1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2012-2015,2017 Qualcomm Atheros, Inc.
4 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
5 */
6
7 #include <linux/types.h>
8 #include <linux/errno.h>
9 #include <linux/fs.h>
10 #include <linux/seq_file.h>
11 #include "wmi.h"
12 #include "wil6210.h"
13 #include "txrx.h"
14 #include "pmc.h"
15
16 struct desc_alloc_info {
17 dma_addr_t pa;
18 void *va;
19 };
20
wil_is_pmc_allocated(struct pmc_ctx * pmc)21 static int wil_is_pmc_allocated(struct pmc_ctx *pmc)
22 {
23 return !!pmc->pring_va;
24 }
25
wil_pmc_init(struct wil6210_priv * wil)26 void wil_pmc_init(struct wil6210_priv *wil)
27 {
28 memset(&wil->pmc, 0, sizeof(struct pmc_ctx));
29 mutex_init(&wil->pmc.lock);
30 }
31
32 /* Allocate the physical ring (p-ring) and the required
33 * number of descriptors of required size.
34 * Initialize the descriptors as required by pmc dma.
35 * The descriptors' buffers dwords are initialized to hold
36 * dword's serial number in the lsw and reserved value
37 * PCM_DATA_INVALID_DW_VAL in the msw.
38 */
wil_pmc_alloc(struct wil6210_priv * wil,int num_descriptors,int descriptor_size)39 void wil_pmc_alloc(struct wil6210_priv *wil,
40 int num_descriptors,
41 int descriptor_size)
42 {
43 u32 i;
44 struct pmc_ctx *pmc = &wil->pmc;
45 struct device *dev = wil_to_dev(wil);
46 struct wil6210_vif *vif = ndev_to_vif(wil->main_ndev);
47 struct wmi_pmc_cmd pmc_cmd = {0};
48 int last_cmd_err = -ENOMEM;
49
50 mutex_lock(&pmc->lock);
51
52 if (wil_is_pmc_allocated(pmc)) {
53 /* sanity check */
54 wil_err(wil, "ERROR pmc is already allocated\n");
55 goto no_release_err;
56 }
57 if ((num_descriptors <= 0) || (descriptor_size <= 0)) {
58 wil_err(wil,
59 "Invalid params num_descriptors(%d), descriptor_size(%d)\n",
60 num_descriptors, descriptor_size);
61 last_cmd_err = -EINVAL;
62 goto no_release_err;
63 }
64
65 if (num_descriptors > (1 << WIL_RING_SIZE_ORDER_MAX)) {
66 wil_err(wil,
67 "num_descriptors(%d) exceeds max ring size %d\n",
68 num_descriptors, 1 << WIL_RING_SIZE_ORDER_MAX);
69 last_cmd_err = -EINVAL;
70 goto no_release_err;
71 }
72
73 if (num_descriptors > INT_MAX / descriptor_size) {
74 wil_err(wil,
75 "Overflow in num_descriptors(%d)*descriptor_size(%d)\n",
76 num_descriptors, descriptor_size);
77 last_cmd_err = -EINVAL;
78 goto no_release_err;
79 }
80
81 pmc->num_descriptors = num_descriptors;
82 pmc->descriptor_size = descriptor_size;
83
84 wil_dbg_misc(wil, "pmc_alloc: %d descriptors x %d bytes each\n",
85 num_descriptors, descriptor_size);
86
87 /* allocate descriptors info list in pmc context*/
88 pmc->descriptors = kcalloc(num_descriptors,
89 sizeof(struct desc_alloc_info),
90 GFP_KERNEL);
91 if (!pmc->descriptors) {
92 wil_err(wil, "ERROR allocating pmc skb list\n");
93 goto no_release_err;
94 }
95
96 wil_dbg_misc(wil, "pmc_alloc: allocated descriptors info list %p\n",
97 pmc->descriptors);
98
99 /* Allocate pring buffer and descriptors.
100 * vring->va should be aligned on its size rounded up to power of 2
101 * This is granted by the dma_alloc_coherent.
102 *
103 * HW has limitation that all vrings addresses must share the same
104 * upper 16 msb bits part of 48 bits address. To workaround that,
105 * if we are using more than 32 bit addresses switch to 32 bit
106 * allocation before allocating vring memory.
107 *
108 * There's no check for the return value of dma_set_mask_and_coherent,
109 * since we assume if we were able to set the mask during
110 * initialization in this system it will not fail if we set it again
111 */
112 if (wil->dma_addr_size > 32)
113 dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
114
115 pmc->pring_va = dma_alloc_coherent(dev,
116 sizeof(struct vring_tx_desc) * num_descriptors,
117 &pmc->pring_pa,
118 GFP_KERNEL);
119
120 if (wil->dma_addr_size > 32)
121 dma_set_mask_and_coherent(dev,
122 DMA_BIT_MASK(wil->dma_addr_size));
123
124 wil_dbg_misc(wil,
125 "pmc_alloc: allocated pring %p => %pad. %zd x %d = total %zd bytes\n",
126 pmc->pring_va, &pmc->pring_pa,
127 sizeof(struct vring_tx_desc),
128 num_descriptors,
129 sizeof(struct vring_tx_desc) * num_descriptors);
130
131 if (!pmc->pring_va) {
132 wil_err(wil, "ERROR allocating pmc pring\n");
133 goto release_pmc_skb_list;
134 }
135
136 /* initially, all descriptors are SW owned
137 * For Tx, Rx, and PMC, ownership bit is at the same location, thus
138 * we can use any
139 */
140 for (i = 0; i < num_descriptors; i++) {
141 struct vring_tx_desc *_d = &pmc->pring_va[i];
142 struct vring_tx_desc dd = {}, *d = ⅆ
143 int j = 0;
144
145 pmc->descriptors[i].va = dma_alloc_coherent(dev,
146 descriptor_size,
147 &pmc->descriptors[i].pa,
148 GFP_KERNEL);
149
150 if (unlikely(!pmc->descriptors[i].va)) {
151 wil_err(wil, "ERROR allocating pmc descriptor %d", i);
152 goto release_pmc_skbs;
153 }
154
155 for (j = 0; j < descriptor_size / sizeof(u32); j++) {
156 u32 *p = (u32 *)pmc->descriptors[i].va + j;
157 *p = PCM_DATA_INVALID_DW_VAL | j;
158 }
159
160 /* configure dma descriptor */
161 d->dma.addr.addr_low =
162 cpu_to_le32(lower_32_bits(pmc->descriptors[i].pa));
163 d->dma.addr.addr_high =
164 cpu_to_le16((u16)upper_32_bits(pmc->descriptors[i].pa));
165 d->dma.status = 0; /* 0 = HW_OWNED */
166 d->dma.length = cpu_to_le16(descriptor_size);
167 d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
168 *_d = *d;
169 }
170
171 wil_dbg_misc(wil, "pmc_alloc: allocated successfully\n");
172
173 pmc_cmd.op = WMI_PMC_ALLOCATE;
174 pmc_cmd.ring_size = cpu_to_le16(pmc->num_descriptors);
175 pmc_cmd.mem_base = cpu_to_le64(pmc->pring_pa);
176
177 wil_dbg_misc(wil, "pmc_alloc: send WMI_PMC_CMD with ALLOCATE op\n");
178 pmc->last_cmd_status = wmi_send(wil,
179 WMI_PMC_CMDID,
180 vif->mid,
181 &pmc_cmd,
182 sizeof(pmc_cmd));
183 if (pmc->last_cmd_status) {
184 wil_err(wil,
185 "WMI_PMC_CMD with ALLOCATE op failed with status %d",
186 pmc->last_cmd_status);
187 goto release_pmc_skbs;
188 }
189
190 mutex_unlock(&pmc->lock);
191
192 return;
193
194 release_pmc_skbs:
195 wil_err(wil, "exit on error: Releasing skbs...\n");
196 for (i = 0; i < num_descriptors && pmc->descriptors[i].va; i++) {
197 dma_free_coherent(dev,
198 descriptor_size,
199 pmc->descriptors[i].va,
200 pmc->descriptors[i].pa);
201
202 pmc->descriptors[i].va = NULL;
203 }
204 wil_err(wil, "exit on error: Releasing pring...\n");
205
206 dma_free_coherent(dev,
207 sizeof(struct vring_tx_desc) * num_descriptors,
208 pmc->pring_va,
209 pmc->pring_pa);
210
211 pmc->pring_va = NULL;
212
213 release_pmc_skb_list:
214 wil_err(wil, "exit on error: Releasing descriptors info list...\n");
215 kfree(pmc->descriptors);
216 pmc->descriptors = NULL;
217
218 no_release_err:
219 pmc->last_cmd_status = last_cmd_err;
220 mutex_unlock(&pmc->lock);
221 }
222
223 /* Traverse the p-ring and release all buffers.
224 * At the end release the p-ring memory
225 */
wil_pmc_free(struct wil6210_priv * wil,int send_pmc_cmd)226 void wil_pmc_free(struct wil6210_priv *wil, int send_pmc_cmd)
227 {
228 struct pmc_ctx *pmc = &wil->pmc;
229 struct device *dev = wil_to_dev(wil);
230 struct wil6210_vif *vif = ndev_to_vif(wil->main_ndev);
231 struct wmi_pmc_cmd pmc_cmd = {0};
232
233 mutex_lock(&pmc->lock);
234
235 pmc->last_cmd_status = 0;
236
237 if (!wil_is_pmc_allocated(pmc)) {
238 wil_dbg_misc(wil,
239 "pmc_free: Error, can't free - not allocated\n");
240 pmc->last_cmd_status = -EPERM;
241 mutex_unlock(&pmc->lock);
242 return;
243 }
244
245 if (send_pmc_cmd) {
246 wil_dbg_misc(wil, "send WMI_PMC_CMD with RELEASE op\n");
247 pmc_cmd.op = WMI_PMC_RELEASE;
248 pmc->last_cmd_status =
249 wmi_send(wil, WMI_PMC_CMDID, vif->mid,
250 &pmc_cmd, sizeof(pmc_cmd));
251 if (pmc->last_cmd_status) {
252 wil_err(wil,
253 "WMI_PMC_CMD with RELEASE op failed, status %d",
254 pmc->last_cmd_status);
255 /* There's nothing we can do with this error.
256 * Normally, it should never occur.
257 * Continue to freeing all memory allocated for pmc.
258 */
259 }
260 }
261
262 if (pmc->pring_va) {
263 size_t buf_size = sizeof(struct vring_tx_desc) *
264 pmc->num_descriptors;
265
266 wil_dbg_misc(wil, "pmc_free: free pring va %p\n",
267 pmc->pring_va);
268 dma_free_coherent(dev, buf_size, pmc->pring_va, pmc->pring_pa);
269
270 pmc->pring_va = NULL;
271 } else {
272 pmc->last_cmd_status = -ENOENT;
273 }
274
275 if (pmc->descriptors) {
276 int i;
277
278 for (i = 0;
279 i < pmc->num_descriptors && pmc->descriptors[i].va; i++) {
280 dma_free_coherent(dev,
281 pmc->descriptor_size,
282 pmc->descriptors[i].va,
283 pmc->descriptors[i].pa);
284 pmc->descriptors[i].va = NULL;
285 }
286 wil_dbg_misc(wil, "pmc_free: free descriptor info %d/%d\n", i,
287 pmc->num_descriptors);
288 wil_dbg_misc(wil,
289 "pmc_free: free pmc descriptors info list %p\n",
290 pmc->descriptors);
291 kfree(pmc->descriptors);
292 pmc->descriptors = NULL;
293 } else {
294 pmc->last_cmd_status = -ENOENT;
295 }
296
297 mutex_unlock(&pmc->lock);
298 }
299
300 /* Status of the last operation requested via debugfs: alloc/free/read.
301 * 0 - success or negative errno
302 */
wil_pmc_last_cmd_status(struct wil6210_priv * wil)303 int wil_pmc_last_cmd_status(struct wil6210_priv *wil)
304 {
305 wil_dbg_misc(wil, "pmc_last_cmd_status: status %d\n",
306 wil->pmc.last_cmd_status);
307
308 return wil->pmc.last_cmd_status;
309 }
310
311 /* Read from required position up to the end of current descriptor,
312 * depends on descriptor size configured during alloc request.
313 */
wil_pmc_read(struct file * filp,char __user * buf,size_t count,loff_t * f_pos)314 ssize_t wil_pmc_read(struct file *filp, char __user *buf, size_t count,
315 loff_t *f_pos)
316 {
317 struct wil6210_priv *wil = filp->private_data;
318 struct pmc_ctx *pmc = &wil->pmc;
319 size_t retval = 0;
320 unsigned long long idx;
321 loff_t offset;
322 size_t pmc_size;
323
324 mutex_lock(&pmc->lock);
325
326 if (!wil_is_pmc_allocated(pmc)) {
327 wil_err(wil, "error, pmc is not allocated!\n");
328 pmc->last_cmd_status = -EPERM;
329 mutex_unlock(&pmc->lock);
330 return -EPERM;
331 }
332
333 pmc_size = pmc->descriptor_size * pmc->num_descriptors;
334
335 wil_dbg_misc(wil,
336 "pmc_read: size %u, pos %lld\n",
337 (u32)count, *f_pos);
338
339 pmc->last_cmd_status = 0;
340
341 idx = *f_pos;
342 do_div(idx, pmc->descriptor_size);
343 offset = *f_pos - (idx * pmc->descriptor_size);
344
345 if (*f_pos >= pmc_size) {
346 wil_dbg_misc(wil,
347 "pmc_read: reached end of pmc buf: %lld >= %u\n",
348 *f_pos, (u32)pmc_size);
349 pmc->last_cmd_status = -ERANGE;
350 goto out;
351 }
352
353 wil_dbg_misc(wil,
354 "pmc_read: read from pos %lld (descriptor %llu, offset %llu) %zu bytes\n",
355 *f_pos, idx, offset, count);
356
357 /* if no errors, return the copied byte count */
358 retval = simple_read_from_buffer(buf,
359 count,
360 &offset,
361 pmc->descriptors[idx].va,
362 pmc->descriptor_size);
363 *f_pos += retval;
364 out:
365 mutex_unlock(&pmc->lock);
366
367 return retval;
368 }
369
wil_pmc_llseek(struct file * filp,loff_t off,int whence)370 loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence)
371 {
372 loff_t newpos;
373 struct wil6210_priv *wil = filp->private_data;
374 struct pmc_ctx *pmc = &wil->pmc;
375 size_t pmc_size;
376
377 mutex_lock(&pmc->lock);
378
379 if (!wil_is_pmc_allocated(pmc)) {
380 wil_err(wil, "error, pmc is not allocated!\n");
381 pmc->last_cmd_status = -EPERM;
382 mutex_unlock(&pmc->lock);
383 return -EPERM;
384 }
385
386 pmc_size = pmc->descriptor_size * pmc->num_descriptors;
387
388 switch (whence) {
389 case 0: /* SEEK_SET */
390 newpos = off;
391 break;
392
393 case 1: /* SEEK_CUR */
394 newpos = filp->f_pos + off;
395 break;
396
397 case 2: /* SEEK_END */
398 newpos = pmc_size;
399 break;
400
401 default: /* can't happen */
402 newpos = -EINVAL;
403 goto out;
404 }
405
406 if (newpos < 0) {
407 newpos = -EINVAL;
408 goto out;
409 }
410 if (newpos > pmc_size)
411 newpos = pmc_size;
412
413 filp->f_pos = newpos;
414
415 out:
416 mutex_unlock(&pmc->lock);
417
418 return newpos;
419 }
420
wil_pmcring_read(struct seq_file * s,void * data)421 int wil_pmcring_read(struct seq_file *s, void *data)
422 {
423 struct wil6210_priv *wil = s->private;
424 struct pmc_ctx *pmc = &wil->pmc;
425 size_t pmc_ring_size =
426 sizeof(struct vring_rx_desc) * pmc->num_descriptors;
427
428 mutex_lock(&pmc->lock);
429
430 if (!wil_is_pmc_allocated(pmc)) {
431 wil_err(wil, "error, pmc is not allocated!\n");
432 pmc->last_cmd_status = -EPERM;
433 mutex_unlock(&pmc->lock);
434 return -EPERM;
435 }
436
437 wil_dbg_misc(wil, "pmcring_read: size %zu\n", pmc_ring_size);
438
439 seq_write(s, pmc->pring_va, pmc_ring_size);
440
441 mutex_unlock(&pmc->lock);
442
443 return 0;
444 }
445