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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/char/agp/generic.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/char/agp/generic.c')
-rw-r--r--drivers/char/agp/generic.c1222
1 files changed, 1222 insertions, 0 deletions
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
new file mode 100644
index 000000000000..c321a924e38a
--- /dev/null
+++ b/drivers/char/agp/generic.c
@@ -0,0 +1,1222 @@
1/*
2 * AGPGART driver.
3 * Copyright (C) 2004 Silicon Graphics, Inc.
4 * Copyright (C) 2002-2005 Dave Jones.
5 * Copyright (C) 1999 Jeff Hartmann.
6 * Copyright (C) 1999 Precision Insight, Inc.
7 * Copyright (C) 1999 Xi Graphics, Inc.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * JEFF HARTMANN, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
23 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
24 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
25 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 * TODO:
28 * - Allocate more than order 0 pages to avoid too much linear map splitting.
29 */
30#include <linux/config.h>
31#include <linux/module.h>
32#include <linux/pci.h>
33#include <linux/init.h>
34#include <linux/pagemap.h>
35#include <linux/miscdevice.h>
36#include <linux/pm.h>
37#include <linux/agp_backend.h>
38#include <linux/vmalloc.h>
39#include <linux/dma-mapping.h>
40#include <linux/mm.h>
41#include <asm/io.h>
42#include <asm/cacheflush.h>
43#include <asm/pgtable.h>
44#include "agp.h"
45
46__u32 *agp_gatt_table;
47int agp_memory_reserved;
48
49/*
50 * Needed by the Nforce GART driver for the time being. Would be
51 * nice to do this some other way instead of needing this export.
52 */
53EXPORT_SYMBOL_GPL(agp_memory_reserved);
54
55#if defined(CONFIG_X86)
56int map_page_into_agp(struct page *page)
57{
58 int i;
59 i = change_page_attr(page, 1, PAGE_KERNEL_NOCACHE);
60 global_flush_tlb();
61 return i;
62}
63EXPORT_SYMBOL_GPL(map_page_into_agp);
64
65int unmap_page_from_agp(struct page *page)
66{
67 int i;
68 i = change_page_attr(page, 1, PAGE_KERNEL);
69 global_flush_tlb();
70 return i;
71}
72EXPORT_SYMBOL_GPL(unmap_page_from_agp);
73#endif
74
75/*
76 * Generic routines for handling agp_memory structures -
77 * They use the basic page allocation routines to do the brunt of the work.
78 */
79
80void agp_free_key(int key)
81{
82 if (key < 0)
83 return;
84
85 if (key < MAXKEY)
86 clear_bit(key, agp_bridge->key_list);
87}
88EXPORT_SYMBOL(agp_free_key);
89
90
91static int agp_get_key(void)
92{
93 int bit;
94
95 bit = find_first_zero_bit(agp_bridge->key_list, MAXKEY);
96 if (bit < MAXKEY) {
97 set_bit(bit, agp_bridge->key_list);
98 return bit;
99 }
100 return -1;
101}
102
103
104struct agp_memory *agp_create_memory(int scratch_pages)
105{
106 struct agp_memory *new;
107
108 new = kmalloc(sizeof(struct agp_memory), GFP_KERNEL);
109
110 if (new == NULL)
111 return NULL;
112
113 memset(new, 0, sizeof(struct agp_memory));
114 new->key = agp_get_key();
115
116 if (new->key < 0) {
117 kfree(new);
118 return NULL;
119 }
120 new->memory = vmalloc(PAGE_SIZE * scratch_pages);
121
122 if (new->memory == NULL) {
123 agp_free_key(new->key);
124 kfree(new);
125 return NULL;
126 }
127 new->num_scratch_pages = scratch_pages;
128 return new;
129}
130EXPORT_SYMBOL(agp_create_memory);
131
132/**
133 * agp_free_memory - free memory associated with an agp_memory pointer.
134 *
135 * @curr: agp_memory pointer to be freed.
136 *
137 * It is the only function that can be called when the backend is not owned
138 * by the caller. (So it can free memory on client death.)
139 */
140void agp_free_memory(struct agp_memory *curr)
141{
142 size_t i;
143
144 if (curr == NULL)
145 return;
146
147 if (curr->is_bound == TRUE)
148 agp_unbind_memory(curr);
149
150 if (curr->type != 0) {
151 curr->bridge->driver->free_by_type(curr);
152 return;
153 }
154 if (curr->page_count != 0) {
155 for (i = 0; i < curr->page_count; i++) {
156 curr->bridge->driver->agp_destroy_page(phys_to_virt(curr->memory[i]));
157 }
158 }
159 agp_free_key(curr->key);
160 vfree(curr->memory);
161 kfree(curr);
162}
163EXPORT_SYMBOL(agp_free_memory);
164
165#define ENTRIES_PER_PAGE (PAGE_SIZE / sizeof(unsigned long))
166
167/**
168 * agp_allocate_memory - allocate a group of pages of a certain type.
169 *
170 * @page_count: size_t argument of the number of pages
171 * @type: u32 argument of the type of memory to be allocated.
172 *
173 * Every agp bridge device will allow you to allocate AGP_NORMAL_MEMORY which
174 * maps to physical ram. Any other type is device dependent.
175 *
176 * It returns NULL whenever memory is unavailable.
177 */
178struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
179 size_t page_count, u32 type)
180{
181 int scratch_pages;
182 struct agp_memory *new;
183 size_t i;
184
185 if (!bridge)
186 return NULL;
187
188 if ((atomic_read(&bridge->current_memory_agp) + page_count) > bridge->max_memory_agp)
189 return NULL;
190
191 if (type != 0) {
192 new = bridge->driver->alloc_by_type(page_count, type);
193 if (new)
194 new->bridge = bridge;
195 return new;
196 }
197
198 scratch_pages = (page_count + ENTRIES_PER_PAGE - 1) / ENTRIES_PER_PAGE;
199
200 new = agp_create_memory(scratch_pages);
201
202 if (new == NULL)
203 return NULL;
204
205 for (i = 0; i < page_count; i++) {
206 void *addr = bridge->driver->agp_alloc_page(bridge);
207
208 if (addr == NULL) {
209 agp_free_memory(new);
210 return NULL;
211 }
212 new->memory[i] = virt_to_phys(addr);
213 new->page_count++;
214 }
215 new->bridge = bridge;
216
217 flush_agp_mappings();
218
219 return new;
220}
221EXPORT_SYMBOL(agp_allocate_memory);
222
223
224/* End - Generic routines for handling agp_memory structures */
225
226
227static int agp_return_size(void)
228{
229 int current_size;
230 void *temp;
231
232 temp = agp_bridge->current_size;
233
234 switch (agp_bridge->driver->size_type) {
235 case U8_APER_SIZE:
236 current_size = A_SIZE_8(temp)->size;
237 break;
238 case U16_APER_SIZE:
239 current_size = A_SIZE_16(temp)->size;
240 break;
241 case U32_APER_SIZE:
242 current_size = A_SIZE_32(temp)->size;
243 break;
244 case LVL2_APER_SIZE:
245 current_size = A_SIZE_LVL2(temp)->size;
246 break;
247 case FIXED_APER_SIZE:
248 current_size = A_SIZE_FIX(temp)->size;
249 break;
250 default:
251 current_size = 0;
252 break;
253 }
254
255 current_size -= (agp_memory_reserved / (1024*1024));
256 if (current_size <0)
257 current_size = 0;
258 return current_size;
259}
260
261
262int agp_num_entries(void)
263{
264 int num_entries;
265 void *temp;
266
267 temp = agp_bridge->current_size;
268
269 switch (agp_bridge->driver->size_type) {
270 case U8_APER_SIZE:
271 num_entries = A_SIZE_8(temp)->num_entries;
272 break;
273 case U16_APER_SIZE:
274 num_entries = A_SIZE_16(temp)->num_entries;
275 break;
276 case U32_APER_SIZE:
277 num_entries = A_SIZE_32(temp)->num_entries;
278 break;
279 case LVL2_APER_SIZE:
280 num_entries = A_SIZE_LVL2(temp)->num_entries;
281 break;
282 case FIXED_APER_SIZE:
283 num_entries = A_SIZE_FIX(temp)->num_entries;
284 break;
285 default:
286 num_entries = 0;
287 break;
288 }
289
290 num_entries -= agp_memory_reserved>>PAGE_SHIFT;
291 if (num_entries<0)
292 num_entries = 0;
293 return num_entries;
294}
295EXPORT_SYMBOL_GPL(agp_num_entries);
296
297
298static int check_bridge_mode(struct pci_dev *dev)
299{
300 u32 agp3;
301 u8 cap_ptr;
302
303 cap_ptr = pci_find_capability(dev, PCI_CAP_ID_AGP);
304 pci_read_config_dword(dev, cap_ptr+AGPSTAT, &agp3);
305 if (agp3 & AGPSTAT_MODE_3_0)
306 return 1;
307 return 0;
308}
309
310
311/**
312 * agp_copy_info - copy bridge state information
313 *
314 * @info: agp_kern_info pointer. The caller should insure that this pointer is valid.
315 *
316 * This function copies information about the agp bridge device and the state of
317 * the agp backend into an agp_kern_info pointer.
318 */
319int agp_copy_info(struct agp_bridge_data *bridge, struct agp_kern_info *info)
320{
321 memset(info, 0, sizeof(struct agp_kern_info));
322 if (!bridge) {
323 info->chipset = NOT_SUPPORTED;
324 return -EIO;
325 }
326
327 info->version.major = bridge->version->major;
328 info->version.minor = bridge->version->minor;
329 info->chipset = SUPPORTED;
330 info->device = bridge->dev;
331 if (check_bridge_mode(bridge->dev))
332 info->mode = bridge->mode & ~AGP3_RESERVED_MASK;
333 else
334 info->mode = bridge->mode & ~AGP2_RESERVED_MASK;
335 info->mode = bridge->mode;
336 info->aper_base = bridge->gart_bus_addr;
337 info->aper_size = agp_return_size();
338 info->max_memory = bridge->max_memory_agp;
339 info->current_memory = atomic_read(&bridge->current_memory_agp);
340 info->cant_use_aperture = bridge->driver->cant_use_aperture;
341 info->vm_ops = bridge->vm_ops;
342 info->page_mask = ~0UL;
343 return 0;
344}
345EXPORT_SYMBOL(agp_copy_info);
346
347/* End - Routine to copy over information structure */
348
349/*
350 * Routines for handling swapping of agp_memory into the GATT -
351 * These routines take agp_memory and insert them into the GATT.
352 * They call device specific routines to actually write to the GATT.
353 */
354
355/**
356 * agp_bind_memory - Bind an agp_memory structure into the GATT.
357 *
358 * @curr: agp_memory pointer
359 * @pg_start: an offset into the graphics aperture translation table
360 *
361 * It returns -EINVAL if the pointer == NULL.
362 * It returns -EBUSY if the area of the table requested is already in use.
363 */
364int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
365{
366 int ret_val;
367
368 if (curr == NULL)
369 return -EINVAL;
370
371 if (curr->is_bound == TRUE) {
372 printk (KERN_INFO PFX "memory %p is already bound!\n", curr);
373 return -EINVAL;
374 }
375 if (curr->is_flushed == FALSE) {
376 curr->bridge->driver->cache_flush();
377 curr->is_flushed = TRUE;
378 }
379 ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
380
381 if (ret_val != 0)
382 return ret_val;
383
384 curr->is_bound = TRUE;
385 curr->pg_start = pg_start;
386 return 0;
387}
388EXPORT_SYMBOL(agp_bind_memory);
389
390
391/**
392 * agp_unbind_memory - Removes an agp_memory structure from the GATT
393 *
394 * @curr: agp_memory pointer to be removed from the GATT.
395 *
396 * It returns -EINVAL if this piece of agp_memory is not currently bound to
397 * the graphics aperture translation table or if the agp_memory pointer == NULL
398 */
399int agp_unbind_memory(struct agp_memory *curr)
400{
401 int ret_val;
402
403 if (curr == NULL)
404 return -EINVAL;
405
406 if (curr->is_bound != TRUE) {
407 printk (KERN_INFO PFX "memory %p was not bound!\n", curr);
408 return -EINVAL;
409 }
410
411 ret_val = curr->bridge->driver->remove_memory(curr, curr->pg_start, curr->type);
412
413 if (ret_val != 0)
414 return ret_val;
415
416 curr->is_bound = FALSE;
417 curr->pg_start = 0;
418 return 0;
419}
420EXPORT_SYMBOL(agp_unbind_memory);
421
422/* End - Routines for handling swapping of agp_memory into the GATT */
423
424
425/* Generic Agp routines - Start */
426static void agp_v2_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
427{
428 u32 tmp;
429
430 if (*requested_mode & AGP2_RESERVED_MASK) {
431 printk (KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
432 *requested_mode &= ~AGP2_RESERVED_MASK;
433 }
434
435 /* Check the speed bits make sense. Only one should be set. */
436 tmp = *requested_mode & 7;
437 switch (tmp) {
438 case 0:
439 printk (KERN_INFO PFX "%s tried to set rate=x0. Setting to x1 mode.\n", current->comm);
440 *requested_mode |= AGPSTAT2_1X;
441 break;
442 case 1:
443 case 2:
444 break;
445 case 3:
446 *requested_mode &= ~(AGPSTAT2_1X); /* rate=2 */
447 break;
448 case 4:
449 break;
450 case 5:
451 case 6:
452 case 7:
453 *requested_mode &= ~(AGPSTAT2_1X|AGPSTAT2_2X); /* rate=4*/
454 break;
455 }
456
457 /* disable SBA if it's not supported */
458 if (!((*bridge_agpstat & AGPSTAT_SBA) && (*vga_agpstat & AGPSTAT_SBA) && (*requested_mode & AGPSTAT_SBA)))
459 *bridge_agpstat &= ~AGPSTAT_SBA;
460
461 /* Set rate */
462 if (!((*bridge_agpstat & AGPSTAT2_4X) && (*vga_agpstat & AGPSTAT2_4X) && (*requested_mode & AGPSTAT2_4X)))
463 *bridge_agpstat &= ~AGPSTAT2_4X;
464
465 if (!((*bridge_agpstat & AGPSTAT2_2X) && (*vga_agpstat & AGPSTAT2_2X) && (*requested_mode & AGPSTAT2_2X)))
466 *bridge_agpstat &= ~AGPSTAT2_2X;
467
468 if (!((*bridge_agpstat & AGPSTAT2_1X) && (*vga_agpstat & AGPSTAT2_1X) && (*requested_mode & AGPSTAT2_1X)))
469 *bridge_agpstat &= ~AGPSTAT2_1X;
470
471 /* Now we know what mode it should be, clear out the unwanted bits. */
472 if (*bridge_agpstat & AGPSTAT2_4X)
473 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_2X); /* 4X */
474
475 if (*bridge_agpstat & AGPSTAT2_2X)
476 *bridge_agpstat &= ~(AGPSTAT2_1X | AGPSTAT2_4X); /* 2X */
477
478 if (*bridge_agpstat & AGPSTAT2_1X)
479 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X); /* 1X */
480
481 /* Apply any errata. */
482 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
483 *bridge_agpstat &= ~AGPSTAT_FW;
484
485 if (agp_bridge->flags & AGP_ERRATA_SBA)
486 *bridge_agpstat &= ~AGPSTAT_SBA;
487
488 if (agp_bridge->flags & AGP_ERRATA_1X) {
489 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
490 *bridge_agpstat |= AGPSTAT2_1X;
491 }
492
493 /* If we've dropped down to 1X, disable fast writes. */
494 if (*bridge_agpstat & AGPSTAT2_1X)
495 *bridge_agpstat &= ~AGPSTAT_FW;
496}
497
498/*
499 * requested_mode = Mode requested by (typically) X.
500 * bridge_agpstat = PCI_AGP_STATUS from agp bridge.
501 * vga_agpstat = PCI_AGP_STATUS from graphic card.
502 */
503static void agp_v3_parse_one(u32 *requested_mode, u32 *bridge_agpstat, u32 *vga_agpstat)
504{
505 u32 origbridge=*bridge_agpstat, origvga=*vga_agpstat;
506 u32 tmp;
507
508 if (*requested_mode & AGP3_RESERVED_MASK) {
509 printk (KERN_INFO PFX "reserved bits set in mode 0x%x. Fixed.\n", *requested_mode);
510 *requested_mode &= ~AGP3_RESERVED_MASK;
511 }
512
513 /* Check the speed bits make sense. */
514 tmp = *requested_mode & 7;
515 if (tmp == 0) {
516 printk (KERN_INFO PFX "%s tried to set rate=x0. Setting to AGP3 x4 mode.\n", current->comm);
517 *requested_mode |= AGPSTAT3_4X;
518 }
519 if (tmp >= 3) {
520 printk (KERN_INFO PFX "%s tried to set rate=x%d. Setting to AGP3 x8 mode.\n", current->comm, tmp * 4);
521 *requested_mode = (*requested_mode & ~7) | AGPSTAT3_8X;
522 }
523
524 /* ARQSZ - Set the value to the maximum one.
525 * Don't allow the mode register to override values. */
526 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_ARQSZ) |
527 max_t(u32,(*bridge_agpstat & AGPSTAT_ARQSZ),(*vga_agpstat & AGPSTAT_ARQSZ)));
528
529 /* Calibration cycle.
530 * Don't allow the mode register to override values. */
531 *bridge_agpstat = ((*bridge_agpstat & ~AGPSTAT_CAL_MASK) |
532 min_t(u32,(*bridge_agpstat & AGPSTAT_CAL_MASK),(*vga_agpstat & AGPSTAT_CAL_MASK)));
533
534 /* SBA *must* be supported for AGP v3 */
535 *bridge_agpstat |= AGPSTAT_SBA;
536
537 /*
538 * Set speed.
539 * Check for invalid speeds. This can happen when applications
540 * written before the AGP 3.0 standard pass AGP2.x modes to AGP3 hardware
541 */
542 if (*requested_mode & AGPSTAT_MODE_3_0) {
543 /*
544 * Caller hasn't a clue what it is doing. Bridge is in 3.0 mode,
545 * have been passed a 3.0 mode, but with 2.x speed bits set.
546 * AGP2.x 4x -> AGP3.0 4x.
547 */
548 if (*requested_mode & AGPSTAT2_4X) {
549 printk (KERN_INFO PFX "%s passes broken AGP3 flags (%x). Fixed.\n",
550 current->comm, *requested_mode);
551 *requested_mode &= ~AGPSTAT2_4X;
552 *requested_mode |= AGPSTAT3_4X;
553 }
554 } else {
555 /*
556 * The caller doesn't know what they are doing. We are in 3.0 mode,
557 * but have been passed an AGP 2.x mode.
558 * Convert AGP 1x,2x,4x -> AGP 3.0 4x.
559 */
560 printk (KERN_INFO PFX "%s passes broken AGP2 flags (%x) in AGP3 mode. Fixed.\n",
561 current->comm, *requested_mode);
562 *requested_mode &= ~(AGPSTAT2_4X | AGPSTAT2_2X | AGPSTAT2_1X);
563 *requested_mode |= AGPSTAT3_4X;
564 }
565
566 if (*requested_mode & AGPSTAT3_8X) {
567 if (!(*bridge_agpstat & AGPSTAT3_8X)) {
568 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
569 *bridge_agpstat |= AGPSTAT3_4X;
570 printk ("%s requested AGPx8 but bridge not capable.\n", current->comm);
571 return;
572 }
573 if (!(*vga_agpstat & AGPSTAT3_8X)) {
574 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
575 *bridge_agpstat |= AGPSTAT3_4X;
576 printk ("%s requested AGPx8 but graphic card not capable.\n", current->comm);
577 return;
578 }
579 /* All set, bridge & device can do AGP x8*/
580 *bridge_agpstat &= ~(AGPSTAT3_4X | AGPSTAT3_RSVD);
581 goto done;
582
583 } else {
584
585 /*
586 * If we didn't specify AGPx8, we can only do x4.
587 * If the hardware can't do x4, we're up shit creek, and never
588 * should have got this far.
589 */
590 *bridge_agpstat &= ~(AGPSTAT3_8X | AGPSTAT3_RSVD);
591 if ((*bridge_agpstat & AGPSTAT3_4X) && (*vga_agpstat & AGPSTAT3_4X))
592 *bridge_agpstat |= AGPSTAT3_4X;
593 else {
594 printk (KERN_INFO PFX "Badness. Don't know which AGP mode to set. "
595 "[bridge_agpstat:%x vga_agpstat:%x fell back to:- bridge_agpstat:%x vga_agpstat:%x]\n",
596 origbridge, origvga, *bridge_agpstat, *vga_agpstat);
597 if (!(*bridge_agpstat & AGPSTAT3_4X))
598 printk (KERN_INFO PFX "Bridge couldn't do AGP x4.\n");
599 if (!(*vga_agpstat & AGPSTAT3_4X))
600 printk (KERN_INFO PFX "Graphic card couldn't do AGP x4.\n");
601 return;
602 }
603 }
604
605done:
606 /* Apply any errata. */
607 if (agp_bridge->flags & AGP_ERRATA_FASTWRITES)
608 *bridge_agpstat &= ~AGPSTAT_FW;
609
610 if (agp_bridge->flags & AGP_ERRATA_SBA)
611 *bridge_agpstat &= ~AGPSTAT_SBA;
612
613 if (agp_bridge->flags & AGP_ERRATA_1X) {
614 *bridge_agpstat &= ~(AGPSTAT2_2X | AGPSTAT2_4X);
615 *bridge_agpstat |= AGPSTAT2_1X;
616 }
617}
618
619
620/**
621 * agp_collect_device_status - determine correct agp_cmd from various agp_stat's
622 * @bridge: an agp_bridge_data struct allocated for the AGP host bridge.
623 * @requested_mode: requested agp_stat from userspace (Typically from X)
624 * @bridge_agpstat: current agp_stat from AGP bridge.
625 *
626 * This function will hunt for an AGP graphics card, and try to match
627 * the requested mode to the capabilities of both the bridge and the card.
628 */
629u32 agp_collect_device_status(struct agp_bridge_data *bridge, u32 requested_mode, u32 bridge_agpstat)
630{
631 struct pci_dev *device = NULL;
632 u32 vga_agpstat;
633 u8 cap_ptr;
634
635 for (;;) {
636 device = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, device);
637 if (!device) {
638 printk (KERN_INFO PFX "Couldn't find an AGP VGA controller.\n");
639 return 0;
640 }
641 cap_ptr = pci_find_capability(device, PCI_CAP_ID_AGP);
642 if (cap_ptr)
643 break;
644 }
645
646 /*
647 * Ok, here we have a AGP device. Disable impossible
648 * settings, and adjust the readqueue to the minimum.
649 */
650 pci_read_config_dword(device, cap_ptr+PCI_AGP_STATUS, &vga_agpstat);
651
652 /* adjust RQ depth */
653 bridge_agpstat = ((bridge_agpstat & ~AGPSTAT_RQ_DEPTH) |
654 min_t(u32, (requested_mode & AGPSTAT_RQ_DEPTH),
655 min_t(u32, (bridge_agpstat & AGPSTAT_RQ_DEPTH), (vga_agpstat & AGPSTAT_RQ_DEPTH))));
656
657 /* disable FW if it's not supported */
658 if (!((bridge_agpstat & AGPSTAT_FW) &&
659 (vga_agpstat & AGPSTAT_FW) &&
660 (requested_mode & AGPSTAT_FW)))
661 bridge_agpstat &= ~AGPSTAT_FW;
662
663 /* Check to see if we are operating in 3.0 mode */
664 if (check_bridge_mode(agp_bridge->dev))
665 agp_v3_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
666 else
667 agp_v2_parse_one(&requested_mode, &bridge_agpstat, &vga_agpstat);
668
669 pci_dev_put(device);
670 return bridge_agpstat;
671}
672EXPORT_SYMBOL(agp_collect_device_status);
673
674
675void agp_device_command(u32 bridge_agpstat, int agp_v3)
676{
677 struct pci_dev *device = NULL;
678 int mode;
679
680 mode = bridge_agpstat & 0x7;
681 if (agp_v3)
682 mode *= 4;
683
684 for_each_pci_dev(device) {
685 u8 agp = pci_find_capability(device, PCI_CAP_ID_AGP);
686 if (!agp)
687 continue;
688
689 printk(KERN_INFO PFX "Putting AGP V%d device at %s into %dx mode\n",
690 agp_v3 ? 3 : 2, pci_name(device), mode);
691 pci_write_config_dword(device, agp + PCI_AGP_COMMAND, bridge_agpstat);
692 }
693}
694EXPORT_SYMBOL(agp_device_command);
695
696
697void get_agp_version(struct agp_bridge_data *bridge)
698{
699 u32 ncapid;
700
701 /* Exit early if already set by errata workarounds. */
702 if (bridge->major_version != 0)
703 return;
704
705 pci_read_config_dword(bridge->dev, bridge->capndx, &ncapid);
706 bridge->major_version = (ncapid >> AGP_MAJOR_VERSION_SHIFT) & 0xf;
707 bridge->minor_version = (ncapid >> AGP_MINOR_VERSION_SHIFT) & 0xf;
708}
709EXPORT_SYMBOL(get_agp_version);
710
711
712void agp_generic_enable(struct agp_bridge_data *bridge, u32 requested_mode)
713{
714 u32 bridge_agpstat, temp;
715
716 get_agp_version(agp_bridge);
717
718 printk(KERN_INFO PFX "Found an AGP %d.%d compliant device at %s.\n",
719 agp_bridge->major_version,
720 agp_bridge->minor_version,
721 pci_name(agp_bridge->dev));
722
723 pci_read_config_dword(agp_bridge->dev,
724 agp_bridge->capndx + PCI_AGP_STATUS, &bridge_agpstat);
725
726 bridge_agpstat = agp_collect_device_status(agp_bridge, requested_mode, bridge_agpstat);
727 if (bridge_agpstat == 0)
728 /* Something bad happened. FIXME: Return error code? */
729 return;
730
731 bridge_agpstat |= AGPSTAT_AGP_ENABLE;
732
733 /* Do AGP version specific frobbing. */
734 if (bridge->major_version >= 3) {
735 if (check_bridge_mode(bridge->dev)) {
736 /* If we have 3.5, we can do the isoch stuff. */
737 if (bridge->minor_version >= 5)
738 agp_3_5_enable(bridge);
739 agp_device_command(bridge_agpstat, TRUE);
740 return;
741 } else {
742 /* Disable calibration cycle in RX91<1> when not in AGP3.0 mode of operation.*/
743 bridge_agpstat &= ~(7<<10) ;
744 pci_read_config_dword(bridge->dev,
745 bridge->capndx+AGPCTRL, &temp);
746 temp |= (1<<9);
747 pci_write_config_dword(bridge->dev,
748 bridge->capndx+AGPCTRL, temp);
749
750 printk (KERN_INFO PFX "Device is in legacy mode,"
751 " falling back to 2.x\n");
752 }
753 }
754
755 /* AGP v<3 */
756 agp_device_command(bridge_agpstat, FALSE);
757}
758EXPORT_SYMBOL(agp_generic_enable);
759
760
761int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
762{
763 char *table;
764 char *table_end;
765 int size;
766 int page_order;
767 int num_entries;
768 int i;
769 void *temp;
770 struct page *page;
771
772 /* The generic routines can't handle 2 level gatt's */
773 if (bridge->driver->size_type == LVL2_APER_SIZE)
774 return -EINVAL;
775
776 table = NULL;
777 i = bridge->aperture_size_idx;
778 temp = bridge->current_size;
779 size = page_order = num_entries = 0;
780
781 if (bridge->driver->size_type != FIXED_APER_SIZE) {
782 do {
783 switch (bridge->driver->size_type) {
784 case U8_APER_SIZE:
785 size = A_SIZE_8(temp)->size;
786 page_order =
787 A_SIZE_8(temp)->page_order;
788 num_entries =
789 A_SIZE_8(temp)->num_entries;
790 break;
791 case U16_APER_SIZE:
792 size = A_SIZE_16(temp)->size;
793 page_order = A_SIZE_16(temp)->page_order;
794 num_entries = A_SIZE_16(temp)->num_entries;
795 break;
796 case U32_APER_SIZE:
797 size = A_SIZE_32(temp)->size;
798 page_order = A_SIZE_32(temp)->page_order;
799 num_entries = A_SIZE_32(temp)->num_entries;
800 break;
801 /* This case will never really happen. */
802 case FIXED_APER_SIZE:
803 case LVL2_APER_SIZE:
804 default:
805 size = page_order = num_entries = 0;
806 break;
807 }
808
809 table = (char *) __get_free_pages(GFP_KERNEL,
810 page_order);
811
812 if (table == NULL) {
813 i++;
814 switch (bridge->driver->size_type) {
815 case U8_APER_SIZE:
816 bridge->current_size = A_IDX8(bridge);
817 break;
818 case U16_APER_SIZE:
819 bridge->current_size = A_IDX16(bridge);
820 break;
821 case U32_APER_SIZE:
822 bridge->current_size = A_IDX32(bridge);
823 break;
824 /* This case will never really happen. */
825 case FIXED_APER_SIZE:
826 case LVL2_APER_SIZE:
827 default:
828 bridge->current_size =
829 bridge->current_size;
830 break;
831 }
832 temp = bridge->current_size;
833 } else {
834 bridge->aperture_size_idx = i;
835 }
836 } while (!table && (i < bridge->driver->num_aperture_sizes));
837 } else {
838 size = ((struct aper_size_info_fixed *) temp)->size;
839 page_order = ((struct aper_size_info_fixed *) temp)->page_order;
840 num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
841 table = (char *) __get_free_pages(GFP_KERNEL, page_order);
842 }
843
844 if (table == NULL)
845 return -ENOMEM;
846
847 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
848
849 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
850 SetPageReserved(page);
851
852 bridge->gatt_table_real = (u32 *) table;
853 agp_gatt_table = (void *)table;
854
855 bridge->driver->cache_flush();
856 bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
857 (PAGE_SIZE * (1 << page_order)));
858 bridge->driver->cache_flush();
859
860 if (bridge->gatt_table == NULL) {
861 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
862 ClearPageReserved(page);
863
864 free_pages((unsigned long) table, page_order);
865
866 return -ENOMEM;
867 }
868 bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
869
870 /* AK: bogus, should encode addresses > 4GB */
871 for (i = 0; i < num_entries; i++) {
872 writel(bridge->scratch_page, bridge->gatt_table+i);
873 readl(bridge->gatt_table+i); /* PCI Posting. */
874 }
875
876 return 0;
877}
878EXPORT_SYMBOL(agp_generic_create_gatt_table);
879
880int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
881{
882 int page_order;
883 char *table, *table_end;
884 void *temp;
885 struct page *page;
886
887 temp = bridge->current_size;
888
889 switch (bridge->driver->size_type) {
890 case U8_APER_SIZE:
891 page_order = A_SIZE_8(temp)->page_order;
892 break;
893 case U16_APER_SIZE:
894 page_order = A_SIZE_16(temp)->page_order;
895 break;
896 case U32_APER_SIZE:
897 page_order = A_SIZE_32(temp)->page_order;
898 break;
899 case FIXED_APER_SIZE:
900 page_order = A_SIZE_FIX(temp)->page_order;
901 break;
902 case LVL2_APER_SIZE:
903 /* The generic routines can't deal with 2 level gatt's */
904 return -EINVAL;
905 break;
906 default:
907 page_order = 0;
908 break;
909 }
910
911 /* Do not worry about freeing memory, because if this is
912 * called, then all agp memory is deallocated and removed
913 * from the table. */
914
915 iounmap(bridge->gatt_table);
916 table = (char *) bridge->gatt_table_real;
917 table_end = table + ((PAGE_SIZE * (1 << page_order)) - 1);
918
919 for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
920 ClearPageReserved(page);
921
922 free_pages((unsigned long) bridge->gatt_table_real, page_order);
923
924 agp_gatt_table = NULL;
925 bridge->gatt_table = NULL;
926 bridge->gatt_table_real = NULL;
927 bridge->gatt_bus_addr = 0;
928
929 return 0;
930}
931EXPORT_SYMBOL(agp_generic_free_gatt_table);
932
933
934int agp_generic_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
935{
936 int num_entries;
937 size_t i;
938 off_t j;
939 void *temp;
940 struct agp_bridge_data *bridge;
941
942 bridge = mem->bridge;
943 if (!bridge)
944 return -EINVAL;
945
946 temp = bridge->current_size;
947
948 switch (bridge->driver->size_type) {
949 case U8_APER_SIZE:
950 num_entries = A_SIZE_8(temp)->num_entries;
951 break;
952 case U16_APER_SIZE:
953 num_entries = A_SIZE_16(temp)->num_entries;
954 break;
955 case U32_APER_SIZE:
956 num_entries = A_SIZE_32(temp)->num_entries;
957 break;
958 case FIXED_APER_SIZE:
959 num_entries = A_SIZE_FIX(temp)->num_entries;
960 break;
961 case LVL2_APER_SIZE:
962 /* The generic routines can't deal with 2 level gatt's */
963 return -EINVAL;
964 break;
965 default:
966 num_entries = 0;
967 break;
968 }
969
970 num_entries -= agp_memory_reserved/PAGE_SIZE;
971 if (num_entries < 0) num_entries = 0;
972
973 if (type != 0 || mem->type != 0) {
974 /* The generic routines know nothing of memory types */
975 return -EINVAL;
976 }
977
978 /* AK: could wrap */
979 if ((pg_start + mem->page_count) > num_entries)
980 return -EINVAL;
981
982 j = pg_start;
983
984 while (j < (pg_start + mem->page_count)) {
985 if (!PGE_EMPTY(bridge, readl(bridge->gatt_table+j)))
986 return -EBUSY;
987 j++;
988 }
989
990 if (mem->is_flushed == FALSE) {
991 bridge->driver->cache_flush();
992 mem->is_flushed = TRUE;
993 }
994
995 for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
996 writel(bridge->driver->mask_memory(bridge, mem->memory[i], mem->type), bridge->gatt_table+j);
997 readl(bridge->gatt_table+j); /* PCI Posting. */
998 }
999
1000 bridge->driver->tlb_flush(mem);
1001 return 0;
1002}
1003EXPORT_SYMBOL(agp_generic_insert_memory);
1004
1005
1006int agp_generic_remove_memory(struct agp_memory *mem, off_t pg_start, int type)
1007{
1008 size_t i;
1009 struct agp_bridge_data *bridge;
1010
1011 bridge = mem->bridge;
1012 if (!bridge)
1013 return -EINVAL;
1014
1015 if (type != 0 || mem->type != 0) {
1016 /* The generic routines know nothing of memory types */
1017 return -EINVAL;
1018 }
1019
1020 /* AK: bogus, should encode addresses > 4GB */
1021 for (i = pg_start; i < (mem->page_count + pg_start); i++) {
1022 writel(bridge->scratch_page, bridge->gatt_table+i);
1023 readl(bridge->gatt_table+i); /* PCI Posting. */
1024 }
1025
1026 global_cache_flush();
1027 bridge->driver->tlb_flush(mem);
1028 return 0;
1029}
1030EXPORT_SYMBOL(agp_generic_remove_memory);
1031
1032
1033struct agp_memory *agp_generic_alloc_by_type(size_t page_count, int type)
1034{
1035 return NULL;
1036}
1037EXPORT_SYMBOL(agp_generic_alloc_by_type);
1038
1039
1040void agp_generic_free_by_type(struct agp_memory *curr)
1041{
1042 vfree(curr->memory);
1043 agp_free_key(curr->key);
1044 kfree(curr);
1045}
1046EXPORT_SYMBOL(agp_generic_free_by_type);
1047
1048
1049/*
1050 * Basic Page Allocation Routines -
1051 * These routines handle page allocation and by default they reserve the allocated
1052 * memory. They also handle incrementing the current_memory_agp value, Which is checked
1053 * against a maximum value.
1054 */
1055
1056void *agp_generic_alloc_page(struct agp_bridge_data *bridge)
1057{
1058 struct page * page;
1059
1060 page = alloc_page(GFP_KERNEL);
1061 if (page == NULL)
1062 return NULL;
1063
1064 map_page_into_agp(page);
1065
1066 get_page(page);
1067 SetPageLocked(page);
1068 atomic_inc(&agp_bridge->current_memory_agp);
1069 return page_address(page);
1070}
1071EXPORT_SYMBOL(agp_generic_alloc_page);
1072
1073
1074void agp_generic_destroy_page(void *addr)
1075{
1076 struct page *page;
1077
1078 if (addr == NULL)
1079 return;
1080
1081 page = virt_to_page(addr);
1082 unmap_page_from_agp(page);
1083 put_page(page);
1084 unlock_page(page);
1085 free_page((unsigned long)addr);
1086 atomic_dec(&agp_bridge->current_memory_agp);
1087}
1088EXPORT_SYMBOL(agp_generic_destroy_page);
1089
1090/* End Basic Page Allocation Routines */
1091
1092
1093/**
1094 * agp_enable - initialise the agp point-to-point connection.
1095 *
1096 * @mode: agp mode register value to configure with.
1097 */
1098void agp_enable(struct agp_bridge_data *bridge, u32 mode)
1099{
1100 if (!bridge)
1101 return;
1102 bridge->driver->agp_enable(bridge, mode);
1103}
1104EXPORT_SYMBOL(agp_enable);
1105
1106/* When we remove the global variable agp_bridge from all drivers
1107 * then agp_alloc_bridge and agp_generic_find_bridge need to be updated
1108 */
1109
1110struct agp_bridge_data *agp_generic_find_bridge(struct pci_dev *pdev)
1111{
1112 if (list_empty(&agp_bridges))
1113 return NULL;
1114
1115 return agp_bridge;
1116}
1117
1118static void ipi_handler(void *null)
1119{
1120 flush_agp_cache();
1121}
1122
1123void global_cache_flush(void)
1124{
1125 if (on_each_cpu(ipi_handler, NULL, 1, 1) != 0)
1126 panic(PFX "timed out waiting for the other CPUs!\n");
1127}
1128EXPORT_SYMBOL(global_cache_flush);
1129
1130unsigned long agp_generic_mask_memory(struct agp_bridge_data *bridge,
1131 unsigned long addr, int type)
1132{
1133 /* memory type is ignored in the generic routine */
1134 if (bridge->driver->masks)
1135 return addr | bridge->driver->masks[0].mask;
1136 else
1137 return addr;
1138}
1139EXPORT_SYMBOL(agp_generic_mask_memory);
1140
1141/*
1142 * These functions are implemented according to the AGPv3 spec,
1143 * which covers implementation details that had previously been
1144 * left open.
1145 */
1146
1147int agp3_generic_fetch_size(void)
1148{
1149 u16 temp_size;
1150 int i;
1151 struct aper_size_info_16 *values;
1152
1153 pci_read_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, &temp_size);
1154 values = A_SIZE_16(agp_bridge->driver->aperture_sizes);
1155
1156 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
1157 if (temp_size == values[i].size_value) {
1158 agp_bridge->previous_size =
1159 agp_bridge->current_size = (void *) (values + i);
1160
1161 agp_bridge->aperture_size_idx = i;
1162 return values[i].size;
1163 }
1164 }
1165 return 0;
1166}
1167EXPORT_SYMBOL(agp3_generic_fetch_size);
1168
1169void agp3_generic_tlbflush(struct agp_memory *mem)
1170{
1171 u32 ctrl;
1172 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1173 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_GTLBEN);
1174 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl);
1175}
1176EXPORT_SYMBOL(agp3_generic_tlbflush);
1177
1178int agp3_generic_configure(void)
1179{
1180 u32 temp;
1181 struct aper_size_info_16 *current_size;
1182
1183 current_size = A_SIZE_16(agp_bridge->current_size);
1184
1185 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
1186 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
1187
1188 /* set aperture size */
1189 pci_write_config_word(agp_bridge->dev, agp_bridge->capndx+AGPAPSIZE, current_size->size_value);
1190 /* set gart pointer */
1191 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPGARTLO, agp_bridge->gatt_bus_addr);
1192 /* enable aperture and GTLB */
1193 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &temp);
1194 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, temp | AGPCTRL_APERENB | AGPCTRL_GTLBEN);
1195 return 0;
1196}
1197EXPORT_SYMBOL(agp3_generic_configure);
1198
1199void agp3_generic_cleanup(void)
1200{
1201 u32 ctrl;
1202 pci_read_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, &ctrl);
1203 pci_write_config_dword(agp_bridge->dev, agp_bridge->capndx+AGPCTRL, ctrl & ~AGPCTRL_APERENB);
1204}
1205EXPORT_SYMBOL(agp3_generic_cleanup);
1206
1207struct aper_size_info_16 agp3_generic_sizes[AGP_GENERIC_SIZES_ENTRIES] =
1208{
1209 {4096, 1048576, 10,0x000},
1210 {2048, 524288, 9, 0x800},
1211 {1024, 262144, 8, 0xc00},
1212 { 512, 131072, 7, 0xe00},
1213 { 256, 65536, 6, 0xf00},
1214 { 128, 32768, 5, 0xf20},
1215 { 64, 16384, 4, 0xf30},
1216 { 32, 8192, 3, 0xf38},
1217 { 16, 4096, 2, 0xf3c},
1218 { 8, 2048, 1, 0xf3e},
1219 { 4, 1024, 0, 0xf3f}
1220};
1221EXPORT_SYMBOL(agp3_generic_sizes);
1222
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 11:07:11 -0500