FreeBSD/Linux Kernel Cross Reference
sys/dev/agp/agp.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2000 Doug Rabson
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include "opt_agp.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/malloc.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/bus.h>
40 #include <sys/conf.h>
41 #include <sys/ioccom.h>
42 #include <sys/agpio.h>
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <sys/proc.h>
46 #include <sys/rwlock.h>
47
48 #include <dev/agp/agppriv.h>
49 #include <dev/agp/agpvar.h>
50 #include <dev/agp/agpreg.h>
51 #include <dev/pci/pcivar.h>
52 #include <dev/pci/pcireg.h>
53
54 #include <vm/vm.h>
55 #include <vm/vm_extern.h>
56 #include <vm/vm_kern.h>
57 #include <vm/vm_param.h>
58 #include <vm/vm_object.h>
59 #include <vm/vm_page.h>
60 #include <vm/vm_pageout.h>
61 #include <vm/pmap.h>
62
63 #include <machine/bus.h>
64 #include <machine/resource.h>
65 #include <sys/rman.h>
66
67 MODULE_VERSION(agp, 1);
68
69 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
70
71 /* agp_drv.c */
72 static d_open_t agp_open;
73 static d_close_t agp_close;
74 static d_ioctl_t agp_ioctl;
75 static d_mmap_t agp_mmap;
76
77 static struct cdevsw agp_cdevsw = {
78 .d_version = D_VERSION,
79 .d_flags = D_NEEDGIANT,
80 .d_open = agp_open,
81 .d_close = agp_close,
82 .d_ioctl = agp_ioctl,
83 .d_mmap = agp_mmap,
84 .d_name = "agp",
85 };
86
87 static devclass_t agp_devclass;
88
89 /* Helper functions for implementing chipset mini drivers. */
90
91 u_int8_t
92 agp_find_caps(device_t dev)
93 {
94 int capreg;
95
96 if (pci_find_cap(dev, PCIY_AGP, &capreg) != 0)
97 capreg = 0;
98 return (capreg);
99 }
100
101 /*
102 * Find an AGP display device (if any).
103 */
104 static device_t
105 agp_find_display(void)
106 {
107 devclass_t pci = devclass_find("pci");
108 device_t bus, dev = 0;
109 device_t *kids;
110 int busnum, numkids, i;
111
112 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
113 bus = devclass_get_device(pci, busnum);
114 if (!bus)
115 continue;
116 if (device_get_children(bus, &kids, &numkids) != 0)
117 continue;
118 for (i = 0; i < numkids; i++) {
119 dev = kids[i];
120 if (pci_get_class(dev) == PCIC_DISPLAY
121 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
122 if (agp_find_caps(dev)) {
123 free(kids, M_TEMP);
124 return dev;
125 }
126
127 }
128 free(kids, M_TEMP);
129 }
130
131 return 0;
132 }
133
134 struct agp_gatt *
135 agp_alloc_gatt(device_t dev)
136 {
137 u_int32_t apsize = AGP_GET_APERTURE(dev);
138 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
139 struct agp_gatt *gatt;
140
141 if (bootverbose)
142 device_printf(dev,
143 "allocating GATT for aperture of size %dM\n",
144 apsize / (1024*1024));
145
146 if (entries == 0) {
147 device_printf(dev, "bad aperture size\n");
148 return NULL;
149 }
150
151 gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
152 if (!gatt)
153 return 0;
154
155 gatt->ag_entries = entries;
156 gatt->ag_virtual = (void *)kmem_alloc_contig(entries *
157 sizeof(u_int32_t), M_NOWAIT | M_ZERO, 0, ~0, PAGE_SIZE, 0,
158 VM_MEMATTR_WRITE_COMBINING);
159 if (!gatt->ag_virtual) {
160 if (bootverbose)
161 device_printf(dev, "contiguous allocation failed\n");
162 free(gatt, M_AGP);
163 return 0;
164 }
165 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
166
167 return gatt;
168 }
169
170 void
171 agp_free_gatt(struct agp_gatt *gatt)
172 {
173 kmem_free((vm_offset_t)gatt->ag_virtual, gatt->ag_entries *
174 sizeof(u_int32_t));
175 free(gatt, M_AGP);
176 }
177
178 static u_int agp_max[][2] = {
179 {0, 0},
180 {32, 4},
181 {64, 28},
182 {128, 96},
183 {256, 204},
184 {512, 440},
185 {1024, 942},
186 {2048, 1920},
187 {4096, 3932}
188 };
189 #define AGP_MAX_SIZE nitems(agp_max)
190
191 /**
192 * Sets the PCI resource which represents the AGP aperture.
193 *
194 * If not called, the default AGP aperture resource of AGP_APBASE will
195 * be used. Must be called before agp_generic_attach().
196 */
197 void
198 agp_set_aperture_resource(device_t dev, int rid)
199 {
200 struct agp_softc *sc = device_get_softc(dev);
201
202 sc->as_aperture_rid = rid;
203 }
204
205 int
206 agp_generic_attach(device_t dev)
207 {
208 struct agp_softc *sc = device_get_softc(dev);
209 int i;
210 u_int memsize;
211
212 /*
213 * Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE
214 * because the kernel doesn't need to map it.
215 */
216
217 if (sc->as_aperture_rid != -1) {
218 if (sc->as_aperture_rid == 0)
219 sc->as_aperture_rid = AGP_APBASE;
220
221 sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
222 &sc->as_aperture_rid, RF_SHAREABLE);
223 if (!sc->as_aperture)
224 return ENOMEM;
225 }
226
227 /*
228 * Work out an upper bound for agp memory allocation. This
229 * uses a heurisitc table from the Linux driver.
230 */
231 memsize = ptoa(realmem) >> 20;
232 for (i = 0; i < AGP_MAX_SIZE; i++) {
233 if (memsize <= agp_max[i][0])
234 break;
235 }
236 if (i == AGP_MAX_SIZE)
237 i = AGP_MAX_SIZE - 1;
238 sc->as_maxmem = agp_max[i][1] << 20U;
239
240 /*
241 * The lock is used to prevent re-entry to
242 * agp_generic_bind_memory() since that function can sleep.
243 */
244 mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
245
246 /*
247 * Initialise stuff for the userland device.
248 */
249 agp_devclass = devclass_find("agp");
250 TAILQ_INIT(&sc->as_memory);
251 sc->as_nextid = 1;
252
253 sc->as_devnode = make_dev(&agp_cdevsw,
254 0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
255 sc->as_devnode->si_drv1 = dev;
256
257 return 0;
258 }
259
260 void
261 agp_free_cdev(device_t dev)
262 {
263 struct agp_softc *sc = device_get_softc(dev);
264
265 destroy_dev(sc->as_devnode);
266 }
267
268 void
269 agp_free_res(device_t dev)
270 {
271 struct agp_softc *sc = device_get_softc(dev);
272
273 if (sc->as_aperture != NULL)
274 bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
275 sc->as_aperture);
276 mtx_destroy(&sc->as_lock);
277 }
278
279 int
280 agp_generic_detach(device_t dev)
281 {
282
283 agp_free_cdev(dev);
284 agp_free_res(dev);
285 return 0;
286 }
287
288 /**
289 * Default AGP aperture size detection which simply returns the size of
290 * the aperture's PCI resource.
291 */
292 u_int32_t
293 agp_generic_get_aperture(device_t dev)
294 {
295 struct agp_softc *sc = device_get_softc(dev);
296
297 return rman_get_size(sc->as_aperture);
298 }
299
300 /**
301 * Default AGP aperture size setting function, which simply doesn't allow
302 * changes to resource size.
303 */
304 int
305 agp_generic_set_aperture(device_t dev, u_int32_t aperture)
306 {
307 u_int32_t current_aperture;
308
309 current_aperture = AGP_GET_APERTURE(dev);
310 if (current_aperture != aperture)
311 return EINVAL;
312 else
313 return 0;
314 }
315
316 /*
317 * This does the enable logic for v3, with the same topology
318 * restrictions as in place for v2 -- one bus, one device on the bus.
319 */
320 static int
321 agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
322 {
323 u_int32_t tstatus, mstatus;
324 u_int32_t command;
325 int rq, sba, fw, rate, arqsz, cal;
326
327 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
328 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
329
330 /* Set RQ to the min of mode, tstatus and mstatus */
331 rq = AGP_MODE_GET_RQ(mode);
332 if (AGP_MODE_GET_RQ(tstatus) < rq)
333 rq = AGP_MODE_GET_RQ(tstatus);
334 if (AGP_MODE_GET_RQ(mstatus) < rq)
335 rq = AGP_MODE_GET_RQ(mstatus);
336
337 /*
338 * ARQSZ - Set the value to the maximum one.
339 * Don't allow the mode register to override values.
340 */
341 arqsz = AGP_MODE_GET_ARQSZ(mode);
342 if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
343 rq = AGP_MODE_GET_ARQSZ(tstatus);
344 if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
345 rq = AGP_MODE_GET_ARQSZ(mstatus);
346
347 /* Calibration cycle - don't allow override by mode register */
348 cal = AGP_MODE_GET_CAL(tstatus);
349 if (AGP_MODE_GET_CAL(mstatus) < cal)
350 cal = AGP_MODE_GET_CAL(mstatus);
351
352 /* SBA must be supported for AGP v3. */
353 sba = 1;
354
355 /* Set FW if all three support it. */
356 fw = (AGP_MODE_GET_FW(tstatus)
357 & AGP_MODE_GET_FW(mstatus)
358 & AGP_MODE_GET_FW(mode));
359
360 /* Figure out the max rate */
361 rate = (AGP_MODE_GET_RATE(tstatus)
362 & AGP_MODE_GET_RATE(mstatus)
363 & AGP_MODE_GET_RATE(mode));
364 if (rate & AGP_MODE_V3_RATE_8x)
365 rate = AGP_MODE_V3_RATE_8x;
366 else
367 rate = AGP_MODE_V3_RATE_4x;
368 if (bootverbose)
369 device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
370
371 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
372
373 /* Construct the new mode word and tell the hardware */
374 command = 0;
375 command = AGP_MODE_SET_RQ(0, rq);
376 command = AGP_MODE_SET_ARQSZ(command, arqsz);
377 command = AGP_MODE_SET_CAL(command, cal);
378 command = AGP_MODE_SET_SBA(command, sba);
379 command = AGP_MODE_SET_FW(command, fw);
380 command = AGP_MODE_SET_RATE(command, rate);
381 command = AGP_MODE_SET_MODE_3(command, 1);
382 command = AGP_MODE_SET_AGP(command, 1);
383 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
384 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
385
386 return 0;
387 }
388
389 static int
390 agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
391 {
392 u_int32_t tstatus, mstatus;
393 u_int32_t command;
394 int rq, sba, fw, rate;
395
396 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
397 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
398
399 /* Set RQ to the min of mode, tstatus and mstatus */
400 rq = AGP_MODE_GET_RQ(mode);
401 if (AGP_MODE_GET_RQ(tstatus) < rq)
402 rq = AGP_MODE_GET_RQ(tstatus);
403 if (AGP_MODE_GET_RQ(mstatus) < rq)
404 rq = AGP_MODE_GET_RQ(mstatus);
405
406 /* Set SBA if all three can deal with SBA */
407 sba = (AGP_MODE_GET_SBA(tstatus)
408 & AGP_MODE_GET_SBA(mstatus)
409 & AGP_MODE_GET_SBA(mode));
410
411 /* Similar for FW */
412 fw = (AGP_MODE_GET_FW(tstatus)
413 & AGP_MODE_GET_FW(mstatus)
414 & AGP_MODE_GET_FW(mode));
415
416 /* Figure out the max rate */
417 rate = (AGP_MODE_GET_RATE(tstatus)
418 & AGP_MODE_GET_RATE(mstatus)
419 & AGP_MODE_GET_RATE(mode));
420 if (rate & AGP_MODE_V2_RATE_4x)
421 rate = AGP_MODE_V2_RATE_4x;
422 else if (rate & AGP_MODE_V2_RATE_2x)
423 rate = AGP_MODE_V2_RATE_2x;
424 else
425 rate = AGP_MODE_V2_RATE_1x;
426 if (bootverbose)
427 device_printf(dev, "Setting AGP v2 mode %d\n", rate);
428
429 /* Construct the new mode word and tell the hardware */
430 command = 0;
431 command = AGP_MODE_SET_RQ(0, rq);
432 command = AGP_MODE_SET_SBA(command, sba);
433 command = AGP_MODE_SET_FW(command, fw);
434 command = AGP_MODE_SET_RATE(command, rate);
435 command = AGP_MODE_SET_AGP(command, 1);
436 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
437 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
438
439 return 0;
440 }
441
442 int
443 agp_generic_enable(device_t dev, u_int32_t mode)
444 {
445 device_t mdev = agp_find_display();
446 u_int32_t tstatus, mstatus;
447
448 if (!mdev) {
449 AGP_DPF("can't find display\n");
450 return ENXIO;
451 }
452
453 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
454 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
455
456 /*
457 * Check display and bridge for AGP v3 support. AGP v3 allows
458 * more variety in topology than v2, e.g. multiple AGP devices
459 * attached to one bridge, or multiple AGP bridges in one
460 * system. This doesn't attempt to address those situations,
461 * but should work fine for a classic single AGP slot system
462 * with AGP v3.
463 */
464 if (AGP_MODE_GET_MODE_3(mode) &&
465 AGP_MODE_GET_MODE_3(tstatus) &&
466 AGP_MODE_GET_MODE_3(mstatus))
467 return (agp_v3_enable(dev, mdev, mode));
468 else
469 return (agp_v2_enable(dev, mdev, mode));
470 }
471
472 struct agp_memory *
473 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
474 {
475 struct agp_softc *sc = device_get_softc(dev);
476 struct agp_memory *mem;
477
478 if ((size & (AGP_PAGE_SIZE - 1)) != 0)
479 return 0;
480
481 if (size > sc->as_maxmem - sc->as_allocated)
482 return 0;
483
484 if (type != 0) {
485 printf("agp_generic_alloc_memory: unsupported type %d\n",
486 type);
487 return 0;
488 }
489
490 mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
491 mem->am_id = sc->as_nextid++;
492 mem->am_size = size;
493 mem->am_type = 0;
494 mem->am_obj = vm_object_allocate(OBJT_SWAP, atop(round_page(size)));
495 mem->am_physical = 0;
496 mem->am_offset = 0;
497 mem->am_is_bound = 0;
498 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
499 sc->as_allocated += size;
500
501 return mem;
502 }
503
504 int
505 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
506 {
507 struct agp_softc *sc = device_get_softc(dev);
508
509 if (mem->am_is_bound)
510 return EBUSY;
511
512 sc->as_allocated -= mem->am_size;
513 TAILQ_REMOVE(&sc->as_memory, mem, am_link);
514 vm_object_deallocate(mem->am_obj);
515 free(mem, M_AGP);
516 return 0;
517 }
518
519 int
520 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
521 vm_offset_t offset)
522 {
523 struct agp_softc *sc = device_get_softc(dev);
524 vm_offset_t i, j, k;
525 vm_page_t m;
526 int error;
527
528 /* Do some sanity checks first. */
529 if ((offset & (AGP_PAGE_SIZE - 1)) != 0 ||
530 offset + mem->am_size > AGP_GET_APERTURE(dev)) {
531 device_printf(dev, "binding memory at bad offset %#x\n",
532 (int)offset);
533 return EINVAL;
534 }
535
536 /*
537 * Allocate the pages early, before acquiring the lock,
538 * because vm_page_grab() may sleep and we can't hold a mutex
539 * while sleeping.
540 */
541 VM_OBJECT_WLOCK(mem->am_obj);
542 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
543 /*
544 * Find a page from the object and wire it
545 * down. This page will be mapped using one or more
546 * entries in the GATT (assuming that PAGE_SIZE >=
547 * AGP_PAGE_SIZE. If this is the first call to bind,
548 * the pages will be allocated and zeroed.
549 */
550 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
551 VM_ALLOC_WIRED | VM_ALLOC_ZERO);
552 AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
553 }
554 VM_OBJECT_WUNLOCK(mem->am_obj);
555
556 mtx_lock(&sc->as_lock);
557
558 if (mem->am_is_bound) {
559 device_printf(dev, "memory already bound\n");
560 error = EINVAL;
561 VM_OBJECT_WLOCK(mem->am_obj);
562 i = 0;
563 goto bad;
564 }
565
566 /*
567 * Bind the individual pages and flush the chipset's
568 * TLB.
569 */
570 VM_OBJECT_WLOCK(mem->am_obj);
571 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
572 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
573
574 /*
575 * Install entries in the GATT, making sure that if
576 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
577 * aligned to PAGE_SIZE, we don't modify too many GATT
578 * entries.
579 */
580 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
581 j += AGP_PAGE_SIZE) {
582 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
583 AGP_DPF("binding offset %#jx to pa %#jx\n",
584 (uintmax_t)offset + i + j, (uintmax_t)pa);
585 error = AGP_BIND_PAGE(dev, offset + i + j, pa);
586 if (error) {
587 /*
588 * Bail out. Reverse all the mappings
589 * and unwire the pages.
590 */
591 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
592 AGP_UNBIND_PAGE(dev, offset + k);
593 goto bad;
594 }
595 }
596 vm_page_xunbusy(m);
597 }
598 VM_OBJECT_WUNLOCK(mem->am_obj);
599
600 /*
601 * Make sure the chipset gets the new mappings.
602 */
603 AGP_FLUSH_TLB(dev);
604
605 mem->am_offset = offset;
606 mem->am_is_bound = 1;
607
608 mtx_unlock(&sc->as_lock);
609
610 return 0;
611 bad:
612 mtx_unlock(&sc->as_lock);
613 VM_OBJECT_ASSERT_WLOCKED(mem->am_obj);
614 for (k = 0; k < mem->am_size; k += PAGE_SIZE) {
615 m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(k));
616 if (k >= i)
617 vm_page_xunbusy(m);
618 vm_page_unwire(m, PQ_INACTIVE);
619 }
620 VM_OBJECT_WUNLOCK(mem->am_obj);
621
622 return error;
623 }
624
625 int
626 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
627 {
628 struct agp_softc *sc = device_get_softc(dev);
629 vm_page_t m;
630 int i;
631
632 mtx_lock(&sc->as_lock);
633
634 if (!mem->am_is_bound) {
635 device_printf(dev, "memory is not bound\n");
636 mtx_unlock(&sc->as_lock);
637 return EINVAL;
638 }
639
640 /*
641 * Unbind the individual pages and flush the chipset's
642 * TLB. Unwire the pages so they can be swapped.
643 */
644 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
645 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
646
647 AGP_FLUSH_TLB(dev);
648
649 VM_OBJECT_WLOCK(mem->am_obj);
650 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
651 m = vm_page_lookup(mem->am_obj, atop(i));
652 vm_page_unwire(m, PQ_INACTIVE);
653 }
654 VM_OBJECT_WUNLOCK(mem->am_obj);
655
656 mem->am_offset = 0;
657 mem->am_is_bound = 0;
658
659 mtx_unlock(&sc->as_lock);
660
661 return 0;
662 }
663
664 /* Helper functions for implementing user/kernel api */
665
666 static int
667 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
668 {
669 struct agp_softc *sc = device_get_softc(dev);
670
671 if (sc->as_state != AGP_ACQUIRE_FREE)
672 return EBUSY;
673 sc->as_state = state;
674
675 return 0;
676 }
677
678 static int
679 agp_release_helper(device_t dev, enum agp_acquire_state state)
680 {
681 struct agp_softc *sc = device_get_softc(dev);
682
683 if (sc->as_state == AGP_ACQUIRE_FREE)
684 return 0;
685
686 if (sc->as_state != state)
687 return EBUSY;
688
689 sc->as_state = AGP_ACQUIRE_FREE;
690 return 0;
691 }
692
693 static struct agp_memory *
694 agp_find_memory(device_t dev, int id)
695 {
696 struct agp_softc *sc = device_get_softc(dev);
697 struct agp_memory *mem;
698
699 AGP_DPF("searching for memory block %d\n", id);
700 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
701 AGP_DPF("considering memory block %d\n", mem->am_id);
702 if (mem->am_id == id)
703 return mem;
704 }
705 return 0;
706 }
707
708 /* Implementation of the userland ioctl api */
709
710 static int
711 agp_info_user(device_t dev, agp_info *info)
712 {
713 struct agp_softc *sc = device_get_softc(dev);
714
715 bzero(info, sizeof *info);
716 info->bridge_id = pci_get_devid(dev);
717 info->agp_mode =
718 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
719 if (sc->as_aperture)
720 info->aper_base = rman_get_start(sc->as_aperture);
721 else
722 info->aper_base = 0;
723 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
724 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
725 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
726
727 return 0;
728 }
729
730 static int
731 agp_setup_user(device_t dev, agp_setup *setup)
732 {
733 return AGP_ENABLE(dev, setup->agp_mode);
734 }
735
736 static int
737 agp_allocate_user(device_t dev, agp_allocate *alloc)
738 {
739 struct agp_memory *mem;
740
741 mem = AGP_ALLOC_MEMORY(dev,
742 alloc->type,
743 alloc->pg_count << AGP_PAGE_SHIFT);
744 if (mem) {
745 alloc->key = mem->am_id;
746 alloc->physical = mem->am_physical;
747 return 0;
748 } else {
749 return ENOMEM;
750 }
751 }
752
753 static int
754 agp_deallocate_user(device_t dev, int id)
755 {
756 struct agp_memory *mem = agp_find_memory(dev, id);
757
758 if (mem) {
759 AGP_FREE_MEMORY(dev, mem);
760 return 0;
761 } else {
762 return ENOENT;
763 }
764 }
765
766 static int
767 agp_bind_user(device_t dev, agp_bind *bind)
768 {
769 struct agp_memory *mem = agp_find_memory(dev, bind->key);
770
771 if (!mem)
772 return ENOENT;
773
774 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
775 }
776
777 static int
778 agp_unbind_user(device_t dev, agp_unbind *unbind)
779 {
780 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
781
782 if (!mem)
783 return ENOENT;
784
785 return AGP_UNBIND_MEMORY(dev, mem);
786 }
787
788 static int
789 agp_chipset_flush(device_t dev)
790 {
791
792 return (AGP_CHIPSET_FLUSH(dev));
793 }
794
795 static int
796 agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
797 {
798 device_t dev = kdev->si_drv1;
799 struct agp_softc *sc = device_get_softc(dev);
800
801 if (!sc->as_isopen) {
802 sc->as_isopen = 1;
803 device_busy(dev);
804 }
805
806 return 0;
807 }
808
809 static int
810 agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
811 {
812 device_t dev = kdev->si_drv1;
813 struct agp_softc *sc = device_get_softc(dev);
814 struct agp_memory *mem;
815
816 /*
817 * Clear the GATT and force release on last close
818 */
819 while ((mem = TAILQ_FIRST(&sc->as_memory)) != NULL) {
820 if (mem->am_is_bound)
821 AGP_UNBIND_MEMORY(dev, mem);
822 AGP_FREE_MEMORY(dev, mem);
823 }
824 if (sc->as_state == AGP_ACQUIRE_USER)
825 agp_release_helper(dev, AGP_ACQUIRE_USER);
826 sc->as_isopen = 0;
827 device_unbusy(dev);
828
829 return 0;
830 }
831
832 static int
833 agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
834 {
835 device_t dev = kdev->si_drv1;
836
837 switch (cmd) {
838 case AGPIOC_INFO:
839 return agp_info_user(dev, (agp_info *) data);
840
841 case AGPIOC_ACQUIRE:
842 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
843
844 case AGPIOC_RELEASE:
845 return agp_release_helper(dev, AGP_ACQUIRE_USER);
846
847 case AGPIOC_SETUP:
848 return agp_setup_user(dev, (agp_setup *)data);
849
850 case AGPIOC_ALLOCATE:
851 return agp_allocate_user(dev, (agp_allocate *)data);
852
853 case AGPIOC_DEALLOCATE:
854 return agp_deallocate_user(dev, *(int *) data);
855
856 case AGPIOC_BIND:
857 return agp_bind_user(dev, (agp_bind *)data);
858
859 case AGPIOC_UNBIND:
860 return agp_unbind_user(dev, (agp_unbind *)data);
861
862 case AGPIOC_CHIPSET_FLUSH:
863 return agp_chipset_flush(dev);
864 }
865
866 return EINVAL;
867 }
868
869 static int
870 agp_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
871 int prot, vm_memattr_t *memattr)
872 {
873 device_t dev = kdev->si_drv1;
874 struct agp_softc *sc = device_get_softc(dev);
875
876 if (offset > AGP_GET_APERTURE(dev))
877 return -1;
878 if (sc->as_aperture == NULL)
879 return -1;
880 *paddr = rman_get_start(sc->as_aperture) + offset;
881 return 0;
882 }
883
884 /* Implementation of the kernel api */
885
886 device_t
887 agp_find_device(void)
888 {
889 device_t *children, child;
890 int i, count;
891
892 if (!agp_devclass)
893 return NULL;
894 if (devclass_get_devices(agp_devclass, &children, &count) != 0)
895 return NULL;
896 child = NULL;
897 for (i = 0; i < count; i++) {
898 if (device_is_attached(children[i])) {
899 child = children[i];
900 break;
901 }
902 }
903 free(children, M_TEMP);
904 return child;
905 }
906
907 enum agp_acquire_state
908 agp_state(device_t dev)
909 {
910 struct agp_softc *sc = device_get_softc(dev);
911 return sc->as_state;
912 }
913
914 void
915 agp_get_info(device_t dev, struct agp_info *info)
916 {
917 struct agp_softc *sc = device_get_softc(dev);
918
919 info->ai_mode =
920 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
921 if (sc->as_aperture != NULL)
922 info->ai_aperture_base = rman_get_start(sc->as_aperture);
923 else
924 info->ai_aperture_base = 0;
925 info->ai_aperture_size = AGP_GET_APERTURE(dev);
926 info->ai_memory_allowed = sc->as_maxmem;
927 info->ai_memory_used = sc->as_allocated;
928 }
929
930 int
931 agp_acquire(device_t dev)
932 {
933 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
934 }
935
936 int
937 agp_release(device_t dev)
938 {
939 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
940 }
941
942 int
943 agp_enable(device_t dev, u_int32_t mode)
944 {
945 return AGP_ENABLE(dev, mode);
946 }
947
948 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
949 {
950 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
951 }
952
953 void agp_free_memory(device_t dev, void *handle)
954 {
955 struct agp_memory *mem = (struct agp_memory *) handle;
956 AGP_FREE_MEMORY(dev, mem);
957 }
958
959 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
960 {
961 struct agp_memory *mem = (struct agp_memory *) handle;
962 return AGP_BIND_MEMORY(dev, mem, offset);
963 }
964
965 int agp_unbind_memory(device_t dev, void *handle)
966 {
967 struct agp_memory *mem = (struct agp_memory *) handle;
968 return AGP_UNBIND_MEMORY(dev, mem);
969 }
970
971 void agp_memory_info(device_t dev, void *handle, struct
972 agp_memory_info *mi)
973 {
974 struct agp_memory *mem = (struct agp_memory *) handle;
975
976 mi->ami_size = mem->am_size;
977 mi->ami_physical = mem->am_physical;
978 mi->ami_offset = mem->am_offset;
979 mi->ami_is_bound = mem->am_is_bound;
980 }
981
982 int
983 agp_bind_pages(device_t dev, vm_page_t *pages, vm_size_t size,
984 vm_offset_t offset)
985 {
986 struct agp_softc *sc;
987 vm_offset_t i, j, k, pa;
988 vm_page_t m;
989 int error;
990
991 if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
992 (offset & (AGP_PAGE_SIZE - 1)) != 0)
993 return (EINVAL);
994
995 sc = device_get_softc(dev);
996
997 mtx_lock(&sc->as_lock);
998 for (i = 0; i < size; i += PAGE_SIZE) {
999 m = pages[OFF_TO_IDX(i)];
1000 KASSERT(vm_page_wired(m),
1001 ("agp_bind_pages: page %p hasn't been wired", m));
1002
1003 /*
1004 * Install entries in the GATT, making sure that if
1005 * AGP_PAGE_SIZE < PAGE_SIZE and size is not
1006 * aligned to PAGE_SIZE, we don't modify too many GATT
1007 * entries.
1008 */
1009 for (j = 0; j < PAGE_SIZE && i + j < size; j += AGP_PAGE_SIZE) {
1010 pa = VM_PAGE_TO_PHYS(m) + j;
1011 AGP_DPF("binding offset %#jx to pa %#jx\n",
1012 (uintmax_t)offset + i + j, (uintmax_t)pa);
1013 error = AGP_BIND_PAGE(dev, offset + i + j, pa);
1014 if (error) {
1015 /*
1016 * Bail out. Reverse all the mappings.
1017 */
1018 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
1019 AGP_UNBIND_PAGE(dev, offset + k);
1020
1021 mtx_unlock(&sc->as_lock);
1022 return (error);
1023 }
1024 }
1025 }
1026
1027 AGP_FLUSH_TLB(dev);
1028
1029 mtx_unlock(&sc->as_lock);
1030 return (0);
1031 }
1032
1033 int
1034 agp_unbind_pages(device_t dev, vm_size_t size, vm_offset_t offset)
1035 {
1036 struct agp_softc *sc;
1037 vm_offset_t i;
1038
1039 if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
1040 (offset & (AGP_PAGE_SIZE - 1)) != 0)
1041 return (EINVAL);
1042
1043 sc = device_get_softc(dev);
1044
1045 mtx_lock(&sc->as_lock);
1046 for (i = 0; i < size; i += AGP_PAGE_SIZE)
1047 AGP_UNBIND_PAGE(dev, offset + i);
1048
1049 AGP_FLUSH_TLB(dev);
1050
1051 mtx_unlock(&sc->as_lock);
1052 return (0);
1053 }
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