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Commit | Line | Data |
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f87e4cac JF |
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. | |
f87e4cac JF |
14 | */ |
15 | #include <linux/sched.h> | |
16 | #include <linux/err.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
f87e4cac | 18 | #include <linux/smp.h> |
1ff2b0c3 | 19 | #include <linux/irq_work.h> |
f87e4cac JF |
20 | |
21 | #include <asm/paravirt.h> | |
22 | #include <asm/desc.h> | |
23 | #include <asm/pgtable.h> | |
24 | #include <asm/cpu.h> | |
25 | ||
26 | #include <xen/interface/xen.h> | |
27 | #include <xen/interface/vcpu.h> | |
28 | ||
29 | #include <asm/xen/interface.h> | |
30 | #include <asm/xen/hypercall.h> | |
31 | ||
ea5b8f73 | 32 | #include <xen/xen.h> |
f87e4cac JF |
33 | #include <xen/page.h> |
34 | #include <xen/events.h> | |
35 | ||
ed467e69 | 36 | #include <xen/hvc-console.h> |
f87e4cac JF |
37 | #include "xen-ops.h" |
38 | #include "mmu.h" | |
39 | ||
b78936e1 | 40 | cpumask_var_t xen_cpu_initialized_map; |
f87e4cac | 41 | |
c6e22f9e TH |
42 | static DEFINE_PER_CPU(int, xen_resched_irq); |
43 | static DEFINE_PER_CPU(int, xen_callfunc_irq); | |
44 | static DEFINE_PER_CPU(int, xen_callfuncsingle_irq); | |
1ff2b0c3 | 45 | static DEFINE_PER_CPU(int, xen_irq_work); |
c6e22f9e | 46 | static DEFINE_PER_CPU(int, xen_debug_irq) = -1; |
f87e4cac JF |
47 | |
48 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id); | |
3b16cf87 | 49 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id); |
1ff2b0c3 | 50 | static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id); |
f87e4cac JF |
51 | |
52 | /* | |
184748cc | 53 | * Reschedule call back. |
f87e4cac JF |
54 | */ |
55 | static irqreturn_t xen_reschedule_interrupt(int irq, void *dev_id) | |
56 | { | |
1b437c8c | 57 | inc_irq_stat(irq_resched_count); |
184748cc | 58 | scheduler_ipi(); |
38bb5ab4 | 59 | |
f87e4cac JF |
60 | return IRQ_HANDLED; |
61 | } | |
62 | ||
b53cedeb | 63 | static void __cpuinit cpu_bringup(void) |
f87e4cac | 64 | { |
e8c9e788 | 65 | int cpu; |
f87e4cac JF |
66 | |
67 | cpu_init(); | |
d68d82af | 68 | touch_softlockup_watchdog(); |
c7b75947 JF |
69 | preempt_disable(); |
70 | ||
e2a81baf | 71 | xen_enable_sysenter(); |
6fcac6d3 | 72 | xen_enable_syscall(); |
f87e4cac | 73 | |
c7b75947 JF |
74 | cpu = smp_processor_id(); |
75 | smp_store_cpu_info(cpu); | |
76 | cpu_data(cpu).x86_max_cores = 1; | |
77 | set_cpu_sibling_map(cpu); | |
f87e4cac JF |
78 | |
79 | xen_setup_cpu_clockevents(); | |
80 | ||
106b4438 KRW |
81 | notify_cpu_starting(cpu); |
82 | ||
d7d3756c | 83 | set_cpu_online(cpu, true); |
106b4438 | 84 | |
2113f469 | 85 | this_cpu_write(cpu_state, CPU_ONLINE); |
106b4438 | 86 | |
c7b75947 JF |
87 | wmb(); |
88 | ||
f87e4cac JF |
89 | /* We can take interrupts now: we're officially "up". */ |
90 | local_irq_enable(); | |
91 | ||
92 | wmb(); /* make sure everything is out */ | |
d68d82af AN |
93 | } |
94 | ||
b53cedeb | 95 | static void __cpuinit cpu_bringup_and_idle(void) |
d68d82af AN |
96 | { |
97 | cpu_bringup(); | |
7d1a9417 | 98 | cpu_startup_entry(CPUHP_ONLINE); |
f87e4cac JF |
99 | } |
100 | ||
101 | static int xen_smp_intr_init(unsigned int cpu) | |
102 | { | |
103 | int rc; | |
ee523ca1 | 104 | const char *resched_name, *callfunc_name, *debug_name; |
f87e4cac JF |
105 | |
106 | resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu); | |
107 | rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR, | |
108 | cpu, | |
109 | xen_reschedule_interrupt, | |
110 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, | |
111 | resched_name, | |
112 | NULL); | |
113 | if (rc < 0) | |
114 | goto fail; | |
c6e22f9e | 115 | per_cpu(xen_resched_irq, cpu) = rc; |
f87e4cac JF |
116 | |
117 | callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu); | |
118 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR, | |
119 | cpu, | |
120 | xen_call_function_interrupt, | |
121 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, | |
122 | callfunc_name, | |
123 | NULL); | |
124 | if (rc < 0) | |
125 | goto fail; | |
c6e22f9e | 126 | per_cpu(xen_callfunc_irq, cpu) = rc; |
f87e4cac | 127 | |
ee523ca1 JF |
128 | debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu); |
129 | rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt, | |
130 | IRQF_DISABLED | IRQF_PERCPU | IRQF_NOBALANCING, | |
131 | debug_name, NULL); | |
132 | if (rc < 0) | |
133 | goto fail; | |
c6e22f9e | 134 | per_cpu(xen_debug_irq, cpu) = rc; |
ee523ca1 | 135 | |
3b16cf87 JA |
136 | callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu); |
137 | rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR, | |
138 | cpu, | |
139 | xen_call_function_single_interrupt, | |
140 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, | |
141 | callfunc_name, | |
142 | NULL); | |
143 | if (rc < 0) | |
144 | goto fail; | |
c6e22f9e | 145 | per_cpu(xen_callfuncsingle_irq, cpu) = rc; |
3b16cf87 | 146 | |
27d8b207 KRW |
147 | /* |
148 | * The IRQ worker on PVHVM goes through the native path and uses the | |
149 | * IPI mechanism. | |
150 | */ | |
151 | if (xen_hvm_domain()) | |
152 | return 0; | |
153 | ||
1ff2b0c3 LM |
154 | callfunc_name = kasprintf(GFP_KERNEL, "irqwork%d", cpu); |
155 | rc = bind_ipi_to_irqhandler(XEN_IRQ_WORK_VECTOR, | |
156 | cpu, | |
157 | xen_irq_work_interrupt, | |
158 | IRQF_DISABLED|IRQF_PERCPU|IRQF_NOBALANCING, | |
159 | callfunc_name, | |
160 | NULL); | |
161 | if (rc < 0) | |
162 | goto fail; | |
163 | per_cpu(xen_irq_work, cpu) = rc; | |
164 | ||
f87e4cac JF |
165 | return 0; |
166 | ||
167 | fail: | |
c6e22f9e TH |
168 | if (per_cpu(xen_resched_irq, cpu) >= 0) |
169 | unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL); | |
170 | if (per_cpu(xen_callfunc_irq, cpu) >= 0) | |
171 | unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL); | |
172 | if (per_cpu(xen_debug_irq, cpu) >= 0) | |
173 | unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL); | |
174 | if (per_cpu(xen_callfuncsingle_irq, cpu) >= 0) | |
175 | unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), | |
176 | NULL); | |
27d8b207 KRW |
177 | if (xen_hvm_domain()) |
178 | return rc; | |
179 | ||
1ff2b0c3 LM |
180 | if (per_cpu(xen_irq_work, cpu) >= 0) |
181 | unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL); | |
3b16cf87 | 182 | |
f87e4cac JF |
183 | return rc; |
184 | } | |
185 | ||
c7b75947 | 186 | static void __init xen_fill_possible_map(void) |
f87e4cac JF |
187 | { |
188 | int i, rc; | |
189 | ||
ea5b8f73 SS |
190 | if (xen_initial_domain()) |
191 | return; | |
192 | ||
193 | for (i = 0; i < nr_cpu_ids; i++) { | |
194 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); | |
195 | if (rc >= 0) { | |
196 | num_processors++; | |
197 | set_cpu_possible(i, true); | |
198 | } | |
199 | } | |
200 | } | |
201 | ||
202 | static void __init xen_filter_cpu_maps(void) | |
203 | { | |
204 | int i, rc; | |
cf405ae6 | 205 | unsigned int subtract = 0; |
ea5b8f73 SS |
206 | |
207 | if (!xen_initial_domain()) | |
208 | return; | |
209 | ||
801fd14a SS |
210 | num_processors = 0; |
211 | disabled_cpus = 0; | |
e7986739 | 212 | for (i = 0; i < nr_cpu_ids; i++) { |
f87e4cac | 213 | rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL); |
4560a294 JF |
214 | if (rc >= 0) { |
215 | num_processors++; | |
4f062896 | 216 | set_cpu_possible(i, true); |
801fd14a SS |
217 | } else { |
218 | set_cpu_possible(i, false); | |
219 | set_cpu_present(i, false); | |
cf405ae6 | 220 | subtract++; |
4560a294 | 221 | } |
f87e4cac | 222 | } |
cf405ae6 KRW |
223 | #ifdef CONFIG_HOTPLUG_CPU |
224 | /* This is akin to using 'nr_cpus' on the Linux command line. | |
225 | * Which is OK as when we use 'dom0_max_vcpus=X' we can only | |
226 | * have up to X, while nr_cpu_ids is greater than X. This | |
227 | * normally is not a problem, except when CPU hotplugging | |
228 | * is involved and then there might be more than X CPUs | |
229 | * in the guest - which will not work as there is no | |
230 | * hypercall to expand the max number of VCPUs an already | |
231 | * running guest has. So cap it up to X. */ | |
232 | if (subtract) | |
233 | nr_cpu_ids = nr_cpu_ids - subtract; | |
234 | #endif | |
235 | ||
f87e4cac JF |
236 | } |
237 | ||
a9e7062d | 238 | static void __init xen_smp_prepare_boot_cpu(void) |
f87e4cac | 239 | { |
f87e4cac JF |
240 | BUG_ON(smp_processor_id() != 0); |
241 | native_smp_prepare_boot_cpu(); | |
242 | ||
f87e4cac JF |
243 | /* We've switched to the "real" per-cpu gdt, so make sure the |
244 | old memory can be recycled */ | |
38341432 | 245 | make_lowmem_page_readwrite(xen_initial_gdt); |
60223a32 | 246 | |
ea5b8f73 | 247 | xen_filter_cpu_maps(); |
60223a32 | 248 | xen_setup_vcpu_info_placement(); |
f87e4cac JF |
249 | } |
250 | ||
a9e7062d | 251 | static void __init xen_smp_prepare_cpus(unsigned int max_cpus) |
f87e4cac JF |
252 | { |
253 | unsigned cpu; | |
900cba88 | 254 | unsigned int i; |
f87e4cac | 255 | |
ed467e69 KRW |
256 | if (skip_ioapic_setup) { |
257 | char *m = (max_cpus == 0) ? | |
258 | "The nosmp parameter is incompatible with Xen; " \ | |
259 | "use Xen dom0_max_vcpus=1 parameter" : | |
260 | "The noapic parameter is incompatible with Xen"; | |
261 | ||
262 | xen_raw_printk(m); | |
263 | panic(m); | |
264 | } | |
2d9e1e2f JF |
265 | xen_init_lock_cpu(0); |
266 | ||
06d0b5d9 | 267 | smp_store_boot_cpu_info(); |
c7b75947 | 268 | cpu_data(0).x86_max_cores = 1; |
900cba88 AJ |
269 | |
270 | for_each_possible_cpu(i) { | |
271 | zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL); | |
272 | zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL); | |
273 | zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL); | |
274 | } | |
f87e4cac JF |
275 | set_cpu_sibling_map(0); |
276 | ||
277 | if (xen_smp_intr_init(0)) | |
278 | BUG(); | |
279 | ||
b78936e1 MT |
280 | if (!alloc_cpumask_var(&xen_cpu_initialized_map, GFP_KERNEL)) |
281 | panic("could not allocate xen_cpu_initialized_map\n"); | |
282 | ||
283 | cpumask_copy(xen_cpu_initialized_map, cpumask_of(0)); | |
f87e4cac JF |
284 | |
285 | /* Restrict the possible_map according to max_cpus. */ | |
286 | while ((num_possible_cpus() > 1) && (num_possible_cpus() > max_cpus)) { | |
e7986739 | 287 | for (cpu = nr_cpu_ids - 1; !cpu_possible(cpu); cpu--) |
f87e4cac | 288 | continue; |
4f062896 | 289 | set_cpu_possible(cpu, false); |
f87e4cac JF |
290 | } |
291 | ||
7eb43a6d | 292 | for_each_possible_cpu(cpu) |
4f062896 | 293 | set_cpu_present(cpu, true); |
f87e4cac JF |
294 | } |
295 | ||
b53cedeb | 296 | static int __cpuinit |
f87e4cac JF |
297 | cpu_initialize_context(unsigned int cpu, struct task_struct *idle) |
298 | { | |
299 | struct vcpu_guest_context *ctxt; | |
c7b75947 | 300 | struct desc_struct *gdt; |
9976b39b | 301 | unsigned long gdt_mfn; |
f87e4cac | 302 | |
b78936e1 | 303 | if (cpumask_test_and_set_cpu(cpu, xen_cpu_initialized_map)) |
f87e4cac JF |
304 | return 0; |
305 | ||
306 | ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL); | |
307 | if (ctxt == NULL) | |
308 | return -ENOMEM; | |
309 | ||
c7b75947 JF |
310 | gdt = get_cpu_gdt_table(cpu); |
311 | ||
f87e4cac | 312 | ctxt->flags = VGCF_IN_KERNEL; |
f87e4cac | 313 | ctxt->user_regs.ss = __KERNEL_DS; |
c7b75947 JF |
314 | #ifdef CONFIG_X86_32 |
315 | ctxt->user_regs.fs = __KERNEL_PERCPU; | |
577eebea | 316 | ctxt->user_regs.gs = __KERNEL_STACK_CANARY; |
795f99b6 JF |
317 | #else |
318 | ctxt->gs_base_kernel = per_cpu_offset(cpu); | |
c7b75947 | 319 | #endif |
f87e4cac | 320 | ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle; |
f87e4cac JF |
321 | |
322 | memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt)); | |
323 | ||
dacd45f4 KRW |
324 | { |
325 | ctxt->user_regs.eflags = 0x1000; /* IOPL_RING1 */ | |
326 | ctxt->user_regs.ds = __USER_DS; | |
327 | ctxt->user_regs.es = __USER_DS; | |
f87e4cac | 328 | |
dacd45f4 | 329 | xen_copy_trap_info(ctxt->trap_ctxt); |
f87e4cac | 330 | |
dacd45f4 | 331 | ctxt->ldt_ents = 0; |
9976b39b | 332 | |
dacd45f4 | 333 | BUG_ON((unsigned long)gdt & ~PAGE_MASK); |
f87e4cac | 334 | |
dacd45f4 KRW |
335 | gdt_mfn = arbitrary_virt_to_mfn(gdt); |
336 | make_lowmem_page_readonly(gdt); | |
337 | make_lowmem_page_readonly(mfn_to_virt(gdt_mfn)); | |
f87e4cac | 338 | |
dacd45f4 KRW |
339 | ctxt->gdt_frames[0] = gdt_mfn; |
340 | ctxt->gdt_ents = GDT_ENTRIES; | |
f87e4cac | 341 | |
dacd45f4 KRW |
342 | ctxt->kernel_ss = __KERNEL_DS; |
343 | ctxt->kernel_sp = idle->thread.sp0; | |
f87e4cac | 344 | |
c7b75947 | 345 | #ifdef CONFIG_X86_32 |
dacd45f4 KRW |
346 | ctxt->event_callback_cs = __KERNEL_CS; |
347 | ctxt->failsafe_callback_cs = __KERNEL_CS; | |
c7b75947 | 348 | #endif |
dacd45f4 KRW |
349 | ctxt->event_callback_eip = |
350 | (unsigned long)xen_hypervisor_callback; | |
351 | ctxt->failsafe_callback_eip = | |
352 | (unsigned long)xen_failsafe_callback; | |
353 | } | |
354 | ctxt->user_regs.cs = __KERNEL_CS; | |
355 | ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs); | |
f87e4cac JF |
356 | |
357 | per_cpu(xen_cr3, cpu) = __pa(swapper_pg_dir); | |
358 | ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir)); | |
359 | ||
360 | if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) | |
361 | BUG(); | |
362 | ||
363 | kfree(ctxt); | |
364 | return 0; | |
365 | } | |
366 | ||
7eb43a6d | 367 | static int __cpuinit xen_cpu_up(unsigned int cpu, struct task_struct *idle) |
f87e4cac | 368 | { |
f87e4cac JF |
369 | int rc; |
370 | ||
c6f5e0ac | 371 | per_cpu(current_task, cpu) = idle; |
c7b75947 | 372 | #ifdef CONFIG_X86_32 |
f87e4cac | 373 | irq_ctx_init(cpu); |
c7b75947 | 374 | #else |
c7b75947 | 375 | clear_tsk_thread_flag(idle, TIF_FORK); |
38341432 JF |
376 | per_cpu(kernel_stack, cpu) = |
377 | (unsigned long)task_stack_page(idle) - | |
378 | KERNEL_STACK_OFFSET + THREAD_SIZE; | |
c7b75947 | 379 | #endif |
02889672 | 380 | xen_setup_runstate_info(cpu); |
f87e4cac | 381 | xen_setup_timer(cpu); |
2d9e1e2f | 382 | xen_init_lock_cpu(cpu); |
f87e4cac | 383 | |
c7b75947 JF |
384 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
385 | ||
f87e4cac JF |
386 | /* make sure interrupts start blocked */ |
387 | per_cpu(xen_vcpu, cpu)->evtchn_upcall_mask = 1; | |
388 | ||
389 | rc = cpu_initialize_context(cpu, idle); | |
390 | if (rc) | |
391 | return rc; | |
392 | ||
393 | if (num_online_cpus() == 1) | |
816afe4f RR |
394 | /* Just in case we booted with a single CPU. */ |
395 | alternatives_enable_smp(); | |
f87e4cac JF |
396 | |
397 | rc = xen_smp_intr_init(cpu); | |
398 | if (rc) | |
399 | return rc; | |
400 | ||
f87e4cac JF |
401 | rc = HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL); |
402 | BUG_ON(rc); | |
403 | ||
c7b75947 | 404 | while(per_cpu(cpu_state, cpu) != CPU_ONLINE) { |
1207cf8e | 405 | HYPERVISOR_sched_op(SCHEDOP_yield, NULL); |
c7b75947 JF |
406 | barrier(); |
407 | } | |
408 | ||
f87e4cac JF |
409 | return 0; |
410 | } | |
411 | ||
a9e7062d | 412 | static void xen_smp_cpus_done(unsigned int max_cpus) |
f87e4cac JF |
413 | { |
414 | } | |
415 | ||
2737146b | 416 | #ifdef CONFIG_HOTPLUG_CPU |
26fd1051 | 417 | static int xen_cpu_disable(void) |
d68d82af AN |
418 | { |
419 | unsigned int cpu = smp_processor_id(); | |
420 | if (cpu == 0) | |
421 | return -EBUSY; | |
422 | ||
423 | cpu_disable_common(); | |
424 | ||
425 | load_cr3(swapper_pg_dir); | |
426 | return 0; | |
427 | } | |
428 | ||
26fd1051 | 429 | static void xen_cpu_die(unsigned int cpu) |
d68d82af | 430 | { |
b12abaa1 | 431 | while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up, cpu, NULL)) { |
d68d82af AN |
432 | current->state = TASK_UNINTERRUPTIBLE; |
433 | schedule_timeout(HZ/10); | |
434 | } | |
c6e22f9e TH |
435 | unbind_from_irqhandler(per_cpu(xen_resched_irq, cpu), NULL); |
436 | unbind_from_irqhandler(per_cpu(xen_callfunc_irq, cpu), NULL); | |
437 | unbind_from_irqhandler(per_cpu(xen_debug_irq, cpu), NULL); | |
438 | unbind_from_irqhandler(per_cpu(xen_callfuncsingle_irq, cpu), NULL); | |
b12abaa1 KRW |
439 | if (!xen_hvm_domain()) |
440 | unbind_from_irqhandler(per_cpu(xen_irq_work, cpu), NULL); | |
d68d82af AN |
441 | xen_uninit_lock_cpu(cpu); |
442 | xen_teardown_timer(cpu); | |
d68d82af AN |
443 | } |
444 | ||
71709247 | 445 | static void __cpuinit xen_play_dead(void) /* used only with HOTPLUG_CPU */ |
d68d82af AN |
446 | { |
447 | play_dead_common(); | |
448 | HYPERVISOR_vcpu_op(VCPUOP_down, smp_processor_id(), NULL); | |
449 | cpu_bringup(); | |
450 | } | |
451 | ||
2737146b | 452 | #else /* !CONFIG_HOTPLUG_CPU */ |
26fd1051 | 453 | static int xen_cpu_disable(void) |
2737146b AN |
454 | { |
455 | return -ENOSYS; | |
456 | } | |
457 | ||
26fd1051 | 458 | static void xen_cpu_die(unsigned int cpu) |
2737146b AN |
459 | { |
460 | BUG(); | |
461 | } | |
462 | ||
26fd1051 | 463 | static void xen_play_dead(void) |
2737146b AN |
464 | { |
465 | BUG(); | |
466 | } | |
467 | ||
468 | #endif | |
f87e4cac JF |
469 | static void stop_self(void *v) |
470 | { | |
471 | int cpu = smp_processor_id(); | |
472 | ||
473 | /* make sure we're not pinning something down */ | |
474 | load_cr3(swapper_pg_dir); | |
475 | /* should set up a minimal gdt */ | |
476 | ||
086748e5 IC |
477 | set_cpu_online(cpu, false); |
478 | ||
f87e4cac JF |
479 | HYPERVISOR_vcpu_op(VCPUOP_down, cpu, NULL); |
480 | BUG(); | |
481 | } | |
482 | ||
76fac077 | 483 | static void xen_stop_other_cpus(int wait) |
f87e4cac | 484 | { |
76fac077 | 485 | smp_call_function(stop_self, NULL, wait); |
f87e4cac JF |
486 | } |
487 | ||
a9e7062d | 488 | static void xen_smp_send_reschedule(int cpu) |
f87e4cac JF |
489 | { |
490 | xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR); | |
491 | } | |
492 | ||
f447d56d BG |
493 | static void __xen_send_IPI_mask(const struct cpumask *mask, |
494 | int vector) | |
f87e4cac JF |
495 | { |
496 | unsigned cpu; | |
497 | ||
bcda016e | 498 | for_each_cpu_and(cpu, mask, cpu_online_mask) |
f87e4cac JF |
499 | xen_send_IPI_one(cpu, vector); |
500 | } | |
501 | ||
bcda016e | 502 | static void xen_smp_send_call_function_ipi(const struct cpumask *mask) |
3b16cf87 JA |
503 | { |
504 | int cpu; | |
505 | ||
f447d56d | 506 | __xen_send_IPI_mask(mask, XEN_CALL_FUNCTION_VECTOR); |
3b16cf87 JA |
507 | |
508 | /* Make sure other vcpus get a chance to run if they need to. */ | |
bcda016e | 509 | for_each_cpu(cpu, mask) { |
3b16cf87 | 510 | if (xen_vcpu_stolen(cpu)) { |
1207cf8e | 511 | HYPERVISOR_sched_op(SCHEDOP_yield, NULL); |
3b16cf87 JA |
512 | break; |
513 | } | |
514 | } | |
515 | } | |
516 | ||
a9e7062d | 517 | static void xen_smp_send_call_function_single_ipi(int cpu) |
3b16cf87 | 518 | { |
f447d56d | 519 | __xen_send_IPI_mask(cpumask_of(cpu), |
e7986739 | 520 | XEN_CALL_FUNCTION_SINGLE_VECTOR); |
3b16cf87 JA |
521 | } |
522 | ||
f447d56d BG |
523 | static inline int xen_map_vector(int vector) |
524 | { | |
525 | int xen_vector; | |
526 | ||
527 | switch (vector) { | |
528 | case RESCHEDULE_VECTOR: | |
529 | xen_vector = XEN_RESCHEDULE_VECTOR; | |
530 | break; | |
531 | case CALL_FUNCTION_VECTOR: | |
532 | xen_vector = XEN_CALL_FUNCTION_VECTOR; | |
533 | break; | |
534 | case CALL_FUNCTION_SINGLE_VECTOR: | |
535 | xen_vector = XEN_CALL_FUNCTION_SINGLE_VECTOR; | |
536 | break; | |
1ff2b0c3 LM |
537 | case IRQ_WORK_VECTOR: |
538 | xen_vector = XEN_IRQ_WORK_VECTOR; | |
539 | break; | |
f447d56d BG |
540 | default: |
541 | xen_vector = -1; | |
542 | printk(KERN_ERR "xen: vector 0x%x is not implemented\n", | |
543 | vector); | |
544 | } | |
545 | ||
546 | return xen_vector; | |
547 | } | |
548 | ||
549 | void xen_send_IPI_mask(const struct cpumask *mask, | |
550 | int vector) | |
551 | { | |
552 | int xen_vector = xen_map_vector(vector); | |
553 | ||
554 | if (xen_vector >= 0) | |
555 | __xen_send_IPI_mask(mask, xen_vector); | |
556 | } | |
557 | ||
558 | void xen_send_IPI_all(int vector) | |
559 | { | |
560 | int xen_vector = xen_map_vector(vector); | |
561 | ||
562 | if (xen_vector >= 0) | |
563 | __xen_send_IPI_mask(cpu_online_mask, xen_vector); | |
564 | } | |
565 | ||
566 | void xen_send_IPI_self(int vector) | |
567 | { | |
568 | int xen_vector = xen_map_vector(vector); | |
569 | ||
570 | if (xen_vector >= 0) | |
571 | xen_send_IPI_one(smp_processor_id(), xen_vector); | |
572 | } | |
573 | ||
574 | void xen_send_IPI_mask_allbutself(const struct cpumask *mask, | |
575 | int vector) | |
576 | { | |
577 | unsigned cpu; | |
578 | unsigned int this_cpu = smp_processor_id(); | |
579 | ||
580 | if (!(num_online_cpus() > 1)) | |
581 | return; | |
582 | ||
583 | for_each_cpu_and(cpu, mask, cpu_online_mask) { | |
584 | if (this_cpu == cpu) | |
585 | continue; | |
586 | ||
587 | xen_smp_send_call_function_single_ipi(cpu); | |
588 | } | |
589 | } | |
590 | ||
591 | void xen_send_IPI_allbutself(int vector) | |
592 | { | |
593 | int xen_vector = xen_map_vector(vector); | |
594 | ||
595 | if (xen_vector >= 0) | |
596 | xen_send_IPI_mask_allbutself(cpu_online_mask, xen_vector); | |
597 | } | |
598 | ||
f87e4cac JF |
599 | static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id) |
600 | { | |
f87e4cac | 601 | irq_enter(); |
3b16cf87 | 602 | generic_smp_call_function_interrupt(); |
1b437c8c | 603 | inc_irq_stat(irq_call_count); |
f87e4cac JF |
604 | irq_exit(); |
605 | ||
f87e4cac JF |
606 | return IRQ_HANDLED; |
607 | } | |
608 | ||
3b16cf87 | 609 | static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id) |
f87e4cac | 610 | { |
3b16cf87 JA |
611 | irq_enter(); |
612 | generic_smp_call_function_single_interrupt(); | |
1b437c8c | 613 | inc_irq_stat(irq_call_count); |
3b16cf87 | 614 | irq_exit(); |
f87e4cac | 615 | |
3b16cf87 | 616 | return IRQ_HANDLED; |
f87e4cac | 617 | } |
a9e7062d | 618 | |
1ff2b0c3 LM |
619 | static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id) |
620 | { | |
621 | irq_enter(); | |
622 | irq_work_run(); | |
623 | inc_irq_stat(apic_irq_work_irqs); | |
624 | irq_exit(); | |
625 | ||
626 | return IRQ_HANDLED; | |
627 | } | |
628 | ||
b53cedeb | 629 | static const struct smp_ops xen_smp_ops __initconst = { |
a9e7062d JF |
630 | .smp_prepare_boot_cpu = xen_smp_prepare_boot_cpu, |
631 | .smp_prepare_cpus = xen_smp_prepare_cpus, | |
a9e7062d JF |
632 | .smp_cpus_done = xen_smp_cpus_done, |
633 | ||
d68d82af AN |
634 | .cpu_up = xen_cpu_up, |
635 | .cpu_die = xen_cpu_die, | |
636 | .cpu_disable = xen_cpu_disable, | |
637 | .play_dead = xen_play_dead, | |
638 | ||
76fac077 | 639 | .stop_other_cpus = xen_stop_other_cpus, |
a9e7062d JF |
640 | .smp_send_reschedule = xen_smp_send_reschedule, |
641 | ||
642 | .send_call_func_ipi = xen_smp_send_call_function_ipi, | |
643 | .send_call_func_single_ipi = xen_smp_send_call_function_single_ipi, | |
644 | }; | |
645 | ||
646 | void __init xen_smp_init(void) | |
647 | { | |
648 | smp_ops = xen_smp_ops; | |
c7b75947 | 649 | xen_fill_possible_map(); |
2d9e1e2f | 650 | xen_init_spinlocks(); |
a9e7062d | 651 | } |
99bbb3a8 SS |
652 | |
653 | static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus) | |
654 | { | |
655 | native_smp_prepare_cpus(max_cpus); | |
656 | WARN_ON(xen_smp_intr_init(0)); | |
657 | ||
99bbb3a8 | 658 | xen_init_lock_cpu(0); |
99bbb3a8 SS |
659 | } |
660 | ||
5cdaf183 | 661 | static int __cpuinit xen_hvm_cpu_up(unsigned int cpu, struct task_struct *tidle) |
99bbb3a8 SS |
662 | { |
663 | int rc; | |
5cdaf183 | 664 | rc = native_cpu_up(cpu, tidle); |
99bbb3a8 SS |
665 | WARN_ON (xen_smp_intr_init(cpu)); |
666 | return rc; | |
667 | } | |
668 | ||
669 | static void xen_hvm_cpu_die(unsigned int cpu) | |
670 | { | |
b12abaa1 | 671 | xen_cpu_die(cpu); |
99bbb3a8 SS |
672 | native_cpu_die(cpu); |
673 | } | |
674 | ||
675 | void __init xen_hvm_smp_init(void) | |
676 | { | |
3c05c4be SS |
677 | if (!xen_have_vector_callback) |
678 | return; | |
99bbb3a8 SS |
679 | smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus; |
680 | smp_ops.smp_send_reschedule = xen_smp_send_reschedule; | |
681 | smp_ops.cpu_up = xen_hvm_cpu_up; | |
682 | smp_ops.cpu_die = xen_hvm_cpu_die; | |
683 | smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi; | |
684 | smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi; | |
685 | } |