1/*
  2 * Copyright 2016 Advanced Micro Devices, Inc.
  3 *
  4 * Permission is hereby granted, free of charge, to any person obtaining a
  5 * copy of this software and associated documentation files (the "Software"),
  6 * to deal in the Software without restriction, including without limitation
  7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8 * and/or sell copies of the Software, and to permit persons to whom the
  9 * Software is furnished to do so, subject to the following conditions:
 10 *
 11 * The above copyright notice and this permission notice shall be included in
 12 * all copies or substantial portions of the Software.
 13 *
 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 20 * OTHER DEALINGS IN THE SOFTWARE.
 21 *
 22 * Authors: Christian König
 23 */
 24
 25#include <linux/dma-mapping.h>
 26#include <drm/ttm/ttm_range_manager.h>
 27
 28#include "amdgpu.h"
 29#include "amdgpu_vm.h"
 30#include "amdgpu_res_cursor.h"
 31#include "amdgpu_atomfirmware.h"
 32#include "atom.h"
 33
 34struct amdgpu_vram_reservation {
 35	u64 start;
 36	u64 size;
 37	struct list_head allocated;
 38	struct list_head blocks;
 39};
 40
 41static inline struct amdgpu_vram_mgr *
 42to_vram_mgr(struct ttm_resource_manager *man)
 43{
 44	return container_of(man, struct amdgpu_vram_mgr, manager);
 45}
 46
 47static inline struct amdgpu_device *
 48to_amdgpu_device(struct amdgpu_vram_mgr *mgr)
 49{
 50	return container_of(mgr, struct amdgpu_device, mman.vram_mgr);
 51}
 52
 53static inline struct drm_buddy_block *
 54amdgpu_vram_mgr_first_block(struct list_head *list)
 55{
 56	return list_first_entry_or_null(list, struct drm_buddy_block, link);
 57}
 58
 59static inline bool amdgpu_is_vram_mgr_blocks_contiguous(struct list_head *head)
 60{
 61	struct drm_buddy_block *block;
 62	u64 start, size;
 63
 64	block = amdgpu_vram_mgr_first_block(head);
 65	if (!block)
 66		return false;
 67
 68	while (head != block->link.next) {
 69		start = amdgpu_vram_mgr_block_start(block);
 70		size = amdgpu_vram_mgr_block_size(block);
 71
 72		block = list_entry(block->link.next, struct drm_buddy_block, link);
 73		if (start + size != amdgpu_vram_mgr_block_start(block))
 74			return false;
 75	}
 76
 77	return true;
 78}
 79
 80static inline u64 amdgpu_vram_mgr_blocks_size(struct list_head *head)
 81{
 82	struct drm_buddy_block *block;
 83	u64 size = 0;
 84
 85	list_for_each_entry(block, head, link)
 86		size += amdgpu_vram_mgr_block_size(block);
 87
 88	return size;
 89}
 90
 91/**
 92 * DOC: mem_info_vram_total
 93 *
 94 * The amdgpu driver provides a sysfs API for reporting current total VRAM
 95 * available on the device
 96 * The file mem_info_vram_total is used for this and returns the total
 97 * amount of VRAM in bytes
 98 */
 99static ssize_t amdgpu_mem_info_vram_total_show(struct device *dev,
100		struct device_attribute *attr, char *buf)
101{
102	struct drm_device *ddev = dev_get_drvdata(dev);
103	struct amdgpu_device *adev = drm_to_adev(ddev);
104
105	return sysfs_emit(buf, "%llu\n", adev->gmc.real_vram_size);
106}
107
108/**
109 * DOC: mem_info_vis_vram_total
110 *
111 * The amdgpu driver provides a sysfs API for reporting current total
112 * visible VRAM available on the device
113 * The file mem_info_vis_vram_total is used for this and returns the total
114 * amount of visible VRAM in bytes
115 */
116static ssize_t amdgpu_mem_info_vis_vram_total_show(struct device *dev,
117		struct device_attribute *attr, char *buf)
118{
119	struct drm_device *ddev = dev_get_drvdata(dev);
120	struct amdgpu_device *adev = drm_to_adev(ddev);
121
122	return sysfs_emit(buf, "%llu\n", adev->gmc.visible_vram_size);
123}
124
125/**
126 * DOC: mem_info_vram_used
127 *
128 * The amdgpu driver provides a sysfs API for reporting current total VRAM
129 * available on the device
130 * The file mem_info_vram_used is used for this and returns the total
131 * amount of currently used VRAM in bytes
132 */
133static ssize_t amdgpu_mem_info_vram_used_show(struct device *dev,
134					      struct device_attribute *attr,
135					      char *buf)
136{
137	struct drm_device *ddev = dev_get_drvdata(dev);
138	struct amdgpu_device *adev = drm_to_adev(ddev);
139	struct ttm_resource_manager *man = &adev->mman.vram_mgr.manager;
140
141	return sysfs_emit(buf, "%llu\n", ttm_resource_manager_usage(man));
142}
143
144/**
145 * DOC: mem_info_vis_vram_used
146 *
147 * The amdgpu driver provides a sysfs API for reporting current total of
148 * used visible VRAM
149 * The file mem_info_vis_vram_used is used for this and returns the total
150 * amount of currently used visible VRAM in bytes
151 */
152static ssize_t amdgpu_mem_info_vis_vram_used_show(struct device *dev,
153						  struct device_attribute *attr,
154						  char *buf)
155{
156	struct drm_device *ddev = dev_get_drvdata(dev);
157	struct amdgpu_device *adev = drm_to_adev(ddev);
158
159	return sysfs_emit(buf, "%llu\n",
160			  amdgpu_vram_mgr_vis_usage(&adev->mman.vram_mgr));
161}
162
163/**
164 * DOC: mem_info_vram_vendor
165 *
166 * The amdgpu driver provides a sysfs API for reporting the vendor of the
167 * installed VRAM
168 * The file mem_info_vram_vendor is used for this and returns the name of the
169 * vendor.
170 */
171static ssize_t amdgpu_mem_info_vram_vendor(struct device *dev,
172					   struct device_attribute *attr,
173					   char *buf)
174{
175	struct drm_device *ddev = dev_get_drvdata(dev);
176	struct amdgpu_device *adev = drm_to_adev(ddev);
177
178	switch (adev->gmc.vram_vendor) {
179	case SAMSUNG:
180		return sysfs_emit(buf, "samsung\n");
181	case INFINEON:
182		return sysfs_emit(buf, "infineon\n");
183	case ELPIDA:
184		return sysfs_emit(buf, "elpida\n");
185	case ETRON:
186		return sysfs_emit(buf, "etron\n");
187	case NANYA:
188		return sysfs_emit(buf, "nanya\n");
189	case HYNIX:
190		return sysfs_emit(buf, "hynix\n");
191	case MOSEL:
192		return sysfs_emit(buf, "mosel\n");
193	case WINBOND:
194		return sysfs_emit(buf, "winbond\n");
195	case ESMT:
196		return sysfs_emit(buf, "esmt\n");
197	case MICRON:
198		return sysfs_emit(buf, "micron\n");
199	default:
200		return sysfs_emit(buf, "unknown\n");
201	}
202}
203
204static DEVICE_ATTR(mem_info_vram_total, S_IRUGO,
205		   amdgpu_mem_info_vram_total_show, NULL);
206static DEVICE_ATTR(mem_info_vis_vram_total, S_IRUGO,
207		   amdgpu_mem_info_vis_vram_total_show,NULL);
208static DEVICE_ATTR(mem_info_vram_used, S_IRUGO,
209		   amdgpu_mem_info_vram_used_show, NULL);
210static DEVICE_ATTR(mem_info_vis_vram_used, S_IRUGO,
211		   amdgpu_mem_info_vis_vram_used_show, NULL);
212static DEVICE_ATTR(mem_info_vram_vendor, S_IRUGO,
213		   amdgpu_mem_info_vram_vendor, NULL);
214
215static struct attribute *amdgpu_vram_mgr_attributes[] = {
216	&dev_attr_mem_info_vram_total.attr,
217	&dev_attr_mem_info_vis_vram_total.attr,
218	&dev_attr_mem_info_vram_used.attr,
219	&dev_attr_mem_info_vis_vram_used.attr,
220	&dev_attr_mem_info_vram_vendor.attr,
221	NULL
222};
223
224static umode_t amdgpu_vram_attrs_is_visible(struct kobject *kobj,
225					    struct attribute *attr, int i)
226{
227	struct device *dev = kobj_to_dev(kobj);
228	struct drm_device *ddev = dev_get_drvdata(dev);
229	struct amdgpu_device *adev = drm_to_adev(ddev);
230
231	if (attr == &dev_attr_mem_info_vram_vendor.attr &&
232	    !adev->gmc.vram_vendor)
233		return 0;
234
235	return attr->mode;
236}
237
238const struct attribute_group amdgpu_vram_mgr_attr_group = {
239	.attrs = amdgpu_vram_mgr_attributes,
240	.is_visible = amdgpu_vram_attrs_is_visible
241};
242
243/**
244 * amdgpu_vram_mgr_vis_size - Calculate visible block size
245 *
246 * @adev: amdgpu_device pointer
247 * @block: DRM BUDDY block structure
248 *
249 * Calculate how many bytes of the DRM BUDDY block are inside visible VRAM
250 */
251static u64 amdgpu_vram_mgr_vis_size(struct amdgpu_device *adev,
252				    struct drm_buddy_block *block)
253{
254	u64 start = amdgpu_vram_mgr_block_start(block);
255	u64 end = start + amdgpu_vram_mgr_block_size(block);
256
257	if (start >= adev->gmc.visible_vram_size)
258		return 0;
259
260	return (end > adev->gmc.visible_vram_size ?
261		adev->gmc.visible_vram_size : end) - start;
262}
263
264/**
265 * amdgpu_vram_mgr_bo_visible_size - CPU visible BO size
266 *
267 * @bo: &amdgpu_bo buffer object (must be in VRAM)
268 *
269 * Returns:
270 * How much of the given &amdgpu_bo buffer object lies in CPU visible VRAM.
271 */
272u64 amdgpu_vram_mgr_bo_visible_size(struct amdgpu_bo *bo)
273{
274	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
275	struct ttm_resource *res = bo->tbo.resource;
276	struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
277	struct drm_buddy_block *block;
278	u64 usage = 0;
279
280	if (amdgpu_gmc_vram_full_visible(&adev->gmc))
281		return amdgpu_bo_size(bo);
282
283	if (res->start >= adev->gmc.visible_vram_size >> PAGE_SHIFT)
284		return 0;
285
286	list_for_each_entry(block, &vres->blocks, link)
287		usage += amdgpu_vram_mgr_vis_size(adev, block);
288
289	return usage;
290}
291
292/* Commit the reservation of VRAM pages */
293static void amdgpu_vram_mgr_do_reserve(struct ttm_resource_manager *man)
294{
295	struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
296	struct amdgpu_device *adev = to_amdgpu_device(mgr);
297	struct drm_buddy *mm = &mgr->mm;
298	struct amdgpu_vram_reservation *rsv, *temp;
299	struct drm_buddy_block *block;
300	uint64_t vis_usage;
301
302	list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks) {
303		if (drm_buddy_alloc_blocks(mm, rsv->start, rsv->start + rsv->size,
304					   rsv->size, mm->chunk_size, &rsv->allocated,
305					   DRM_BUDDY_RANGE_ALLOCATION))
306			continue;
307
308		block = amdgpu_vram_mgr_first_block(&rsv->allocated);
309		if (!block)
310			continue;
311
312		dev_dbg(adev->dev, "Reservation 0x%llx - %lld, Succeeded\n",
313			rsv->start, rsv->size);
314
315		vis_usage = amdgpu_vram_mgr_vis_size(adev, block);
316		atomic64_add(vis_usage, &mgr->vis_usage);
317		spin_lock(&man->bdev->lru_lock);
318		man->usage += rsv->size;
319		spin_unlock(&man->bdev->lru_lock);
320		list_move(&rsv->blocks, &mgr->reserved_pages);
321	}
322}
323
324/**
325 * amdgpu_vram_mgr_reserve_range - Reserve a range from VRAM
326 *
327 * @mgr: amdgpu_vram_mgr pointer
328 * @start: start address of the range in VRAM
329 * @size: size of the range
330 *
331 * Reserve memory from start address with the specified size in VRAM
332 */
333int amdgpu_vram_mgr_reserve_range(struct amdgpu_vram_mgr *mgr,
334				  uint64_t start, uint64_t size)
335{
336	struct amdgpu_vram_reservation *rsv;
337
338	rsv = kzalloc(sizeof(*rsv), GFP_KERNEL);
339	if (!rsv)
340		return -ENOMEM;
341
342	INIT_LIST_HEAD(&rsv->allocated);
343	INIT_LIST_HEAD(&rsv->blocks);
344
345	rsv->start = start;
346	rsv->size = size;
347
348	mutex_lock(&mgr->lock);
349	list_add_tail(&rsv->blocks, &mgr->reservations_pending);
350	amdgpu_vram_mgr_do_reserve(&mgr->manager);
351	mutex_unlock(&mgr->lock);
352
353	return 0;
354}
355
356/**
357 * amdgpu_vram_mgr_query_page_status - query the reservation status
358 *
359 * @mgr: amdgpu_vram_mgr pointer
360 * @start: start address of a page in VRAM
361 *
362 * Returns:
363 *	-EBUSY: the page is still hold and in pending list
364 *	0: the page has been reserved
365 *	-ENOENT: the input page is not a reservation
366 */
367int amdgpu_vram_mgr_query_page_status(struct amdgpu_vram_mgr *mgr,
368				      uint64_t start)
369{
370	struct amdgpu_vram_reservation *rsv;
371	int ret;
372
373	mutex_lock(&mgr->lock);
374
375	list_for_each_entry(rsv, &mgr->reservations_pending, blocks) {
376		if (rsv->start <= start &&
377		    (start < (rsv->start + rsv->size))) {
378			ret = -EBUSY;
379			goto out;
380		}
381	}
382
383	list_for_each_entry(rsv, &mgr->reserved_pages, blocks) {
384		if (rsv->start <= start &&
385		    (start < (rsv->start + rsv->size))) {
386			ret = 0;
387			goto out;
388		}
389	}
390
391	ret = -ENOENT;
392out:
393	mutex_unlock(&mgr->lock);
394	return ret;
395}
396
397static void amdgpu_dummy_vram_mgr_debug(struct ttm_resource_manager *man,
398				  struct drm_printer *printer)
399{
400	DRM_DEBUG_DRIVER("Dummy vram mgr debug\n");
401}
402
403static bool amdgpu_dummy_vram_mgr_compatible(struct ttm_resource_manager *man,
404				       struct ttm_resource *res,
405				       const struct ttm_place *place,
406				       size_t size)
407{
408	DRM_DEBUG_DRIVER("Dummy vram mgr compatible\n");
409	return false;
410}
411
412static bool amdgpu_dummy_vram_mgr_intersects(struct ttm_resource_manager *man,
413				       struct ttm_resource *res,
414				       const struct ttm_place *place,
415				       size_t size)
416{
417	DRM_DEBUG_DRIVER("Dummy vram mgr intersects\n");
418	return true;
419}
420
421static void amdgpu_dummy_vram_mgr_del(struct ttm_resource_manager *man,
422				struct ttm_resource *res)
423{
424	DRM_DEBUG_DRIVER("Dummy vram mgr deleted\n");
425}
426
427static int amdgpu_dummy_vram_mgr_new(struct ttm_resource_manager *man,
428			       struct ttm_buffer_object *tbo,
429			       const struct ttm_place *place,
430			       struct ttm_resource **res)
431{
432	DRM_DEBUG_DRIVER("Dummy vram mgr new\n");
433	return -ENOSPC;
434}
435
436/**
437 * amdgpu_vram_mgr_new - allocate new ranges
438 *
439 * @man: TTM memory type manager
440 * @tbo: TTM BO we need this range for
441 * @place: placement flags and restrictions
442 * @res: the resulting mem object
443 *
444 * Allocate VRAM for the given BO.
445 */
446static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
447			       struct ttm_buffer_object *tbo,
448			       const struct ttm_place *place,
449			       struct ttm_resource **res)
450{
451	struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
452	struct amdgpu_device *adev = to_amdgpu_device(mgr);
453	u64 vis_usage = 0, max_bytes, min_block_size;
454	struct amdgpu_vram_mgr_resource *vres;
455	u64 size, remaining_size, lpfn, fpfn;
456	struct drm_buddy *mm = &mgr->mm;
457	struct drm_buddy_block *block;
458	unsigned long pages_per_block;
459	int r;
460
461	lpfn = (u64)place->lpfn << PAGE_SHIFT;
462	if (!lpfn)
463		lpfn = man->size;
464
465	fpfn = (u64)place->fpfn << PAGE_SHIFT;
466
467	max_bytes = adev->gmc.mc_vram_size;
468	if (tbo->type != ttm_bo_type_kernel)
469		max_bytes -= AMDGPU_VM_RESERVED_VRAM;
470
471	if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
472		pages_per_block = ~0ul;
473	} else {
474#ifdef CONFIG_TRANSPARENT_HUGEPAGE
475		pages_per_block = HPAGE_PMD_NR;
476#else
477		/* default to 2MB */
478		pages_per_block = 2UL << (20UL - PAGE_SHIFT);
479#endif
480		pages_per_block = max_t(uint32_t, pages_per_block,
481					tbo->page_alignment);
482	}
483
484	vres = kzalloc(sizeof(*vres), GFP_KERNEL);
485	if (!vres)
486		return -ENOMEM;
487
488	ttm_resource_init(tbo, place, &vres->base);
489
490	/* bail out quickly if there's likely not enough VRAM for this BO */
491	if (ttm_resource_manager_usage(man) > max_bytes) {
492		r = -ENOSPC;
493		goto error_fini;
494	}
495
496	INIT_LIST_HEAD(&vres->blocks);
497
498	if (place->flags & TTM_PL_FLAG_TOPDOWN)
499		vres->flags |= DRM_BUDDY_TOPDOWN_ALLOCATION;
500
501	if (place->flags & TTM_PL_FLAG_CONTIGUOUS)
502		vres->flags |= DRM_BUDDY_CONTIGUOUS_ALLOCATION;
503
504	if (fpfn || lpfn != mgr->mm.size)
505		/* Allocate blocks in desired range */
506		vres->flags |= DRM_BUDDY_RANGE_ALLOCATION;
507
508	remaining_size = (u64)vres->base.size;
509
510	mutex_lock(&mgr->lock);
511	while (remaining_size) {
512		if (tbo->page_alignment)
513			min_block_size = (u64)tbo->page_alignment << PAGE_SHIFT;
514		else
515			min_block_size = mgr->default_page_size;
516
517		BUG_ON(min_block_size < mm->chunk_size);
518
519		/* Limit maximum size to 2GiB due to SG table limitations */
520		size = min(remaining_size, 2ULL << 30);
521
522		if ((size >= (u64)pages_per_block << PAGE_SHIFT) &&
523				!(size & (((u64)pages_per_block << PAGE_SHIFT) - 1)))
524			min_block_size = (u64)pages_per_block << PAGE_SHIFT;
525
526		r = drm_buddy_alloc_blocks(mm, fpfn,
527					   lpfn,
528					   size,
529					   min_block_size,
530					   &vres->blocks,
531					   vres->flags);
532		if (unlikely(r))
533			goto error_free_blocks;
534
535		if (size > remaining_size)
536			remaining_size = 0;
537		else
538			remaining_size -= size;
539	}
540	mutex_unlock(&mgr->lock);
541
542	vres->base.start = 0;
543	size = max_t(u64, amdgpu_vram_mgr_blocks_size(&vres->blocks),
544		     vres->base.size);
545	list_for_each_entry(block, &vres->blocks, link) {
546		unsigned long start;
547
548		start = amdgpu_vram_mgr_block_start(block) +
549			amdgpu_vram_mgr_block_size(block);
550		start >>= PAGE_SHIFT;
551
552		if (start > PFN_UP(size))
553			start -= PFN_UP(size);
554		else
555			start = 0;
556		vres->base.start = max(vres->base.start, start);
557
558		vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
559	}
560
561	if (amdgpu_is_vram_mgr_blocks_contiguous(&vres->blocks))
562		vres->base.placement |= TTM_PL_FLAG_CONTIGUOUS;
563
564	if (adev->gmc.xgmi.connected_to_cpu)
565		vres->base.bus.caching = ttm_cached;
566	else
567		vres->base.bus.caching = ttm_write_combined;
568
569	atomic64_add(vis_usage, &mgr->vis_usage);
570	*res = &vres->base;
571	return 0;
572
573error_free_blocks:
574	drm_buddy_free_list(mm, &vres->blocks);
575	mutex_unlock(&mgr->lock);
576error_fini:
577	ttm_resource_fini(man, &vres->base);
578	kfree(vres);
579
580	return r;
581}
582
583/**
584 * amdgpu_vram_mgr_del - free ranges
585 *
586 * @man: TTM memory type manager
587 * @res: TTM memory object
588 *
589 * Free the allocated VRAM again.
590 */
591static void amdgpu_vram_mgr_del(struct ttm_resource_manager *man,
592				struct ttm_resource *res)
593{
594	struct amdgpu_vram_mgr_resource *vres = to_amdgpu_vram_mgr_resource(res);
595	struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
596	struct amdgpu_device *adev = to_amdgpu_device(mgr);
597	struct drm_buddy *mm = &mgr->mm;
598	struct drm_buddy_block *block;
599	uint64_t vis_usage = 0;
600
601	mutex_lock(&mgr->lock);
602	list_for_each_entry(block, &vres->blocks, link)
603		vis_usage += amdgpu_vram_mgr_vis_size(adev, block);
604
605	amdgpu_vram_mgr_do_reserve(man);
606
607	drm_buddy_free_list(mm, &vres->blocks);
608	mutex_unlock(&mgr->lock);
609
610	atomic64_sub(vis_usage, &mgr->vis_usage);
611
612	ttm_resource_fini(man, res);
613	kfree(vres);
614}
615
616/**
617 * amdgpu_vram_mgr_alloc_sgt - allocate and fill a sg table
618 *
619 * @adev: amdgpu device pointer
620 * @res: TTM memory object
621 * @offset: byte offset from the base of VRAM BO
622 * @length: number of bytes to export in sg_table
623 * @dev: the other device
624 * @dir: dma direction
625 * @sgt: resulting sg table
626 *
627 * Allocate and fill a sg table from a VRAM allocation.
628 */
629int amdgpu_vram_mgr_alloc_sgt(struct amdgpu_device *adev,
630			      struct ttm_resource *res,
631			      u64 offset, u64 length,
632			      struct device *dev,
633			      enum dma_data_direction dir,
634			      struct sg_table **sgt)
635{
636	struct amdgpu_res_cursor cursor;
637	struct scatterlist *sg;
638	int num_entries = 0;
639	int i, r;
640
641	*sgt = kmalloc(sizeof(**sgt), GFP_KERNEL);
642	if (!*sgt)
643		return -ENOMEM;
644
645	/* Determine the number of DRM_BUDDY blocks to export */
646	amdgpu_res_first(res, offset, length, &cursor);
647	while (cursor.remaining) {
648		num_entries++;
649		amdgpu_res_next(&cursor, cursor.size);
650	}
651
652	r = sg_alloc_table(*sgt, num_entries, GFP_KERNEL);
653	if (r)
654		goto error_free;
655
656	/* Initialize scatterlist nodes of sg_table */
657	for_each_sgtable_sg((*sgt), sg, i)
658		sg->length = 0;
659
660	/*
661	 * Walk down DRM_BUDDY blocks to populate scatterlist nodes
662	 * @note: Use iterator api to get first the DRM_BUDDY block
663	 * and the number of bytes from it. Access the following
664	 * DRM_BUDDY block(s) if more buffer needs to exported
665	 */
666	amdgpu_res_first(res, offset, length, &cursor);
667	for_each_sgtable_sg((*sgt), sg, i) {
668		phys_addr_t phys = cursor.start + adev->gmc.aper_base;
669		size_t size = cursor.size;
670		dma_addr_t addr;
671
672		addr = dma_map_resource(dev, phys, size, dir,
673					DMA_ATTR_SKIP_CPU_SYNC);
674		r = dma_mapping_error(dev, addr);
675		if (r)
676			goto error_unmap;
677
678		sg_set_page(sg, NULL, size, 0);
679		sg_dma_address(sg) = addr;
680		sg_dma_len(sg) = size;
681
682		amdgpu_res_next(&cursor, cursor.size);
683	}
684
685	return 0;
686
687error_unmap:
688	for_each_sgtable_sg((*sgt), sg, i) {
689		if (!sg->length)
690			continue;
691
692		dma_unmap_resource(dev, sg->dma_address,
693				   sg->length, dir,
694				   DMA_ATTR_SKIP_CPU_SYNC);
695	}
696	sg_free_table(*sgt);
697
698error_free:
699	kfree(*sgt);
700	return r;
701}
702
703/**
704 * amdgpu_vram_mgr_free_sgt - allocate and fill a sg table
705 *
706 * @dev: device pointer
707 * @dir: data direction of resource to unmap
708 * @sgt: sg table to free
709 *
710 * Free a previously allocate sg table.
711 */
712void amdgpu_vram_mgr_free_sgt(struct device *dev,
713			      enum dma_data_direction dir,
714			      struct sg_table *sgt)
715{
716	struct scatterlist *sg;
717	int i;
718
719	for_each_sgtable_sg(sgt, sg, i)
720		dma_unmap_resource(dev, sg->dma_address,
721				   sg->length, dir,
722				   DMA_ATTR_SKIP_CPU_SYNC);
723	sg_free_table(sgt);
724	kfree(sgt);
725}
726
727/**
728 * amdgpu_vram_mgr_vis_usage - how many bytes are used in the visible part
729 *
730 * @mgr: amdgpu_vram_mgr pointer
731 *
732 * Returns how many bytes are used in the visible part of VRAM
733 */
734uint64_t amdgpu_vram_mgr_vis_usage(struct amdgpu_vram_mgr *mgr)
735{
736	return atomic64_read(&mgr->vis_usage);
737}
738
739/**
740 * amdgpu_vram_mgr_intersects - test each drm buddy block for intersection
741 *
742 * @man: TTM memory type manager
743 * @res: The resource to test
744 * @place: The place to test against
745 * @size: Size of the new allocation
746 *
747 * Test each drm buddy block for intersection for eviction decision.
748 */
749static bool amdgpu_vram_mgr_intersects(struct ttm_resource_manager *man,
750				       struct ttm_resource *res,
751				       const struct ttm_place *place,
752				       size_t size)
753{
754	struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
755	struct drm_buddy_block *block;
756
757	/* Check each drm buddy block individually */
758	list_for_each_entry(block, &mgr->blocks, link) {
759		unsigned long fpfn =
760			amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
761		unsigned long lpfn = fpfn +
762			(amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
763
764		if (place->fpfn < lpfn &&
765		    (!place->lpfn || place->lpfn > fpfn))
766			return true;
767	}
768
769	return false;
770}
771
772/**
773 * amdgpu_vram_mgr_compatible - test each drm buddy block for compatibility
774 *
775 * @man: TTM memory type manager
776 * @res: The resource to test
777 * @place: The place to test against
778 * @size: Size of the new allocation
779 *
780 * Test each drm buddy block for placement compatibility.
781 */
782static bool amdgpu_vram_mgr_compatible(struct ttm_resource_manager *man,
783				       struct ttm_resource *res,
784				       const struct ttm_place *place,
785				       size_t size)
786{
787	struct amdgpu_vram_mgr_resource *mgr = to_amdgpu_vram_mgr_resource(res);
788	struct drm_buddy_block *block;
789
790	/* Check each drm buddy block individually */
791	list_for_each_entry(block, &mgr->blocks, link) {
792		unsigned long fpfn =
793			amdgpu_vram_mgr_block_start(block) >> PAGE_SHIFT;
794		unsigned long lpfn = fpfn +
795			(amdgpu_vram_mgr_block_size(block) >> PAGE_SHIFT);
796
797		if (fpfn < place->fpfn ||
798		    (place->lpfn && lpfn > place->lpfn))
799			return false;
800	}
801
802	return true;
803}
804
805/**
806 * amdgpu_vram_mgr_debug - dump VRAM table
807 *
808 * @man: TTM memory type manager
809 * @printer: DRM printer to use
810 *
811 * Dump the table content using printk.
812 */
813static void amdgpu_vram_mgr_debug(struct ttm_resource_manager *man,
814				  struct drm_printer *printer)
815{
816	struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
817	struct drm_buddy *mm = &mgr->mm;
818	struct amdgpu_vram_reservation *rsv;
819
820	drm_printf(printer, "  vis usage:%llu\n",
821		   amdgpu_vram_mgr_vis_usage(mgr));
822
823	mutex_lock(&mgr->lock);
824	drm_printf(printer, "default_page_size: %lluKiB\n",
825		   mgr->default_page_size >> 10);
826
827	drm_buddy_print(mm, printer);
828
829	drm_printf(printer, "reserved:\n");
830	list_for_each_entry(rsv, &mgr->reserved_pages, blocks)
831		drm_printf(printer, "%#018llx-%#018llx: %llu\n",
832			rsv->start, rsv->start + rsv->size, rsv->size);
833	mutex_unlock(&mgr->lock);
834}
835
836static const struct ttm_resource_manager_func amdgpu_dummy_vram_mgr_func = {
837	.alloc	= amdgpu_dummy_vram_mgr_new,
838	.free	= amdgpu_dummy_vram_mgr_del,
839	.intersects = amdgpu_dummy_vram_mgr_intersects,
840	.compatible = amdgpu_dummy_vram_mgr_compatible,
841	.debug	= amdgpu_dummy_vram_mgr_debug
842};
843
844static const struct ttm_resource_manager_func amdgpu_vram_mgr_func = {
845	.alloc	= amdgpu_vram_mgr_new,
846	.free	= amdgpu_vram_mgr_del,
847	.intersects = amdgpu_vram_mgr_intersects,
848	.compatible = amdgpu_vram_mgr_compatible,
849	.debug	= amdgpu_vram_mgr_debug
850};
851
852/**
853 * amdgpu_vram_mgr_init - init VRAM manager and DRM MM
854 *
855 * @adev: amdgpu_device pointer
856 *
857 * Allocate and initialize the VRAM manager.
858 */
859int amdgpu_vram_mgr_init(struct amdgpu_device *adev)
860{
861	struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
862	struct ttm_resource_manager *man = &mgr->manager;
863	int err;
864
865	ttm_resource_manager_init(man, &adev->mman.bdev,
866				  adev->gmc.real_vram_size);
867
868	mutex_init(&mgr->lock);
869	INIT_LIST_HEAD(&mgr->reservations_pending);
870	INIT_LIST_HEAD(&mgr->reserved_pages);
871	mgr->default_page_size = PAGE_SIZE;
872
873	if (!adev->gmc.is_app_apu) {
874		man->func = &amdgpu_vram_mgr_func;
875
876		err = drm_buddy_init(&mgr->mm, man->size, PAGE_SIZE);
877		if (err)
878			return err;
879	} else {
880		man->func = &amdgpu_dummy_vram_mgr_func;
881		DRM_INFO("Setup dummy vram mgr\n");
882	}
883
884	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, &mgr->manager);
885	ttm_resource_manager_set_used(man, true);
886	return 0;
887}
888
889/**
890 * amdgpu_vram_mgr_fini - free and destroy VRAM manager
891 *
892 * @adev: amdgpu_device pointer
893 *
894 * Destroy and free the VRAM manager, returns -EBUSY if ranges are still
895 * allocated inside it.
896 */
897void amdgpu_vram_mgr_fini(struct amdgpu_device *adev)
898{
899	struct amdgpu_vram_mgr *mgr = &adev->mman.vram_mgr;
900	struct ttm_resource_manager *man = &mgr->manager;
901	int ret;
902	struct amdgpu_vram_reservation *rsv, *temp;
903
904	ttm_resource_manager_set_used(man, false);
905
906	ret = ttm_resource_manager_evict_all(&adev->mman.bdev, man);
907	if (ret)
908		return;
909
910	mutex_lock(&mgr->lock);
911	list_for_each_entry_safe(rsv, temp, &mgr->reservations_pending, blocks)
912		kfree(rsv);
913
914	list_for_each_entry_safe(rsv, temp, &mgr->reserved_pages, blocks) {
915		drm_buddy_free_list(&mgr->mm, &rsv->allocated);
916		kfree(rsv);
917	}
918	if (!adev->gmc.is_app_apu)
919		drm_buddy_fini(&mgr->mm);
920	mutex_unlock(&mgr->lock);
921
922	ttm_resource_manager_cleanup(man);
923	ttm_set_driver_manager(&adev->mman.bdev, TTM_PL_VRAM, NULL);
924}