summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/i915/intel_region_ttm.c
blob: 27fe0668d0941d5777973d2aba17e86eab28b6ce (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
// SPDX-License-Identifier: MIT
/*
 * Copyright © 2021 Intel Corporation
 */
#include <drm/ttm/ttm_bo_driver.h>
#include <drm/ttm/ttm_device.h>
#include <drm/ttm/ttm_range_manager.h>

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

#include "intel_region_ttm.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.
 */
static int intel_region_to_ttm_type(struct intel_memory_region *mem)
{
	int type;

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

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

	return type;
}

static struct ttm_resource *
intel_region_ttm_node_reserve(struct intel_memory_region *mem,
			      resource_size_t offset,
			      resource_size_t size)
{
	struct ttm_resource_manager *man = mem->region_private;
	struct ttm_place place = {};
	struct ttm_buffer_object mock_bo = {};
	struct ttm_resource *res;
	int ret;

	/*
	 * Having to use a mock_bo is unfortunate but stems from some
	 * drivers having private managers that insist to know what the
	 * allocate memory is intended for, using it to send private
	 * data to the manager. Also recently the bo has been used to send
	 * alignment info to the manager. Assume that apart from the latter,
	 * none of the managers we use will ever access the buffer object
	 * members, hoping we can pass the alignment info in the
	 * struct ttm_place in the future.
	 */

	place.fpfn = offset >> PAGE_SHIFT;
	place.lpfn = place.fpfn + (size >> PAGE_SHIFT);
	mock_bo.base.size = size;
	ret = man->func->alloc(man, &mock_bo, &place, &res);
	if (ret == -ENOSPC)
		ret = -ENXIO;

	return ret ? ERR_PTR(ret) : res;
}

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

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

static const struct intel_memory_region_private_ops priv_ops = {
	.reserve = intel_region_ttm_node_reserve,
	.free = intel_region_ttm_node_free,
};

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 = ttm_range_man_init(bdev, mem_type, false,
				 resource_size(&mem->region) >> PAGE_SHIFT);
	if (ret)
		return ret;

	mem->chunk_size = PAGE_SIZE;
	mem->max_order =
		get_order(rounddown_pow_of_two(resource_size(&mem->region)));
	mem->is_range_manager = true;
	mem->priv_ops = &priv_ops;
	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.
 */
void intel_region_ttm_fini(struct intel_memory_region *mem)
{
	int ret;

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

/**
 * intel_region_ttm_node_to_st - Convert an opaque TTM resource manager node
 * to an sg_table.
 * @mem: The memory region.
 * @node: The resource manager node obtained from the TTM resource manager.
 *
 * 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 sg_table *intel_region_ttm_node_to_st(struct intel_memory_region *mem,
					     struct ttm_resource *res)
{
	struct ttm_range_mgr_node *range_node =
		container_of(res, typeof(*range_node), base);

	GEM_WARN_ON(!mem->is_range_manager);
	return i915_sg_from_mm_node(&range_node->mm_nodes[0],
				    mem->region.start);
}

#ifdef CONFIG_DRM_I915_SELFTEST
/**
 * intel_region_ttm_node_alloc - Allocate memory resources from a region
 * @mem: The memory region,
 * @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_node_to_st(), and can be freed using
 * intel_region_ttm_node_free().
 *
 * Return: A valid pointer on success, an error pointer on failure.
 */
struct ttm_resource *
intel_region_ttm_node_alloc(struct intel_memory_region *mem,
			    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;

	/*
	 * We ignore the flags for now since we're using the range
	 * manager and contigous and min page size would be fulfilled
	 * by default if size is min page size aligned.
	 */
	mock_bo.base.size = size;

	if (mem->is_range_manager) {
		if (size >= SZ_1G)
			mock_bo.page_alignment = SZ_1G >> PAGE_SHIFT;
		else if (size >= SZ_2M)
			mock_bo.page_alignment = SZ_2M >> PAGE_SHIFT;
		else if (size >= SZ_64K)
			mock_bo.page_alignment = SZ_64K >> PAGE_SHIFT;
	}

	ret = man->func->alloc(man, &mock_bo, &place, &res);
	if (ret == -ENOSPC)
		ret = -ENXIO;
	return ret ? ERR_PTR(ret) : res;
}
#endif