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/machdep.h>
56 #include <machine/intr.h>
57 #include <machine/smp.h>
59 #include <machine/vfp.h>
63 #include <dev/ofw/openfirm.h>
64 #include <dev/ofw/ofw_cpu.h>
67 #include <dev/psci/psci.h>
71 typedef void intr_ipi_send_t(void *, cpuset_t, u_int);
72 typedef void intr_ipi_handler_t(void *);
74 #define INTR_IPI_NAMELEN (MAXCOMLEN + 1)
76 intr_ipi_handler_t * ii_handler;
77 void * ii_handler_arg;
78 intr_ipi_send_t * ii_send;
80 char ii_name[INTR_IPI_NAMELEN];
84 static struct intr_ipi ipi_sources[INTR_IPI_COUNT];
86 static struct intr_ipi *intr_ipi_lookup(u_int);
87 static void intr_pic_ipi_setup(u_int, const char *, intr_ipi_handler_t *,
90 extern struct pcpu __pcpu[];
92 static device_identify_t arm64_cpu_identify;
93 static device_probe_t arm64_cpu_probe;
94 static device_attach_t arm64_cpu_attach;
96 static void ipi_ast(void *);
97 static void ipi_hardclock(void *);
98 static void ipi_preempt(void *);
99 static void ipi_rendezvous(void *);
100 static void ipi_stop(void *);
102 static int ipi_handler(void *arg);
104 struct mtx ap_boot_mtx;
105 struct pcb stoppcbs[MAXCPU];
107 static device_t cpu_list[MAXCPU];
110 * Not all systems boot from the first CPU in the device tree. To work around
111 * this we need to find which CPU we have booted from so when we later
112 * enable the secondary CPUs we skip this one.
114 static int cpu0 = -1;
116 void mpentry(unsigned long cpuid);
117 void init_secondary(uint64_t);
119 uint8_t secondary_stacks[MAXCPU - 1][PAGE_SIZE * KSTACK_PAGES] __aligned(16);
121 /* Set to 1 once we're ready to let the APs out of the pen. */
122 volatile int aps_ready = 0;
124 /* Temporary variables for init_secondary() */
125 void *dpcpu[MAXCPU - 1];
127 static device_method_t arm64_cpu_methods[] = {
128 /* Device interface */
129 DEVMETHOD(device_identify, arm64_cpu_identify),
130 DEVMETHOD(device_probe, arm64_cpu_probe),
131 DEVMETHOD(device_attach, arm64_cpu_attach),
136 static devclass_t arm64_cpu_devclass;
137 static driver_t arm64_cpu_driver = {
143 DRIVER_MODULE(arm64_cpu, cpu, arm64_cpu_driver, arm64_cpu_devclass, 0, 0);
146 arm64_cpu_identify(driver_t *driver, device_t parent)
149 if (device_find_child(parent, "arm64_cpu", -1) != NULL)
151 if (BUS_ADD_CHILD(parent, 0, "arm64_cpu", -1) == NULL)
152 device_printf(parent, "add child failed\n");
156 arm64_cpu_probe(device_t dev)
160 cpuid = device_get_unit(dev);
161 if (cpuid >= MAXCPU || cpuid > mp_maxid)
169 arm64_cpu_attach(device_t dev)
176 cpuid = device_get_unit(dev);
178 if (cpuid >= MAXCPU || cpuid > mp_maxid)
180 KASSERT(cpu_list[cpuid] == NULL, ("Already have cpu %u", cpuid));
182 reg = cpu_get_cpuid(dev, ®_size);
187 device_printf(dev, "register <");
188 for (i = 0; i < reg_size; i++)
189 printf("%s%x", (i == 0) ? "" : " ", reg[i]);
193 /* Set the device to start it later */
194 cpu_list[cpuid] = dev;
200 release_aps(void *dummy __unused)
204 /* Only release CPUs if they exist */
208 intr_pic_ipi_setup(IPI_AST, "ast", ipi_ast, NULL);
209 intr_pic_ipi_setup(IPI_PREEMPT, "preempt", ipi_preempt, NULL);
210 intr_pic_ipi_setup(IPI_RENDEZVOUS, "rendezvous", ipi_rendezvous, NULL);
211 intr_pic_ipi_setup(IPI_STOP, "stop", ipi_stop, NULL);
212 intr_pic_ipi_setup(IPI_STOP_HARD, "stop hard", ipi_stop, NULL);
213 intr_pic_ipi_setup(IPI_HARDCLOCK, "hardclock", ipi_hardclock, NULL);
215 atomic_store_rel_int(&aps_ready, 1);
216 /* Wake up the other CPUs */
217 __asm __volatile("sev");
219 printf("Release APs\n");
221 for (i = 0; i < 2000; i++) {
227 printf("APs not started\n");
229 SYSINIT(start_aps, SI_SUB_SMP, SI_ORDER_FIRST, release_aps, NULL);
232 init_secondary(uint64_t cpu)
236 pcpup = &__pcpu[cpu];
238 * Set the pcpu pointer with a backup in tpidr_el1 to be
239 * loaded when entering the kernel from userland.
243 "msr tpidr_el1, %0" :: "r"(pcpup));
245 /* Spin until the BSP releases the APs */
247 __asm __volatile("wfe");
249 /* Initialize curthread */
250 KASSERT(PCPU_GET(idlethread) != NULL, ("no idle thread"));
251 pcpup->pc_curthread = pcpup->pc_idlethread;
252 pcpup->pc_curpcb = pcpup->pc_idlethread->td_pcb;
255 * Identify current CPU. This is necessary to setup
256 * affinity registers and to provide support for
257 * runtime chip identification.
261 intr_pic_init_secondary();
263 /* Start per-CPU event timers. */
272 /* Enable interrupts */
275 mtx_lock_spin(&ap_boot_mtx);
277 atomic_add_rel_32(&smp_cpus, 1);
279 if (smp_cpus == mp_ncpus) {
280 /* enable IPI's, tlb shootdown, freezes etc */
281 atomic_store_rel_int(&smp_started, 1);
284 mtx_unlock_spin(&ap_boot_mtx);
286 /* Enter the scheduler */
289 panic("scheduler returned us to init_secondary");
294 * Send IPI thru interrupt controller.
297 pic_ipi_send(void *arg, cpuset_t cpus, u_int ipi)
300 KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
301 PIC_IPI_SEND(intr_irq_root_dev, arg, cpus, ipi);
305 * Setup IPI handler on interrupt controller.
310 intr_pic_ipi_setup(u_int ipi, const char *name, intr_ipi_handler_t *hand,
313 struct intr_irqsrc *isrc;
317 KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
318 KASSERT(hand != NULL, ("%s: ipi %u no handler", __func__, ipi));
320 error = PIC_IPI_SETUP(intr_irq_root_dev, ipi, &isrc);
324 isrc->isrc_handlers++;
326 ii = intr_ipi_lookup(ipi);
327 KASSERT(ii->ii_count == NULL, ("%s: ipi %u reused", __func__, ipi));
329 ii->ii_handler = hand;
330 ii->ii_handler_arg = arg;
331 ii->ii_send = pic_ipi_send;
332 ii->ii_send_arg = isrc;
333 strlcpy(ii->ii_name, name, INTR_IPI_NAMELEN);
334 ii->ii_count = intr_ipi_setup_counters(name);
338 intr_ipi_send(cpuset_t cpus, u_int ipi)
342 ii = intr_ipi_lookup(ipi);
343 if (ii->ii_count == NULL)
344 panic("%s: not setup IPI %u", __func__, ipi);
346 ii->ii_send(ii->ii_send_arg, cpus, ipi);
350 ipi_ast(void *dummy __unused)
353 CTR0(KTR_SMP, "IPI_AST");
357 ipi_hardclock(void *dummy __unused)
360 CTR1(KTR_SMP, "%s: IPI_HARDCLOCK", __func__);
365 ipi_preempt(void *dummy __unused)
367 CTR1(KTR_SMP, "%s: IPI_PREEMPT", __func__);
368 sched_preempt(curthread);
372 ipi_rendezvous(void *dummy __unused)
375 CTR0(KTR_SMP, "IPI_RENDEZVOUS");
376 smp_rendezvous_action();
380 ipi_stop(void *dummy __unused)
384 CTR0(KTR_SMP, "IPI_STOP");
386 cpu = PCPU_GET(cpuid);
387 savectx(&stoppcbs[cpu]);
389 /* Indicate we are stopped */
390 CPU_SET_ATOMIC(cpu, &stopped_cpus);
392 /* Wait for restart */
393 while (!CPU_ISSET(cpu, &started_cpus))
396 CPU_CLR_ATOMIC(cpu, &started_cpus);
397 CPU_CLR_ATOMIC(cpu, &stopped_cpus);
398 CTR0(KTR_SMP, "IPI_STOP (restart)");
405 return (smp_topo_none());
408 /* Determine if we running MP machine */
413 /* ARM64TODO: Read the u bit of mpidr_el1 to determine this */
419 cpu_init_fdt(u_int id, phandle_t node, u_int addr_size, pcell_t *reg)
427 /* Check we are able to start this cpu */
431 KASSERT(id < MAXCPU, ("Too many CPUs"));
433 /* We are already running on cpu 0 */
438 * Rotate the CPU IDs to put the boot CPU as CPU 0. We keep the other
439 * CPUs ordered as the are likely grouped into clusters so it can be
440 * useful to keep that property, e.g. for the GICv3 driver to send
441 * an IPI to all CPUs in the cluster.
445 cpuid += mp_maxid + 1;
448 pcpup = &__pcpu[cpuid];
449 pcpu_init(pcpup, cpuid, sizeof(struct pcpu));
451 dpcpu[cpuid - 1] = (void *)kmem_malloc(kernel_arena, DPCPU_SIZE,
453 dpcpu_init(dpcpu[cpuid - 1], cpuid);
456 if (addr_size == 2) {
458 target_cpu |= reg[1];
461 printf("Starting CPU %u (%lx)\n", cpuid, target_cpu);
462 pa = pmap_extract(kernel_pmap, (vm_offset_t)mpentry);
464 err = psci_cpu_on(target_cpu, pa, cpuid);
465 if (err != PSCI_RETVAL_SUCCESS) {
467 * Panic here if INVARIANTS are enabled and PSCI failed to
468 * start the requested CPU. If psci_cpu_on returns PSCI_MISSING
469 * to indicate we are unable to use it to start the given CPU.
471 KASSERT(err == PSCI_MISSING,
472 ("Failed to start CPU %u (%lx)\n", id, target_cpu));
475 kmem_free(kernel_arena, (vm_offset_t)dpcpu[cpuid - 1],
477 dpcpu[cpuid - 1] = NULL;
478 /* Notify the user that the CPU failed to start */
479 printf("Failed to start CPU %u (%lx)\n", id, target_cpu);
481 CPU_SET(cpuid, &all_cpus);
487 /* Initialize and fire up non-boot processors */
492 mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN);
494 CPU_SET(0, &all_cpus);
496 switch(arm64_bus_method) {
499 KASSERT(cpu0 >= 0, ("Current CPU was not found"));
500 ofw_cpu_early_foreach(cpu_init_fdt, true);
508 /* Introduce rest of cores to the world */
510 cpu_mp_announce(void)
516 cpu_find_cpu0_fdt(u_int id, phandle_t node, u_int addr_size, pcell_t *reg)
518 uint64_t mpidr_fdt, mpidr_reg;
522 if (addr_size == 2) {
527 mpidr_reg = READ_SPECIALREG(mpidr_el1);
529 if ((mpidr_reg & 0xff00fffffful) == mpidr_fdt)
538 cpu_mp_setmaxid(void)
543 if (arm64_bus_method == ARM64_BUS_FDT) {
544 cores = ofw_cpu_early_foreach(cpu_find_cpu0_fdt, false);
546 cores = MIN(cores, MAXCPU);
548 printf("Found %d CPUs in the device tree\n",
551 mp_maxid = cores - 1;
558 printf("No CPU data, limiting to 1 core\n");
566 static struct intr_ipi *
567 intr_ipi_lookup(u_int ipi)
570 if (ipi >= INTR_IPI_COUNT)
571 panic("%s: no such IPI %u", __func__, ipi);
573 return (&ipi_sources[ipi]);
577 * interrupt controller dispatch function for IPIs. It should
578 * be called straight from the interrupt controller, when associated
579 * interrupt source is learned. Or from anybody who has an interrupt
583 intr_ipi_dispatch(u_int ipi, struct trapframe *tf)
588 ii = intr_ipi_lookup(ipi);
589 if (ii->ii_count == NULL)
590 panic("%s: not setup IPI %u", __func__, ipi);
592 intr_ipi_increment_count(ii->ii_count, PCPU_GET(cpuid));
595 * Supply ipi filter with trapframe argument
596 * if none is registered.
598 arg = ii->ii_handler_arg != NULL ? ii->ii_handler_arg : tf;
604 * Map IPI into interrupt controller.
609 ipi_map(struct intr_irqsrc *isrc, u_int ipi)
614 if (ipi >= INTR_IPI_COUNT)
615 panic("%s: no such IPI %u", __func__, ipi);
617 KASSERT(intr_irq_root_dev != NULL, ("%s: no root attached", __func__));
619 isrc->isrc_type = INTR_ISRCT_NAMESPACE;
620 isrc->isrc_nspc_type = INTR_IRQ_NSPC_IPI;
621 isrc->isrc_nspc_num = ipi_next_num;
623 error = PIC_REGISTER(intr_irq_root_dev, isrc, &is_percpu);
625 isrc->isrc_dev = intr_irq_root_dev;
632 * Setup IPI handler to interrupt source.
634 * Note that there could be more ways how to send and receive IPIs
635 * on a platform like fast interrupts for example. In that case,
636 * one can call this function with ASIF_NOALLOC flag set and then
637 * call intr_ipi_dispatch() when appropriate.
642 intr_ipi_set_handler(u_int ipi, const char *name, intr_ipi_filter_t *filter,
643 void *arg, u_int flags)
645 struct intr_irqsrc *isrc;
651 isrc = intr_ipi_lookup(ipi);
652 if (isrc->isrc_ipifilter != NULL)
655 if ((flags & AISHF_NOALLOC) == 0) {
656 error = ipi_map(isrc, ipi);
661 isrc->isrc_ipifilter = filter;
662 isrc->isrc_arg = arg;
663 isrc->isrc_handlers = 1;
664 isrc->isrc_count = intr_ipi_setup_counters(name);
665 isrc->isrc_index = 0; /* it should not be used in IPI case */
667 if (isrc->isrc_dev != NULL) {
668 PIC_ENABLE_INTR(isrc->isrc_dev, isrc);
669 PIC_ENABLE_SOURCE(isrc->isrc_dev, isrc);
677 ipi_all_but_self(u_int ipi)
682 CPU_CLR(PCPU_GET(cpuid), &cpus);
683 CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
684 intr_ipi_send(cpus, ipi);
688 ipi_cpu(int cpu, u_int ipi)
695 CTR3(KTR_SMP, "%s: cpu: %d, ipi: %x", __func__, cpu, ipi);
696 intr_ipi_send(cpus, ipi);
700 ipi_selected(cpuset_t cpus, u_int ipi)
703 CTR2(KTR_SMP, "%s: ipi: %x", __func__, ipi);
704 intr_ipi_send(cpus, ipi);