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 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 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 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 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 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 154 genfb_vmbus_shutdown(device_t self, int flags) 155 { 156 157 genfb_enable_polling(self); 158 return true; 159 } 160