1 /* $NetBSD: drmfb.c,v 1.16 2022/09/01 17:54:47 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * drmfb: wsdisplay support, via genfb, for any drm device. Use this 34 * if you're too lazy to write a hardware-accelerated framebuffer using 35 * wsdisplay directly. 36 * 37 * This doesn't actually do anything interesting -- just hooks up 38 * drmkms crap and genfb crap. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: drmfb.c,v 1.16 2022/09/01 17:54:47 riastradh Exp $"); 43 44 #ifdef _KERNEL_OPT 45 #include "vga.h" 46 #endif 47 48 #include <sys/types.h> 49 #include <sys/param.h> 50 #include <sys/bus.h> 51 #include <sys/device.h> 52 #include <sys/kauth.h> 53 54 #if NVGA > 0 55 /* 56 * XXX All we really need is vga_is_console from vgavar.h, but the 57 * header files are missing their own dependencies, so we need to 58 * explicitly drag in the other crap. 59 */ 60 #include <dev/ic/mc6845reg.h> 61 #include <dev/ic/pcdisplayvar.h> 62 #include <dev/ic/vgareg.h> 63 #include <dev/ic/vgavar.h> 64 #endif 65 66 #include <dev/wsfb/genfbvar.h> 67 68 #include <drm/drm_device.h> 69 #include <drm/drm_fb_helper.h> 70 #include <drm/drmfb.h> 71 72 static int drmfb_genfb_ioctl(void *, void *, unsigned long, void *, int, 73 struct lwp *); 74 static paddr_t drmfb_genfb_mmap(void *, void *, off_t, int); 75 static int drmfb_genfb_enable_polling(void *); 76 static int drmfb_genfb_disable_polling(void *); 77 static bool drmfb_genfb_setmode(struct genfb_softc *, int); 78 79 static const struct genfb_mode_callback drmfb_genfb_mode_callback = { 80 .gmc_setmode = drmfb_genfb_setmode, 81 }; 82 83 int 84 drmfb_attach(struct drmfb_softc *sc, const struct drmfb_attach_args *da) 85 { 86 const struct drm_fb_helper_surface_size *const sizes = da->da_fb_sizes; 87 struct drm_connector_list_iter conn_iter; 88 struct drm_connector *connector; 89 const prop_dictionary_t dict = device_properties(da->da_dev); 90 const device_t parent = device_parent(da->da_dev); 91 const prop_dictionary_t pdict = device_properties(parent); 92 #if NVGA > 0 93 struct drm_device *const dev = da->da_fb_helper->dev; 94 #endif 95 static const struct genfb_ops zero_genfb_ops; 96 struct genfb_ops genfb_ops = zero_genfb_ops; 97 bool is_console; 98 int error __diagused; 99 100 /* genfb requires this. */ 101 KASSERTMSG((void *)&sc->sc_genfb == device_private(da->da_dev), 102 "drmfb_softc must be first member of device softc"); 103 104 sc->sc_da = *da; 105 106 prop_dictionary_set_uint32(dict, "width", sizes->surface_width); 107 prop_dictionary_set_uint32(dict, "height", sizes->surface_height); 108 prop_dictionary_set_uint8(dict, "depth", sizes->surface_bpp); 109 prop_dictionary_set_uint16(dict, "linebytes", da->da_fb_linebytes); 110 prop_dictionary_set_uint32(dict, "address", 0); /* XXX >32-bit */ 111 CTASSERT(sizeof(uintptr_t) <= sizeof(uint64_t)); 112 prop_dictionary_set_uint64(dict, "virtual_address", 113 (uint64_t)(uintptr_t)da->da_fb_vaddr); 114 115 prop_dictionary_set_uint64(dict, "mode_callback", 116 (uint64_t)(uintptr_t)&drmfb_genfb_mode_callback); 117 118 /* 119 * Determine whether MD firmware logic has set the console to 120 * go through this device. 121 */ 122 if (prop_dictionary_get_bool(pdict, "is_console", &is_console)) { 123 /* nothing */ 124 } else if (genfb_is_console() && genfb_is_enabled()) { 125 is_console = true; 126 } else { 127 is_console = false; 128 } 129 130 #if NVGA > 0 131 /* 132 * Whether or not we were told to be the console, if the 133 * console was configured to go through a vga resource that we 134 * now own and that vga(4) is not going to take over, kick out 135 * the vga console before we take over as genfb console. 136 */ 137 if ((da->da_params->dp_is_vga_console != NULL) && 138 (*da->da_params->dp_is_vga_console)(dev)) { 139 vga_cndetach(); 140 if (da->da_params->dp_disable_vga) 141 (*da->da_params->dp_disable_vga)(dev); 142 is_console = true; 143 } 144 #endif 145 146 prop_dictionary_set_bool(dict, "is_console", is_console); 147 148 /* Make the first EDID we find available to wsfb */ 149 drm_connector_list_iter_begin(da->da_fb_helper->dev, &conn_iter); 150 drm_client_for_each_connector_iter(connector, &conn_iter) { 151 struct drm_property_blob *edid = connector->edid_blob_ptr; 152 if (edid && edid->length) { 153 prop_dictionary_set_data(dict, "EDID", edid->data, 154 edid->length); 155 break; 156 } 157 } 158 drm_connector_list_iter_end(&conn_iter); 159 160 sc->sc_genfb.sc_dev = sc->sc_da.da_dev; 161 genfb_init(&sc->sc_genfb); 162 genfb_ops.genfb_ioctl = drmfb_genfb_ioctl; 163 genfb_ops.genfb_mmap = drmfb_genfb_mmap; 164 genfb_ops.genfb_enable_polling = drmfb_genfb_enable_polling; 165 genfb_ops.genfb_disable_polling = drmfb_genfb_disable_polling; 166 167 KERNEL_LOCK(1, NULL); 168 error = genfb_attach(&sc->sc_genfb, &genfb_ops); 169 KERNEL_UNLOCK_ONE(NULL); 170 KASSERTMSG(error == 0, "genfb_attach failed, error=%d", error); 171 172 /* Success! */ 173 return 0; 174 } 175 176 int 177 drmfb_detach(struct drmfb_softc *sc, int flags) 178 { 179 180 /* XXX genfb detach? */ 181 return 0; 182 } 183 184 static int 185 drmfb_genfb_ioctl(void *v, void *vs, unsigned long cmd, void *data, int flag, 186 struct lwp *l) 187 { 188 struct genfb_softc *const genfb = v; 189 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 190 sc_genfb); 191 int error; 192 193 if (sc->sc_da.da_params->dp_ioctl) { 194 error = (*sc->sc_da.da_params->dp_ioctl)(sc, cmd, data, flag, 195 l); 196 if (error != EPASSTHROUGH) 197 return error; 198 } 199 200 switch (cmd) { 201 /* 202 * Screen blanking ioctls. Not to be confused with backlight 203 * (can be disabled while stuff is still drawn on the screen), 204 * brightness, or contrast (which we don't support). Backlight 205 * and brightness are done through WSDISPLAYIO_{GET,SET}PARAM. 206 * This toggles between DPMS ON and DPMS OFF; backlight toggles 207 * between DPMS ON and DPMS SUSPEND. 208 */ 209 case WSDISPLAYIO_GVIDEO: { 210 int *onp = (int *)data; 211 212 /* XXX Can't really determine a single answer here. */ 213 *onp = 1; 214 return 0; 215 } 216 case WSDISPLAYIO_SVIDEO: { 217 const int on = *(const int *)data; 218 const int dpms_mode = on? DRM_MODE_DPMS_ON : DRM_MODE_DPMS_OFF; 219 struct drm_fb_helper *const fb_helper = sc->sc_da.da_fb_helper; 220 221 mutex_lock(&fb_helper->lock); 222 drm_client_modeset_dpms(&fb_helper->client, dpms_mode); 223 mutex_unlock(&fb_helper->lock); 224 225 return 0; 226 } 227 default: 228 return EPASSTHROUGH; 229 } 230 } 231 232 static paddr_t 233 drmfb_genfb_mmap(void *v, void *vs, off_t offset, int prot) 234 { 235 struct genfb_softc *const genfb = v; 236 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 237 sc_genfb); 238 239 KASSERT(0 <= offset); 240 241 if (offset < genfb->sc_fbsize) { 242 if (sc->sc_da.da_params->dp_mmapfb == NULL) 243 return -1; 244 return (*sc->sc_da.da_params->dp_mmapfb)(sc, offset, prot); 245 } else { 246 if (kauth_authorize_machdep(kauth_cred_get(), 247 KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) 248 != 0) 249 return -1; 250 if (sc->sc_da.da_params->dp_mmap == NULL) 251 return -1; 252 return (*sc->sc_da.da_params->dp_mmap)(sc, offset, prot); 253 } 254 } 255 256 static int 257 drmfb_genfb_enable_polling(void *cookie) 258 { 259 struct genfb_softc *const genfb = cookie; 260 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 261 sc_genfb); 262 263 return drm_fb_helper_debug_enter_fb(sc->sc_da.da_fb_helper); 264 } 265 266 static int 267 drmfb_genfb_disable_polling(void *cookie) 268 { 269 struct genfb_softc *const genfb = cookie; 270 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 271 sc_genfb); 272 273 return drm_fb_helper_debug_leave_fb(sc->sc_da.da_fb_helper); 274 } 275 276 static bool 277 drmfb_genfb_setmode(struct genfb_softc *genfb, int mode) 278 { 279 struct drmfb_softc *sc = container_of(genfb, struct drmfb_softc, 280 sc_genfb); 281 struct drm_fb_helper *fb_helper = sc->sc_da.da_fb_helper; 282 283 if (mode == WSDISPLAYIO_MODE_EMUL) 284 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); 285 286 return true; 287 } 288 289 bool 290 drmfb_shutdown(struct drmfb_softc *sc, int flags __unused) 291 { 292 293 genfb_enable_polling(sc->sc_da.da_dev); 294 return true; 295 } 296
Indexes created Sat Sep 20 22:09:52 GMT 2025