summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/intel_region_ttm.c
blob: 04525d92bec5e782b7b3de54c1a4fe6db9e76036 (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
// SPDX-License-Identifier: MIT
/*
 * Copyright © 2021 Intel Corporation
 */
#include <drm/ttm/ttm_device.h>
#include <drm/ttm/ttm_range_manager.h>

#include "i915_drv.h"
#include "i915_scatterlist.h"
#include "i915_ttm_buddy_manager.h"

#include "intel_region_ttm.h"

#include "gem/i915_gem_region.h"
#include "gem/i915_gem_ttm.h" /* For the funcs/ops export only */
/**
 * DOC: TTM support structure
 *
 * The code in this file deals with setting up memory managers for TTM
 * LMEM and MOCK regions and converting the output from
 * the managers to struct sg_table, Basically providing the mapping from
 * i915 GEM regions to TTM memory types and resource managers.
 */

/**
 * intel_region_ttm_device_init - Initialize a TTM device
 * @dev_priv: Pointer to an i915 device private structure.
 *
 * Return: 0 on success, negative error code on failure.
 */
int intel_region_ttm_device_init(struct drm_i915_private *dev_priv)
{
	struct drm_device *drm = &dev_priv->drm;

	return ttm_device_init(&dev_priv->bdev, i915_ttm_driver(),
			       drm->dev, drm->anon_inode->i_mapping,
			       drm->vma_offset_manager, false, false);
}

/**
 * intel_region_ttm_device_fini - Finalize a TTM device
 * @dev_priv: Pointer to an i915 device private structure.
 */
void intel_region_ttm_device_fini(struct drm_i915_private *dev_priv)
{
	ttm_device_fini(&dev_priv->bdev);
}

/*
 * Map the i915 memory regions to TTM memory types. We use the
 * driver-private types for now, reserving TTM_PL_VRAM for stolen
 * memory and TTM_PL_TT for GGTT use if decided to implement this.
 */
int intel_region_to_ttm_type(const struct intel_memory_region *mem)
{
	int type;

	GEM_BUG_ON(mem->type != INTEL_MEMORY_LOCAL &&
		   mem->type != INTEL_MEMORY_MOCK &&
		   mem->type != INTEL_MEMORY_SYSTEM);

	if (mem->type == INTEL_MEMORY_SYSTEM)
		return TTM_PL_SYSTEM;

	type = mem->instance + TTM_PL_PRIV;
	GEM_BUG_ON(type >= TTM_NUM_MEM_TYPES);

	return type;
}

/**
 * intel_region_ttm_init - Initialize a memory region for TTM.
 * @mem: The region to initialize.
 *
 * This function initializes a suitable TTM resource manager for the
 * region, and if it's a LMEM region type, attaches it to the TTM
 * device. MOCK regions are NOT attached to the TTM device, since we don't
 * have one for the mock selftests.
 *
 * Return: 0 on success, negative error code on failure.
 */
int intel_region_ttm_init(struct intel_memory_region *mem)
{
	struct ttm_device *bdev = &mem->i915->bdev;
	int mem_type = intel_region_to_ttm_type(mem);
	int ret;

	ret = i915_ttm_buddy_man_init(bdev, mem_type, false,
				      resource_size(&mem->region),
				      resource_size(&mem->io),
				      mem->min_page_size, PAGE_SIZE);
	if (ret)
		return ret;

	mem->region_private = ttm_manager_type(bdev, mem_type);

	return 0;
}

/**
 * intel_region_ttm_fini - Finalize a TTM region.
 * @mem: The memory region
 *
 * This functions takes down the TTM resource manager associated with the
 * memory region, and if it was registered with the TTM device,
 * removes that registration.
 */
int intel_region_ttm_fini(struct intel_memory_region *mem)
{
	struct ttm_resource_manager *man = mem->region_private;
	int ret = -EBUSY;
	int count;

	/*
	 * Put the region's move fences. This releases requests that
	 * may hold on to contexts and vms that may hold on to buffer
	 * objects placed in this region.
	 */
	if (man)
		ttm_resource_manager_cleanup(man);

	/* Flush objects from region. */
	for (count = 0; count < 10; ++count) {
		i915_gem_flush_free_objects(mem->i915);

		mutex_lock(&mem->objects.lock);
		if (list_empty(&mem->objects.list))
			ret = 0;
		mutex_unlock(&mem->objects.lock);
		if (!ret)
			break;

		msleep(20);
		drain_workqueue(mem->i915->bdev.wq);
	}

	/* If we leaked objects, Don't free the region causing use after free */
	if (ret || !man)
		return ret;

	ret = i915_ttm_buddy_man_fini(&mem->i915->bdev,
				      intel_region_to_ttm_type(mem));
	GEM_WARN_ON(ret);
	mem->region_private = NULL;

	return ret;
}

/**
 * intel_region_ttm_resource_to_rsgt -
 * Convert an opaque TTM resource manager resource to a refcounted sg_table.
 * @mem: The memory region.
 * @res: The resource manager resource obtained from the TTM resource manager.
 * @page_alignment: Required page alignment for each sg entry. Power of two.
 *
 * The gem backends typically use sg-tables for operations on the underlying
 * io_memory. So provide a way for the backends to translate the
 * nodes they are handed from TTM to sg-tables.
 *
 * Return: A malloced sg_table on success, an error pointer on failure.
 */
struct i915_refct_sgt *
intel_region_ttm_resource_to_rsgt(struct intel_memory_region *mem,
				  struct ttm_resource *res,
				  u32 page_alignment)
{
	if (mem->is_range_manager) {
		struct ttm_range_mgr_node *range_node =
			to_ttm_range_mgr_node(res);

		return i915_rsgt_from_mm_node(&range_node->mm_nodes[0],
					      mem->region.start,
					      page_alignment);
	} else {
		return i915_rsgt_from_buddy_resource(res, mem->region.start,
						     page_alignment);
	}
}

#ifdef CONFIG_DRM_I915_SELFTEST
/**
 * intel_region_ttm_resource_alloc - Allocate memory resources from a region
 * @mem: The memory region,
 * @offset: BO offset
 * @size: The requested size in bytes
 * @flags: Allocation flags
 *
 * This functionality is provided only for callers that need to allocate
 * memory from standalone TTM range managers, without the TTM eviction
 * functionality. Don't use if you are not completely sure that's the
 * case. The returned opaque node can be converted to an sg_table using
 * intel_region_ttm_resource_to_st(), and can be freed using
 * intel_region_ttm_resource_free().
 *
 * Return: A valid pointer on success, an error pointer on failure.
 */
struct ttm_resource *
intel_region_ttm_resource_alloc(struct intel_memory_region *mem,
				resource_size_t offset,
				resource_size_t size,
				unsigned int flags)
{
	struct ttm_resource_manager *man = mem->region_private;
	struct ttm_place place = {};
	struct ttm_buffer_object mock_bo = {};
	struct ttm_resource *res;
	int ret;

	if (flags & I915_BO_ALLOC_CONTIGUOUS)
		place.flags |= TTM_PL_FLAG_CONTIGUOUS;
	if (offset != I915_BO_INVALID_OFFSET) {
		if (WARN_ON(overflows_type(offset >> PAGE_SHIFT, place.fpfn))) {
			ret = -E2BIG;
			goto out;
		}
		place.fpfn = offset >> PAGE_SHIFT;
		if (WARN_ON(overflows_type(place.fpfn + (size >> PAGE_SHIFT), place.lpfn))) {
			ret = -E2BIG;
			goto out;
		}
		place.lpfn = place.fpfn + (size >> PAGE_SHIFT);
	} else if (resource_size(&mem->io) && resource_size(&mem->io) < mem->total) {
		if (flags & I915_BO_ALLOC_GPU_ONLY) {
			place.flags |= TTM_PL_FLAG_TOPDOWN;
		} else {
			place.fpfn = 0;
			if (WARN_ON(overflows_type(resource_size(&mem->io) >> PAGE_SHIFT, place.lpfn))) {
				ret = -E2BIG;
				goto out;
			}
			place.lpfn = resource_size(&mem->io) >> PAGE_SHIFT;
		}
	}

	mock_bo.base.size = size;
	mock_bo.bdev = &mem->i915->bdev;

	ret = man->func->alloc(man, &mock_bo, &place, &res);

out:
	if (ret == -ENOSPC)
		ret = -ENXIO;
	if (!ret)
		res->bo = NULL; /* Rather blow up, then some uaf */
	return ret ? ERR_PTR(ret) : res;
}

#endif

/**
 * intel_region_ttm_resource_free - Free a resource allocated from a resource manager
 * @mem: The region the resource was allocated from.
 * @res: The opaque resource representing an allocation.
 */
void intel_region_ttm_resource_free(struct intel_memory_region *mem,
				    struct ttm_resource *res)
{
	struct ttm_resource_manager *man = mem->region_private;
	struct ttm_buffer_object mock_bo = {};

	mock_bo.base.size = res->size;
	mock_bo.bdev = &mem->i915->bdev;
	res->bo = &mock_bo;

	man->func->free(man, res);
}