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Diffstat (limited to 'sys/kern/subr_pcpu.c')
| -rw-r--r-- | sys/kern/subr_pcpu.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/sys/kern/subr_pcpu.c b/sys/kern/subr_pcpu.c new file mode 100644 index 0000000..132e957 --- /dev/null +++ b/sys/kern/subr_pcpu.c @@ -0,0 +1,144 @@ +/* + * Copyright (c) 2001 Wind River Systems, Inc. + * All rights reserved. + * Written by: John Baldwin <jhb@FreeBSD.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +/* + * This module provides MI support for per-cpu data. + * + * Each architecture determines the mapping of logical CPU IDs to physical + * CPUs. The requirements of this mapping are as follows: + * - Logical CPU IDs must reside in the range 0 ... MAXCPU - 1. + * - The mapping is not required to be dense. That is, there may be + * gaps in the mappings. + * - The platform sets the value of MAXCPU in <machine/param.h>. + * - It is suggested, but not required, that in the non-SMP case, the + * platform define MAXCPU to be 1 and define the logical ID of the + * sole CPU as 0. + */ + +#include "opt_ddb.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/linker_set.h> +#include <sys/lock.h> +#include <sys/pcpu.h> +#include <sys/proc.h> +#include <ddb/ddb.h> + +static struct pcpu *cpuid_to_pcpu[MAXCPU]; +struct cpuhead cpuhead = SLIST_HEAD_INITIALIZER(cpuhead); + +/* + * Initialize the MI portions of a struct pcpu. + */ +void +pcpu_init(struct pcpu *pcpu, int cpuid, size_t size) +{ + + bzero(pcpu, size); + KASSERT(cpuid >= 0 && cpuid < MAXCPU, + ("pcpu_init: invalid cpuid %d", cpuid)); + pcpu->pc_cpuid = cpuid; + pcpu->pc_cpumask = 1 << cpuid; + cpuid_to_pcpu[cpuid] = pcpu; + SLIST_INSERT_HEAD(&cpuhead, pcpu, pc_allcpu); + cpu_pcpu_init(pcpu, cpuid, size); +} + +/* + * Destroy a struct pcpu. + */ +void +pcpu_destroy(struct pcpu *pcpu) +{ + + SLIST_REMOVE(&cpuhead, pcpu, pcpu, pc_allcpu); + cpuid_to_pcpu[pcpu->pc_cpuid] = NULL; +} + +/* + * Locate a struct pcpu by cpu id. + */ +struct pcpu * +pcpu_find(u_int cpuid) +{ + + return (cpuid_to_pcpu[cpuid]); +} + +#ifdef DDB +DB_SHOW_COMMAND(pcpu, db_show_pcpu) +{ + struct pcpu *pc; + struct thread *td; + int id; + + if (have_addr) + id = ((addr >> 4) % 16) * 10 + (addr % 16); + else + id = PCPU_GET(cpuid); + pc = pcpu_find(id); + if (pc == NULL) { + db_printf("CPU %d not found\n", id); + return; + } + db_printf("cpuid = %d\n", pc->pc_cpuid); + db_printf("curthread = "); + td = pc->pc_curthread; + if (td != NULL) + db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, + td->td_proc->p_comm); + else + db_printf("none\n"); + db_printf("curpcb = %p\n", pc->pc_curpcb); + db_printf("fpcurthread = "); + td = pc->pc_fpcurthread; + if (td != NULL) + db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, + td->td_proc->p_comm); + else + db_printf("none\n"); + db_printf("idlethread = "); + td = pc->pc_idlethread; + if (td != NULL) + db_printf("%p: pid %d \"%s\"\n", td, td->td_proc->p_pid, + td->td_proc->p_comm); + else + db_printf("none\n"); + db_show_mdpcpu(pc); + +#ifdef WITNESS + db_printf("spin locks held:\n"); + witness_list_locks(&pc->pc_spinlocks); +#endif +} +#endif |
