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 *
mlxsw_sp1_kvdl_alloc_size_part(struct mlxsw_sp1_kvdl * kvdl,unsigned int alloc_size)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 *
mlxsw_sp1_kvdl_index_part(struct mlxsw_sp1_kvdl * kvdl,u32 kvdl_index)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
mlxsw_sp1_kvdl_to_kvdl_index(const struct mlxsw_sp1_kvdl_part_info * info,unsigned int entry_index)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
mlxsw_sp1_kvdl_to_entry_index(const struct mlxsw_sp1_kvdl_part_info * info,u32 kvdl_index)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
mlxsw_sp1_kvdl_part_alloc(struct mlxsw_sp1_kvdl_part * part,u32 * p_kvdl_index)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
mlxsw_sp1_kvdl_part_free(struct mlxsw_sp1_kvdl_part * part,u32 kvdl_index)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
mlxsw_sp1_kvdl_alloc(struct mlxsw_sp * mlxsw_sp,void * priv,enum mlxsw_sp_kvdl_entry_type type,unsigned int entry_count,u32 * p_entry_index)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
mlxsw_sp1_kvdl_free(struct mlxsw_sp * mlxsw_sp,void * priv,enum mlxsw_sp_kvdl_entry_type type,unsigned int entry_count,int entry_index)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
mlxsw_sp1_kvdl_alloc_size_query(struct mlxsw_sp * mlxsw_sp,void * priv,enum mlxsw_sp_kvdl_entry_type type,unsigned int entry_count,unsigned int * p_alloc_size)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
mlxsw_sp1_kvdl_part_update(struct mlxsw_sp1_kvdl_part * part,struct mlxsw_sp1_kvdl_part * part_prev,unsigned int size)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 *
mlxsw_sp1_kvdl_part_init(struct mlxsw_sp * mlxsw_sp,const struct mlxsw_sp1_kvdl_part_info * info,struct mlxsw_sp1_kvdl_part * part_prev)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
mlxsw_sp1_kvdl_part_fini(struct mlxsw_sp1_kvdl_part * part)239 static void mlxsw_sp1_kvdl_part_fini(struct mlxsw_sp1_kvdl_part *part)
240 {
241 kfree(part);
242 }
243
mlxsw_sp1_kvdl_parts_init(struct mlxsw_sp * mlxsw_sp,struct mlxsw_sp1_kvdl * kvdl)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
mlxsw_sp1_kvdl_parts_fini(struct mlxsw_sp1_kvdl * kvdl)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
mlxsw_sp1_kvdl_part_occ(struct mlxsw_sp1_kvdl_part * part)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
mlxsw_sp1_kvdl_occ_get(void * priv)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
mlxsw_sp1_kvdl_single_occ_get(void * priv)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
mlxsw_sp1_kvdl_chunks_occ_get(void * priv)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
mlxsw_sp1_kvdl_large_chunks_occ_get(void * priv)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
mlxsw_sp1_kvdl_init(struct mlxsw_sp * mlxsw_sp,void * priv)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
mlxsw_sp1_kvdl_fini(struct mlxsw_sp * mlxsw_sp,void * priv)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
mlxsw_sp1_kvdl_resources_register(struct mlxsw_core * mlxsw_core)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