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/lock.h>
40#include <sys/mbuf.h>
41#include <sys/mutex.h>
42
43#include <machine/bus.h>
44
45#ifdef FDT
46#include <dev/fdt/fdt_common.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49#endif
50
51#include <dev/xdma/xdma.h>
52
53int
54xdma_dequeue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
55    xdma_transfer_status_t *status)
56{
57	struct xdma_request *xr;
58	struct xdma_request *xr_tmp;
59
60	QUEUE_OUT_LOCK(xchan);
61	TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
62		TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
63		break;
64	}
65	QUEUE_OUT_UNLOCK(xchan);
66
67	if (xr == NULL)
68		return (-1);
69
70	*mp = xr->m;
71	status->error = xr->status.error;
72	status->transferred = xr->status.transferred;
73
74	xchan_bank_put(xchan, xr);
75
76	return (0);
77}
78
79int
80xdma_enqueue_mbuf(xdma_channel_t *xchan, struct mbuf **mp,
81    uintptr_t addr, uint8_t src_width, uint8_t dst_width,
82    enum xdma_direction dir)
83{
84	struct xdma_request *xr;
85	xdma_controller_t *xdma;
86
87	xdma = xchan->xdma;
88
89	xr = xchan_bank_get(xchan);
90	if (xr == NULL)
91		return (-1); /* No space is available yet. */
92
93	xr->direction = dir;
94	xr->m = *mp;
95	xr->req_type = XR_TYPE_MBUF;
96	if (dir == XDMA_MEM_TO_DEV) {
97		xr->dst_addr = addr;
98		xr->src_addr = 0;
99	} else {
100		xr->src_addr = addr;
101		xr->dst_addr = 0;
102	}
103	xr->src_width = src_width;
104	xr->dst_width = dst_width;
105
106	QUEUE_IN_LOCK(xchan);
107	TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
108	QUEUE_IN_UNLOCK(xchan);
109
110	return (0);
111}
112
113uint32_t
114xdma_mbuf_chain_count(struct mbuf *m0)
115{
116	struct mbuf *m;
117	uint32_t c;
118
119	c = 0;
120
121	for (m = m0; m != NULL; m = m->m_next)
122		c++;
123
124	return (c);
125}
126
127uint32_t
128xdma_mbuf_defrag(xdma_channel_t *xchan, struct xdma_request *xr)
129{
130	xdma_controller_t *xdma;
131	struct mbuf *m;
132	uint32_t c;
133
134	xdma = xchan->xdma;
135
136	c = xdma_mbuf_chain_count(xr->m);
137	if (c == 1)
138		return (c); /* Nothing to do. */
139
140	if ((m = m_defrag(xr->m, M_NOWAIT)) == NULL) {
141		device_printf(xdma->dma_dev,
142		    "%s: Can't defrag mbuf\n",
143		    __func__);
144		return (c);
145	}
146
147	xr->m = m;
148	c = 1;
149
150	return (c);
151}
152