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