2 * Copyright (c) 2000 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/pci/agp.c,v 1.3.2.4 2002/08/11 19:58:12 alc Exp $
27 * $DragonFly: src/sys/dev/agp/agp.c,v 1.7 2003/08/07 21:16:48 dillon Exp $
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
36 #include <sys/kernel.h>
39 #include <sys/ioccom.h>
40 #include <sys/agpio.h>
44 #include <bus/pci/pcivar.h>
45 #include <bus/pci/pcireg.h>
51 #include <vm/vm_object.h>
52 #include <vm/vm_page.h>
53 #include <vm/vm_pageout.h>
56 #include <machine/md_var.h>
57 #include <machine/bus.h>
58 #include <machine/resource.h>
61 MODULE_VERSION(agp, 1);
63 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
65 #define CDEV_MAJOR 148
67 static d_open_t agp_open;
68 static d_close_t agp_close;
69 static d_ioctl_t agp_ioctl;
70 static d_mmap_t agp_mmap;
72 static struct cdevsw agp_cdevsw = {
80 /* close */ agp_close,
83 /* ioctl */ agp_ioctl,
86 /* strategy */ nostrategy,
91 static devclass_t agp_devclass;
92 #define KDEV2DEV(kdev) devclass_get_device(agp_devclass, minor(kdev))
94 /* Helper functions for implementing chipset mini drivers. */
105 agp_find_caps(device_t dev)
111 * Check the CAP_LIST bit of the PCI status register first.
113 status = pci_read_config(dev, PCIR_STATUS, 2);
114 if (!(status & 0x10))
118 * Traverse the capabilities list.
120 for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
123 u_int32_t capid = pci_read_config(dev, ptr, 4);
124 next = AGP_CAPID_GET_NEXT_PTR(capid);
127 * If this capability entry ID is 2, then we are done.
129 if (AGP_CAPID_GET_CAP_ID(capid) == 2)
137 * Find an AGP display device (if any).
140 agp_find_display(void)
142 devclass_t pci = devclass_find("pci");
143 device_t bus, dev = 0;
145 int busnum, numkids, i;
147 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
148 bus = devclass_get_device(pci, busnum);
151 device_get_children(bus, &kids, &numkids);
152 for (i = 0; i < numkids; i++) {
154 if (pci_get_class(dev) == PCIC_DISPLAY
155 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
156 if (agp_find_caps(dev)) {
169 agp_alloc_gatt(device_t dev)
171 u_int32_t apsize = AGP_GET_APERTURE(dev);
172 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
173 struct agp_gatt *gatt;
177 "allocating GATT for aperture of size %dM\n",
178 apsize / (1024*1024));
180 gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
184 gatt->ag_entries = entries;
185 gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
186 0, ~0, PAGE_SIZE, 0);
187 if (!gatt->ag_virtual) {
189 device_printf(dev, "contiguous allocation failed\n");
193 bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
194 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
201 agp_free_gatt(struct agp_gatt *gatt)
203 contigfree(gatt->ag_virtual,
204 gatt->ag_entries * sizeof(u_int32_t), M_AGP);
208 static int agp_max[][2] = {
219 #define agp_max_size (sizeof(agp_max) / sizeof(agp_max[0]))
222 agp_generic_attach(device_t dev)
224 struct agp_softc *sc = device_get_softc(dev);
228 * Find and map the aperture.
231 sc->as_aperture = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
232 0, ~0, 1, RF_ACTIVE);
233 if (!sc->as_aperture)
237 * Work out an upper bound for agp memory allocation. This
238 * uses a heurisitc table from the Linux driver.
240 memsize = ptoa(Maxmem) >> 20;
241 for (i = 0; i < agp_max_size; i++) {
242 if (memsize <= agp_max[i][0])
245 if (i == agp_max_size) i = agp_max_size - 1;
246 sc->as_maxmem = agp_max[i][1] << 20U;
249 * The lock is used to prevent re-entry to
250 * agp_generic_bind_memory() since that function can sleep.
252 lockinit(&sc->as_lock, PCATCH, "agplk", 0, 0);
255 * Initialise stuff for the userland device.
257 agp_devclass = devclass_find("agp");
258 TAILQ_INIT(&sc->as_memory);
261 sc->as_devnode = make_dev(&agp_cdevsw,
262 device_get_unit(dev),
272 agp_generic_detach(device_t dev)
274 struct agp_softc *sc = device_get_softc(dev);
275 bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
276 lockmgr(&sc->as_lock, LK_DRAIN, 0, curthread); /* XXX */
277 destroy_dev(sc->as_devnode);
283 agp_generic_enable(device_t dev, u_int32_t mode)
285 device_t mdev = agp_find_display();
286 u_int32_t tstatus, mstatus;
288 int rq, sba, fw, rate;;
291 AGP_DPF("can't find display\n");
295 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
296 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
298 /* Set RQ to the min of mode, tstatus and mstatus */
299 rq = AGP_MODE_GET_RQ(mode);
300 if (AGP_MODE_GET_RQ(tstatus) < rq)
301 rq = AGP_MODE_GET_RQ(tstatus);
302 if (AGP_MODE_GET_RQ(mstatus) < rq)
303 rq = AGP_MODE_GET_RQ(mstatus);
305 /* Set SBA if all three can deal with SBA */
306 sba = (AGP_MODE_GET_SBA(tstatus)
307 & AGP_MODE_GET_SBA(mstatus)
308 & AGP_MODE_GET_SBA(mode));
311 fw = (AGP_MODE_GET_FW(tstatus)
312 & AGP_MODE_GET_FW(mstatus)
313 & AGP_MODE_GET_FW(mode));
315 /* Figure out the max rate */
316 rate = (AGP_MODE_GET_RATE(tstatus)
317 & AGP_MODE_GET_RATE(mstatus)
318 & AGP_MODE_GET_RATE(mode));
319 if (rate & AGP_MODE_RATE_4x)
320 rate = AGP_MODE_RATE_4x;
321 else if (rate & AGP_MODE_RATE_2x)
322 rate = AGP_MODE_RATE_2x;
324 rate = AGP_MODE_RATE_1x;
326 /* Construct the new mode word and tell the hardware */
327 command = AGP_MODE_SET_RQ(0, rq);
328 command = AGP_MODE_SET_SBA(command, sba);
329 command = AGP_MODE_SET_FW(command, fw);
330 command = AGP_MODE_SET_RATE(command, rate);
331 command = AGP_MODE_SET_AGP(command, 1);
332 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
333 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
339 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
341 struct agp_softc *sc = device_get_softc(dev);
342 struct agp_memory *mem;
344 if ((size & (AGP_PAGE_SIZE - 1)) != 0)
347 if (sc->as_allocated + size > sc->as_maxmem)
351 printf("agp_generic_alloc_memory: unsupported type %d\n",
356 mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
357 mem->am_id = sc->as_nextid++;
360 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
361 mem->am_physical = 0;
363 mem->am_is_bound = 0;
364 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
365 sc->as_allocated += size;
371 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
373 struct agp_softc *sc = device_get_softc(dev);
375 if (mem->am_is_bound)
378 sc->as_allocated -= mem->am_size;
379 TAILQ_REMOVE(&sc->as_memory, mem, am_link);
380 vm_object_deallocate(mem->am_obj);
386 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
389 struct agp_softc *sc = device_get_softc(dev);
394 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread); /* XXX */
396 if (mem->am_is_bound) {
397 device_printf(dev, "memory already bound\n");
402 || (offset & (AGP_PAGE_SIZE - 1)) != 0
403 || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
404 device_printf(dev, "binding memory at bad offset %#x\n",
410 * Bind the individual pages and flush the chipset's
413 * XXX Presumably, this needs to be the pci address on alpha
414 * (i.e. use alpha_XXX_dmamap()). I don't have access to any
415 * alpha AGP hardware to check.
417 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
419 * Find a page from the object and wire it
420 * down. This page will be mapped using one or more
421 * entries in the GATT (assuming that PAGE_SIZE >=
422 * AGP_PAGE_SIZE. If this is the first call to bind,
423 * the pages will be allocated and zeroed.
425 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
426 VM_ALLOC_ZERO | VM_ALLOC_RETRY);
427 if ((m->flags & PG_ZERO) == 0)
428 vm_page_zero_fill(m);
429 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
433 * Install entries in the GATT, making sure that if
434 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
435 * aligned to PAGE_SIZE, we don't modify too many GATT
438 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
439 j += AGP_PAGE_SIZE) {
440 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
441 AGP_DPF("binding offset %#x to pa %#x\n",
443 error = AGP_BIND_PAGE(dev, offset + i + j, pa);
446 * Bail out. Reverse all the mappings
447 * and unwire the pages.
450 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
451 AGP_UNBIND_PAGE(dev, offset + k);
452 for (k = 0; k <= i; k += PAGE_SIZE) {
453 m = vm_page_lookup(mem->am_obj,
455 vm_page_unwire(m, 0);
457 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread); /* XXX */
465 * Flush the cpu cache since we are providing a new mapping
471 * Make sure the chipset gets the new mappings.
475 mem->am_offset = offset;
476 mem->am_is_bound = 1;
478 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread); /* XXX */
484 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
486 struct agp_softc *sc = device_get_softc(dev);
490 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread); /* XXX */
492 if (!mem->am_is_bound) {
493 device_printf(dev, "memory is not bound\n");
499 * Unbind the individual pages and flush the chipset's
500 * TLB. Unwire the pages so they can be swapped.
502 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
503 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
504 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
505 m = vm_page_lookup(mem->am_obj, atop(i));
506 vm_page_unwire(m, 0);
513 mem->am_is_bound = 0;
515 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread); /* XXX */
520 /* Helper functions for implementing user/kernel api */
523 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
525 struct agp_softc *sc = device_get_softc(dev);
527 if (sc->as_state != AGP_ACQUIRE_FREE)
529 sc->as_state = state;
535 agp_release_helper(device_t dev, enum agp_acquire_state state)
537 struct agp_softc *sc = device_get_softc(dev);
539 if (sc->as_state == AGP_ACQUIRE_FREE)
542 if (sc->as_state != state)
545 sc->as_state = AGP_ACQUIRE_FREE;
549 static struct agp_memory *
550 agp_find_memory(device_t dev, int id)
552 struct agp_softc *sc = device_get_softc(dev);
553 struct agp_memory *mem;
555 AGP_DPF("searching for memory block %d\n", id);
556 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
557 AGP_DPF("considering memory block %d\n", mem->am_id);
558 if (mem->am_id == id)
564 /* Implementation of the userland ioctl api */
567 agp_info_user(device_t dev, agp_info *info)
569 struct agp_softc *sc = device_get_softc(dev);
571 bzero(info, sizeof *info);
572 info->bridge_id = pci_get_devid(dev);
574 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
575 info->aper_base = rman_get_start(sc->as_aperture);
576 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
577 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
578 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
584 agp_setup_user(device_t dev, agp_setup *setup)
586 return AGP_ENABLE(dev, setup->agp_mode);
590 agp_allocate_user(device_t dev, agp_allocate *alloc)
592 struct agp_memory *mem;
594 mem = AGP_ALLOC_MEMORY(dev,
596 alloc->pg_count << AGP_PAGE_SHIFT);
598 alloc->key = mem->am_id;
599 alloc->physical = mem->am_physical;
607 agp_deallocate_user(device_t dev, int id)
609 struct agp_memory *mem = agp_find_memory(dev, id);;
612 AGP_FREE_MEMORY(dev, mem);
620 agp_bind_user(device_t dev, agp_bind *bind)
622 struct agp_memory *mem = agp_find_memory(dev, bind->key);
627 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
631 agp_unbind_user(device_t dev, agp_unbind *unbind)
633 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
638 return AGP_UNBIND_MEMORY(dev, mem);
642 agp_open(dev_t kdev, int oflags, int devtype, struct thread *td)
644 device_t dev = KDEV2DEV(kdev);
645 struct agp_softc *sc = device_get_softc(dev);
647 if (!sc->as_isopen) {
656 agp_close(dev_t kdev, int fflag, int devtype, struct thread *td)
658 device_t dev = KDEV2DEV(kdev);
659 struct agp_softc *sc = device_get_softc(dev);
660 struct agp_memory *mem;
663 * Clear the GATT and force release on last close
665 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
666 if (mem->am_is_bound)
667 AGP_UNBIND_MEMORY(dev, mem);
668 AGP_FREE_MEMORY(dev, mem);
670 if (sc->as_state == AGP_ACQUIRE_USER)
671 agp_release_helper(dev, AGP_ACQUIRE_USER);
679 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
681 device_t dev = KDEV2DEV(kdev);
685 return agp_info_user(dev, (agp_info *) data);
688 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
691 return agp_release_helper(dev, AGP_ACQUIRE_USER);
694 return agp_setup_user(dev, (agp_setup *)data);
696 case AGPIOC_ALLOCATE:
697 return agp_allocate_user(dev, (agp_allocate *)data);
699 case AGPIOC_DEALLOCATE:
700 return agp_deallocate_user(dev, *(int *) data);
703 return agp_bind_user(dev, (agp_bind *)data);
706 return agp_unbind_user(dev, (agp_unbind *)data);
714 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
716 device_t dev = KDEV2DEV(kdev);
717 struct agp_softc *sc = device_get_softc(dev);
719 if (offset > AGP_GET_APERTURE(dev))
721 return atop(rman_get_start(sc->as_aperture) + offset);
724 /* Implementation of the kernel api */
731 return devclass_get_device(agp_devclass, 0);
734 enum agp_acquire_state
735 agp_state(device_t dev)
737 struct agp_softc *sc = device_get_softc(dev);
742 agp_get_info(device_t dev, struct agp_info *info)
744 struct agp_softc *sc = device_get_softc(dev);
747 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
748 info->ai_aperture_base = rman_get_start(sc->as_aperture);
749 info->ai_aperture_size = (rman_get_end(sc->as_aperture)
750 - rman_get_start(sc->as_aperture)) + 1;
751 info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
752 info->ai_memory_allowed = sc->as_maxmem;
753 info->ai_memory_used = sc->as_allocated;
757 agp_acquire(device_t dev)
759 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
763 agp_release(device_t dev)
765 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
769 agp_enable(device_t dev, u_int32_t mode)
771 return AGP_ENABLE(dev, mode);
774 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
776 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
779 void agp_free_memory(device_t dev, void *handle)
781 struct agp_memory *mem = (struct agp_memory *) handle;
782 AGP_FREE_MEMORY(dev, mem);
785 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
787 struct agp_memory *mem = (struct agp_memory *) handle;
788 return AGP_BIND_MEMORY(dev, mem, offset);
791 int agp_unbind_memory(device_t dev, void *handle)
793 struct agp_memory *mem = (struct agp_memory *) handle;
794 return AGP_UNBIND_MEMORY(dev, mem);
797 void agp_memory_info(device_t dev, void *handle, struct
800 struct agp_memory *mem = (struct agp_memory *) handle;
802 mi->ami_size = mem->am_size;
803 mi->ami_physical = mem->am_physical;
804 mi->ami_offset = mem->am_offset;
805 mi->ami_is_bound = mem->am_is_bound;