1/*-
2 * Copyright (c) 2017-2019 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * This software was developed by SRI International and the University of
6 * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
7 * ("CTSRD"), as part of the DARPA CRASH research programme.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD$");
33
34#include "opt_platform.h"
35#include <sys/param.h>
36#include <sys/conf.h>
37#include <sys/bus.h>
38#include <sys/kernel.h>
39#include <sys/mbuf.h>
40
41#include <machine/bus.h>
42
43#ifdef FDT
44#include <dev/fdt/fdt_common.h>
45#include <dev/ofw/ofw_bus.h>
46#include <dev/ofw/ofw_bus_subr.h>
47#endif
48
49#include <dev/xdma/xdma.h>
50
51int
52xdma_dequeue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
53    xdma_transfer_status_t *status)
54{
55	struct xdma_request *xr;
56	struct xdma_request *xr_tmp;
57
58	QUEUE_OUT_LOCK(xchan);
59	TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
60		TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
61		break;
62	}
63	QUEUE_OUT_UNLOCK(xchan);
64
65	if (xr == NULL)
66		return (-1);
67
68	*mp = xr->m;
69	status->error = xr->status.error;
70	status->transferred = xr->status.transferred;
71
72	xchan_bank_put(xchan, xr);
73
74	return (0);
75}
76
77int
78xdma_enqueue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
79    uintptr_t addr, uint8_t src_width, uint8_t dst_width,
80    enum xdma_direction dir)
81{
82	struct xdma_request *xr;
83	xdma_controller_t *xdma;
84
85	xdma = xchan->xdma;
86
87	xr = xchan_bank_get(xchan);
88	if (xr == NULL)
89		return (-1); /* No space is available yet. */
90
91	xr->direction = dir;
92	xr->m = *mp;
93	xr->req_type = XR_TYPE_MBUF;
94	if (dir == XDMA_MEM_TO_DEV) {
95		xr->dst_addr = addr;
96		xr->src_addr = 0;
97	} else {
98		xr->src_addr = addr;
99		xr->dst_addr = 0;
100	}
101	xr->src_width = src_width;
102	xr->dst_width = dst_width;
103
104	QUEUE_IN_LOCK(xchan);
105	TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
106	QUEUE_IN_UNLOCK(xchan);
107
108	return (0);
109}
110
111uint32_t
112xdma_mbuf_chain_count(struct mbuf *m0)
113{
114	struct mbuf *m;
115	uint32_t c;
116
117	c = 0;
118
119	for (m = m0; m != NULL; m = m->m_next)
120		c++;
121
122	return (c);
123}
124
125uint32_t
126xdma_mbuf_defrag(xdma_channel_t *xchan, struct xdma_request *xr)
127{
128	xdma_controller_t *xdma;
129	struct mbuf *m;
130	uint32_t c;
131
132	xdma = xchan->xdma;
133
134	c = xdma_mbuf_chain_count(xr->m);
135	if (c == 1)
136		return (c); /* Nothing to do. */
137
138	if ((m = m_defrag(xr->m, M_NOWAIT)) == NULL) {
139		device_printf(xdma->dma_dev,
140		    "%s: Can't defrag mbuf\n",
141		    __func__);
142		return (c);
143	}
144
145	xr->m = m;
146	c = 1;
147
148	return (c);
149}
150