1/* $OpenBSD: msi.c,v 1.5 2020/06/23 01:21:29 jmatthew 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 26struct msi_msg { 27 uint64_t mm_data[8]; 28}; 29 30struct msi_eq * 31msi_eq_alloc(bus_dma_tag_t t, int msi_eq_size, int num_eq) 32{ 33 struct msi_eq *meq; 34 bus_size_t eqsize, 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 eqsize = roundup(msi_eq_size * sizeof(struct msi_msg), 43 PAGE_SIZE); 44 size = num_eq * eqsize; 45 46 if (bus_dmamap_create(t, size, 1, size, 0, 47 BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &meq->meq_map) != 0) 48 return (NULL); 49 50 if (bus_dmamem_alloc(t, size, eqsize, 0, &meq->meq_seg, 1, 51 &nsegs, BUS_DMA_NOWAIT) != 0) 52 goto destroy; 53 54 if (bus_dmamem_map(t, &meq->meq_seg, 1, size, &va, 55 BUS_DMA_NOWAIT) != 0) 56 goto free; 57 58 if (bus_dmamap_load(t, meq->meq_map, va, size, NULL, 59 BUS_DMA_NOWAIT) != 0) 60 goto unmap; 61 62 meq->meq_va = va; 63 meq->meq_nentries = msi_eq_size; 64 meq->meq_queuesize = eqsize; 65 meq->meq_nqueues = num_eq; 66 return (meq); 67 68unmap: 69 bus_dmamem_unmap(t, va, size); 70free: 71 bus_dmamem_free(t, &meq->meq_seg, 1); 72destroy: 73 bus_dmamap_destroy(t, meq->meq_map); 74 75 return (NULL); 76} 77 78void 79msi_eq_free(bus_dma_tag_t t, struct msi_eq *meq) 80{ 81 bus_dmamap_unload(t, meq->meq_map); 82 bus_dmamem_unmap(t, meq->meq_va, meq->meq_nqueues * meq->meq_queuesize); 83 bus_dmamem_free(t, &meq->meq_seg, 1); 84 bus_dmamap_destroy(t, meq->meq_map); 85 free(meq, M_DEVBUF, sizeof *meq); 86} 87 88size_t 89msi_eq_offset(struct msi_eq *meq, int eq) 90{ 91 return (meq->meq_queuesize * eq); 92} 93