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 40 void 41 hyperv_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 52 void * 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) 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 92 void 93 hyperv_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