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 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 } 121 122 void __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 } 129 130 void xen_smp_send_reschedule(int cpu) 131 { 132 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); 133 } 134 135 static 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 } 143 144 void 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 } 158 159 void 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 } 164 165 static 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 } 196 197 void 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 } 205 206 void 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 } 213 214 void 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 } 221 222 void 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 } 239 240 void xen_send_IPI_allbutself(int vector) 241 { 242 xen_send_IPI_mask_allbutself(cpu_online_mask, vector); 243 } 244 245 static 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 } 252 253 static 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 } 260