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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2021-2022 Tino Reichardt <milky-zfs@mcmilk.de>
*/
#include <sys/zfs_context.h>
#include <sys/zio_checksum.h>
#include "blake3_impl.h"
static const blake3_impl_ops_t *const blake3_impls[] = {
&blake3_generic_impl,
#if defined(__aarch64__) || \
(defined(__x86_64) && defined(HAVE_SSE2)) || \
(defined(__PPC64__) && defined(__LITTLE_ENDIAN__))
&blake3_sse2_impl,
#endif
#if defined(__aarch64__) || \
(defined(__x86_64) && defined(HAVE_SSE4_1)) || \
(defined(__PPC64__) && defined(__LITTLE_ENDIAN__))
&blake3_sse41_impl,
#endif
#if defined(__x86_64) && defined(HAVE_SSE4_1) && defined(HAVE_AVX2)
&blake3_avx2_impl,
#endif
#if defined(__x86_64) && defined(HAVE_AVX512F) && defined(HAVE_AVX512VL)
&blake3_avx512_impl,
#endif
};
/* this pointer holds current ops for implementation */
static const blake3_impl_ops_t *blake3_selected_impl = &blake3_generic_impl;
/* special implementation selections */
#define IMPL_FASTEST (UINT32_MAX)
#define IMPL_CYCLE (UINT32_MAX-1)
#define IMPL_USER (UINT32_MAX-2)
#define IMPL_PARAM (UINT32_MAX-3)
#define IMPL_READ(i) (*(volatile uint32_t *) &(i))
static uint32_t icp_blake3_impl = IMPL_FASTEST;
#define BLAKE3_IMPL_NAME_MAX 16
/* id of fastest implementation */
static uint32_t blake3_fastest_id = 0;
/* currently used id */
static uint32_t blake3_current_id = 0;
/* id of module parameter (-1 == unused) */
static int blake3_param_id = -1;
/* return number of supported implementations */
int
blake3_get_impl_count(void)
{
static int impls = 0;
int i;
if (impls)
return (impls);
for (i = 0; i < ARRAY_SIZE(blake3_impls); i++) {
if (!blake3_impls[i]->is_supported()) continue;
impls++;
}
return (impls);
}
/* return id of selected implementation */
int
blake3_get_impl_id(void)
{
return (blake3_current_id);
}
/* return name of selected implementation */
const char *
blake3_get_impl_name(void)
{
return (blake3_selected_impl->name);
}
/* setup id as fastest implementation */
void
blake3_set_impl_fastest(uint32_t id)
{
blake3_fastest_id = id;
}
/* set implementation by id */
void
blake3_set_impl_id(uint32_t id)
{
int i, cid;
/* select fastest */
if (id == IMPL_FASTEST)
id = blake3_fastest_id;
/* select next or first */
if (id == IMPL_CYCLE)
id = (++blake3_current_id) % blake3_get_impl_count();
/* 0..N for the real impl */
for (i = 0, cid = 0; i < ARRAY_SIZE(blake3_impls); i++) {
if (!blake3_impls[i]->is_supported()) continue;
if (cid == id) {
blake3_current_id = cid;
blake3_selected_impl = blake3_impls[i];
return;
}
cid++;
}
}
/* set implementation by name */
int
blake3_set_impl_name(const char *name)
{
int i, cid;
if (strcmp(name, "fastest") == 0) {
atomic_swap_32(&icp_blake3_impl, IMPL_FASTEST);
blake3_set_impl_id(IMPL_FASTEST);
return (0);
} else if (strcmp(name, "cycle") == 0) {
atomic_swap_32(&icp_blake3_impl, IMPL_CYCLE);
blake3_set_impl_id(IMPL_CYCLE);
return (0);
}
for (i = 0, cid = 0; i < ARRAY_SIZE(blake3_impls); i++) {
if (!blake3_impls[i]->is_supported()) continue;
if (strcmp(name, blake3_impls[i]->name) == 0) {
if (icp_blake3_impl == IMPL_PARAM) {
blake3_param_id = cid;
return (0);
}
blake3_selected_impl = blake3_impls[i];
blake3_current_id = cid;
return (0);
}
cid++;
}
return (-EINVAL);
}
/* setup implementation */
void
blake3_setup_impl(void)
{
switch (IMPL_READ(icp_blake3_impl)) {
case IMPL_PARAM:
blake3_set_impl_id(blake3_param_id);
atomic_swap_32(&icp_blake3_impl, IMPL_USER);
break;
case IMPL_FASTEST:
blake3_set_impl_id(IMPL_FASTEST);
break;
case IMPL_CYCLE:
blake3_set_impl_id(IMPL_CYCLE);
break;
default:
blake3_set_impl_id(blake3_current_id);
break;
}
}
/* return selected implementation */
const blake3_impl_ops_t *
blake3_impl_get_ops(void)
{
/* each call to ops will cycle */
if (icp_blake3_impl == IMPL_CYCLE)
blake3_set_impl_id(IMPL_CYCLE);
return (blake3_selected_impl);
}
#if defined(_KERNEL)
void **blake3_per_cpu_ctx;
void
blake3_per_cpu_ctx_init(void)
{
/*
* Create "The Godfather" ptr to hold all blake3 ctx
*/
blake3_per_cpu_ctx = kmem_alloc(max_ncpus * sizeof (void *), KM_SLEEP);
for (int i = 0; i < max_ncpus; i++) {
blake3_per_cpu_ctx[i] = kmem_alloc(sizeof (BLAKE3_CTX),
KM_SLEEP);
}
}
void
blake3_per_cpu_ctx_fini(void)
{
for (int i = 0; i < max_ncpus; i++) {
memset(blake3_per_cpu_ctx[i], 0, sizeof (BLAKE3_CTX));
kmem_free(blake3_per_cpu_ctx[i], sizeof (BLAKE3_CTX));
}
memset(blake3_per_cpu_ctx, 0, max_ncpus * sizeof (void *));
kmem_free(blake3_per_cpu_ctx, max_ncpus * sizeof (void *));
}
#endif
#if defined(_KERNEL) && defined(__linux__)
static int
icp_blake3_impl_set(const char *name, zfs_kernel_param_t *kp)
{
char req_name[BLAKE3_IMPL_NAME_MAX];
size_t i;
/* sanitize input */
i = strnlen(name, BLAKE3_IMPL_NAME_MAX);
if (i == 0 || i >= BLAKE3_IMPL_NAME_MAX)
return (-EINVAL);
strlcpy(req_name, name, BLAKE3_IMPL_NAME_MAX);
while (i > 0 && isspace(req_name[i-1]))
i--;
req_name[i] = '\0';
atomic_swap_32(&icp_blake3_impl, IMPL_PARAM);
return (blake3_set_impl_name(req_name));
}
static int
icp_blake3_impl_get(char *buffer, zfs_kernel_param_t *kp)
{
int i, cid, cnt = 0;
char *fmt;
/* cycling */
fmt = (icp_blake3_impl == IMPL_CYCLE) ? "[cycle] " : "cycle ";
cnt += sprintf(buffer + cnt, fmt);
/* fastest one */
fmt = (icp_blake3_impl == IMPL_FASTEST) ? "[fastest] " : "fastest ";
cnt += sprintf(buffer + cnt, fmt);
/* user selected */
for (i = 0, cid = 0; i < ARRAY_SIZE(blake3_impls); i++) {
if (!blake3_impls[i]->is_supported()) continue;
fmt = (icp_blake3_impl == IMPL_USER &&
cid == blake3_current_id) ? "[%s] " : "%s ";
cnt += sprintf(buffer + cnt, fmt, blake3_impls[i]->name);
cid++;
}
buffer[cnt] = 0;
return (cnt);
}
module_param_call(icp_blake3_impl, icp_blake3_impl_set, icp_blake3_impl_get,
NULL, 0644);
MODULE_PARM_DESC(icp_blake3_impl, "Select BLAKE3 implementation.");
#endif
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