summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
blob: c36d64710fa69a94d911046a136cb231740f4c41 (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
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
/*
 * Copyright (c) 2016~2017 Hisilicon Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/dma-direction.h>
#include "hclge_cmd.h"
#include "hnae3.h"
#include "hclge_main.h"

#define hclge_is_csq(ring) ((ring)->flag & HCLGE_TYPE_CSQ)
#define hclge_ring_to_dma_dir(ring) (hclge_is_csq(ring) ? \
	DMA_TO_DEVICE : DMA_FROM_DEVICE)
#define cmq_ring_to_dev(ring)   (&(ring)->dev->pdev->dev)

static int hclge_ring_space(struct hclge_cmq_ring *ring)
{
	int ntu = ring->next_to_use;
	int ntc = ring->next_to_clean;
	int used = (ntu - ntc + ring->desc_num) % ring->desc_num;

	return ring->desc_num - used - 1;
}

static int is_valid_csq_clean_head(struct hclge_cmq_ring *ring, int h)
{
	int u = ring->next_to_use;
	int c = ring->next_to_clean;

	if (unlikely(h >= ring->desc_num))
		return 0;

	return u > c ? (h > c && h <= u) : (h > c || h <= u);
}

static int hclge_alloc_cmd_desc(struct hclge_cmq_ring *ring)
{
	int size  = ring->desc_num * sizeof(struct hclge_desc);

	ring->desc = kzalloc(size, GFP_KERNEL);
	if (!ring->desc)
		return -ENOMEM;

	ring->desc_dma_addr = dma_map_single(cmq_ring_to_dev(ring), ring->desc,
					     size, DMA_BIDIRECTIONAL);
	if (dma_mapping_error(cmq_ring_to_dev(ring), ring->desc_dma_addr)) {
		ring->desc_dma_addr = 0;
		kfree(ring->desc);
		ring->desc = NULL;
		return -ENOMEM;
	}

	return 0;
}

static void hclge_free_cmd_desc(struct hclge_cmq_ring *ring)
{
	dma_unmap_single(cmq_ring_to_dev(ring), ring->desc_dma_addr,
			 ring->desc_num * sizeof(ring->desc[0]),
			 DMA_BIDIRECTIONAL);

	ring->desc_dma_addr = 0;
	kfree(ring->desc);
	ring->desc = NULL;
}

static int hclge_alloc_cmd_queue(struct hclge_dev *hdev, int ring_type)
{
	struct hclge_hw *hw = &hdev->hw;
	struct hclge_cmq_ring *ring =
		(ring_type == HCLGE_TYPE_CSQ) ? &hw->cmq.csq : &hw->cmq.crq;
	int ret;

	ring->flag = ring_type;
	ring->dev = hdev;

	ret = hclge_alloc_cmd_desc(ring);
	if (ret) {
		dev_err(&hdev->pdev->dev, "descriptor %s alloc error %d\n",
			(ring_type == HCLGE_TYPE_CSQ) ? "CSQ" : "CRQ", ret);
		return ret;
	}

	return 0;
}

void hclge_cmd_reuse_desc(struct hclge_desc *desc, bool is_read)
{
	desc->flag = cpu_to_le16(HCLGE_CMD_FLAG_NO_INTR | HCLGE_CMD_FLAG_IN);
	if (is_read)
		desc->flag |= cpu_to_le16(HCLGE_CMD_FLAG_WR);
	else
		desc->flag &= cpu_to_le16(~HCLGE_CMD_FLAG_WR);
}

void hclge_cmd_setup_basic_desc(struct hclge_desc *desc,
				enum hclge_opcode_type opcode, bool is_read)
{
	memset((void *)desc, 0, sizeof(struct hclge_desc));
	desc->opcode = cpu_to_le16(opcode);
	desc->flag = cpu_to_le16(HCLGE_CMD_FLAG_NO_INTR | HCLGE_CMD_FLAG_IN);

	if (is_read)
		desc->flag |= cpu_to_le16(HCLGE_CMD_FLAG_WR);
	else
		desc->flag &= cpu_to_le16(~HCLGE_CMD_FLAG_WR);
}

static void hclge_cmd_config_regs(struct hclge_cmq_ring *ring)
{
	dma_addr_t dma = ring->desc_dma_addr;
	struct hclge_dev *hdev = ring->dev;
	struct hclge_hw *hw = &hdev->hw;

	if (ring->flag == HCLGE_TYPE_CSQ) {
		hclge_write_dev(hw, HCLGE_NIC_CSQ_BASEADDR_L_REG,
				(u32)dma);
		hclge_write_dev(hw, HCLGE_NIC_CSQ_BASEADDR_H_REG,
				(u32)((dma >> 31) >> 1));
		hclge_write_dev(hw, HCLGE_NIC_CSQ_DEPTH_REG,
				(ring->desc_num >> HCLGE_NIC_CMQ_DESC_NUM_S) |
				HCLGE_NIC_CMQ_ENABLE);
		hclge_write_dev(hw, HCLGE_NIC_CSQ_TAIL_REG, 0);
		hclge_write_dev(hw, HCLGE_NIC_CSQ_HEAD_REG, 0);
	} else {
		hclge_write_dev(hw, HCLGE_NIC_CRQ_BASEADDR_L_REG,
				(u32)dma);
		hclge_write_dev(hw, HCLGE_NIC_CRQ_BASEADDR_H_REG,
				(u32)((dma >> 31) >> 1));
		hclge_write_dev(hw, HCLGE_NIC_CRQ_DEPTH_REG,
				(ring->desc_num >> HCLGE_NIC_CMQ_DESC_NUM_S) |
				HCLGE_NIC_CMQ_ENABLE);
		hclge_write_dev(hw, HCLGE_NIC_CRQ_TAIL_REG, 0);
		hclge_write_dev(hw, HCLGE_NIC_CRQ_HEAD_REG, 0);
	}
}

static void hclge_cmd_init_regs(struct hclge_hw *hw)
{
	hclge_cmd_config_regs(&hw->cmq.csq);
	hclge_cmd_config_regs(&hw->cmq.crq);
}

static int hclge_cmd_csq_clean(struct hclge_hw *hw)
{
	struct hclge_dev *hdev = (struct hclge_dev *)hw->back;
	struct hclge_cmq_ring *csq = &hw->cmq.csq;
	u16 ntc = csq->next_to_clean;
	struct hclge_desc *desc;
	int clean = 0;
	u32 head;

	desc = &csq->desc[ntc];
	head = hclge_read_dev(hw, HCLGE_NIC_CSQ_HEAD_REG);
	rmb(); /* Make sure head is ready before touch any data */

	if (!is_valid_csq_clean_head(csq, head)) {
		dev_warn(&hdev->pdev->dev, "wrong head (%d, %d-%d)\n", head,
			   csq->next_to_use, csq->next_to_clean);
		return 0;
	}

	while (head != ntc) {
		memset(desc, 0, sizeof(*desc));
		ntc++;
		if (ntc == csq->desc_num)
			ntc = 0;
		desc = &csq->desc[ntc];
		clean++;
	}
	csq->next_to_clean = ntc;

	return clean;
}

static int hclge_cmd_csq_done(struct hclge_hw *hw)
{
	u32 head = hclge_read_dev(hw, HCLGE_NIC_CSQ_HEAD_REG);
	return head == hw->cmq.csq.next_to_use;
}

static bool hclge_is_special_opcode(u16 opcode)
{
	/* these commands have several descriptors,
	 * and use the first one to save opcode and return value
	 */
	u16 spec_opcode[3] = {HCLGE_OPC_STATS_64_BIT,
		HCLGE_OPC_STATS_32_BIT, HCLGE_OPC_STATS_MAC};
	int i;

	for (i = 0; i < ARRAY_SIZE(spec_opcode); i++) {
		if (spec_opcode[i] == opcode)
			return true;
	}

	return false;
}

/**
 * hclge_cmd_send - send command to command queue
 * @hw: pointer to the hw struct
 * @desc: prefilled descriptor for describing the command
 * @num : the number of descriptors to be sent
 *
 * This is the main send command for command queue, it
 * sends the queue, cleans the queue, etc
 **/
int hclge_cmd_send(struct hclge_hw *hw, struct hclge_desc *desc, int num)
{
	struct hclge_dev *hdev = (struct hclge_dev *)hw->back;
	struct hclge_desc *desc_to_use;
	bool complete = false;
	u32 timeout = 0;
	int handle = 0;
	int retval = 0;
	u16 opcode, desc_ret;
	int ntc;

	spin_lock_bh(&hw->cmq.csq.lock);

	if (num > hclge_ring_space(&hw->cmq.csq)) {
		spin_unlock_bh(&hw->cmq.csq.lock);
		return -EBUSY;
	}

	/**
	 * Record the location of desc in the ring for this time
	 * which will be use for hardware to write back
	 */
	ntc = hw->cmq.csq.next_to_use;
	opcode = le16_to_cpu(desc[0].opcode);
	while (handle < num) {
		desc_to_use = &hw->cmq.csq.desc[hw->cmq.csq.next_to_use];
		*desc_to_use = desc[handle];
		(hw->cmq.csq.next_to_use)++;
		if (hw->cmq.csq.next_to_use == hw->cmq.csq.desc_num)
			hw->cmq.csq.next_to_use = 0;
		handle++;
	}

	/* Write to hardware */
	hclge_write_dev(hw, HCLGE_NIC_CSQ_TAIL_REG, hw->cmq.csq.next_to_use);

	/**
	 * If the command is sync, wait for the firmware to write back,
	 * if multi descriptors to be sent, use the first one to check
	 */
	if (HCLGE_SEND_SYNC(le16_to_cpu(desc->flag))) {
		do {
			if (hclge_cmd_csq_done(hw))
				break;
			udelay(1);
			timeout++;
		} while (timeout < hw->cmq.tx_timeout);
	}

	if (hclge_cmd_csq_done(hw)) {
		complete = true;
		handle = 0;
		while (handle < num) {
			/* Get the result of hardware write back */
			desc_to_use = &hw->cmq.csq.desc[ntc];
			desc[handle] = *desc_to_use;
			pr_debug("Get cmd desc:\n");

			if (likely(!hclge_is_special_opcode(opcode)))
				desc_ret = le16_to_cpu(desc[handle].retval);
			else
				desc_ret = le16_to_cpu(desc[0].retval);

			if ((enum hclge_cmd_return_status)desc_ret ==
			    HCLGE_CMD_EXEC_SUCCESS)
				retval = 0;
			else
				retval = -EIO;
			hw->cmq.last_status = (enum hclge_cmd_status)desc_ret;
			ntc++;
			handle++;
			if (ntc == hw->cmq.csq.desc_num)
				ntc = 0;
		}
	}

	if (!complete)
		retval = -EAGAIN;

	/* Clean the command send queue */
	handle = hclge_cmd_csq_clean(hw);
	if (handle != num) {
		dev_warn(&hdev->pdev->dev,
			 "cleaned %d, need to clean %d\n", handle, num);
	}

	spin_unlock_bh(&hw->cmq.csq.lock);

	return retval;
}

static enum hclge_cmd_status hclge_cmd_query_firmware_version(
		struct hclge_hw *hw, u32 *version)
{
	struct hclge_query_version_cmd *resp;
	struct hclge_desc desc;
	int ret;

	hclge_cmd_setup_basic_desc(&desc, HCLGE_OPC_QUERY_FW_VER, 1);
	resp = (struct hclge_query_version_cmd *)desc.data;

	ret = hclge_cmd_send(hw, &desc, 1);
	if (!ret)
		*version = le32_to_cpu(resp->firmware);

	return ret;
}

int hclge_cmd_queue_init(struct hclge_dev *hdev)
{
	int ret;

	/* Setup the queue entries for use cmd queue */
	hdev->hw.cmq.csq.desc_num = HCLGE_NIC_CMQ_DESC_NUM;
	hdev->hw.cmq.crq.desc_num = HCLGE_NIC_CMQ_DESC_NUM;

	/* Setup Tx write back timeout */
	hdev->hw.cmq.tx_timeout = HCLGE_CMDQ_TX_TIMEOUT;

	/* Setup queue rings */
	ret = hclge_alloc_cmd_queue(hdev, HCLGE_TYPE_CSQ);
	if (ret) {
		dev_err(&hdev->pdev->dev,
			"CSQ ring setup error %d\n", ret);
		return ret;
	}

	ret = hclge_alloc_cmd_queue(hdev, HCLGE_TYPE_CRQ);
	if (ret) {
		dev_err(&hdev->pdev->dev,
			"CRQ ring setup error %d\n", ret);
		goto err_csq;
	}

	return 0;
err_csq:
	hclge_free_cmd_desc(&hdev->hw.cmq.csq);
	return ret;
}

int hclge_cmd_init(struct hclge_dev *hdev)
{
	u32 version;
	int ret;

	hdev->hw.cmq.csq.next_to_clean = 0;
	hdev->hw.cmq.csq.next_to_use = 0;
	hdev->hw.cmq.crq.next_to_clean = 0;
	hdev->hw.cmq.crq.next_to_use = 0;

	/* Setup the lock for command queue */
	spin_lock_init(&hdev->hw.cmq.csq.lock);
	spin_lock_init(&hdev->hw.cmq.crq.lock);

	hclge_cmd_init_regs(&hdev->hw);

	ret = hclge_cmd_query_firmware_version(&hdev->hw, &version);
	if (ret) {
		dev_err(&hdev->pdev->dev,
			"firmware version query failed %d\n", ret);
		return ret;
	}
	hdev->fw_version = version;

	dev_info(&hdev->pdev->dev, "The firmware version is %08x\n", version);

	return 0;
}

static void hclge_destroy_queue(struct hclge_cmq_ring *ring)
{
	spin_lock(&ring->lock);
	hclge_free_cmd_desc(ring);
	spin_unlock(&ring->lock);
}

void hclge_destroy_cmd_queue(struct hclge_hw *hw)
{
	hclge_destroy_queue(&hw->cmq.csq);
	hclge_destroy_queue(&hw->cmq.crq);
}