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 $
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>
43 #include <pci/pcivar.h>
44 #include <pci/pcireg.h>
45 #include <pci/agppriv.h>
46 #include <pci/agpvar.h>
47 #include <pci/agpreg.h>
50 #include <vm/vm_object.h>
51 #include <vm/vm_page.h>
52 #include <vm/vm_pageout.h>
55 #include <machine/md_var.h>
56 #include <machine/bus.h>
57 #include <machine/resource.h>
60 MODULE_VERSION(agp, 1);
62 MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
64 #define CDEV_MAJOR 148
66 static d_open_t agp_open;
67 static d_close_t agp_close;
68 static d_ioctl_t agp_ioctl;
69 static d_mmap_t agp_mmap;
71 static struct cdevsw agp_cdevsw = {
73 /* close */ agp_close,
76 /* ioctl */ agp_ioctl,
79 /* strategy */ nostrategy,
88 static devclass_t agp_devclass;
89 #define KDEV2DEV(kdev) devclass_get_device(agp_devclass, minor(kdev))
91 /* Helper functions for implementing chipset mini drivers. */
102 agp_find_caps(device_t dev)
108 * Check the CAP_LIST bit of the PCI status register first.
110 status = pci_read_config(dev, PCIR_STATUS, 2);
111 if (!(status & 0x10))
115 * Traverse the capabilities list.
117 for (ptr = pci_read_config(dev, AGP_CAPPTR, 1);
120 u_int32_t capid = pci_read_config(dev, ptr, 4);
121 next = AGP_CAPID_GET_NEXT_PTR(capid);
124 * If this capability entry ID is 2, then we are done.
126 if (AGP_CAPID_GET_CAP_ID(capid) == 2)
134 * Find an AGP display device (if any).
137 agp_find_display(void)
139 devclass_t pci = devclass_find("pci");
140 device_t bus, dev = 0;
142 int busnum, numkids, i;
144 for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
145 bus = devclass_get_device(pci, busnum);
148 device_get_children(bus, &kids, &numkids);
149 for (i = 0; i < numkids; i++) {
151 if (pci_get_class(dev) == PCIC_DISPLAY
152 && pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
153 if (agp_find_caps(dev)) {
166 agp_alloc_gatt(device_t dev)
168 u_int32_t apsize = AGP_GET_APERTURE(dev);
169 u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
170 struct agp_gatt *gatt;
174 "allocating GATT for aperture of size %dM\n",
175 apsize / (1024*1024));
177 gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
181 gatt->ag_entries = entries;
182 gatt->ag_virtual = contigmalloc(entries * sizeof(u_int32_t), M_AGP, 0,
183 0, ~0, PAGE_SIZE, 0);
184 if (!gatt->ag_virtual) {
186 device_printf(dev, "contiguous allocation failed\n");
190 bzero(gatt->ag_virtual, entries * sizeof(u_int32_t));
191 gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
198 agp_free_gatt(struct agp_gatt *gatt)
200 contigfree(gatt->ag_virtual,
201 gatt->ag_entries * sizeof(u_int32_t), M_AGP);
205 static int agp_max[][2] = {
216 #define agp_max_size (sizeof(agp_max) / sizeof(agp_max[0]))
219 agp_generic_attach(device_t dev)
221 struct agp_softc *sc = device_get_softc(dev);
225 * Find and map the aperture.
228 sc->as_aperture = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid,
229 0, ~0, 1, RF_ACTIVE);
230 if (!sc->as_aperture)
234 * Work out an upper bound for agp memory allocation. This
235 * uses a heurisitc table from the Linux driver.
237 memsize = ptoa(Maxmem) >> 20;
238 for (i = 0; i < agp_max_size; i++) {
239 if (memsize <= agp_max[i][0])
242 if (i == agp_max_size) i = agp_max_size - 1;
243 sc->as_maxmem = agp_max[i][1] << 20U;
246 * The lock is used to prevent re-entry to
247 * agp_generic_bind_memory() since that function can sleep.
249 lockinit(&sc->as_lock, PZERO|PCATCH, "agplk", 0, 0);
252 * Initialise stuff for the userland device.
254 agp_devclass = devclass_find("agp");
255 TAILQ_INIT(&sc->as_memory);
258 sc->as_devnode = make_dev(&agp_cdevsw,
259 device_get_unit(dev),
269 agp_generic_detach(device_t dev)
271 struct agp_softc *sc = device_get_softc(dev);
272 bus_release_resource(dev, SYS_RES_MEMORY, AGP_APBASE, sc->as_aperture);
273 lockmgr(&sc->as_lock, LK_DRAIN, 0, curproc);
274 destroy_dev(sc->as_devnode);
280 agp_generic_enable(device_t dev, u_int32_t mode)
282 device_t mdev = agp_find_display();
283 u_int32_t tstatus, mstatus;
285 int rq, sba, fw, rate;;
288 AGP_DPF("can't find display\n");
292 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
293 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
295 /* Set RQ to the min of mode, tstatus and mstatus */
296 rq = AGP_MODE_GET_RQ(mode);
297 if (AGP_MODE_GET_RQ(tstatus) < rq)
298 rq = AGP_MODE_GET_RQ(tstatus);
299 if (AGP_MODE_GET_RQ(mstatus) < rq)
300 rq = AGP_MODE_GET_RQ(mstatus);
302 /* Set SBA if all three can deal with SBA */
303 sba = (AGP_MODE_GET_SBA(tstatus)
304 & AGP_MODE_GET_SBA(mstatus)
305 & AGP_MODE_GET_SBA(mode));
308 fw = (AGP_MODE_GET_FW(tstatus)
309 & AGP_MODE_GET_FW(mstatus)
310 & AGP_MODE_GET_FW(mode));
312 /* Figure out the max rate */
313 rate = (AGP_MODE_GET_RATE(tstatus)
314 & AGP_MODE_GET_RATE(mstatus)
315 & AGP_MODE_GET_RATE(mode));
316 if (rate & AGP_MODE_RATE_4x)
317 rate = AGP_MODE_RATE_4x;
318 else if (rate & AGP_MODE_RATE_2x)
319 rate = AGP_MODE_RATE_2x;
321 rate = AGP_MODE_RATE_1x;
323 /* Construct the new mode word and tell the hardware */
324 command = AGP_MODE_SET_RQ(0, rq);
325 command = AGP_MODE_SET_SBA(command, sba);
326 command = AGP_MODE_SET_FW(command, fw);
327 command = AGP_MODE_SET_RATE(command, rate);
328 command = AGP_MODE_SET_AGP(command, 1);
329 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
330 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
336 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
338 struct agp_softc *sc = device_get_softc(dev);
339 struct agp_memory *mem;
341 if ((size & (AGP_PAGE_SIZE - 1)) != 0)
344 if (sc->as_allocated + size > sc->as_maxmem)
348 printf("agp_generic_alloc_memory: unsupported type %d\n",
353 mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
354 mem->am_id = sc->as_nextid++;
357 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
358 mem->am_physical = 0;
360 mem->am_is_bound = 0;
361 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
362 sc->as_allocated += size;
368 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
370 struct agp_softc *sc = device_get_softc(dev);
372 if (mem->am_is_bound)
375 sc->as_allocated -= mem->am_size;
376 TAILQ_REMOVE(&sc->as_memory, mem, am_link);
377 vm_object_deallocate(mem->am_obj);
383 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
386 struct agp_softc *sc = device_get_softc(dev);
391 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curproc);
393 if (mem->am_is_bound) {
394 device_printf(dev, "memory already bound\n");
399 || (offset & (AGP_PAGE_SIZE - 1)) != 0
400 || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
401 device_printf(dev, "binding memory at bad offset %#x\n",
407 * Bind the individual pages and flush the chipset's
410 * XXX Presumably, this needs to be the pci address on alpha
411 * (i.e. use alpha_XXX_dmamap()). I don't have access to any
412 * alpha AGP hardware to check.
414 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
416 * Find a page from the object and wire it
417 * down. This page will be mapped using one or more
418 * entries in the GATT (assuming that PAGE_SIZE >=
419 * AGP_PAGE_SIZE. If this is the first call to bind,
420 * the pages will be allocated and zeroed.
422 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
423 VM_ALLOC_ZERO | VM_ALLOC_RETRY);
424 if ((m->flags & PG_ZERO) == 0)
425 vm_page_zero_fill(m);
426 AGP_DPF("found page pa=%#x\n", VM_PAGE_TO_PHYS(m));
430 * Install entries in the GATT, making sure that if
431 * AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
432 * aligned to PAGE_SIZE, we don't modify too many GATT
435 for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
436 j += AGP_PAGE_SIZE) {
437 vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
438 AGP_DPF("binding offset %#x to pa %#x\n",
440 error = AGP_BIND_PAGE(dev, offset + i + j, pa);
443 * Bail out. Reverse all the mappings
444 * and unwire the pages.
447 for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
448 AGP_UNBIND_PAGE(dev, offset + k);
449 for (k = 0; k <= i; k += PAGE_SIZE) {
450 m = vm_page_lookup(mem->am_obj,
452 vm_page_unwire(m, 0);
454 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
462 * Flush the cpu cache since we are providing a new mapping
468 * Make sure the chipset gets the new mappings.
472 mem->am_offset = offset;
473 mem->am_is_bound = 1;
475 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
481 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
483 struct agp_softc *sc = device_get_softc(dev);
487 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curproc);
489 if (!mem->am_is_bound) {
490 device_printf(dev, "memory is not bound\n");
496 * Unbind the individual pages and flush the chipset's
497 * TLB. Unwire the pages so they can be swapped.
499 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
500 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
501 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
502 m = vm_page_lookup(mem->am_obj, atop(i));
503 vm_page_unwire(m, 0);
510 mem->am_is_bound = 0;
512 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
517 /* Helper functions for implementing user/kernel api */
520 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
522 struct agp_softc *sc = device_get_softc(dev);
524 if (sc->as_state != AGP_ACQUIRE_FREE)
526 sc->as_state = state;
532 agp_release_helper(device_t dev, enum agp_acquire_state state)
534 struct agp_softc *sc = device_get_softc(dev);
536 if (sc->as_state == AGP_ACQUIRE_FREE)
539 if (sc->as_state != state)
542 sc->as_state = AGP_ACQUIRE_FREE;
546 static struct agp_memory *
547 agp_find_memory(device_t dev, int id)
549 struct agp_softc *sc = device_get_softc(dev);
550 struct agp_memory *mem;
552 AGP_DPF("searching for memory block %d\n", id);
553 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
554 AGP_DPF("considering memory block %d\n", mem->am_id);
555 if (mem->am_id == id)
561 /* Implementation of the userland ioctl api */
564 agp_info_user(device_t dev, agp_info *info)
566 struct agp_softc *sc = device_get_softc(dev);
568 bzero(info, sizeof *info);
569 info->bridge_id = pci_get_devid(dev);
571 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
572 info->aper_base = rman_get_start(sc->as_aperture);
573 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
574 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
575 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
581 agp_setup_user(device_t dev, agp_setup *setup)
583 return AGP_ENABLE(dev, setup->agp_mode);
587 agp_allocate_user(device_t dev, agp_allocate *alloc)
589 struct agp_memory *mem;
591 mem = AGP_ALLOC_MEMORY(dev,
593 alloc->pg_count << AGP_PAGE_SHIFT);
595 alloc->key = mem->am_id;
596 alloc->physical = mem->am_physical;
604 agp_deallocate_user(device_t dev, int id)
606 struct agp_memory *mem = agp_find_memory(dev, id);;
609 AGP_FREE_MEMORY(dev, mem);
617 agp_bind_user(device_t dev, agp_bind *bind)
619 struct agp_memory *mem = agp_find_memory(dev, bind->key);
624 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
628 agp_unbind_user(device_t dev, agp_unbind *unbind)
630 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
635 return AGP_UNBIND_MEMORY(dev, mem);
639 agp_open(dev_t kdev, int oflags, int devtype, struct proc *p)
641 device_t dev = KDEV2DEV(kdev);
642 struct agp_softc *sc = device_get_softc(dev);
644 if (!sc->as_isopen) {
653 agp_close(dev_t kdev, int fflag, int devtype, struct proc *p)
655 device_t dev = KDEV2DEV(kdev);
656 struct agp_softc *sc = device_get_softc(dev);
657 struct agp_memory *mem;
660 * Clear the GATT and force release on last close
662 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
663 if (mem->am_is_bound)
664 AGP_UNBIND_MEMORY(dev, mem);
665 AGP_FREE_MEMORY(dev, mem);
667 if (sc->as_state == AGP_ACQUIRE_USER)
668 agp_release_helper(dev, AGP_ACQUIRE_USER);
676 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct proc *p)
678 device_t dev = KDEV2DEV(kdev);
682 return agp_info_user(dev, (agp_info *) data);
685 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
688 return agp_release_helper(dev, AGP_ACQUIRE_USER);
691 return agp_setup_user(dev, (agp_setup *)data);
693 case AGPIOC_ALLOCATE:
694 return agp_allocate_user(dev, (agp_allocate *)data);
696 case AGPIOC_DEALLOCATE:
697 return agp_deallocate_user(dev, *(int *) data);
700 return agp_bind_user(dev, (agp_bind *)data);
703 return agp_unbind_user(dev, (agp_unbind *)data);
711 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
713 device_t dev = KDEV2DEV(kdev);
714 struct agp_softc *sc = device_get_softc(dev);
716 if (offset > AGP_GET_APERTURE(dev))
718 return atop(rman_get_start(sc->as_aperture) + offset);
721 /* Implementation of the kernel api */
728 return devclass_get_device(agp_devclass, 0);
731 enum agp_acquire_state
732 agp_state(device_t dev)
734 struct agp_softc *sc = device_get_softc(dev);
739 agp_get_info(device_t dev, struct agp_info *info)
741 struct agp_softc *sc = device_get_softc(dev);
744 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
745 info->ai_aperture_base = rman_get_start(sc->as_aperture);
746 info->ai_aperture_size = (rman_get_end(sc->as_aperture)
747 - rman_get_start(sc->as_aperture)) + 1;
748 info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
749 info->ai_memory_allowed = sc->as_maxmem;
750 info->ai_memory_used = sc->as_allocated;
754 agp_acquire(device_t dev)
756 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
760 agp_release(device_t dev)
762 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
766 agp_enable(device_t dev, u_int32_t mode)
768 return AGP_ENABLE(dev, mode);
771 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
773 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
776 void agp_free_memory(device_t dev, void *handle)
778 struct agp_memory *mem = (struct agp_memory *) handle;
779 AGP_FREE_MEMORY(dev, mem);
782 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
784 struct agp_memory *mem = (struct agp_memory *) handle;
785 return AGP_BIND_MEMORY(dev, mem, offset);
788 int agp_unbind_memory(device_t dev, void *handle)
790 struct agp_memory *mem = (struct agp_memory *) handle;
791 return AGP_UNBIND_MEMORY(dev, mem);
794 void agp_memory_info(device_t dev, void *handle, struct
797 struct agp_memory *mem = (struct agp_memory *) handle;
799 mi->ami_size = mem->am_size;
800 mi->ami_physical = mem->am_physical;
801 mi->ami_offset = mem->am_offset;
802 mi->ami_is_bound = mem->am_is_bound;