summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/gma500/gem.c
blob: 4b7627a7263788b939025dd298699e2565b1fa6e (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *  psb GEM interface
 *
 * Copyright (c) 2011, Intel Corporation.
 *
 * Authors: Alan Cox
 *
 * TODO:
 *	-	we need to work out if the MMU is relevant (eg for
 *		accelerated operations on a GEM object)
 */

#include <linux/pagemap.h>

#include <asm/set_memory.h>

#include <drm/drm.h>
#include <drm/drm_vma_manager.h>

#include "gem.h"
#include "psb_drv.h"

/*
 * PSB GEM object
 */

int psb_gem_pin(struct psb_gem_object *pobj)
{
	struct drm_gem_object *obj = &pobj->base;
	struct drm_device *dev = obj->dev;
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
	u32 gpu_base = dev_priv->gtt.gatt_start;
	struct page **pages;
	unsigned int npages;
	int ret;

	ret = dma_resv_lock(obj->resv, NULL);
	if (drm_WARN_ONCE(dev, ret, "dma_resv_lock() failed, ret=%d\n", ret))
		return ret;

	if (pobj->in_gart || pobj->stolen)
		goto out; /* already mapped */

	pages = drm_gem_get_pages(obj);
	if (IS_ERR(pages)) {
		ret = PTR_ERR(pages);
		goto err_dma_resv_unlock;
	}

	npages = obj->size / PAGE_SIZE;

	set_pages_array_wc(pages, npages);

	psb_gtt_insert_pages(dev_priv, &pobj->resource, pages);
	psb_mmu_insert_pages(psb_mmu_get_default_pd(dev_priv->mmu), pages,
			     (gpu_base + pobj->offset), npages, 0, 0,
			     PSB_MMU_CACHED_MEMORY);

	pobj->pages = pages;

out:
	++pobj->in_gart;
	dma_resv_unlock(obj->resv);

	return 0;

err_dma_resv_unlock:
	dma_resv_unlock(obj->resv);
	return ret;
}

void psb_gem_unpin(struct psb_gem_object *pobj)
{
	struct drm_gem_object *obj = &pobj->base;
	struct drm_device *dev = obj->dev;
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
	u32 gpu_base = dev_priv->gtt.gatt_start;
	unsigned long npages;
	int ret;

	ret = dma_resv_lock(obj->resv, NULL);
	if (drm_WARN_ONCE(dev, ret, "dma_resv_lock() failed, ret=%d\n", ret))
		return;

	WARN_ON(!pobj->in_gart);

	--pobj->in_gart;

	if (pobj->in_gart || pobj->stolen)
		goto out;

	npages = obj->size / PAGE_SIZE;

	psb_mmu_remove_pages(psb_mmu_get_default_pd(dev_priv->mmu),
			     (gpu_base + pobj->offset), npages, 0, 0);
	psb_gtt_remove_pages(dev_priv, &pobj->resource);

	/* Reset caching flags */
	set_pages_array_wb(pobj->pages, npages);

	drm_gem_put_pages(obj, pobj->pages, true, false);
	pobj->pages = NULL;

out:
	dma_resv_unlock(obj->resv);
}

static vm_fault_t psb_gem_fault(struct vm_fault *vmf);

static void psb_gem_free_object(struct drm_gem_object *obj)
{
	struct psb_gem_object *pobj = to_psb_gem_object(obj);

	/* Undo the mmap pin if we are destroying the object */
	if (pobj->mmapping)
		psb_gem_unpin(pobj);

	drm_gem_object_release(obj);

	WARN_ON(pobj->in_gart && !pobj->stolen);

	release_resource(&pobj->resource);
	kfree(pobj);
}

static const struct vm_operations_struct psb_gem_vm_ops = {
	.fault = psb_gem_fault,
	.open = drm_gem_vm_open,
	.close = drm_gem_vm_close,
};

static const struct drm_gem_object_funcs psb_gem_object_funcs = {
	.free = psb_gem_free_object,
	.vm_ops = &psb_gem_vm_ops,
};

struct psb_gem_object *
psb_gem_create(struct drm_device *dev, u64 size, const char *name, bool stolen, u32 align)
{
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
	struct psb_gem_object *pobj;
	struct drm_gem_object *obj;
	int ret;

	size = roundup(size, PAGE_SIZE);

	pobj = kzalloc(sizeof(*pobj), GFP_KERNEL);
	if (!pobj)
		return ERR_PTR(-ENOMEM);
	obj = &pobj->base;

	/* GTT resource */

	ret = psb_gtt_allocate_resource(dev_priv, &pobj->resource, name, size, align, stolen,
					&pobj->offset);
	if (ret)
		goto err_kfree;

	if (stolen) {
		pobj->stolen = true;
		pobj->in_gart = 1;
	}

	/* GEM object */

	obj->funcs = &psb_gem_object_funcs;

	if (stolen) {
		drm_gem_private_object_init(dev, obj, size);
	} else {
		ret = drm_gem_object_init(dev, obj, size);
		if (ret)
			goto err_release_resource;

		/* Limit the object to 32-bit mappings */
		mapping_set_gfp_mask(obj->filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
	}

	return pobj;

err_release_resource:
	release_resource(&pobj->resource);
err_kfree:
	kfree(pobj);
	return ERR_PTR(ret);
}

/**
 *	psb_gem_dumb_create	-	create a dumb buffer
 *	@file: our client file
 *	@dev: our device
 *	@args: the requested arguments copied from userspace
 *
 *	Allocate a buffer suitable for use for a frame buffer of the
 *	form described by user space. Give userspace a handle by which
 *	to reference it.
 */
int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
			struct drm_mode_create_dumb *args)
{
	size_t pitch, size;
	struct psb_gem_object *pobj;
	struct drm_gem_object *obj;
	u32 handle;
	int ret;

	pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
	pitch = ALIGN(pitch, 64);

	size = pitch * args->height;
	size = roundup(size, PAGE_SIZE);
	if (!size)
		return -EINVAL;

	pobj = psb_gem_create(dev, size, "gem", false, PAGE_SIZE);
	if (IS_ERR(pobj))
		return PTR_ERR(pobj);
	obj = &pobj->base;

	ret = drm_gem_handle_create(file, obj, &handle);
	if (ret)
		goto err_drm_gem_object_put;

	drm_gem_object_put(obj);

	args->pitch = pitch;
	args->size = size;
	args->handle = handle;

	return 0;

err_drm_gem_object_put:
	drm_gem_object_put(obj);
	return ret;
}

/**
 *	psb_gem_fault		-	pagefault handler for GEM objects
 *	@vmf: fault detail
 *
 *	Invoked when a fault occurs on an mmap of a GEM managed area. GEM
 *	does most of the work for us including the actual map/unmap calls
 *	but we need to do the actual page work.
 *
 *	This code eventually needs to handle faulting objects in and out
 *	of the GTT and repacking it when we run out of space. We can put
 *	that off for now and for our simple uses
 *
 *	The VMA was set up by GEM. In doing so it also ensured that the
 *	vma->vm_private_data points to the GEM object that is backing this
 *	mapping.
 */
static vm_fault_t psb_gem_fault(struct vm_fault *vmf)
{
	struct vm_area_struct *vma = vmf->vma;
	struct drm_gem_object *obj;
	struct psb_gem_object *pobj;
	int err;
	vm_fault_t ret;
	unsigned long pfn;
	pgoff_t page_offset;
	struct drm_device *dev;
	struct drm_psb_private *dev_priv;

	obj = vma->vm_private_data;	/* GEM object */
	dev = obj->dev;
	dev_priv = to_drm_psb_private(dev);

	pobj = to_psb_gem_object(obj);

	/* Make sure we don't parallel update on a fault, nor move or remove
	   something from beneath our feet */
	mutex_lock(&dev_priv->mmap_mutex);

	/* For now the mmap pins the object and it stays pinned. As things
	   stand that will do us no harm */
	if (pobj->mmapping == 0) {
		err = psb_gem_pin(pobj);
		if (err < 0) {
			dev_err(dev->dev, "gma500: pin failed: %d\n", err);
			ret = vmf_error(err);
			goto fail;
		}
		pobj->mmapping = 1;
	}

	/* Page relative to the VMA start - we must calculate this ourselves
	   because vmf->pgoff is the fake GEM offset */
	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;

	/* CPU view of the page, don't go via the GART for CPU writes */
	if (pobj->stolen)
		pfn = (dev_priv->stolen_base + pobj->offset) >> PAGE_SHIFT;
	else
		pfn = page_to_pfn(pobj->pages[page_offset]);
	ret = vmf_insert_pfn(vma, vmf->address, pfn);
fail:
	mutex_unlock(&dev_priv->mmap_mutex);

	return ret;
}

/*
 * Memory management
 */

/* Insert vram stolen pages into the GTT. */
static void psb_gem_mm_populate_stolen(struct drm_psb_private *pdev)
{
	struct drm_device *dev = &pdev->dev;
	unsigned int pfn_base;
	unsigned int i, num_pages;
	uint32_t pte;

	pfn_base = pdev->stolen_base >> PAGE_SHIFT;
	num_pages = pdev->vram_stolen_size >> PAGE_SHIFT;

	drm_dbg(dev, "Set up %u stolen pages starting at 0x%08x, GTT offset %dK\n",
		num_pages, pfn_base << PAGE_SHIFT, 0);

	for (i = 0; i < num_pages; ++i) {
		pte = psb_gtt_mask_pte(pfn_base + i, PSB_MMU_CACHED_MEMORY);
		iowrite32(pte, pdev->gtt_map + i);
	}

	(void)ioread32(pdev->gtt_map + i - 1);
}

int psb_gem_mm_init(struct drm_device *dev)
{
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
	struct pci_dev *pdev = to_pci_dev(dev->dev);
	unsigned long stolen_size, vram_stolen_size;
	struct psb_gtt *pg;
	int ret;

	mutex_init(&dev_priv->mmap_mutex);

	pg = &dev_priv->gtt;

	pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
	vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;

	stolen_size = vram_stolen_size;

	dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n",
		dev_priv->stolen_base, vram_stolen_size / 1024);

	pg->stolen_size = stolen_size;
	dev_priv->vram_stolen_size = vram_stolen_size;

	dev_priv->vram_addr = ioremap_wc(dev_priv->stolen_base, stolen_size);
	if (!dev_priv->vram_addr) {
		dev_err(dev->dev, "Failure to map stolen base.\n");
		ret = -ENOMEM;
		goto err_mutex_destroy;
	}

	psb_gem_mm_populate_stolen(dev_priv);

	return 0;

err_mutex_destroy:
	mutex_destroy(&dev_priv->mmap_mutex);
	return ret;
}

void psb_gem_mm_fini(struct drm_device *dev)
{
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);

	iounmap(dev_priv->vram_addr);

	mutex_destroy(&dev_priv->mmap_mutex);
}

/* Re-insert all pinned GEM objects into GTT. */
static void psb_gem_mm_populate_resources(struct drm_psb_private *pdev)
{
	unsigned int restored = 0, total = 0, size = 0;
	struct resource *r = pdev->gtt_mem->child;
	struct drm_device *dev = &pdev->dev;
	struct psb_gem_object *pobj;

	while (r) {
		/*
		 * TODO: GTT restoration needs a refactoring, so that we don't have to touch
		 *       struct psb_gem_object here. The type represents a GEM object and is
		 *       not related to the GTT itself.
		 */
		pobj = container_of(r, struct psb_gem_object, resource);
		if (pobj->pages) {
			psb_gtt_insert_pages(pdev, &pobj->resource, pobj->pages);
			size += resource_size(&pobj->resource);
			++restored;
		}
		r = r->sibling;
		++total;
	}

	drm_dbg(dev, "Restored %u of %u gtt ranges (%u KB)", restored, total, (size / 1024));
}

int psb_gem_mm_resume(struct drm_device *dev)
{
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
	struct pci_dev *pdev = to_pci_dev(dev->dev);
	unsigned long stolen_size, vram_stolen_size;
	struct psb_gtt *pg;

	pg = &dev_priv->gtt;

	pci_read_config_dword(pdev, PSB_BSM, &dev_priv->stolen_base);
	vram_stolen_size = pg->gtt_phys_start - dev_priv->stolen_base - PAGE_SIZE;

	stolen_size = vram_stolen_size;

	dev_dbg(dev->dev, "Stolen memory base 0x%x, size %luK\n", dev_priv->stolen_base,
		vram_stolen_size / 1024);

	if (stolen_size != pg->stolen_size) {
		dev_err(dev->dev, "GTT resume error.\n");
		return -EINVAL;
	}

	psb_gem_mm_populate_stolen(dev_priv);
	psb_gem_mm_populate_resources(dev_priv);

	return 0;
}