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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}
1/*
2 * Xen SMP support
3 *
4 * This file implements the Xen versions of smp_ops. SMP under Xen is
5 * very straightforward. Bringing a CPU up is simply a matter of
6 * loading its initial context and setting it running.
7 *
8 * IPIs are handled through the Xen event mechanism.
9 *
10 * Because virtual CPUs can be scheduled onto any real CPU, there's no
11 * useful topology information for the kernel to make use of. As a
12 * result, all CPUs are treated as if they're single-core and
13 * single-threaded.
14 */
15#include <linux/sched.h>
16#include <linux/err.h>
17#include <linux/slab.h>
18#include <linux/smp.h>
19
20#include <asm/paravirt.h>
21#include <asm/desc.h>
22#include <asm/pgtable.h>
23#include <asm/cpu.h>
24
25#include <xen/interface/xen.h>
26#include <xen/interface/vcpu.h>
27
28#include <asm/xen/interface.h>
29#include <asm/xen/hypercall.h>
30
31#include <xen/xen.h>
32#include <xen/page.h>
33#include <xen/events.h>
34
35#include <xen/hvc-console.h>
36#include "xen-ops.h"
37#include "mmu.h"
38
39cpumask_var_t xen_cpu_initialized_map;
40
41static DEFINE_PER_CPU(int, xen_resched_irq);
42static DEFINE_PER_CPU(int, xen_callfunc_irq);
43static DEFINE_PER_CPU(int, xen_callfuncsingle_irq);
44static DEFINE_PER_CPU(int, xen_debug_irq) = -1;
45
46static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id);
47static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id);
48
49/*
50 * Reschedule call back.
51 */
52static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id)
53{
54 inc_irq_stat(irq_resched_count);
55 scheduler_ipi();
56
57 return IRQ_HANDLED;
58}
59
60static void __cpuinit cpu_bringup(void)
61{
62 int cpu = smp_processor_id();
63
64 cpu_init();
65 touch_softlockup_watchdog();
66 preempt_disable();
67
68 xen_enable_sysenter();
69 xen_enable_syscall();
70
71 cpu = smp_processor_id();
72 smp_store_cpu_info(cpu);
73 cpu_data(cpu).x86_max_cores = 1;
74 set_cpu_sibling_map(cpu);
75
76 xen_setup_cpu_clockevents();
77
78 set_cpu_online(cpu, true);
79 percpu_write(cpu_state, CPU_ONLINE);
80 wmb();
81
82 /* We can take interrupts now: we're officially "up". */
83 local_irq_enable();
84
85 wmb(); /* make sure everything is out */
86}
87
88static void __cpuinit cpu_bringup_and_idle(void)
89{
90 cpu_bringup();
91 cpu_idle();
92}
93
94static int xen_smp_intr_init(unsigned int cpu)
95{
96 int rc;
97 const char *resched_name, *callfunc_name, *debug_name;
98
99 resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
100 rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
101 cpu,
102 xen_reschedule_interrupt,
103 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
104 resched_name,
105 NULL);
106 if (rc < 0)
107 goto fail;
108 per_cpu(xen_resched_irq, cpu) = rc;
109
110 callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
111 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
112 cpu,
113 xen_call_function_interrupt,
114 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
115 callfunc_name,
116 NULL);
117 if (rc < 0)
118 goto fail;
119 per_cpu(xen_callfunc_irq, cpu) = rc;
120
121 debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
122 rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
123 IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING,
124 debug_name, NULL);
125 if (rc < 0)
126 goto fail;
127 per_cpu(xen_debug_irq, cpu) = rc;
128
129 callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
130 rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
131 cpu,
132 xen_call_function_single_interrupt,
133 IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING,
134 callfunc_name,
135 NULL);
136 if (rc < 0)
137 goto fail;
138 per_cpu(xen_callfuncsingle_irq, cpu) = rc;
139
140 return 0;
141
142 fail:
143 if (per_cpu(xen_resched_irq, cpu) >= 0)
144 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
145 if (per_cpu(xen_callfunc_irq, cpu) >= 0)
146 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
147 if (per_cpu(xen_debug_irq, cpu) >= 0)
148 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
149 if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0)
150 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu),
151 NULL);
152
153 return rc;
154}
155
156static void __init xen_fill_possible_map(void)
157{
158 int i, rc;
159
160 if (xen_initial_domain())
161 return;
162
163 for (i = 0; i < nr_cpu_ids; i++) {
164 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
165 if (rc >= 0) {
166 num_processors++;
167 set_cpu_possible(i, true);
168 }
169 }
170}
171
172static void __init xen_filter_cpu_maps(void)
173{
174 int i, rc;
175
176 if (!xen_initial_domain())
177 return;
178
179 num_processors = 0;
180 disabled_cpus = 0;
181 for (i = 0; i < nr_cpu_ids; i++) {
182 rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
183 if (rc >= 0) {
184 num_processors++;
185 set_cpu_possible(i, true);
186 } else {
187 set_cpu_possible(i, false);
188 set_cpu_present(i, false);
189 }
190 }
191}
192
193static void __init xen_smp_prepare_boot_cpu(void)
194{
195 BUG_ON(smp_processor_id() != 0);
196 native_smp_prepare_boot_cpu();
197
198 /* We've switched to the "real" per-cpu gdt, so make sure the
199 old memory can be recycled */
200 make_lowmem_page_readwrite(xen_initial_gdt);
201
202 xen_filter_cpu_maps();
203 xen_setup_vcpu_info_placement();
204}
205
206static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
207{
208 unsigned cpu;
209 unsigned int i;
210
211 if (skip_ioapic_setup) {
212 char *m = (max_cpus == 0) ?
213 "The nosmp parameter is incompatible with Xen; " \
214 "use Xen dom0_max_vcpus=1 parameter" :
215 "The noapic parameter is incompatible with Xen";
216
217 xen_raw_printk(m);
218 panic(m);
219 }
220 xen_init_lock_cpu(0);
221
222 smp_store_cpu_info(0);
223 cpu_data(0).x86_max_cores = 1;
224
225 for_each_possible_cpu(i) {
226 zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
227 zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
228 zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
229 }
230 set_cpu_sibling_map(0);
231
232 if (xen_smp_intr_init(0))
233 BUG();
234
235 if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL))
236 panic("could not allocate xen_cpu_initialized_map\n");
237
238 cpumask_copy(xen_cpu_initialized_map, cpumask_of(0));
239
240 /* Restrict the possible_map according to max_cpus. */
241 while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) {
242 for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--)
243 continue;
244 set_cpu_possible(cpu, false);
245 }
246
247 for_each_possible_cpu (cpu) {
248 struct task_struct *idle;
249
250 if (cpu == 0)
251 continue;
252
253 idle = fork_idle(cpu);
254 if (IS_ERR(idle))
255 panic("failed fork for CPU %d", cpu);
256
257 set_cpu_present(cpu, true);
258 }
259}
260
261static int __cpuinit
262cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
263{
264 struct vcpu_guest_context *ctxt;
265 struct desc_struct *gdt;
266 unsigned long gdt_mfn;
267
268 if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map))
269 return 0;
270
271 ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
272 if (ctxt == NULL)
273 return -ENOMEM;
274
275 gdt = get_cpu_gdt_table(cpu);
276
277 ctxt->flags = VGCF_IN_KERNEL;
278 ctxt->user_regs.ds = __USER_DS;
279 ctxt->user_regs.es = __USER_DS;
280 ctxt->user_regs.ss = __KERNEL_DS;
281#ifdef CONFIG_X86_32
282 ctxt->user_regs.fs = __KERNEL_PERCPU;
283 ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
284#else
285 ctxt->gs_base_kernel = per_cpu_offset(cpu);
286#endif
287 ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
288 ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */
289
290 memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
291
292 xen_copy_trap_info(ctxt->trap_ctxt);
293
294 ctxt->ldt_ents = 0;
295
296 BUG_ON((unsigned long)gdt & ~PAGE_MASK);
297
298 gdt_mfn = arbitrary_virt_to_mfn(gdt);
299 make_lowmem_page_readonly(gdt);
300 make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
301
302 ctxt->gdt_frames[0] = gdt_mfn;
303 ctxt->gdt_ents = GDT_ENTRIES;
304
305 ctxt->user_regs.cs = __KERNEL_CS;
306 ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
307
308 ctxt->kernel_ss = __KERNEL_DS;
309 ctxt->kernel_sp = idle->thread.sp0;
310
311#ifdef CONFIG_X86_32
312 ctxt->event_callback_cs = __KERNEL_CS;
313 ctxt->failsafe_callback_cs = __KERNEL_CS;
314#endif
315 ctxt->event_callback_eip = (unsigned long)xen_hypervisor_callback;
316 ctxt->failsafe_callback_eip = (unsigned long)xen_failsafe_callback;
317
318 per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir);
319 ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
320
321 if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
322 BUG();
323
324 kfree(ctxt);
325 return 0;
326}
327
328static int __cpuinit xen_cpu_up(unsigned int cpu)
329{
330 struct task_struct *idle = idle_task(cpu);
331 int rc;
332
333 per_cpu(current_task, cpu) = idle;
334#ifdef CONFIG_X86_32
335 irq_ctx_init(cpu);
336#else
337 clear_tsk_thread_flag(idle, TIF_FORK);
338 per_cpu(kernel_stack, cpu) =
339 (unsigned long)task_stack_page(idle) -
340 KERNEL_STACK_OFFSET + THREAD_SIZE;
341#endif
342 xen_setup_runstate_info(cpu);
343 xen_setup_timer(cpu);
344 xen_init_lock_cpu(cpu);
345
346 per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
347
348 /* make sure interrupts start blocked */
349 per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1;
350
351 rc = cpu_initialize_context(cpu, idle);
352 if (rc)
353 return rc;
354
355 if (num_online_cpus() == 1)
356 alternatives_smp_switch(1);
357
358 rc = xen_smp_intr_init(cpu);
359 if (rc)
360 return rc;
361
362 rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL);
363 BUG_ON(rc);
364
365 while(per_cpu(cpu_state, cpu) != CPU_ONLINE) {
366 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
367 barrier();
368 }
369
370 return 0;
371}
372
373static void xen_smp_cpus_done(unsigned int max_cpus)
374{
375}
376
377#ifdef CONFIG_HOTPLUG_CPU
378static int xen_cpu_disable(void)
379{
380 unsigned int cpu = smp_processor_id();
381 if (cpu == 0)
382 return -EBUSY;
383
384 cpu_disable_common();
385
386 load_cr3(swapper_pg_dir);
387 return 0;
388}
389
390static void xen_cpu_die(unsigned int cpu)
391{
392 while (HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) {
393 current->state = TASK_UNINTERRUPTIBLE;
394 schedule_timeout(HZ/10);
395 }
396 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
397 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
398 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
399 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
400 xen_uninit_lock_cpu(cpu);
401 xen_teardown_timer(cpu);
402
403 if (num_online_cpus() == 1)
404 alternatives_smp_switch(0);
405}
406
407static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */
408{
409 play_dead_common();
410 HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL);
411 cpu_bringup();
412}
413
414#else /* !CONFIG_HOTPLUG_CPU */
415static int xen_cpu_disable(void)
416{
417 return -ENOSYS;
418}
419
420static void xen_cpu_die(unsigned int cpu)
421{
422 BUG();
423}
424
425static void xen_play_dead(void)
426{
427 BUG();
428}
429
430#endif
431static void stop_self(void *v)
432{
433 int cpu = smp_processor_id();
434
435 /* make sure we're not pinning something down */
436 load_cr3(swapper_pg_dir);
437 /* should set up a minimal gdt */
438
439 set_cpu_online(cpu, false);
440
441 HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL);
442 BUG();
443}
444
445static void xen_stop_other_cpus(int wait)
446{
447 smp_call_function(stop_self, NULL, wait);
448}
449
450static void xen_smp_send_reschedule(int cpu)
451{
452 xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
453}
454
455static void xen_send_IPI_mask(const struct cpumask *mask,
456 enum ipi_vector vector)
457{
458 unsigned cpu;
459
460 for_each_cpu_and(cpu, mask, cpu_online_mask)
461 xen_send_IPI_one(cpu, vector);
462}
463
464static void xen_smp_send_call_function_ipi(const struct cpumask *mask)
465{
466 int cpu;
467
468 xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR);
469
470 /* Make sure other vcpus get a chance to run if they need to. */
471 for_each_cpu(cpu, mask) {
472 if (xen_vcpu_stolen(cpu)) {
473 HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
474 break;
475 }
476 }
477}
478
479static void xen_smp_send_call_function_single_ipi(int cpu)
480{
481 xen_send_IPI_mask(cpumask_of(cpu),
482 XEN_CALL_FUNCTION_SINGLE_VECTOR);
483}
484
485static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
486{
487 irq_enter();
488 generic_smp_call_function_interrupt();
489 inc_irq_stat(irq_call_count);
490 irq_exit();
491
492 return IRQ_HANDLED;
493}
494
495static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
496{
497 irq_enter();
498 generic_smp_call_function_single_interrupt();
499 inc_irq_stat(irq_call_count);
500 irq_exit();
501
502 return IRQ_HANDLED;
503}
504
505static const struct smp_ops xen_smp_ops __initconst = {
506 .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu,
507 .smp_prepare_cpus = xen_smp_prepare_cpus,
508 .smp_cpus_done = xen_smp_cpus_done,
509
510 .cpu_up = xen_cpu_up,
511 .cpu_die = xen_cpu_die,
512 .cpu_disable = xen_cpu_disable,
513 .play_dead = xen_play_dead,
514
515 .stop_other_cpus = xen_stop_other_cpus,
516 .smp_send_reschedule = xen_smp_send_reschedule,
517
518 .send_call_func_ipi = xen_smp_send_call_function_ipi,
519 .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi,
520};
521
522void __init xen_smp_init(void)
523{
524 smp_ops = xen_smp_ops;
525 xen_fill_possible_map();
526 xen_init_spinlocks();
527}
528
529static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
530{
531 native_smp_prepare_cpus(max_cpus);
532 WARN_ON(xen_smp_intr_init(0));
533
534 xen_init_lock_cpu(0);
535}
536
537static int __cpuinit xen_hvm_cpu_up(unsigned int cpu)
538{
539 int rc;
540 rc = native_cpu_up(cpu);
541 WARN_ON (xen_smp_intr_init(cpu));
542 return rc;
543}
544
545static void xen_hvm_cpu_die(unsigned int cpu)
546{
547 unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL);
548 unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL);
549 unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL);
550 unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL);
551 native_cpu_die(cpu);
552}
553
554void __init xen_hvm_smp_init(void)
555{
556 if (!xen_have_vector_callback)
557 return;
558 smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
559 smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
560 smp_ops.cpu_up = xen_hvm_cpu_up;
561 smp_ops.cpu_die = xen_hvm_cpu_die;
562 smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
563 smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
564}