summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/intel_memory_region.c
blob: e38d2db1c3e325002759d7afc8a887f8e1ef29f3 (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
// SPDX-License-Identifier: MIT
/*
 * Copyright © 2019 Intel Corporation
 */

#include <linux/prandom.h>

#include <uapi/drm/i915_drm.h>

#include "intel_memory_region.h"
#include "i915_drv.h"
#include "i915_ttm_buddy_manager.h"

static const struct {
	u16 class;
	u16 instance;
} intel_region_map[] = {
	[INTEL_REGION_SMEM] = {
		.class = INTEL_MEMORY_SYSTEM,
		.instance = 0,
	},
	[INTEL_REGION_LMEM_0] = {
		.class = INTEL_MEMORY_LOCAL,
		.instance = 0,
	},
	[INTEL_REGION_STOLEN_SMEM] = {
		.class = INTEL_MEMORY_STOLEN_SYSTEM,
		.instance = 0,
	},
	[INTEL_REGION_STOLEN_LMEM] = {
		.class = INTEL_MEMORY_STOLEN_LOCAL,
		.instance = 0,
	},
};

static int __iopagetest(struct intel_memory_region *mem,
			u8 __iomem *va, int pagesize,
			u8 value, resource_size_t offset,
			const void *caller)
{
	int byte = prandom_u32_max(pagesize);
	u8 result[3];

	memset_io(va, value, pagesize); /* or GPF! */
	wmb();

	result[0] = ioread8(va);
	result[1] = ioread8(va + byte);
	result[2] = ioread8(va + pagesize - 1);
	if (memchr_inv(result, value, sizeof(result))) {
		dev_err(mem->i915->drm.dev,
			"Failed to read back from memory region:%pR at [%pa + %pa] for %ps; wrote %x, read (%x, %x, %x)\n",
			&mem->region, &mem->io_start, &offset, caller,
			value, result[0], result[1], result[2]);
		return -EINVAL;
	}

	return 0;
}

static int iopagetest(struct intel_memory_region *mem,
		      resource_size_t offset,
		      const void *caller)
{
	const u8 val[] = { 0x0, 0xa5, 0xc3, 0xf0 };
	void __iomem *va;
	int err;
	int i;

	va = ioremap_wc(mem->io_start + offset, PAGE_SIZE);
	if (!va) {
		dev_err(mem->i915->drm.dev,
			"Failed to ioremap memory region [%pa + %pa] for %ps\n",
			&mem->io_start, &offset, caller);
		return -EFAULT;
	}

	for (i = 0; i < ARRAY_SIZE(val); i++) {
		err = __iopagetest(mem, va, PAGE_SIZE, val[i], offset, caller);
		if (err)
			break;

		err = __iopagetest(mem, va, PAGE_SIZE, ~val[i], offset, caller);
		if (err)
			break;
	}

	iounmap(va);
	return err;
}

static resource_size_t random_page(resource_size_t last)
{
	/* Limited to low 44b (16TiB), but should suffice for a spot check */
	return prandom_u32_max(last >> PAGE_SHIFT) << PAGE_SHIFT;
}

static int iomemtest(struct intel_memory_region *mem,
		     bool test_all,
		     const void *caller)
{
	resource_size_t last, page;
	int err;

	if (mem->io_size < PAGE_SIZE)
		return 0;

	last = mem->io_size - PAGE_SIZE;

	/*
	 * Quick test to check read/write access to the iomap (backing store).
	 *
	 * Write a byte, read it back. If the iomapping fails, we expect
	 * a GPF preventing further execution. If the backing store does not
	 * exist, the read back will return garbage. We check a couple of pages,
	 * the first and last of the specified region to confirm the backing
	 * store + iomap does cover the entire memory region; and we check
	 * a random offset within as a quick spot check for bad memory.
	 */

	if (test_all) {
		for (page = 0; page <= last; page += PAGE_SIZE) {
			err = iopagetest(mem, page, caller);
			if (err)
				return err;
		}
	} else {
		err = iopagetest(mem, 0, caller);
		if (err)
			return err;

		err = iopagetest(mem, last, caller);
		if (err)
			return err;

		err = iopagetest(mem, random_page(last), caller);
		if (err)
			return err;
	}

	return 0;
}

struct intel_memory_region *
intel_memory_region_lookup(struct drm_i915_private *i915,
			   u16 class, u16 instance)
{
	struct intel_memory_region *mr;
	int id;

	/* XXX: consider maybe converting to an rb tree at some point */
	for_each_memory_region(mr, i915, id) {
		if (mr->type == class && mr->instance == instance)
			return mr;
	}

	return NULL;
}

struct intel_memory_region *
intel_memory_region_by_type(struct drm_i915_private *i915,
			    enum intel_memory_type mem_type)
{
	struct intel_memory_region *mr;
	int id;

	for_each_memory_region(mr, i915, id)
		if (mr->type == mem_type)
			return mr;

	return NULL;
}

/**
 * intel_memory_region_reserve - Reserve a memory range
 * @mem: The region for which we want to reserve a range.
 * @offset: Start of the range to reserve.
 * @size: The size of the range to reserve.
 *
 * Return: 0 on success, negative error code on failure.
 */
int intel_memory_region_reserve(struct intel_memory_region *mem,
				resource_size_t offset,
				resource_size_t size)
{
	struct ttm_resource_manager *man = mem->region_private;

	GEM_BUG_ON(mem->is_range_manager);

	return i915_ttm_buddy_man_reserve(man, offset, size);
}

void intel_memory_region_debug(struct intel_memory_region *mr,
			       struct drm_printer *printer)
{
	drm_printf(printer, "%s: ", mr->name);

	if (mr->region_private)
		ttm_resource_manager_debug(mr->region_private, printer);
	else
		drm_printf(printer, "total:%pa, available:%pa bytes\n",
			   &mr->total, &mr->avail);
}

static int intel_memory_region_memtest(struct intel_memory_region *mem,
				       void *caller)
{
	struct drm_i915_private *i915 = mem->i915;
	int err = 0;

	if (!mem->io_start)
		return 0;

	if (IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM) || i915->params.memtest)
		err = iomemtest(mem, i915->params.memtest, caller);

	return err;
}

struct intel_memory_region *
intel_memory_region_create(struct drm_i915_private *i915,
			   resource_size_t start,
			   resource_size_t size,
			   resource_size_t min_page_size,
			   resource_size_t io_start,
			   resource_size_t io_size,
			   u16 type,
			   u16 instance,
			   const struct intel_memory_region_ops *ops)
{
	struct intel_memory_region *mem;
	int err;

	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
	if (!mem)
		return ERR_PTR(-ENOMEM);

	mem->i915 = i915;
	mem->region = (struct resource)DEFINE_RES_MEM(start, size);
	mem->io_start = io_start;
	mem->io_size = io_size;
	mem->min_page_size = min_page_size;
	mem->ops = ops;
	mem->total = size;
	mem->avail = mem->total;
	mem->type = type;
	mem->instance = instance;

	mutex_init(&mem->objects.lock);
	INIT_LIST_HEAD(&mem->objects.list);

	if (ops->init) {
		err = ops->init(mem);
		if (err)
			goto err_free;
	}

	err = intel_memory_region_memtest(mem, (void *)_RET_IP_);
	if (err)
		goto err_release;

	return mem;

err_release:
	if (mem->ops->release)
		mem->ops->release(mem);
err_free:
	kfree(mem);
	return ERR_PTR(err);
}

void intel_memory_region_set_name(struct intel_memory_region *mem,
				  const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vsnprintf(mem->name, sizeof(mem->name), fmt, ap);
	va_end(ap);
}

void intel_memory_region_destroy(struct intel_memory_region *mem)
{
	int ret = 0;

	if (mem->ops->release)
		ret = mem->ops->release(mem);

	GEM_WARN_ON(!list_empty_careful(&mem->objects.list));
	mutex_destroy(&mem->objects.lock);
	if (!ret)
		kfree(mem);
}

/* Global memory region registration -- only slight layer inversions! */

int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
{
	int err, i;

	for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
		struct intel_memory_region *mem = ERR_PTR(-ENODEV);
		u16 type, instance;

		if (!HAS_REGION(i915, BIT(i)))
			continue;

		type = intel_region_map[i].class;
		instance = intel_region_map[i].instance;
		switch (type) {
		case INTEL_MEMORY_SYSTEM:
			if (IS_DGFX(i915))
				mem = i915_gem_ttm_system_setup(i915, type,
								instance);
			else
				mem = i915_gem_shmem_setup(i915, type,
							   instance);
			break;
		case INTEL_MEMORY_STOLEN_LOCAL:
			mem = i915_gem_stolen_lmem_setup(i915, type, instance);
			if (!IS_ERR(mem))
				i915->mm.stolen_region = mem;
			break;
		case INTEL_MEMORY_STOLEN_SYSTEM:
			mem = i915_gem_stolen_smem_setup(i915, type, instance);
			if (!IS_ERR(mem))
				i915->mm.stolen_region = mem;
			break;
		default:
			continue;
		}

		if (IS_ERR(mem)) {
			err = PTR_ERR(mem);
			drm_err(&i915->drm,
				"Failed to setup region(%d) type=%d\n",
				err, type);
			goto out_cleanup;
		}

		mem->id = i;
		i915->mm.regions[i] = mem;
	}

	return 0;

out_cleanup:
	intel_memory_regions_driver_release(i915);
	return err;
}

void intel_memory_regions_driver_release(struct drm_i915_private *i915)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
		struct intel_memory_region *region =
			fetch_and_zero(&i915->mm.regions[i]);

		if (region)
			intel_memory_region_destroy(region);
	}
}

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/intel_memory_region.c"
#include "selftests/mock_region.c"
#endif