drmfb.c revision 1.15
1 /* $NetBSD: drmfb.c,v 1.15 2022/09/01 12:01:36 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 1.15 2022/09/01 12:01:36 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 enum { CONS_VGA, CONS_GENFB, CONS_NONE } what_was_cons; 98 bool is_console; 99 int error; 100 101 /* genfb requires this. */ 102 KASSERTMSG((void *)&sc->sc_genfb == device_private(da->da_dev), 103 "drmfb_softc must be first member of device softc"); 104 105 sc->sc_da = *da; 106 107 prop_dictionary_set_uint32(dict, "width", sizes->surface_width); 108 prop_dictionary_set_uint32(dict, "height", sizes->surface_height); 109 prop_dictionary_set_uint8(dict, "depth", sizes->surface_bpp); 110 prop_dictionary_set_uint16(dict, "linebytes", da->da_fb_linebytes); 111 prop_dictionary_set_uint32(dict, "address", 0); /* XXX >32-bit */ 112 CTASSERT(sizeof(uintptr_t) <= sizeof(uint64_t)); 113 prop_dictionary_set_uint64(dict, "virtual_address", 114 (uint64_t)(uintptr_t)da->da_fb_vaddr); 115 116 prop_dictionary_set_uint64(dict, "mode_callback", 117 (uint64_t)(uintptr_t)&drmfb_genfb_mode_callback); 118 119 if (prop_dictionary_get_bool(pdict, "is_console", &is_console)) { 120 what_was_cons = CONS_NONE; 121 prop_dictionary_set_bool(dict, "is_console", is_console); 122 } else { 123 /* XXX Whattakludge! */ 124 #if NVGA > 0 125 if ((da->da_params->dp_is_vga_console != NULL) && 126 (*da->da_params->dp_is_vga_console)(dev)) { 127 what_was_cons = CONS_VGA; 128 prop_dictionary_set_bool(dict, "is_console", true); 129 vga_cndetach(); 130 if (da->da_params->dp_disable_vga) 131 (*da->da_params->dp_disable_vga)(dev); 132 } else 133 #endif 134 if (genfb_is_console() && genfb_is_enabled()) { 135 what_was_cons = CONS_GENFB; 136 prop_dictionary_set_bool(dict, "is_console", true); 137 } else { 138 what_was_cons = CONS_NONE; 139 prop_dictionary_set_bool(dict, "is_console", false); 140 } 141 } 142 143 /* Make the first EDID we find available to wsfb */ 144 drm_connector_list_iter_begin(da->da_fb_helper->dev, &conn_iter); 145 drm_client_for_each_connector_iter(connector, &conn_iter) { 146 struct drm_property_blob *edid = connector->edid_blob_ptr; 147 if (edid && edid->length) { 148 prop_dictionary_set_data(dict, "EDID", edid->data, 149 edid->length); 150 break; 151 } 152 } 153 drm_connector_list_iter_end(&conn_iter); 154 155 sc->sc_genfb.sc_dev = sc->sc_da.da_dev; 156 genfb_init(&sc->sc_genfb); 157 genfb_ops.genfb_ioctl = drmfb_genfb_ioctl; 158 genfb_ops.genfb_mmap = drmfb_genfb_mmap; 159 genfb_ops.genfb_enable_polling = drmfb_genfb_enable_polling; 160 genfb_ops.genfb_disable_polling = drmfb_genfb_disable_polling; 161 162 KERNEL_LOCK(1, NULL); 163 error = genfb_attach(&sc->sc_genfb, &genfb_ops); 164 KERNEL_UNLOCK_ONE(NULL); 165 if (error) { 166 aprint_error_dev(sc->sc_da.da_dev, 167 "failed to attach genfb: %d\n", error); 168 goto fail0; 169 } 170 171 /* Success! */ 172 return 0; 173 174 fail0: KASSERT(error); 175 /* XXX Restore console... */ 176 switch (what_was_cons) { 177 case CONS_VGA: 178 break; 179 case CONS_GENFB: 180 break; 181 case CONS_NONE: 182 break; 183 default: 184 break; 185 } 186 return error; 187 } 188 189 int 190 drmfb_detach(struct drmfb_softc *sc, int flags) 191 { 192 193 /* XXX genfb detach? */ 194 return 0; 195 } 196 197 static int 198 drmfb_genfb_ioctl(void *v, void *vs, unsigned long cmd, void *data, int flag, 199 struct lwp *l) 200 { 201 struct genfb_softc *const genfb = v; 202 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 203 sc_genfb); 204 int error; 205 206 if (sc->sc_da.da_params->dp_ioctl) { 207 error = (*sc->sc_da.da_params->dp_ioctl)(sc, cmd, data, flag, 208 l); 209 if (error != EPASSTHROUGH) 210 return error; 211 } 212 213 switch (cmd) { 214 /* 215 * Screen blanking ioctls. Not to be confused with backlight 216 * (can be disabled while stuff is still drawn on the screen), 217 * brightness, or contrast (which we don't support). Backlight 218 * and brightness are done through WSDISPLAYIO_{GET,SET}PARAM. 219 * This toggles between DPMS ON and DPMS OFF; backlight toggles 220 * between DPMS ON and DPMS SUSPEND. 221 */ 222 case WSDISPLAYIO_GVIDEO: { 223 int *onp = (int *)data; 224 225 /* XXX Can't really determine a single answer here. */ 226 *onp = 1; 227 return 0; 228 } 229 case WSDISPLAYIO_SVIDEO: { 230 const int on = *(const int *)data; 231 const int dpms_mode = on? DRM_MODE_DPMS_ON : DRM_MODE_DPMS_OFF; 232 struct drm_fb_helper *const fb_helper = sc->sc_da.da_fb_helper; 233 234 mutex_lock(&fb_helper->lock); 235 drm_client_modeset_dpms(&fb_helper->client, dpms_mode); 236 mutex_unlock(&fb_helper->lock); 237 238 return 0; 239 } 240 default: 241 return EPASSTHROUGH; 242 } 243 } 244 245 static paddr_t 246 drmfb_genfb_mmap(void *v, void *vs, off_t offset, int prot) 247 { 248 struct genfb_softc *const genfb = v; 249 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 250 sc_genfb); 251 252 KASSERT(0 <= offset); 253 254 if (offset < genfb->sc_fbsize) { 255 if (sc->sc_da.da_params->dp_mmapfb == NULL) 256 return -1; 257 return (*sc->sc_da.da_params->dp_mmapfb)(sc, offset, prot); 258 } else { 259 if (kauth_authorize_machdep(kauth_cred_get(), 260 KAUTH_MACHDEP_UNMANAGEDMEM, NULL, NULL, NULL, NULL) 261 != 0) 262 return -1; 263 if (sc->sc_da.da_params->dp_mmap == NULL) 264 return -1; 265 return (*sc->sc_da.da_params->dp_mmap)(sc, offset, prot); 266 } 267 } 268 269 static int 270 drmfb_genfb_enable_polling(void *cookie) 271 { 272 struct genfb_softc *const genfb = cookie; 273 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 274 sc_genfb); 275 276 return drm_fb_helper_debug_enter_fb(sc->sc_da.da_fb_helper); 277 } 278 279 static int 280 drmfb_genfb_disable_polling(void *cookie) 281 { 282 struct genfb_softc *const genfb = cookie; 283 struct drmfb_softc *const sc = container_of(genfb, struct drmfb_softc, 284 sc_genfb); 285 286 return drm_fb_helper_debug_leave_fb(sc->sc_da.da_fb_helper); 287 } 288 289 static bool 290 drmfb_genfb_setmode(struct genfb_softc *genfb, int mode) 291 { 292 struct drmfb_softc *sc = container_of(genfb, struct drmfb_softc, 293 sc_genfb); 294 struct drm_fb_helper *fb_helper = sc->sc_da.da_fb_helper; 295 296 if (mode == WSDISPLAYIO_MODE_EMUL) 297 drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); 298 299 return true; 300 } 301 302 bool 303 drmfb_shutdown(struct drmfb_softc *sc, int flags __unused) 304 { 305 306 genfb_enable_polling(sc->sc_da.da_dev); 307 return true; 308 } 309
Indexes created Sat Sep 27 14:09:57 GMT 2025