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 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/bus.h>
31
32 #include <machine/bus.h>
33
34 #include <dev/hyperv/include/hyperv_busdma.h>
35
36 #define HYPERV_DMA_MASK (BUS_DMA_WAITOK | BUS_DMA_NOWAIT | BUS_DMA_ZERO)
37
38 void
hyperv_dma_map_paddr(void * arg,bus_dma_segment_t * segs,int nseg,int error)39 hyperv_dma_map_paddr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
40 {
41 bus_addr_t *paddr = arg;
42
43 if (error)
44 return;
45
46 KASSERT(nseg == 1, ("too many segments %d!", nseg));
47 *paddr = segs->ds_addr;
48 }
49
50 void *
hyperv_dmamem_alloc(bus_dma_tag_t parent_dtag,bus_size_t alignment,bus_addr_t boundary,bus_size_t size,struct hyperv_dma * dma,int flags)51 hyperv_dmamem_alloc(bus_dma_tag_t parent_dtag, bus_size_t alignment,
52 bus_addr_t boundary, bus_size_t size, struct hyperv_dma *dma, int flags)
53 {
54 void *ret;
55 int error;
56
57 error = bus_dma_tag_create(parent_dtag, /* parent */
58 alignment, /* alignment */
59 boundary, /* boundary */
60 BUS_SPACE_MAXADDR, /* lowaddr */
61 BUS_SPACE_MAXADDR, /* highaddr */
62 NULL, NULL, /* filter, filterarg */
63 size, /* maxsize */
64 1, /* nsegments */
65 size, /* maxsegsize */
66 0, /* flags */
67 NULL, /* lockfunc */
68 NULL, /* lockfuncarg */
69 &dma->hv_dtag);
70 if (error)
71 return NULL;
72
73 error = bus_dmamem_alloc(dma->hv_dtag, &ret,
74 (flags & HYPERV_DMA_MASK) | BUS_DMA_COHERENT, &dma->hv_dmap);
75 if (error) {
76 bus_dma_tag_destroy(dma->hv_dtag);
77 return NULL;
78 }
79
80 error = bus_dmamap_load(dma->hv_dtag, dma->hv_dmap, ret, size,
81 hyperv_dma_map_paddr, &dma->hv_paddr, BUS_DMA_NOWAIT);
82 if (error) {
83 bus_dmamem_free(dma->hv_dtag, ret, dma->hv_dmap);
84 bus_dma_tag_destroy(dma->hv_dtag);
85 return NULL;
86 }
87 return ret;
88 }
89
90 void
hyperv_dmamem_free(struct hyperv_dma * dma,void * ptr)91 hyperv_dmamem_free(struct hyperv_dma *dma, void *ptr)
92 {
93 bus_dmamap_unload(dma->hv_dtag, dma->hv_dmap);
94 bus_dmamem_free(dma->hv_dtag, ptr, dma->hv_dmap);
95 bus_dma_tag_destroy(dma->hv_dtag);
96 }
97