2 * Copyright (c) 2016 Microsoft Corp.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
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.
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.
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
34 #include <machine/bus.h>
36 #include <dev/hyperv/include/hyperv_busdma.h>
38 #define HYPERV_DMA_MASK (BUS_DMA_WAITOK | BUS_DMA_NOWAIT | BUS_DMA_ZERO)
41 hyperv_dma_map_paddr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
43 bus_addr_t *paddr = arg;
48 KASSERT(nseg == 1, ("too many segments %d!", nseg));
49 *paddr = segs->ds_addr;
53 hyperv_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)
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 */
67 size, /* maxsegsize */
70 NULL, /* lockfuncarg */
75 error = bus_dmamem_alloc(dma->hv_dtag, &ret,
76 (flags & HYPERV_DMA_MASK) | BUS_DMA_COHERENT, &dma->hv_dmap);
78 bus_dma_tag_destroy(dma->hv_dtag);
82 error = bus_dmamap_load(dma->hv_dtag, dma->hv_dmap, ret, size,
83 hyperv_dma_map_paddr, &dma->hv_paddr, BUS_DMA_NOWAIT);
85 bus_dmamem_free(dma->hv_dtag, ret, dma->hv_dmap);
86 bus_dma_tag_destroy(dma->hv_dtag);
93 hyperv_dmamem_free(struct hyperv_dma *dma, void *ptr)
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);