1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/smp.h>
3 #include <linux/cpu.h>
4 #include <linux/slab.h>
5 #include <linux/cpumask.h>
6 #include <linux/percpu.h>
7
8 #include <xen/events.h>
9
10 #include <xen/hvc-console.h>
11 #include "xen-ops.h"
12 #include "smp.h"
13
14 static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
15 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
16 static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
17 static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
18
19 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
20 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
21
22 /*
23 * Reschedule call back.
24 */
xen_reschedule_interrupt(int irq,void * dev_id)25 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
26 {
27 inc_irq_stat(irq_resched_count);
28 scheduler_ipi();
29
30 return IRQ_HANDLED;
31 }
32
xen_smp_intr_free(unsigned int cpu)33 void xen_smp_intr_free(unsigned int cpu)
34 {
35 kfree(per_cpu(xen_resched_irq, cpu).name);
36 per_cpu(xen_resched_irq, cpu).name = NULL;
37 if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
38 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
39 per_cpu(xen_resched_irq, cpu).irq = -1;
40 }
41 kfree(per_cpu(xen_callfunc_irq, cpu).name);
42 per_cpu(xen_callfunc_irq, cpu).name = NULL;
43 if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
44 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
45 per_cpu(xen_callfunc_irq, cpu).irq = -1;
46 }
47 kfree(per_cpu(xen_debug_irq, cpu).name);
48 per_cpu(xen_debug_irq, cpu).name = NULL;
49 if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
50 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
51 per_cpu(xen_debug_irq, cpu).irq = -1;
52 }
53 kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
54 per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
55 if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
56 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
57 NULL);
58 per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
59 }
60 }
61
xen_smp_intr_init(unsigned int cpu)62 int xen_smp_intr_init(unsigned int cpu)
63 {
64 int rc;
65 char *resched_name, *callfunc_name, *debug_name;
66
67 resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
68 if (!resched_name)
69 goto fail_mem;
70 per_cpu(xen_resched_irq, cpu).name = resched_name;
71 rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
72 cpu,
73 xen_reschedule_interrupt,
74 IRQF_PERCPU|IRQF_NOBALANCING,
75 resched_name,
76 NULL);
77 if (rc < 0)
78 goto fail;
79 per_cpu(xen_resched_irq, cpu).irq = rc;
80
81 callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
82 if (!callfunc_name)
83 goto fail_mem;
84 per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
85 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
86 cpu,
87 xen_call_function_interrupt,
88 IRQF_PERCPU|IRQF_NOBALANCING,
89 callfunc_name,
90 NULL);
91 if (rc < 0)
92 goto fail;
93 per_cpu(xen_callfunc_irq, cpu).irq = rc;
94
95 if (!xen_fifo_events) {
96 debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
97 if (!debug_name)
98 goto fail_mem;
99
100 per_cpu(xen_debug_irq, cpu).name = debug_name;
101 rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu,
102 xen_debug_interrupt,
103 IRQF_PERCPU | IRQF_NOBALANCING,
104 debug_name, NULL);
105 if (rc < 0)
106 goto fail;
107 per_cpu(xen_debug_irq, cpu).irq = rc;
108 }
109
110 callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
111 if (!callfunc_name)
112 goto fail_mem;
113
114 per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
115 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
116 cpu,
117 xen_call_function_single_interrupt,
118 IRQF_PERCPU|IRQF_NOBALANCING,
119 callfunc_name,
120 NULL);
121 if (rc < 0)
122 goto fail;
123 per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
124
125 return 0;
126
127 fail_mem:
128 rc = -ENOMEM;
129 fail:
130 xen_smp_intr_free(cpu);
131 return rc;
132 }
133
xen_smp_cpus_done(unsigned int max_cpus)134 void __init xen_smp_cpus_done(unsigned int max_cpus)
135 {
136 if (xen_hvm_domain())
137 native_smp_cpus_done(max_cpus);
138 else
139 calculate_max_logical_packages();
140 }
141
xen_smp_send_reschedule(int cpu)142 void xen_smp_send_reschedule(int cpu)
143 {
144 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
145 }
146
__xen_send_IPI_mask(const struct cpumask * mask,int vector)147 static void __xen_send_IPI_mask(const struct cpumask *mask,
148 int vector)
149 {
150 unsigned cpu;
151
152 for_each_cpu_and(cpu, mask, cpu_online_mask)
153 xen_send_IPI_one(cpu, vector);
154 }
155
xen_smp_send_call_function_ipi(const struct cpumask * mask)156 void xen_smp_send_call_function_ipi(const struct cpumask *mask)
157 {
158 int cpu;
159
160 __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
161
162 /* Make sure other vcpus get a chance to run if they need to. */
163 for_each_cpu(cpu, mask) {
164 if (xen_vcpu_stolen(cpu)) {
165 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
166 break;
167 }
168 }
169 }
170
xen_smp_send_call_function_single_ipi(int cpu)171 void xen_smp_send_call_function_single_ipi(int cpu)
172 {
173 __xen_send_IPI_mask(cpumask_of(cpu),
174 XEN_CALL_FUNCTION_SINGLE_VECTOR);
175 }
176
xen_map_vector(int vector)177 static inline int xen_map_vector(int vector)
178 {
179 int xen_vector;
180
181 switch (vector) {
182 case RESCHEDULE_VECTOR:
183 xen_vector = XEN_RESCHEDULE_VECTOR;
184 break;
185 case CALL_FUNCTION_VECTOR:
186 xen_vector = XEN_CALL_FUNCTION_VECTOR;
187 break;
188 case CALL_FUNCTION_SINGLE_VECTOR:
189 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
190 break;
191 case IRQ_WORK_VECTOR:
192 xen_vector = XEN_IRQ_WORK_VECTOR;
193 break;
194 #ifdef CONFIG_X86_64
195 case NMI_VECTOR:
196 case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
197 xen_vector = XEN_NMI_VECTOR;
198 break;
199 #endif
200 default:
201 xen_vector = -1;
202 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
203 vector);
204 }
205
206 return xen_vector;
207 }
208
xen_send_IPI_mask(const struct cpumask * mask,int vector)209 void xen_send_IPI_mask(const struct cpumask *mask,
210 int vector)
211 {
212 int xen_vector = xen_map_vector(vector);
213
214 if (xen_vector >= 0)
215 __xen_send_IPI_mask(mask, xen_vector);
216 }
217
xen_send_IPI_all(int vector)218 void xen_send_IPI_all(int vector)
219 {
220 int xen_vector = xen_map_vector(vector);
221
222 if (xen_vector >= 0)
223 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
224 }
225
xen_send_IPI_self(int vector)226 void xen_send_IPI_self(int vector)
227 {
228 int xen_vector = xen_map_vector(vector);
229
230 if (xen_vector >= 0)
231 xen_send_IPI_one(smp_processor_id(), xen_vector);
232 }
233
xen_send_IPI_mask_allbutself(const struct cpumask * mask,int vector)234 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
235 int vector)
236 {
237 unsigned cpu;
238 unsigned int this_cpu = smp_processor_id();
239 int xen_vector = xen_map_vector(vector);
240
241 if (!(num_online_cpus() > 1) || (xen_vector < 0))
242 return;
243
244 for_each_cpu_and(cpu, mask, cpu_online_mask) {
245 if (this_cpu == cpu)
246 continue;
247
248 xen_send_IPI_one(cpu, xen_vector);
249 }
250 }
251
xen_send_IPI_allbutself(int vector)252 void xen_send_IPI_allbutself(int vector)
253 {
254 xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
255 }
256
xen_call_function_interrupt(int irq,void * dev_id)257 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
258 {
259 generic_smp_call_function_interrupt();
260 inc_irq_stat(irq_call_count);
261
262 return IRQ_HANDLED;
263 }
264
xen_call_function_single_interrupt(int irq,void * dev_id)265 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
266 {
267 generic_smp_call_function_single_interrupt();
268 inc_irq_stat(irq_call_count);
269
270 return IRQ_HANDLED;
271 }
272