1 /* $OpenBSD: msi.c,v 1.1 2011/07/06 05:35:53 kettenis Exp $ */ 2 /* 3 * Copyright (c) 2011 Mark Kettenis <kettenis@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/param.h> 19 #include <sys/device.h> 20 #include <sys/malloc.h> 21 22 #include <machine/bus.h> 23 24 #include <sparc64/dev/msivar.h> 25 26 struct msi_msg { 27 uint64_t mm_data[8]; 28 }; 29 30 struct msi_eq * 31 msi_eq_alloc(bus_dma_tag_t t, int msi_eq_size) 32 { 33 struct msi_eq *meq; 34 bus_size_t size; 35 caddr_t va; 36 int nsegs; 37 38 meq = malloc(sizeof(struct msi_eq), M_DEVBUF, M_NOWAIT); 39 if (meq == NULL) 40 return NULL; 41 42 size = roundup(msi_eq_size * sizeof(struct msi_msg), PAGE_SIZE); 43 44 if (bus_dmamap_create(t, size, 1, size, 0, 45 BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &meq->meq_map) != 0) 46 return (NULL); 47 48 if (bus_dmamem_alloc(t, size, PAGE_SIZE, 0, &meq->meq_seg, 1, 49 &nsegs, BUS_DMA_NOWAIT) != 0) 50 goto destroy; 51 52 if (bus_dmamem_map(t, &meq->meq_seg, 1, size, &va, 53 BUS_DMA_NOWAIT) != 0) 54 goto free; 55 56 if (bus_dmamap_load(t, meq->meq_map, va, size, NULL, 57 BUS_DMA_NOWAIT) != 0) 58 goto unmap; 59 60 meq->meq_va = va; 61 meq->meq_nentries = msi_eq_size; 62 return (meq); 63 64 unmap: 65 bus_dmamem_unmap(t, va, size); 66 free: 67 bus_dmamem_free(t, &meq->meq_seg, 1); 68 destroy: 69 bus_dmamap_destroy(t, meq->meq_map); 70 71 return (NULL); 72 } 73 74 void 75 msi_eq_free(bus_dma_tag_t t, struct msi_eq *meq) 76 { 77 bus_size_t size; 78 79 size = roundup(meq->meq_nentries * sizeof(struct msi_msg), PAGE_SIZE); 80 81 bus_dmamap_unload(t, meq->meq_map); 82 bus_dmamem_unmap(t, meq->meq_va, size); 83 bus_dmamem_free(t, &meq->meq_seg, 1); 84 bus_dmamap_destroy(t, meq->meq_map); 85 free(meq, M_DEVBUF); 86 } 87