1 /* $NetBSD: hyperv_common.c,v 1.6 2022/05/20 13:55:17 nonaka Exp $ */
2
3 /*-
4 * Copyright (c) 2009-2012,2016-2017 Microsoft Corp.
5 * Copyright (c) 2012 NetApp Inc.
6 * Copyright (c) 2012 Citrix Inc.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
14 * disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: hyperv_common.c,v 1.6 2022/05/20 13:55:17 nonaka Exp $");
33
34 #include "hyperv.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/bus.h>
40 #include <sys/kmem.h>
41
42 #include <dev/hyperv/hypervreg.h>
43 #include <dev/hyperv/hypervvar.h>
44
45 u_int hyperv_ver_major;
46 hyperv_tc64_t hyperv_tc64;
47
48 int hyperv_nullop(void);
49 void hyperv_voidop(void);
50 uint64_t hyperv_hypercall_error(uint64_t, paddr_t, paddr_t);
51
52 __weak_alias(hyperv_hypercall, hyperv_hypercall_error);
53 __weak_alias(hyperv_hypercall_enabled, hyperv_nullop);
54 __weak_alias(hyperv_synic_supported, hyperv_nullop);
55 __weak_alias(hyperv_is_gen1, hyperv_nullop);
56 __weak_alias(hyperv_set_event_proc, hyperv_voidop);
57 __weak_alias(hyperv_set_message_proc, hyperv_voidop);
58 __weak_alias(hyperv_send_eom, hyperv_voidop);
59 __weak_alias(hyperv_intr, hyperv_voidop);
60 __weak_alias(hyperv_get_vcpuid, hyperv_nullop);
61 __weak_alias(vmbus_init_interrupts_md, hyperv_voidop);
62 __weak_alias(vmbus_deinit_interrupts_md, hyperv_voidop);
63 __weak_alias(vmbus_init_synic_md, hyperv_voidop);
64 __weak_alias(vmbus_deinit_synic_md, hyperv_voidop);
65
66 int
hyperv_nullop(void)67 hyperv_nullop(void)
68 {
69 return 0;
70 }
71
72 void
hyperv_voidop(void)73 hyperv_voidop(void)
74 {
75 }
76
77 uint64_t
hyperv_hypercall_error(uint64_t control,paddr_t in_paddr,paddr_t out_paddr)78 hyperv_hypercall_error(uint64_t control, paddr_t in_paddr, paddr_t out_paddr)
79 {
80 return ~HYPERCALL_STATUS_SUCCESS;
81 }
82
83 uint64_t
hyperv_hypercall_post_message(paddr_t msg)84 hyperv_hypercall_post_message(paddr_t msg)
85 {
86
87 return hyperv_hypercall(HYPERCALL_POST_MESSAGE, msg, 0);
88 }
89
90 uint64_t
hyperv_hypercall_signal_event(paddr_t monprm)91 hyperv_hypercall_signal_event(paddr_t monprm)
92 {
93
94 return hyperv_hypercall(HYPERCALL_SIGNAL_EVENT, monprm, 0);
95 }
96
97 int
hyperv_guid2str(const struct hyperv_guid * guid,char * buf,size_t sz)98 hyperv_guid2str(const struct hyperv_guid *guid, char *buf, size_t sz)
99 {
100 const uint8_t *d = guid->hv_guid;
101
102 return snprintf(buf, sz, "%02x%02x%02x%02x-"
103 "%02x%02x-%02x%02x-%02x%02x-"
104 "%02x%02x%02x%02x%02x%02x",
105 d[3], d[2], d[1], d[0],
106 d[5], d[4], d[7], d[6], d[8], d[9],
107 d[10], d[11], d[12], d[13], d[14], d[15]);
108 }
109
110 /*
111 * Hyper-V bus_dma utilities.
112 */
113 void *
hyperv_dma_alloc(bus_dma_tag_t dmat,struct hyperv_dma * dma,bus_size_t size,bus_size_t alignment,bus_size_t boundary,int nsegs)114 hyperv_dma_alloc(bus_dma_tag_t dmat, struct hyperv_dma *dma, bus_size_t size,
115 bus_size_t alignment, bus_size_t boundary, int nsegs)
116 {
117 int rseg, error;
118
119 KASSERT(dma != NULL);
120 KASSERT(dma->segs == NULL);
121 KASSERT(nsegs > 0);
122
123 dma->segs = kmem_zalloc(sizeof(*dma->segs) * nsegs, KM_SLEEP);
124 dma->nsegs = nsegs;
125
126 error = bus_dmamem_alloc(dmat, size, alignment, boundary, dma->segs,
127 nsegs, &rseg, BUS_DMA_WAITOK);
128 if (error) {
129 printf("%s: bus_dmamem_alloc failed: error=%d\n",
130 __func__, error);
131 goto fail1;
132 }
133 error = bus_dmamem_map(dmat, dma->segs, rseg, size, &dma->addr,
134 BUS_DMA_WAITOK);
135 if (error) {
136 printf("%s: bus_dmamem_map failed: error=%d\n",
137 __func__, error);
138 goto fail2;
139 }
140 error = bus_dmamap_create(dmat, size, rseg, size, boundary,
141 BUS_DMA_WAITOK, &dma->map);
142 if (error) {
143 printf("%s: bus_dmamap_create failed: error=%d\n",
144 __func__, error);
145 goto fail3;
146 }
147 error = bus_dmamap_load(dmat, dma->map, dma->addr, size, NULL,
148 BUS_DMA_READ | BUS_DMA_WRITE | BUS_DMA_WAITOK);
149 if (error) {
150 printf("%s: bus_dmamap_load failed: error=%d\n",
151 __func__, error);
152 goto fail4;
153 }
154
155 memset(dma->addr, 0, dma->map->dm_mapsize);
156 bus_dmamap_sync(dmat, dma->map, 0, dma->map->dm_mapsize,
157 BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
158
159 return dma->addr;
160
161 fail4: bus_dmamap_destroy(dmat, dma->map);
162 fail3: bus_dmamem_unmap(dmat, dma->addr, size);
163 dma->addr = NULL;
164 fail2: bus_dmamem_free(dmat, dma->segs, rseg);
165 fail1: kmem_free(dma->segs, sizeof(*dma->segs) * nsegs);
166 dma->segs = NULL;
167 dma->nsegs = 0;
168 return NULL;
169 }
170
171 void
hyperv_dma_free(bus_dma_tag_t dmat,struct hyperv_dma * dma)172 hyperv_dma_free(bus_dma_tag_t dmat, struct hyperv_dma *dma)
173 {
174 bus_size_t size = dma->map->dm_mapsize;
175 int rsegs = dma->map->dm_nsegs;
176
177 bus_dmamap_unload(dmat, dma->map);
178 bus_dmamap_destroy(dmat, dma->map);
179 bus_dmamem_unmap(dmat, dma->addr, size);
180 dma->addr = NULL;
181 bus_dmamem_free(dmat, dma->segs, rsegs);
182 kmem_free(dma->segs, sizeof(*dma->segs) * dma->nsegs);
183 dma->segs = NULL;
184 dma->nsegs = 0;
185 }
186