2 * Copyright (c) 2015-2016 The FreeBSD Foundation
5 * This software was developed by Andrew Turner under
6 * sponsorship from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include "opt_kstack_pages.h"
32 #include "opt_platform.h"
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/malloc.h>
43 #include <sys/module.h>
44 #include <sys/mutex.h>
46 #include <sys/sched.h>
51 #include <vm/vm_extern.h>
52 #include <vm/vm_kern.h>
54 #include <machine/debug_monitor.h>
55 #include <machine/intr.h>
56 #include <machine/smp.h>
58 #include <machine/vfp.h>
62 #include <dev/ofw/openfirm.h>
63 #include <dev/ofw/ofw_cpu.h>
66 #include <dev/psci/psci.h>
70 typedef void intr_ipi_send_t(void *, cpuset_t, u_int);
71 typedef void intr_ipi_handler_t(void *);
73 #define INTR_IPI_NAMELEN (MAXCOMLEN + 1)
75 intr_ipi_handler_t * ii_handler;
76 void * ii_handler_arg;
77 intr_ipi_send_t * ii_send;
79 char ii_name[INTR_IPI_NAMELEN];
83 static struct intr_ipi ipi_sources[INTR_IPI_COUNT];
85 static struct intr_ipi *intr_ipi_lookup(u_int);
86 static void intr_pic_ipi_setup(u_int, const char *, intr_ipi_handler_t *,
89 boolean_t ofw_cpu_reg(phandle_t node, u_int, cell_t *);
91 extern struct pcpu __pcpu[];
100 static device_identify_t arm64_cpu_identify;
101 static device_probe_t arm64_cpu_probe;
102 static device_attach_t arm64_cpu_attach;
104 static void ipi_ast(void *);
105 static void ipi_hardclock(void *);
106 static void ipi_preempt(void *);
107 static void ipi_rendezvous(void *);
108 static void ipi_stop(void *);
110 static int ipi_handler(void *arg);
112 struct mtx ap_boot_mtx;
113 struct pcb stoppcbs[MAXCPU];
115 static device_t cpu_list[MAXCPU];
118 * Not all systems boot from the first CPU in the device tree. To work around
119 * this we need to find which CPU we have booted from so when we later
120 * enable the secondary CPUs we skip this one.
122 static int cpu0 = -1;
124 void mpentry(unsigned long cpuid);
125 void init_secondary(uint64_t);
127 uint8_t secondary_stacks[MAXCPU - 1][PAGE_SIZE * KSTACK_PAGES] __aligned(16);
129 /* Set to 1 once we're ready to let the APs out of the pen. */
130 volatile int aps_ready = 0;
132 /* Temporary variables for init_secondary() */
133 void *dpcpu[MAXCPU - 1];
135 static device_method_t arm64_cpu_methods[] = {
136 /* Device interface */
137 DEVMETHOD(device_identify, arm64_cpu_identify),
138 DEVMETHOD(device_probe, arm64_cpu_probe),
139 DEVMETHOD(device_attach, arm64_cpu_attach),
144 static devclass_t arm64_cpu_devclass;
145 static driver_t arm64_cpu_driver = {
151 DRIVER_MODULE(arm64_cpu, cpu, arm64_cpu_driver, arm64_cpu_devclass, 0, 0);
154 arm64_cpu_identify(driver_t *driver, device_t parent)
157 if (device_find_child(parent, "arm64_cpu", -1) != NULL)
159 if (BUS_ADD_CHILD(parent, 0, "arm64_cpu", -1) == NULL)
160 device_printf(parent, "add child failed\n");
164 arm64_cpu_probe(device_t dev)
168 cpuid = device_get_unit(dev);
169 if (cpuid >= MAXCPU || cpuid > mp_maxid)
177 arm64_cpu_attach(device_t dev)
184 cpuid = device_get_unit(dev);
186 if (cpuid >= MAXCPU || cpuid > mp_maxid)
188 KASSERT(cpu_list[cpuid] == NULL, ("Already have cpu %u", cpuid));
190 reg = cpu_get_cpuid(dev, ®_size);
195 device_printf(dev, "register <");
196 for (i = 0; i < reg_size; i++)
197 printf("%s%x", (i == 0) ? "" : " ", reg[i]);
201 /* Set the device to start it later */
202 cpu_list[cpuid] = dev;
208 release_aps(void *dummy __unused)
212 intr_pic_ipi_setup(IPI_AST, "ast", ipi_ast, NULL);
213 intr_pic_ipi_setup(IPI_PREEMPT, "preempt", ipi_preempt, NULL);
214 intr_pic_ipi_setup(IPI_RENDEZVOUS, "rendezvous", ipi_rendezvous, NULL);
215 intr_pic_ipi_setup(IPI_STOP, "stop", ipi_stop, NULL);
216 intr_pic_ipi_setup(IPI_STOP_HARD, "stop hard", ipi_stop, NULL);
217 intr_pic_ipi_setup(IPI_HARDCLOCK, "hardclock", ipi_hardclock, NULL);
219 atomic_store_rel_int(&aps_ready, 1);
220 /* Wake up the other CPUs */
221 __asm __volatile("sev");
223 printf("Release APs\n");
225 for (i = 0; i < 2000; i++) {
227 for (cpu = 0; cpu <= mp_maxid; cpu++) {
230 print_cpu_features(cpu);
237 printf("APs not started\n");
239 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, release_aps, NULL);
242 init_secondary(uint64_t cpu)
246 pcpup = &__pcpu[cpu];
248 * Set the pcpu pointer with a backup in tpidr_el1 to be
249 * loaded when entering the kernel from userland.
253 "msr tpidr_el1, %0" :: "r"(pcpup));
255 /* Spin until the BSP releases the APs */
257 __asm __volatile("wfe");
259 /* Initialize curthread */
260 KASSERT(PCPU_GET(idlethread) != NULL, ("no idle thread"));
261 pcpup->pc_curthread = pcpup->pc_idlethread;
262 pcpup->pc_curpcb = pcpup->pc_idlethread->td_pcb;
265 * Identify current CPU. This is necessary to setup
266 * affinity registers and to provide support for
267 * runtime chip identification.
271 intr_pic_init_secondary();
273 /* Start per-CPU event timers. */
282 /* Enable interrupts */
285 mtx_lock_spin(&ap_boot_mtx);
287 atomic_add_rel_32(&smp_cpus, 1);
289 if (smp_cpus == mp_ncpus) {
290 /* enable IPI's, tlb shootdown, freezes etc */
291 atomic_store_rel_int(&smp_started, 1);
294 mtx_unlock_spin(&ap_boot_mtx);
296 /* Enter the scheduler */
299 panic("scheduler returned us to init_secondary");
304 * Send IPI thru interrupt controller.
307 pic_ipi_send(void *arg, cpuset_t cpus, u_int ipi)
310 KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
311 PIC_IPI_SEND(intr_irq_root_dev, arg, cpus, ipi);
315 * Setup IPI handler on interrupt controller.
320 intr_pic_ipi_setup(u_int ipi, const char *name, intr_ipi_handler_t *hand,
323 struct intr_irqsrc *isrc;
327 KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
328 KASSERT(hand != NULL, ("%s: ipi %u no handler", __func__, ipi));
330 error = PIC_IPI_SETUP(intr_irq_root_dev, ipi, &isrc);
334 isrc->isrc_handlers++;
336 ii = intr_ipi_lookup(ipi);
337 KASSERT(ii->ii_count == NULL, ("%s: ipi %u reused", __func__, ipi));
339 ii->ii_handler = hand;
340 ii->ii_handler_arg = arg;
341 ii->ii_send = pic_ipi_send;
342 ii->ii_send_arg = isrc;
343 strlcpy(ii->ii_name, name, INTR_IPI_NAMELEN);
344 ii->ii_count = intr_ipi_setup_counters(name);
348 intr_ipi_send(cpuset_t cpus, u_int ipi)
352 ii = intr_ipi_lookup(ipi);
353 if (ii->ii_count == NULL)
354 panic("%s: not setup IPI %u", __func__, ipi);
356 ii->ii_send(ii->ii_send_arg, cpus, ipi);
360 ipi_ast(void *dummy __unused)
363 CTR0(KTR_SMP, "IPI_AST");
367 ipi_hardclock(void *dummy __unused)
370 CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__);
375 ipi_preempt(void *dummy __unused)
377 CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__);
378 sched_preempt(curthread);
382 ipi_rendezvous(void *dummy __unused)
385 CTR0(KTR_SMP, "IPI_RENDEZVOUS");
386 smp_rendezvous_action();
390 ipi_stop(void *dummy __unused)
394 CTR0(KTR_SMP, "IPI_STOP");
396 cpu = PCPU_GET(cpuid);
397 savectx(&stoppcbs[cpu]);
399 /* Indicate we are stopped */
400 CPU_SET_ATOMIC(cpu, &stopped_cpus);
402 /* Wait for restart */
403 while (!CPU_ISSET(cpu, &started_cpus))
406 CPU_CLR_ATOMIC(cpu, &started_cpus);
407 CPU_CLR_ATOMIC(cpu, &stopped_cpus);
408 CTR0(KTR_SMP, "IPI_STOP (restart)");
415 return (smp_topo_none());
418 /* Determine if we running MP machine */
423 /* ARM64TODO: Read the u bit of mpidr_el1 to determine this */
429 cpu_init_fdt(u_int id, phandle_t node, u_int addr_size, pcell_t *reg)
437 /* Check we are able to start this cpu */
441 KASSERT(id < MAXCPU, ("Too many CPUs"));
443 /* We are already running on cpu 0 */
448 * Rotate the CPU IDs to put the boot CPU as CPU 0. We keep the other
449 * CPUs ordered as the are likely grouped into clusters so it can be
450 * useful to keep that property, e.g. for the GICv3 driver to send
451 * an IPI to all CPUs in the cluster.
455 cpuid += mp_maxid + 1;
458 pcpup = &__pcpu[cpuid];
459 pcpu_init(pcpup, cpuid, sizeof(struct pcpu));
461 dpcpu[cpuid - 1] = (void *)kmem_malloc(kernel_arena, DPCPU_SIZE,
463 dpcpu_init(dpcpu[cpuid - 1], cpuid);
466 if (addr_size == 2) {
468 target_cpu |= reg[1];
471 printf("Starting CPU %u (%lx)\n", cpuid, target_cpu);
472 pa = pmap_extract(kernel_pmap, (vm_offset_t)mpentry);
474 err = psci_cpu_on(target_cpu, pa, cpuid);
475 if (err != PSCI_RETVAL_SUCCESS) {
476 /* Panic here if INVARIANTS are enabled */
477 KASSERT(0, ("Failed to start CPU %u (%lx)\n", id,
481 kmem_free(kernel_arena, (vm_offset_t)dpcpu[cpuid - 1],
483 dpcpu[cpuid - 1] = NULL;
484 /* Notify the user that the CPU failed to start */
485 printf("Failed to start CPU %u (%lx)\n", id, target_cpu);
487 CPU_SET(cpuid, &all_cpus);
493 /* Initialize and fire up non-boot processors */
498 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
500 CPU_SET(0, &all_cpus);
502 switch(cpu_enum_method) {
505 KASSERT(cpu0 >= 0, ("Current CPU was not found"));
506 ofw_cpu_early_foreach(cpu_init_fdt, true);
514 /* Introduce rest of cores to the world */
516 cpu_mp_announce(void)
521 cpu_find_cpu0_fdt(u_int id, phandle_t node, u_int addr_size, pcell_t *reg)
523 uint64_t mpidr_fdt, mpidr_reg;
527 if (addr_size == 2) {
532 mpidr_reg = READ_SPECIALREG(mpidr_el1);
534 if ((mpidr_reg & 0xff00fffffful) == mpidr_fdt)
542 cpu_mp_setmaxid(void)
547 cores = ofw_cpu_early_foreach(cpu_find_cpu0_fdt, false);
549 cores = MIN(cores, MAXCPU);
551 printf("Found %d CPUs in the device tree\n", cores);
553 mp_maxid = cores - 1;
554 cpu_enum_method = CPUS_FDT;
560 printf("No CPU data, limiting to 1 core\n");
568 static struct intr_ipi *
569 intr_ipi_lookup(u_int ipi)
572 if (ipi >= INTR_IPI_COUNT)
573 panic("%s: no such IPI %u", __func__, ipi);
575 return (&ipi_sources[ipi]);
579 * interrupt controller dispatch function for IPIs. It should
580 * be called straight from the interrupt controller, when associated
581 * interrupt source is learned. Or from anybody who has an interrupt
585 intr_ipi_dispatch(u_int ipi, struct trapframe *tf)
590 ii = intr_ipi_lookup(ipi);
591 if (ii->ii_count == NULL)
592 panic("%s: not setup IPI %u", __func__, ipi);
594 intr_ipi_increment_count(ii->ii_count, PCPU_GET(cpuid));
597 * Supply ipi filter with trapframe argument
598 * if none is registered.
600 arg = ii->ii_handler_arg != NULL ? ii->ii_handler_arg : tf;
606 * Map IPI into interrupt controller.
611 ipi_map(struct intr_irqsrc *isrc, u_int ipi)
616 if (ipi >= INTR_IPI_COUNT)
617 panic("%s: no such IPI %u", __func__, ipi);
619 KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
621 isrc->isrc_type = INTR_ISRCT_NAMESPACE;
622 isrc->isrc_nspc_type = INTR_IRQ_NSPC_IPI;
623 isrc->isrc_nspc_num = ipi_next_num;
625 error = PIC_REGISTER(intr_irq_root_dev, isrc, &is_percpu);
627 isrc->isrc_dev = intr_irq_root_dev;
634 * Setup IPI handler to interrupt source.
636 * Note that there could be more ways how to send and receive IPIs
637 * on a platform like fast interrupts for example. In that case,
638 * one can call this function with ASIF_NOALLOC flag set and then
639 * call intr_ipi_dispatch() when appropriate.
644 intr_ipi_set_handler(u_int ipi, const char *name, intr_ipi_filter_t *filter,
645 void *arg, u_int flags)
647 struct intr_irqsrc *isrc;
653 isrc = intr_ipi_lookup(ipi);
654 if (isrc->isrc_ipifilter != NULL)
657 if ((flags & AISHF_NOALLOC) == 0) {
658 error = ipi_map(isrc, ipi);
663 isrc->isrc_ipifilter = filter;
664 isrc->isrc_arg = arg;
665 isrc->isrc_handlers = 1;
666 isrc->isrc_count = intr_ipi_setup_counters(name);
667 isrc->isrc_index = 0; /* it should not be used in IPI case */
669 if (isrc->isrc_dev != NULL) {
670 PIC_ENABLE_INTR(isrc->isrc_dev, isrc);
671 PIC_ENABLE_SOURCE(isrc->isrc_dev, isrc);
679 ipi_all_but_self(u_int ipi)
684 CPU_CLR(PCPU_GET(cpuid), &cpus);
685 CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
686 intr_ipi_send(cpus, ipi);
690 ipi_cpu(int cpu, u_int ipi)
697 CTR3(KTR_SMP, "%s: cpu: %d, ipi: %x", __func__, cpu, ipi);
698 intr_ipi_send(cpus, ipi);
702 ipi_selected(cpuset_t cpus, u_int ipi)
705 CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
706 intr_ipi_send(cpus, ipi);