| 1 | /* |
| 2 | * xen paravirt framebuffer backend |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2005-2006 |
| 5 | * Copyright Red Hat, Inc. 2006-2008 |
| 6 | * |
| 7 | * Authors: |
| 8 | * Anthony Liguori <aliguori@us.ibm.com>, |
| 9 | * Markus Armbruster <armbru@redhat.com>, |
| 10 | * Daniel P. Berrange <berrange@redhat.com>, |
| 11 | * Pat Campbell <plc@novell.com>, |
| 12 | * Gerd Hoffmann <kraxel@redhat.com> |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; under version 2 of the License. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License along |
| 24 | * with this program; if not, see <http://www.gnu.org/licenses/>. |
| 25 | */ |
| 26 | |
| 27 | #include "qemu/osdep.h" |
| 28 | #include "qemu/units.h" |
| 29 | |
| 30 | #include "ui/input.h" |
| 31 | #include "ui/console.h" |
| 32 | #include "system/system.h" |
| 33 | #include "hw/xen/xen-legacy-backend.h" |
| 34 | |
| 35 | #include "hw/xen/interface/io/fbif.h" |
| 36 | #include "hw/xen/interface/io/kbdif.h" |
| 37 | #include "hw/xen/interface/io/protocols.h" |
| 38 | |
| 39 | #include "trace.h" |
| 40 | |
| 41 | #ifndef BTN_LEFT |
| 42 | #define BTN_LEFT 0x110 /* from <linux/input.h> */ |
| 43 | #endif |
| 44 | |
| 45 | /* -------------------------------------------------------------------- */ |
| 46 | |
| 47 | struct common { |
| 48 | struct XenLegacyDevice xendev; /* must be first */ |
| 49 | void *page; |
| 50 | }; |
| 51 | |
| 52 | struct XenInput { |
| 53 | struct common c; |
| 54 | int abs_pointer_wanted; /* Whether guest supports absolute pointer */ |
| 55 | int raw_pointer_wanted; /* Whether guest supports raw (unscaled) pointer */ |
| 56 | QemuInputHandlerState *qkbd; |
| 57 | QemuInputHandlerState *qmou; |
| 58 | int axis[INPUT_AXIS__MAX]; |
| 59 | int wheel; |
| 60 | }; |
| 61 | |
| 62 | #define UP_QUEUE 8 |
| 63 | |
| 64 | struct XenFB { |
| 65 | struct common c; |
| 66 | QemuConsole *con; |
| 67 | size_t fb_len; |
| 68 | int row_stride; |
| 69 | int depth; |
| 70 | int width; |
| 71 | int height; |
| 72 | int offset; |
| 73 | void *pixels; |
| 74 | int fbpages; |
| 75 | int feature_update; |
| 76 | int bug_trigger; |
| 77 | int do_resize; |
| 78 | |
| 79 | struct { |
| 80 | int x,y,w,h; |
| 81 | } up_rects[UP_QUEUE]; |
| 82 | int up_count; |
| 83 | int up_fullscreen; |
| 84 | }; |
| 85 | static const GraphicHwOps xenfb_ops; |
| 86 | |
| 87 | /* -------------------------------------------------------------------- */ |
| 88 | |
| 89 | static int common_bind(struct common *c) |
| 90 | { |
| 91 | uint64_t val; |
| 92 | xen_pfn_t mfn; |
| 93 | |
| 94 | if (xenstore_read_fe_uint64(&c->xendev, "page-ref", &val) == -1) |
| 95 | return -1; |
| 96 | mfn = (xen_pfn_t)val; |
| 97 | assert(val == mfn); |
| 98 | |
| 99 | if (xenstore_read_fe_int(&c->xendev, "event-channel", &c->xendev.remote_port) == -1) |
| 100 | return -1; |
| 101 | |
| 102 | c->page = qemu_xen_foreignmem_map(c->xendev.dom, NULL, |
| 103 | PROT_READ | PROT_WRITE, 1, &mfn, |
| 104 | NULL); |
| 105 | if (c->page == NULL) |
| 106 | return -1; |
| 107 | |
| 108 | xen_be_bind_evtchn(&c->xendev); |
| 109 | xen_pv_printf(&c->xendev, 1, |
| 110 | "ring mfn %"PRI_xen_pfn", remote-port %d, local-port %d\n", |
| 111 | mfn, c->xendev.remote_port, c->xendev.local_port); |
| 112 | |
| 113 | return 0; |
| 114 | } |
| 115 | |
| 116 | static void common_unbind(struct common *c) |
| 117 | { |
| 118 | xen_pv_unbind_evtchn(&c->xendev); |
| 119 | if (c->page) { |
| 120 | qemu_xen_foreignmem_unmap(c->page, 1); |
| 121 | c->page = NULL; |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | /* -------------------------------------------------------------------- */ |
| 126 | /* Send an event to the keyboard frontend driver */ |
| 127 | static int xenfb_kbd_event(struct XenInput *xenfb, |
| 128 | union xenkbd_in_event *event) |
| 129 | { |
| 130 | struct xenkbd_page *page = xenfb->c.page; |
| 131 | uint32_t prod; |
| 132 | |
| 133 | if (xenfb->c.xendev.be_state != XenbusStateConnected) |
| 134 | return 0; |
| 135 | if (!page) |
| 136 | return 0; |
| 137 | |
| 138 | prod = page->in_prod; |
| 139 | if (prod - page->in_cons == XENKBD_IN_RING_LEN) { |
| 140 | errno = EAGAIN; |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | xen_mb(); /* ensure ring space available */ |
| 145 | XENKBD_IN_RING_REF(page, prod) = *event; |
| 146 | xen_wmb(); /* ensure ring contents visible */ |
| 147 | page->in_prod = prod + 1; |
| 148 | return xen_pv_send_notify(&xenfb->c.xendev); |
| 149 | } |
| 150 | |
| 151 | /* Send a keyboard (or mouse button) event */ |
| 152 | static int xenfb_send_key(struct XenInput *xenfb, bool down, int keycode) |
| 153 | { |
| 154 | union xenkbd_in_event event; |
| 155 | |
| 156 | memset(&event, 0, XENKBD_IN_EVENT_SIZE); |
| 157 | event.type = XENKBD_TYPE_KEY; |
| 158 | event.key.pressed = down ? 1 : 0; |
| 159 | event.key.keycode = keycode; |
| 160 | |
| 161 | return xenfb_kbd_event(xenfb, &event); |
| 162 | } |
| 163 | |
| 164 | /* Send a relative mouse movement event */ |
| 165 | static int xenfb_send_motion(struct XenInput *xenfb, |
| 166 | int rel_x, int rel_y, int rel_z) |
| 167 | { |
| 168 | union xenkbd_in_event event; |
| 169 | |
| 170 | memset(&event, 0, XENKBD_IN_EVENT_SIZE); |
| 171 | event.type = XENKBD_TYPE_MOTION; |
| 172 | event.motion.rel_x = rel_x; |
| 173 | event.motion.rel_y = rel_y; |
| 174 | event.motion.rel_z = rel_z; |
| 175 | |
| 176 | return xenfb_kbd_event(xenfb, &event); |
| 177 | } |
| 178 | |
| 179 | /* Send an absolute mouse movement event */ |
| 180 | static int xenfb_send_position(struct XenInput *xenfb, |
| 181 | int abs_x, int abs_y, int z) |
| 182 | { |
| 183 | union xenkbd_in_event event; |
| 184 | |
| 185 | memset(&event, 0, XENKBD_IN_EVENT_SIZE); |
| 186 | event.type = XENKBD_TYPE_POS; |
| 187 | event.pos.abs_x = abs_x; |
| 188 | event.pos.abs_y = abs_y; |
| 189 | event.pos.rel_z = z; |
| 190 | |
| 191 | return xenfb_kbd_event(xenfb, &event); |
| 192 | } |
| 193 | |
| 194 | /* Send a key event from the client to the guest OS */ |
| 195 | static void xenfb_key_event(DeviceState *dev, QemuConsole *src, |
| 196 | QemuInputEvent *evt) |
| 197 | { |
| 198 | struct XenInput *xenfb = (struct XenInput *)dev; |
| 199 | |
| 200 | trace_xenfb_key_event(xenfb, evt->key.key, evt->key.down); |
| 201 | xenfb_send_key(xenfb, evt->key.down, evt->key.key); |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Send a mouse event from the client to the guest OS |
| 206 | * |
| 207 | * The QEMU mouse can be in either relative, or absolute mode. |
| 208 | * Movement is sent separately from button state, which has to |
| 209 | * be encoded as virtual key events. We also don't actually get |
| 210 | * given any button up/down events, so have to track changes in |
| 211 | * the button state. |
| 212 | */ |
| 213 | static void xenfb_mouse_event(DeviceState *dev, QemuConsole *src, |
| 214 | QemuInputEvent *evt) |
| 215 | { |
| 216 | struct XenInput *xenfb = (struct XenInput *)dev; |
| 217 | QemuConsole *con; |
| 218 | DisplaySurface *surface; |
| 219 | int scale; |
| 220 | |
| 221 | switch (evt->type) { |
| 222 | case INPUT_EVENT_KIND_BTN: |
| 223 | switch (evt->btn.button) { |
| 224 | case INPUT_BUTTON_LEFT: |
| 225 | xenfb_send_key(xenfb, evt->btn.down, BTN_LEFT); |
| 226 | break; |
| 227 | case INPUT_BUTTON_RIGHT: |
| 228 | xenfb_send_key(xenfb, evt->btn.down, BTN_LEFT + 1); |
| 229 | break; |
| 230 | case INPUT_BUTTON_MIDDLE: |
| 231 | xenfb_send_key(xenfb, evt->btn.down, BTN_LEFT + 2); |
| 232 | break; |
| 233 | case INPUT_BUTTON_WHEEL_UP: |
| 234 | if (evt->btn.down) { |
| 235 | xenfb->wheel--; |
| 236 | } |
| 237 | break; |
| 238 | case INPUT_BUTTON_WHEEL_DOWN: |
| 239 | if (evt->btn.down) { |
| 240 | xenfb->wheel++; |
| 241 | } |
| 242 | break; |
| 243 | default: |
| 244 | break; |
| 245 | } |
| 246 | break; |
| 247 | |
| 248 | case INPUT_EVENT_KIND_ABS: |
| 249 | if (xenfb->raw_pointer_wanted) { |
| 250 | xenfb->axis[evt->abs.axis] = evt->abs.value; |
| 251 | } else { |
| 252 | con = qemu_console_lookup_by_index(0); |
| 253 | if (!con) { |
| 254 | xen_pv_printf(&xenfb->c.xendev, 0, "No QEMU console available"); |
| 255 | return; |
| 256 | } |
| 257 | surface = qemu_console_surface(con); |
| 258 | switch (evt->abs.axis) { |
| 259 | case INPUT_AXIS_X: |
| 260 | scale = surface_width(surface) - 1; |
| 261 | break; |
| 262 | case INPUT_AXIS_Y: |
| 263 | scale = surface_height(surface) - 1; |
| 264 | break; |
| 265 | default: |
| 266 | g_assert_not_reached(); |
| 267 | } |
| 268 | xenfb->axis[evt->abs.axis] = evt->abs.value * scale / 0x7fff; |
| 269 | } |
| 270 | break; |
| 271 | |
| 272 | case INPUT_EVENT_KIND_REL: |
| 273 | xenfb->axis[evt->rel.axis] += evt->rel.value; |
| 274 | break; |
| 275 | |
| 276 | default: |
| 277 | break; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | static void xenfb_mouse_sync(DeviceState *dev) |
| 282 | { |
| 283 | struct XenInput *xenfb = (struct XenInput *)dev; |
| 284 | |
| 285 | trace_xenfb_mouse_event(xenfb, xenfb->axis[INPUT_AXIS_X], |
| 286 | xenfb->axis[INPUT_AXIS_Y], |
| 287 | xenfb->wheel, 0, |
| 288 | xenfb->abs_pointer_wanted); |
| 289 | if (xenfb->abs_pointer_wanted) { |
| 290 | xenfb_send_position(xenfb, xenfb->axis[INPUT_AXIS_X], |
| 291 | xenfb->axis[INPUT_AXIS_Y], |
| 292 | xenfb->wheel); |
| 293 | } else { |
| 294 | xenfb_send_motion(xenfb, xenfb->axis[INPUT_AXIS_X], |
| 295 | xenfb->axis[INPUT_AXIS_Y], |
| 296 | xenfb->wheel); |
| 297 | xenfb->axis[INPUT_AXIS_X] = 0; |
| 298 | xenfb->axis[INPUT_AXIS_Y] = 0; |
| 299 | } |
| 300 | xenfb->wheel = 0; |
| 301 | } |
| 302 | |
| 303 | static const QemuInputHandler xenfb_keyboard = { |
| 304 | .name = "Xen PV Keyboard", |
| 305 | .mask = INPUT_EVENT_MASK_KEY, |
| 306 | .event = xenfb_key_event, |
| 307 | }; |
| 308 | |
| 309 | static const QemuInputHandler xenfb_abs_mouse = { |
| 310 | .name = "Xen PV Mouse", |
| 311 | .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_ABS, |
| 312 | .event = xenfb_mouse_event, |
| 313 | .sync = xenfb_mouse_sync, |
| 314 | }; |
| 315 | |
| 316 | static const QemuInputHandler xenfb_rel_mouse = { |
| 317 | .name = "Xen PV Mouse", |
| 318 | .mask = INPUT_EVENT_MASK_BTN | INPUT_EVENT_MASK_REL, |
| 319 | .event = xenfb_mouse_event, |
| 320 | .sync = xenfb_mouse_sync, |
| 321 | }; |
| 322 | |
| 323 | static int input_init(struct XenLegacyDevice *xendev) |
| 324 | { |
| 325 | xenstore_write_be_int(xendev, "feature-abs-pointer", 1); |
| 326 | xenstore_write_be_int(xendev, "feature-raw-pointer", 1); |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | static int input_initialise(struct XenLegacyDevice *xendev) |
| 331 | { |
| 332 | struct XenInput *in = container_of(xendev, struct XenInput, c.xendev); |
| 333 | int rc; |
| 334 | |
| 335 | rc = common_bind(&in->c); |
| 336 | if (rc != 0) |
| 337 | return rc; |
| 338 | |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | static void input_connected(struct XenLegacyDevice *xendev) |
| 343 | { |
| 344 | struct XenInput *in = container_of(xendev, struct XenInput, c.xendev); |
| 345 | |
| 346 | if (xenstore_read_fe_int(xendev, "request-abs-pointer", |
| 347 | &in->abs_pointer_wanted) == -1) { |
| 348 | in->abs_pointer_wanted = 0; |
| 349 | } |
| 350 | if (xenstore_read_fe_int(xendev, "request-raw-pointer", |
| 351 | &in->raw_pointer_wanted) == -1) { |
| 352 | in->raw_pointer_wanted = 0; |
| 353 | } |
| 354 | if (in->raw_pointer_wanted && in->abs_pointer_wanted == 0) { |
| 355 | xen_pv_printf(xendev, 0, "raw pointer set without abs pointer"); |
| 356 | } |
| 357 | |
| 358 | if (in->qkbd) { |
| 359 | qemu_input_handler_unregister(in->qkbd); |
| 360 | } |
| 361 | if (in->qmou) { |
| 362 | qemu_input_handler_unregister(in->qmou); |
| 363 | } |
| 364 | trace_xenfb_input_connected(xendev, in->abs_pointer_wanted); |
| 365 | |
| 366 | in->qkbd = qemu_input_handler_register((DeviceState *)in, &xenfb_keyboard); |
| 367 | in->qmou = qemu_input_handler_register((DeviceState *)in, |
| 368 | in->abs_pointer_wanted ? &xenfb_abs_mouse : &xenfb_rel_mouse); |
| 369 | |
| 370 | if (in->raw_pointer_wanted) { |
| 371 | qemu_input_handler_activate(in->qkbd); |
| 372 | qemu_input_handler_activate(in->qmou); |
| 373 | } |
| 374 | } |
| 375 | |
| 376 | static void input_disconnect(struct XenLegacyDevice *xendev) |
| 377 | { |
| 378 | struct XenInput *in = container_of(xendev, struct XenInput, c.xendev); |
| 379 | |
| 380 | if (in->qkbd) { |
| 381 | qemu_input_handler_unregister(in->qkbd); |
| 382 | in->qkbd = NULL; |
| 383 | } |
| 384 | if (in->qmou) { |
| 385 | qemu_input_handler_unregister(in->qmou); |
| 386 | in->qmou = NULL; |
| 387 | } |
| 388 | common_unbind(&in->c); |
| 389 | } |
| 390 | |
| 391 | static void input_event(struct XenLegacyDevice *xendev) |
| 392 | { |
| 393 | struct XenInput *xenfb = container_of(xendev, struct XenInput, c.xendev); |
| 394 | struct xenkbd_page *page = xenfb->c.page; |
| 395 | |
| 396 | /* We don't understand any keyboard events, so just ignore them. */ |
| 397 | if (page->out_prod == page->out_cons) |
| 398 | return; |
| 399 | page->out_cons = page->out_prod; |
| 400 | xen_pv_send_notify(&xenfb->c.xendev); |
| 401 | } |
| 402 | |
| 403 | /* -------------------------------------------------------------------- */ |
| 404 | |
| 405 | static void xenfb_copy_mfns(int mode, int count, xen_pfn_t *dst, void *src) |
| 406 | { |
| 407 | uint32_t *src32 = src; |
| 408 | uint64_t *src64 = src; |
| 409 | int i; |
| 410 | |
| 411 | for (i = 0; i < count; i++) |
| 412 | dst[i] = (mode == 32) ? src32[i] : src64[i]; |
| 413 | } |
| 414 | |
| 415 | static int xenfb_map_fb(struct XenFB *xenfb) |
| 416 | { |
| 417 | struct xenfb_page *page = xenfb->c.page; |
| 418 | char *protocol = xenfb->c.xendev.protocol; |
| 419 | int n_fbdirs; |
| 420 | xen_pfn_t *pgmfns = NULL; |
| 421 | xen_pfn_t *fbmfns = NULL; |
| 422 | void *map, *pd; |
| 423 | int mode, ret = -1; |
| 424 | |
| 425 | /* default to native */ |
| 426 | pd = page->pd; |
| 427 | mode = sizeof(unsigned long) * 8; |
| 428 | |
| 429 | if (!protocol) { |
| 430 | /* |
| 431 | * Undefined protocol, some guesswork needed. |
| 432 | * |
| 433 | * Old frontends which don't set the protocol use |
| 434 | * one page directory only, thus pd[1] must be zero. |
| 435 | * pd[1] of the 32bit struct layout and the lower |
| 436 | * 32 bits of pd[0] of the 64bit struct layout have |
| 437 | * the same location, so we can check that ... |
| 438 | */ |
| 439 | uint32_t *ptr32 = NULL; |
| 440 | uint32_t *ptr64 = NULL; |
| 441 | #if defined(__x86_64__) |
| 442 | ptr32 = ((void*)page->pd) - 4; |
| 443 | ptr64 = (void*)page->pd; |
| 444 | #endif |
| 445 | if (ptr32) { |
| 446 | if (ptr32[1] == 0) { |
| 447 | mode = 32; |
| 448 | pd = ptr32; |
| 449 | } else { |
| 450 | mode = 64; |
| 451 | pd = ptr64; |
| 452 | } |
| 453 | } |
| 454 | #if defined(__x86_64__) |
| 455 | } else if (strcmp(protocol, XEN_IO_PROTO_ABI_X86_32) == 0) { |
| 456 | /* 64bit dom0, 32bit domU */ |
| 457 | mode = 32; |
| 458 | pd = ((void*)page->pd) - 4; |
| 459 | #endif |
| 460 | } |
| 461 | |
| 462 | if (xenfb->pixels) { |
| 463 | munmap(xenfb->pixels, xenfb->fbpages * XEN_PAGE_SIZE); |
| 464 | xenfb->pixels = NULL; |
| 465 | } |
| 466 | |
| 467 | xenfb->fbpages = DIV_ROUND_UP(xenfb->fb_len, XEN_PAGE_SIZE); |
| 468 | n_fbdirs = xenfb->fbpages * mode / 8; |
| 469 | n_fbdirs = DIV_ROUND_UP(n_fbdirs, XEN_PAGE_SIZE); |
| 470 | |
| 471 | pgmfns = g_new0(xen_pfn_t, n_fbdirs); |
| 472 | fbmfns = g_new0(xen_pfn_t, xenfb->fbpages); |
| 473 | |
| 474 | xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd); |
| 475 | map = qemu_xen_foreignmem_map(xenfb->c.xendev.dom, NULL, PROT_READ, |
| 476 | n_fbdirs, pgmfns, NULL); |
| 477 | if (map == NULL) |
| 478 | goto out; |
| 479 | xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map); |
| 480 | qemu_xen_foreignmem_unmap(map, n_fbdirs); |
| 481 | |
| 482 | xenfb->pixels = qemu_xen_foreignmem_map(xenfb->c.xendev.dom, NULL, |
| 483 | PROT_READ, xenfb->fbpages, |
| 484 | fbmfns, NULL); |
| 485 | if (xenfb->pixels == NULL) |
| 486 | goto out; |
| 487 | |
| 488 | ret = 0; /* all is fine */ |
| 489 | |
| 490 | out: |
| 491 | g_free(pgmfns); |
| 492 | g_free(fbmfns); |
| 493 | return ret; |
| 494 | } |
| 495 | |
| 496 | static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim, |
| 497 | int width, int height, int depth, |
| 498 | size_t fb_len, int offset, int row_stride) |
| 499 | { |
| 500 | size_t mfn_sz = sizeof_field(struct xenfb_page, pd[0]); |
| 501 | size_t pd_len = sizeof_field(struct xenfb_page, pd) / mfn_sz; |
| 502 | size_t fb_pages = pd_len * XEN_PAGE_SIZE / mfn_sz; |
| 503 | size_t fb_len_max = fb_pages * XEN_PAGE_SIZE; |
| 504 | int max_width, max_height; |
| 505 | |
| 506 | if (fb_len_lim > fb_len_max) { |
| 507 | xen_pv_printf(&xenfb->c.xendev, 0, |
| 508 | "fb size limit %zu exceeds %zu, corrected\n", |
| 509 | fb_len_lim, fb_len_max); |
| 510 | fb_len_lim = fb_len_max; |
| 511 | } |
| 512 | if (fb_len_lim && fb_len > fb_len_lim) { |
| 513 | xen_pv_printf(&xenfb->c.xendev, 0, |
| 514 | "frontend fb size %zu limited to %zu\n", |
| 515 | fb_len, fb_len_lim); |
| 516 | fb_len = fb_len_lim; |
| 517 | } |
| 518 | if (depth != 8 && depth != 16 && depth != 24 && depth != 32) { |
| 519 | xen_pv_printf(&xenfb->c.xendev, 0, |
| 520 | "can't handle frontend fb depth %d\n", |
| 521 | depth); |
| 522 | return -1; |
| 523 | } |
| 524 | if (row_stride <= 0 || row_stride > fb_len) { |
| 525 | xen_pv_printf(&xenfb->c.xendev, 0, "invalid frontend stride %d\n", |
| 526 | row_stride); |
| 527 | return -1; |
| 528 | } |
| 529 | max_width = row_stride / (depth / 8); |
| 530 | if (width < 0 || width > max_width) { |
| 531 | xen_pv_printf(&xenfb->c.xendev, 0, |
| 532 | "invalid frontend width %d limited to %d\n", |
| 533 | width, max_width); |
| 534 | width = max_width; |
| 535 | } |
| 536 | if (offset < 0 || offset >= fb_len) { |
| 537 | xen_pv_printf(&xenfb->c.xendev, 0, |
| 538 | "invalid frontend offset %d (max %zu)\n", |
| 539 | offset, fb_len - 1); |
| 540 | return -1; |
| 541 | } |
| 542 | max_height = (fb_len - offset) / row_stride; |
| 543 | if (height < 0 || height > max_height) { |
| 544 | xen_pv_printf(&xenfb->c.xendev, 0, |
| 545 | "invalid frontend height %d limited to %d\n", |
| 546 | height, max_height); |
| 547 | height = max_height; |
| 548 | } |
| 549 | xenfb->fb_len = fb_len; |
| 550 | xenfb->row_stride = row_stride; |
| 551 | xenfb->depth = depth; |
| 552 | xenfb->width = width; |
| 553 | xenfb->height = height; |
| 554 | xenfb->offset = offset; |
| 555 | xenfb->up_fullscreen = 1; |
| 556 | xenfb->do_resize = 1; |
| 557 | xen_pv_printf(&xenfb->c.xendev, 1, |
| 558 | "framebuffer %dx%dx%d offset %d stride %d\n", |
| 559 | width, height, depth, offset, row_stride); |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | /* A convenient function for munging pixels between different depths */ |
| 564 | #define BLT(SRC_T,DST_T,RSB,GSB,BSB,RDB,GDB,BDB) \ |
| 565 | for (line = y ; line < (y+h) ; line++) { \ |
| 566 | SRC_T *src = (SRC_T *)(xenfb->pixels \ |
| 567 | + xenfb->offset \ |
| 568 | + (line * xenfb->row_stride) \ |
| 569 | + (x * xenfb->depth / 8)); \ |
| 570 | DST_T *dst = (DST_T *)(data \ |
| 571 | + (line * linesize) \ |
| 572 | + (x * bpp / 8)); \ |
| 573 | int col; \ |
| 574 | const int RSS = 32 - (RSB + GSB + BSB); \ |
| 575 | const int GSS = 32 - (GSB + BSB); \ |
| 576 | const int BSS = 32 - (BSB); \ |
| 577 | const uint32_t RSM = (~0U) << (32 - RSB); \ |
| 578 | const uint32_t GSM = (~0U) << (32 - GSB); \ |
| 579 | const uint32_t BSM = (~0U) << (32 - BSB); \ |
| 580 | const int RDS = 32 - (RDB + GDB + BDB); \ |
| 581 | const int GDS = 32 - (GDB + BDB); \ |
| 582 | const int BDS = 32 - (BDB); \ |
| 583 | const uint32_t RDM = (~0U) << (32 - RDB); \ |
| 584 | const uint32_t GDM = (~0U) << (32 - GDB); \ |
| 585 | const uint32_t BDM = (~0U) << (32 - BDB); \ |
| 586 | for (col = x ; col < (x+w) ; col++) { \ |
| 587 | uint32_t spix = *src; \ |
| 588 | *dst = (((spix << RSS) & RSM & RDM) >> RDS) | \ |
| 589 | (((spix << GSS) & GSM & GDM) >> GDS) | \ |
| 590 | (((spix << BSS) & BSM & BDM) >> BDS); \ |
| 591 | src = (SRC_T *) ((unsigned long) src + xenfb->depth / 8); \ |
| 592 | dst = (DST_T *) ((unsigned long) dst + bpp / 8); \ |
| 593 | } \ |
| 594 | } |
| 595 | |
| 596 | |
| 597 | /* |
| 598 | * This copies data from the guest framebuffer region, into QEMU's |
| 599 | * displaysurface. qemu uses 16 or 32 bpp. In case the pv framebuffer |
| 600 | * uses something else we must convert and copy, otherwise we can |
| 601 | * supply the buffer directly and no thing here. |
| 602 | */ |
| 603 | static void xenfb_guest_copy(struct XenFB *xenfb, int x, int y, int w, int h) |
| 604 | { |
| 605 | DisplaySurface *surface = qemu_console_surface(xenfb->con); |
| 606 | int line, oops = 0; |
| 607 | int bpp = surface_bits_per_pixel(surface); |
| 608 | int linesize = surface_stride(surface); |
| 609 | uint8_t *data = surface_data(surface); |
| 610 | |
| 611 | if (surface_is_allocated(surface)) { |
| 612 | switch (xenfb->depth) { |
| 613 | case 8: |
| 614 | if (bpp == 16) { |
| 615 | BLT(uint8_t, uint16_t, 3, 3, 2, 5, 6, 5); |
| 616 | } else if (bpp == 32) { |
| 617 | BLT(uint8_t, uint32_t, 3, 3, 2, 8, 8, 8); |
| 618 | } else { |
| 619 | oops = 1; |
| 620 | } |
| 621 | break; |
| 622 | case 24: |
| 623 | if (bpp == 16) { |
| 624 | BLT(uint32_t, uint16_t, 8, 8, 8, 5, 6, 5); |
| 625 | } else if (bpp == 32) { |
| 626 | BLT(uint32_t, uint32_t, 8, 8, 8, 8, 8, 8); |
| 627 | } else { |
| 628 | oops = 1; |
| 629 | } |
| 630 | break; |
| 631 | default: |
| 632 | oops = 1; |
| 633 | } |
| 634 | } |
| 635 | if (oops) /* should not happen */ |
| 636 | xen_pv_printf(&xenfb->c.xendev, 0, "%s: oops: convert %d -> %d bpp?\n", |
| 637 | __func__, xenfb->depth, bpp); |
| 638 | |
| 639 | qemu_console_update(xenfb->con, x, y, w, h); |
| 640 | } |
| 641 | |
| 642 | #ifdef XENFB_TYPE_REFRESH_PERIOD |
| 643 | static int xenfb_queue_full(struct XenFB *xenfb) |
| 644 | { |
| 645 | struct xenfb_page *page = xenfb->c.page; |
| 646 | uint32_t cons, prod; |
| 647 | |
| 648 | if (!page) |
| 649 | return 1; |
| 650 | |
| 651 | prod = page->in_prod; |
| 652 | cons = page->in_cons; |
| 653 | return prod - cons == XENFB_IN_RING_LEN; |
| 654 | } |
| 655 | |
| 656 | static void xenfb_send_event(struct XenFB *xenfb, union xenfb_in_event *event) |
| 657 | { |
| 658 | uint32_t prod; |
| 659 | struct xenfb_page *page = xenfb->c.page; |
| 660 | |
| 661 | prod = page->in_prod; |
| 662 | /* caller ensures !xenfb_queue_full() */ |
| 663 | xen_mb(); /* ensure ring space available */ |
| 664 | XENFB_IN_RING_REF(page, prod) = *event; |
| 665 | xen_wmb(); /* ensure ring contents visible */ |
| 666 | page->in_prod = prod + 1; |
| 667 | |
| 668 | xen_pv_send_notify(&xenfb->c.xendev); |
| 669 | } |
| 670 | |
| 671 | static void xenfb_send_refresh_period(struct XenFB *xenfb, int period) |
| 672 | { |
| 673 | union xenfb_in_event event; |
| 674 | |
| 675 | memset(&event, 0, sizeof(event)); |
| 676 | event.type = XENFB_TYPE_REFRESH_PERIOD; |
| 677 | event.refresh_period.period = period; |
| 678 | xenfb_send_event(xenfb, &event); |
| 679 | } |
| 680 | #endif |
| 681 | |
| 682 | /* |
| 683 | * Periodic update of display. |
| 684 | * Also transmit the refresh interval to the frontend. |
| 685 | * |
| 686 | * Never ever do any qemu display operations |
| 687 | * (resize, screen update) outside this function. |
| 688 | * Our screen might be inactive. When asked for |
| 689 | * an update we know it is active. |
| 690 | */ |
| 691 | static bool xenfb_update(void *opaque) |
| 692 | { |
| 693 | struct XenFB *xenfb = opaque; |
| 694 | DisplaySurface *surface; |
| 695 | int i; |
| 696 | |
| 697 | if (xenfb->c.xendev.be_state != XenbusStateConnected) |
| 698 | return true; |
| 699 | |
| 700 | if (!xenfb->feature_update) { |
| 701 | /* we don't get update notifications, thus use the |
| 702 | * sledge hammer approach ... */ |
| 703 | xenfb->up_fullscreen = 1; |
| 704 | } |
| 705 | |
| 706 | /* resize if needed */ |
| 707 | if (xenfb->do_resize) { |
| 708 | pixman_format_code_t format; |
| 709 | |
| 710 | xenfb->do_resize = 0; |
| 711 | switch (xenfb->depth) { |
| 712 | case 16: |
| 713 | case 32: |
| 714 | /* console.c supported depth -> buffer can be used directly */ |
| 715 | format = qemu_default_pixman_format(xenfb->depth, true); |
| 716 | surface = qemu_create_displaysurface_from |
| 717 | (xenfb->width, xenfb->height, format, |
| 718 | xenfb->row_stride, xenfb->pixels + xenfb->offset); |
| 719 | break; |
| 720 | default: |
| 721 | /* we must convert stuff */ |
| 722 | surface = qemu_create_displaysurface(xenfb->width, xenfb->height); |
| 723 | break; |
| 724 | } |
| 725 | qemu_console_set_surface(xenfb->con, surface); |
| 726 | xen_pv_printf(&xenfb->c.xendev, 1, |
| 727 | "update: resizing: %dx%d @ %d bpp%s\n", |
| 728 | xenfb->width, xenfb->height, xenfb->depth, |
| 729 | surface_is_allocated(surface) |
| 730 | ? " (allocated)" : " (borrowed)"); |
| 731 | xenfb->up_fullscreen = 1; |
| 732 | } |
| 733 | |
| 734 | /* run queued updates */ |
| 735 | if (xenfb->up_fullscreen) { |
| 736 | xen_pv_printf(&xenfb->c.xendev, 3, "update: fullscreen\n"); |
| 737 | xenfb_guest_copy(xenfb, 0, 0, xenfb->width, xenfb->height); |
| 738 | } else if (xenfb->up_count) { |
| 739 | xen_pv_printf(&xenfb->c.xendev, 3, "update: %d rects\n", |
| 740 | xenfb->up_count); |
| 741 | for (i = 0; i < xenfb->up_count; i++) |
| 742 | xenfb_guest_copy(xenfb, |
| 743 | xenfb->up_rects[i].x, |
| 744 | xenfb->up_rects[i].y, |
| 745 | xenfb->up_rects[i].w, |
| 746 | xenfb->up_rects[i].h); |
| 747 | } else { |
| 748 | xen_pv_printf(&xenfb->c.xendev, 3, "update: nothing\n"); |
| 749 | } |
| 750 | xenfb->up_count = 0; |
| 751 | xenfb->up_fullscreen = 0; |
| 752 | |
| 753 | return true; |
| 754 | } |
| 755 | |
| 756 | static void xenfb_ui_info(void *opaque, uint32_t idx, QemuUIInfo *info) |
| 757 | { |
| 758 | struct XenFB *xenfb = opaque; |
| 759 | uint32_t refresh_rate; |
| 760 | |
| 761 | if (xenfb->feature_update) { |
| 762 | #ifdef XENFB_TYPE_REFRESH_PERIOD |
| 763 | if (xenfb_queue_full(xenfb)) { |
| 764 | return; |
| 765 | } |
| 766 | |
| 767 | refresh_rate = info->refresh_rate; |
| 768 | if (!refresh_rate) { |
| 769 | refresh_rate = 75; |
| 770 | } |
| 771 | |
| 772 | /* T = 1 / f = 1 [s*Hz] / f = 1000*1000 [ms*mHz] / f */ |
| 773 | xenfb_send_refresh_period(xenfb, 1000 * 1000 / refresh_rate); |
| 774 | #endif |
| 775 | } |
| 776 | } |
| 777 | |
| 778 | /* QEMU display state changed, so refresh the framebuffer copy */ |
| 779 | static void xenfb_invalidate(void *opaque) |
| 780 | { |
| 781 | struct XenFB *xenfb = opaque; |
| 782 | xenfb->up_fullscreen = 1; |
| 783 | } |
| 784 | |
| 785 | static void xenfb_handle_events(struct XenFB *xenfb) |
| 786 | { |
| 787 | uint32_t prod, cons, out_cons; |
| 788 | struct xenfb_page *page = xenfb->c.page; |
| 789 | |
| 790 | prod = page->out_prod; |
| 791 | out_cons = page->out_cons; |
| 792 | if (prod - out_cons > XENFB_OUT_RING_LEN) { |
| 793 | return; |
| 794 | } |
| 795 | xen_rmb(); /* ensure we see ring contents up to prod */ |
| 796 | for (cons = out_cons; cons != prod; cons++) { |
| 797 | union xenfb_out_event *event = &XENFB_OUT_RING_REF(page, cons); |
| 798 | uint8_t type = event->type; |
| 799 | int x, y, w, h; |
| 800 | |
| 801 | switch (type) { |
| 802 | case XENFB_TYPE_UPDATE: |
| 803 | if (xenfb->up_count == UP_QUEUE) |
| 804 | xenfb->up_fullscreen = 1; |
| 805 | if (xenfb->up_fullscreen) |
| 806 | break; |
| 807 | x = MAX(event->update.x, 0); |
| 808 | y = MAX(event->update.y, 0); |
| 809 | w = MIN(event->update.width, xenfb->width - x); |
| 810 | h = MIN(event->update.height, xenfb->height - y); |
| 811 | if (w < 0 || h < 0) { |
| 812 | xen_pv_printf(&xenfb->c.xendev, 1, "bogus update ignored\n"); |
| 813 | break; |
| 814 | } |
| 815 | if (x != event->update.x || |
| 816 | y != event->update.y || |
| 817 | w != event->update.width || |
| 818 | h != event->update.height) { |
| 819 | xen_pv_printf(&xenfb->c.xendev, 1, "bogus update clipped\n"); |
| 820 | } |
| 821 | if (w == xenfb->width && h > xenfb->height / 2) { |
| 822 | /* scroll detector: updated more than 50% of the lines, |
| 823 | * don't bother keeping track of the rectangles then */ |
| 824 | xenfb->up_fullscreen = 1; |
| 825 | } else { |
| 826 | xenfb->up_rects[xenfb->up_count].x = x; |
| 827 | xenfb->up_rects[xenfb->up_count].y = y; |
| 828 | xenfb->up_rects[xenfb->up_count].w = w; |
| 829 | xenfb->up_rects[xenfb->up_count].h = h; |
| 830 | xenfb->up_count++; |
| 831 | } |
| 832 | break; |
| 833 | #ifdef XENFB_TYPE_RESIZE |
| 834 | case XENFB_TYPE_RESIZE: |
| 835 | if (xenfb_configure_fb(xenfb, xenfb->fb_len, |
| 836 | event->resize.width, |
| 837 | event->resize.height, |
| 838 | event->resize.depth, |
| 839 | xenfb->fb_len, |
| 840 | event->resize.offset, |
| 841 | event->resize.stride) < 0) |
| 842 | break; |
| 843 | xenfb_invalidate(xenfb); |
| 844 | break; |
| 845 | #endif |
| 846 | } |
| 847 | } |
| 848 | xen_mb(); /* ensure we're done with ring contents */ |
| 849 | page->out_cons = cons; |
| 850 | } |
| 851 | |
| 852 | static int fb_init(struct XenLegacyDevice *xendev) |
| 853 | { |
| 854 | #ifdef XENFB_TYPE_RESIZE |
| 855 | xenstore_write_be_int(xendev, "feature-resize", 1); |
| 856 | #endif |
| 857 | return 0; |
| 858 | } |
| 859 | |
| 860 | static int fb_initialise(struct XenLegacyDevice *xendev) |
| 861 | { |
| 862 | struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev); |
| 863 | struct xenfb_page *fb_page; |
| 864 | int videoram; |
| 865 | int rc; |
| 866 | |
| 867 | if (xenstore_read_fe_int(xendev, "videoram", &videoram) == -1) |
| 868 | videoram = 0; |
| 869 | |
| 870 | rc = common_bind(&fb->c); |
| 871 | if (rc != 0) |
| 872 | return rc; |
| 873 | |
| 874 | fb_page = fb->c.page; |
| 875 | rc = xenfb_configure_fb(fb, videoram * MiB, |
| 876 | fb_page->width, fb_page->height, fb_page->depth, |
| 877 | fb_page->mem_length, 0, fb_page->line_length); |
| 878 | if (rc != 0) |
| 879 | return rc; |
| 880 | |
| 881 | rc = xenfb_map_fb(fb); |
| 882 | if (rc != 0) |
| 883 | return rc; |
| 884 | |
| 885 | fb->con = qemu_graphic_console_create(NULL, 0, &xenfb_ops, fb); |
| 886 | |
| 887 | if (xenstore_read_fe_int(xendev, "feature-update", &fb->feature_update) == -1) |
| 888 | fb->feature_update = 0; |
| 889 | if (fb->feature_update) |
| 890 | xenstore_write_be_int(xendev, "request-update", 1); |
| 891 | |
| 892 | xen_pv_printf(xendev, 1, "feature-update=%d, videoram=%d\n", |
| 893 | fb->feature_update, videoram); |
| 894 | return 0; |
| 895 | } |
| 896 | |
| 897 | static void fb_disconnect(struct XenLegacyDevice *xendev) |
| 898 | { |
| 899 | struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev); |
| 900 | |
| 901 | /* |
| 902 | * FIXME: qemu can't un-init gfx display (yet?). |
| 903 | * Replacing the framebuffer with anonymous shared memory |
| 904 | * instead. This releases the guest pages and keeps qemu happy. |
| 905 | */ |
| 906 | qemu_xen_foreignmem_unmap(fb->pixels, fb->fbpages); |
| 907 | fb->pixels = mmap(fb->pixels, fb->fbpages * XEN_PAGE_SIZE, |
| 908 | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON, |
| 909 | -1, 0); |
| 910 | if (fb->pixels == MAP_FAILED) { |
| 911 | xen_pv_printf(xendev, 0, |
| 912 | "Couldn't replace the framebuffer with anonymous memory errno=%d\n", |
| 913 | errno); |
| 914 | } |
| 915 | common_unbind(&fb->c); |
| 916 | fb->feature_update = 0; |
| 917 | fb->bug_trigger = 0; |
| 918 | } |
| 919 | |
| 920 | static void fb_frontend_changed(struct XenLegacyDevice *xendev, |
| 921 | const char *node) |
| 922 | { |
| 923 | struct XenFB *fb = container_of(xendev, struct XenFB, c.xendev); |
| 924 | |
| 925 | /* |
| 926 | * Set state to Connected *again* once the frontend switched |
| 927 | * to connected. We must trigger the watch a second time to |
| 928 | * workaround a frontend bug. |
| 929 | */ |
| 930 | if (fb->bug_trigger == 0 && strcmp(node, "state") == 0 && |
| 931 | xendev->fe_state == XenbusStateConnected && |
| 932 | xendev->be_state == XenbusStateConnected) { |
| 933 | xen_pv_printf(xendev, 2, "re-trigger connected (frontend bug)\n"); |
| 934 | xen_be_set_state(xendev, XenbusStateConnected); |
| 935 | fb->bug_trigger = 1; /* only once */ |
| 936 | } |
| 937 | } |
| 938 | |
| 939 | static void fb_event(struct XenLegacyDevice *xendev) |
| 940 | { |
| 941 | struct XenFB *xenfb = container_of(xendev, struct XenFB, c.xendev); |
| 942 | |
| 943 | xenfb_handle_events(xenfb); |
| 944 | xen_pv_send_notify(&xenfb->c.xendev); |
| 945 | } |
| 946 | |
| 947 | /* -------------------------------------------------------------------- */ |
| 948 | |
| 949 | static const struct XenDevOps xen_kbdmouse_ops = { |
| 950 | .size = sizeof(struct XenInput), |
| 951 | .init = input_init, |
| 952 | .initialise = input_initialise, |
| 953 | .connected = input_connected, |
| 954 | .disconnect = input_disconnect, |
| 955 | .event = input_event, |
| 956 | }; |
| 957 | |
| 958 | const struct XenDevOps xen_framebuffer_ops = { |
| 959 | .size = sizeof(struct XenFB), |
| 960 | .init = fb_init, |
| 961 | .initialise = fb_initialise, |
| 962 | .disconnect = fb_disconnect, |
| 963 | .event = fb_event, |
| 964 | .frontend_changed = fb_frontend_changed, |
| 965 | }; |
| 966 | |
| 967 | static const GraphicHwOps xenfb_ops = { |
| 968 | .invalidate = xenfb_invalidate, |
| 969 | .gfx_update = xenfb_update, |
| 970 | .ui_info = xenfb_ui_info, |
| 971 | }; |
| 972 | |
| 973 | static void xen_ui_register_backend(void) |
| 974 | { |
| 975 | xen_be_register("vkbd", &xen_kbdmouse_ops); |
| 976 | |
| 977 | if (vga_interface_type == VGA_XENFB) { |
| 978 | xen_be_register("vfb", &xen_framebuffer_ops); |
| 979 | } |
| 980 | } |
| 981 | xen_backend_init(xen_ui_register_backend); |