summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/armada/armada_gem.c
blob: a293c8be232c41c7c133b95445801a56844c2e92 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
/*
 * Copyright (C) 2012 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <linux/shmem_fs.h>
#include <drm/drmP.h>
#include "armada_drm.h"
#include "armada_gem.h"
#include <drm/armada_drm.h>
#include "armada_ioctlP.h"

static int armada_gem_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct armada_gem_object *obj = drm_to_armada_gem(vma->vm_private_data);
	unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
	int ret;

	pfn += (vmf->address - vma->vm_start) >> PAGE_SHIFT;
	ret = vm_insert_pfn(vma, vmf->address, pfn);

	switch (ret) {
	case 0:
	case -EBUSY:
		return VM_FAULT_NOPAGE;
	case -ENOMEM:
		return VM_FAULT_OOM;
	default:
		return VM_FAULT_SIGBUS;
	}
}

const struct vm_operations_struct armada_gem_vm_ops = {
	.fault	= armada_gem_vm_fault,
	.open	= drm_gem_vm_open,
	.close	= drm_gem_vm_close,
};

static size_t roundup_gem_size(size_t size)
{
	return roundup(size, PAGE_SIZE);
}

void armada_gem_free_object(struct drm_gem_object *obj)
{
	struct armada_gem_object *dobj = drm_to_armada_gem(obj);
	struct armada_private *priv = obj->dev->dev_private;

	DRM_DEBUG_DRIVER("release obj %p\n", dobj);

	drm_gem_free_mmap_offset(&dobj->obj);

	might_lock(&priv->linear_lock);

	if (dobj->page) {
		/* page backed memory */
		unsigned int order = get_order(dobj->obj.size);
		__free_pages(dobj->page, order);
	} else if (dobj->linear) {
		/* linear backed memory */
		mutex_lock(&priv->linear_lock);
		drm_mm_remove_node(dobj->linear);
		mutex_unlock(&priv->linear_lock);
		kfree(dobj->linear);
		if (dobj->addr)
			iounmap(dobj->addr);
	}

	if (dobj->obj.import_attach) {
		/* We only ever display imported data */
		if (dobj->sgt)
			dma_buf_unmap_attachment(dobj->obj.import_attach,
						 dobj->sgt, DMA_TO_DEVICE);
		drm_prime_gem_destroy(&dobj->obj, NULL);
	}

	drm_gem_object_release(&dobj->obj);

	kfree(dobj);
}

int
armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
{
	struct armada_private *priv = dev->dev_private;
	size_t size = obj->obj.size;

	if (obj->page || obj->linear)
		return 0;

	/*
	 * If it is a small allocation (typically cursor, which will
	 * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
	 * Framebuffers will never be this small (our minimum size for
	 * framebuffers is larger than this anyway.)  Such objects are
	 * only accessed by the CPU so we don't need any special handing
	 * here.
	 */
	if (size <= 8192) {
		unsigned int order = get_order(size);
		struct page *p = alloc_pages(GFP_KERNEL, order);

		if (p) {
			obj->addr = page_address(p);
			obj->phys_addr = page_to_phys(p);
			obj->page = p;

			memset(obj->addr, 0, PAGE_ALIGN(size));
		}
	}

	/*
	 * We could grab something from CMA if it's enabled, but that
	 * involves building in a problem:
	 *
	 * CMA's interface uses dma_alloc_coherent(), which provides us
	 * with an CPU virtual address and a device address.
	 *
	 * The CPU virtual address may be either an address in the kernel
	 * direct mapped region (for example, as it would be on x86) or
	 * it may be remapped into another part of kernel memory space
	 * (eg, as it would be on ARM.)  This means virt_to_phys() on the
	 * returned virtual address is invalid depending on the architecture
	 * implementation.
	 *
	 * The device address may also not be a physical address; it may
	 * be that there is some kind of remapping between the device and
	 * system RAM, which makes the use of the device address also
	 * unsafe to re-use as a physical address.
	 *
	 * This makes DRM usage of dma_alloc_coherent() in a generic way
	 * at best very questionable and unsafe.
	 */

	/* Otherwise, grab it from our linear allocation */
	if (!obj->page) {
		struct drm_mm_node *node;
		unsigned align = min_t(unsigned, size, SZ_2M);
		void __iomem *ptr;
		int ret;

		node = kzalloc(sizeof(*node), GFP_KERNEL);
		if (!node)
			return -ENOSPC;

		mutex_lock(&priv->linear_lock);
		ret = drm_mm_insert_node(&priv->linear, node, size, align,
					 DRM_MM_SEARCH_DEFAULT);
		mutex_unlock(&priv->linear_lock);
		if (ret) {
			kfree(node);
			return ret;
		}

		obj->linear = node;

		/* Ensure that the memory we're returning is cleared. */
		ptr = ioremap_wc(obj->linear->start, size);
		if (!ptr) {
			mutex_lock(&priv->linear_lock);
			drm_mm_remove_node(obj->linear);
			mutex_unlock(&priv->linear_lock);
			kfree(obj->linear);
			obj->linear = NULL;
			return -ENOMEM;
		}

		memset_io(ptr, 0, size);
		iounmap(ptr);

		obj->phys_addr = obj->linear->start;
		obj->dev_addr = obj->linear->start;
	}

	DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
			 (unsigned long long)obj->phys_addr,
			 (unsigned long long)obj->dev_addr);

	return 0;
}

void *
armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
{
	/* only linear objects need to be ioremap'd */
	if (!dobj->addr && dobj->linear)
		dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
	return dobj->addr;
}

struct armada_gem_object *
armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
{
	struct armada_gem_object *obj;

	size = roundup_gem_size(size);

	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	if (!obj)
		return NULL;

	drm_gem_private_object_init(dev, &obj->obj, size);
	obj->dev_addr = DMA_ERROR_CODE;

	DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);

	return obj;
}

static struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
	size_t size)
{
	struct armada_gem_object *obj;
	struct address_space *mapping;

	size = roundup_gem_size(size);

	obj = kzalloc(sizeof(*obj), GFP_KERNEL);
	if (!obj)
		return NULL;

	if (drm_gem_object_init(dev, &obj->obj, size)) {
		kfree(obj);
		return NULL;
	}

	obj->dev_addr = DMA_ERROR_CODE;

	mapping = obj->obj.filp->f_mapping;
	mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);

	DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);

	return obj;
}

/* Dumb alloc support */
int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
	struct drm_mode_create_dumb *args)
{
	struct armada_gem_object *dobj;
	u32 handle;
	size_t size;
	int ret;

	args->pitch = armada_pitch(args->width, args->bpp);
	args->size = size = args->pitch * args->height;

	dobj = armada_gem_alloc_private_object(dev, size);
	if (dobj == NULL)
		return -ENOMEM;

	ret = armada_gem_linear_back(dev, dobj);
	if (ret)
		goto err;

	ret = drm_gem_handle_create(file, &dobj->obj, &handle);
	if (ret)
		goto err;

	args->handle = handle;

	/* drop reference from allocate - handle holds it now */
	DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
 err:
	drm_gem_object_unreference_unlocked(&dobj->obj);
	return ret;
}

int armada_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
	uint32_t handle, uint64_t *offset)
{
	struct armada_gem_object *obj;
	int ret = 0;

	obj = armada_gem_object_lookup(file, handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object\n");
		return -EINVAL;
	}

	/* Don't allow imported objects to be mapped */
	if (obj->obj.import_attach) {
		ret = -EINVAL;
		goto err_unref;
	}

	ret = drm_gem_create_mmap_offset(&obj->obj);
	if (ret == 0) {
		*offset = drm_vma_node_offset_addr(&obj->obj.vma_node);
		DRM_DEBUG_DRIVER("handle %#x offset %llx\n", handle, *offset);
	}

 err_unref:
	drm_gem_object_unreference_unlocked(&obj->obj);

	return ret;
}

int armada_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
	uint32_t handle)
{
	return drm_gem_handle_delete(file, handle);
}

/* Private driver gem ioctls */
int armada_gem_create_ioctl(struct drm_device *dev, void *data,
	struct drm_file *file)
{
	struct drm_armada_gem_create *args = data;
	struct armada_gem_object *dobj;
	size_t size;
	u32 handle;
	int ret;

	if (args->size == 0)
		return -ENOMEM;

	size = args->size;

	dobj = armada_gem_alloc_object(dev, size);
	if (dobj == NULL)
		return -ENOMEM;

	ret = drm_gem_handle_create(file, &dobj->obj, &handle);
	if (ret)
		goto err;

	args->handle = handle;

	/* drop reference from allocate - handle holds it now */
	DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
 err:
	drm_gem_object_unreference_unlocked(&dobj->obj);
	return ret;
}

/* Map a shmem-backed object into process memory space */
int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
	struct drm_file *file)
{
	struct drm_armada_gem_mmap *args = data;
	struct armada_gem_object *dobj;
	unsigned long addr;

	dobj = armada_gem_object_lookup(file, args->handle);
	if (dobj == NULL)
		return -ENOENT;

	if (!dobj->obj.filp) {
		drm_gem_object_unreference_unlocked(&dobj->obj);
		return -EINVAL;
	}

	addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
		       MAP_SHARED, args->offset);
	drm_gem_object_unreference_unlocked(&dobj->obj);
	if (IS_ERR_VALUE(addr))
		return addr;

	args->addr = addr;

	return 0;
}

int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
	struct drm_file *file)
{
	struct drm_armada_gem_pwrite *args = data;
	struct armada_gem_object *dobj;
	char __user *ptr;
	int ret;

	DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
		args->handle, args->offset, args->size, args->ptr);

	if (args->size == 0)
		return 0;

	ptr = (char __user *)(uintptr_t)args->ptr;

	if (!access_ok(VERIFY_READ, ptr, args->size))
		return -EFAULT;

	ret = fault_in_pages_readable(ptr, args->size);
	if (ret)
		return ret;

	dobj = armada_gem_object_lookup(file, args->handle);
	if (dobj == NULL)
		return -ENOENT;

	/* Must be a kernel-mapped object */
	if (!dobj->addr)
		return -EINVAL;

	if (args->offset > dobj->obj.size ||
	    args->size > dobj->obj.size - args->offset) {
		DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
		ret = -EINVAL;
		goto unref;
	}

	if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
		ret = -EFAULT;
	} else if (dobj->update) {
		dobj->update(dobj->update_data);
		ret = 0;
	}

 unref:
	drm_gem_object_unreference_unlocked(&dobj->obj);
	return ret;
}

/* Prime support */
static struct sg_table *
armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
	enum dma_data_direction dir)
{
	struct drm_gem_object *obj = attach->dmabuf->priv;
	struct armada_gem_object *dobj = drm_to_armada_gem(obj);
	struct scatterlist *sg;
	struct sg_table *sgt;
	int i, num;

	sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
	if (!sgt)
		return NULL;

	if (dobj->obj.filp) {
		struct address_space *mapping;
		int count;

		count = dobj->obj.size / PAGE_SIZE;
		if (sg_alloc_table(sgt, count, GFP_KERNEL))
			goto free_sgt;

		mapping = dobj->obj.filp->f_mapping;

		for_each_sg(sgt->sgl, sg, count, i) {
			struct page *page;

			page = shmem_read_mapping_page(mapping, i);
			if (IS_ERR(page)) {
				num = i;
				goto release;
			}

			sg_set_page(sg, page, PAGE_SIZE, 0);
		}

		if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) {
			num = sgt->nents;
			goto release;
		}
	} else if (dobj->page) {
		/* Single contiguous page */
		if (sg_alloc_table(sgt, 1, GFP_KERNEL))
			goto free_sgt;

		sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);

		if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
			goto free_table;
	} else if (dobj->linear) {
		/* Single contiguous physical region - no struct page */
		if (sg_alloc_table(sgt, 1, GFP_KERNEL))
			goto free_sgt;
		sg_dma_address(sgt->sgl) = dobj->dev_addr;
		sg_dma_len(sgt->sgl) = dobj->obj.size;
	} else {
		goto free_sgt;
	}
	return sgt;

 release:
	for_each_sg(sgt->sgl, sg, num, i)
		put_page(sg_page(sg));
 free_table:
	sg_free_table(sgt);
 free_sgt:
	kfree(sgt);
	return NULL;
}

static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
	struct sg_table *sgt, enum dma_data_direction dir)
{
	struct drm_gem_object *obj = attach->dmabuf->priv;
	struct armada_gem_object *dobj = drm_to_armada_gem(obj);
	int i;

	if (!dobj->linear)
		dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);

	if (dobj->obj.filp) {
		struct scatterlist *sg;
		for_each_sg(sgt->sgl, sg, sgt->nents, i)
			put_page(sg_page(sg));
	}

	sg_free_table(sgt);
	kfree(sgt);
}

static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
{
	return NULL;
}

static void
armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
{
}

static int
armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
{
	return -EINVAL;
}

static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
	.map_dma_buf	= armada_gem_prime_map_dma_buf,
	.unmap_dma_buf	= armada_gem_prime_unmap_dma_buf,
	.release	= drm_gem_dmabuf_release,
	.kmap_atomic	= armada_gem_dmabuf_no_kmap,
	.kunmap_atomic	= armada_gem_dmabuf_no_kunmap,
	.kmap		= armada_gem_dmabuf_no_kmap,
	.kunmap		= armada_gem_dmabuf_no_kunmap,
	.mmap		= armada_gem_dmabuf_mmap,
};

struct dma_buf *
armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
	int flags)
{
	DEFINE_DMA_BUF_EXPORT_INFO(exp_info);

	exp_info.ops = &armada_gem_prime_dmabuf_ops;
	exp_info.size = obj->size;
	exp_info.flags = O_RDWR;
	exp_info.priv = obj;

	return drm_gem_dmabuf_export(dev, &exp_info);
}

struct drm_gem_object *
armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
{
	struct dma_buf_attachment *attach;
	struct armada_gem_object *dobj;

	if (buf->ops == &armada_gem_prime_dmabuf_ops) {
		struct drm_gem_object *obj = buf->priv;
		if (obj->dev == dev) {
			/*
			 * Importing our own dmabuf(s) increases the
			 * refcount on the gem object itself.
			 */
			drm_gem_object_reference(obj);
			return obj;
		}
	}

	attach = dma_buf_attach(buf, dev->dev);
	if (IS_ERR(attach))
		return ERR_CAST(attach);

	dobj = armada_gem_alloc_private_object(dev, buf->size);
	if (!dobj) {
		dma_buf_detach(buf, attach);
		return ERR_PTR(-ENOMEM);
	}

	dobj->obj.import_attach = attach;
	get_dma_buf(buf);

	/*
	 * Don't call dma_buf_map_attachment() here - it maps the
	 * scatterlist immediately for DMA, and this is not always
	 * an appropriate thing to do.
	 */
	return &dobj->obj;
}

int armada_gem_map_import(struct armada_gem_object *dobj)
{
	int ret;

	dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach,
					   DMA_TO_DEVICE);
	if (IS_ERR(dobj->sgt)) {
		ret = PTR_ERR(dobj->sgt);
		dobj->sgt = NULL;
		DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
		return ret;
	}
	if (dobj->sgt->nents > 1) {
		DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
		return -EINVAL;
	}
	if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
		DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
		return -EINVAL;
	}
	dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);
	return 0;
}