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 */ 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 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 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 } 133 134 void __init xen_smp_cpus_done(unsigned int max_cpus) 135 { 136 if (xen_hvm_domain()) 137 native_smp_cpus_done(max_cpus); 138 } 139 140 void xen_smp_send_reschedule(int cpu) 141 { 142 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); 143 } 144 145 static void __xen_send_IPI_mask(const struct cpumask *mask, 146 int vector) 147 { 148 unsigned cpu; 149 150 for_each_cpu_and(cpu, mask, cpu_online_mask) 151 xen_send_IPI_one(cpu, vector); 152 } 153 154 void xen_smp_send_call_function_ipi(const struct cpumask *mask) 155 { 156 int cpu; 157 158 __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR); 159 160 /* Make sure other vcpus get a chance to run if they need to. */ 161 for_each_cpu(cpu, mask) { 162 if (xen_vcpu_stolen(cpu)) { 163 HYPERVISOR_sched_op(SCHEDOP_yield, NULL); 164 break; 165 } 166 } 167 } 168 169 void xen_smp_send_call_function_single_ipi(int cpu) 170 { 171 __xen_send_IPI_mask(cpumask_of(cpu), 172 XEN_CALL_FUNCTION_SINGLE_VECTOR); 173 } 174 175 static inline int xen_map_vector(int vector) 176 { 177 int xen_vector; 178 179 switch (vector) { 180 case RESCHEDULE_VECTOR: 181 xen_vector = XEN_RESCHEDULE_VECTOR; 182 break; 183 case CALL_FUNCTION_VECTOR: 184 xen_vector = XEN_CALL_FUNCTION_VECTOR; 185 break; 186 case CALL_FUNCTION_SINGLE_VECTOR: 187 xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR; 188 break; 189 case IRQ_WORK_VECTOR: 190 xen_vector = XEN_IRQ_WORK_VECTOR; 191 break; 192 #ifdef CONFIG_X86_64 193 case NMI_VECTOR: 194 case APIC_DM_NMI: /* Some use that instead of NMI_VECTOR */ 195 xen_vector = XEN_NMI_VECTOR; 196 break; 197 #endif 198 default: 199 xen_vector = -1; 200 printk(KERN_ERR "xen: vector 0x%x is not implemented\n", 201 vector); 202 } 203 204 return xen_vector; 205 } 206 207 void xen_send_IPI_mask(const struct cpumask *mask, 208 int vector) 209 { 210 int xen_vector = xen_map_vector(vector); 211 212 if (xen_vector >= 0) 213 __xen_send_IPI_mask(mask, xen_vector); 214 } 215 216 void xen_send_IPI_all(int vector) 217 { 218 int xen_vector = xen_map_vector(vector); 219 220 if (xen_vector >= 0) 221 __xen_send_IPI_mask(cpu_online_mask, xen_vector); 222 } 223 224 void xen_send_IPI_self(int vector) 225 { 226 int xen_vector = xen_map_vector(vector); 227 228 if (xen_vector >= 0) 229 xen_send_IPI_one(smp_processor_id(), xen_vector); 230 } 231 232 void xen_send_IPI_mask_allbutself(const struct cpumask *mask, 233 int vector) 234 { 235 unsigned cpu; 236 unsigned int this_cpu = smp_processor_id(); 237 int xen_vector = xen_map_vector(vector); 238 239 if (!(num_online_cpus() > 1) || (xen_vector < 0)) 240 return; 241 242 for_each_cpu_and(cpu, mask, cpu_online_mask) { 243 if (this_cpu == cpu) 244 continue; 245 246 xen_send_IPI_one(cpu, xen_vector); 247 } 248 } 249 250 void xen_send_IPI_allbutself(int vector) 251 { 252 xen_send_IPI_mask_allbutself(cpu_online_mask, vector); 253 } 254 255 static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id) 256 { 257 generic_smp_call_function_interrupt(); 258 inc_irq_stat(irq_call_count); 259 260 return IRQ_HANDLED; 261 } 262 263 static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id) 264 { 265 generic_smp_call_function_single_interrupt(); 266 inc_irq_stat(irq_call_count); 267 268 return IRQ_HANDLED; 269 } 270