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
 14static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
 15static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
 16static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
 17static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
 18
 19static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
 20static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
 21
 22/*
 23 * Reschedule call back.
 24 */
 25static 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
 33void 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
 62int 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	per_cpu(xen_resched_irq, cpu).name = resched_name;
 69	rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
 70				    cpu,
 71				    xen_reschedule_interrupt,
 72				    IRQF_PERCPU|IRQF_NOBALANCING,
 73				    resched_name,
 74				    NULL);
 75	if (rc < 0)
 76		goto fail;
 77	per_cpu(xen_resched_irq, cpu).irq = rc;
 
 78
 79	callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
 80	per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
 81	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
 82				    cpu,
 83				    xen_call_function_interrupt,
 84				    IRQF_PERCPU|IRQF_NOBALANCING,
 85				    callfunc_name,
 86				    NULL);
 87	if (rc < 0)
 88		goto fail;
 89	per_cpu(xen_callfunc_irq, cpu).irq = rc;
 
 90
 91	if (!xen_fifo_events) {
 92		debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
 93		per_cpu(xen_debug_irq, cpu).name = debug_name;
 94		rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu,
 95					     xen_debug_interrupt,
 96					     IRQF_PERCPU | IRQF_NOBALANCING,
 97					     debug_name, NULL);
 98		if (rc < 0)
 99			goto fail;
100		per_cpu(xen_debug_irq, cpu).irq = rc;
101	}
102
103	callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
104	per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
105	rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
106				    cpu,
107				    xen_call_function_single_interrupt,
108				    IRQF_PERCPU|IRQF_NOBALANCING,
109				    callfunc_name,
110				    NULL);
111	if (rc < 0)
112		goto fail;
113	per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
 
114
115	return 0;
116
117 fail:
118	xen_smp_intr_free(cpu);
119	return rc;
120}
121
122void __init xen_smp_cpus_done(unsigned int max_cpus)
123{
 
 
124	if (xen_hvm_domain())
125		native_smp_cpus_done(max_cpus);
126	else
127		calculate_max_logical_packages();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
128}
129
130void xen_smp_send_reschedule(int cpu)
131{
132	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
133}
134
135static void __xen_send_IPI_mask(const struct cpumask *mask,
136			      int vector)
137{
138	unsigned cpu;
139
140	for_each_cpu_and(cpu, mask, cpu_online_mask)
141		xen_send_IPI_one(cpu, vector);
142}
143
144void xen_smp_send_call_function_ipi(const struct cpumask *mask)
145{
146	int cpu;
147
148	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
149
150	/* Make sure other vcpus get a chance to run if they need to. */
151	for_each_cpu(cpu, mask) {
152		if (xen_vcpu_stolen(cpu)) {
153			HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
154			break;
155		}
156	}
157}
158
159void xen_smp_send_call_function_single_ipi(int cpu)
160{
161	__xen_send_IPI_mask(cpumask_of(cpu),
162			  XEN_CALL_FUNCTION_SINGLE_VECTOR);
163}
164
165static inline int xen_map_vector(int vector)
166{
167	int xen_vector;
168
169	switch (vector) {
170	case RESCHEDULE_VECTOR:
171		xen_vector = XEN_RESCHEDULE_VECTOR;
172		break;
173	case CALL_FUNCTION_VECTOR:
174		xen_vector = XEN_CALL_FUNCTION_VECTOR;
175		break;
176	case CALL_FUNCTION_SINGLE_VECTOR:
177		xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
178		break;
179	case IRQ_WORK_VECTOR:
180		xen_vector = XEN_IRQ_WORK_VECTOR;
181		break;
182#ifdef CONFIG_X86_64
183	case NMI_VECTOR:
184	case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
185		xen_vector = XEN_NMI_VECTOR;
186		break;
187#endif
188	default:
189		xen_vector = -1;
190		printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
191			vector);
192	}
193
194	return xen_vector;
195}
196
197void xen_send_IPI_mask(const struct cpumask *mask,
198			      int vector)
199{
200	int xen_vector = xen_map_vector(vector);
201
202	if (xen_vector >= 0)
203		__xen_send_IPI_mask(mask, xen_vector);
204}
205
206void xen_send_IPI_all(int vector)
207{
208	int xen_vector = xen_map_vector(vector);
209
210	if (xen_vector >= 0)
211		__xen_send_IPI_mask(cpu_online_mask, xen_vector);
212}
213
214void xen_send_IPI_self(int vector)
215{
216	int xen_vector = xen_map_vector(vector);
217
218	if (xen_vector >= 0)
219		xen_send_IPI_one(smp_processor_id(), xen_vector);
220}
221
222void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
223				int vector)
224{
225	unsigned cpu;
226	unsigned int this_cpu = smp_processor_id();
227	int xen_vector = xen_map_vector(vector);
228
229	if (!(num_online_cpus() > 1) || (xen_vector < 0))
230		return;
231
232	for_each_cpu_and(cpu, mask, cpu_online_mask) {
233		if (this_cpu == cpu)
234			continue;
235
236		xen_send_IPI_one(cpu, xen_vector);
237	}
238}
239
240void xen_send_IPI_allbutself(int vector)
241{
242	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
243}
244
245static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
246{
 
247	generic_smp_call_function_interrupt();
248	inc_irq_stat(irq_call_count);
 
249
250	return IRQ_HANDLED;
251}
252
253static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
254{
 
255	generic_smp_call_function_single_interrupt();
256	inc_irq_stat(irq_call_count);
 
257
258	return IRQ_HANDLED;
259}

  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
 14static DEFINE_PER_CPU(struct xen_common_irq, xen_resched_irq) = { .irq = -1 };
 15static DEFINE_PER_CPU(struct xen_common_irq, xen_callfunc_irq) = { .irq = -1 };
 16static DEFINE_PER_CPU(struct xen_common_irq, xen_callfuncsingle_irq) = { .irq = -1 };
 17static DEFINE_PER_CPU(struct xen_common_irq, xen_debug_irq) = { .irq = -1 };
 18
 19static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
 20static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
 21
 22/*
 23 * Reschedule call back.
 24 */
 25static 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
 33void xen_smp_intr_free(unsigned int cpu)
 34{
 
 
 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;
 40	}
 
 
 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;
 46	}
 
 
 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;
 52	}
 
 
 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;
 59	}
 60}
 61
 62int 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	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;
 78
 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;
 90
 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;
 
 
 
 99
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;
111
112	return 0;
113
114 fail:
115	xen_smp_intr_free(cpu);
116	return rc;
117}
118
119void __init xen_smp_cpus_done(unsigned int max_cpus)
120{
121	int cpu, rc, count = 0;
122
123	if (xen_hvm_domain())
124		native_smp_cpus_done(max_cpus);
125	else
126		calculate_max_logical_packages();
127
128	if (xen_have_vcpu_info_placement)
129		return;
130
131	for_each_online_cpu(cpu) {
132		if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
133			continue;
134
135		rc = remove_cpu(cpu);
136
137		if (rc == 0) {
138			/*
139			 * Reset vcpu_info so this cpu cannot be onlined again.
140			 */
141			xen_vcpu_info_reset(cpu);
142			count++;
143		} else {
144			pr_warn("%s: failed to bring CPU %d down, error %d\n",
145				__func__, cpu, rc);
146		}
147	}
148	WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
149}
150
151void xen_smp_send_reschedule(int cpu)
152{
153	xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
154}
155
156static void __xen_send_IPI_mask(const struct cpumask *mask,
157			      int vector)
158{
159	unsigned cpu;
160
161	for_each_cpu_and(cpu, mask, cpu_online_mask)
162		xen_send_IPI_one(cpu, vector);
163}
164
165void xen_smp_send_call_function_ipi(const struct cpumask *mask)
166{
167	int cpu;
168
169	__xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
170
171	/* Make sure other vcpus get a chance to run if they need to. */
172	for_each_cpu(cpu, mask) {
173		if (xen_vcpu_stolen(cpu)) {
174			HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
175			break;
176		}
177	}
178}
179
180void xen_smp_send_call_function_single_ipi(int cpu)
181{
182	__xen_send_IPI_mask(cpumask_of(cpu),
183			  XEN_CALL_FUNCTION_SINGLE_VECTOR);
184}
185
186static inline int xen_map_vector(int vector)
187{
188	int xen_vector;
189
190	switch (vector) {
191	case RESCHEDULE_VECTOR:
192		xen_vector = XEN_RESCHEDULE_VECTOR;
193		break;
194	case CALL_FUNCTION_VECTOR:
195		xen_vector = XEN_CALL_FUNCTION_VECTOR;
196		break;
197	case CALL_FUNCTION_SINGLE_VECTOR:
198		xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR;
199		break;
200	case IRQ_WORK_VECTOR:
201		xen_vector = XEN_IRQ_WORK_VECTOR;
202		break;
203#ifdef CONFIG_X86_64
204	case NMI_VECTOR:
205	case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */
206		xen_vector = XEN_NMI_VECTOR;
207		break;
208#endif
209	default:
210		xen_vector = -1;
211		printk(KERN_ERR "xen: vector 0x%x is not implemented\n",
212			vector);
213	}
214
215	return xen_vector;
216}
217
218void xen_send_IPI_mask(const struct cpumask *mask,
219			      int vector)
220{
221	int xen_vector = xen_map_vector(vector);
222
223	if (xen_vector >= 0)
224		__xen_send_IPI_mask(mask, xen_vector);
225}
226
227void xen_send_IPI_all(int vector)
228{
229	int xen_vector = xen_map_vector(vector);
230
231	if (xen_vector >= 0)
232		__xen_send_IPI_mask(cpu_online_mask, xen_vector);
233}
234
235void xen_send_IPI_self(int vector)
236{
237	int xen_vector = xen_map_vector(vector);
238
239	if (xen_vector >= 0)
240		xen_send_IPI_one(smp_processor_id(), xen_vector);
241}
242
243void xen_send_IPI_mask_allbutself(const struct cpumask *mask,
244				int vector)
245{
246	unsigned cpu;
247	unsigned int this_cpu = smp_processor_id();
248	int xen_vector = xen_map_vector(vector);
249
250	if (!(num_online_cpus() > 1) || (xen_vector < 0))
251		return;
252
253	for_each_cpu_and(cpu, mask, cpu_online_mask) {
254		if (this_cpu == cpu)
255			continue;
256
257		xen_send_IPI_one(cpu, xen_vector);
258	}
259}
260
261void xen_send_IPI_allbutself(int vector)
262{
263	xen_send_IPI_mask_allbutself(cpu_online_mask, vector);
264}
265
266static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
267{
268	irq_enter();
269	generic_smp_call_function_interrupt();
270	inc_irq_stat(irq_call_count);
271	irq_exit();
272
273	return IRQ_HANDLED;
274}
275
276static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
277{
278	irq_enter();
279	generic_smp_call_function_single_interrupt();
280	inc_irq_stat(irq_call_count);
281	irq_exit();
282
283	return IRQ_HANDLED;
284}