1 /* $NetBSD: genfb_vmbus.c,v 1.3 2021/08/07 16:19:11 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2007 Michael Lorenz
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __KERNEL_RCSID(0, "$NetBSD: genfb_vmbus.c,v 1.3 2021/08/07 16:19:11 thorpej Exp $");
31
32 #include "opt_wsfb.h"
33 #include "opt_genfb.h"
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/device.h>
39 #include <sys/proc.h>
40 #include <sys/mutex.h>
41 #include <sys/ioctl.h>
42 #include <sys/systm.h>
43 #include <sys/kauth.h>
44
45 #include <dev/wsfb/genfbvar.h>
46
47 #include <dev/hyperv/vmbusvar.h>
48 #include <dev/hyperv/genfb_vmbusvar.h>
49
50 static int genfb_vmbus_match(device_t, cfdata_t, void *);
51 static void genfb_vmbus_attach(device_t, device_t, void *);
52 static int genfb_vmbus_ioctl(void *, void *, u_long, void *, int,
53 struct lwp *);
54 static paddr_t genfb_vmbus_mmap(void *, void *, off_t, int);
55 static int genfb_vmbus_drm_print(void *, const char *);
56 static bool genfb_vmbus_shutdown(device_t, int);
57
58 CFATTACH_DECL_NEW(genfb_vmbus, sizeof(struct genfb_vmbus_softc),
59 genfb_vmbus_match, genfb_vmbus_attach, NULL, NULL);
60
61 static int
genfb_vmbus_match(device_t parent,cfdata_t match,void * aux)62 genfb_vmbus_match(device_t parent, cfdata_t match, void *aux)
63 {
64 struct vmbus_attach_args *aa = aux;
65
66 if (memcmp(aa->aa_type, &hyperv_guid_video, sizeof(*aa->aa_type)) != 0)
67 return 0;
68
69 if (!genfb_is_enabled())
70 return 0; /* explicitly disabled by MD code */
71
72 /* Use genfb(4) at pci in Gen.1 VM. */
73 if (hyperv_is_gen1())
74 return 0;
75
76 return 1;
77 }
78
79 static void
genfb_vmbus_attach(device_t parent,device_t self,void * aux)80 genfb_vmbus_attach(device_t parent, device_t self, void *aux)
81 {
82 static const struct genfb_ops zero_ops;
83 struct genfb_vmbus_softc *sc = device_private(self);
84 struct vmbus_attach_args *aa = aux;
85 struct genfb_ops ops = zero_ops;
86
87 aprint_naive("\n");
88 aprint_normal(": Hyper-V Synthetic Video\n");
89
90 sc->sc_gen.sc_dev = self;
91 sc->sc_memt = aa->aa_memt;
92
93 genfb_init(&sc->sc_gen);
94
95 /* firmware / MD code responsible for restoring the display */
96 if (sc->sc_gen.sc_pmfcb == NULL)
97 pmf_device_register1(self, NULL, NULL,
98 genfb_vmbus_shutdown);
99 else
100 pmf_device_register1(self,
101 sc->sc_gen.sc_pmfcb->gpc_suspend,
102 sc->sc_gen.sc_pmfcb->gpc_resume,
103 genfb_vmbus_shutdown);
104
105 if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) {
106 aprint_debug_dev(self, "not configured by firmware\n");
107 return;
108 }
109
110 ops.genfb_ioctl = genfb_vmbus_ioctl;
111 ops.genfb_mmap = genfb_vmbus_mmap;
112
113 if (genfb_attach(&sc->sc_gen, &ops) != 0)
114 return;
115
116 /* now try to attach a DRM */
117 config_found(self, aux, genfb_vmbus_drm_print,
118 CFARGS(.iattr = "drm"));
119 }
120
121 static int
genfb_vmbus_drm_print(void * aux,const char * pnp)122 genfb_vmbus_drm_print(void *aux, const char *pnp)
123 {
124
125 if (pnp)
126 aprint_normal("drm at %s", pnp);
127 return UNCONF;
128 }
129
130 static int
genfb_vmbus_ioctl(void * v,void * vs,u_long cmd,void * data,int flag,struct lwp * l)131 genfb_vmbus_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
132 struct lwp *l)
133 {
134
135 switch (cmd) {
136 case WSDISPLAYIO_GTYPE:
137 *(u_int *)data = WSDISPLAY_TYPE_GENFB;
138 return 0;
139 }
140
141 return EPASSTHROUGH;
142 }
143
144 static paddr_t
genfb_vmbus_mmap(void * v,void * vs,off_t offset,int prot)145 genfb_vmbus_mmap(void *v, void *vs, off_t offset, int prot)
146 {
147 struct genfb_vmbus_softc *sc = v;
148
149 return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, offset, prot,
150 BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
151 }
152
153 static bool
genfb_vmbus_shutdown(device_t self,int flags)154 genfb_vmbus_shutdown(device_t self, int flags)
155 {
156
157 genfb_enable_polling(self);
158 return true;
159 }
160