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/param.h> 28 #include <sys/systm.h> 29 #include <sys/bus.h> 30 31 #include <dev/virtual/hyperv/hyperv_busdma.h> 32 33 void 34 hyperv_dma_map_paddr(void *arg, bus_dma_segment_t *segs, int nseg, int error) 35 { 36 bus_addr_t *paddr = arg; 37 38 if (error) 39 return; 40 41 KASSERT(nseg == 1, ("too many segments %d!", nseg)); 42 *paddr = segs->ds_addr; 43 } 44 45 void * 46 hyperv_dmamem_alloc(bus_dma_tag_t parent_dtag, bus_size_t alignment, 47 bus_addr_t boundary, bus_size_t size, struct hyperv_dma *dma, int flags) 48 { 49 bus_dmamem_t dmem; 50 int error; 51 52 error = bus_dmamem_coherent(parent_dtag, alignment, boundary, 53 BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR, size, flags, &dmem); 54 if (error) 55 return NULL; 56 57 dma->hv_dtag = dmem.dmem_tag; 58 dma->hv_dmap = dmem.dmem_map; 59 dma->hv_paddr = dmem.dmem_busaddr; 60 return dmem.dmem_addr; 61 } 62 63 void 64 hyperv_dmamem_free(struct hyperv_dma *dma, void *ptr) 65 { 66 bus_dmamap_unload(dma->hv_dtag, dma->hv_dmap); 67 bus_dmamem_free(dma->hv_dtag, ptr, dma->hv_dmap); 68 bus_dma_tag_destroy(dma->hv_dtag); 69 } 70