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
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/kernel.h>
37 #include <sys/ioccom.h>
38 #include <sys/agpio.h>
40 #include <sys/lockmgr.h>
41 #include <sys/mutex.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,
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, curthread);
274 lockdestroy(&sc->as_lock);
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, curthread);
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_WIRED | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
425 if ((m->flags & PG_ZERO) == 0)
427 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_lock_queues();
453 vm_page_unwire(m, 0);
454 vm_page_unlock_queues();
456 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
464 * Flush the cpu cache since we are providing a new mapping
470 * Make sure the chipset gets the new mappings.
474 mem->am_offset = offset;
475 mem->am_is_bound = 1;
477 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
483 agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
485 struct agp_softc *sc = device_get_softc(dev);
489 lockmgr(&sc->as_lock, LK_EXCLUSIVE, 0, curthread);
491 if (!mem->am_is_bound) {
492 device_printf(dev, "memory is not bound\n");
498 * Unbind the individual pages and flush the chipset's
499 * TLB. Unwire the pages so they can be swapped.
501 for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
502 AGP_UNBIND_PAGE(dev, mem->am_offset + i);
503 for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
504 m = vm_page_lookup(mem->am_obj, atop(i));
505 vm_page_lock_queues();
506 vm_page_unwire(m, 0);
507 vm_page_unlock_queues();
514 mem->am_is_bound = 0;
516 lockmgr(&sc->as_lock, LK_RELEASE, 0, curthread);
521 /* Helper functions for implementing user/kernel api */
524 agp_acquire_helper(device_t dev, enum agp_acquire_state state)
526 struct agp_softc *sc = device_get_softc(dev);
528 if (sc->as_state != AGP_ACQUIRE_FREE)
530 sc->as_state = state;
536 agp_release_helper(device_t dev, enum agp_acquire_state state)
538 struct agp_softc *sc = device_get_softc(dev);
540 if (sc->as_state == AGP_ACQUIRE_FREE)
543 if (sc->as_state != state)
546 sc->as_state = AGP_ACQUIRE_FREE;
550 static struct agp_memory *
551 agp_find_memory(device_t dev, int id)
553 struct agp_softc *sc = device_get_softc(dev);
554 struct agp_memory *mem;
556 AGP_DPF("searching for memory block %d\n", id);
557 TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
558 AGP_DPF("considering memory block %d\n", mem->am_id);
559 if (mem->am_id == id)
565 /* Implementation of the userland ioctl api */
568 agp_info_user(device_t dev, agp_info *info)
570 struct agp_softc *sc = device_get_softc(dev);
572 bzero(info, sizeof *info);
573 info->bridge_id = pci_get_devid(dev);
575 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
576 info->aper_base = rman_get_start(sc->as_aperture);
577 info->aper_size = AGP_GET_APERTURE(dev) >> 20;
578 info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
579 info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
585 agp_setup_user(device_t dev, agp_setup *setup)
587 return AGP_ENABLE(dev, setup->agp_mode);
591 agp_allocate_user(device_t dev, agp_allocate *alloc)
593 struct agp_memory *mem;
595 mem = AGP_ALLOC_MEMORY(dev,
597 alloc->pg_count << AGP_PAGE_SHIFT);
599 alloc->key = mem->am_id;
600 alloc->physical = mem->am_physical;
608 agp_deallocate_user(device_t dev, int id)
610 struct agp_memory *mem = agp_find_memory(dev, id);;
613 AGP_FREE_MEMORY(dev, mem);
621 agp_bind_user(device_t dev, agp_bind *bind)
623 struct agp_memory *mem = agp_find_memory(dev, bind->key);
628 return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
632 agp_unbind_user(device_t dev, agp_unbind *unbind)
634 struct agp_memory *mem = agp_find_memory(dev, unbind->key);
639 return AGP_UNBIND_MEMORY(dev, mem);
643 agp_open(dev_t kdev, int oflags, int devtype, struct thread *td)
645 device_t dev = KDEV2DEV(kdev);
646 struct agp_softc *sc = device_get_softc(dev);
648 if (!sc->as_isopen) {
657 agp_close(dev_t kdev, int fflag, int devtype, struct thread *td)
659 device_t dev = KDEV2DEV(kdev);
660 struct agp_softc *sc = device_get_softc(dev);
661 struct agp_memory *mem;
664 * Clear the GATT and force release on last close
666 while ((mem = TAILQ_FIRST(&sc->as_memory)) != 0) {
667 if (mem->am_is_bound)
668 AGP_UNBIND_MEMORY(dev, mem);
669 AGP_FREE_MEMORY(dev, mem);
671 if (sc->as_state == AGP_ACQUIRE_USER)
672 agp_release_helper(dev, AGP_ACQUIRE_USER);
680 agp_ioctl(dev_t kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
682 device_t dev = KDEV2DEV(kdev);
686 return agp_info_user(dev, (agp_info *) data);
689 return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
692 return agp_release_helper(dev, AGP_ACQUIRE_USER);
695 return agp_setup_user(dev, (agp_setup *)data);
697 case AGPIOC_ALLOCATE:
698 return agp_allocate_user(dev, (agp_allocate *)data);
700 case AGPIOC_DEALLOCATE:
701 return agp_deallocate_user(dev, *(int *) data);
704 return agp_bind_user(dev, (agp_bind *)data);
707 return agp_unbind_user(dev, (agp_unbind *)data);
715 agp_mmap(dev_t kdev, vm_offset_t offset, int prot)
717 device_t dev = KDEV2DEV(kdev);
718 struct agp_softc *sc = device_get_softc(dev);
720 if (offset > AGP_GET_APERTURE(dev))
722 return atop(rman_get_start(sc->as_aperture) + offset);
725 /* Implementation of the kernel api */
732 return devclass_get_device(agp_devclass, 0);
735 enum agp_acquire_state
736 agp_state(device_t dev)
738 struct agp_softc *sc = device_get_softc(dev);
743 agp_get_info(device_t dev, struct agp_info *info)
745 struct agp_softc *sc = device_get_softc(dev);
748 pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
749 info->ai_aperture_base = rman_get_start(sc->as_aperture);
750 info->ai_aperture_size = rman_get_size(sc->as_aperture);
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;