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