xref: /freebsd/sys/dev/xdma/xdma_queue.c (revision cfd6422a5217410fbd66f7a7a8a64d9d85e61229)
1 /*-
2  * Copyright (c) 2018-2019 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/malloc.h>
41 #include <sys/mutex.h>
42 
43 #include <machine/bus.h>
44 
45 #include <dev/xdma/xdma.h>
46 
47 int
48 xdma_dequeue(xdma_channel_t *xchan, void **user,
49     xdma_transfer_status_t *status)
50 {
51 	struct xdma_request *xr_tmp;
52 	struct xdma_request *xr;
53 
54 	QUEUE_OUT_LOCK(xchan);
55 	TAILQ_FOREACH_SAFE(xr, &xchan->queue_out, xr_next, xr_tmp) {
56 		TAILQ_REMOVE(&xchan->queue_out, xr, xr_next);
57 		break;
58 	}
59 	QUEUE_OUT_UNLOCK(xchan);
60 
61 	if (xr == NULL)
62 		return (-1);
63 
64 	*user = xr->user;
65 	status->error = xr->status.error;
66 	status->transferred = xr->status.transferred;
67 
68 	xchan_bank_put(xchan, xr);
69 
70 	return (0);
71 }
72 
73 int
74 xdma_enqueue(xdma_channel_t *xchan, uintptr_t src, uintptr_t dst,
75     uint8_t src_width, uint8_t dst_width, bus_size_t len,
76     enum xdma_direction dir, void *user)
77 {
78 	struct xdma_request *xr;
79 	xdma_controller_t *xdma;
80 
81 	xdma = xchan->xdma;
82 	KASSERT(xdma != NULL, ("xdma is NULL"));
83 
84 	xr = xchan_bank_get(xchan);
85 	if (xr == NULL)
86 		return (-1); /* No space is available. */
87 
88 	xr->user = user;
89 	xr->direction = dir;
90 	xr->m = NULL;
91 	xr->bp = NULL;
92 	xr->block_num = 1;
93 	xr->block_len = len;
94 	xr->req_type = XR_TYPE_VIRT;
95 	xr->src_addr = src;
96 	xr->dst_addr = dst;
97 	xr->src_width = src_width;
98 	xr->dst_width = dst_width;
99 
100 	QUEUE_IN_LOCK(xchan);
101 	TAILQ_INSERT_TAIL(&xchan->queue_in, xr, xr_next);
102 	QUEUE_IN_UNLOCK(xchan);
103 
104 	return (0);
105 }
106 
107 int
108 xdma_queue_submit(xdma_channel_t *xchan)
109 {
110 	xdma_controller_t *xdma;
111 	int ret;
112 
113 	xdma = xchan->xdma;
114 	KASSERT(xdma != NULL, ("xdma is NULL"));
115 
116 	ret = 0;
117 
118 	XCHAN_LOCK(xchan);
119 
120 	if (xchan->flags & XCHAN_TYPE_SG)
121 		ret = xdma_queue_submit_sg(xchan);
122 
123 	XCHAN_UNLOCK(xchan);
124 
125 	return (ret);
126 }
127