blob: e66766bf164191de15d7ea9bf7b62c6506b2d6f2 [file] [log] [blame]
Suresh Siddha12a67cf2008-07-10 11:16:54 -07001#include <linux/threads.h>
2#include <linux/cpumask.h>
3#include <linux/string.h>
4#include <linux/kernel.h>
5#include <linux/ctype.h>
Yinghai Lu1b9b89e2008-07-21 22:08:21 -07006#include <linux/dmar.h>
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -07007#include <linux/cpu.h>
Yinghai Lu1b9b89e2008-07-21 22:08:21 -07008
Suresh Siddha12a67cf2008-07-10 11:16:54 -07009#include <asm/smp.h>
Cyrill Gorcunov79deb8e2011-05-19 16:45:50 -070010#include <asm/x2apic.h>
Suresh Siddha12a67cf2008-07-10 11:16:54 -070011
Jaswinder Singh Rajput2de1f332009-04-11 12:55:26 +053012static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -070013static DEFINE_PER_CPU(cpumask_var_t, cpus_in_cluster);
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -070014static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
Suresh Siddha12a67cf2008-07-10 11:16:54 -070015
Marcin Slusarz2caa3712008-10-12 11:44:11 +020016static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
Yinghai Lu1b9b89e2008-07-21 22:08:21 -070017{
Suresh Siddhaef1f87a2009-02-21 14:23:21 -080018 return x2apic_enabled();
Yinghai Lu1b9b89e2008-07-21 22:08:21 -070019}
20
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -070021static inline u32 x2apic_cluster(int cpu)
22{
23 return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
24}
25
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070026static void
27__x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
Suresh Siddha12a67cf2008-07-10 11:16:54 -070028{
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -070029 struct cpumask *cpus_in_cluster_ptr;
30 struct cpumask *ipi_mask_ptr;
31 unsigned int cpu, this_cpu;
Ingo Molnardac5f412009-01-28 15:42:24 +010032 unsigned long flags;
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -070033 u32 dest;
Suresh Siddha12a67cf2008-07-10 11:16:54 -070034
Suresh Siddhace4e2402009-03-17 10:16:54 -080035 x2apic_wrmsr_fence();
36
Suresh Siddha12a67cf2008-07-10 11:16:54 -070037 local_irq_save(flags);
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070038
39 this_cpu = smp_processor_id();
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -070040
41 /*
42 * We are to modify mask, so we need an own copy
43 * and be sure it's manipulated with irq off.
44 */
45 ipi_mask_ptr = __raw_get_cpu_var(ipi_mask);
46 cpumask_copy(ipi_mask_ptr, mask);
47
48 /*
49 * The idea is to send one IPI per cluster.
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 /* Collect cpus in cluster. */
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)
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070064 continue;
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -070065
66 __x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
67 /*
68 * Cluster sibling cpus should be discared now so
69 * we would not send IPI them second time.
70 */
71 cpumask_andnot(ipi_mask_ptr, ipi_mask_ptr, cpus_in_cluster_ptr);
Ingo Molnardac5f412009-01-28 15:42:24 +010072 }
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070073
Mike Travise7986732008-12-16 17:33:52 -080074 local_irq_restore(flags);
75}
76
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070077static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
78{
79 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
80}
81
Ingo Molnardac5f412009-01-28 15:42:24 +010082static void
Alexander Gordeev49d0c7a2012-06-05 13:23:15 +020083x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
Mike Travise7986732008-12-16 17:33:52 -080084{
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070085 __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
Suresh Siddha12a67cf2008-07-10 11:16:54 -070086}
87
88static void x2apic_send_IPI_allbutself(int vector)
89{
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070090 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
Suresh Siddha12a67cf2008-07-10 11:16:54 -070091}
92
93static void x2apic_send_IPI_all(int vector)
94{
Suresh Siddhaa27d0b52011-05-19 16:45:47 -070095 __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
Suresh Siddha12a67cf2008-07-10 11:16:54 -070096}
97
Alexander Gordeevff164322012-06-07 15:15:59 +020098static int
Ingo Molnardebccb32009-01-28 15:20:18 +010099x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
Alexander Gordeevff164322012-06-07 15:15:59 +0200100 const struct cpumask *andmask,
101 unsigned int *apicid)
Mike Travis95d313c2008-12-16 17:33:54 -0800102{
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700103 u32 dest = 0;
104 u16 cluster;
105 int i;
Mike Travis95d313c2008-12-16 17:33:54 -0800106
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700107 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;
Ingo Molnardebccb32009-01-28 15:20:18 +0100113 }
114
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700115 if (!dest)
Alexander Gordeevff164322012-06-07 15:15:59 +0200116 return -EINVAL;
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700117
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
Alexander Gordeevff164322012-06-07 15:15:59 +0200126 *apicid = dest;
127
128 return 0;
Mike Travis95d313c2008-12-16 17:33:54 -0800129}
130
Suresh Siddha12a67cf2008-07-10 11:16:54 -0700131static void init_x2apic_ldr(void)
132{
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700133 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 __cpu_set(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 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, cpu));
143 __cpu_set(cpu, per_cpu(cpus_in_cluster, this_cpu));
144 }
145}
146
147 /*
148 * At CPU state changes, update the x2apic cluster sibling info.
149 */
Paul Gortmaker148f9bb2013-06-18 18:23:59 -0400150static int
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700151update_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;
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -0700162 } 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;
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700166 }
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 __cpu_clear(this_cpu, per_cpu(cpus_in_cluster, cpu));
175 __cpu_clear(cpu, per_cpu(cpus_in_cluster, this_cpu));
176 }
177 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -0700178 free_cpumask_var(per_cpu(ipi_mask, this_cpu));
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700179 break;
180 }
181
182 return notifier_from_errno(err);
183}
184
185static struct notifier_block __refdata x2apic_cpu_notifier = {
186 .notifier_call = update_clusterinfo,
187};
188
189static int x2apic_init_cpu_notifier(void)
190{
Suresh Siddha12a67cf2008-07-10 11:16:54 -0700191 int cpu = smp_processor_id();
192
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700193 zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -0700194 zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700195
Cyrill Gorcunov9d0fa6c2011-05-19 16:45:49 -0700196 BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700197
198 __cpu_set(cpu, per_cpu(cpus_in_cluster, cpu));
199 register_hotcpu_notifier(&x2apic_cpu_notifier);
200 return 1;
Suresh Siddha12a67cf2008-07-10 11:16:54 -0700201}
202
Suresh Siddha9ebd6802011-05-19 16:45:46 -0700203static int x2apic_cluster_probe(void)
204{
Cyrill Gorcunova39d1f32011-05-19 16:45:48 -0700205 if (x2apic_mode)
206 return x2apic_init_cpu_notifier();
207 else
208 return 0;
Suresh Siddha9ebd6802011-05-19 16:45:46 -0700209}
210
Suresh Siddhad8728182012-06-25 13:38:29 -0700211static const struct cpumask *x2apic_cluster_target_cpus(void)
212{
213 return cpu_all_mask;
214}
215
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700216/*
217 * Each x2apic cluster is an allocation domain.
218 */
Suresh Siddha1ac322d2012-06-25 13:38:28 -0700219static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask,
220 const struct cpumask *mask)
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700221{
Suresh Siddhad8728182012-06-25 13:38:29 -0700222 /*
223 * To minimize vector pressure, default case of boot, device bringup
224 * etc will use a single cpu for the interrupt destination.
225 *
226 * On explicit migration requests coming from irqbalance etc,
227 * interrupts will be routed to the x2apic cluster (cluster-id
228 * derived from the first cpu in the mask) members specified
229 * in the mask.
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));
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700235}
236
Suresh Siddha1a8880a2011-05-20 17:51:20 -0700237static struct apic apic_x2apic_cluster = {
Ingo Molnar504a3c32009-01-28 02:37:01 +0100238
239 .name = "cluster x2apic",
Suresh Siddha9ebd6802011-05-19 16:45:46 -0700240 .probe = x2apic_cluster_probe,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100241 .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
Steffen Persvoldb7157ac2012-03-16 20:25:35 +0100242 .apic_id_valid = x2apic_apic_id_valid,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100243 .apic_id_registered = x2apic_apic_id_registered,
244
Ingo Molnarf8987a12009-01-28 04:02:31 +0100245 .irq_delivery_mode = dest_LowestPrio,
Ingo Molnar0b06e732009-01-28 05:13:04 +0100246 .irq_dest_mode = 1, /* logical */
Ingo Molnar504a3c32009-01-28 02:37:01 +0100247
Suresh Siddhad8728182012-06-25 13:38:29 -0700248 .target_cpus = x2apic_cluster_target_cpus,
Ingo Molnar08125d32009-01-28 05:08:44 +0100249 .disable_esr = 0,
Ingo Molnarbdb1a9b2009-01-28 05:29:25 +0100250 .dest_logical = APIC_DEST_LOGICAL,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100251 .check_apicid_used = NULL,
252 .check_apicid_present = NULL,
253
Suresh Siddha0b8255e2012-05-21 16:58:02 -0700254 .vector_allocation_domain = cluster_vector_allocation_domain,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100255 .init_apic_ldr = init_x2apic_ldr,
256
257 .ioapic_phys_id_map = NULL,
258 .setup_apic_routing = NULL,
259 .multi_timer_check = NULL,
Ingo Molnara21769a42009-01-28 06:50:47 +0100260 .cpu_present_to_apicid = default_cpu_present_to_apicid,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100261 .apicid_to_cpu_present = NULL,
262 .setup_portio_remap = NULL,
Ingo Molnara27a6212009-01-28 12:43:18 +0100263 .check_phys_apicid_present = default_check_phys_apicid_present,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100264 .enable_apic_mode = NULL,
Cyrill Gorcunov79deb8e2011-05-19 16:45:50 -0700265 .phys_pkg_id = x2apic_phys_pkg_id,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100266 .mps_oem_check = NULL,
267
Cyrill Gorcunov79deb8e2011-05-19 16:45:50 -0700268 .get_apic_id = x2apic_get_apic_id,
269 .set_apic_id = x2apic_set_apic_id,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100270 .apic_id_mask = 0xFFFFFFFFu,
271
Ingo Molnar504a3c32009-01-28 02:37:01 +0100272 .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
273
274 .send_IPI_mask = x2apic_send_IPI_mask,
275 .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
276 .send_IPI_allbutself = x2apic_send_IPI_allbutself,
277 .send_IPI_all = x2apic_send_IPI_all,
278 .send_IPI_self = x2apic_send_IPI_self,
279
Ingo Molnarabfa5842009-01-28 16:15:16 +0100280 .trampoline_phys_low = DEFAULT_TRAMPOLINE_PHYS_LOW,
281 .trampoline_phys_high = DEFAULT_TRAMPOLINE_PHYS_HIGH,
David Rientjes465822c2014-02-04 23:55:01 -0800282 .wait_for_init_deassert = false,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100283 .smp_callin_clear_local_apic = NULL,
Ingo Molnar504a3c32009-01-28 02:37:01 +0100284 .inquire_remote_apic = NULL,
Yinghai Luc1eeb2d2009-02-16 23:02:14 -0800285
286 .read = native_apic_msr_read,
287 .write = native_apic_msr_write,
Michael S. Tsirkin0ab711a2012-05-16 19:03:58 +0300288 .eoi_write = native_apic_msr_eoi_write,
Yinghai Luc1eeb2d2009-02-16 23:02:14 -0800289 .icr_read = native_x2apic_icr_read,
290 .icr_write = native_x2apic_icr_write,
291 .wait_icr_idle = native_x2apic_wait_icr_idle,
292 .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle,
Suresh Siddha12a67cf2008-07-10 11:16:54 -0700293};
Suresh Siddha107e0e02011-05-20 17:51:17 -0700294
295apic_driver(apic_x2apic_cluster);