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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
12a67cf6 SS |
2 | #include <linux/threads.h> |
3 | #include <linux/cpumask.h> | |
4 | #include <linux/string.h> | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/ctype.h> | |
1b9b89e7 | 7 | #include <linux/dmar.h> |
c7d6c9dd | 8 | #include <linux/irq.h> |
9d0fa6c5 | 9 | #include <linux/cpu.h> |
1b9b89e7 | 10 | |
12a67cf6 | 11 | #include <asm/smp.h> |
981c2eac | 12 | #include "x2apic.h" |
12a67cf6 | 13 | |
023a6117 TG |
14 | struct cluster_mask { |
15 | unsigned int clusterid; | |
16 | int node; | |
17 | struct cpumask mask; | |
18 | }; | |
19 | ||
2de1f33e | 20 | static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid); |
9d0fa6c5 | 21 | static DEFINE_PER_CPU(cpumask_var_t, ipi_mask); |
023a6117 TG |
22 | static DEFINE_PER_CPU(struct cluster_mask *, cluster_masks); |
23 | static struct cluster_mask *cluster_hotplug_mask; | |
12a67cf6 | 24 | |
2caa3715 | 25 | static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id) |
1b9b89e7 | 26 | { |
ef1f87aa | 27 | return x2apic_enabled(); |
1b9b89e7 YL |
28 | } |
29 | ||
7b6ce46c LT |
30 | static void x2apic_send_IPI(int cpu, int vector) |
31 | { | |
32 | u32 dest = per_cpu(x86_cpu_to_logical_apicid, cpu); | |
33 | ||
34 | x2apic_wrmsr_fence(); | |
35 | __x2apic_send_IPI_dest(dest, vector, APIC_DEST_LOGICAL); | |
36 | } | |
37 | ||
a27d0b5e SS |
38 | static void |
39 | __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest) | |
12a67cf6 | 40 | { |
023a6117 TG |
41 | unsigned int cpu, clustercpu; |
42 | struct cpumask *tmpmsk; | |
dac5f412 | 43 | unsigned long flags; |
9d0fa6c5 | 44 | u32 dest; |
12a67cf6 | 45 | |
ce4e240c | 46 | x2apic_wrmsr_fence(); |
12a67cf6 | 47 | local_irq_save(flags); |
a27d0b5e | 48 | |
023a6117 TG |
49 | tmpmsk = this_cpu_cpumask_var_ptr(ipi_mask); |
50 | cpumask_copy(tmpmsk, mask); | |
51 | /* If IPI should not be sent to self, clear current CPU */ | |
52 | if (apic_dest != APIC_DEST_ALLINC) | |
53 | cpumask_clear_cpu(smp_processor_id(), tmpmsk); | |
9d0fa6c5 | 54 | |
023a6117 TG |
55 | /* Collapse cpus in a cluster so a single IPI per cluster is sent */ |
56 | for_each_cpu(cpu, tmpmsk) { | |
57 | struct cluster_mask *cmsk = per_cpu(cluster_masks, cpu); | |
9d0fa6c5 | 58 | |
9d0fa6c5 | 59 | dest = 0; |
023a6117 TG |
60 | for_each_cpu_and(clustercpu, tmpmsk, &cmsk->mask) |
61 | dest |= per_cpu(x86_cpu_to_logical_apicid, clustercpu); | |
9d0fa6c5 CG |
62 | |
63 | if (!dest) | |
a27d0b5e | 64 | continue; |
9d0fa6c5 CG |
65 | |
66 | __x2apic_send_IPI_dest(dest, vector, apic->dest_logical); | |
023a6117 TG |
67 | /* Remove cluster CPUs from tmpmask */ |
68 | cpumask_andnot(tmpmsk, tmpmsk, &cmsk->mask); | |
dac5f412 | 69 | } |
a27d0b5e | 70 | |
12a67cf6 SS |
71 | local_irq_restore(flags); |
72 | } | |
73 | ||
a27d0b5e SS |
74 | static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector) |
75 | { | |
76 | __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC); | |
77 | } | |
78 | ||
dac5f412 | 79 | static void |
49d0c7a0 | 80 | x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector) |
12a67cf6 | 81 | { |
a27d0b5e | 82 | __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT); |
e7986739 | 83 | } |
12a67cf6 | 84 | |
e7986739 MT |
85 | static void x2apic_send_IPI_allbutself(int vector) |
86 | { | |
a27d0b5e | 87 | __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT); |
12a67cf6 SS |
88 | } |
89 | ||
90 | static void x2apic_send_IPI_all(int vector) | |
91 | { | |
a27d0b5e | 92 | __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC); |
12a67cf6 SS |
93 | } |
94 | ||
9f9e3bb1 TG |
95 | static u32 x2apic_calc_apicid(unsigned int cpu) |
96 | { | |
97 | return per_cpu(x86_cpu_to_logical_apicid, cpu); | |
98 | } | |
99 | ||
12a67cf6 | 100 | static void init_x2apic_ldr(void) |
a39d1f3f | 101 | { |
023a6117 TG |
102 | struct cluster_mask *cmsk = this_cpu_read(cluster_masks); |
103 | u32 cluster, apicid = apic_read(APIC_LDR); | |
a39d1f3f CG |
104 | unsigned int cpu; |
105 | ||
023a6117 | 106 | this_cpu_write(x86_cpu_to_logical_apicid, apicid); |
a39d1f3f | 107 | |
023a6117 TG |
108 | if (cmsk) |
109 | goto update; | |
110 | ||
111 | cluster = apicid >> 16; | |
a39d1f3f | 112 | for_each_online_cpu(cpu) { |
023a6117 TG |
113 | cmsk = per_cpu(cluster_masks, cpu); |
114 | /* Matching cluster found. Link and update it. */ | |
115 | if (cmsk && cmsk->clusterid == cluster) | |
116 | goto update; | |
a39d1f3f | 117 | } |
023a6117 TG |
118 | cmsk = cluster_hotplug_mask; |
119 | cluster_hotplug_mask = NULL; | |
120 | update: | |
121 | this_cpu_write(cluster_masks, cmsk); | |
122 | cpumask_set_cpu(smp_processor_id(), &cmsk->mask); | |
a39d1f3f CG |
123 | } |
124 | ||
023a6117 | 125 | static int alloc_clustermask(unsigned int cpu, int node) |
a39d1f3f | 126 | { |
023a6117 TG |
127 | if (per_cpu(cluster_masks, cpu)) |
128 | return 0; | |
129 | /* | |
130 | * If a hotplug spare mask exists, check whether it's on the right | |
131 | * node. If not, free it and allocate a new one. | |
132 | */ | |
133 | if (cluster_hotplug_mask) { | |
134 | if (cluster_hotplug_mask->node == node) | |
135 | return 0; | |
136 | kfree(cluster_hotplug_mask); | |
137 | } | |
6b2c2847 | 138 | |
023a6117 TG |
139 | cluster_hotplug_mask = kzalloc_node(sizeof(*cluster_hotplug_mask), |
140 | GFP_KERNEL, node); | |
141 | if (!cluster_hotplug_mask) | |
6b2c2847 | 142 | return -ENOMEM; |
023a6117 TG |
143 | cluster_hotplug_mask->node = node; |
144 | return 0; | |
145 | } | |
a39d1f3f | 146 | |
023a6117 TG |
147 | static int x2apic_prepare_cpu(unsigned int cpu) |
148 | { | |
149 | if (alloc_clustermask(cpu, cpu_to_node(cpu)) < 0) | |
150 | return -ENOMEM; | |
151 | if (!zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL)) | |
152 | return -ENOMEM; | |
6b2c2847 | 153 | return 0; |
a39d1f3f CG |
154 | } |
155 | ||
023a6117 | 156 | static int x2apic_dead_cpu(unsigned int dead_cpu) |
12a67cf6 | 157 | { |
023a6117 | 158 | struct cluster_mask *cmsk = per_cpu(cluster_masks, dead_cpu); |
a39d1f3f | 159 | |
1e66e2b8 | 160 | cpumask_clear_cpu(dead_cpu, &cmsk->mask); |
023a6117 | 161 | free_cpumask_var(per_cpu(ipi_mask, dead_cpu)); |
6b2c2847 | 162 | return 0; |
12a67cf6 SS |
163 | } |
164 | ||
9ebd680b SS |
165 | static int x2apic_cluster_probe(void) |
166 | { | |
6b2c2847 | 167 | if (!x2apic_mode) |
a39d1f3f | 168 | return 0; |
6b2c2847 | 169 | |
023a6117 TG |
170 | if (cpuhp_setup_state(CPUHP_X2APIC_PREPARE, "x86/x2apic:prepare", |
171 | x2apic_prepare_cpu, x2apic_dead_cpu) < 0) { | |
d52c0569 SAS |
172 | pr_err("Failed to register X2APIC_PREPARE\n"); |
173 | return 0; | |
174 | } | |
023a6117 | 175 | init_x2apic_ldr(); |
6b2c2847 | 176 | return 1; |
9ebd680b SS |
177 | } |
178 | ||
404f6aac | 179 | static struct apic apic_x2apic_cluster __ro_after_init = { |
504a3c3a IM |
180 | |
181 | .name = "cluster x2apic", | |
9ebd680b | 182 | .probe = x2apic_cluster_probe, |
504a3c3a | 183 | .acpi_madt_oem_check = x2apic_acpi_madt_oem_check, |
b7157acf | 184 | .apic_id_valid = x2apic_apic_id_valid, |
504a3c3a IM |
185 | .apic_id_registered = x2apic_apic_id_registered, |
186 | ||
a31e58e1 | 187 | .irq_delivery_mode = dest_Fixed, |
0b06e734 | 188 | .irq_dest_mode = 1, /* logical */ |
504a3c3a | 189 | |
08125d3e | 190 | .disable_esr = 0, |
bdb1a9b6 | 191 | .dest_logical = APIC_DEST_LOGICAL, |
504a3c3a | 192 | .check_apicid_used = NULL, |
504a3c3a | 193 | |
504a3c3a IM |
194 | .init_apic_ldr = init_x2apic_ldr, |
195 | ||
196 | .ioapic_phys_id_map = NULL, | |
197 | .setup_apic_routing = NULL, | |
a21769a4 | 198 | .cpu_present_to_apicid = default_cpu_present_to_apicid, |
504a3c3a | 199 | .apicid_to_cpu_present = NULL, |
a27a6210 | 200 | .check_phys_apicid_present = default_check_phys_apicid_present, |
79deb8e5 | 201 | .phys_pkg_id = x2apic_phys_pkg_id, |
504a3c3a | 202 | |
79deb8e5 CG |
203 | .get_apic_id = x2apic_get_apic_id, |
204 | .set_apic_id = x2apic_set_apic_id, | |
504a3c3a | 205 | |
9f9e3bb1 | 206 | .calc_dest_apicid = x2apic_calc_apicid, |
504a3c3a | 207 | |
7b6ce46c | 208 | .send_IPI = x2apic_send_IPI, |
504a3c3a IM |
209 | .send_IPI_mask = x2apic_send_IPI_mask, |
210 | .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself, | |
211 | .send_IPI_allbutself = x2apic_send_IPI_allbutself, | |
212 | .send_IPI_all = x2apic_send_IPI_all, | |
213 | .send_IPI_self = x2apic_send_IPI_self, | |
214 | ||
504a3c3a | 215 | .inquire_remote_apic = NULL, |
c1eeb2de YL |
216 | |
217 | .read = native_apic_msr_read, | |
218 | .write = native_apic_msr_write, | |
0ab711ae | 219 | .eoi_write = native_apic_msr_eoi_write, |
c1eeb2de YL |
220 | .icr_read = native_x2apic_icr_read, |
221 | .icr_write = native_x2apic_icr_write, | |
222 | .wait_icr_idle = native_x2apic_wait_icr_idle, | |
223 | .safe_wait_icr_idle = native_safe_x2apic_wait_icr_idle, | |
12a67cf6 | 224 | }; |
107e0e0c SS |
225 | |
226 | apic_driver(apic_x2apic_cluster); |