mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / arch / x86 / xen / smp.c
blob77c959cf81e7c3fb573066513067c47f2698fedc
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>
8 #include <xen/events.h>
10 #include <xen/hvc-console.h>
11 #include "xen-ops.h"
12 #include "smp.h"
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 };
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);
23 * Reschedule call back.
25 static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
27 inc_irq_stat(irq_resched_count);
28 scheduler_ipi();
30 return IRQ_HANDLED;
33 void xen_smp_intr_free(unsigned int cpu)
35 if (per_cpu(xen_resched_irq, cpu).irq >= 0) {
36 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu).irq, NULL);
37 per_cpu(xen_resched_irq, cpu).irq = -1;
38 kfree(per_cpu(xen_resched_irq, cpu).name);
39 per_cpu(xen_resched_irq, cpu).name = NULL;
41 if (per_cpu(xen_callfunc_irq, cpu).irq >= 0) {
42 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu).irq, NULL);
43 per_cpu(xen_callfunc_irq, cpu).irq = -1;
44 kfree(per_cpu(xen_callfunc_irq, cpu).name);
45 per_cpu(xen_callfunc_irq, cpu).name = NULL;
47 if (per_cpu(xen_debug_irq, cpu).irq >= 0) {
48 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu).irq, NULL);
49 per_cpu(xen_debug_irq, cpu).irq = -1;
50 kfree(per_cpu(xen_debug_irq, cpu).name);
51 per_cpu(xen_debug_irq, cpu).name = NULL;
53 if (per_cpu(xen_callfuncsingle_irq, cpu).irq >= 0) {
54 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu).irq,
55 NULL);
56 per_cpu(xen_callfuncsingle_irq, cpu).irq = -1;
57 kfree(per_cpu(xen_callfuncsingle_irq, cpu).name);
58 per_cpu(xen_callfuncsingle_irq, cpu).name = NULL;
62 int xen_smp_intr_init(unsigned int cpu)
64 int rc;
65 char *resched_name, *callfunc_name, *debug_name;
67 resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
68 rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
69 cpu,
70 xen_reschedule_interrupt,
71 IRQF_PERCPU|IRQF_NOBALANCING,
72 resched_name,
73 NULL);
74 if (rc < 0)
75 goto fail;
76 per_cpu(xen_resched_irq, cpu).irq = rc;
77 per_cpu(xen_resched_irq, cpu).name = resched_name;
79 callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
80 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
81 cpu,
82 xen_call_function_interrupt,
83 IRQF_PERCPU|IRQF_NOBALANCING,
84 callfunc_name,
85 NULL);
86 if (rc < 0)
87 goto fail;
88 per_cpu(xen_callfunc_irq, cpu).irq = rc;
89 per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
91 debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
92 rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
93 IRQF_PERCPU | IRQF_NOBALANCING,
94 debug_name, NULL);
95 if (rc < 0)
96 goto fail;
97 per_cpu(xen_debug_irq, cpu).irq = rc;
98 per_cpu(xen_debug_irq, cpu).name = debug_name;
100 callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
101 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
102 cpu,
103 xen_call_function_single_interrupt,
104 IRQF_PERCPU|IRQF_NOBALANCING,
105 callfunc_name,
106 NULL);
107 if (rc < 0)
108 goto fail;
109 per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
110 per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
112 return 0;
114 fail:
115 xen_smp_intr_free(cpu);
116 return rc;
119 void __init xen_smp_cpus_done(unsigned int max_cpus)
121 int cpu, rc, count = 0;
123 if (xen_hvm_domain())
124 native_smp_cpus_done(max_cpus);
126 if (xen_have_vcpu_info_placement)
127 return;
129 for_each_online_cpu(cpu) {
130 if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
131 continue;
133 rc = cpu_down(cpu);
135 if (rc == 0) {
137 * Reset vcpu_info so this cpu cannot be onlined again.
139 xen_vcpu_info_reset(cpu);
140 count++;
141 } else {
142 pr_warn("%s: failed to bring CPU %d down, error %d\n",
143 __func__, cpu, rc);
146 WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
149 void xen_smp_send_reschedule(int cpu)
151 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
154 static void __xen_send_IPI_mask(const struct cpumask *mask,
155 int vector)
157 unsigned cpu;
159 for_each_cpu_and(cpu, mask, cpu_online_mask)
160 xen_send_IPI_one(cpu, vector);
163 void xen_smp_send_call_function_ipi(const struct cpumask *mask)
165 int cpu;
167 __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
169 /* Make sure other vcpus get a chance to run if they need to. */
170 for_each_cpu(cpu, mask) {
171 if (xen_vcpu_stolen(cpu)) {
172 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
173 break;
178 void xen_smp_send_call_function_single_ipi(int cpu)
180 __xen_send_IPI_mask(cpumask_of(cpu),
181 XEN_CALL_FUNCTION_SINGLE_VECTOR);
184 static inline int xen_map_vector(int vector)
186 int xen_vector;
188 switch (vector) {
189 case RESCHEDULE_VECTOR:
190 xen_vector = XEN_RESCHEDULE_VECTOR;
191 break;
192 case CALL_FUNCTION_VECTOR:
193 xen_vector = XEN_CALL_FUNCTION_VECTOR;
194 break;
195 case CALL_FUNCTION_SINGLE_VECTOR:
196 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
197 break;
198 case IRQ_WORK_VECTOR:
199 xen_vector = XEN_IRQ_WORK_VECTOR;
200 break;
201 #ifdef CONFIG_X86_64
202 case NMI_VECTOR:
203 case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
204 xen_vector = XEN_NMI_VECTOR;
205 break;
206 #endif
207 default:
208 xen_vector = -1;
209 printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
210 vector);
213 return xen_vector;
216 void xen_send_IPI_mask(const struct cpumask *mask,
217 int vector)
219 int xen_vector = xen_map_vector(vector);
221 if (xen_vector >= 0)
222 __xen_send_IPI_mask(mask, xen_vector);
225 void xen_send_IPI_all(int vector)
227 int xen_vector = xen_map_vector(vector);
229 if (xen_vector >= 0)
230 __xen_send_IPI_mask(cpu_online_mask, xen_vector);
233 void xen_send_IPI_self(int vector)
235 int xen_vector = xen_map_vector(vector);
237 if (xen_vector >= 0)
238 xen_send_IPI_one(smp_processor_id(), xen_vector);
241 void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
242 int vector)
244 unsigned cpu;
245 unsigned int this_cpu = smp_processor_id();
246 int xen_vector = xen_map_vector(vector);
248 if (!(num_online_cpus() > 1) || (xen_vector < 0))
249 return;
251 for_each_cpu_and(cpu, mask, cpu_online_mask) {
252 if (this_cpu == cpu)
253 continue;
255 xen_send_IPI_one(cpu, xen_vector);
259 void xen_send_IPI_allbutself(int vector)
261 xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
264 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
266 irq_enter();
267 generic_smp_call_function_interrupt();
268 inc_irq_stat(irq_call_count);
269 irq_exit();
271 return IRQ_HANDLED;
274 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
276 irq_enter();
277 generic_smp_call_function_single_interrupt();
278 inc_irq_stat(irq_call_count);
279 irq_exit();
281 return IRQ_HANDLED;