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