[src/trunk]: src/sys/crypto/cprng_fast Count cprng_fast reseed events.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/05ae9d3dd7e3
branches:  trunk
changeset: 1009658:05ae9d3dd7e3
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Thu Apr 30 03:29:45 2020 +0000

description:
Count cprng_fast reseed events.

diffstat:

 sys/crypto/cprng_fast/cprng_fast.c |  19 ++++++++++++++-----
 1 files changed, 14 insertions(+), 5 deletions(-)

diffs (74 lines):

diff -r c5d080c4e490 -r 05ae9d3dd7e3 sys/crypto/cprng_fast/cprng_fast.c
--- a/sys/crypto/cprng_fast/cprng_fast.c        Thu Apr 30 03:29:35 2020 +0000
+++ b/sys/crypto/cprng_fast/cprng_fast.c        Thu Apr 30 03:29:45 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: cprng_fast.c,v 1.14 2020/04/30 03:29:35 riastradh Exp $        */
+/*     $NetBSD: cprng_fast.c,v 1.15 2020/04/30 03:29:45 riastradh Exp $        */
 
 /*-
  * Copyright (c) 2014 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.14 2020/04/30 03:29:35 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: cprng_fast.c,v 1.15 2020/04/30 03:29:45 riastradh Exp $");
 
 #include <sys/types.h>
 #include <sys/param.h>
@@ -38,7 +38,9 @@
 #include <sys/cprng.h>
 #include <sys/cpu.h>
 #include <sys/entropy.h>
+#include <sys/evcnt.h>
 #include <sys/intr.h>
+#include <sys/kmem.h>
 #include <sys/percpu.h>
 
 /* ChaCha core */
@@ -198,6 +200,7 @@
        uint32_t        buffer[crypto_core_OUTPUTWORDS];
        uint32_t        key[crypto_core_KEYWORDS];
        uint32_t        nonce[crypto_core_INPUTWORDS];
+       struct evcnt    *reseed_evcnt;
        unsigned        epoch;
 };
 
@@ -221,14 +224,14 @@
 {
 
        crypto_core_selftest();
-       cprng_fast_percpu = percpu_alloc(sizeof(struct cprng_fast));
-       percpu_foreach(cprng_fast_percpu, &cprng_fast_init_cpu, NULL);
+       cprng_fast_percpu = percpu_create(sizeof(struct cprng_fast),
+           cprng_fast_init_cpu, NULL, NULL);
        cprng_fast_softint = softint_establish(SOFTINT_SERIAL|SOFTINT_MPSAFE,
            &cprng_fast_intr, NULL);
 }
 
 static void
-cprng_fast_init_cpu(void *p, void *arg __unused, struct cpu_info *ci __unused)
+cprng_fast_init_cpu(void *p, void *arg __unused, struct cpu_info *ci)
 {
        struct cprng_fast *const cprng = p;
        uint8_t seed[CPRNG_FAST_SEED_BYTES];
@@ -237,6 +240,11 @@
        cprng_strong(kern_cprng, seed, sizeof seed, 0);
        cprng_fast_seed(cprng, seed);
        (void)explicit_memset(seed, 0, sizeof seed);
+
+       cprng->reseed_evcnt = kmem_alloc(sizeof(*cprng->reseed_evcnt),
+           KM_SLEEP);
+       evcnt_attach_dynamic(cprng->reseed_evcnt, EVCNT_TYPE_MISC, NULL,
+           ci->ci_cpuname, "cprng_fast reseed");
 }
 
 static inline int
@@ -285,6 +293,7 @@
        s = splvm();
        cprng_fast_seed(cprng, seed);
        cprng->epoch = epoch;
+       cprng->reseed_evcnt->ev_count++;
        splx(s);
        percpu_putref(cprng_fast_percpu);