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1/*
2 * drivers/gpu/drm/omapdrm/omap_gem.c
3 *
4 * Copyright (C) 2011 Texas Instruments
5 * Author: Rob Clark <rob.clark@linaro.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program. If not, see <http://www.gnu.org/licenses/>.
18 */
19
20#include <linux/shmem_fs.h>
21#include <linux/spinlock.h>
22#include <linux/pfn_t.h>
23
24#include <drm/drm_vma_manager.h>
25
26#include "omap_drv.h"
27#include "omap_dmm_tiler.h"
28
29/*
30 * GEM buffer object implementation.
31 */
32
33/* note: we use upper 8 bits of flags for driver-internal flags: */
34#define OMAP_BO_MEM_DMA_API 0x01000000 /* memory allocated with the dma_alloc_* API */
35#define OMAP_BO_MEM_SHMEM 0x02000000 /* memory allocated through shmem backing */
36#define OMAP_BO_MEM_DMABUF 0x08000000 /* memory imported from a dmabuf */
37
38struct omap_gem_object {
39 struct drm_gem_object base;
40
41 struct list_head mm_list;
42
43 uint32_t flags;
44
45 /** width/height for tiled formats (rounded up to slot boundaries) */
46 uint16_t width, height;
47
48 /** roll applied when mapping to DMM */
49 uint32_t roll;
50
51 /**
52 * paddr contains the buffer DMA address. It is valid for
53 *
54 * - buffers allocated through the DMA mapping API (with the
55 * OMAP_BO_MEM_DMA_API flag set)
56 *
57 * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
58 * if they are physically contiguous (when sgt->orig_nents == 1)
59 *
60 * - buffers mapped through the TILER when paddr_cnt is not zero, in
61 * which case the DMA address points to the TILER aperture
62 *
63 * Physically contiguous buffers have their DMA address equal to the
64 * physical address as we don't remap those buffers through the TILER.
65 *
66 * Buffers mapped to the TILER have their DMA address pointing to the
67 * TILER aperture. As TILER mappings are refcounted (through paddr_cnt)
68 * the DMA address must be accessed through omap_get_get_paddr() to
69 * ensure that the mapping won't disappear unexpectedly. References must
70 * be released with omap_gem_put_paddr().
71 */
72 dma_addr_t paddr;
73
74 /**
75 * # of users of paddr
76 */
77 uint32_t paddr_cnt;
78
79 /**
80 * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
81 * is set and the sgt field is valid.
82 */
83 struct sg_table *sgt;
84
85 /**
86 * tiler block used when buffer is remapped in DMM/TILER.
87 */
88 struct tiler_block *block;
89
90 /**
91 * Array of backing pages, if allocated. Note that pages are never
92 * allocated for buffers originally allocated from contiguous memory
93 */
94 struct page **pages;
95
96 /** addresses corresponding to pages in above array */
97 dma_addr_t *addrs;
98
99 /**
100 * Virtual address, if mapped.
101 */
102 void *vaddr;
103
104 /**
105 * sync-object allocated on demand (if needed)
106 *
107 * Per-buffer sync-object for tracking pending and completed hw/dma
108 * read and write operations.
109 */
110 struct {
111 uint32_t write_pending;
112 uint32_t write_complete;
113 uint32_t read_pending;
114 uint32_t read_complete;
115 } *sync;
116};
117
118#define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
119
120/* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
121 * not necessarily pinned in TILER all the time, and (b) when they are
122 * they are not necessarily page aligned, we reserve one or more small
123 * regions in each of the 2d containers to use as a user-GART where we
124 * can create a second page-aligned mapping of parts of the buffer
125 * being accessed from userspace.
126 *
127 * Note that we could optimize slightly when we know that multiple
128 * tiler containers are backed by the same PAT.. but I'll leave that
129 * for later..
130 */
131#define NUM_USERGART_ENTRIES 2
132struct omap_drm_usergart_entry {
133 struct tiler_block *block; /* the reserved tiler block */
134 dma_addr_t paddr;
135 struct drm_gem_object *obj; /* the current pinned obj */
136 pgoff_t obj_pgoff; /* page offset of obj currently
137 mapped in */
138};
139
140struct omap_drm_usergart {
141 struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
142 int height; /* height in rows */
143 int height_shift; /* ilog2(height in rows) */
144 int slot_shift; /* ilog2(width per slot) */
145 int stride_pfn; /* stride in pages */
146 int last; /* index of last used entry */
147};
148
149/* -----------------------------------------------------------------------------
150 * Helpers
151 */
152
153/** get mmap offset */
154static uint64_t mmap_offset(struct drm_gem_object *obj)
155{
156 struct drm_device *dev = obj->dev;
157 int ret;
158 size_t size;
159
160 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
161
162 /* Make it mmapable */
163 size = omap_gem_mmap_size(obj);
164 ret = drm_gem_create_mmap_offset_size(obj, size);
165 if (ret) {
166 dev_err(dev->dev, "could not allocate mmap offset\n");
167 return 0;
168 }
169
170 return drm_vma_node_offset_addr(&obj->vma_node);
171}
172
173static bool is_contiguous(struct omap_gem_object *omap_obj)
174{
175 if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
176 return true;
177
178 if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
179 return true;
180
181 return false;
182}
183
184/* -----------------------------------------------------------------------------
185 * Eviction
186 */
187
188static void evict_entry(struct drm_gem_object *obj,
189 enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
190{
191 struct omap_gem_object *omap_obj = to_omap_bo(obj);
192 struct omap_drm_private *priv = obj->dev->dev_private;
193 int n = priv->usergart[fmt].height;
194 size_t size = PAGE_SIZE * n;
195 loff_t off = mmap_offset(obj) +
196 (entry->obj_pgoff << PAGE_SHIFT);
197 const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
198
199 if (m > 1) {
200 int i;
201 /* if stride > than PAGE_SIZE then sparse mapping: */
202 for (i = n; i > 0; i--) {
203 unmap_mapping_range(obj->dev->anon_inode->i_mapping,
204 off, PAGE_SIZE, 1);
205 off += PAGE_SIZE * m;
206 }
207 } else {
208 unmap_mapping_range(obj->dev->anon_inode->i_mapping,
209 off, size, 1);
210 }
211
212 entry->obj = NULL;
213}
214
215/* Evict a buffer from usergart, if it is mapped there */
216static void evict(struct drm_gem_object *obj)
217{
218 struct omap_gem_object *omap_obj = to_omap_bo(obj);
219 struct omap_drm_private *priv = obj->dev->dev_private;
220
221 if (omap_obj->flags & OMAP_BO_TILED) {
222 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
223 int i;
224
225 for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
226 struct omap_drm_usergart_entry *entry =
227 &priv->usergart[fmt].entry[i];
228
229 if (entry->obj == obj)
230 evict_entry(obj, fmt, entry);
231 }
232 }
233}
234
235/* -----------------------------------------------------------------------------
236 * Page Management
237 */
238
239/** ensure backing pages are allocated */
240static int omap_gem_attach_pages(struct drm_gem_object *obj)
241{
242 struct drm_device *dev = obj->dev;
243 struct omap_gem_object *omap_obj = to_omap_bo(obj);
244 struct page **pages;
245 int npages = obj->size >> PAGE_SHIFT;
246 int i, ret;
247 dma_addr_t *addrs;
248
249 WARN_ON(omap_obj->pages);
250
251 pages = drm_gem_get_pages(obj);
252 if (IS_ERR(pages)) {
253 dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
254 return PTR_ERR(pages);
255 }
256
257 /* for non-cached buffers, ensure the new pages are clean because
258 * DSS, GPU, etc. are not cache coherent:
259 */
260 if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
261 addrs = kmalloc(npages * sizeof(*addrs), GFP_KERNEL);
262 if (!addrs) {
263 ret = -ENOMEM;
264 goto free_pages;
265 }
266
267 for (i = 0; i < npages; i++) {
268 addrs[i] = dma_map_page(dev->dev, pages[i],
269 0, PAGE_SIZE, DMA_BIDIRECTIONAL);
270
271 if (dma_mapping_error(dev->dev, addrs[i])) {
272 dev_warn(dev->dev,
273 "%s: failed to map page\n", __func__);
274
275 for (i = i - 1; i >= 0; --i) {
276 dma_unmap_page(dev->dev, addrs[i],
277 PAGE_SIZE, DMA_BIDIRECTIONAL);
278 }
279
280 ret = -ENOMEM;
281 goto free_addrs;
282 }
283 }
284 } else {
285 addrs = kzalloc(npages * sizeof(*addrs), GFP_KERNEL);
286 if (!addrs) {
287 ret = -ENOMEM;
288 goto free_pages;
289 }
290 }
291
292 omap_obj->addrs = addrs;
293 omap_obj->pages = pages;
294
295 return 0;
296
297free_addrs:
298 kfree(addrs);
299free_pages:
300 drm_gem_put_pages(obj, pages, true, false);
301
302 return ret;
303}
304
305/* acquire pages when needed (for example, for DMA where physically
306 * contiguous buffer is not required
307 */
308static int get_pages(struct drm_gem_object *obj, struct page ***pages)
309{
310 struct omap_gem_object *omap_obj = to_omap_bo(obj);
311 int ret = 0;
312
313 if ((omap_obj->flags & OMAP_BO_MEM_SHMEM) && !omap_obj->pages) {
314 ret = omap_gem_attach_pages(obj);
315 if (ret) {
316 dev_err(obj->dev->dev, "could not attach pages\n");
317 return ret;
318 }
319 }
320
321 /* TODO: even phys-contig.. we should have a list of pages? */
322 *pages = omap_obj->pages;
323
324 return 0;
325}
326
327/** release backing pages */
328static void omap_gem_detach_pages(struct drm_gem_object *obj)
329{
330 struct omap_gem_object *omap_obj = to_omap_bo(obj);
331
332 /* for non-cached buffers, ensure the new pages are clean because
333 * DSS, GPU, etc. are not cache coherent:
334 */
335 if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
336 int i, npages = obj->size >> PAGE_SHIFT;
337 for (i = 0; i < npages; i++) {
338 dma_unmap_page(obj->dev->dev, omap_obj->addrs[i],
339 PAGE_SIZE, DMA_BIDIRECTIONAL);
340 }
341 }
342
343 kfree(omap_obj->addrs);
344 omap_obj->addrs = NULL;
345
346 drm_gem_put_pages(obj, omap_obj->pages, true, false);
347 omap_obj->pages = NULL;
348}
349
350/* get buffer flags */
351uint32_t omap_gem_flags(struct drm_gem_object *obj)
352{
353 return to_omap_bo(obj)->flags;
354}
355
356uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj)
357{
358 uint64_t offset;
359 mutex_lock(&obj->dev->struct_mutex);
360 offset = mmap_offset(obj);
361 mutex_unlock(&obj->dev->struct_mutex);
362 return offset;
363}
364
365/** get mmap size */
366size_t omap_gem_mmap_size(struct drm_gem_object *obj)
367{
368 struct omap_gem_object *omap_obj = to_omap_bo(obj);
369 size_t size = obj->size;
370
371 if (omap_obj->flags & OMAP_BO_TILED) {
372 /* for tiled buffers, the virtual size has stride rounded up
373 * to 4kb.. (to hide the fact that row n+1 might start 16kb or
374 * 32kb later!). But we don't back the entire buffer with
375 * pages, only the valid picture part.. so need to adjust for
376 * this in the size used to mmap and generate mmap offset
377 */
378 size = tiler_vsize(gem2fmt(omap_obj->flags),
379 omap_obj->width, omap_obj->height);
380 }
381
382 return size;
383}
384
385/* get tiled size, returns -EINVAL if not tiled buffer */
386int omap_gem_tiled_size(struct drm_gem_object *obj, uint16_t *w, uint16_t *h)
387{
388 struct omap_gem_object *omap_obj = to_omap_bo(obj);
389 if (omap_obj->flags & OMAP_BO_TILED) {
390 *w = omap_obj->width;
391 *h = omap_obj->height;
392 return 0;
393 }
394 return -EINVAL;
395}
396
397/* -----------------------------------------------------------------------------
398 * Fault Handling
399 */
400
401/* Normal handling for the case of faulting in non-tiled buffers */
402static int fault_1d(struct drm_gem_object *obj,
403 struct vm_area_struct *vma, struct vm_fault *vmf)
404{
405 struct omap_gem_object *omap_obj = to_omap_bo(obj);
406 unsigned long pfn;
407 pgoff_t pgoff;
408
409 /* We don't use vmf->pgoff since that has the fake offset: */
410 pgoff = ((unsigned long)vmf->virtual_address -
411 vma->vm_start) >> PAGE_SHIFT;
412
413 if (omap_obj->pages) {
414 omap_gem_cpu_sync(obj, pgoff);
415 pfn = page_to_pfn(omap_obj->pages[pgoff]);
416 } else {
417 BUG_ON(!is_contiguous(omap_obj));
418 pfn = (omap_obj->paddr >> PAGE_SHIFT) + pgoff;
419 }
420
421 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
422 pfn, pfn << PAGE_SHIFT);
423
424 return vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
425 __pfn_to_pfn_t(pfn, PFN_DEV));
426}
427
428/* Special handling for the case of faulting in 2d tiled buffers */
429static int fault_2d(struct drm_gem_object *obj,
430 struct vm_area_struct *vma, struct vm_fault *vmf)
431{
432 struct omap_gem_object *omap_obj = to_omap_bo(obj);
433 struct omap_drm_private *priv = obj->dev->dev_private;
434 struct omap_drm_usergart_entry *entry;
435 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
436 struct page *pages[64]; /* XXX is this too much to have on stack? */
437 unsigned long pfn;
438 pgoff_t pgoff, base_pgoff;
439 void __user *vaddr;
440 int i, ret, slots;
441
442 /*
443 * Note the height of the slot is also equal to the number of pages
444 * that need to be mapped in to fill 4kb wide CPU page. If the slot
445 * height is 64, then 64 pages fill a 4kb wide by 64 row region.
446 */
447 const int n = priv->usergart[fmt].height;
448 const int n_shift = priv->usergart[fmt].height_shift;
449
450 /*
451 * If buffer width in bytes > PAGE_SIZE then the virtual stride is
452 * rounded up to next multiple of PAGE_SIZE.. this need to be taken
453 * into account in some of the math, so figure out virtual stride
454 * in pages
455 */
456 const int m = 1 + ((omap_obj->width << fmt) / PAGE_SIZE);
457
458 /* We don't use vmf->pgoff since that has the fake offset: */
459 pgoff = ((unsigned long)vmf->virtual_address -
460 vma->vm_start) >> PAGE_SHIFT;
461
462 /*
463 * Actual address we start mapping at is rounded down to previous slot
464 * boundary in the y direction:
465 */
466 base_pgoff = round_down(pgoff, m << n_shift);
467
468 /* figure out buffer width in slots */
469 slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
470
471 vaddr = vmf->virtual_address - ((pgoff - base_pgoff) << PAGE_SHIFT);
472
473 entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
474
475 /* evict previous buffer using this usergart entry, if any: */
476 if (entry->obj)
477 evict_entry(entry->obj, fmt, entry);
478
479 entry->obj = obj;
480 entry->obj_pgoff = base_pgoff;
481
482 /* now convert base_pgoff to phys offset from virt offset: */
483 base_pgoff = (base_pgoff >> n_shift) * slots;
484
485 /* for wider-than 4k.. figure out which part of the slot-row we want: */
486 if (m > 1) {
487 int off = pgoff % m;
488 entry->obj_pgoff += off;
489 base_pgoff /= m;
490 slots = min(slots - (off << n_shift), n);
491 base_pgoff += off << n_shift;
492 vaddr += off << PAGE_SHIFT;
493 }
494
495 /*
496 * Map in pages. Beyond the valid pixel part of the buffer, we set
497 * pages[i] to NULL to get a dummy page mapped in.. if someone
498 * reads/writes it they will get random/undefined content, but at
499 * least it won't be corrupting whatever other random page used to
500 * be mapped in, or other undefined behavior.
501 */
502 memcpy(pages, &omap_obj->pages[base_pgoff],
503 sizeof(struct page *) * slots);
504 memset(pages + slots, 0,
505 sizeof(struct page *) * (n - slots));
506
507 ret = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
508 if (ret) {
509 dev_err(obj->dev->dev, "failed to pin: %d\n", ret);
510 return ret;
511 }
512
513 pfn = entry->paddr >> PAGE_SHIFT;
514
515 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
516 pfn, pfn << PAGE_SHIFT);
517
518 for (i = n; i > 0; i--) {
519 vm_insert_mixed(vma, (unsigned long)vaddr,
520 __pfn_to_pfn_t(pfn, PFN_DEV));
521 pfn += priv->usergart[fmt].stride_pfn;
522 vaddr += PAGE_SIZE * m;
523 }
524
525 /* simple round-robin: */
526 priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
527 % NUM_USERGART_ENTRIES;
528
529 return 0;
530}
531
532/**
533 * omap_gem_fault - pagefault handler for GEM objects
534 * @vma: the VMA of the GEM object
535 * @vmf: fault detail
536 *
537 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
538 * does most of the work for us including the actual map/unmap calls
539 * but we need to do the actual page work.
540 *
541 * The VMA was set up by GEM. In doing so it also ensured that the
542 * vma->vm_private_data points to the GEM object that is backing this
543 * mapping.
544 */
545int omap_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
546{
547 struct drm_gem_object *obj = vma->vm_private_data;
548 struct omap_gem_object *omap_obj = to_omap_bo(obj);
549 struct drm_device *dev = obj->dev;
550 struct page **pages;
551 int ret;
552
553 /* Make sure we don't parallel update on a fault, nor move or remove
554 * something from beneath our feet
555 */
556 mutex_lock(&dev->struct_mutex);
557
558 /* if a shmem backed object, make sure we have pages attached now */
559 ret = get_pages(obj, &pages);
560 if (ret)
561 goto fail;
562
563 /* where should we do corresponding put_pages().. we are mapping
564 * the original page, rather than thru a GART, so we can't rely
565 * on eviction to trigger this. But munmap() or all mappings should
566 * probably trigger put_pages()?
567 */
568
569 if (omap_obj->flags & OMAP_BO_TILED)
570 ret = fault_2d(obj, vma, vmf);
571 else
572 ret = fault_1d(obj, vma, vmf);
573
574
575fail:
576 mutex_unlock(&dev->struct_mutex);
577 switch (ret) {
578 case 0:
579 case -ERESTARTSYS:
580 case -EINTR:
581 case -EBUSY:
582 /*
583 * EBUSY is ok: this just means that another thread
584 * already did the job.
585 */
586 return VM_FAULT_NOPAGE;
587 case -ENOMEM:
588 return VM_FAULT_OOM;
589 default:
590 return VM_FAULT_SIGBUS;
591 }
592}
593
594/** We override mainly to fix up some of the vm mapping flags.. */
595int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
596{
597 int ret;
598
599 ret = drm_gem_mmap(filp, vma);
600 if (ret) {
601 DBG("mmap failed: %d", ret);
602 return ret;
603 }
604
605 return omap_gem_mmap_obj(vma->vm_private_data, vma);
606}
607
608int omap_gem_mmap_obj(struct drm_gem_object *obj,
609 struct vm_area_struct *vma)
610{
611 struct omap_gem_object *omap_obj = to_omap_bo(obj);
612
613 vma->vm_flags &= ~VM_PFNMAP;
614 vma->vm_flags |= VM_MIXEDMAP;
615
616 if (omap_obj->flags & OMAP_BO_WC) {
617 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
618 } else if (omap_obj->flags & OMAP_BO_UNCACHED) {
619 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
620 } else {
621 /*
622 * We do have some private objects, at least for scanout buffers
623 * on hardware without DMM/TILER. But these are allocated write-
624 * combine
625 */
626 if (WARN_ON(!obj->filp))
627 return -EINVAL;
628
629 /*
630 * Shunt off cached objs to shmem file so they have their own
631 * address_space (so unmap_mapping_range does what we want,
632 * in particular in the case of mmap'd dmabufs)
633 */
634 fput(vma->vm_file);
635 vma->vm_pgoff = 0;
636 vma->vm_file = get_file(obj->filp);
637
638 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
639 }
640
641 return 0;
642}
643
644/* -----------------------------------------------------------------------------
645 * Dumb Buffers
646 */
647
648/**
649 * omap_gem_dumb_create - create a dumb buffer
650 * @drm_file: our client file
651 * @dev: our device
652 * @args: the requested arguments copied from userspace
653 *
654 * Allocate a buffer suitable for use for a frame buffer of the
655 * form described by user space. Give userspace a handle by which
656 * to reference it.
657 */
658int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
659 struct drm_mode_create_dumb *args)
660{
661 union omap_gem_size gsize;
662
663 args->pitch = align_pitch(0, args->width, args->bpp);
664 args->size = PAGE_ALIGN(args->pitch * args->height);
665
666 gsize = (union omap_gem_size){
667 .bytes = args->size,
668 };
669
670 return omap_gem_new_handle(dev, file, gsize,
671 OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
672}
673
674/**
675 * omap_gem_dumb_map - buffer mapping for dumb interface
676 * @file: our drm client file
677 * @dev: drm device
678 * @handle: GEM handle to the object (from dumb_create)
679 *
680 * Do the necessary setup to allow the mapping of the frame buffer
681 * into user memory. We don't have to do much here at the moment.
682 */
683int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
684 uint32_t handle, uint64_t *offset)
685{
686 struct drm_gem_object *obj;
687 int ret = 0;
688
689 /* GEM does all our handle to object mapping */
690 obj = drm_gem_object_lookup(dev, file, handle);
691 if (obj == NULL) {
692 ret = -ENOENT;
693 goto fail;
694 }
695
696 *offset = omap_gem_mmap_offset(obj);
697
698 drm_gem_object_unreference_unlocked(obj);
699
700fail:
701 return ret;
702}
703
704#ifdef CONFIG_DRM_FBDEV_EMULATION
705/* Set scrolling position. This allows us to implement fast scrolling
706 * for console.
707 *
708 * Call only from non-atomic contexts.
709 */
710int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll)
711{
712 struct omap_gem_object *omap_obj = to_omap_bo(obj);
713 uint32_t npages = obj->size >> PAGE_SHIFT;
714 int ret = 0;
715
716 if (roll > npages) {
717 dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
718 return -EINVAL;
719 }
720
721 omap_obj->roll = roll;
722
723 mutex_lock(&obj->dev->struct_mutex);
724
725 /* if we aren't mapped yet, we don't need to do anything */
726 if (omap_obj->block) {
727 struct page **pages;
728 ret = get_pages(obj, &pages);
729 if (ret)
730 goto fail;
731 ret = tiler_pin(omap_obj->block, pages, npages, roll, true);
732 if (ret)
733 dev_err(obj->dev->dev, "could not repin: %d\n", ret);
734 }
735
736fail:
737 mutex_unlock(&obj->dev->struct_mutex);
738
739 return ret;
740}
741#endif
742
743/* -----------------------------------------------------------------------------
744 * Memory Management & DMA Sync
745 */
746
747/**
748 * shmem buffers that are mapped cached can simulate coherency via using
749 * page faulting to keep track of dirty pages
750 */
751static inline bool is_cached_coherent(struct drm_gem_object *obj)
752{
753 struct omap_gem_object *omap_obj = to_omap_bo(obj);
754
755 return (omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
756 ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED);
757}
758
759/* Sync the buffer for CPU access.. note pages should already be
760 * attached, ie. omap_gem_get_pages()
761 */
762void omap_gem_cpu_sync(struct drm_gem_object *obj, int pgoff)
763{
764 struct drm_device *dev = obj->dev;
765 struct omap_gem_object *omap_obj = to_omap_bo(obj);
766
767 if (is_cached_coherent(obj) && omap_obj->addrs[pgoff]) {
768 dma_unmap_page(dev->dev, omap_obj->addrs[pgoff],
769 PAGE_SIZE, DMA_BIDIRECTIONAL);
770 omap_obj->addrs[pgoff] = 0;
771 }
772}
773
774/* sync the buffer for DMA access */
775void omap_gem_dma_sync(struct drm_gem_object *obj,
776 enum dma_data_direction dir)
777{
778 struct drm_device *dev = obj->dev;
779 struct omap_gem_object *omap_obj = to_omap_bo(obj);
780
781 if (is_cached_coherent(obj)) {
782 int i, npages = obj->size >> PAGE_SHIFT;
783 struct page **pages = omap_obj->pages;
784 bool dirty = false;
785
786 for (i = 0; i < npages; i++) {
787 if (!omap_obj->addrs[i]) {
788 dma_addr_t addr;
789
790 addr = dma_map_page(dev->dev, pages[i], 0,
791 PAGE_SIZE, DMA_BIDIRECTIONAL);
792
793 if (dma_mapping_error(dev->dev, addr)) {
794 dev_warn(dev->dev,
795 "%s: failed to map page\n",
796 __func__);
797 break;
798 }
799
800 dirty = true;
801 omap_obj->addrs[i] = addr;
802 }
803 }
804
805 if (dirty) {
806 unmap_mapping_range(obj->filp->f_mapping, 0,
807 omap_gem_mmap_size(obj), 1);
808 }
809 }
810}
811
812/* Get physical address for DMA.. if 'remap' is true, and the buffer is not
813 * already contiguous, remap it to pin in physically contiguous memory.. (ie.
814 * map in TILER)
815 */
816int omap_gem_get_paddr(struct drm_gem_object *obj,
817 dma_addr_t *paddr, bool remap)
818{
819 struct omap_drm_private *priv = obj->dev->dev_private;
820 struct omap_gem_object *omap_obj = to_omap_bo(obj);
821 int ret = 0;
822
823 mutex_lock(&obj->dev->struct_mutex);
824
825 if (!is_contiguous(omap_obj) && remap && priv->has_dmm) {
826 if (omap_obj->paddr_cnt == 0) {
827 struct page **pages;
828 uint32_t npages = obj->size >> PAGE_SHIFT;
829 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
830 struct tiler_block *block;
831
832 BUG_ON(omap_obj->block);
833
834 ret = get_pages(obj, &pages);
835 if (ret)
836 goto fail;
837
838 if (omap_obj->flags & OMAP_BO_TILED) {
839 block = tiler_reserve_2d(fmt,
840 omap_obj->width,
841 omap_obj->height, 0);
842 } else {
843 block = tiler_reserve_1d(obj->size);
844 }
845
846 if (IS_ERR(block)) {
847 ret = PTR_ERR(block);
848 dev_err(obj->dev->dev,
849 "could not remap: %d (%d)\n", ret, fmt);
850 goto fail;
851 }
852
853 /* TODO: enable async refill.. */
854 ret = tiler_pin(block, pages, npages,
855 omap_obj->roll, true);
856 if (ret) {
857 tiler_release(block);
858 dev_err(obj->dev->dev,
859 "could not pin: %d\n", ret);
860 goto fail;
861 }
862
863 omap_obj->paddr = tiler_ssptr(block);
864 omap_obj->block = block;
865
866 DBG("got paddr: %pad", &omap_obj->paddr);
867 }
868
869 omap_obj->paddr_cnt++;
870
871 *paddr = omap_obj->paddr;
872 } else if (is_contiguous(omap_obj)) {
873 *paddr = omap_obj->paddr;
874 } else {
875 ret = -EINVAL;
876 goto fail;
877 }
878
879fail:
880 mutex_unlock(&obj->dev->struct_mutex);
881
882 return ret;
883}
884
885/* Release physical address, when DMA is no longer being performed.. this
886 * could potentially unpin and unmap buffers from TILER
887 */
888void omap_gem_put_paddr(struct drm_gem_object *obj)
889{
890 struct omap_gem_object *omap_obj = to_omap_bo(obj);
891 int ret;
892
893 mutex_lock(&obj->dev->struct_mutex);
894 if (omap_obj->paddr_cnt > 0) {
895 omap_obj->paddr_cnt--;
896 if (omap_obj->paddr_cnt == 0) {
897 ret = tiler_unpin(omap_obj->block);
898 if (ret) {
899 dev_err(obj->dev->dev,
900 "could not unpin pages: %d\n", ret);
901 }
902 ret = tiler_release(omap_obj->block);
903 if (ret) {
904 dev_err(obj->dev->dev,
905 "could not release unmap: %d\n", ret);
906 }
907 omap_obj->paddr = 0;
908 omap_obj->block = NULL;
909 }
910 }
911
912 mutex_unlock(&obj->dev->struct_mutex);
913}
914
915/* Get rotated scanout address (only valid if already pinned), at the
916 * specified orientation and x,y offset from top-left corner of buffer
917 * (only valid for tiled 2d buffers)
918 */
919int omap_gem_rotated_paddr(struct drm_gem_object *obj, uint32_t orient,
920 int x, int y, dma_addr_t *paddr)
921{
922 struct omap_gem_object *omap_obj = to_omap_bo(obj);
923 int ret = -EINVAL;
924
925 mutex_lock(&obj->dev->struct_mutex);
926 if ((omap_obj->paddr_cnt > 0) && omap_obj->block &&
927 (omap_obj->flags & OMAP_BO_TILED)) {
928 *paddr = tiler_tsptr(omap_obj->block, orient, x, y);
929 ret = 0;
930 }
931 mutex_unlock(&obj->dev->struct_mutex);
932 return ret;
933}
934
935/* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
936int omap_gem_tiled_stride(struct drm_gem_object *obj, uint32_t orient)
937{
938 struct omap_gem_object *omap_obj = to_omap_bo(obj);
939 int ret = -EINVAL;
940 if (omap_obj->flags & OMAP_BO_TILED)
941 ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
942 return ret;
943}
944
945/* if !remap, and we don't have pages backing, then fail, rather than
946 * increasing the pin count (which we don't really do yet anyways,
947 * because we don't support swapping pages back out). And 'remap'
948 * might not be quite the right name, but I wanted to keep it working
949 * similarly to omap_gem_get_paddr(). Note though that mutex is not
950 * aquired if !remap (because this can be called in atomic ctxt),
951 * but probably omap_gem_get_paddr() should be changed to work in the
952 * same way. If !remap, a matching omap_gem_put_pages() call is not
953 * required (and should not be made).
954 */
955int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
956 bool remap)
957{
958 int ret;
959 if (!remap) {
960 struct omap_gem_object *omap_obj = to_omap_bo(obj);
961 if (!omap_obj->pages)
962 return -ENOMEM;
963 *pages = omap_obj->pages;
964 return 0;
965 }
966 mutex_lock(&obj->dev->struct_mutex);
967 ret = get_pages(obj, pages);
968 mutex_unlock(&obj->dev->struct_mutex);
969 return ret;
970}
971
972/* release pages when DMA no longer being performed */
973int omap_gem_put_pages(struct drm_gem_object *obj)
974{
975 /* do something here if we dynamically attach/detach pages.. at
976 * least they would no longer need to be pinned if everyone has
977 * released the pages..
978 */
979 return 0;
980}
981
982#ifdef CONFIG_DRM_FBDEV_EMULATION
983/* Get kernel virtual address for CPU access.. this more or less only
984 * exists for omap_fbdev. This should be called with struct_mutex
985 * held.
986 */
987void *omap_gem_vaddr(struct drm_gem_object *obj)
988{
989 struct omap_gem_object *omap_obj = to_omap_bo(obj);
990 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
991 if (!omap_obj->vaddr) {
992 struct page **pages;
993 int ret = get_pages(obj, &pages);
994 if (ret)
995 return ERR_PTR(ret);
996 omap_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
997 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
998 }
999 return omap_obj->vaddr;
1000}
1001#endif
1002
1003/* -----------------------------------------------------------------------------
1004 * Power Management
1005 */
1006
1007#ifdef CONFIG_PM
1008/* re-pin objects in DMM in resume path: */
1009int omap_gem_resume(struct device *dev)
1010{
1011 struct drm_device *drm_dev = dev_get_drvdata(dev);
1012 struct omap_drm_private *priv = drm_dev->dev_private;
1013 struct omap_gem_object *omap_obj;
1014 int ret = 0;
1015
1016 list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
1017 if (omap_obj->block) {
1018 struct drm_gem_object *obj = &omap_obj->base;
1019 uint32_t npages = obj->size >> PAGE_SHIFT;
1020 WARN_ON(!omap_obj->pages); /* this can't happen */
1021 ret = tiler_pin(omap_obj->block,
1022 omap_obj->pages, npages,
1023 omap_obj->roll, true);
1024 if (ret) {
1025 dev_err(dev, "could not repin: %d\n", ret);
1026 return ret;
1027 }
1028 }
1029 }
1030
1031 return 0;
1032}
1033#endif
1034
1035/* -----------------------------------------------------------------------------
1036 * DebugFS
1037 */
1038
1039#ifdef CONFIG_DEBUG_FS
1040void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
1041{
1042 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1043 uint64_t off;
1044
1045 off = drm_vma_node_start(&obj->vma_node);
1046
1047 seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
1048 omap_obj->flags, obj->name, obj->refcount.refcount.counter,
1049 off, &omap_obj->paddr, omap_obj->paddr_cnt,
1050 omap_obj->vaddr, omap_obj->roll);
1051
1052 if (omap_obj->flags & OMAP_BO_TILED) {
1053 seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
1054 if (omap_obj->block) {
1055 struct tcm_area *area = &omap_obj->block->area;
1056 seq_printf(m, " (%dx%d, %dx%d)",
1057 area->p0.x, area->p0.y,
1058 area->p1.x, area->p1.y);
1059 }
1060 } else {
1061 seq_printf(m, " %d", obj->size);
1062 }
1063
1064 seq_printf(m, "\n");
1065}
1066
1067void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
1068{
1069 struct omap_gem_object *omap_obj;
1070 int count = 0;
1071 size_t size = 0;
1072
1073 list_for_each_entry(omap_obj, list, mm_list) {
1074 struct drm_gem_object *obj = &omap_obj->base;
1075 seq_printf(m, " ");
1076 omap_gem_describe(obj, m);
1077 count++;
1078 size += obj->size;
1079 }
1080
1081 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
1082}
1083#endif
1084
1085/* -----------------------------------------------------------------------------
1086 * Buffer Synchronization
1087 */
1088
1089static DEFINE_SPINLOCK(sync_lock);
1090
1091struct omap_gem_sync_waiter {
1092 struct list_head list;
1093 struct omap_gem_object *omap_obj;
1094 enum omap_gem_op op;
1095 uint32_t read_target, write_target;
1096 /* notify called w/ sync_lock held */
1097 void (*notify)(void *arg);
1098 void *arg;
1099};
1100
1101/* list of omap_gem_sync_waiter.. the notify fxn gets called back when
1102 * the read and/or write target count is achieved which can call a user
1103 * callback (ex. to kick 3d and/or 2d), wakeup blocked task (prep for
1104 * cpu access), etc.
1105 */
1106static LIST_HEAD(waiters);
1107
1108static inline bool is_waiting(struct omap_gem_sync_waiter *waiter)
1109{
1110 struct omap_gem_object *omap_obj = waiter->omap_obj;
1111 if ((waiter->op & OMAP_GEM_READ) &&
1112 (omap_obj->sync->write_complete < waiter->write_target))
1113 return true;
1114 if ((waiter->op & OMAP_GEM_WRITE) &&
1115 (omap_obj->sync->read_complete < waiter->read_target))
1116 return true;
1117 return false;
1118}
1119
1120/* macro for sync debug.. */
1121#define SYNCDBG 0
1122#define SYNC(fmt, ...) do { if (SYNCDBG) \
1123 printk(KERN_ERR "%s:%d: "fmt"\n", \
1124 __func__, __LINE__, ##__VA_ARGS__); \
1125 } while (0)
1126
1127
1128static void sync_op_update(void)
1129{
1130 struct omap_gem_sync_waiter *waiter, *n;
1131 list_for_each_entry_safe(waiter, n, &waiters, list) {
1132 if (!is_waiting(waiter)) {
1133 list_del(&waiter->list);
1134 SYNC("notify: %p", waiter);
1135 waiter->notify(waiter->arg);
1136 kfree(waiter);
1137 }
1138 }
1139}
1140
1141static inline int sync_op(struct drm_gem_object *obj,
1142 enum omap_gem_op op, bool start)
1143{
1144 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1145 int ret = 0;
1146
1147 spin_lock(&sync_lock);
1148
1149 if (!omap_obj->sync) {
1150 omap_obj->sync = kzalloc(sizeof(*omap_obj->sync), GFP_ATOMIC);
1151 if (!omap_obj->sync) {
1152 ret = -ENOMEM;
1153 goto unlock;
1154 }
1155 }
1156
1157 if (start) {
1158 if (op & OMAP_GEM_READ)
1159 omap_obj->sync->read_pending++;
1160 if (op & OMAP_GEM_WRITE)
1161 omap_obj->sync->write_pending++;
1162 } else {
1163 if (op & OMAP_GEM_READ)
1164 omap_obj->sync->read_complete++;
1165 if (op & OMAP_GEM_WRITE)
1166 omap_obj->sync->write_complete++;
1167 sync_op_update();
1168 }
1169
1170unlock:
1171 spin_unlock(&sync_lock);
1172
1173 return ret;
1174}
1175
1176/* mark the start of read and/or write operation */
1177int omap_gem_op_start(struct drm_gem_object *obj, enum omap_gem_op op)
1178{
1179 return sync_op(obj, op, true);
1180}
1181
1182int omap_gem_op_finish(struct drm_gem_object *obj, enum omap_gem_op op)
1183{
1184 return sync_op(obj, op, false);
1185}
1186
1187static DECLARE_WAIT_QUEUE_HEAD(sync_event);
1188
1189static void sync_notify(void *arg)
1190{
1191 struct task_struct **waiter_task = arg;
1192 *waiter_task = NULL;
1193 wake_up_all(&sync_event);
1194}
1195
1196int omap_gem_op_sync(struct drm_gem_object *obj, enum omap_gem_op op)
1197{
1198 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1199 int ret = 0;
1200 if (omap_obj->sync) {
1201 struct task_struct *waiter_task = current;
1202 struct omap_gem_sync_waiter *waiter =
1203 kzalloc(sizeof(*waiter), GFP_KERNEL);
1204
1205 if (!waiter)
1206 return -ENOMEM;
1207
1208 waiter->omap_obj = omap_obj;
1209 waiter->op = op;
1210 waiter->read_target = omap_obj->sync->read_pending;
1211 waiter->write_target = omap_obj->sync->write_pending;
1212 waiter->notify = sync_notify;
1213 waiter->arg = &waiter_task;
1214
1215 spin_lock(&sync_lock);
1216 if (is_waiting(waiter)) {
1217 SYNC("waited: %p", waiter);
1218 list_add_tail(&waiter->list, &waiters);
1219 spin_unlock(&sync_lock);
1220 ret = wait_event_interruptible(sync_event,
1221 (waiter_task == NULL));
1222 spin_lock(&sync_lock);
1223 if (waiter_task) {
1224 SYNC("interrupted: %p", waiter);
1225 /* we were interrupted */
1226 list_del(&waiter->list);
1227 waiter_task = NULL;
1228 } else {
1229 /* freed in sync_op_update() */
1230 waiter = NULL;
1231 }
1232 }
1233 spin_unlock(&sync_lock);
1234 kfree(waiter);
1235 }
1236 return ret;
1237}
1238
1239/* call fxn(arg), either synchronously or asynchronously if the op
1240 * is currently blocked.. fxn() can be called from any context
1241 *
1242 * (TODO for now fxn is called back from whichever context calls
1243 * omap_gem_op_finish().. but this could be better defined later
1244 * if needed)
1245 *
1246 * TODO more code in common w/ _sync()..
1247 */
1248int omap_gem_op_async(struct drm_gem_object *obj, enum omap_gem_op op,
1249 void (*fxn)(void *arg), void *arg)
1250{
1251 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1252 if (omap_obj->sync) {
1253 struct omap_gem_sync_waiter *waiter =
1254 kzalloc(sizeof(*waiter), GFP_ATOMIC);
1255
1256 if (!waiter)
1257 return -ENOMEM;
1258
1259 waiter->omap_obj = omap_obj;
1260 waiter->op = op;
1261 waiter->read_target = omap_obj->sync->read_pending;
1262 waiter->write_target = omap_obj->sync->write_pending;
1263 waiter->notify = fxn;
1264 waiter->arg = arg;
1265
1266 spin_lock(&sync_lock);
1267 if (is_waiting(waiter)) {
1268 SYNC("waited: %p", waiter);
1269 list_add_tail(&waiter->list, &waiters);
1270 spin_unlock(&sync_lock);
1271 return 0;
1272 }
1273
1274 spin_unlock(&sync_lock);
1275
1276 kfree(waiter);
1277 }
1278
1279 /* no waiting.. */
1280 fxn(arg);
1281
1282 return 0;
1283}
1284
1285/* -----------------------------------------------------------------------------
1286 * Constructor & Destructor
1287 */
1288
1289void omap_gem_free_object(struct drm_gem_object *obj)
1290{
1291 struct drm_device *dev = obj->dev;
1292 struct omap_drm_private *priv = dev->dev_private;
1293 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1294
1295 evict(obj);
1296
1297 WARN_ON(!mutex_is_locked(&dev->struct_mutex));
1298
1299 spin_lock(&priv->list_lock);
1300 list_del(&omap_obj->mm_list);
1301 spin_unlock(&priv->list_lock);
1302
1303 /* this means the object is still pinned.. which really should
1304 * not happen. I think..
1305 */
1306 WARN_ON(omap_obj->paddr_cnt > 0);
1307
1308 if (omap_obj->pages) {
1309 if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
1310 kfree(omap_obj->pages);
1311 else
1312 omap_gem_detach_pages(obj);
1313 }
1314
1315 if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
1316 dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
1317 omap_obj->paddr);
1318 } else if (omap_obj->vaddr) {
1319 vunmap(omap_obj->vaddr);
1320 } else if (obj->import_attach) {
1321 drm_prime_gem_destroy(obj, omap_obj->sgt);
1322 }
1323
1324 kfree(omap_obj->sync);
1325
1326 drm_gem_object_release(obj);
1327
1328 kfree(omap_obj);
1329}
1330
1331/* GEM buffer object constructor */
1332struct drm_gem_object *omap_gem_new(struct drm_device *dev,
1333 union omap_gem_size gsize, uint32_t flags)
1334{
1335 struct omap_drm_private *priv = dev->dev_private;
1336 struct omap_gem_object *omap_obj;
1337 struct drm_gem_object *obj;
1338 struct address_space *mapping;
1339 size_t size;
1340 int ret;
1341
1342 /* Validate the flags and compute the memory and cache flags. */
1343 if (flags & OMAP_BO_TILED) {
1344 if (!priv->usergart) {
1345 dev_err(dev->dev, "Tiled buffers require DMM\n");
1346 return NULL;
1347 }
1348
1349 /*
1350 * Tiled buffers are always shmem paged backed. When they are
1351 * scanned out, they are remapped into DMM/TILER.
1352 */
1353 flags &= ~OMAP_BO_SCANOUT;
1354 flags |= OMAP_BO_MEM_SHMEM;
1355
1356 /*
1357 * Currently don't allow cached buffers. There is some caching
1358 * stuff that needs to be handled better.
1359 */
1360 flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
1361 flags |= tiler_get_cpu_cache_flags();
1362 } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
1363 /*
1364 * OMAP_BO_SCANOUT hints that the buffer doesn't need to be
1365 * tiled. However, to lower the pressure on memory allocation,
1366 * use contiguous memory only if no TILER is available.
1367 */
1368 flags |= OMAP_BO_MEM_DMA_API;
1369 } else if (!(flags & OMAP_BO_MEM_DMABUF)) {
1370 /*
1371 * All other buffers not backed by dma_buf are shmem-backed.
1372 */
1373 flags |= OMAP_BO_MEM_SHMEM;
1374 }
1375
1376 /* Allocate the initialize the OMAP GEM object. */
1377 omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
1378 if (!omap_obj)
1379 return NULL;
1380
1381 obj = &omap_obj->base;
1382 omap_obj->flags = flags;
1383
1384 if (flags & OMAP_BO_TILED) {
1385 /*
1386 * For tiled buffers align dimensions to slot boundaries and
1387 * calculate size based on aligned dimensions.
1388 */
1389 tiler_align(gem2fmt(flags), &gsize.tiled.width,
1390 &gsize.tiled.height);
1391
1392 size = tiler_size(gem2fmt(flags), gsize.tiled.width,
1393 gsize.tiled.height);
1394
1395 omap_obj->width = gsize.tiled.width;
1396 omap_obj->height = gsize.tiled.height;
1397 } else {
1398 size = PAGE_ALIGN(gsize.bytes);
1399 }
1400
1401 /* Initialize the GEM object. */
1402 if (!(flags & OMAP_BO_MEM_SHMEM)) {
1403 drm_gem_private_object_init(dev, obj, size);
1404 } else {
1405 ret = drm_gem_object_init(dev, obj, size);
1406 if (ret)
1407 goto err_free;
1408
1409 mapping = file_inode(obj->filp)->i_mapping;
1410 mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
1411 }
1412
1413 /* Allocate memory if needed. */
1414 if (flags & OMAP_BO_MEM_DMA_API) {
1415 omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
1416 &omap_obj->paddr,
1417 GFP_KERNEL);
1418 if (!omap_obj->vaddr)
1419 goto err_release;
1420 }
1421
1422 spin_lock(&priv->list_lock);
1423 list_add(&omap_obj->mm_list, &priv->obj_list);
1424 spin_unlock(&priv->list_lock);
1425
1426 return obj;
1427
1428err_release:
1429 drm_gem_object_release(obj);
1430err_free:
1431 kfree(omap_obj);
1432 return NULL;
1433}
1434
1435struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
1436 struct sg_table *sgt)
1437{
1438 struct omap_drm_private *priv = dev->dev_private;
1439 struct omap_gem_object *omap_obj;
1440 struct drm_gem_object *obj;
1441 union omap_gem_size gsize;
1442
1443 /* Without a DMM only physically contiguous buffers can be supported. */
1444 if (sgt->orig_nents != 1 && !priv->has_dmm)
1445 return ERR_PTR(-EINVAL);
1446
1447 mutex_lock(&dev->struct_mutex);
1448
1449 gsize.bytes = PAGE_ALIGN(size);
1450 obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
1451 if (!obj) {
1452 obj = ERR_PTR(-ENOMEM);
1453 goto done;
1454 }
1455
1456 omap_obj = to_omap_bo(obj);
1457 omap_obj->sgt = sgt;
1458
1459 if (sgt->orig_nents == 1) {
1460 omap_obj->paddr = sg_dma_address(sgt->sgl);
1461 } else {
1462 /* Create pages list from sgt */
1463 struct sg_page_iter iter;
1464 struct page **pages;
1465 unsigned int npages;
1466 unsigned int i = 0;
1467
1468 npages = DIV_ROUND_UP(size, PAGE_SIZE);
1469 pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
1470 if (!pages) {
1471 omap_gem_free_object(obj);
1472 obj = ERR_PTR(-ENOMEM);
1473 goto done;
1474 }
1475
1476 omap_obj->pages = pages;
1477
1478 for_each_sg_page(sgt->sgl, &iter, sgt->orig_nents, 0) {
1479 pages[i++] = sg_page_iter_page(&iter);
1480 if (i > npages)
1481 break;
1482 }
1483
1484 if (WARN_ON(i != npages)) {
1485 omap_gem_free_object(obj);
1486 obj = ERR_PTR(-ENOMEM);
1487 goto done;
1488 }
1489 }
1490
1491done:
1492 mutex_unlock(&dev->struct_mutex);
1493 return obj;
1494}
1495
1496/* convenience method to construct a GEM buffer object, and userspace handle */
1497int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
1498 union omap_gem_size gsize, uint32_t flags, uint32_t *handle)
1499{
1500 struct drm_gem_object *obj;
1501 int ret;
1502
1503 obj = omap_gem_new(dev, gsize, flags);
1504 if (!obj)
1505 return -ENOMEM;
1506
1507 ret = drm_gem_handle_create(file, obj, handle);
1508 if (ret) {
1509 omap_gem_free_object(obj);
1510 return ret;
1511 }
1512
1513 /* drop reference from allocate - handle holds it now */
1514 drm_gem_object_unreference_unlocked(obj);
1515
1516 return 0;
1517}
1518
1519/* -----------------------------------------------------------------------------
1520 * Init & Cleanup
1521 */
1522
1523/* If DMM is used, we need to set some stuff up.. */
1524void omap_gem_init(struct drm_device *dev)
1525{
1526 struct omap_drm_private *priv = dev->dev_private;
1527 struct omap_drm_usergart *usergart;
1528 const enum tiler_fmt fmts[] = {
1529 TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
1530 };
1531 int i, j;
1532
1533 if (!dmm_is_available()) {
1534 /* DMM only supported on OMAP4 and later, so this isn't fatal */
1535 dev_warn(dev->dev, "DMM not available, disable DMM support\n");
1536 return;
1537 }
1538
1539 usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
1540 if (!usergart)
1541 return;
1542
1543 /* reserve 4k aligned/wide regions for userspace mappings: */
1544 for (i = 0; i < ARRAY_SIZE(fmts); i++) {
1545 uint16_t h = 1, w = PAGE_SIZE >> i;
1546 tiler_align(fmts[i], &w, &h);
1547 /* note: since each region is 1 4kb page wide, and minimum
1548 * number of rows, the height ends up being the same as the
1549 * # of pages in the region
1550 */
1551 usergart[i].height = h;
1552 usergart[i].height_shift = ilog2(h);
1553 usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
1554 usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
1555 for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
1556 struct omap_drm_usergart_entry *entry;
1557 struct tiler_block *block;
1558
1559 entry = &usergart[i].entry[j];
1560 block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
1561 if (IS_ERR(block)) {
1562 dev_err(dev->dev,
1563 "reserve failed: %d, %d, %ld\n",
1564 i, j, PTR_ERR(block));
1565 return;
1566 }
1567 entry->paddr = tiler_ssptr(block);
1568 entry->block = block;
1569
1570 DBG("%d:%d: %dx%d: paddr=%pad stride=%d", i, j, w, h,
1571 &entry->paddr,
1572 usergart[i].stride_pfn << PAGE_SHIFT);
1573 }
1574 }
1575
1576 priv->usergart = usergart;
1577 priv->has_dmm = true;
1578}
1579
1580void omap_gem_deinit(struct drm_device *dev)
1581{
1582 struct omap_drm_private *priv = dev->dev_private;
1583
1584 /* I believe we can rely on there being no more outstanding GEM
1585 * objects which could depend on usergart/dmm at this point.
1586 */
1587 kfree(priv->usergart);
1588}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
4 * Author: Rob Clark <rob.clark@linaro.org>
5 */
6
7#include <linux/dma-mapping.h>
8#include <linux/seq_file.h>
9#include <linux/shmem_fs.h>
10#include <linux/spinlock.h>
11#include <linux/pfn_t.h>
12#include <linux/vmalloc.h>
13
14#include <drm/drm_prime.h>
15#include <drm/drm_vma_manager.h>
16
17#include "omap_drv.h"
18#include "omap_dmm_tiler.h"
19
20/*
21 * GEM buffer object implementation.
22 */
23
24/* note: we use upper 8 bits of flags for driver-internal flags: */
25#define OMAP_BO_MEM_DMA_API 0x01000000 /* memory allocated with the dma_alloc_* API */
26#define OMAP_BO_MEM_SHMEM 0x02000000 /* memory allocated through shmem backing */
27#define OMAP_BO_MEM_DMABUF 0x08000000 /* memory imported from a dmabuf */
28
29struct omap_gem_object {
30 struct drm_gem_object base;
31
32 struct list_head mm_list;
33
34 u32 flags;
35
36 /** width/height for tiled formats (rounded up to slot boundaries) */
37 u16 width, height;
38
39 /** roll applied when mapping to DMM */
40 u32 roll;
41
42 /** protects pin_cnt, block, pages, dma_addrs and vaddr */
43 struct mutex lock;
44
45 /**
46 * dma_addr contains the buffer DMA address. It is valid for
47 *
48 * - buffers allocated through the DMA mapping API (with the
49 * OMAP_BO_MEM_DMA_API flag set)
50 *
51 * - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
52 * if they are physically contiguous
53 *
54 * - buffers mapped through the TILER when pin_cnt is not zero, in which
55 * case the DMA address points to the TILER aperture
56 *
57 * Physically contiguous buffers have their DMA address equal to the
58 * physical address as we don't remap those buffers through the TILER.
59 *
60 * Buffers mapped to the TILER have their DMA address pointing to the
61 * TILER aperture. As TILER mappings are refcounted (through pin_cnt)
62 * the DMA address must be accessed through omap_gem_pin() to ensure
63 * that the mapping won't disappear unexpectedly. References must be
64 * released with omap_gem_unpin().
65 */
66 dma_addr_t dma_addr;
67
68 /**
69 * # of users
70 */
71 refcount_t pin_cnt;
72
73 /**
74 * If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
75 * is set and the sgt field is valid.
76 */
77 struct sg_table *sgt;
78
79 /**
80 * tiler block used when buffer is remapped in DMM/TILER.
81 */
82 struct tiler_block *block;
83
84 /**
85 * Array of backing pages, if allocated. Note that pages are never
86 * allocated for buffers originally allocated from contiguous memory
87 */
88 struct page **pages;
89
90 /** addresses corresponding to pages in above array */
91 dma_addr_t *dma_addrs;
92
93 /**
94 * Virtual address, if mapped.
95 */
96 void *vaddr;
97};
98
99#define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
100
101/* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
102 * not necessarily pinned in TILER all the time, and (b) when they are
103 * they are not necessarily page aligned, we reserve one or more small
104 * regions in each of the 2d containers to use as a user-GART where we
105 * can create a second page-aligned mapping of parts of the buffer
106 * being accessed from userspace.
107 *
108 * Note that we could optimize slightly when we know that multiple
109 * tiler containers are backed by the same PAT.. but I'll leave that
110 * for later..
111 */
112#define NUM_USERGART_ENTRIES 2
113struct omap_drm_usergart_entry {
114 struct tiler_block *block; /* the reserved tiler block */
115 dma_addr_t dma_addr;
116 struct drm_gem_object *obj; /* the current pinned obj */
117 pgoff_t obj_pgoff; /* page offset of obj currently
118 mapped in */
119};
120
121struct omap_drm_usergart {
122 struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
123 int height; /* height in rows */
124 int height_shift; /* ilog2(height in rows) */
125 int slot_shift; /* ilog2(width per slot) */
126 int stride_pfn; /* stride in pages */
127 int last; /* index of last used entry */
128};
129
130/* -----------------------------------------------------------------------------
131 * Helpers
132 */
133
134/** get mmap offset */
135u64 omap_gem_mmap_offset(struct drm_gem_object *obj)
136{
137 struct drm_device *dev = obj->dev;
138 int ret;
139 size_t size;
140
141 /* Make it mmapable */
142 size = omap_gem_mmap_size(obj);
143 ret = drm_gem_create_mmap_offset_size(obj, size);
144 if (ret) {
145 dev_err(dev->dev, "could not allocate mmap offset\n");
146 return 0;
147 }
148
149 return drm_vma_node_offset_addr(&obj->vma_node);
150}
151
152static bool omap_gem_sgt_is_contiguous(struct sg_table *sgt, size_t size)
153{
154 return !(drm_prime_get_contiguous_size(sgt) < size);
155}
156
157static bool omap_gem_is_contiguous(struct omap_gem_object *omap_obj)
158{
159 if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
160 return true;
161
162 if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) &&
163 omap_gem_sgt_is_contiguous(omap_obj->sgt, omap_obj->base.size))
164 return true;
165
166 return false;
167}
168
169/* -----------------------------------------------------------------------------
170 * Eviction
171 */
172
173static void omap_gem_evict_entry(struct drm_gem_object *obj,
174 enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
175{
176 struct omap_gem_object *omap_obj = to_omap_bo(obj);
177 struct omap_drm_private *priv = obj->dev->dev_private;
178 int n = priv->usergart[fmt].height;
179 size_t size = PAGE_SIZE * n;
180 loff_t off = omap_gem_mmap_offset(obj) +
181 (entry->obj_pgoff << PAGE_SHIFT);
182 const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
183
184 if (m > 1) {
185 int i;
186 /* if stride > than PAGE_SIZE then sparse mapping: */
187 for (i = n; i > 0; i--) {
188 unmap_mapping_range(obj->dev->anon_inode->i_mapping,
189 off, PAGE_SIZE, 1);
190 off += PAGE_SIZE * m;
191 }
192 } else {
193 unmap_mapping_range(obj->dev->anon_inode->i_mapping,
194 off, size, 1);
195 }
196
197 entry->obj = NULL;
198}
199
200/* Evict a buffer from usergart, if it is mapped there */
201static void omap_gem_evict(struct drm_gem_object *obj)
202{
203 struct omap_gem_object *omap_obj = to_omap_bo(obj);
204 struct omap_drm_private *priv = obj->dev->dev_private;
205
206 if (omap_obj->flags & OMAP_BO_TILED_MASK) {
207 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
208 int i;
209
210 for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
211 struct omap_drm_usergart_entry *entry =
212 &priv->usergart[fmt].entry[i];
213
214 if (entry->obj == obj)
215 omap_gem_evict_entry(obj, fmt, entry);
216 }
217 }
218}
219
220/* -----------------------------------------------------------------------------
221 * Page Management
222 */
223
224/*
225 * Ensure backing pages are allocated. Must be called with the omap_obj.lock
226 * held.
227 */
228static int omap_gem_attach_pages(struct drm_gem_object *obj)
229{
230 struct drm_device *dev = obj->dev;
231 struct omap_gem_object *omap_obj = to_omap_bo(obj);
232 struct page **pages;
233 int npages = obj->size >> PAGE_SHIFT;
234 int i, ret;
235 dma_addr_t *addrs;
236
237 lockdep_assert_held(&omap_obj->lock);
238
239 /*
240 * If not using shmem (in which case backing pages don't need to be
241 * allocated) or if pages are already allocated we're done.
242 */
243 if (!(omap_obj->flags & OMAP_BO_MEM_SHMEM) || omap_obj->pages)
244 return 0;
245
246 pages = drm_gem_get_pages(obj);
247 if (IS_ERR(pages)) {
248 dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
249 return PTR_ERR(pages);
250 }
251
252 /* for non-cached buffers, ensure the new pages are clean because
253 * DSS, GPU, etc. are not cache coherent:
254 */
255 if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
256 addrs = kmalloc_array(npages, sizeof(*addrs), GFP_KERNEL);
257 if (!addrs) {
258 ret = -ENOMEM;
259 goto free_pages;
260 }
261
262 for (i = 0; i < npages; i++) {
263 addrs[i] = dma_map_page(dev->dev, pages[i],
264 0, PAGE_SIZE, DMA_TO_DEVICE);
265
266 if (dma_mapping_error(dev->dev, addrs[i])) {
267 dev_warn(dev->dev,
268 "%s: failed to map page\n", __func__);
269
270 for (i = i - 1; i >= 0; --i) {
271 dma_unmap_page(dev->dev, addrs[i],
272 PAGE_SIZE, DMA_TO_DEVICE);
273 }
274
275 ret = -ENOMEM;
276 goto free_addrs;
277 }
278 }
279 } else {
280 addrs = kcalloc(npages, sizeof(*addrs), GFP_KERNEL);
281 if (!addrs) {
282 ret = -ENOMEM;
283 goto free_pages;
284 }
285 }
286
287 omap_obj->dma_addrs = addrs;
288 omap_obj->pages = pages;
289
290 return 0;
291
292free_addrs:
293 kfree(addrs);
294free_pages:
295 drm_gem_put_pages(obj, pages, true, false);
296
297 return ret;
298}
299
300/* Release backing pages. Must be called with the omap_obj.lock held. */
301static void omap_gem_detach_pages(struct drm_gem_object *obj)
302{
303 struct omap_gem_object *omap_obj = to_omap_bo(obj);
304 unsigned int npages = obj->size >> PAGE_SHIFT;
305 unsigned int i;
306
307 lockdep_assert_held(&omap_obj->lock);
308
309 for (i = 0; i < npages; i++) {
310 if (omap_obj->dma_addrs[i])
311 dma_unmap_page(obj->dev->dev, omap_obj->dma_addrs[i],
312 PAGE_SIZE, DMA_TO_DEVICE);
313 }
314
315 kfree(omap_obj->dma_addrs);
316 omap_obj->dma_addrs = NULL;
317
318 drm_gem_put_pages(obj, omap_obj->pages, true, false);
319 omap_obj->pages = NULL;
320}
321
322/* get buffer flags */
323u32 omap_gem_flags(struct drm_gem_object *obj)
324{
325 return to_omap_bo(obj)->flags;
326}
327
328/** get mmap size */
329size_t omap_gem_mmap_size(struct drm_gem_object *obj)
330{
331 struct omap_gem_object *omap_obj = to_omap_bo(obj);
332 size_t size = obj->size;
333
334 if (omap_obj->flags & OMAP_BO_TILED_MASK) {
335 /* for tiled buffers, the virtual size has stride rounded up
336 * to 4kb.. (to hide the fact that row n+1 might start 16kb or
337 * 32kb later!). But we don't back the entire buffer with
338 * pages, only the valid picture part.. so need to adjust for
339 * this in the size used to mmap and generate mmap offset
340 */
341 size = tiler_vsize(gem2fmt(omap_obj->flags),
342 omap_obj->width, omap_obj->height);
343 }
344
345 return size;
346}
347
348/* -----------------------------------------------------------------------------
349 * Fault Handling
350 */
351
352/* Normal handling for the case of faulting in non-tiled buffers */
353static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj,
354 struct vm_area_struct *vma, struct vm_fault *vmf)
355{
356 struct omap_gem_object *omap_obj = to_omap_bo(obj);
357 unsigned long pfn;
358 pgoff_t pgoff;
359
360 /* We don't use vmf->pgoff since that has the fake offset: */
361 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
362
363 if (omap_obj->pages) {
364 omap_gem_cpu_sync_page(obj, pgoff);
365 pfn = page_to_pfn(omap_obj->pages[pgoff]);
366 } else {
367 BUG_ON(!omap_gem_is_contiguous(omap_obj));
368 pfn = (omap_obj->dma_addr >> PAGE_SHIFT) + pgoff;
369 }
370
371 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
372 pfn, pfn << PAGE_SHIFT);
373
374 return vmf_insert_mixed(vma, vmf->address,
375 __pfn_to_pfn_t(pfn, PFN_DEV));
376}
377
378/* Special handling for the case of faulting in 2d tiled buffers */
379static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj,
380 struct vm_area_struct *vma, struct vm_fault *vmf)
381{
382 struct omap_gem_object *omap_obj = to_omap_bo(obj);
383 struct omap_drm_private *priv = obj->dev->dev_private;
384 struct omap_drm_usergart_entry *entry;
385 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
386 struct page *pages[64]; /* XXX is this too much to have on stack? */
387 unsigned long pfn;
388 pgoff_t pgoff, base_pgoff;
389 unsigned long vaddr;
390 int i, err, slots;
391 vm_fault_t ret = VM_FAULT_NOPAGE;
392
393 /*
394 * Note the height of the slot is also equal to the number of pages
395 * that need to be mapped in to fill 4kb wide CPU page. If the slot
396 * height is 64, then 64 pages fill a 4kb wide by 64 row region.
397 */
398 const int n = priv->usergart[fmt].height;
399 const int n_shift = priv->usergart[fmt].height_shift;
400
401 /*
402 * If buffer width in bytes > PAGE_SIZE then the virtual stride is
403 * rounded up to next multiple of PAGE_SIZE.. this need to be taken
404 * into account in some of the math, so figure out virtual stride
405 * in pages
406 */
407 const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
408
409 /* We don't use vmf->pgoff since that has the fake offset: */
410 pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
411
412 /*
413 * Actual address we start mapping at is rounded down to previous slot
414 * boundary in the y direction:
415 */
416 base_pgoff = round_down(pgoff, m << n_shift);
417
418 /* figure out buffer width in slots */
419 slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
420
421 vaddr = vmf->address - ((pgoff - base_pgoff) << PAGE_SHIFT);
422
423 entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
424
425 /* evict previous buffer using this usergart entry, if any: */
426 if (entry->obj)
427 omap_gem_evict_entry(entry->obj, fmt, entry);
428
429 entry->obj = obj;
430 entry->obj_pgoff = base_pgoff;
431
432 /* now convert base_pgoff to phys offset from virt offset: */
433 base_pgoff = (base_pgoff >> n_shift) * slots;
434
435 /* for wider-than 4k.. figure out which part of the slot-row we want: */
436 if (m > 1) {
437 int off = pgoff % m;
438 entry->obj_pgoff += off;
439 base_pgoff /= m;
440 slots = min(slots - (off << n_shift), n);
441 base_pgoff += off << n_shift;
442 vaddr += off << PAGE_SHIFT;
443 }
444
445 /*
446 * Map in pages. Beyond the valid pixel part of the buffer, we set
447 * pages[i] to NULL to get a dummy page mapped in.. if someone
448 * reads/writes it they will get random/undefined content, but at
449 * least it won't be corrupting whatever other random page used to
450 * be mapped in, or other undefined behavior.
451 */
452 memcpy(pages, &omap_obj->pages[base_pgoff],
453 sizeof(struct page *) * slots);
454 memset(pages + slots, 0,
455 sizeof(struct page *) * (n - slots));
456
457 err = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
458 if (err) {
459 ret = vmf_error(err);
460 dev_err(obj->dev->dev, "failed to pin: %d\n", err);
461 return ret;
462 }
463
464 pfn = entry->dma_addr >> PAGE_SHIFT;
465
466 VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
467 pfn, pfn << PAGE_SHIFT);
468
469 for (i = n; i > 0; i--) {
470 ret = vmf_insert_mixed(vma,
471 vaddr, __pfn_to_pfn_t(pfn, PFN_DEV));
472 if (ret & VM_FAULT_ERROR)
473 break;
474 pfn += priv->usergart[fmt].stride_pfn;
475 vaddr += PAGE_SIZE * m;
476 }
477
478 /* simple round-robin: */
479 priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
480 % NUM_USERGART_ENTRIES;
481
482 return ret;
483}
484
485/**
486 * omap_gem_fault - pagefault handler for GEM objects
487 * @vmf: fault detail
488 *
489 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
490 * does most of the work for us including the actual map/unmap calls
491 * but we need to do the actual page work.
492 *
493 * The VMA was set up by GEM. In doing so it also ensured that the
494 * vma->vm_private_data points to the GEM object that is backing this
495 * mapping.
496 */
497static vm_fault_t omap_gem_fault(struct vm_fault *vmf)
498{
499 struct vm_area_struct *vma = vmf->vma;
500 struct drm_gem_object *obj = vma->vm_private_data;
501 struct omap_gem_object *omap_obj = to_omap_bo(obj);
502 int err;
503 vm_fault_t ret;
504
505 /* Make sure we don't parallel update on a fault, nor move or remove
506 * something from beneath our feet
507 */
508 mutex_lock(&omap_obj->lock);
509
510 /* if a shmem backed object, make sure we have pages attached now */
511 err = omap_gem_attach_pages(obj);
512 if (err) {
513 ret = vmf_error(err);
514 goto fail;
515 }
516
517 /* where should we do corresponding put_pages().. we are mapping
518 * the original page, rather than thru a GART, so we can't rely
519 * on eviction to trigger this. But munmap() or all mappings should
520 * probably trigger put_pages()?
521 */
522
523 if (omap_obj->flags & OMAP_BO_TILED_MASK)
524 ret = omap_gem_fault_2d(obj, vma, vmf);
525 else
526 ret = omap_gem_fault_1d(obj, vma, vmf);
527
528
529fail:
530 mutex_unlock(&omap_obj->lock);
531 return ret;
532}
533
534static int omap_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
535{
536 struct omap_gem_object *omap_obj = to_omap_bo(obj);
537
538 vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP | VM_IO | VM_MIXEDMAP);
539
540 if (omap_obj->flags & OMAP_BO_WC) {
541 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
542 } else if (omap_obj->flags & OMAP_BO_UNCACHED) {
543 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
544 } else {
545 /*
546 * We do have some private objects, at least for scanout buffers
547 * on hardware without DMM/TILER. But these are allocated write-
548 * combine
549 */
550 if (WARN_ON(!obj->filp))
551 return -EINVAL;
552
553 /*
554 * Shunt off cached objs to shmem file so they have their own
555 * address_space (so unmap_mapping_range does what we want,
556 * in particular in the case of mmap'd dmabufs)
557 */
558 vma->vm_pgoff -= drm_vma_node_start(&obj->vma_node);
559 vma_set_file(vma, obj->filp);
560
561 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
562 }
563
564 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
565
566 return 0;
567}
568
569/* -----------------------------------------------------------------------------
570 * Dumb Buffers
571 */
572
573/**
574 * omap_gem_dumb_create - create a dumb buffer
575 * @file: our client file
576 * @dev: our device
577 * @args: the requested arguments copied from userspace
578 *
579 * Allocate a buffer suitable for use for a frame buffer of the
580 * form described by user space. Give userspace a handle by which
581 * to reference it.
582 */
583int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
584 struct drm_mode_create_dumb *args)
585{
586 union omap_gem_size gsize;
587
588 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
589
590 args->size = PAGE_ALIGN(args->pitch * args->height);
591
592 gsize = (union omap_gem_size){
593 .bytes = args->size,
594 };
595
596 return omap_gem_new_handle(dev, file, gsize,
597 OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
598}
599
600/**
601 * omap_gem_dumb_map_offset - create an offset for a dumb buffer
602 * @file: our drm client file
603 * @dev: drm device
604 * @handle: GEM handle to the object (from dumb_create)
605 * @offset: memory map offset placeholder
606 *
607 * Do the necessary setup to allow the mapping of the frame buffer
608 * into user memory. We don't have to do much here at the moment.
609 */
610int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
611 u32 handle, u64 *offset)
612{
613 struct drm_gem_object *obj;
614 int ret = 0;
615
616 /* GEM does all our handle to object mapping */
617 obj = drm_gem_object_lookup(file, handle);
618 if (obj == NULL) {
619 ret = -ENOENT;
620 goto fail;
621 }
622
623 *offset = omap_gem_mmap_offset(obj);
624
625 drm_gem_object_put(obj);
626
627fail:
628 return ret;
629}
630
631#ifdef CONFIG_DRM_FBDEV_EMULATION
632/* Set scrolling position. This allows us to implement fast scrolling
633 * for console.
634 *
635 * Call only from non-atomic contexts.
636 */
637int omap_gem_roll(struct drm_gem_object *obj, u32 roll)
638{
639 struct omap_gem_object *omap_obj = to_omap_bo(obj);
640 u32 npages = obj->size >> PAGE_SHIFT;
641 int ret = 0;
642
643 if (roll > npages) {
644 dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
645 return -EINVAL;
646 }
647
648 omap_obj->roll = roll;
649
650 mutex_lock(&omap_obj->lock);
651
652 /* if we aren't mapped yet, we don't need to do anything */
653 if (omap_obj->block) {
654 ret = omap_gem_attach_pages(obj);
655 if (ret)
656 goto fail;
657
658 ret = tiler_pin(omap_obj->block, omap_obj->pages, npages,
659 roll, true);
660 if (ret)
661 dev_err(obj->dev->dev, "could not repin: %d\n", ret);
662 }
663
664fail:
665 mutex_unlock(&omap_obj->lock);
666
667 return ret;
668}
669#endif
670
671/* -----------------------------------------------------------------------------
672 * Memory Management & DMA Sync
673 */
674
675/*
676 * shmem buffers that are mapped cached are not coherent.
677 *
678 * We keep track of dirty pages using page faulting to perform cache management.
679 * When a page is mapped to the CPU in read/write mode the device can't access
680 * it and omap_obj->dma_addrs[i] is NULL. When a page is mapped to the device
681 * the omap_obj->dma_addrs[i] is set to the DMA address, and the page is
682 * unmapped from the CPU.
683 */
684static inline bool omap_gem_is_cached_coherent(struct drm_gem_object *obj)
685{
686 struct omap_gem_object *omap_obj = to_omap_bo(obj);
687
688 return !((omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
689 ((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED));
690}
691
692/* Sync the buffer for CPU access.. note pages should already be
693 * attached, ie. omap_gem_get_pages()
694 */
695void omap_gem_cpu_sync_page(struct drm_gem_object *obj, int pgoff)
696{
697 struct drm_device *dev = obj->dev;
698 struct omap_gem_object *omap_obj = to_omap_bo(obj);
699
700 if (omap_gem_is_cached_coherent(obj))
701 return;
702
703 if (omap_obj->dma_addrs[pgoff]) {
704 dma_unmap_page(dev->dev, omap_obj->dma_addrs[pgoff],
705 PAGE_SIZE, DMA_TO_DEVICE);
706 omap_obj->dma_addrs[pgoff] = 0;
707 }
708}
709
710/* sync the buffer for DMA access */
711void omap_gem_dma_sync_buffer(struct drm_gem_object *obj,
712 enum dma_data_direction dir)
713{
714 struct drm_device *dev = obj->dev;
715 struct omap_gem_object *omap_obj = to_omap_bo(obj);
716 int i, npages = obj->size >> PAGE_SHIFT;
717 struct page **pages = omap_obj->pages;
718 bool dirty = false;
719
720 if (omap_gem_is_cached_coherent(obj))
721 return;
722
723 for (i = 0; i < npages; i++) {
724 if (!omap_obj->dma_addrs[i]) {
725 dma_addr_t addr;
726
727 addr = dma_map_page(dev->dev, pages[i], 0,
728 PAGE_SIZE, dir);
729 if (dma_mapping_error(dev->dev, addr)) {
730 dev_warn(dev->dev, "%s: failed to map page\n",
731 __func__);
732 break;
733 }
734
735 dirty = true;
736 omap_obj->dma_addrs[i] = addr;
737 }
738 }
739
740 if (dirty) {
741 unmap_mapping_range(obj->filp->f_mapping, 0,
742 omap_gem_mmap_size(obj), 1);
743 }
744}
745
746static int omap_gem_pin_tiler(struct drm_gem_object *obj)
747{
748 struct omap_gem_object *omap_obj = to_omap_bo(obj);
749 u32 npages = obj->size >> PAGE_SHIFT;
750 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
751 struct tiler_block *block;
752 int ret;
753
754 BUG_ON(omap_obj->block);
755
756 if (omap_obj->flags & OMAP_BO_TILED_MASK) {
757 block = tiler_reserve_2d(fmt, omap_obj->width, omap_obj->height,
758 PAGE_SIZE);
759 } else {
760 block = tiler_reserve_1d(obj->size);
761 }
762
763 if (IS_ERR(block)) {
764 ret = PTR_ERR(block);
765 dev_err(obj->dev->dev, "could not remap: %d (%d)\n", ret, fmt);
766 goto fail;
767 }
768
769 /* TODO: enable async refill.. */
770 ret = tiler_pin(block, omap_obj->pages, npages, omap_obj->roll, true);
771 if (ret) {
772 tiler_release(block);
773 dev_err(obj->dev->dev, "could not pin: %d\n", ret);
774 goto fail;
775 }
776
777 omap_obj->dma_addr = tiler_ssptr(block);
778 omap_obj->block = block;
779
780 DBG("got dma address: %pad", &omap_obj->dma_addr);
781
782fail:
783 return ret;
784}
785
786/**
787 * omap_gem_pin() - Pin a GEM object in memory
788 * @obj: the GEM object
789 * @dma_addr: the DMA address
790 *
791 * Pin the given GEM object in memory and fill the dma_addr pointer with the
792 * object's DMA address. If the buffer is not physically contiguous it will be
793 * remapped through the TILER to provide a contiguous view.
794 *
795 * Pins are reference-counted, calling this function multiple times is allowed
796 * as long the corresponding omap_gem_unpin() calls are balanced.
797 *
798 * Return 0 on success or a negative error code otherwise.
799 */
800int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr)
801{
802 struct omap_drm_private *priv = obj->dev->dev_private;
803 struct omap_gem_object *omap_obj = to_omap_bo(obj);
804 int ret = 0;
805
806 mutex_lock(&omap_obj->lock);
807
808 if (!omap_gem_is_contiguous(omap_obj)) {
809 if (refcount_read(&omap_obj->pin_cnt) == 0) {
810
811 refcount_set(&omap_obj->pin_cnt, 1);
812
813 ret = omap_gem_attach_pages(obj);
814 if (ret)
815 goto fail;
816
817 if (omap_obj->flags & OMAP_BO_SCANOUT) {
818 if (priv->has_dmm) {
819 ret = omap_gem_pin_tiler(obj);
820 if (ret)
821 goto fail;
822 }
823 }
824 } else {
825 refcount_inc(&omap_obj->pin_cnt);
826 }
827 }
828
829 if (dma_addr)
830 *dma_addr = omap_obj->dma_addr;
831
832fail:
833 mutex_unlock(&omap_obj->lock);
834
835 return ret;
836}
837
838/**
839 * omap_gem_unpin_locked() - Unpin a GEM object from memory
840 * @obj: the GEM object
841 *
842 * omap_gem_unpin() without locking.
843 */
844static void omap_gem_unpin_locked(struct drm_gem_object *obj)
845{
846 struct omap_drm_private *priv = obj->dev->dev_private;
847 struct omap_gem_object *omap_obj = to_omap_bo(obj);
848 int ret;
849
850 if (omap_gem_is_contiguous(omap_obj))
851 return;
852
853 if (refcount_dec_and_test(&omap_obj->pin_cnt)) {
854 if (omap_obj->sgt) {
855 sg_free_table(omap_obj->sgt);
856 kfree(omap_obj->sgt);
857 omap_obj->sgt = NULL;
858 }
859 if (!(omap_obj->flags & OMAP_BO_SCANOUT))
860 return;
861 if (priv->has_dmm) {
862 ret = tiler_unpin(omap_obj->block);
863 if (ret) {
864 dev_err(obj->dev->dev,
865 "could not unpin pages: %d\n", ret);
866 }
867 ret = tiler_release(omap_obj->block);
868 if (ret) {
869 dev_err(obj->dev->dev,
870 "could not release unmap: %d\n", ret);
871 }
872 omap_obj->dma_addr = 0;
873 omap_obj->block = NULL;
874 }
875 }
876}
877
878/**
879 * omap_gem_unpin() - Unpin a GEM object from memory
880 * @obj: the GEM object
881 *
882 * Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are
883 * reference-counted, the actual unpin will only be performed when the number
884 * of calls to this function matches the number of calls to omap_gem_pin().
885 */
886void omap_gem_unpin(struct drm_gem_object *obj)
887{
888 struct omap_gem_object *omap_obj = to_omap_bo(obj);
889
890 mutex_lock(&omap_obj->lock);
891 omap_gem_unpin_locked(obj);
892 mutex_unlock(&omap_obj->lock);
893}
894
895/* Get rotated scanout address (only valid if already pinned), at the
896 * specified orientation and x,y offset from top-left corner of buffer
897 * (only valid for tiled 2d buffers)
898 */
899int omap_gem_rotated_dma_addr(struct drm_gem_object *obj, u32 orient,
900 int x, int y, dma_addr_t *dma_addr)
901{
902 struct omap_gem_object *omap_obj = to_omap_bo(obj);
903 int ret = -EINVAL;
904
905 mutex_lock(&omap_obj->lock);
906
907 if ((refcount_read(&omap_obj->pin_cnt) > 0) && omap_obj->block &&
908 (omap_obj->flags & OMAP_BO_TILED_MASK)) {
909 *dma_addr = tiler_tsptr(omap_obj->block, orient, x, y);
910 ret = 0;
911 }
912
913 mutex_unlock(&omap_obj->lock);
914
915 return ret;
916}
917
918/* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
919int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient)
920{
921 struct omap_gem_object *omap_obj = to_omap_bo(obj);
922 int ret = -EINVAL;
923 if (omap_obj->flags & OMAP_BO_TILED_MASK)
924 ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
925 return ret;
926}
927
928/* if !remap, and we don't have pages backing, then fail, rather than
929 * increasing the pin count (which we don't really do yet anyways,
930 * because we don't support swapping pages back out). And 'remap'
931 * might not be quite the right name, but I wanted to keep it working
932 * similarly to omap_gem_pin(). Note though that mutex is not
933 * aquired if !remap (because this can be called in atomic ctxt),
934 * but probably omap_gem_unpin() should be changed to work in the
935 * same way. If !remap, a matching omap_gem_put_pages() call is not
936 * required (and should not be made).
937 */
938int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
939 bool remap)
940{
941 struct omap_gem_object *omap_obj = to_omap_bo(obj);
942 int ret = 0;
943
944 mutex_lock(&omap_obj->lock);
945
946 if (remap) {
947 ret = omap_gem_attach_pages(obj);
948 if (ret)
949 goto unlock;
950 }
951
952 if (!omap_obj->pages) {
953 ret = -ENOMEM;
954 goto unlock;
955 }
956
957 *pages = omap_obj->pages;
958
959unlock:
960 mutex_unlock(&omap_obj->lock);
961
962 return ret;
963}
964
965/* release pages when DMA no longer being performed */
966int omap_gem_put_pages(struct drm_gem_object *obj)
967{
968 /* do something here if we dynamically attach/detach pages.. at
969 * least they would no longer need to be pinned if everyone has
970 * released the pages..
971 */
972 return 0;
973}
974
975struct sg_table *omap_gem_get_sg(struct drm_gem_object *obj,
976 enum dma_data_direction dir)
977{
978 struct omap_gem_object *omap_obj = to_omap_bo(obj);
979 dma_addr_t addr;
980 struct sg_table *sgt;
981 struct scatterlist *sg;
982 unsigned int count, len, stride, i;
983 int ret;
984
985 ret = omap_gem_pin(obj, &addr);
986 if (ret)
987 return ERR_PTR(ret);
988
989 mutex_lock(&omap_obj->lock);
990
991 sgt = omap_obj->sgt;
992 if (sgt)
993 goto out;
994
995 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
996 if (!sgt) {
997 ret = -ENOMEM;
998 goto err_unpin;
999 }
1000
1001 if (addr) {
1002 if (omap_obj->flags & OMAP_BO_TILED_MASK) {
1003 enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
1004
1005 len = omap_obj->width << (int)fmt;
1006 count = omap_obj->height;
1007 stride = tiler_stride(fmt, 0);
1008 } else {
1009 len = obj->size;
1010 count = 1;
1011 stride = 0;
1012 }
1013 } else {
1014 count = obj->size >> PAGE_SHIFT;
1015 }
1016
1017 ret = sg_alloc_table(sgt, count, GFP_KERNEL);
1018 if (ret)
1019 goto err_free;
1020
1021 /* this must be after omap_gem_pin() to ensure we have pages attached */
1022 omap_gem_dma_sync_buffer(obj, dir);
1023
1024 if (addr) {
1025 for_each_sg(sgt->sgl, sg, count, i) {
1026 sg_set_page(sg, pfn_to_page(__phys_to_pfn(addr)),
1027 len, offset_in_page(addr));
1028 sg_dma_address(sg) = addr;
1029 sg_dma_len(sg) = len;
1030
1031 addr += stride;
1032 }
1033 } else {
1034 for_each_sg(sgt->sgl, sg, count, i) {
1035 sg_set_page(sg, omap_obj->pages[i], PAGE_SIZE, 0);
1036 sg_dma_address(sg) = omap_obj->dma_addrs[i];
1037 sg_dma_len(sg) = PAGE_SIZE;
1038 }
1039 }
1040
1041 omap_obj->sgt = sgt;
1042out:
1043 mutex_unlock(&omap_obj->lock);
1044 return sgt;
1045
1046err_free:
1047 kfree(sgt);
1048err_unpin:
1049 mutex_unlock(&omap_obj->lock);
1050 omap_gem_unpin(obj);
1051 return ERR_PTR(ret);
1052}
1053
1054void omap_gem_put_sg(struct drm_gem_object *obj, struct sg_table *sgt)
1055{
1056 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1057
1058 if (WARN_ON(omap_obj->sgt != sgt))
1059 return;
1060
1061 omap_gem_unpin(obj);
1062}
1063
1064#ifdef CONFIG_DRM_FBDEV_EMULATION
1065/*
1066 * Get kernel virtual address for CPU access.. this more or less only
1067 * exists for omap_fbdev.
1068 */
1069void *omap_gem_vaddr(struct drm_gem_object *obj)
1070{
1071 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1072 void *vaddr;
1073 int ret;
1074
1075 mutex_lock(&omap_obj->lock);
1076
1077 if (!omap_obj->vaddr) {
1078 ret = omap_gem_attach_pages(obj);
1079 if (ret) {
1080 vaddr = ERR_PTR(ret);
1081 goto unlock;
1082 }
1083
1084 omap_obj->vaddr = vmap(omap_obj->pages, obj->size >> PAGE_SHIFT,
1085 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
1086 }
1087
1088 vaddr = omap_obj->vaddr;
1089
1090unlock:
1091 mutex_unlock(&omap_obj->lock);
1092 return vaddr;
1093}
1094#endif
1095
1096/* -----------------------------------------------------------------------------
1097 * Power Management
1098 */
1099
1100#ifdef CONFIG_PM
1101/* re-pin objects in DMM in resume path: */
1102int omap_gem_resume(struct drm_device *dev)
1103{
1104 struct omap_drm_private *priv = dev->dev_private;
1105 struct omap_gem_object *omap_obj;
1106 int ret = 0;
1107
1108 mutex_lock(&priv->list_lock);
1109 list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
1110 if (omap_obj->block) {
1111 struct drm_gem_object *obj = &omap_obj->base;
1112 u32 npages = obj->size >> PAGE_SHIFT;
1113
1114 WARN_ON(!omap_obj->pages); /* this can't happen */
1115 ret = tiler_pin(omap_obj->block,
1116 omap_obj->pages, npages,
1117 omap_obj->roll, true);
1118 if (ret) {
1119 dev_err(dev->dev, "could not repin: %d\n", ret);
1120 goto done;
1121 }
1122 }
1123 }
1124
1125done:
1126 mutex_unlock(&priv->list_lock);
1127 return ret;
1128}
1129#endif
1130
1131/* -----------------------------------------------------------------------------
1132 * DebugFS
1133 */
1134
1135#ifdef CONFIG_DEBUG_FS
1136void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
1137{
1138 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1139 u64 off;
1140
1141 off = drm_vma_node_start(&obj->vma_node);
1142
1143 mutex_lock(&omap_obj->lock);
1144
1145 seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
1146 omap_obj->flags, obj->name, kref_read(&obj->refcount),
1147 off, &omap_obj->dma_addr,
1148 refcount_read(&omap_obj->pin_cnt),
1149 omap_obj->vaddr, omap_obj->roll);
1150
1151 if (omap_obj->flags & OMAP_BO_TILED_MASK) {
1152 seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
1153 if (omap_obj->block) {
1154 struct tcm_area *area = &omap_obj->block->area;
1155 seq_printf(m, " (%dx%d, %dx%d)",
1156 area->p0.x, area->p0.y,
1157 area->p1.x, area->p1.y);
1158 }
1159 } else {
1160 seq_printf(m, " %zu", obj->size);
1161 }
1162
1163 mutex_unlock(&omap_obj->lock);
1164
1165 seq_printf(m, "\n");
1166}
1167
1168void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
1169{
1170 struct omap_gem_object *omap_obj;
1171 int count = 0;
1172 size_t size = 0;
1173
1174 list_for_each_entry(omap_obj, list, mm_list) {
1175 struct drm_gem_object *obj = &omap_obj->base;
1176 seq_printf(m, " ");
1177 omap_gem_describe(obj, m);
1178 count++;
1179 size += obj->size;
1180 }
1181
1182 seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
1183}
1184#endif
1185
1186/* -----------------------------------------------------------------------------
1187 * Constructor & Destructor
1188 */
1189
1190static void omap_gem_free_object(struct drm_gem_object *obj)
1191{
1192 struct drm_device *dev = obj->dev;
1193 struct omap_drm_private *priv = dev->dev_private;
1194 struct omap_gem_object *omap_obj = to_omap_bo(obj);
1195
1196 omap_gem_evict(obj);
1197
1198 mutex_lock(&priv->list_lock);
1199 list_del(&omap_obj->mm_list);
1200 mutex_unlock(&priv->list_lock);
1201
1202 /*
1203 * We own the sole reference to the object at this point, but to keep
1204 * lockdep happy, we must still take the omap_obj_lock to call
1205 * omap_gem_detach_pages(). This should hardly make any difference as
1206 * there can't be any lock contention.
1207 */
1208 mutex_lock(&omap_obj->lock);
1209
1210 /* The object should not be pinned. */
1211 WARN_ON(refcount_read(&omap_obj->pin_cnt) > 0);
1212
1213 if (omap_obj->pages) {
1214 if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
1215 kfree(omap_obj->pages);
1216 else
1217 omap_gem_detach_pages(obj);
1218 }
1219
1220 if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
1221 dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
1222 omap_obj->dma_addr);
1223 } else if (omap_obj->vaddr) {
1224 vunmap(omap_obj->vaddr);
1225 } else if (obj->import_attach) {
1226 drm_prime_gem_destroy(obj, omap_obj->sgt);
1227 }
1228
1229 mutex_unlock(&omap_obj->lock);
1230
1231 drm_gem_object_release(obj);
1232
1233 mutex_destroy(&omap_obj->lock);
1234
1235 kfree(omap_obj);
1236}
1237
1238static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
1239{
1240 struct omap_drm_private *priv = dev->dev_private;
1241
1242 switch (flags & OMAP_BO_CACHE_MASK) {
1243 case OMAP_BO_CACHED:
1244 case OMAP_BO_WC:
1245 case OMAP_BO_CACHE_MASK:
1246 break;
1247
1248 default:
1249 return false;
1250 }
1251
1252 if (flags & OMAP_BO_TILED_MASK) {
1253 if (!priv->usergart)
1254 return false;
1255
1256 switch (flags & OMAP_BO_TILED_MASK) {
1257 case OMAP_BO_TILED_8:
1258 case OMAP_BO_TILED_16:
1259 case OMAP_BO_TILED_32:
1260 break;
1261
1262 default:
1263 return false;
1264 }
1265 }
1266
1267 return true;
1268}
1269
1270static const struct vm_operations_struct omap_gem_vm_ops = {
1271 .fault = omap_gem_fault,
1272 .open = drm_gem_vm_open,
1273 .close = drm_gem_vm_close,
1274};
1275
1276static const struct drm_gem_object_funcs omap_gem_object_funcs = {
1277 .free = omap_gem_free_object,
1278 .export = omap_gem_prime_export,
1279 .mmap = omap_gem_object_mmap,
1280 .vm_ops = &omap_gem_vm_ops,
1281};
1282
1283/* GEM buffer object constructor */
1284struct drm_gem_object *omap_gem_new(struct drm_device *dev,
1285 union omap_gem_size gsize, u32 flags)
1286{
1287 struct omap_drm_private *priv = dev->dev_private;
1288 struct omap_gem_object *omap_obj;
1289 struct drm_gem_object *obj;
1290 struct address_space *mapping;
1291 size_t size;
1292 int ret;
1293
1294 if (!omap_gem_validate_flags(dev, flags))
1295 return NULL;
1296
1297 /* Validate the flags and compute the memory and cache flags. */
1298 if (flags & OMAP_BO_TILED_MASK) {
1299 /*
1300 * Tiled buffers are always shmem paged backed. When they are
1301 * scanned out, they are remapped into DMM/TILER.
1302 */
1303 flags |= OMAP_BO_MEM_SHMEM;
1304
1305 /*
1306 * Currently don't allow cached buffers. There is some caching
1307 * stuff that needs to be handled better.
1308 */
1309 flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
1310 flags |= tiler_get_cpu_cache_flags();
1311 } else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
1312 /*
1313 * If we don't have DMM, we must allocate scanout buffers
1314 * from contiguous DMA memory.
1315 */
1316 flags |= OMAP_BO_MEM_DMA_API;
1317 } else if (!(flags & OMAP_BO_MEM_DMABUF)) {
1318 /*
1319 * All other buffers not backed by dma_buf are shmem-backed.
1320 */
1321 flags |= OMAP_BO_MEM_SHMEM;
1322 }
1323
1324 /* Allocate the initialize the OMAP GEM object. */
1325 omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
1326 if (!omap_obj)
1327 return NULL;
1328
1329 obj = &omap_obj->base;
1330 omap_obj->flags = flags;
1331 mutex_init(&omap_obj->lock);
1332
1333 if (flags & OMAP_BO_TILED_MASK) {
1334 /*
1335 * For tiled buffers align dimensions to slot boundaries and
1336 * calculate size based on aligned dimensions.
1337 */
1338 tiler_align(gem2fmt(flags), &gsize.tiled.width,
1339 &gsize.tiled.height);
1340
1341 size = tiler_size(gem2fmt(flags), gsize.tiled.width,
1342 gsize.tiled.height);
1343
1344 omap_obj->width = gsize.tiled.width;
1345 omap_obj->height = gsize.tiled.height;
1346 } else {
1347 size = PAGE_ALIGN(gsize.bytes);
1348 }
1349
1350 obj->funcs = &omap_gem_object_funcs;
1351
1352 /* Initialize the GEM object. */
1353 if (!(flags & OMAP_BO_MEM_SHMEM)) {
1354 drm_gem_private_object_init(dev, obj, size);
1355 } else {
1356 ret = drm_gem_object_init(dev, obj, size);
1357 if (ret)
1358 goto err_free;
1359
1360 mapping = obj->filp->f_mapping;
1361 mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
1362 }
1363
1364 /* Allocate memory if needed. */
1365 if (flags & OMAP_BO_MEM_DMA_API) {
1366 omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
1367 &omap_obj->dma_addr,
1368 GFP_KERNEL);
1369 if (!omap_obj->vaddr)
1370 goto err_release;
1371 }
1372
1373 mutex_lock(&priv->list_lock);
1374 list_add(&omap_obj->mm_list, &priv->obj_list);
1375 mutex_unlock(&priv->list_lock);
1376
1377 return obj;
1378
1379err_release:
1380 drm_gem_object_release(obj);
1381err_free:
1382 kfree(omap_obj);
1383 return NULL;
1384}
1385
1386struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
1387 struct sg_table *sgt)
1388{
1389 struct omap_drm_private *priv = dev->dev_private;
1390 struct omap_gem_object *omap_obj;
1391 struct drm_gem_object *obj;
1392 union omap_gem_size gsize;
1393
1394 /* Without a DMM only physically contiguous buffers can be supported. */
1395 if (!omap_gem_sgt_is_contiguous(sgt, size) && !priv->has_dmm)
1396 return ERR_PTR(-EINVAL);
1397
1398 gsize.bytes = PAGE_ALIGN(size);
1399 obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
1400 if (!obj)
1401 return ERR_PTR(-ENOMEM);
1402
1403 omap_obj = to_omap_bo(obj);
1404
1405 omap_obj->sgt = sgt;
1406
1407 if (omap_gem_sgt_is_contiguous(sgt, size)) {
1408 omap_obj->dma_addr = sg_dma_address(sgt->sgl);
1409 } else {
1410 /* Create pages list from sgt */
1411 struct page **pages;
1412 unsigned int npages;
1413 unsigned int ret;
1414
1415 npages = DIV_ROUND_UP(size, PAGE_SIZE);
1416 pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
1417 if (!pages) {
1418 omap_gem_free_object(obj);
1419 return ERR_PTR(-ENOMEM);
1420 }
1421
1422 omap_obj->pages = pages;
1423 ret = drm_prime_sg_to_page_array(sgt, pages, npages);
1424 if (ret) {
1425 omap_gem_free_object(obj);
1426 return ERR_PTR(-ENOMEM);
1427 }
1428 }
1429
1430 return obj;
1431}
1432
1433/* convenience method to construct a GEM buffer object, and userspace handle */
1434int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
1435 union omap_gem_size gsize, u32 flags, u32 *handle)
1436{
1437 struct drm_gem_object *obj;
1438 int ret;
1439
1440 obj = omap_gem_new(dev, gsize, flags);
1441 if (!obj)
1442 return -ENOMEM;
1443
1444 ret = drm_gem_handle_create(file, obj, handle);
1445 if (ret) {
1446 omap_gem_free_object(obj);
1447 return ret;
1448 }
1449
1450 /* drop reference from allocate - handle holds it now */
1451 drm_gem_object_put(obj);
1452
1453 return 0;
1454}
1455
1456/* -----------------------------------------------------------------------------
1457 * Init & Cleanup
1458 */
1459
1460/* If DMM is used, we need to set some stuff up.. */
1461void omap_gem_init(struct drm_device *dev)
1462{
1463 struct omap_drm_private *priv = dev->dev_private;
1464 struct omap_drm_usergart *usergart;
1465 const enum tiler_fmt fmts[] = {
1466 TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
1467 };
1468 int i, j;
1469
1470 if (!dmm_is_available()) {
1471 /* DMM only supported on OMAP4 and later, so this isn't fatal */
1472 dev_warn(dev->dev, "DMM not available, disable DMM support\n");
1473 return;
1474 }
1475
1476 usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
1477 if (!usergart)
1478 return;
1479
1480 /* reserve 4k aligned/wide regions for userspace mappings: */
1481 for (i = 0; i < ARRAY_SIZE(fmts); i++) {
1482 u16 h = 1, w = PAGE_SIZE >> i;
1483
1484 tiler_align(fmts[i], &w, &h);
1485 /* note: since each region is 1 4kb page wide, and minimum
1486 * number of rows, the height ends up being the same as the
1487 * # of pages in the region
1488 */
1489 usergart[i].height = h;
1490 usergart[i].height_shift = ilog2(h);
1491 usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
1492 usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
1493 for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
1494 struct omap_drm_usergart_entry *entry;
1495 struct tiler_block *block;
1496
1497 entry = &usergart[i].entry[j];
1498 block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
1499 if (IS_ERR(block)) {
1500 dev_err(dev->dev,
1501 "reserve failed: %d, %d, %ld\n",
1502 i, j, PTR_ERR(block));
1503 return;
1504 }
1505 entry->dma_addr = tiler_ssptr(block);
1506 entry->block = block;
1507
1508 DBG("%d:%d: %dx%d: dma_addr=%pad stride=%d", i, j, w, h,
1509 &entry->dma_addr,
1510 usergart[i].stride_pfn << PAGE_SHIFT);
1511 }
1512 }
1513
1514 priv->usergart = usergart;
1515 priv->has_dmm = true;
1516}
1517
1518void omap_gem_deinit(struct drm_device *dev)
1519{
1520 struct omap_drm_private *priv = dev->dev_private;
1521
1522 /* I believe we can rely on there being no more outstanding GEM
1523 * objects which could depend on usergart/dmm at this point.
1524 */
1525 kfree(priv->usergart);
1526}