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
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/malloc.h>
35 #include <sys/kernel.h>
38 #include <sys/ioccom.h>
39 #include <sys/agpio.h>
41 #include <sys/lockmgr.h>
42 #include <sys/mutex.h>
45 #include <pci/pcivar.h>
46 #include <pci/pcireg.h>
47 #include <pci/agppriv.h>
48 #include <pci/agpvar.h>
49 #include <pci/agpreg.h>
52 #include <vm/vm_object.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_pageout.h>
57 #include <machine/md_var.h>
58 #include <machine/bus.h>
59 #include <machine/resource.h>
62 MODULE_VERSION(agp, 1);
64 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
66 #define CDEV_MAJOR 148
68 static d_open_t agp_open;
69 static d_close_t agp_close;
70 static d_ioctl_t agp_ioctl;
71 static d_mmap_t agp_mmap;
73 static struct cdevsw agp_cdevsw = {
75 /* close */ agp_close,
78 /* ioctl */ agp_ioctl,
81 /* strategy */ nostrategy,
89 static devclass_t agp_devclass;
90 #define KDEV2DEV(kdev) devclass_get_device(agp_devclass, minor(kdev))
92 /* Helper functions for implementing chipset mini drivers. */
103 agp_find_caps(device_t dev)
109 * Check the CAP_LIST bit of the PCI status register first.
111 status = pci_read_config(dev, PCIR_STATUS, 2);
112 if (!(status & 0x10))
116 * Traverse the capabilities list.
118 for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
121 u_int32_t capid = pci_read_config(dev, ptr, 4);
122 next = AGP_CAPID_GET_NEXT_PTR(capid);
125 * If this capability entry ID is 2, then we are done.
127 if (AGP_CAPID_GET_CAP_ID(capid) == 2)
135 * Find an AGP display device (if any).
138 agp_find_display(void)
140 devclass_t pci = devclass_find("pci");
141 device_t bus, dev = 0;
143 int busnum, numkids, i;
145 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
146 bus = devclass_get_device(pci, busnum);
149 device_get_children(bus, &kids, &numkids);
150 for (i = 0; i < numkids; i++) {
152 if (pci_get_class(dev) == PCIC_DISPLAY
153 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
154 if (agp_find_caps(dev)) {
167 agp_alloc_gatt(device_t dev)
169 u_int32_t apsize = AGP_GET_APERTURE(dev);
170 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
171 struct agp_gatt *gatt;
175 "allocating GATT for aperture of size %dM\n",
176 apsize / (1024*1024));
178 gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
182 gatt->ag_entries = entries;
183 gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
184 0, ~0, PAGE_SIZE, 0);
185 if (!gatt->ag_virtual) {
187 device_printf(dev, "contiguous allocation failed\n");
191 bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
192 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
199 agp_free_gatt(struct agp_gatt *gatt)
201 contigfree(gatt->ag_virtual,
202 gatt->ag_entries * sizeof(u_int32_t), M_AGP);
206 static int agp_max[][2] = {
217 #define agp_max_size (sizeof(agp_max) / sizeof(agp_max[0]))
220 agp_generic_attach(device_t dev)
222 struct agp_softc *sc = device_get_softc(dev);
226 * Find and map the aperture.
229 sc->as_aperture = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
230 0, ~0, 1, RF_ACTIVE);
231 if (!sc->as_aperture)
235 * Work out an upper bound for agp memory allocation. This
236 * uses a heurisitc table from the Linux driver.
238 memsize = ptoa(Maxmem) >> 20;
239 for (i = 0; i < agp_max_size; i++) {
240 if (memsize <= agp_max[i][0])
243 if (i == agp_max_size) i = agp_max_size - 1;
244 sc->as_maxmem = agp_max[i][1] << 20U;
247 * The lock is used to prevent re-entry to
248 * agp_generic_bind_memory() since that function can sleep.
250 lockinit(&sc->as_lock, PZERO|PCATCH, "agplk", 0, 0);
253 * Initialise stuff for the userland device.
255 agp_devclass = devclass_find("agp");
256 TAILQ_INIT(&sc->as_memory);
259 sc->as_devnode = make_dev(&agp_cdevsw,
260 device_get_unit(dev),
270 agp_generic_detach(device_t dev)
272 struct agp_softc *sc = device_get_softc(dev);
273 bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
274 lockmgr(&sc->as_lock, LK_DRAIN, 0, curthread);
275 lockdestroy(&sc->as_lock);
276 destroy_dev(sc->as_devnode);
282 agp_generic_enable(device_t dev, u_int32_t mode)
284 device_t mdev = agp_find_display();
285 u_int32_t tstatus, mstatus;
287 int rq, sba, fw, rate;;
290 AGP_DPF("can't find display\n");
294 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
295 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
297 /* Set RQ to the min of mode, tstatus and mstatus */
298 rq = AGP_MODE_GET_RQ(mode);
299 if (AGP_MODE_GET_RQ(tstatus) < rq)
300 rq = AGP_MODE_GET_RQ(tstatus);
301 if (AGP_MODE_GET_RQ(mstatus) < rq)
302 rq = AGP_MODE_GET_RQ(mstatus);
304 /* Set SBA if all three can deal with SBA */
305 sba = (AGP_MODE_GET_SBA(tstatus)
306 & AGP_MODE_GET_SBA(mstatus)
307 & AGP_MODE_GET_SBA(mode));
310 fw = (AGP_MODE_GET_FW(tstatus)
311 & AGP_MODE_GET_FW(mstatus)
312 & AGP_MODE_GET_FW(mode));
314 /* Figure out the max rate */
315 rate = (AGP_MODE_GET_RATE(tstatus)
316 & AGP_MODE_GET_RATE(mstatus)
317 & AGP_MODE_GET_RATE(mode));
318 if (rate & AGP_MODE_RATE_4x)
319 rate = AGP_MODE_RATE_4x;
320 else if (rate & AGP_MODE_RATE_2x)
321 rate = AGP_MODE_RATE_2x;
323 rate = AGP_MODE_RATE_1x;
325 /* Construct the new mode word and tell the hardware */
326 command = AGP_MODE_SET_RQ(0, rq);
327 command = AGP_MODE_SET_SBA(command, sba);
328 command = AGP_MODE_SET_FW(command, fw);
329 command = AGP_MODE_SET_RATE(command, rate);
330 command = AGP_MODE_SET_AGP(command, 1);
331 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
332 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
338 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
340 struct agp_softc *sc = device_get_softc(dev);
341 struct agp_memory *mem;
343 if ((size & (AGP_PAGE_SIZE - 1)) != 0)
346 if (sc->as_allocated + size > sc->as_maxmem)
350 printf("agp_generic_alloc_memory: unsupported type %d\n",
355 mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
356 mem->am_id = sc->as_nextid++;
359 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
360 mem->am_physical = 0;
362 mem->am_is_bound = 0;
363 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
364 sc->as_allocated += size;
370 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
372 struct agp_softc *sc = device_get_softc(dev);
374 if (mem->am_is_bound)
377 sc->as_allocated -= mem->am_size;
378 TAILQ_REMOVE(&sc->as_memory, mem, am_link);
379 vm_object_deallocate(mem->am_obj);
385 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
388 struct agp_softc *sc = device_get_softc(dev);
393 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
395 if (mem->am_is_bound) {
396 device_printf(dev, "memory already bound\n");
401 || (offset & (AGP_PAGE_SIZE - 1)) != 0
402 || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
403 device_printf(dev, "binding memory at bad offset %#x\n",
409 * Bind the individual pages and flush the chipset's
412 * XXX Presumably, this needs to be the pci address on alpha
413 * (i.e. use alpha_XXX_dmamap()). I don't have access to any
414 * alpha AGP hardware to check.
416 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
418 * Find a page from the object and wire it
419 * down. This page will be mapped using one or more
420 * entries in the GATT (assuming that PAGE_SIZE >=
421 * AGP_PAGE_SIZE. If this is the first call to bind,
422 * the pages will be allocated and zeroed.
424 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
425 VM_ALLOC_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
426 if ((m->flags & PG_ZERO) == 0)
428 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
431 * Install entries in the GATT, making sure that if
432 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
433 * aligned to PAGE_SIZE, we don't modify too many GATT
436 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
437 j += AGP_PAGE_SIZE) {
438 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
439 AGP_DPF("binding offset %#x to pa %#x\n",
441 error = AGP_BIND_PAGE(dev, offset + i + j, pa);
444 * Bail out. Reverse all the mappings
445 * and unwire the pages.
448 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
449 AGP_UNBIND_PAGE(dev, offset + k);
450 for (k = 0; k <= i; k += PAGE_SIZE) {
451 m = vm_page_lookup(mem->am_obj,
453 vm_page_lock_queues();
454 vm_page_unwire(m, 0);
455 vm_page_unlock_queues();
457 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
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);
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);
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_lock_queues();
507 vm_page_unwire(m, 0);
508 vm_page_unlock_queues();
515 mem->am_is_bound = 0;
517 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
522 /* Helper functions for implementing user/kernel api */
525 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
527 struct agp_softc *sc = device_get_softc(dev);
529 if (sc->as_state != AGP_ACQUIRE_FREE)
531 sc->as_state = state;
537 agp_release_helper(device_t dev, enum agp_acquire_state state)
539 struct agp_softc *sc = device_get_softc(dev);
541 if (sc->as_state == AGP_ACQUIRE_FREE)
544 if (sc->as_state != state)
547 sc->as_state = AGP_ACQUIRE_FREE;
551 static struct agp_memory *
552 agp_find_memory(device_t dev, int id)
554 struct agp_softc *sc = device_get_softc(dev);
555 struct agp_memory *mem;
557 AGP_DPF("searching for memory block %d\n", id);
558 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
559 AGP_DPF("considering memory block %d\n", mem->am_id);
560 if (mem->am_id == id)
566 /* Implementation of the userland ioctl api */
569 agp_info_user(device_t dev, agp_info *info)
571 struct agp_softc *sc = device_get_softc(dev);
573 bzero(info, sizeof *info);
574 info->bridge_id = pci_get_devid(dev);
576 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
577 info->aper_base = rman_get_start(sc->as_aperture);
578 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
579 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
580 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
586 agp_setup_user(device_t dev, agp_setup *setup)
588 return AGP_ENABLE(dev, setup->agp_mode);
592 agp_allocate_user(device_t dev, agp_allocate *alloc)
594 struct agp_memory *mem;
596 mem = AGP_ALLOC_MEMORY(dev,
598 alloc->pg_count << AGP_PAGE_SHIFT);
600 alloc->key = mem->am_id;
601 alloc->physical = mem->am_physical;
609 agp_deallocate_user(device_t dev, int id)
611 struct agp_memory *mem = agp_find_memory(dev, id);;
614 AGP_FREE_MEMORY(dev, mem);
622 agp_bind_user(device_t dev, agp_bind *bind)
624 struct agp_memory *mem = agp_find_memory(dev, bind->key);
629 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
633 agp_unbind_user(device_t dev, agp_unbind *unbind)
635 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
640 return AGP_UNBIND_MEMORY(dev, mem);
644 agp_open(dev_t kdev, int oflags, int devtype, struct thread *td)
646 device_t dev = KDEV2DEV(kdev);
647 struct agp_softc *sc = device_get_softc(dev);
649 if (!sc->as_isopen) {
658 agp_close(dev_t kdev, int fflag, int devtype, struct thread *td)
660 device_t dev = KDEV2DEV(kdev);
661 struct agp_softc *sc = device_get_softc(dev);
662 struct agp_memory *mem;
665 * Clear the GATT and force release on last close
667 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
668 if (mem->am_is_bound)
669 AGP_UNBIND_MEMORY(dev, mem);
670 AGP_FREE_MEMORY(dev, mem);
672 if (sc->as_state == AGP_ACQUIRE_USER)
673 agp_release_helper(dev, AGP_ACQUIRE_USER);
681 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
683 device_t dev = KDEV2DEV(kdev);
687 return agp_info_user(dev, (agp_info *) data);
690 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
693 return agp_release_helper(dev, AGP_ACQUIRE_USER);
696 return agp_setup_user(dev, (agp_setup *)data);
698 case AGPIOC_ALLOCATE:
699 return agp_allocate_user(dev, (agp_allocate *)data);
701 case AGPIOC_DEALLOCATE:
702 return agp_deallocate_user(dev, *(int *) data);
705 return agp_bind_user(dev, (agp_bind *)data);
708 return agp_unbind_user(dev, (agp_unbind *)data);
716 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
718 device_t dev = KDEV2DEV(kdev);
719 struct agp_softc *sc = device_get_softc(dev);
721 if (offset > AGP_GET_APERTURE(dev))
723 return atop(rman_get_start(sc->as_aperture) + offset);
726 /* Implementation of the kernel api */
733 return devclass_get_device(agp_devclass, 0);
736 enum agp_acquire_state
737 agp_state(device_t dev)
739 struct agp_softc *sc = device_get_softc(dev);
744 agp_get_info(device_t dev, struct agp_info *info)
746 struct agp_softc *sc = device_get_softc(dev);
749 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
750 info->ai_aperture_base = rman_get_start(sc->as_aperture);
751 info->ai_aperture_size = rman_get_size(sc->as_aperture);
752 info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
753 info->ai_memory_allowed = sc->as_maxmem;
754 info->ai_memory_used = sc->as_allocated;
758 agp_acquire(device_t dev)
760 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
764 agp_release(device_t dev)
766 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
770 agp_enable(device_t dev, u_int32_t mode)
772 return AGP_ENABLE(dev, mode);
775 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
777 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
780 void agp_free_memory(device_t dev, void *handle)
782 struct agp_memory *mem = (struct agp_memory *) handle;
783 AGP_FREE_MEMORY(dev, mem);
786 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
788 struct agp_memory *mem = (struct agp_memory *) handle;
789 return AGP_BIND_MEMORY(dev, mem, offset);
792 int agp_unbind_memory(device_t dev, void *handle)
794 struct agp_memory *mem = (struct agp_memory *) handle;
795 return AGP_UNBIND_MEMORY(dev, mem);
798 void agp_memory_info(device_t dev, void *handle, struct
801 struct agp_memory *mem = (struct agp_memory *) handle;
803 mi->ami_size = mem->am_size;
804 mi->ami_physical = mem->am_physical;
805 mi->ami_offset = mem->am_offset;
806 mi->ami_is_bound = mem->am_is_bound;