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 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 134void __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 142void xen_smp_send_reschedule(int cpu) 143{ 144 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); 145} 146 147static 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 156void 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 171void 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 177static 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 209void 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 218void 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 226void 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 234void 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 252void xen_send_IPI_allbutself(int vector) 253{ 254 xen_send_IPI_mask_allbutself(cpu_online_mask, vector); 255} 256 257static 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 265static 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