1/*-
2 * Copyright (c) 2016 Microsoft Corp.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33
34#include <machine/bus.h>
35
36#include <dev/hyperv/include/hyperv_busdma.h>
37
38#define HYPERV_DMA_MASK	(BUS_DMA_WAITOK | BUS_DMA_NOWAIT | BUS_DMA_ZERO)
39
40void
41hyperv_dma_map_paddr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
42{
43	bus_addr_t *paddr = arg;
44
45	if (error)
46		return;
47
48	KASSERT(nseg == 1, ("too many segments %d!", nseg));
49	*paddr = segs->ds_addr;
50}
51
52void *
53hyperv_dmamem_alloc(bus_dma_tag_t parent_dtag, bus_size_t alignment,
54    bus_addr_t boundary, bus_size_t size, struct hyperv_dma *dma, int flags)
55{
56	void *ret;
57	int error;
58
59	error = bus_dma_tag_create(parent_dtag, /* parent */
60	    alignment,		/* alignment */
61	    boundary,		/* boundary */
62	    BUS_SPACE_MAXADDR,	/* lowaddr */
63	    BUS_SPACE_MAXADDR,	/* highaddr */
64	    NULL, NULL,		/* filter, filterarg */
65	    size,		/* maxsize */
66	    1,			/* nsegments */
67	    size,		/* maxsegsize */
68	    0,			/* flags */
69	    NULL,		/* lockfunc */
70	    NULL,		/* lockfuncarg */
71	    &dma->hv_dtag);
72	if (error)
73		return NULL;
74
75	error = bus_dmamem_alloc(dma->hv_dtag, &ret,
76	    (flags & HYPERV_DMA_MASK) | BUS_DMA_COHERENT, &dma->hv_dmap);
77	if (error) {
78		bus_dma_tag_destroy(dma->hv_dtag);
79		return NULL;
80	}
81
82	error = bus_dmamap_load(dma->hv_dtag, dma->hv_dmap, ret, size,
83	    hyperv_dma_map_paddr, &dma->hv_paddr, BUS_DMA_NOWAIT);
84	if (error) {
85		bus_dmamem_free(dma->hv_dtag, ret, dma->hv_dmap);
86		bus_dma_tag_destroy(dma->hv_dtag);
87		return NULL;
88	}
89	return ret;
90}
91
92void
93hyperv_dmamem_free(struct hyperv_dma *dma, void *ptr)
94{
95	bus_dmamap_unload(dma->hv_dtag, dma->hv_dmap);
96	bus_dmamem_free(dma->hv_dtag, ptr, dma->hv_dmap);
97	bus_dma_tag_destroy(dma->hv_dtag);
98}
99