluster);
14static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
15
16static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
17{
18 return x2apic_enabled();
19}
20
21static inline u32 x2apic_cluster(int cpu)
22{
23 return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
24}
25
26static void
27__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
28{
29 struct cpumask *cpus_in_cluster_ptr;
30 struct cpumask *ipi_mask_ptr;
31 unsigned int cpu, this_cpu;
32 unsigned long flags;
33 u32 dest;
34
35 x2apic_wrmsr_fence();
36
37 local_irq_save(flags);
38
39 this_cpu = smp_processor_id();
40
41
42
43
44
45 ipi_mask_ptr = this_cpu_cpumask_var_ptr(ipi_mask);
46 cpumask_copy(ipi_mask_ptr, mask);
47
48
49
50
51 for_each_cpu(cpu, ipi_mask_ptr) {
52 unsigned long i;
53
54 cpus_in_cluster_ptr = per_cpu(cpus_in_cluster, cpu);
55 dest = 0;
56
57
58 for_each_cpu_and(i, ipi_mask_ptr, cpus_in_cluster_ptr) {
59 if (apic_dest == APIC_DEST_ALLINC || i != this_cpu)
60 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
61 }
62
63 if (!dest)
64 continue;
65
66 __x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
67
68
69
70
71 cpumask_andnot(ipi_mask_ptr, ipi_mask_ptr, cpus_in_cluster_ptr);
72 }
73
74 local_irq_restore(flags);
75}
76
77static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
78{
79 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
80}
81
82static void
83x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
84{
85 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
86}
87
88static void x2apic_send_IPI_allbutself(int vector)
89{
90 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
91}
92
93static void x2apic_send_IPI_all(int vector)
94{
95 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
96}
97
98static int
99x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
100 const struct cpumask *andmask,
101 unsigned int *apicid)
102{
103 u32 dest = 0;
104 u16 cluster;
105 int i;
106
107 for_each_cpu_and(i, cpumask, andmask) {
108 if (!cpumask_test_cpu(i, cpu_online_mask))
109 continue;
110 dest = per_cpu(x86_cpu_to_logical_apicid, i);
111 cluster = x2apic_cluster(i);
112 break;
113 }
114
115 if (!dest)
116 return -EINVAL;
117
118 for_each_cpu_and(i, cpumask, andmask) {
119 if (!cpumask_test_cpu(i, cpu_online_mask))
120 continue;
121 if (cluster != x2apic_cluster(i))
122 continue;
123 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
124 }
125
126 *apicid = dest;
127
128 return 0;
129}
130
131static void init_x2apic_ldr(void)
132{
133 unsigned int this_cpu = smp_processor_id();
134 unsigned int cpu;
135
136 per_cpu(x86_cpu_to_logical_apicid, this_cpu) = apic_read(APIC_LDR);
137
138 cpumask_set_cpu(this_cpu, per_cpu(cpus_in_cluster, this_cpu));
139 for_each_online_cpu(cpu) {
140 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
141 continue;
142 cpumask_set_cpu(this_cpu, per_cpu(cpus_in_cluster, cpu));
143 cpumask_set_cpu(cpu, per_cpu(cpus_in_cluster, this_cpu));
144 }
145}
146
147
148
149
150static int
151update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
152{
153 unsigned int this_cpu = (unsigned long)hcpu;
154 unsigned int cpu;
155 int err = 0;
156
157 switch (action) {
158 case CPU_UP_PREPARE:
159 if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
160 GFP_KERNEL)) {
161 err = -ENOMEM;
162 } else if (!zalloc_cpumask_var(&per_cpu(ipi_mask, this_cpu),
163 GFP_KERNEL)) {
164 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
165 err = -ENOMEM;
166 }
167 break;
168 case CPU_UP_CANCELED:
169 case CPU_UP_CANCELED_FROZEN:
170 case CPU_DEAD:
171 for_each_online_cpu(cpu) {
172 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
173 continue;
174 cpumask_clear_cpu(this_cpu, per_cpu(cpus_in_cluster, cpu));
175 cpumask_clear_cpu(cpu, per_cpu(cpus_in_cluster, this_cpu));
176 }
177 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
178 free_cpumask_var(per_cpu(ipi_mask, this_cpu));
179 break;
180 }
181
182 return notifier_from_errno(err);
183}
184
185static struct notifier_block x2apic_cpu_notifier = {
186 .notifier_call = update_clusterinfo,
187};
188
189static int x2apic_init_cpu_notifier(void)
190{
191 int cpu = smp_processor_id();
192
193 zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
194 zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
195
196 BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
197
198 cpumask_set_cpu(cpu, per_cpu(cpus_in_cluster, cpu));
199 register_hotcpu_notifier(&x2apic_cpu_notifier);
200 return 1;
201}
202
203static int x2apic_cluster_probe(void)
204{
205 if (x2apic_mode)
206 return x2apic_init_cpu_notifier();
207 else
208 return 0;
209}
210
211static const struct cpumask *x2apic_cluster_target_cpus(void)
212{
213 return cpu_all_mask;
214}
215
216
217
218
219static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask,
220 const struct cpumask *mask)
221{
222
223
224
225
226
227
228
229
230
231 if (mask == x2apic_cluster_target_cpus())
232 cpumask_copy(retmask, cpumask_of(cpu));
233 else
234 cpumask_and(retmask, mask, per_cpu(cpus_in_cluster, cpu));
235}
236
237static struct apic apic_x2apic_cluster = {
238
239 .name = "cluster x2apic",
240 .probe = x2apic_cluster_probe,
241 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
242 .apic_id_valid = x2apic_apic_id_valid,
243 .apic_id_registered = x2apic_apic_id_registered,
244
245 .irq_delivery_mode = dest_LowestPrio,
246 .irq_dest_mode = 1,
247
248 .target_cpus = x2apic_cluster_target_cpus,
249 .disable_esr = 0,
250 .dest_logical = APIC_DEST_LOGICAL,
251 .check_apicid_used = NULL,
252
253 .vector_allocation_domain = cluster_vector_allocation_domain,
254 .init_apic_ldr = init_x2apic_ldr,
255
256 .ioapic_phys_id_map = NULL,
257 .setup_apic_routing = NULL,
258 .cpu_present_to_apicid = default_cpu_present_to_apicid,
259 .apicid_to_cpu_present = NULL,
260 .check_phys_apicid_present = default_check_phys_apicid_present,
261 .phys_pkg_id = x2apic_phys_pkg_id,
262
263 .get_apic_id = x2apic_get_apic_id,
264 .set_apic_id = x2apic_set_apic_id,
265 .apic_id_mask = 0xFFFFFFFFu,
266
267 .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
268
269 .send_IPI_mask = x2apic_send_IPI_mask,
270 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
271 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
272 .send_IPI_all = x2apic_send_IPI_all,
273 .send_IPI_self = x2apic_send_IPI_self,
274
275 .inquire_remote_apic = NULL,
276
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,
284};
285
286apic_driver(apic_x2apic_cluster);
287
