1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /* Copyright (c) 2018 Mellanox Technologies. All rights reserved */
3 
4 #include <linux/kernel.h>
5 #include <linux/bitops.h>
6 
7 #include "spectrum.h"
8 
9 #define MLXSW_SP1_KVDL_SINGLE_BASE 0
10 #define MLXSW_SP1_KVDL_SINGLE_SIZE 16384
11 #define MLXSW_SP1_KVDL_SINGLE_END \
12 	(MLXSW_SP1_KVDL_SINGLE_SIZE + MLXSW_SP1_KVDL_SINGLE_BASE - 1)
13 
14 #define MLXSW_SP1_KVDL_CHUNKS_BASE \
15 	(MLXSW_SP1_KVDL_SINGLE_BASE + MLXSW_SP1_KVDL_SINGLE_SIZE)
16 #define MLXSW_SP1_KVDL_CHUNKS_SIZE 49152
17 #define MLXSW_SP1_KVDL_CHUNKS_END \
18 	(MLXSW_SP1_KVDL_CHUNKS_SIZE + MLXSW_SP1_KVDL_CHUNKS_BASE - 1)
19 
20 #define MLXSW_SP1_KVDL_LARGE_CHUNKS_BASE \
21 	(MLXSW_SP1_KVDL_CHUNKS_BASE + MLXSW_SP1_KVDL_CHUNKS_SIZE)
22 #define MLXSW_SP1_KVDL_LARGE_CHUNKS_SIZE \
23 	(MLXSW_SP_KVD_LINEAR_SIZE - MLXSW_SP1_KVDL_LARGE_CHUNKS_BASE)
24 #define MLXSW_SP1_KVDL_LARGE_CHUNKS_END \
25 	(MLXSW_SP1_KVDL_LARGE_CHUNKS_SIZE + MLXSW_SP1_KVDL_LARGE_CHUNKS_BASE - 1)
26 
27 #define MLXSW_SP1_KVDL_SINGLE_ALLOC_SIZE 1
28 #define MLXSW_SP1_KVDL_CHUNKS_ALLOC_SIZE 32
29 #define MLXSW_SP1_KVDL_LARGE_CHUNKS_ALLOC_SIZE 512
30 
31 struct mlxsw_sp1_kvdl_part_info {
32 	unsigned int part_index;
33 	unsigned int start_index;
34 	unsigned int end_index;
35 	unsigned int alloc_size;
36 	enum mlxsw_sp_resource_id resource_id;
37 };
38 
39 enum mlxsw_sp1_kvdl_part_id {
40 	MLXSW_SP1_KVDL_PART_ID_SINGLE,
41 	MLXSW_SP1_KVDL_PART_ID_CHUNKS,
42 	MLXSW_SP1_KVDL_PART_ID_LARGE_CHUNKS,
43 };
44 
45 #define MLXSW_SP1_KVDL_PART_INFO(id)				\
46 [MLXSW_SP1_KVDL_PART_ID_##id] = {				\
47 	.start_index = MLXSW_SP1_KVDL_##id##_BASE,		\
48 	.end_index = MLXSW_SP1_KVDL_##id##_END,			\
49 	.alloc_size = MLXSW_SP1_KVDL_##id##_ALLOC_SIZE,		\
50 	.resource_id = MLXSW_SP_RESOURCE_KVD_LINEAR_##id,	\
51 }
52 
53 static const struct mlxsw_sp1_kvdl_part_info mlxsw_sp1_kvdl_parts_info[] = {
54 	MLXSW_SP1_KVDL_PART_INFO(SINGLE),
55 	MLXSW_SP1_KVDL_PART_INFO(CHUNKS),
56 	MLXSW_SP1_KVDL_PART_INFO(LARGE_CHUNKS),
57 };
58 
59 #define MLXSW_SP1_KVDL_PARTS_INFO_LEN ARRAY_SIZE(mlxsw_sp1_kvdl_parts_info)
60 
61 struct mlxsw_sp1_kvdl_part {
62 	struct mlxsw_sp1_kvdl_part_info info;
63 	unsigned long usage[];	/* Entries */
64 };
65 
66 struct mlxsw_sp1_kvdl {
67 	struct mlxsw_sp1_kvdl_part *parts[MLXSW_SP1_KVDL_PARTS_INFO_LEN];
68 };
69 
70 static struct mlxsw_sp1_kvdl_part *
71 mlxsw_sp1_kvdl_alloc_size_part(struct mlxsw_sp1_kvdl *kvdl,
72 			       unsigned int alloc_size)
73 {
74 	struct mlxsw_sp1_kvdl_part *part, *min_part = NULL;
75 	int i;
76 
77 	for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++) {
78 		part = kvdl->parts[i];
79 		if (alloc_size <= part->info.alloc_size &&
80 		    (!min_part ||
81 		     part->info.alloc_size <= min_part->info.alloc_size))
82 			min_part = part;
83 	}
84 
85 	return min_part ?: ERR_PTR(-ENOBUFS);
86 }
87 
88 static struct mlxsw_sp1_kvdl_part *
89 mlxsw_sp1_kvdl_index_part(struct mlxsw_sp1_kvdl *kvdl, u32 kvdl_index)
90 {
91 	struct mlxsw_sp1_kvdl_part *part;
92 	int i;
93 
94 	for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++) {
95 		part = kvdl->parts[i];
96 		if (kvdl_index >= part->info.start_index &&
97 		    kvdl_index <= part->info.end_index)
98 			return part;
99 	}
100 
101 	return ERR_PTR(-EINVAL);
102 }
103 
104 static u32
105 mlxsw_sp1_kvdl_to_kvdl_index(const struct mlxsw_sp1_kvdl_part_info *info,
106 			     unsigned int entry_index)
107 {
108 	return info->start_index + entry_index * info->alloc_size;
109 }
110 
111 static unsigned int
112 mlxsw_sp1_kvdl_to_entry_index(const struct mlxsw_sp1_kvdl_part_info *info,
113 			      u32 kvdl_index)
114 {
115 	return (kvdl_index - info->start_index) / info->alloc_size;
116 }
117 
118 static int mlxsw_sp1_kvdl_part_alloc(struct mlxsw_sp1_kvdl_part *part,
119 				     u32 *p_kvdl_index)
120 {
121 	const struct mlxsw_sp1_kvdl_part_info *info = &part->info;
122 	unsigned int entry_index, nr_entries;
123 
124 	nr_entries = (info->end_index - info->start_index + 1) /
125 		     info->alloc_size;
126 	entry_index = find_first_zero_bit(part->usage, nr_entries);
127 	if (entry_index == nr_entries)
128 		return -ENOBUFS;
129 	__set_bit(entry_index, part->usage);
130 
131 	*p_kvdl_index = mlxsw_sp1_kvdl_to_kvdl_index(info, entry_index);
132 
133 	return 0;
134 }
135 
136 static void mlxsw_sp1_kvdl_part_free(struct mlxsw_sp1_kvdl_part *part,
137 				     u32 kvdl_index)
138 {
139 	const struct mlxsw_sp1_kvdl_part_info *info = &part->info;
140 	unsigned int entry_index;
141 
142 	entry_index = mlxsw_sp1_kvdl_to_entry_index(info, kvdl_index);
143 	__clear_bit(entry_index, part->usage);
144 }
145 
146 static int mlxsw_sp1_kvdl_alloc(struct mlxsw_sp *mlxsw_sp, void *priv,
147 				enum mlxsw_sp_kvdl_entry_type type,
148 				unsigned int entry_count,
149 				u32 *p_entry_index)
150 {
151 	struct mlxsw_sp1_kvdl *kvdl = priv;
152 	struct mlxsw_sp1_kvdl_part *part;
153 
154 	/* Find partition with smallest allocation size satisfying the
155 	 * requested size.
156 	 */
157 	part = mlxsw_sp1_kvdl_alloc_size_part(kvdl, entry_count);
158 	if (IS_ERR(part))
159 		return PTR_ERR(part);
160 
161 	return mlxsw_sp1_kvdl_part_alloc(part, p_entry_index);
162 }
163 
164 static void mlxsw_sp1_kvdl_free(struct mlxsw_sp *mlxsw_sp, void *priv,
165 				enum mlxsw_sp_kvdl_entry_type type,
166 				unsigned int entry_count, int entry_index)
167 {
168 	struct mlxsw_sp1_kvdl *kvdl = priv;
169 	struct mlxsw_sp1_kvdl_part *part;
170 
171 	part = mlxsw_sp1_kvdl_index_part(kvdl, entry_index);
172 	if (IS_ERR(part))
173 		return;
174 	mlxsw_sp1_kvdl_part_free(part, entry_index);
175 }
176 
177 static int mlxsw_sp1_kvdl_alloc_size_query(struct mlxsw_sp *mlxsw_sp,
178 					   void *priv,
179 					   enum mlxsw_sp_kvdl_entry_type type,
180 					   unsigned int entry_count,
181 					   unsigned int *p_alloc_size)
182 {
183 	struct mlxsw_sp1_kvdl *kvdl = priv;
184 	struct mlxsw_sp1_kvdl_part *part;
185 
186 	part = mlxsw_sp1_kvdl_alloc_size_part(kvdl, entry_count);
187 	if (IS_ERR(part))
188 		return PTR_ERR(part);
189 
190 	*p_alloc_size = part->info.alloc_size;
191 
192 	return 0;
193 }
194 
195 static void mlxsw_sp1_kvdl_part_update(struct mlxsw_sp1_kvdl_part *part,
196 				       struct mlxsw_sp1_kvdl_part *part_prev,
197 				       unsigned int size)
198 {
199 	if (!part_prev) {
200 		part->info.end_index = size - 1;
201 	} else {
202 		part->info.start_index = part_prev->info.end_index + 1;
203 		part->info.end_index = part->info.start_index + size - 1;
204 	}
205 }
206 
207 static struct mlxsw_sp1_kvdl_part *
208 mlxsw_sp1_kvdl_part_init(struct mlxsw_sp *mlxsw_sp,
209 			 const struct mlxsw_sp1_kvdl_part_info *info,
210 			 struct mlxsw_sp1_kvdl_part *part_prev)
211 {
212 	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
213 	struct mlxsw_sp1_kvdl_part *part;
214 	bool need_update = true;
215 	unsigned int nr_entries;
216 	u64 resource_size;
217 	int err;
218 
219 	err = devl_resource_size_get(devlink, info->resource_id,
220 				     &resource_size);
221 	if (err) {
222 		need_update = false;
223 		resource_size = info->end_index - info->start_index + 1;
224 	}
225 
226 	nr_entries = div_u64(resource_size, info->alloc_size);
227 	part = kzalloc(struct_size(part, usage, BITS_TO_LONGS(nr_entries)),
228 		       GFP_KERNEL);
229 	if (!part)
230 		return ERR_PTR(-ENOMEM);
231 
232 	memcpy(&part->info, info, sizeof(part->info));
233 
234 	if (need_update)
235 		mlxsw_sp1_kvdl_part_update(part, part_prev, resource_size);
236 	return part;
237 }
238 
239 static void mlxsw_sp1_kvdl_part_fini(struct mlxsw_sp1_kvdl_part *part)
240 {
241 	kfree(part);
242 }
243 
244 static int mlxsw_sp1_kvdl_parts_init(struct mlxsw_sp *mlxsw_sp,
245 				     struct mlxsw_sp1_kvdl *kvdl)
246 {
247 	const struct mlxsw_sp1_kvdl_part_info *info;
248 	struct mlxsw_sp1_kvdl_part *part_prev = NULL;
249 	int err, i;
250 
251 	for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++) {
252 		info = &mlxsw_sp1_kvdl_parts_info[i];
253 		kvdl->parts[i] = mlxsw_sp1_kvdl_part_init(mlxsw_sp, info,
254 							  part_prev);
255 		if (IS_ERR(kvdl->parts[i])) {
256 			err = PTR_ERR(kvdl->parts[i]);
257 			goto err_kvdl_part_init;
258 		}
259 		part_prev = kvdl->parts[i];
260 	}
261 	return 0;
262 
263 err_kvdl_part_init:
264 	for (i--; i >= 0; i--)
265 		mlxsw_sp1_kvdl_part_fini(kvdl->parts[i]);
266 	return err;
267 }
268 
269 static void mlxsw_sp1_kvdl_parts_fini(struct mlxsw_sp1_kvdl *kvdl)
270 {
271 	int i;
272 
273 	for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++)
274 		mlxsw_sp1_kvdl_part_fini(kvdl->parts[i]);
275 }
276 
277 static u64 mlxsw_sp1_kvdl_part_occ(struct mlxsw_sp1_kvdl_part *part)
278 {
279 	const struct mlxsw_sp1_kvdl_part_info *info = &part->info;
280 	unsigned int nr_entries;
281 	int bit = -1;
282 	u64 occ = 0;
283 
284 	nr_entries = (info->end_index -
285 		      info->start_index + 1) /
286 		      info->alloc_size;
287 	while ((bit = find_next_bit(part->usage, nr_entries, bit + 1))
288 		< nr_entries)
289 		occ += info->alloc_size;
290 	return occ;
291 }
292 
293 static u64 mlxsw_sp1_kvdl_occ_get(void *priv)
294 {
295 	const struct mlxsw_sp1_kvdl *kvdl = priv;
296 	u64 occ = 0;
297 	int i;
298 
299 	for (i = 0; i < MLXSW_SP1_KVDL_PARTS_INFO_LEN; i++)
300 		occ += mlxsw_sp1_kvdl_part_occ(kvdl->parts[i]);
301 
302 	return occ;
303 }
304 
305 static u64 mlxsw_sp1_kvdl_single_occ_get(void *priv)
306 {
307 	const struct mlxsw_sp1_kvdl *kvdl = priv;
308 	struct mlxsw_sp1_kvdl_part *part;
309 
310 	part = kvdl->parts[MLXSW_SP1_KVDL_PART_ID_SINGLE];
311 	return mlxsw_sp1_kvdl_part_occ(part);
312 }
313 
314 static u64 mlxsw_sp1_kvdl_chunks_occ_get(void *priv)
315 {
316 	const struct mlxsw_sp1_kvdl *kvdl = priv;
317 	struct mlxsw_sp1_kvdl_part *part;
318 
319 	part = kvdl->parts[MLXSW_SP1_KVDL_PART_ID_CHUNKS];
320 	return mlxsw_sp1_kvdl_part_occ(part);
321 }
322 
323 static u64 mlxsw_sp1_kvdl_large_chunks_occ_get(void *priv)
324 {
325 	const struct mlxsw_sp1_kvdl *kvdl = priv;
326 	struct mlxsw_sp1_kvdl_part *part;
327 
328 	part = kvdl->parts[MLXSW_SP1_KVDL_PART_ID_LARGE_CHUNKS];
329 	return mlxsw_sp1_kvdl_part_occ(part);
330 }
331 
332 static int mlxsw_sp1_kvdl_init(struct mlxsw_sp *mlxsw_sp, void *priv)
333 {
334 	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
335 	struct mlxsw_sp1_kvdl *kvdl = priv;
336 	int err;
337 
338 	err = mlxsw_sp1_kvdl_parts_init(mlxsw_sp, kvdl);
339 	if (err)
340 		return err;
341 	devl_resource_occ_get_register(devlink,
342 				       MLXSW_SP_RESOURCE_KVD_LINEAR,
343 				       mlxsw_sp1_kvdl_occ_get,
344 				       kvdl);
345 	devl_resource_occ_get_register(devlink,
346 				       MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE,
347 				       mlxsw_sp1_kvdl_single_occ_get,
348 				       kvdl);
349 	devl_resource_occ_get_register(devlink,
350 				       MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS,
351 				       mlxsw_sp1_kvdl_chunks_occ_get,
352 				       kvdl);
353 	devl_resource_occ_get_register(devlink,
354 				       MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS,
355 				       mlxsw_sp1_kvdl_large_chunks_occ_get,
356 				       kvdl);
357 	return 0;
358 }
359 
360 static void mlxsw_sp1_kvdl_fini(struct mlxsw_sp *mlxsw_sp, void *priv)
361 {
362 	struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
363 	struct mlxsw_sp1_kvdl *kvdl = priv;
364 
365 	devl_resource_occ_get_unregister(devlink,
366 					 MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS);
367 	devl_resource_occ_get_unregister(devlink,
368 					 MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS);
369 	devl_resource_occ_get_unregister(devlink,
370 					 MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE);
371 	devl_resource_occ_get_unregister(devlink,
372 					 MLXSW_SP_RESOURCE_KVD_LINEAR);
373 	mlxsw_sp1_kvdl_parts_fini(kvdl);
374 }
375 
376 const struct mlxsw_sp_kvdl_ops mlxsw_sp1_kvdl_ops = {
377 	.priv_size = sizeof(struct mlxsw_sp1_kvdl),
378 	.init = mlxsw_sp1_kvdl_init,
379 	.fini = mlxsw_sp1_kvdl_fini,
380 	.alloc = mlxsw_sp1_kvdl_alloc,
381 	.free = mlxsw_sp1_kvdl_free,
382 	.alloc_size_query = mlxsw_sp1_kvdl_alloc_size_query,
383 };
384 
385 int mlxsw_sp1_kvdl_resources_register(struct mlxsw_core *mlxsw_core)
386 {
387 	struct devlink *devlink = priv_to_devlink(mlxsw_core);
388 	static struct devlink_resource_size_params size_params;
389 	u32 kvdl_max_size;
390 	int err;
391 
392 	kvdl_max_size = MLXSW_CORE_RES_GET(mlxsw_core, KVD_SIZE) -
393 			MLXSW_CORE_RES_GET(mlxsw_core, KVD_SINGLE_MIN_SIZE) -
394 			MLXSW_CORE_RES_GET(mlxsw_core, KVD_DOUBLE_MIN_SIZE);
395 
396 	devlink_resource_size_params_init(&size_params, 0, kvdl_max_size,
397 					  MLXSW_SP1_KVDL_SINGLE_ALLOC_SIZE,
398 					  DEVLINK_RESOURCE_UNIT_ENTRY);
399 	err = devl_resource_register(devlink, MLXSW_SP_RESOURCE_NAME_KVD_LINEAR_SINGLES,
400 				     MLXSW_SP1_KVDL_SINGLE_SIZE,
401 				     MLXSW_SP_RESOURCE_KVD_LINEAR_SINGLE,
402 				     MLXSW_SP_RESOURCE_KVD_LINEAR,
403 				     &size_params);
404 	if (err)
405 		return err;
406 
407 	devlink_resource_size_params_init(&size_params, 0, kvdl_max_size,
408 					  MLXSW_SP1_KVDL_CHUNKS_ALLOC_SIZE,
409 					  DEVLINK_RESOURCE_UNIT_ENTRY);
410 	err = devl_resource_register(devlink, MLXSW_SP_RESOURCE_NAME_KVD_LINEAR_CHUNKS,
411 				     MLXSW_SP1_KVDL_CHUNKS_SIZE,
412 				     MLXSW_SP_RESOURCE_KVD_LINEAR_CHUNKS,
413 				     MLXSW_SP_RESOURCE_KVD_LINEAR,
414 				     &size_params);
415 	if (err)
416 		return err;
417 
418 	devlink_resource_size_params_init(&size_params, 0, kvdl_max_size,
419 					  MLXSW_SP1_KVDL_LARGE_CHUNKS_ALLOC_SIZE,
420 					  DEVLINK_RESOURCE_UNIT_ENTRY);
421 	err = devl_resource_register(devlink, MLXSW_SP_RESOURCE_NAME_KVD_LINEAR_LARGE_CHUNKS,
422 				     MLXSW_SP1_KVDL_LARGE_CHUNKS_SIZE,
423 				     MLXSW_SP_RESOURCE_KVD_LINEAR_LARGE_CHUNKS,
424 				     MLXSW_SP_RESOURCE_KVD_LINEAR,
425 				     &size_params);
426 	return err;
427 }
428