1 // SPDX-License-Identifier: BSD-3-Clause-Clear
2 /*
3 * Copyright (c) 2019-2020 The Linux Foundation. All rights reserved.
4 * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved.
5 */
6
7 #include "core.h"
8 #include "debug.h"
9
10 #define ATH11K_DB_MAGIC_VALUE 0xdeadbeaf
11
ath11k_dbring_validate_buffer(struct ath11k * ar,void * buffer,u32 size)12 int ath11k_dbring_validate_buffer(struct ath11k *ar, void *buffer, u32 size)
13 {
14 u32 *temp;
15 int idx;
16
17 size = size >> 2;
18
19 for (idx = 0, temp = buffer; idx < size; idx++, temp++) {
20 if (*temp == ATH11K_DB_MAGIC_VALUE)
21 return -EINVAL;
22 }
23
24 return 0;
25 }
26
ath11k_dbring_fill_magic_value(struct ath11k * ar,void * buffer,u32 size)27 static void ath11k_dbring_fill_magic_value(struct ath11k *ar,
28 void *buffer, u32 size)
29 {
30 /* memset32 function fills buffer payload with the ATH11K_DB_MAGIC_VALUE
31 * and the variable size is expected to be the number of u32 values
32 * to be stored, not the number of bytes.
33 */
34 size = size / sizeof(u32);
35
36 memset32(buffer, ATH11K_DB_MAGIC_VALUE, size);
37 }
38
ath11k_dbring_bufs_replenish(struct ath11k * ar,struct ath11k_dbring * ring,struct ath11k_dbring_element * buff,enum wmi_direct_buffer_module id)39 static int ath11k_dbring_bufs_replenish(struct ath11k *ar,
40 struct ath11k_dbring *ring,
41 struct ath11k_dbring_element *buff,
42 enum wmi_direct_buffer_module id)
43 {
44 struct ath11k_base *ab = ar->ab;
45 struct hal_srng *srng;
46 dma_addr_t paddr;
47 void *ptr_aligned, *ptr_unaligned, *desc;
48 int ret;
49 int buf_id;
50 u32 cookie;
51
52 srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
53
54 lockdep_assert_held(&srng->lock);
55
56 ath11k_hal_srng_access_begin(ab, srng);
57
58 ptr_unaligned = buff->payload;
59 ptr_aligned = PTR_ALIGN(ptr_unaligned, ring->buf_align);
60 ath11k_dbring_fill_magic_value(ar, ptr_aligned, ring->buf_sz);
61 paddr = dma_map_single(ab->dev, ptr_aligned, ring->buf_sz,
62 DMA_FROM_DEVICE);
63
64 ret = dma_mapping_error(ab->dev, paddr);
65 if (ret)
66 goto err;
67
68 spin_lock_bh(&ring->idr_lock);
69 buf_id = idr_alloc(&ring->bufs_idr, buff, 0, ring->bufs_max, GFP_ATOMIC);
70 spin_unlock_bh(&ring->idr_lock);
71 if (buf_id < 0) {
72 ret = -ENOBUFS;
73 goto err_dma_unmap;
74 }
75
76 desc = ath11k_hal_srng_src_get_next_entry(ab, srng);
77 if (!desc) {
78 ret = -ENOENT;
79 goto err_idr_remove;
80 }
81
82 buff->paddr = paddr;
83
84 cookie = FIELD_PREP(DP_RXDMA_BUF_COOKIE_PDEV_ID, ar->pdev_idx) |
85 FIELD_PREP(DP_RXDMA_BUF_COOKIE_BUF_ID, buf_id);
86
87 ath11k_hal_rx_buf_addr_info_set(desc, paddr, cookie, 0);
88
89 ath11k_debugfs_add_dbring_entry(ar, id, ATH11K_DBG_DBR_EVENT_REPLENISH, srng);
90 ath11k_hal_srng_access_end(ab, srng);
91
92 return 0;
93
94 err_idr_remove:
95 spin_lock_bh(&ring->idr_lock);
96 idr_remove(&ring->bufs_idr, buf_id);
97 spin_unlock_bh(&ring->idr_lock);
98 err_dma_unmap:
99 dma_unmap_single(ab->dev, paddr, ring->buf_sz,
100 DMA_FROM_DEVICE);
101 err:
102 ath11k_hal_srng_access_end(ab, srng);
103 return ret;
104 }
105
ath11k_dbring_fill_bufs(struct ath11k * ar,struct ath11k_dbring * ring,enum wmi_direct_buffer_module id)106 static int ath11k_dbring_fill_bufs(struct ath11k *ar,
107 struct ath11k_dbring *ring,
108 enum wmi_direct_buffer_module id)
109 {
110 struct ath11k_dbring_element *buff;
111 struct hal_srng *srng;
112 int num_remain, req_entries, num_free;
113 u32 align;
114 int size, ret;
115
116 srng = &ar->ab->hal.srng_list[ring->refill_srng.ring_id];
117
118 spin_lock_bh(&srng->lock);
119
120 num_free = ath11k_hal_srng_src_num_free(ar->ab, srng, true);
121 req_entries = min(num_free, ring->bufs_max);
122 num_remain = req_entries;
123 align = ring->buf_align;
124 size = ring->buf_sz + align - 1;
125
126 while (num_remain > 0) {
127 buff = kzalloc(sizeof(*buff), GFP_ATOMIC);
128 if (!buff)
129 break;
130
131 buff->payload = kzalloc(size, GFP_ATOMIC);
132 if (!buff->payload) {
133 kfree(buff);
134 break;
135 }
136 ret = ath11k_dbring_bufs_replenish(ar, ring, buff, id);
137 if (ret) {
138 ath11k_warn(ar->ab, "failed to replenish db ring num_remain %d req_ent %d\n",
139 num_remain, req_entries);
140 kfree(buff->payload);
141 kfree(buff);
142 break;
143 }
144 num_remain--;
145 }
146
147 spin_unlock_bh(&srng->lock);
148
149 return num_remain;
150 }
151
ath11k_dbring_wmi_cfg_setup(struct ath11k * ar,struct ath11k_dbring * ring,enum wmi_direct_buffer_module id)152 int ath11k_dbring_wmi_cfg_setup(struct ath11k *ar,
153 struct ath11k_dbring *ring,
154 enum wmi_direct_buffer_module id)
155 {
156 struct ath11k_wmi_pdev_dma_ring_cfg_req_cmd param = {0};
157 int ret;
158
159 if (id >= WMI_DIRECT_BUF_MAX)
160 return -EINVAL;
161
162 param.pdev_id = DP_SW2HW_MACID(ring->pdev_id);
163 param.module_id = id;
164 param.base_paddr_lo = lower_32_bits(ring->refill_srng.paddr);
165 param.base_paddr_hi = upper_32_bits(ring->refill_srng.paddr);
166 param.head_idx_paddr_lo = lower_32_bits(ring->hp_addr);
167 param.head_idx_paddr_hi = upper_32_bits(ring->hp_addr);
168 param.tail_idx_paddr_lo = lower_32_bits(ring->tp_addr);
169 param.tail_idx_paddr_hi = upper_32_bits(ring->tp_addr);
170 param.num_elems = ring->bufs_max;
171 param.buf_size = ring->buf_sz;
172 param.num_resp_per_event = ring->num_resp_per_event;
173 param.event_timeout_ms = ring->event_timeout_ms;
174
175 ret = ath11k_wmi_pdev_dma_ring_cfg(ar, ¶m);
176 if (ret) {
177 ath11k_warn(ar->ab, "failed to setup db ring cfg\n");
178 return ret;
179 }
180
181 return 0;
182 }
183
ath11k_dbring_set_cfg(struct ath11k * ar,struct ath11k_dbring * ring,u32 num_resp_per_event,u32 event_timeout_ms,int (* handler)(struct ath11k *,struct ath11k_dbring_data *))184 int ath11k_dbring_set_cfg(struct ath11k *ar, struct ath11k_dbring *ring,
185 u32 num_resp_per_event, u32 event_timeout_ms,
186 int (*handler)(struct ath11k *,
187 struct ath11k_dbring_data *))
188 {
189 if (WARN_ON(!ring))
190 return -EINVAL;
191
192 ring->num_resp_per_event = num_resp_per_event;
193 ring->event_timeout_ms = event_timeout_ms;
194 ring->handler = handler;
195
196 return 0;
197 }
198
ath11k_dbring_buf_setup(struct ath11k * ar,struct ath11k_dbring * ring,struct ath11k_dbring_cap * db_cap)199 int ath11k_dbring_buf_setup(struct ath11k *ar,
200 struct ath11k_dbring *ring,
201 struct ath11k_dbring_cap *db_cap)
202 {
203 struct ath11k_base *ab = ar->ab;
204 struct hal_srng *srng;
205 int ret;
206
207 srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
208 ring->bufs_max = ring->refill_srng.size /
209 ath11k_hal_srng_get_entrysize(ab, HAL_RXDMA_DIR_BUF);
210
211 ring->buf_sz = db_cap->min_buf_sz;
212 ring->buf_align = db_cap->min_buf_align;
213 ring->pdev_id = db_cap->pdev_id;
214 ring->hp_addr = ath11k_hal_srng_get_hp_addr(ar->ab, srng);
215 ring->tp_addr = ath11k_hal_srng_get_tp_addr(ar->ab, srng);
216
217 ret = ath11k_dbring_fill_bufs(ar, ring, db_cap->id);
218
219 return ret;
220 }
221
ath11k_dbring_srng_setup(struct ath11k * ar,struct ath11k_dbring * ring,int ring_num,int num_entries)222 int ath11k_dbring_srng_setup(struct ath11k *ar, struct ath11k_dbring *ring,
223 int ring_num, int num_entries)
224 {
225 int ret;
226
227 ret = ath11k_dp_srng_setup(ar->ab, &ring->refill_srng, HAL_RXDMA_DIR_BUF,
228 ring_num, ar->pdev_idx, num_entries);
229 if (ret < 0) {
230 ath11k_warn(ar->ab, "failed to setup srng: %d ring_id %d\n",
231 ret, ring_num);
232 goto err;
233 }
234
235 return 0;
236 err:
237 ath11k_dp_srng_cleanup(ar->ab, &ring->refill_srng);
238 return ret;
239 }
240
ath11k_dbring_get_cap(struct ath11k_base * ab,u8 pdev_idx,enum wmi_direct_buffer_module id,struct ath11k_dbring_cap * db_cap)241 int ath11k_dbring_get_cap(struct ath11k_base *ab,
242 u8 pdev_idx,
243 enum wmi_direct_buffer_module id,
244 struct ath11k_dbring_cap *db_cap)
245 {
246 int i;
247
248 if (!ab->num_db_cap || !ab->db_caps)
249 return -ENOENT;
250
251 if (id >= WMI_DIRECT_BUF_MAX)
252 return -EINVAL;
253
254 for (i = 0; i < ab->num_db_cap; i++) {
255 if (pdev_idx == ab->db_caps[i].pdev_id &&
256 id == ab->db_caps[i].id) {
257 *db_cap = ab->db_caps[i];
258
259 return 0;
260 }
261 }
262
263 return -ENOENT;
264 }
265
ath11k_dbring_buffer_release_event(struct ath11k_base * ab,struct ath11k_dbring_buf_release_event * ev)266 int ath11k_dbring_buffer_release_event(struct ath11k_base *ab,
267 struct ath11k_dbring_buf_release_event *ev)
268 {
269 struct ath11k_dbring *ring;
270 struct hal_srng *srng;
271 struct ath11k *ar;
272 struct ath11k_dbring_element *buff;
273 struct ath11k_dbring_data handler_data;
274 struct ath11k_buffer_addr desc;
275 u8 *vaddr_unalign;
276 u32 num_entry, num_buff_reaped;
277 u8 pdev_idx, rbm, module_id;
278 u32 cookie;
279 int buf_id;
280 int size;
281 dma_addr_t paddr;
282 int ret = 0;
283
284 pdev_idx = ev->fixed.pdev_id;
285 module_id = ev->fixed.module_id;
286
287 if (pdev_idx >= ab->num_radios) {
288 ath11k_warn(ab, "Invalid pdev id %d\n", pdev_idx);
289 return -EINVAL;
290 }
291
292 if (ev->fixed.num_buf_release_entry !=
293 ev->fixed.num_meta_data_entry) {
294 ath11k_warn(ab, "Buffer entry %d mismatch meta entry %d\n",
295 ev->fixed.num_buf_release_entry,
296 ev->fixed.num_meta_data_entry);
297 return -EINVAL;
298 }
299
300 ar = ab->pdevs[pdev_idx].ar;
301
302 rcu_read_lock();
303 if (!rcu_dereference(ab->pdevs_active[pdev_idx])) {
304 ret = -EINVAL;
305 goto rcu_unlock;
306 }
307
308 switch (ev->fixed.module_id) {
309 case WMI_DIRECT_BUF_SPECTRAL:
310 ring = ath11k_spectral_get_dbring(ar);
311 break;
312 default:
313 ring = NULL;
314 ath11k_warn(ab, "Recv dma buffer release ev on unsupp module %d\n",
315 ev->fixed.module_id);
316 break;
317 }
318
319 if (!ring) {
320 ret = -EINVAL;
321 goto rcu_unlock;
322 }
323
324 srng = &ab->hal.srng_list[ring->refill_srng.ring_id];
325 num_entry = ev->fixed.num_buf_release_entry;
326 size = ring->buf_sz + ring->buf_align - 1;
327 num_buff_reaped = 0;
328
329 spin_lock_bh(&srng->lock);
330
331 while (num_buff_reaped < num_entry) {
332 desc.info0 = ev->buf_entry[num_buff_reaped].paddr_lo;
333 desc.info1 = ev->buf_entry[num_buff_reaped].paddr_hi;
334 handler_data.meta = ev->meta_data[num_buff_reaped];
335
336 num_buff_reaped++;
337
338 ath11k_hal_rx_buf_addr_info_get(&desc, &paddr, &cookie, &rbm);
339
340 buf_id = FIELD_GET(DP_RXDMA_BUF_COOKIE_BUF_ID, cookie);
341
342 spin_lock_bh(&ring->idr_lock);
343 buff = idr_find(&ring->bufs_idr, buf_id);
344 if (!buff) {
345 spin_unlock_bh(&ring->idr_lock);
346 continue;
347 }
348 idr_remove(&ring->bufs_idr, buf_id);
349 spin_unlock_bh(&ring->idr_lock);
350
351 dma_unmap_single(ab->dev, buff->paddr, ring->buf_sz,
352 DMA_FROM_DEVICE);
353
354 ath11k_debugfs_add_dbring_entry(ar, module_id,
355 ATH11K_DBG_DBR_EVENT_RX, srng);
356
357 if (ring->handler) {
358 vaddr_unalign = buff->payload;
359 handler_data.data = PTR_ALIGN(vaddr_unalign,
360 ring->buf_align);
361 handler_data.data_sz = ring->buf_sz;
362
363 ring->handler(ar, &handler_data);
364 }
365
366 buff->paddr = 0;
367 memset(buff->payload, 0, size);
368 ath11k_dbring_bufs_replenish(ar, ring, buff, module_id);
369 }
370
371 spin_unlock_bh(&srng->lock);
372
373 rcu_unlock:
374 rcu_read_unlock();
375
376 return ret;
377 }
378
ath11k_dbring_srng_cleanup(struct ath11k * ar,struct ath11k_dbring * ring)379 void ath11k_dbring_srng_cleanup(struct ath11k *ar, struct ath11k_dbring *ring)
380 {
381 ath11k_dp_srng_cleanup(ar->ab, &ring->refill_srng);
382 }
383
ath11k_dbring_buf_cleanup(struct ath11k * ar,struct ath11k_dbring * ring)384 void ath11k_dbring_buf_cleanup(struct ath11k *ar, struct ath11k_dbring *ring)
385 {
386 struct ath11k_dbring_element *buff;
387 int buf_id;
388
389 spin_lock_bh(&ring->idr_lock);
390 idr_for_each_entry(&ring->bufs_idr, buff, buf_id) {
391 idr_remove(&ring->bufs_idr, buf_id);
392 dma_unmap_single(ar->ab->dev, buff->paddr,
393 ring->buf_sz, DMA_FROM_DEVICE);
394 kfree(buff->payload);
395 kfree(buff);
396 }
397
398 idr_destroy(&ring->bufs_idr);
399 spin_unlock_bh(&ring->idr_lock);
400 }
401