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entropy(9): Create per-CPU state earlier. 

This will make it possible to use it from interrupts as soon as they
start, which means the global entropy pool lock won't have to block
interrupts.
This commit is contained in:
riastradh 2022-03-18 23:34:44 +00:00
parent a9f92eb79d
commit 0107837f03
1 changed files with 9 additions and 7 deletions
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16
sys/kern/kern_entropy.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_entropy.c,v 1.35 2022/03/16 23:56:55 riastradh Exp $ */
/* $NetBSD: kern_entropy.c,v 1.36 2022/03/18 23:34:44 riastradh Exp $ */
/*-
* Copyright (c) 2019 The NetBSD Foundation, Inc.
@ -75,7 +75,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_entropy.c,v 1.35 2022/03/16 23:56:55 riastradh Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_entropy.c,v 1.36 2022/03/18 23:34:44 riastradh Exp $");
#include <sys/param.h>
#include <sys/types.h>
@ -382,6 +382,10 @@ entropy_init(void)
LIST_FOREACH(rs, &E->sources, list)
rs->state = percpu_alloc(sizeof(struct rndsource_cpu));
/* Allocate and initialize the per-CPU state. */
entropy_percpu = percpu_create(sizeof(struct entropy_cpu),
entropy_init_cpu, entropy_fini_cpu, NULL);
/* Enter the boot cycle count to get started. */
extra[i++] = entropy_timer();
KASSERT(i == __arraycount(extra));
@ -406,10 +410,6 @@ entropy_init_late(void)
KASSERT(E->stage == ENTROPY_WARM);
/* Allocate and initialize the per-CPU state. */
entropy_percpu = percpu_create(sizeof(struct entropy_cpu),
entropy_init_cpu, entropy_fini_cpu, NULL);
/*
* Establish the softint at the highest softint priority level.
* Must happen after CPU detection.
@ -453,8 +453,10 @@ entropy_init_cpu(void *ptr, void *cookie, struct cpu_info *ci)
ec->ec_pending = 0;
ec->ec_locked = false;
/* XXX ci_cpuname may not be initialized early enough. */
evcnt_attach_dynamic(ec->ec_softint_evcnt, EVCNT_TYPE_MISC, NULL,
ci->ci_cpuname, "entropy softint");
ci->ci_cpuname[0] == '\0' ? "cpu0" : ci->ci_cpuname,
"entropy softint");
}
/*