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
31struct 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
39enum 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
53static 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
61struct mlxsw_sp1_kvdl_part {
62	struct mlxsw_sp1_kvdl_part_info info;
63	unsigned long usage[];	/* Entries */
64};
65
66struct mlxsw_sp1_kvdl {
67	struct mlxsw_sp1_kvdl_part *parts[MLXSW_SP1_KVDL_PARTS_INFO_LEN];
68};
69
70static struct mlxsw_sp1_kvdl_part *
71mlxsw_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
88static struct mlxsw_sp1_kvdl_part *
89mlxsw_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
104static u32
105mlxsw_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
111static unsigned int
112mlxsw_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
118static 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
136static 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
146static 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
164static 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
177static 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
195static 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
207static struct mlxsw_sp1_kvdl_part *
208mlxsw_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
239static void mlxsw_sp1_kvdl_part_fini(struct mlxsw_sp1_kvdl_part *part)
240{
241	kfree(part);
242}
243
244static 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
263err_kvdl_part_init:
264	for (i--; i >= 0; i--)
265		mlxsw_sp1_kvdl_part_fini(kvdl->parts[i]);
266	return err;
267}
268
269static 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
277static 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
293static 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
305static 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
314static 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
323static 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
332static 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
360static 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
376const 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
385int 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