summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/ath/wil6210/pmc.c
blob: 5ca0307a3274dd7ab9cf3d31c950e856aeb343cc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
/*
 * Copyright (c) 2012-2015 Qualcomm Atheros, Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include "wmi.h"
#include "wil6210.h"
#include "txrx.h"
#include "pmc.h"

struct desc_alloc_info {
	dma_addr_t pa;
	void	  *va;
};

static int wil_is_pmc_allocated(struct pmc_ctx *pmc)
{
	return !!pmc->pring_va;
}

void wil_pmc_init(struct wil6210_priv *wil)
{
	memset(&wil->pmc, 0, sizeof(struct pmc_ctx));
	mutex_init(&wil->pmc.lock);
}

/**
 * Allocate the physical ring (p-ring) and the required
 * number of descriptors of required size.
 * Initialize the descriptors as required by pmc dma.
 * The descriptors' buffers dwords are initialized to hold
 * dword's serial number in the lsw and reserved value
 * PCM_DATA_INVALID_DW_VAL in the msw.
 */
void wil_pmc_alloc(struct wil6210_priv *wil,
		   int num_descriptors,
		   int descriptor_size)
{
	u32 i;
	struct pmc_ctx *pmc = &wil->pmc;
	struct device *dev = wil_to_dev(wil);
	struct wmi_pmc_cmd pmc_cmd = {0};

	mutex_lock(&pmc->lock);

	if (wil_is_pmc_allocated(pmc)) {
		/* sanity check */
		wil_err(wil, "%s: ERROR pmc is already allocated\n", __func__);
		goto no_release_err;
	}

	pmc->num_descriptors = num_descriptors;
	pmc->descriptor_size = descriptor_size;

	wil_dbg_misc(wil, "%s: %d descriptors x %d bytes each\n",
		     __func__, num_descriptors, descriptor_size);

	/* allocate descriptors info list in pmc context*/
	pmc->descriptors = kcalloc(num_descriptors,
				  sizeof(struct desc_alloc_info),
				  GFP_KERNEL);
	if (!pmc->descriptors) {
		wil_err(wil, "%s: ERROR allocating pmc skb list\n", __func__);
		goto no_release_err;
	}

	wil_dbg_misc(wil,
		     "%s: allocated descriptors info list %p\n",
		     __func__, pmc->descriptors);

	/* Allocate pring buffer and descriptors.
	 * vring->va should be aligned on its size rounded up to power of 2
	 * This is granted by the dma_alloc_coherent
	 */
	pmc->pring_va = dma_alloc_coherent(dev,
			sizeof(struct vring_tx_desc) * num_descriptors,
			&pmc->pring_pa,
			GFP_KERNEL);

	wil_dbg_misc(wil,
		     "%s: allocated pring %p => %pad. %zd x %d = total %zd bytes\n",
		     __func__,
		     pmc->pring_va, &pmc->pring_pa,
		     sizeof(struct vring_tx_desc),
		     num_descriptors,
		     sizeof(struct vring_tx_desc) * num_descriptors);

	if (!pmc->pring_va) {
		wil_err(wil, "%s: ERROR allocating pmc pring\n", __func__);
		goto release_pmc_skb_list;
	}

	/* initially, all descriptors are SW owned
	 * For Tx, Rx, and PMC, ownership bit is at the same location, thus
	 * we can use any
	 */
	for (i = 0; i < num_descriptors; i++) {
		struct vring_tx_desc *_d = &pmc->pring_va[i];
		struct vring_tx_desc dd = {}, *d = &dd;
		int j = 0;

		pmc->descriptors[i].va = dma_alloc_coherent(dev,
			descriptor_size,
			&pmc->descriptors[i].pa,
			GFP_KERNEL);

		if (unlikely(!pmc->descriptors[i].va)) {
			wil_err(wil,
				"%s: ERROR allocating pmc descriptor %d",
				__func__, i);
			goto release_pmc_skbs;
		}

		for (j = 0; j < descriptor_size / sizeof(u32); j++) {
			u32 *p = (u32 *)pmc->descriptors[i].va + j;
			*p = PCM_DATA_INVALID_DW_VAL | j;
		}

		/* configure dma descriptor */
		d->dma.addr.addr_low =
			cpu_to_le32(lower_32_bits(pmc->descriptors[i].pa));
		d->dma.addr.addr_high =
			cpu_to_le16((u16)upper_32_bits(pmc->descriptors[i].pa));
		d->dma.status = 0; /* 0 = HW_OWNED */
		d->dma.length = cpu_to_le16(descriptor_size);
		d->dma.d0 = BIT(9) | RX_DMA_D0_CMD_DMA_IT;
		*_d = *d;
	}

	wil_dbg_misc(wil, "%s: allocated successfully\n", __func__);

	pmc_cmd.op = WMI_PMC_ALLOCATE;
	pmc_cmd.ring_size = cpu_to_le16(pmc->num_descriptors);
	pmc_cmd.mem_base = cpu_to_le64(pmc->pring_pa);

	wil_dbg_misc(wil, "%s: send WMI_PMC_CMD with ALLOCATE op\n", __func__);
	pmc->last_cmd_status = wmi_send(wil,
					WMI_PMC_CMDID,
					&pmc_cmd,
					sizeof(pmc_cmd));
	if (pmc->last_cmd_status) {
		wil_err(wil,
			"%s: WMI_PMC_CMD with ALLOCATE op failed with status %d",
			__func__, pmc->last_cmd_status);
		goto release_pmc_skbs;
	}

	mutex_unlock(&pmc->lock);

	return;

release_pmc_skbs:
	wil_err(wil, "%s: exit on error: Releasing skbs...\n", __func__);
	for (i = 0; pmc->descriptors[i].va && i < num_descriptors; i++) {
		dma_free_coherent(dev,
				  descriptor_size,
				  pmc->descriptors[i].va,
				  pmc->descriptors[i].pa);

		pmc->descriptors[i].va = NULL;
	}
	wil_err(wil, "%s: exit on error: Releasing pring...\n", __func__);

	dma_free_coherent(dev,
			  sizeof(struct vring_tx_desc) * num_descriptors,
			  pmc->pring_va,
			  pmc->pring_pa);

	pmc->pring_va = NULL;

release_pmc_skb_list:
	wil_err(wil, "%s: exit on error: Releasing descriptors info list...\n",
		__func__);
	kfree(pmc->descriptors);
	pmc->descriptors = NULL;

no_release_err:
	pmc->last_cmd_status = -ENOMEM;
	mutex_unlock(&pmc->lock);
}

/**
 * Traverse the p-ring and release all buffers.
 * At the end release the p-ring memory
 */
void wil_pmc_free(struct wil6210_priv *wil, int send_pmc_cmd)
{
	struct pmc_ctx *pmc = &wil->pmc;
	struct device *dev = wil_to_dev(wil);
	struct wmi_pmc_cmd pmc_cmd = {0};

	mutex_lock(&pmc->lock);

	pmc->last_cmd_status = 0;

	if (!wil_is_pmc_allocated(pmc)) {
		wil_dbg_misc(wil, "%s: Error, can't free - not allocated\n",
			     __func__);
		pmc->last_cmd_status = -EPERM;
		mutex_unlock(&pmc->lock);
		return;
	}

	if (send_pmc_cmd) {
		wil_dbg_misc(wil, "%s: send WMI_PMC_CMD with RELEASE op\n",
			     __func__);
		pmc_cmd.op = WMI_PMC_RELEASE;
		pmc->last_cmd_status =
				wmi_send(wil, WMI_PMC_CMDID, &pmc_cmd,
					 sizeof(pmc_cmd));
		if (pmc->last_cmd_status) {
			wil_err(wil,
				"%s WMI_PMC_CMD with RELEASE op failed, status %d",
				__func__, pmc->last_cmd_status);
			/* There's nothing we can do with this error.
			 * Normally, it should never occur.
			 * Continue to freeing all memory allocated for pmc.
			 */
		}
	}

	if (pmc->pring_va) {
		size_t buf_size = sizeof(struct vring_tx_desc) *
				  pmc->num_descriptors;

		wil_dbg_misc(wil, "%s: free pring va %p\n",
			     __func__, pmc->pring_va);
		dma_free_coherent(dev, buf_size, pmc->pring_va, pmc->pring_pa);

		pmc->pring_va = NULL;
	} else {
		pmc->last_cmd_status = -ENOENT;
	}

	if (pmc->descriptors) {
		int i;

		for (i = 0;
		     pmc->descriptors[i].va && i < pmc->num_descriptors; i++) {
			dma_free_coherent(dev,
					  pmc->descriptor_size,
					  pmc->descriptors[i].va,
					  pmc->descriptors[i].pa);
			pmc->descriptors[i].va = NULL;
		}
		wil_dbg_misc(wil, "%s: free descriptor info %d/%d\n",
			     __func__, i, pmc->num_descriptors);
		wil_dbg_misc(wil,
			     "%s: free pmc descriptors info list %p\n",
			     __func__, pmc->descriptors);
		kfree(pmc->descriptors);
		pmc->descriptors = NULL;
	} else {
		pmc->last_cmd_status = -ENOENT;
	}

	mutex_unlock(&pmc->lock);
}

/**
 * Status of the last operation requested via debugfs: alloc/free/read.
 * 0 - success or negative errno
 */
int wil_pmc_last_cmd_status(struct wil6210_priv *wil)
{
	wil_dbg_misc(wil, "%s: status %d\n", __func__,
		     wil->pmc.last_cmd_status);

	return wil->pmc.last_cmd_status;
}

/**
 * Read from required position up to the end of current descriptor,
 * depends on descriptor size configured during alloc request.
 */
ssize_t wil_pmc_read(struct file *filp, char __user *buf, size_t count,
		     loff_t *f_pos)
{
	struct wil6210_priv *wil = filp->private_data;
	struct pmc_ctx *pmc = &wil->pmc;
	size_t retval = 0;
	unsigned long long idx;
	loff_t offset;
	size_t pmc_size = pmc->descriptor_size * pmc->num_descriptors;

	mutex_lock(&pmc->lock);

	if (!wil_is_pmc_allocated(pmc)) {
		wil_err(wil, "%s: error, pmc is not allocated!\n", __func__);
		pmc->last_cmd_status = -EPERM;
		mutex_unlock(&pmc->lock);
		return -EPERM;
	}

	wil_dbg_misc(wil,
		     "%s: size %u, pos %lld\n",
		     __func__, (unsigned)count, *f_pos);

	pmc->last_cmd_status = 0;

	idx = *f_pos;
	do_div(idx, pmc->descriptor_size);
	offset = *f_pos - (idx * pmc->descriptor_size);

	if (*f_pos >= pmc_size) {
		wil_dbg_misc(wil, "%s: reached end of pmc buf: %lld >= %u\n",
			     __func__, *f_pos, (unsigned)pmc_size);
		pmc->last_cmd_status = -ERANGE;
		goto out;
	}

	wil_dbg_misc(wil,
		     "%s: read from pos %lld (descriptor %llu, offset %llu) %zu bytes\n",
		     __func__, *f_pos, idx, offset, count);

	/* if no errors, return the copied byte count */
	retval = simple_read_from_buffer(buf,
					 count,
					 &offset,
					 pmc->descriptors[idx].va,
					 pmc->descriptor_size);
	*f_pos += retval;
out:
	mutex_unlock(&pmc->lock);

	return retval;
}

loff_t wil_pmc_llseek(struct file *filp, loff_t off, int whence)
{
	loff_t newpos;
	struct wil6210_priv *wil = filp->private_data;
	struct pmc_ctx *pmc = &wil->pmc;
	size_t pmc_size = pmc->descriptor_size * pmc->num_descriptors;

	switch (whence) {
	case 0: /* SEEK_SET */
		newpos = off;
		break;

	case 1: /* SEEK_CUR */
		newpos = filp->f_pos + off;
		break;

	case 2: /* SEEK_END */
		newpos = pmc_size;
		break;

	default: /* can't happen */
		return -EINVAL;
	}

	if (newpos < 0)
		return -EINVAL;
	if (newpos > pmc_size)
		newpos = pmc_size;

	filp->f_pos = newpos;

	return newpos;
}
OpenPOWER on IntegriCloud