1 // SPDX-License-Identifier: MIT
2 /*
3  * Copyright © 2019 Intel Corporation
4  */
5 
6 #include "intel_memory_region.h"
7 #include "i915_drv.h"
8 
9 /* XXX: Hysterical raisins. BIT(inst) needs to just be (inst) at some point. */
10 #define REGION_MAP(type, inst) \
11 	BIT((type) + INTEL_MEMORY_TYPE_SHIFT) | BIT(inst)
12 
13 static const u32 intel_region_map[] = {
14 	[INTEL_REGION_SMEM] = REGION_MAP(INTEL_MEMORY_SYSTEM, 0),
15 	[INTEL_REGION_LMEM] = REGION_MAP(INTEL_MEMORY_LOCAL, 0),
16 	[INTEL_REGION_STOLEN] = REGION_MAP(INTEL_MEMORY_STOLEN, 0),
17 };
18 
19 struct intel_memory_region *
20 intel_memory_region_by_type(struct drm_i915_private *i915,
21 			    enum intel_memory_type mem_type)
22 {
23 	struct intel_memory_region *mr;
24 	int id;
25 
26 	for_each_memory_region(mr, i915, id)
27 		if (mr->type == mem_type)
28 			return mr;
29 
30 	return NULL;
31 }
32 
33 static u64
34 intel_memory_region_free_pages(struct intel_memory_region *mem,
35 			       struct list_head *blocks)
36 {
37 	struct i915_buddy_block *block, *on;
38 	u64 size = 0;
39 
40 	list_for_each_entry_safe(block, on, blocks, link) {
41 		size += i915_buddy_block_size(&mem->mm, block);
42 		i915_buddy_free(&mem->mm, block);
43 	}
44 	INIT_LIST_HEAD(blocks);
45 
46 	return size;
47 }
48 
49 void
50 __intel_memory_region_put_pages_buddy(struct intel_memory_region *mem,
51 				      struct list_head *blocks)
52 {
53 	mutex_lock(&mem->mm_lock);
54 	mem->avail += intel_memory_region_free_pages(mem, blocks);
55 	mutex_unlock(&mem->mm_lock);
56 }
57 
58 void
59 __intel_memory_region_put_block_buddy(struct i915_buddy_block *block)
60 {
61 	struct list_head blocks;
62 
63 	INIT_LIST_HEAD(&blocks);
64 	list_add(&block->link, &blocks);
65 	__intel_memory_region_put_pages_buddy(block->private, &blocks);
66 }
67 
68 int
69 __intel_memory_region_get_pages_buddy(struct intel_memory_region *mem,
70 				      resource_size_t size,
71 				      unsigned int flags,
72 				      struct list_head *blocks)
73 {
74 	unsigned int min_order = 0;
75 	unsigned long n_pages;
76 
77 	GEM_BUG_ON(!IS_ALIGNED(size, mem->mm.chunk_size));
78 	GEM_BUG_ON(!list_empty(blocks));
79 
80 	if (flags & I915_ALLOC_MIN_PAGE_SIZE) {
81 		min_order = ilog2(mem->min_page_size) -
82 			    ilog2(mem->mm.chunk_size);
83 	}
84 
85 	if (flags & I915_ALLOC_CONTIGUOUS) {
86 		size = roundup_pow_of_two(size);
87 		min_order = ilog2(size) - ilog2(mem->mm.chunk_size);
88 	}
89 
90 	if (size > mem->mm.size)
91 		return -E2BIG;
92 
93 	n_pages = size >> ilog2(mem->mm.chunk_size);
94 
95 	mutex_lock(&mem->mm_lock);
96 
97 	do {
98 		struct i915_buddy_block *block;
99 		unsigned int order;
100 
101 		order = fls(n_pages) - 1;
102 		GEM_BUG_ON(order > mem->mm.max_order);
103 		GEM_BUG_ON(order < min_order);
104 
105 		do {
106 			block = i915_buddy_alloc(&mem->mm, order);
107 			if (!IS_ERR(block))
108 				break;
109 
110 			if (order-- == min_order)
111 				goto err_free_blocks;
112 		} while (1);
113 
114 		n_pages -= BIT(order);
115 
116 		block->private = mem;
117 		list_add_tail(&block->link, blocks);
118 
119 		if (!n_pages)
120 			break;
121 	} while (1);
122 
123 	mem->avail -= size;
124 	mutex_unlock(&mem->mm_lock);
125 	return 0;
126 
127 err_free_blocks:
128 	intel_memory_region_free_pages(mem, blocks);
129 	mutex_unlock(&mem->mm_lock);
130 	return -ENXIO;
131 }
132 
133 struct i915_buddy_block *
134 __intel_memory_region_get_block_buddy(struct intel_memory_region *mem,
135 				      resource_size_t size,
136 				      unsigned int flags)
137 {
138 	struct i915_buddy_block *block;
139 	LIST_HEAD(blocks);
140 	int ret;
141 
142 	ret = __intel_memory_region_get_pages_buddy(mem, size, flags, &blocks);
143 	if (ret)
144 		return ERR_PTR(ret);
145 
146 	block = list_first_entry(&blocks, typeof(*block), link);
147 	list_del_init(&block->link);
148 	return block;
149 }
150 
151 int intel_memory_region_init_buddy(struct intel_memory_region *mem)
152 {
153 	return i915_buddy_init(&mem->mm, resource_size(&mem->region),
154 			       PAGE_SIZE);
155 }
156 
157 void intel_memory_region_release_buddy(struct intel_memory_region *mem)
158 {
159 	i915_buddy_fini(&mem->mm);
160 }
161 
162 struct intel_memory_region *
163 intel_memory_region_create(struct drm_i915_private *i915,
164 			   resource_size_t start,
165 			   resource_size_t size,
166 			   resource_size_t min_page_size,
167 			   resource_size_t io_start,
168 			   const struct intel_memory_region_ops *ops)
169 {
170 	struct intel_memory_region *mem;
171 	int err;
172 
173 	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
174 	if (!mem)
175 		return ERR_PTR(-ENOMEM);
176 
177 	mem->i915 = i915;
178 	mem->region = (struct resource)DEFINE_RES_MEM(start, size);
179 	mem->io_start = io_start;
180 	mem->min_page_size = min_page_size;
181 	mem->ops = ops;
182 	mem->total = size;
183 	mem->avail = mem->total;
184 
185 	mutex_init(&mem->objects.lock);
186 	INIT_LIST_HEAD(&mem->objects.list);
187 	INIT_LIST_HEAD(&mem->objects.purgeable);
188 
189 	mutex_init(&mem->mm_lock);
190 
191 	if (ops->init) {
192 		err = ops->init(mem);
193 		if (err)
194 			goto err_free;
195 	}
196 
197 	kref_init(&mem->kref);
198 	return mem;
199 
200 err_free:
201 	kfree(mem);
202 	return ERR_PTR(err);
203 }
204 
205 void intel_memory_region_set_name(struct intel_memory_region *mem,
206 				  const char *fmt, ...)
207 {
208 	va_list ap;
209 
210 	va_start(ap, fmt);
211 	vsnprintf(mem->name, sizeof(mem->name), fmt, ap);
212 	va_end(ap);
213 }
214 
215 static void __intel_memory_region_destroy(struct kref *kref)
216 {
217 	struct intel_memory_region *mem =
218 		container_of(kref, typeof(*mem), kref);
219 
220 	if (mem->ops->release)
221 		mem->ops->release(mem);
222 
223 	mutex_destroy(&mem->mm_lock);
224 	mutex_destroy(&mem->objects.lock);
225 	kfree(mem);
226 }
227 
228 struct intel_memory_region *
229 intel_memory_region_get(struct intel_memory_region *mem)
230 {
231 	kref_get(&mem->kref);
232 	return mem;
233 }
234 
235 void intel_memory_region_put(struct intel_memory_region *mem)
236 {
237 	kref_put(&mem->kref, __intel_memory_region_destroy);
238 }
239 
240 /* Global memory region registration -- only slight layer inversions! */
241 
242 int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
243 {
244 	int err, i;
245 
246 	for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
247 		struct intel_memory_region *mem = ERR_PTR(-ENODEV);
248 		u32 type;
249 
250 		if (!HAS_REGION(i915, BIT(i)))
251 			continue;
252 
253 		type = MEMORY_TYPE_FROM_REGION(intel_region_map[i]);
254 		switch (type) {
255 		case INTEL_MEMORY_SYSTEM:
256 			mem = i915_gem_shmem_setup(i915);
257 			break;
258 		case INTEL_MEMORY_STOLEN:
259 			mem = i915_gem_stolen_setup(i915);
260 			break;
261 		case INTEL_MEMORY_LOCAL:
262 			mem = intel_setup_fake_lmem(i915);
263 			break;
264 		}
265 
266 		if (IS_ERR(mem)) {
267 			err = PTR_ERR(mem);
268 			drm_err(&i915->drm,
269 				"Failed to setup region(%d) type=%d\n",
270 				err, type);
271 			goto out_cleanup;
272 		}
273 
274 		mem->id = intel_region_map[i];
275 		mem->type = type;
276 		mem->instance = MEMORY_INSTANCE_FROM_REGION(intel_region_map[i]);
277 
278 		i915->mm.regions[i] = mem;
279 	}
280 
281 	return 0;
282 
283 out_cleanup:
284 	intel_memory_regions_driver_release(i915);
285 	return err;
286 }
287 
288 void intel_memory_regions_driver_release(struct drm_i915_private *i915)
289 {
290 	int i;
291 
292 	for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
293 		struct intel_memory_region *region =
294 			fetch_and_zero(&i915->mm.regions[i]);
295 
296 		if (region)
297 			intel_memory_region_put(region);
298 	}
299 }
300 
301 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
302 #include "selftests/intel_memory_region.c"
303 #include "selftests/mock_region.c"
304 #endif
305