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1/*
2 * Copyright (c) 2007, Intel Corporation.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Authors: Thomas Hellstrom <thomas-at-tungstengraphics.com>
19 * Alan Cox <alan@linux.intel.com>
20 */
21
22#include <drm/drmP.h>
23#include <linux/shmem_fs.h>
24#include "psb_drv.h"
25#include "blitter.h"
26
27
28/*
29 * GTT resource allocator - manage page mappings in GTT space
30 */
31
32/**
33 * psb_gtt_mask_pte - generate GTT pte entry
34 * @pfn: page number to encode
35 * @type: type of memory in the GTT
36 *
37 * Set the GTT entry for the appropriate memory type.
38 */
39static inline uint32_t psb_gtt_mask_pte(uint32_t pfn, int type)
40{
41 uint32_t mask = PSB_PTE_VALID;
42
43 /* Ensure we explode rather than put an invalid low mapping of
44 a high mapping page into the gtt */
45 BUG_ON(pfn & ~(0xFFFFFFFF >> PAGE_SHIFT));
46
47 if (type & PSB_MMU_CACHED_MEMORY)
48 mask |= PSB_PTE_CACHED;
49 if (type & PSB_MMU_RO_MEMORY)
50 mask |= PSB_PTE_RO;
51 if (type & PSB_MMU_WO_MEMORY)
52 mask |= PSB_PTE_WO;
53
54 return (pfn << PAGE_SHIFT) | mask;
55}
56
57/**
58 * psb_gtt_entry - find the GTT entries for a gtt_range
59 * @dev: our DRM device
60 * @r: our GTT range
61 *
62 * Given a gtt_range object return the GTT offset of the page table
63 * entries for this gtt_range
64 */
65static u32 __iomem *psb_gtt_entry(struct drm_device *dev, struct gtt_range *r)
66{
67 struct drm_psb_private *dev_priv = dev->dev_private;
68 unsigned long offset;
69
70 offset = r->resource.start - dev_priv->gtt_mem->start;
71
72 return dev_priv->gtt_map + (offset >> PAGE_SHIFT);
73}
74
75/**
76 * psb_gtt_insert - put an object into the GTT
77 * @dev: our DRM device
78 * @r: our GTT range
79 *
80 * Take our preallocated GTT range and insert the GEM object into
81 * the GTT. This is protected via the gtt mutex which the caller
82 * must hold.
83 */
84static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r,
85 int resume)
86{
87 u32 __iomem *gtt_slot;
88 u32 pte;
89 struct page **pages;
90 int i;
91
92 if (r->pages == NULL) {
93 WARN_ON(1);
94 return -EINVAL;
95 }
96
97 WARN_ON(r->stolen); /* refcount these maybe ? */
98
99 gtt_slot = psb_gtt_entry(dev, r);
100 pages = r->pages;
101
102 if (!resume) {
103 /* Make sure changes are visible to the GPU */
104 set_pages_array_wc(pages, r->npage);
105 }
106
107 /* Write our page entries into the GTT itself */
108 for (i = r->roll; i < r->npage; i++) {
109 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
110 PSB_MMU_CACHED_MEMORY);
111 iowrite32(pte, gtt_slot++);
112 }
113 for (i = 0; i < r->roll; i++) {
114 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
115 PSB_MMU_CACHED_MEMORY);
116 iowrite32(pte, gtt_slot++);
117 }
118 /* Make sure all the entries are set before we return */
119 ioread32(gtt_slot - 1);
120
121 return 0;
122}
123
124/**
125 * psb_gtt_remove - remove an object from the GTT
126 * @dev: our DRM device
127 * @r: our GTT range
128 *
129 * Remove a preallocated GTT range from the GTT. Overwrite all the
130 * page table entries with the dummy page. This is protected via the gtt
131 * mutex which the caller must hold.
132 */
133void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
134{
135 struct drm_psb_private *dev_priv = dev->dev_private;
136 u32 __iomem *gtt_slot;
137 u32 pte;
138 int i;
139
140 WARN_ON(r->stolen);
141
142 gtt_slot = psb_gtt_entry(dev, r);
143 pte = psb_gtt_mask_pte(page_to_pfn(dev_priv->scratch_page),
144 PSB_MMU_CACHED_MEMORY);
145
146 for (i = 0; i < r->npage; i++)
147 iowrite32(pte, gtt_slot++);
148 ioread32(gtt_slot - 1);
149 set_pages_array_wb(r->pages, r->npage);
150}
151
152/**
153 * psb_gtt_roll - set scrolling position
154 * @dev: our DRM device
155 * @r: the gtt mapping we are using
156 * @roll: roll offset
157 *
158 * Roll an existing pinned mapping by moving the pages through the GTT.
159 * This allows us to implement hardware scrolling on the consoles without
160 * a 2D engine
161 */
162void psb_gtt_roll(struct drm_device *dev, struct gtt_range *r, int roll)
163{
164 u32 __iomem *gtt_slot;
165 u32 pte;
166 int i;
167
168 if (roll >= r->npage) {
169 WARN_ON(1);
170 return;
171 }
172
173 r->roll = roll;
174
175 /* Not currently in the GTT - no worry we will write the mapping at
176 the right position when it gets pinned */
177 if (!r->stolen && !r->in_gart)
178 return;
179
180 gtt_slot = psb_gtt_entry(dev, r);
181
182 for (i = r->roll; i < r->npage; i++) {
183 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
184 PSB_MMU_CACHED_MEMORY);
185 iowrite32(pte, gtt_slot++);
186 }
187 for (i = 0; i < r->roll; i++) {
188 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
189 PSB_MMU_CACHED_MEMORY);
190 iowrite32(pte, gtt_slot++);
191 }
192 ioread32(gtt_slot - 1);
193}
194
195/**
196 * psb_gtt_attach_pages - attach and pin GEM pages
197 * @gt: the gtt range
198 *
199 * Pin and build an in kernel list of the pages that back our GEM object.
200 * While we hold this the pages cannot be swapped out. This is protected
201 * via the gtt mutex which the caller must hold.
202 */
203static int psb_gtt_attach_pages(struct gtt_range *gt)
204{
205 struct page **pages;
206
207 WARN_ON(gt->pages);
208
209 pages = drm_gem_get_pages(>->gem);
210 if (IS_ERR(pages))
211 return PTR_ERR(pages);
212
213 gt->npage = gt->gem.size / PAGE_SIZE;
214 gt->pages = pages;
215
216 return 0;
217}
218
219/**
220 * psb_gtt_detach_pages - attach and pin GEM pages
221 * @gt: the gtt range
222 *
223 * Undo the effect of psb_gtt_attach_pages. At this point the pages
224 * must have been removed from the GTT as they could now be paged out
225 * and move bus address. This is protected via the gtt mutex which the
226 * caller must hold.
227 */
228static void psb_gtt_detach_pages(struct gtt_range *gt)
229{
230 drm_gem_put_pages(>->gem, gt->pages, true, false);
231 gt->pages = NULL;
232}
233
234/**
235 * psb_gtt_pin - pin pages into the GTT
236 * @gt: range to pin
237 *
238 * Pin a set of pages into the GTT. The pins are refcounted so that
239 * multiple pins need multiple unpins to undo.
240 *
241 * Non GEM backed objects treat this as a no-op as they are always GTT
242 * backed objects.
243 */
244int psb_gtt_pin(struct gtt_range *gt)
245{
246 int ret = 0;
247 struct drm_device *dev = gt->gem.dev;
248 struct drm_psb_private *dev_priv = dev->dev_private;
249 u32 gpu_base = dev_priv->gtt.gatt_start;
250
251 mutex_lock(&dev_priv->gtt_mutex);
252
253 if (gt->in_gart == 0 && gt->stolen == 0) {
254 ret = psb_gtt_attach_pages(gt);
255 if (ret < 0)
256 goto out;
257 ret = psb_gtt_insert(dev, gt, 0);
258 if (ret < 0) {
259 psb_gtt_detach_pages(gt);
260 goto out;
261 }
262 psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu),
263 gt->pages, (gpu_base + gt->offset),
264 gt->npage, 0, 0, PSB_MMU_CACHED_MEMORY);
265 }
266 gt->in_gart++;
267out:
268 mutex_unlock(&dev_priv->gtt_mutex);
269 return ret;
270}
271
272/**
273 * psb_gtt_unpin - Drop a GTT pin requirement
274 * @gt: range to pin
275 *
276 * Undoes the effect of psb_gtt_pin. On the last drop the GEM object
277 * will be removed from the GTT which will also drop the page references
278 * and allow the VM to clean up or page stuff.
279 *
280 * Non GEM backed objects treat this as a no-op as they are always GTT
281 * backed objects.
282 */
283void psb_gtt_unpin(struct gtt_range *gt)
284{
285 struct drm_device *dev = gt->gem.dev;
286 struct drm_psb_private *dev_priv = dev->dev_private;
287 u32 gpu_base = dev_priv->gtt.gatt_start;
288 int ret;
289
290 /* While holding the gtt_mutex no new blits can be initiated */
291 mutex_lock(&dev_priv->gtt_mutex);
292
293 /* Wait for any possible usage of the memory to be finished */
294 ret = gma_blt_wait_idle(dev_priv);
295 if (ret) {
296 DRM_ERROR("Failed to idle the blitter, unpin failed!");
297 goto out;
298 }
299
300 WARN_ON(!gt->in_gart);
301
302 gt->in_gart--;
303 if (gt->in_gart == 0 && gt->stolen == 0) {
304 psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
305 (gpu_base + gt->offset), gt->npage, 0, 0);
306 psb_gtt_remove(dev, gt);
307 psb_gtt_detach_pages(gt);
308 }
309
310out:
311 mutex_unlock(&dev_priv->gtt_mutex);
312}
313
314/*
315 * GTT resource allocator - allocate and manage GTT address space
316 */
317
318/**
319 * psb_gtt_alloc_range - allocate GTT address space
320 * @dev: Our DRM device
321 * @len: length (bytes) of address space required
322 * @name: resource name
323 * @backed: resource should be backed by stolen pages
324 *
325 * Ask the kernel core to find us a suitable range of addresses
326 * to use for a GTT mapping.
327 *
328 * Returns a gtt_range structure describing the object, or NULL on
329 * error. On successful return the resource is both allocated and marked
330 * as in use.
331 */
332struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
333 const char *name, int backed, u32 align)
334{
335 struct drm_psb_private *dev_priv = dev->dev_private;
336 struct gtt_range *gt;
337 struct resource *r = dev_priv->gtt_mem;
338 int ret;
339 unsigned long start, end;
340
341 if (backed) {
342 /* The start of the GTT is the stolen pages */
343 start = r->start;
344 end = r->start + dev_priv->gtt.stolen_size - 1;
345 } else {
346 /* The rest we will use for GEM backed objects */
347 start = r->start + dev_priv->gtt.stolen_size;
348 end = r->end;
349 }
350
351 gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL);
352 if (gt == NULL)
353 return NULL;
354 gt->resource.name = name;
355 gt->stolen = backed;
356 gt->in_gart = backed;
357 gt->roll = 0;
358 /* Ensure this is set for non GEM objects */
359 gt->gem.dev = dev;
360 ret = allocate_resource(dev_priv->gtt_mem, >->resource,
361 len, start, end, align, NULL, NULL);
362 if (ret == 0) {
363 gt->offset = gt->resource.start - r->start;
364 return gt;
365 }
366 kfree(gt);
367 return NULL;
368}
369
370/**
371 * psb_gtt_free_range - release GTT address space
372 * @dev: our DRM device
373 * @gt: a mapping created with psb_gtt_alloc_range
374 *
375 * Release a resource that was allocated with psb_gtt_alloc_range. If the
376 * object has been pinned by mmap users we clean this up here currently.
377 */
378void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
379{
380 /* Undo the mmap pin if we are destroying the object */
381 if (gt->mmapping) {
382 psb_gtt_unpin(gt);
383 gt->mmapping = 0;
384 }
385 WARN_ON(gt->in_gart && !gt->stolen);
386 release_resource(>->resource);
387 kfree(gt);
388}
389
390static void psb_gtt_alloc(struct drm_device *dev)
391{
392 struct drm_psb_private *dev_priv = dev->dev_private;
393 init_rwsem(&dev_priv->gtt.sem);
394}
395
396void psb_gtt_takedown(struct drm_device *dev)
397{
398 struct drm_psb_private *dev_priv = dev->dev_private;
399
400 if (dev_priv->gtt_map) {
401 iounmap(dev_priv->gtt_map);
402 dev_priv->gtt_map = NULL;
403 }
404 if (dev_priv->gtt_initialized) {
405 pci_write_config_word(dev->pdev, PSB_GMCH_CTRL,
406 dev_priv->gmch_ctrl);
407 PSB_WVDC32(dev_priv->pge_ctl, PSB_PGETBL_CTL);
408 (void) PSB_RVDC32(PSB_PGETBL_CTL);
409 }
410 if (dev_priv->vram_addr)
411 iounmap(dev_priv->gtt_map);
412}
413
414int psb_gtt_init(struct drm_device *dev, int resume)
415{
416 struct drm_psb_private *dev_priv = dev->dev_private;
417 unsigned gtt_pages;
418 unsigned long stolen_size, vram_stolen_size;
419 unsigned i, num_pages;
420 unsigned pfn_base;
421 struct psb_gtt *pg;
422
423 int ret = 0;
424 uint32_t pte;
425
426 if (!resume) {
427 mutex_init(&dev_priv->gtt_mutex);
428 mutex_init(&dev_priv->mmap_mutex);
429 psb_gtt_alloc(dev);
430 }
431
432 pg = &dev_priv->gtt;
433
434 /* Enable the GTT */
435 pci_read_config_word(dev->pdev, PSB_GMCH_CTRL, &dev_priv->gmch_ctrl);
436 pci_write_config_word(dev->pdev, PSB_GMCH_CTRL,
437 dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
438
439 dev_priv->pge_ctl = PSB_RVDC32(PSB_PGETBL_CTL);
440 PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
441 (void) PSB_RVDC32(PSB_PGETBL_CTL);
442
443 /* The root resource we allocate address space from */
444 dev_priv->gtt_initialized = 1;
445
446 pg->gtt_phys_start = dev_priv->pge_ctl & PAGE_MASK;
447
448 /*
449 * The video mmu has a hw bug when accessing 0x0D0000000.
450 * Make gatt start at 0x0e000,0000. This doesn't actually
451 * matter for us but may do if the video acceleration ever
452 * gets opened up.
453 */
454 pg->mmu_gatt_start = 0xE0000000;
455
456 pg->gtt_start = pci_resource_start(dev->pdev, PSB_GTT_RESOURCE);
457 gtt_pages = pci_resource_len(dev->pdev, PSB_GTT_RESOURCE)
458 >> PAGE_SHIFT;
459 /* CDV doesn't report this. In which case the system has 64 gtt pages */
460 if (pg->gtt_start == 0 || gtt_pages == 0) {
461 dev_dbg(dev->dev, "GTT PCI BAR not initialized.\n");
462 gtt_pages = 64;
463 pg->gtt_start = dev_priv->pge_ctl;
464 }
465
466 pg->gatt_start = pci_resource_start(dev->pdev, PSB_GATT_RESOURCE);
467 pg->gatt_pages = pci_resource_len(dev->pdev, PSB_GATT_RESOURCE)
468 >> PAGE_SHIFT;
469 dev_priv->gtt_mem = &dev->pdev->resource[PSB_GATT_RESOURCE];
470
471 if (pg->gatt_pages == 0 || pg->gatt_start == 0) {
472 static struct resource fudge; /* Preferably peppermint */
473 /* This can occur on CDV systems. Fudge it in this case.
474 We really don't care what imaginary space is being allocated
475 at this point */
476 dev_dbg(dev->dev, "GATT PCI BAR not initialized.\n");
477 pg->gatt_start = 0x40000000;
478 pg->gatt_pages = (128 * 1024 * 1024) >> PAGE_SHIFT;
479 /* This is a little confusing but in fact the GTT is providing
480 a view from the GPU into memory and not vice versa. As such
481 this is really allocating space that is not the same as the
482 CPU address space on CDV */
483 fudge.start = 0x40000000;
484 fudge.end = 0x40000000 + 128 * 1024 * 1024 - 1;
485 fudge.name = "fudge";
486 fudge.flags = IORESOURCE_MEM;
487 dev_priv->gtt_mem = &fudge;
488 }
489
490 pci_read_config_dword(dev->pdev, PSB_BSM, &dev_priv->stolen_base);
491 vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base
492 - PAGE_SIZE;
493
494 stolen_size = vram_stolen_size;
495
496 dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n",
497 dev_priv->stolen_base, vram_stolen_size / 1024);
498
499 if (resume && (gtt_pages != pg->gtt_pages) &&
500 (stolen_size != pg->stolen_size)) {
501 dev_err(dev->dev, "GTT resume error.\n");
502 ret = -EINVAL;
503 goto out_err;
504 }
505
506 pg->gtt_pages = gtt_pages;
507 pg->stolen_size = stolen_size;
508 dev_priv->vram_stolen_size = vram_stolen_size;
509
510 /*
511 * Map the GTT and the stolen memory area
512 */
513 if (!resume)
514 dev_priv->gtt_map = ioremap_nocache(pg->gtt_phys_start,
515 gtt_pages << PAGE_SHIFT);
516 if (!dev_priv->gtt_map) {
517 dev_err(dev->dev, "Failure to map gtt.\n");
518 ret = -ENOMEM;
519 goto out_err;
520 }
521
522 if (!resume)
523 dev_priv->vram_addr = ioremap_wc(dev_priv->stolen_base,
524 stolen_size);
525
526 if (!dev_priv->vram_addr) {
527 dev_err(dev->dev, "Failure to map stolen base.\n");
528 ret = -ENOMEM;
529 goto out_err;
530 }
531
532 /*
533 * Insert vram stolen pages into the GTT
534 */
535
536 pfn_base = dev_priv->stolen_base >> PAGE_SHIFT;
537 num_pages = vram_stolen_size >> PAGE_SHIFT;
538 dev_dbg(dev->dev, "Set up %d stolen pages starting at 0x%08x, GTT offset %dK\n",
539 num_pages, pfn_base << PAGE_SHIFT, 0);
540 for (i = 0; i < num_pages; ++i) {
541 pte = psb_gtt_mask_pte(pfn_base + i, PSB_MMU_CACHED_MEMORY);
542 iowrite32(pte, dev_priv->gtt_map + i);
543 }
544
545 /*
546 * Init rest of GTT to the scratch page to avoid accidents or scribbles
547 */
548
549 pfn_base = page_to_pfn(dev_priv->scratch_page);
550 pte = psb_gtt_mask_pte(pfn_base, PSB_MMU_CACHED_MEMORY);
551 for (; i < gtt_pages; ++i)
552 iowrite32(pte, dev_priv->gtt_map + i);
553
554 (void) ioread32(dev_priv->gtt_map + i - 1);
555 return 0;
556
557out_err:
558 psb_gtt_takedown(dev);
559 return ret;
560}
561
562int psb_gtt_restore(struct drm_device *dev)
563{
564 struct drm_psb_private *dev_priv = dev->dev_private;
565 struct resource *r = dev_priv->gtt_mem->child;
566 struct gtt_range *range;
567 unsigned int restored = 0, total = 0, size = 0;
568
569 /* On resume, the gtt_mutex is already initialized */
570 mutex_lock(&dev_priv->gtt_mutex);
571 psb_gtt_init(dev, 1);
572
573 while (r != NULL) {
574 range = container_of(r, struct gtt_range, resource);
575 if (range->pages) {
576 psb_gtt_insert(dev, range, 1);
577 size += range->resource.end - range->resource.start;
578 restored++;
579 }
580 r = r->sibling;
581 total++;
582 }
583 mutex_unlock(&dev_priv->gtt_mutex);
584 DRM_DEBUG_DRIVER("Restored %u of %u gtt ranges (%u KB)", restored,
585 total, (size / 1024));
586
587 return 0;
588}
1/*
2 * Copyright (c) 2007, Intel Corporation.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
17 *
18 * Authors: Thomas Hellstrom <thomas-at-tungstengraphics.com>
19 * Alan Cox <alan@linux.intel.com>
20 */
21
22#include <drm/drmP.h>
23#include <linux/shmem_fs.h>
24#include <asm/set_memory.h>
25#include "psb_drv.h"
26#include "blitter.h"
27
28
29/*
30 * GTT resource allocator - manage page mappings in GTT space
31 */
32
33/**
34 * psb_gtt_mask_pte - generate GTT pte entry
35 * @pfn: page number to encode
36 * @type: type of memory in the GTT
37 *
38 * Set the GTT entry for the appropriate memory type.
39 */
40static inline uint32_t psb_gtt_mask_pte(uint32_t pfn, int type)
41{
42 uint32_t mask = PSB_PTE_VALID;
43
44 /* Ensure we explode rather than put an invalid low mapping of
45 a high mapping page into the gtt */
46 BUG_ON(pfn & ~(0xFFFFFFFF >> PAGE_SHIFT));
47
48 if (type & PSB_MMU_CACHED_MEMORY)
49 mask |= PSB_PTE_CACHED;
50 if (type & PSB_MMU_RO_MEMORY)
51 mask |= PSB_PTE_RO;
52 if (type & PSB_MMU_WO_MEMORY)
53 mask |= PSB_PTE_WO;
54
55 return (pfn << PAGE_SHIFT) | mask;
56}
57
58/**
59 * psb_gtt_entry - find the GTT entries for a gtt_range
60 * @dev: our DRM device
61 * @r: our GTT range
62 *
63 * Given a gtt_range object return the GTT offset of the page table
64 * entries for this gtt_range
65 */
66static u32 __iomem *psb_gtt_entry(struct drm_device *dev, struct gtt_range *r)
67{
68 struct drm_psb_private *dev_priv = dev->dev_private;
69 unsigned long offset;
70
71 offset = r->resource.start - dev_priv->gtt_mem->start;
72
73 return dev_priv->gtt_map + (offset >> PAGE_SHIFT);
74}
75
76/**
77 * psb_gtt_insert - put an object into the GTT
78 * @dev: our DRM device
79 * @r: our GTT range
80 * @resume: on resume
81 *
82 * Take our preallocated GTT range and insert the GEM object into
83 * the GTT. This is protected via the gtt mutex which the caller
84 * must hold.
85 */
86static int psb_gtt_insert(struct drm_device *dev, struct gtt_range *r,
87 int resume)
88{
89 u32 __iomem *gtt_slot;
90 u32 pte;
91 struct page **pages;
92 int i;
93
94 if (r->pages == NULL) {
95 WARN_ON(1);
96 return -EINVAL;
97 }
98
99 WARN_ON(r->stolen); /* refcount these maybe ? */
100
101 gtt_slot = psb_gtt_entry(dev, r);
102 pages = r->pages;
103
104 if (!resume) {
105 /* Make sure changes are visible to the GPU */
106 set_pages_array_wc(pages, r->npage);
107 }
108
109 /* Write our page entries into the GTT itself */
110 for (i = r->roll; i < r->npage; i++) {
111 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
112 PSB_MMU_CACHED_MEMORY);
113 iowrite32(pte, gtt_slot++);
114 }
115 for (i = 0; i < r->roll; i++) {
116 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
117 PSB_MMU_CACHED_MEMORY);
118 iowrite32(pte, gtt_slot++);
119 }
120 /* Make sure all the entries are set before we return */
121 ioread32(gtt_slot - 1);
122
123 return 0;
124}
125
126/**
127 * psb_gtt_remove - remove an object from the GTT
128 * @dev: our DRM device
129 * @r: our GTT range
130 *
131 * Remove a preallocated GTT range from the GTT. Overwrite all the
132 * page table entries with the dummy page. This is protected via the gtt
133 * mutex which the caller must hold.
134 */
135static void psb_gtt_remove(struct drm_device *dev, struct gtt_range *r)
136{
137 struct drm_psb_private *dev_priv = dev->dev_private;
138 u32 __iomem *gtt_slot;
139 u32 pte;
140 int i;
141
142 WARN_ON(r->stolen);
143
144 gtt_slot = psb_gtt_entry(dev, r);
145 pte = psb_gtt_mask_pte(page_to_pfn(dev_priv->scratch_page),
146 PSB_MMU_CACHED_MEMORY);
147
148 for (i = 0; i < r->npage; i++)
149 iowrite32(pte, gtt_slot++);
150 ioread32(gtt_slot - 1);
151 set_pages_array_wb(r->pages, r->npage);
152}
153
154/**
155 * psb_gtt_roll - set scrolling position
156 * @dev: our DRM device
157 * @r: the gtt mapping we are using
158 * @roll: roll offset
159 *
160 * Roll an existing pinned mapping by moving the pages through the GTT.
161 * This allows us to implement hardware scrolling on the consoles without
162 * a 2D engine
163 */
164void psb_gtt_roll(struct drm_device *dev, struct gtt_range *r, int roll)
165{
166 u32 __iomem *gtt_slot;
167 u32 pte;
168 int i;
169
170 if (roll >= r->npage) {
171 WARN_ON(1);
172 return;
173 }
174
175 r->roll = roll;
176
177 /* Not currently in the GTT - no worry we will write the mapping at
178 the right position when it gets pinned */
179 if (!r->stolen && !r->in_gart)
180 return;
181
182 gtt_slot = psb_gtt_entry(dev, r);
183
184 for (i = r->roll; i < r->npage; i++) {
185 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
186 PSB_MMU_CACHED_MEMORY);
187 iowrite32(pte, gtt_slot++);
188 }
189 for (i = 0; i < r->roll; i++) {
190 pte = psb_gtt_mask_pte(page_to_pfn(r->pages[i]),
191 PSB_MMU_CACHED_MEMORY);
192 iowrite32(pte, gtt_slot++);
193 }
194 ioread32(gtt_slot - 1);
195}
196
197/**
198 * psb_gtt_attach_pages - attach and pin GEM pages
199 * @gt: the gtt range
200 *
201 * Pin and build an in kernel list of the pages that back our GEM object.
202 * While we hold this the pages cannot be swapped out. This is protected
203 * via the gtt mutex which the caller must hold.
204 */
205static int psb_gtt_attach_pages(struct gtt_range *gt)
206{
207 struct page **pages;
208
209 WARN_ON(gt->pages);
210
211 pages = drm_gem_get_pages(>->gem);
212 if (IS_ERR(pages))
213 return PTR_ERR(pages);
214
215 gt->npage = gt->gem.size / PAGE_SIZE;
216 gt->pages = pages;
217
218 return 0;
219}
220
221/**
222 * psb_gtt_detach_pages - attach and pin GEM pages
223 * @gt: the gtt range
224 *
225 * Undo the effect of psb_gtt_attach_pages. At this point the pages
226 * must have been removed from the GTT as they could now be paged out
227 * and move bus address. This is protected via the gtt mutex which the
228 * caller must hold.
229 */
230static void psb_gtt_detach_pages(struct gtt_range *gt)
231{
232 drm_gem_put_pages(>->gem, gt->pages, true, false);
233 gt->pages = NULL;
234}
235
236/**
237 * psb_gtt_pin - pin pages into the GTT
238 * @gt: range to pin
239 *
240 * Pin a set of pages into the GTT. The pins are refcounted so that
241 * multiple pins need multiple unpins to undo.
242 *
243 * Non GEM backed objects treat this as a no-op as they are always GTT
244 * backed objects.
245 */
246int psb_gtt_pin(struct gtt_range *gt)
247{
248 int ret = 0;
249 struct drm_device *dev = gt->gem.dev;
250 struct drm_psb_private *dev_priv = dev->dev_private;
251 u32 gpu_base = dev_priv->gtt.gatt_start;
252
253 mutex_lock(&dev_priv->gtt_mutex);
254
255 if (gt->in_gart == 0 && gt->stolen == 0) {
256 ret = psb_gtt_attach_pages(gt);
257 if (ret < 0)
258 goto out;
259 ret = psb_gtt_insert(dev, gt, 0);
260 if (ret < 0) {
261 psb_gtt_detach_pages(gt);
262 goto out;
263 }
264 psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu),
265 gt->pages, (gpu_base + gt->offset),
266 gt->npage, 0, 0, PSB_MMU_CACHED_MEMORY);
267 }
268 gt->in_gart++;
269out:
270 mutex_unlock(&dev_priv->gtt_mutex);
271 return ret;
272}
273
274/**
275 * psb_gtt_unpin - Drop a GTT pin requirement
276 * @gt: range to pin
277 *
278 * Undoes the effect of psb_gtt_pin. On the last drop the GEM object
279 * will be removed from the GTT which will also drop the page references
280 * and allow the VM to clean up or page stuff.
281 *
282 * Non GEM backed objects treat this as a no-op as they are always GTT
283 * backed objects.
284 */
285void psb_gtt_unpin(struct gtt_range *gt)
286{
287 struct drm_device *dev = gt->gem.dev;
288 struct drm_psb_private *dev_priv = dev->dev_private;
289 u32 gpu_base = dev_priv->gtt.gatt_start;
290 int ret;
291
292 /* While holding the gtt_mutex no new blits can be initiated */
293 mutex_lock(&dev_priv->gtt_mutex);
294
295 /* Wait for any possible usage of the memory to be finished */
296 ret = gma_blt_wait_idle(dev_priv);
297 if (ret) {
298 DRM_ERROR("Failed to idle the blitter, unpin failed!");
299 goto out;
300 }
301
302 WARN_ON(!gt->in_gart);
303
304 gt->in_gart--;
305 if (gt->in_gart == 0 && gt->stolen == 0) {
306 psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
307 (gpu_base + gt->offset), gt->npage, 0, 0);
308 psb_gtt_remove(dev, gt);
309 psb_gtt_detach_pages(gt);
310 }
311
312out:
313 mutex_unlock(&dev_priv->gtt_mutex);
314}
315
316/*
317 * GTT resource allocator - allocate and manage GTT address space
318 */
319
320/**
321 * psb_gtt_alloc_range - allocate GTT address space
322 * @dev: Our DRM device
323 * @len: length (bytes) of address space required
324 * @name: resource name
325 * @backed: resource should be backed by stolen pages
326 * @align: requested alignment
327 *
328 * Ask the kernel core to find us a suitable range of addresses
329 * to use for a GTT mapping.
330 *
331 * Returns a gtt_range structure describing the object, or NULL on
332 * error. On successful return the resource is both allocated and marked
333 * as in use.
334 */
335struct gtt_range *psb_gtt_alloc_range(struct drm_device *dev, int len,
336 const char *name, int backed, u32 align)
337{
338 struct drm_psb_private *dev_priv = dev->dev_private;
339 struct gtt_range *gt;
340 struct resource *r = dev_priv->gtt_mem;
341 int ret;
342 unsigned long start, end;
343
344 if (backed) {
345 /* The start of the GTT is the stolen pages */
346 start = r->start;
347 end = r->start + dev_priv->gtt.stolen_size - 1;
348 } else {
349 /* The rest we will use for GEM backed objects */
350 start = r->start + dev_priv->gtt.stolen_size;
351 end = r->end;
352 }
353
354 gt = kzalloc(sizeof(struct gtt_range), GFP_KERNEL);
355 if (gt == NULL)
356 return NULL;
357 gt->resource.name = name;
358 gt->stolen = backed;
359 gt->in_gart = backed;
360 gt->roll = 0;
361 /* Ensure this is set for non GEM objects */
362 gt->gem.dev = dev;
363 ret = allocate_resource(dev_priv->gtt_mem, >->resource,
364 len, start, end, align, NULL, NULL);
365 if (ret == 0) {
366 gt->offset = gt->resource.start - r->start;
367 return gt;
368 }
369 kfree(gt);
370 return NULL;
371}
372
373/**
374 * psb_gtt_free_range - release GTT address space
375 * @dev: our DRM device
376 * @gt: a mapping created with psb_gtt_alloc_range
377 *
378 * Release a resource that was allocated with psb_gtt_alloc_range. If the
379 * object has been pinned by mmap users we clean this up here currently.
380 */
381void psb_gtt_free_range(struct drm_device *dev, struct gtt_range *gt)
382{
383 /* Undo the mmap pin if we are destroying the object */
384 if (gt->mmapping) {
385 psb_gtt_unpin(gt);
386 gt->mmapping = 0;
387 }
388 WARN_ON(gt->in_gart && !gt->stolen);
389 release_resource(>->resource);
390 kfree(gt);
391}
392
393static void psb_gtt_alloc(struct drm_device *dev)
394{
395 struct drm_psb_private *dev_priv = dev->dev_private;
396 init_rwsem(&dev_priv->gtt.sem);
397}
398
399void psb_gtt_takedown(struct drm_device *dev)
400{
401 struct drm_psb_private *dev_priv = dev->dev_private;
402
403 if (dev_priv->gtt_map) {
404 iounmap(dev_priv->gtt_map);
405 dev_priv->gtt_map = NULL;
406 }
407 if (dev_priv->gtt_initialized) {
408 pci_write_config_word(dev->pdev, PSB_GMCH_CTRL,
409 dev_priv->gmch_ctrl);
410 PSB_WVDC32(dev_priv->pge_ctl, PSB_PGETBL_CTL);
411 (void) PSB_RVDC32(PSB_PGETBL_CTL);
412 }
413 if (dev_priv->vram_addr)
414 iounmap(dev_priv->gtt_map);
415}
416
417int psb_gtt_init(struct drm_device *dev, int resume)
418{
419 struct drm_psb_private *dev_priv = dev->dev_private;
420 unsigned gtt_pages;
421 unsigned long stolen_size, vram_stolen_size;
422 unsigned i, num_pages;
423 unsigned pfn_base;
424 struct psb_gtt *pg;
425
426 int ret = 0;
427 uint32_t pte;
428
429 if (!resume) {
430 mutex_init(&dev_priv->gtt_mutex);
431 mutex_init(&dev_priv->mmap_mutex);
432 psb_gtt_alloc(dev);
433 }
434
435 pg = &dev_priv->gtt;
436
437 /* Enable the GTT */
438 pci_read_config_word(dev->pdev, PSB_GMCH_CTRL, &dev_priv->gmch_ctrl);
439 pci_write_config_word(dev->pdev, PSB_GMCH_CTRL,
440 dev_priv->gmch_ctrl | _PSB_GMCH_ENABLED);
441
442 dev_priv->pge_ctl = PSB_RVDC32(PSB_PGETBL_CTL);
443 PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL);
444 (void) PSB_RVDC32(PSB_PGETBL_CTL);
445
446 /* The root resource we allocate address space from */
447 dev_priv->gtt_initialized = 1;
448
449 pg->gtt_phys_start = dev_priv->pge_ctl & PAGE_MASK;
450
451 /*
452 * The video mmu has a hw bug when accessing 0x0D0000000.
453 * Make gatt start at 0x0e000,0000. This doesn't actually
454 * matter for us but may do if the video acceleration ever
455 * gets opened up.
456 */
457 pg->mmu_gatt_start = 0xE0000000;
458
459 pg->gtt_start = pci_resource_start(dev->pdev, PSB_GTT_RESOURCE);
460 gtt_pages = pci_resource_len(dev->pdev, PSB_GTT_RESOURCE)
461 >> PAGE_SHIFT;
462 /* CDV doesn't report this. In which case the system has 64 gtt pages */
463 if (pg->gtt_start == 0 || gtt_pages == 0) {
464 dev_dbg(dev->dev, "GTT PCI BAR not initialized.\n");
465 gtt_pages = 64;
466 pg->gtt_start = dev_priv->pge_ctl;
467 }
468
469 pg->gatt_start = pci_resource_start(dev->pdev, PSB_GATT_RESOURCE);
470 pg->gatt_pages = pci_resource_len(dev->pdev, PSB_GATT_RESOURCE)
471 >> PAGE_SHIFT;
472 dev_priv->gtt_mem = &dev->pdev->resource[PSB_GATT_RESOURCE];
473
474 if (pg->gatt_pages == 0 || pg->gatt_start == 0) {
475 static struct resource fudge; /* Preferably peppermint */
476 /* This can occur on CDV systems. Fudge it in this case.
477 We really don't care what imaginary space is being allocated
478 at this point */
479 dev_dbg(dev->dev, "GATT PCI BAR not initialized.\n");
480 pg->gatt_start = 0x40000000;
481 pg->gatt_pages = (128 * 1024 * 1024) >> PAGE_SHIFT;
482 /* This is a little confusing but in fact the GTT is providing
483 a view from the GPU into memory and not vice versa. As such
484 this is really allocating space that is not the same as the
485 CPU address space on CDV */
486 fudge.start = 0x40000000;
487 fudge.end = 0x40000000 + 128 * 1024 * 1024 - 1;
488 fudge.name = "fudge";
489 fudge.flags = IORESOURCE_MEM;
490 dev_priv->gtt_mem = &fudge;
491 }
492
493 pci_read_config_dword(dev->pdev, PSB_BSM, &dev_priv->stolen_base);
494 vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base
495 - PAGE_SIZE;
496
497 stolen_size = vram_stolen_size;
498
499 dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n",
500 dev_priv->stolen_base, vram_stolen_size / 1024);
501
502 if (resume && (gtt_pages != pg->gtt_pages) &&
503 (stolen_size != pg->stolen_size)) {
504 dev_err(dev->dev, "GTT resume error.\n");
505 ret = -EINVAL;
506 goto out_err;
507 }
508
509 pg->gtt_pages = gtt_pages;
510 pg->stolen_size = stolen_size;
511 dev_priv->vram_stolen_size = vram_stolen_size;
512
513 /*
514 * Map the GTT and the stolen memory area
515 */
516 if (!resume)
517 dev_priv->gtt_map = ioremap_nocache(pg->gtt_phys_start,
518 gtt_pages << PAGE_SHIFT);
519 if (!dev_priv->gtt_map) {
520 dev_err(dev->dev, "Failure to map gtt.\n");
521 ret = -ENOMEM;
522 goto out_err;
523 }
524
525 if (!resume)
526 dev_priv->vram_addr = ioremap_wc(dev_priv->stolen_base,
527 stolen_size);
528
529 if (!dev_priv->vram_addr) {
530 dev_err(dev->dev, "Failure to map stolen base.\n");
531 ret = -ENOMEM;
532 goto out_err;
533 }
534
535 /*
536 * Insert vram stolen pages into the GTT
537 */
538
539 pfn_base = dev_priv->stolen_base >> PAGE_SHIFT;
540 num_pages = vram_stolen_size >> PAGE_SHIFT;
541 dev_dbg(dev->dev, "Set up %d stolen pages starting at 0x%08x, GTT offset %dK\n",
542 num_pages, pfn_base << PAGE_SHIFT, 0);
543 for (i = 0; i < num_pages; ++i) {
544 pte = psb_gtt_mask_pte(pfn_base + i, PSB_MMU_CACHED_MEMORY);
545 iowrite32(pte, dev_priv->gtt_map + i);
546 }
547
548 /*
549 * Init rest of GTT to the scratch page to avoid accidents or scribbles
550 */
551
552 pfn_base = page_to_pfn(dev_priv->scratch_page);
553 pte = psb_gtt_mask_pte(pfn_base, PSB_MMU_CACHED_MEMORY);
554 for (; i < gtt_pages; ++i)
555 iowrite32(pte, dev_priv->gtt_map + i);
556
557 (void) ioread32(dev_priv->gtt_map + i - 1);
558 return 0;
559
560out_err:
561 psb_gtt_takedown(dev);
562 return ret;
563}
564
565int psb_gtt_restore(struct drm_device *dev)
566{
567 struct drm_psb_private *dev_priv = dev->dev_private;
568 struct resource *r = dev_priv->gtt_mem->child;
569 struct gtt_range *range;
570 unsigned int restored = 0, total = 0, size = 0;
571
572 /* On resume, the gtt_mutex is already initialized */
573 mutex_lock(&dev_priv->gtt_mutex);
574 psb_gtt_init(dev, 1);
575
576 while (r != NULL) {
577 range = container_of(r, struct gtt_range, resource);
578 if (range->pages) {
579 psb_gtt_insert(dev, range, 1);
580 size += range->resource.end - range->resource.start;
581 restored++;
582 }
583 r = r->sibling;
584 total++;
585 }
586 mutex_unlock(&dev_priv->gtt_mutex);
587 DRM_DEBUG_DRIVER("Restored %u of %u gtt ranges (%u KB)", restored,
588 total, (size / 1024));
589
590 return 0;
591}