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 1.2 2003/06/17 04:28:56 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 <pci/pcivar.h>
45 #include <pci/pcireg.h>
46 #include <pci/agppriv.h>
47 #include <pci/agpvar.h>
48 #include <pci/agpreg.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 = {
74 /* close */ agp_close,
77 /* ioctl */ agp_ioctl,
80 /* 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, curproc);
275 destroy_dev(sc->as_devnode);
281 agp_generic_enable(device_t dev, u_int32_t mode)
283 device_t mdev = agp_find_display();
284 u_int32_t tstatus, mstatus;
286 int rq, sba, fw, rate;;
289 AGP_DPF("can't find display\n");
293 tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
294 mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
296 /* Set RQ to the min of mode, tstatus and mstatus */
297 rq = AGP_MODE_GET_RQ(mode);
298 if (AGP_MODE_GET_RQ(tstatus) < rq)
299 rq = AGP_MODE_GET_RQ(tstatus);
300 if (AGP_MODE_GET_RQ(mstatus) < rq)
301 rq = AGP_MODE_GET_RQ(mstatus);
303 /* Set SBA if all three can deal with SBA */
304 sba = (AGP_MODE_GET_SBA(tstatus)
305 & AGP_MODE_GET_SBA(mstatus)
306 & AGP_MODE_GET_SBA(mode));
309 fw = (AGP_MODE_GET_FW(tstatus)
310 & AGP_MODE_GET_FW(mstatus)
311 & AGP_MODE_GET_FW(mode));
313 /* Figure out the max rate */
314 rate = (AGP_MODE_GET_RATE(tstatus)
315 & AGP_MODE_GET_RATE(mstatus)
316 & AGP_MODE_GET_RATE(mode));
317 if (rate & AGP_MODE_RATE_4x)
318 rate = AGP_MODE_RATE_4x;
319 else if (rate & AGP_MODE_RATE_2x)
320 rate = AGP_MODE_RATE_2x;
322 rate = AGP_MODE_RATE_1x;
324 /* Construct the new mode word and tell the hardware */
325 command = AGP_MODE_SET_RQ(0, rq);
326 command = AGP_MODE_SET_SBA(command, sba);
327 command = AGP_MODE_SET_FW(command, fw);
328 command = AGP_MODE_SET_RATE(command, rate);
329 command = AGP_MODE_SET_AGP(command, 1);
330 pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
331 pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
337 agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
339 struct agp_softc *sc = device_get_softc(dev);
340 struct agp_memory *mem;
342 if ((size & (AGP_PAGE_SIZE - 1)) != 0)
345 if (sc->as_allocated + size > sc->as_maxmem)
349 printf("agp_generic_alloc_memory: unsupported type %d\n",
354 mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
355 mem->am_id = sc->as_nextid++;
358 mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
359 mem->am_physical = 0;
361 mem->am_is_bound = 0;
362 TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
363 sc->as_allocated += size;
369 agp_generic_free_memory(device_t dev, struct agp_memory *mem)
371 struct agp_softc *sc = device_get_softc(dev);
373 if (mem->am_is_bound)
376 sc->as_allocated -= mem->am_size;
377 TAILQ_REMOVE(&sc->as_memory, mem, am_link);
378 vm_object_deallocate(mem->am_obj);
384 agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
387 struct agp_softc *sc = device_get_softc(dev);
392 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curproc);
394 if (mem->am_is_bound) {
395 device_printf(dev, "memory already bound\n");
400 || (offset & (AGP_PAGE_SIZE - 1)) != 0
401 || offset + mem->am_size > AGP_GET_APERTURE(dev)) {
402 device_printf(dev, "binding memory at bad offset %#x\n",
408 * Bind the individual pages and flush the chipset's
411 * XXX Presumably, this needs to be the pci address on alpha
412 * (i.e. use alpha_XXX_dmamap()). I don't have access to any
413 * alpha AGP hardware to check.
415 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
417 * Find a page from the object and wire it
418 * down. This page will be mapped using one or more
419 * entries in the GATT (assuming that PAGE_SIZE >=
420 * AGP_PAGE_SIZE. If this is the first call to bind,
421 * the pages will be allocated and zeroed.
423 m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
424 VM_ALLOC_ZERO | VM_ALLOC_RETRY);
425 if ((m->flags & PG_ZERO) == 0)
426 vm_page_zero_fill(m);
427 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_unwire(m, 0);
455 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
463 * Flush the cpu cache since we are providing a new mapping
469 * Make sure the chipset gets the new mappings.
473 mem->am_offset = offset;
474 mem->am_is_bound = 1;
476 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
482 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
484 struct agp_softc *sc = device_get_softc(dev);
488 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curproc);
490 if (!mem->am_is_bound) {
491 device_printf(dev, "memory is not bound\n");
497 * Unbind the individual pages and flush the chipset's
498 * TLB. Unwire the pages so they can be swapped.
500 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
501 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
502 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
503 m = vm_page_lookup(mem->am_obj, atop(i));
504 vm_page_unwire(m, 0);
511 mem->am_is_bound = 0;
513 lockmgr(&sc->as_lock, LK_RELEASE, 0, curproc);
518 /* Helper functions for implementing user/kernel api */
521 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
523 struct agp_softc *sc = device_get_softc(dev);
525 if (sc->as_state != AGP_ACQUIRE_FREE)
527 sc->as_state = state;
533 agp_release_helper(device_t dev, enum agp_acquire_state state)
535 struct agp_softc *sc = device_get_softc(dev);
537 if (sc->as_state == AGP_ACQUIRE_FREE)
540 if (sc->as_state != state)
543 sc->as_state = AGP_ACQUIRE_FREE;
547 static struct agp_memory *
548 agp_find_memory(device_t dev, int id)
550 struct agp_softc *sc = device_get_softc(dev);
551 struct agp_memory *mem;
553 AGP_DPF("searching for memory block %d\n", id);
554 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
555 AGP_DPF("considering memory block %d\n", mem->am_id);
556 if (mem->am_id == id)
562 /* Implementation of the userland ioctl api */
565 agp_info_user(device_t dev, agp_info *info)
567 struct agp_softc *sc = device_get_softc(dev);
569 bzero(info, sizeof *info);
570 info->bridge_id = pci_get_devid(dev);
572 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
573 info->aper_base = rman_get_start(sc->as_aperture);
574 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
575 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
576 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
582 agp_setup_user(device_t dev, agp_setup *setup)
584 return AGP_ENABLE(dev, setup->agp_mode);
588 agp_allocate_user(device_t dev, agp_allocate *alloc)
590 struct agp_memory *mem;
592 mem = AGP_ALLOC_MEMORY(dev,
594 alloc->pg_count << AGP_PAGE_SHIFT);
596 alloc->key = mem->am_id;
597 alloc->physical = mem->am_physical;
605 agp_deallocate_user(device_t dev, int id)
607 struct agp_memory *mem = agp_find_memory(dev, id);;
610 AGP_FREE_MEMORY(dev, mem);
618 agp_bind_user(device_t dev, agp_bind *bind)
620 struct agp_memory *mem = agp_find_memory(dev, bind->key);
625 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
629 agp_unbind_user(device_t dev, agp_unbind *unbind)
631 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
636 return AGP_UNBIND_MEMORY(dev, mem);
640 agp_open(dev_t kdev, int oflags, int devtype, struct proc *p)
642 device_t dev = KDEV2DEV(kdev);
643 struct agp_softc *sc = device_get_softc(dev);
645 if (!sc->as_isopen) {
654 agp_close(dev_t kdev, int fflag, int devtype, struct proc *p)
656 device_t dev = KDEV2DEV(kdev);
657 struct agp_softc *sc = device_get_softc(dev);
658 struct agp_memory *mem;
661 * Clear the GATT and force release on last close
663 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
664 if (mem->am_is_bound)
665 AGP_UNBIND_MEMORY(dev, mem);
666 AGP_FREE_MEMORY(dev, mem);
668 if (sc->as_state == AGP_ACQUIRE_USER)
669 agp_release_helper(dev, AGP_ACQUIRE_USER);
677 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct proc *p)
679 device_t dev = KDEV2DEV(kdev);
683 return agp_info_user(dev, (agp_info *) data);
686 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
689 return agp_release_helper(dev, AGP_ACQUIRE_USER);
692 return agp_setup_user(dev, (agp_setup *)data);
694 case AGPIOC_ALLOCATE:
695 return agp_allocate_user(dev, (agp_allocate *)data);
697 case AGPIOC_DEALLOCATE:
698 return agp_deallocate_user(dev, *(int *) data);
701 return agp_bind_user(dev, (agp_bind *)data);
704 return agp_unbind_user(dev, (agp_unbind *)data);
712 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
714 device_t dev = KDEV2DEV(kdev);
715 struct agp_softc *sc = device_get_softc(dev);
717 if (offset > AGP_GET_APERTURE(dev))
719 return atop(rman_get_start(sc->as_aperture) + offset);
722 /* Implementation of the kernel api */
729 return devclass_get_device(agp_devclass, 0);
732 enum agp_acquire_state
733 agp_state(device_t dev)
735 struct agp_softc *sc = device_get_softc(dev);
740 agp_get_info(device_t dev, struct agp_info *info)
742 struct agp_softc *sc = device_get_softc(dev);
745 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
746 info->ai_aperture_base = rman_get_start(sc->as_aperture);
747 info->ai_aperture_size = (rman_get_end(sc->as_aperture)
748 - rman_get_start(sc->as_aperture)) + 1;
749 info->ai_aperture_va = (vm_offset_t) rman_get_virtual(sc->as_aperture);
750 info->ai_memory_allowed = sc->as_maxmem;
751 info->ai_memory_used = sc->as_allocated;
755 agp_acquire(device_t dev)
757 return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
761 agp_release(device_t dev)
763 return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
767 agp_enable(device_t dev, u_int32_t mode)
769 return AGP_ENABLE(dev, mode);
772 void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
774 return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
777 void agp_free_memory(device_t dev, void *handle)
779 struct agp_memory *mem = (struct agp_memory *) handle;
780 AGP_FREE_MEMORY(dev, mem);
783 int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
785 struct agp_memory *mem = (struct agp_memory *) handle;
786 return AGP_BIND_MEMORY(dev, mem, offset);
789 int agp_unbind_memory(device_t dev, void *handle)
791 struct agp_memory *mem = (struct agp_memory *) handle;
792 return AGP_UNBIND_MEMORY(dev, mem);
795 void agp_memory_info(device_t dev, void *handle, struct
798 struct agp_memory *mem = (struct agp_memory *) handle;
800 mi->ami_size = mem->am_size;
801 mi->ami_physical = mem->am_physical;
802 mi->ami_offset = mem->am_offset;
803 mi->ami_is_bound = mem->am_is_bound;