1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33#include <sys/bus.h>
34#include <sys/malloc.h>
35#include <sys/sysctl.h>
36
37#include <opencrypto/xform.h>
38
39#include "ccp.h"
40#include "ccp_lsb.h"
41
42void
43ccp_queue_decode_lsb_regions(struct ccp_softc *sc, uint64_t lsbmask,
44    unsigned queue)
45{
46	struct ccp_queue *qp;
47	unsigned i;
48
49	qp = &sc->queues[queue];
50
51	qp->lsb_mask = 0;
52
53	for (i = 0; i < MAX_LSB_REGIONS; i++) {
54		if (((1 << queue) & lsbmask) != 0)
55			qp->lsb_mask |= (1 << i);
56		lsbmask >>= MAX_HW_QUEUES;
57	}
58
59	/*
60	 * Ignore region 0, which has special entries that cannot be used
61	 * generally.
62	 */
63	qp->lsb_mask &= ~(1 << 0);
64}
65
66/*
67 * Look for a private LSB for each queue.  There are 7 general purpose LSBs
68 * total and 5 queues.  PSP will reserve some of both.  Firmware limits some
69 * queues' access to some LSBs; we hope it is fairly sane and just use a dumb
70 * greedy algorithm to assign LSBs to queues.
71 */
72void
73ccp_assign_lsb_regions(struct ccp_softc *sc, uint64_t lsbmask)
74{
75	unsigned q, i;
76
77	for (q = 0; q < nitems(sc->queues); q++) {
78		if (((1 << q) & sc->valid_queues) == 0)
79			continue;
80
81		sc->queues[q].private_lsb = -1;
82
83		/* Intentionally skip specialized 0th LSB */
84		for (i = 1; i < MAX_LSB_REGIONS; i++) {
85			if ((lsbmask &
86			    (1ull << (q + (MAX_HW_QUEUES * i)))) != 0) {
87				sc->queues[q].private_lsb = i;
88				lsbmask &= ~(0x1Full << (MAX_HW_QUEUES * i));
89				break;
90			}
91		}
92
93		if (i == MAX_LSB_REGIONS) {
94			device_printf(sc->dev,
95			    "Ignoring queue %u with no private LSB\n", q);
96			sc->valid_queues &= ~(1 << q);
97		}
98	}
99}
100