interconnect: qcom: icc-rpm: Fix peak rate calculation
[linux-2.6-microblaze.git] / arch / arm / xen / enlighten.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <xen/xen.h>
3 #include <xen/events.h>
4 #include <xen/grant_table.h>
5 #include <xen/hvm.h>
6 #include <xen/interface/vcpu.h>
7 #include <xen/interface/xen.h>
8 #include <xen/interface/memory.h>
9 #include <xen/interface/hvm/params.h>
10 #include <xen/features.h>
11 #include <xen/platform_pci.h>
12 #include <xen/xenbus.h>
13 #include <xen/page.h>
14 #include <xen/interface/sched.h>
15 #include <xen/xen-ops.h>
16 #include <asm/xen/hypervisor.h>
17 #include <asm/xen/hypercall.h>
18 #include <asm/system_misc.h>
19 #include <asm/efi.h>
20 #include <linux/interrupt.h>
21 #include <linux/irqreturn.h>
22 #include <linux/module.h>
23 #include <linux/of.h>
24 #include <linux/of_fdt.h>
25 #include <linux/of_irq.h>
26 #include <linux/of_address.h>
27 #include <linux/cpuidle.h>
28 #include <linux/cpufreq.h>
29 #include <linux/cpu.h>
30 #include <linux/console.h>
31 #include <linux/pvclock_gtod.h>
32 #include <linux/reboot.h>
33 #include <linux/time64.h>
34 #include <linux/timekeeping.h>
35 #include <linux/timekeeper_internal.h>
36 #include <linux/acpi.h>
37 #include <linux/virtio_anchor.h>
38
39 #include <linux/mm.h>
40
41 static struct start_info _xen_start_info;
42 struct start_info *xen_start_info = &_xen_start_info;
43 EXPORT_SYMBOL(xen_start_info);
44
45 enum xen_domain_type xen_domain_type = XEN_NATIVE;
46 EXPORT_SYMBOL(xen_domain_type);
47
48 struct shared_info xen_dummy_shared_info;
49 struct shared_info *HYPERVISOR_shared_info = (void *)&xen_dummy_shared_info;
50
51 DEFINE_PER_CPU(struct vcpu_info *, xen_vcpu);
52 static struct vcpu_info __percpu *xen_vcpu_info;
53
54 /* Linux <-> Xen vCPU id mapping */
55 DEFINE_PER_CPU(uint32_t, xen_vcpu_id);
56 EXPORT_PER_CPU_SYMBOL(xen_vcpu_id);
57
58 /* These are unused until we support booting "pre-ballooned" */
59 unsigned long xen_released_pages;
60 struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
61
62 static __read_mostly unsigned int xen_events_irq;
63 static __read_mostly phys_addr_t xen_grant_frames;
64
65 #define GRANT_TABLE_INDEX   0
66 #define EXT_REGION_INDEX    1
67
68 uint32_t xen_start_flags;
69 EXPORT_SYMBOL(xen_start_flags);
70
71 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
72                                int nr, struct page **pages)
73 {
74         return xen_xlate_unmap_gfn_range(vma, nr, pages);
75 }
76 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
77
78 static void xen_read_wallclock(struct timespec64 *ts)
79 {
80         u32 version;
81         struct timespec64 now, ts_monotonic;
82         struct shared_info *s = HYPERVISOR_shared_info;
83         struct pvclock_wall_clock *wall_clock = &(s->wc);
84
85         /* get wallclock at system boot */
86         do {
87                 version = wall_clock->version;
88                 rmb();          /* fetch version before time */
89                 now.tv_sec  = ((uint64_t)wall_clock->sec_hi << 32) | wall_clock->sec;
90                 now.tv_nsec = wall_clock->nsec;
91                 rmb();          /* fetch time before checking version */
92         } while ((wall_clock->version & 1) || (version != wall_clock->version));
93
94         /* time since system boot */
95         ktime_get_ts64(&ts_monotonic);
96         *ts = timespec64_add(now, ts_monotonic);
97 }
98
99 static int xen_pvclock_gtod_notify(struct notifier_block *nb,
100                                    unsigned long was_set, void *priv)
101 {
102         /* Protected by the calling core code serialization */
103         static struct timespec64 next_sync;
104
105         struct xen_platform_op op;
106         struct timespec64 now, system_time;
107         struct timekeeper *tk = priv;
108
109         now.tv_sec = tk->xtime_sec;
110         now.tv_nsec = (long)(tk->tkr_mono.xtime_nsec >> tk->tkr_mono.shift);
111         system_time = timespec64_add(now, tk->wall_to_monotonic);
112
113         /*
114          * We only take the expensive HV call when the clock was set
115          * or when the 11 minutes RTC synchronization time elapsed.
116          */
117         if (!was_set && timespec64_compare(&now, &next_sync) < 0)
118                 return NOTIFY_OK;
119
120         op.cmd = XENPF_settime64;
121         op.u.settime64.mbz = 0;
122         op.u.settime64.secs = now.tv_sec;
123         op.u.settime64.nsecs = now.tv_nsec;
124         op.u.settime64.system_time = timespec64_to_ns(&system_time);
125         (void)HYPERVISOR_platform_op(&op);
126
127         /*
128          * Move the next drift compensation time 11 minutes
129          * ahead. That's emulating the sync_cmos_clock() update for
130          * the hardware RTC.
131          */
132         next_sync = now;
133         next_sync.tv_sec += 11 * 60;
134
135         return NOTIFY_OK;
136 }
137
138 static struct notifier_block xen_pvclock_gtod_notifier = {
139         .notifier_call = xen_pvclock_gtod_notify,
140 };
141
142 static int xen_starting_cpu(unsigned int cpu)
143 {
144         struct vcpu_register_vcpu_info info;
145         struct vcpu_info *vcpup;
146         int err;
147
148         /* 
149          * VCPUOP_register_vcpu_info cannot be called twice for the same
150          * vcpu, so if vcpu_info is already registered, just get out. This
151          * can happen with cpu-hotplug.
152          */
153         if (per_cpu(xen_vcpu, cpu) != NULL)
154                 goto after_register_vcpu_info;
155
156         pr_info("Xen: initializing cpu%d\n", cpu);
157         vcpup = per_cpu_ptr(xen_vcpu_info, cpu);
158
159         info.mfn = percpu_to_gfn(vcpup);
160         info.offset = xen_offset_in_page(vcpup);
161
162         err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
163                                  &info);
164         BUG_ON(err);
165         per_cpu(xen_vcpu, cpu) = vcpup;
166
167 after_register_vcpu_info:
168         enable_percpu_irq(xen_events_irq, 0);
169         return 0;
170 }
171
172 static int xen_dying_cpu(unsigned int cpu)
173 {
174         disable_percpu_irq(xen_events_irq);
175         return 0;
176 }
177
178 void xen_reboot(int reason)
179 {
180         struct sched_shutdown r = { .reason = reason };
181         int rc;
182
183         rc = HYPERVISOR_sched_op(SCHEDOP_shutdown, &r);
184         BUG_ON(rc);
185 }
186
187 static int xen_restart(struct notifier_block *nb, unsigned long action,
188                        void *data)
189 {
190         xen_reboot(SHUTDOWN_reboot);
191
192         return NOTIFY_DONE;
193 }
194
195 static struct notifier_block xen_restart_nb = {
196         .notifier_call = xen_restart,
197         .priority = 192,
198 };
199
200 static void xen_power_off(void)
201 {
202         xen_reboot(SHUTDOWN_poweroff);
203 }
204
205 static irqreturn_t xen_arm_callback(int irq, void *arg)
206 {
207         xen_evtchn_do_upcall();
208         return IRQ_HANDLED;
209 }
210
211 static __initdata struct {
212         const char *compat;
213         const char *prefix;
214         const char *version;
215         bool found;
216 } hyper_node = {"xen,xen", "xen,xen-", NULL, false};
217
218 static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
219                                       int depth, void *data)
220 {
221         const void *s = NULL;
222         int len;
223
224         if (depth != 1 || strcmp(uname, "hypervisor") != 0)
225                 return 0;
226
227         if (of_flat_dt_is_compatible(node, hyper_node.compat))
228                 hyper_node.found = true;
229
230         s = of_get_flat_dt_prop(node, "compatible", &len);
231         if (strlen(hyper_node.prefix) + 3  < len &&
232             !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
233                 hyper_node.version = s + strlen(hyper_node.prefix);
234
235         /*
236          * Check if Xen supports EFI by checking whether there is the
237          * "/hypervisor/uefi" node in DT. If so, runtime services are available
238          * through proxy functions (e.g. in case of Xen dom0 EFI implementation
239          * they call special hypercall which executes relevant EFI functions)
240          * and that is why they are always enabled.
241          */
242         if (IS_ENABLED(CONFIG_XEN_EFI)) {
243                 if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
244                     !efi_runtime_disabled())
245                         set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
246         }
247
248         return 0;
249 }
250
251 /*
252  * see Documentation/devicetree/bindings/arm/xen.txt for the
253  * documentation of the Xen Device Tree format.
254  */
255 void __init xen_early_init(void)
256 {
257         of_scan_flat_dt(fdt_find_hyper_node, NULL);
258         if (!hyper_node.found) {
259                 pr_debug("No Xen support\n");
260                 return;
261         }
262
263         if (hyper_node.version == NULL) {
264                 pr_debug("Xen version not found\n");
265                 return;
266         }
267
268         pr_info("Xen %s support found\n", hyper_node.version);
269
270         xen_domain_type = XEN_HVM_DOMAIN;
271
272         xen_setup_features();
273
274         if (xen_feature(XENFEAT_dom0))
275                 xen_start_flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
276
277         if (!console_set_on_cmdline && !xen_initial_domain())
278                 add_preferred_console("hvc", 0, NULL);
279 }
280
281 static void __init xen_acpi_guest_init(void)
282 {
283 #ifdef CONFIG_ACPI
284         struct xen_hvm_param a;
285         int interrupt, trigger, polarity;
286
287         a.domid = DOMID_SELF;
288         a.index = HVM_PARAM_CALLBACK_IRQ;
289
290         if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
291             || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
292                 xen_events_irq = 0;
293                 return;
294         }
295
296         interrupt = a.value & 0xff;
297         trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
298                                          : ACPI_LEVEL_SENSITIVE;
299         polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
300                                           : ACPI_ACTIVE_HIGH;
301         xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
302 #endif
303 }
304
305 #ifdef CONFIG_XEN_UNPOPULATED_ALLOC
306 /*
307  * A type-less specific Xen resource which contains extended regions
308  * (unused regions of guest physical address space provided by the hypervisor).
309  */
310 static struct resource xen_resource = {
311         .name = "Xen unused space",
312 };
313
314 int __init arch_xen_unpopulated_init(struct resource **res)
315 {
316         struct device_node *np;
317         struct resource *regs, *tmp_res;
318         uint64_t min_gpaddr = -1, max_gpaddr = 0;
319         unsigned int i, nr_reg = 0;
320         int rc;
321
322         if (!xen_domain())
323                 return -ENODEV;
324
325         if (!acpi_disabled)
326                 return -ENODEV;
327
328         np = of_find_compatible_node(NULL, NULL, "xen,xen");
329         if (WARN_ON(!np))
330                 return -ENODEV;
331
332         /* Skip region 0 which is reserved for grant table space */
333         while (of_get_address(np, nr_reg + EXT_REGION_INDEX, NULL, NULL))
334                 nr_reg++;
335
336         if (!nr_reg) {
337                 pr_err("No extended regions are found\n");
338                 of_node_put(np);
339                 return -EINVAL;
340         }
341
342         regs = kcalloc(nr_reg, sizeof(*regs), GFP_KERNEL);
343         if (!regs) {
344                 of_node_put(np);
345                 return -ENOMEM;
346         }
347
348         /*
349          * Create resource from extended regions provided by the hypervisor to be
350          * used as unused address space for Xen scratch pages.
351          */
352         for (i = 0; i < nr_reg; i++) {
353                 rc = of_address_to_resource(np, i + EXT_REGION_INDEX, &regs[i]);
354                 if (rc)
355                         goto err;
356
357                 if (max_gpaddr < regs[i].end)
358                         max_gpaddr = regs[i].end;
359                 if (min_gpaddr > regs[i].start)
360                         min_gpaddr = regs[i].start;
361         }
362
363         xen_resource.start = min_gpaddr;
364         xen_resource.end = max_gpaddr;
365
366         /*
367          * Mark holes between extended regions as unavailable. The rest of that
368          * address space will be available for the allocation.
369          */
370         for (i = 1; i < nr_reg; i++) {
371                 resource_size_t start, end;
372
373                 /* There is an overlap between regions */
374                 if (regs[i - 1].end + 1 > regs[i].start) {
375                         rc = -EINVAL;
376                         goto err;
377                 }
378
379                 /* There is no hole between regions */
380                 if (regs[i - 1].end + 1 == regs[i].start)
381                         continue;
382
383                 start = regs[i - 1].end + 1;
384                 end = regs[i].start - 1;
385
386                 tmp_res = kzalloc(sizeof(*tmp_res), GFP_KERNEL);
387                 if (!tmp_res) {
388                         rc = -ENOMEM;
389                         goto err;
390                 }
391
392                 tmp_res->name = "Unavailable space";
393                 tmp_res->start = start;
394                 tmp_res->end = end;
395
396                 rc = insert_resource(&xen_resource, tmp_res);
397                 if (rc) {
398                         pr_err("Cannot insert resource %pR (%d)\n", tmp_res, rc);
399                         kfree(tmp_res);
400                         goto err;
401                 }
402         }
403
404         *res = &xen_resource;
405
406 err:
407         of_node_put(np);
408         kfree(regs);
409         return rc;
410 }
411 #endif
412
413 static void __init xen_dt_guest_init(void)
414 {
415         struct device_node *xen_node;
416         struct resource res;
417
418         xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
419         if (!xen_node) {
420                 pr_err("Xen support was detected before, but it has disappeared\n");
421                 return;
422         }
423
424         xen_events_irq = irq_of_parse_and_map(xen_node, 0);
425
426         if (of_address_to_resource(xen_node, GRANT_TABLE_INDEX, &res)) {
427                 pr_err("Xen grant table region is not found\n");
428                 of_node_put(xen_node);
429                 return;
430         }
431         of_node_put(xen_node);
432         xen_grant_frames = res.start;
433 }
434
435 static int __init xen_guest_init(void)
436 {
437         struct xen_add_to_physmap xatp;
438         struct shared_info *shared_info_page = NULL;
439         int rc, cpu;
440
441         if (!xen_domain())
442                 return 0;
443
444         if (IS_ENABLED(CONFIG_XEN_VIRTIO))
445                 virtio_set_mem_acc_cb(xen_virtio_restricted_mem_acc);
446
447         if (!acpi_disabled)
448                 xen_acpi_guest_init();
449         else
450                 xen_dt_guest_init();
451
452         if (!xen_events_irq) {
453                 pr_err("Xen event channel interrupt not found\n");
454                 return -ENODEV;
455         }
456
457         /*
458          * The fdt parsing codes have set EFI_RUNTIME_SERVICES if Xen EFI
459          * parameters are found. Force enable runtime services.
460          */
461         if (efi_enabled(EFI_RUNTIME_SERVICES))
462                 xen_efi_runtime_setup();
463
464         shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
465
466         if (!shared_info_page) {
467                 pr_err("not enough memory\n");
468                 return -ENOMEM;
469         }
470         xatp.domid = DOMID_SELF;
471         xatp.idx = 0;
472         xatp.space = XENMAPSPACE_shared_info;
473         xatp.gpfn = virt_to_gfn(shared_info_page);
474         if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
475                 BUG();
476
477         HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
478
479         /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
480          * page, we use it in the event channel upcall and in some pvclock
481          * related functions. 
482          * The shared info contains exactly 1 CPU (the boot CPU). The guest
483          * is required to use VCPUOP_register_vcpu_info to place vcpu info
484          * for secondary CPUs as they are brought up.
485          * For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
486          */
487         xen_vcpu_info = alloc_percpu(struct vcpu_info);
488         if (xen_vcpu_info == NULL)
489                 return -ENOMEM;
490
491         /* Direct vCPU id mapping for ARM guests. */
492         for_each_possible_cpu(cpu)
493                 per_cpu(xen_vcpu_id, cpu) = cpu;
494
495         if (!xen_grant_frames) {
496                 xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
497                 rc = xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
498                                                                                    &xen_auto_xlat_grant_frames.vaddr,
499                                                                                    xen_auto_xlat_grant_frames.count);
500         } else
501                 rc = gnttab_setup_auto_xlat_frames(xen_grant_frames);
502         if (rc) {
503                 free_percpu(xen_vcpu_info);
504                 return rc;
505         }
506         gnttab_init();
507
508         /*
509          * Making sure board specific code will not set up ops for
510          * cpu idle and cpu freq.
511          */
512         disable_cpuidle();
513         disable_cpufreq();
514
515         xen_init_IRQ();
516
517         if (request_percpu_irq(xen_events_irq, xen_arm_callback,
518                                "events", &xen_vcpu)) {
519                 pr_err("Error request IRQ %d\n", xen_events_irq);
520                 return -EINVAL;
521         }
522
523         if (xen_initial_domain())
524                 pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
525
526         return cpuhp_setup_state(CPUHP_AP_ARM_XEN_STARTING,
527                                  "arm/xen:starting", xen_starting_cpu,
528                                  xen_dying_cpu);
529 }
530 early_initcall(xen_guest_init);
531
532 static int xen_starting_runstate_cpu(unsigned int cpu)
533 {
534         xen_setup_runstate_info(cpu);
535         return 0;
536 }
537
538 static int __init xen_late_init(void)
539 {
540         if (!xen_domain())
541                 return -ENODEV;
542
543         pm_power_off = xen_power_off;
544         register_restart_handler(&xen_restart_nb);
545         if (!xen_initial_domain()) {
546                 struct timespec64 ts;
547                 xen_read_wallclock(&ts);
548                 do_settimeofday64(&ts);
549         }
550
551         if (xen_kernel_unmapped_at_usr())
552                 return 0;
553
554         xen_time_setup_guest();
555
556         return cpuhp_setup_state(CPUHP_AP_ARM_XEN_RUNSTATE_STARTING,
557                                  "arm/xen_runstate:starting",
558                                  xen_starting_runstate_cpu, NULL);
559 }
560 late_initcall(xen_late_init);
561
562
563 /* empty stubs */
564 void xen_arch_pre_suspend(void) { }
565 void xen_arch_post_suspend(int suspend_cancelled) { }
566 void xen_timer_resume(void) { }
567 void xen_arch_resume(void) { }
568 void xen_arch_suspend(void) { }
569
570
571 /* In the hypercall.S file. */
572 EXPORT_SYMBOL_GPL(HYPERVISOR_event_channel_op);
573 EXPORT_SYMBOL_GPL(HYPERVISOR_grant_table_op);
574 EXPORT_SYMBOL_GPL(HYPERVISOR_xen_version);
575 EXPORT_SYMBOL_GPL(HYPERVISOR_console_io);
576 EXPORT_SYMBOL_GPL(HYPERVISOR_sched_op);
577 EXPORT_SYMBOL_GPL(HYPERVISOR_hvm_op);
578 EXPORT_SYMBOL_GPL(HYPERVISOR_memory_op);
579 EXPORT_SYMBOL_GPL(HYPERVISOR_physdev_op);
580 EXPORT_SYMBOL_GPL(HYPERVISOR_vcpu_op);
581 EXPORT_SYMBOL_GPL(HYPERVISOR_platform_op_raw);
582 EXPORT_SYMBOL_GPL(HYPERVISOR_multicall);
583 EXPORT_SYMBOL_GPL(HYPERVISOR_vm_assist);
584 EXPORT_SYMBOL_GPL(HYPERVISOR_dm_op);
585 EXPORT_SYMBOL_GPL(privcmd_call);