summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/fnic/vnic_wq.c
blob: 442972c04e65d39277b3f614f9048692b7f28af9 (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
/*
 * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
 *
 * This program is free software; you may redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include "vnic_dev.h"
#include "vnic_wq.h"


static int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
		unsigned int index, enum vnic_res_type res_type)
{
	wq->ctrl = vnic_dev_get_res(vdev, res_type, index);

	if (!wq->ctrl)
		return -EINVAL;

	return 0;
}


static int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
		unsigned int desc_count, unsigned int desc_size)
{
	return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
}


static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
{
	struct vnic_wq_buf *buf;
	unsigned int i, j, count = wq->ring.desc_count;
	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);

	for (i = 0; i < blks; i++) {
		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
		if (!wq->bufs[i]) {
			printk(KERN_ERR "Failed to alloc wq_bufs\n");
			return -ENOMEM;
		}
	}

	for (i = 0; i < blks; i++) {
		buf = wq->bufs[i];
		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
			buf->desc = (u8 *)wq->ring.descs +
				wq->ring.desc_size * buf->index;
			if (buf->index + 1 == count) {
				buf->next = wq->bufs[0];
				break;
			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
				buf->next = wq->bufs[i + 1];
			} else {
				buf->next = buf + 1;
				buf++;
			}
		}
	}

	wq->to_use = wq->to_clean = wq->bufs[0];

	return 0;
}

void vnic_wq_free(struct vnic_wq *wq)
{
	struct vnic_dev *vdev;
	unsigned int i;

	vdev = wq->vdev;

	vnic_dev_free_desc_ring(vdev, &wq->ring);

	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
		kfree(wq->bufs[i]);
		wq->bufs[i] = NULL;
	}

	wq->ctrl = NULL;

}

int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
	unsigned int desc_count, unsigned int desc_size)
{
	int err;

	wq->index = index;
	wq->vdev = vdev;

	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
	if (!wq->ctrl) {
		printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
		return -EINVAL;
	}

	vnic_wq_disable(wq);

	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
	if (err)
		return err;

	err = vnic_wq_alloc_bufs(wq);
	if (err) {
		vnic_wq_free(wq);
		return err;
	}

	return 0;
}


int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
		unsigned int desc_count, unsigned int desc_size)
{
	int err;

	wq->index = 0;
	wq->vdev = vdev;

	err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
	if (err) {
		pr_err("Failed to get devcmd2 resource\n");
		return err;
	}
	vnic_wq_disable(wq);

	err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
	if (err)
		return err;
	return 0;
}

void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
		unsigned int fetch_index, unsigned int posted_index,
		unsigned int error_interrupt_enable,
		unsigned int error_interrupt_offset)
{
	u64 paddr;
	unsigned int count = wq->ring.desc_count;

	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
	writeq(paddr, &wq->ctrl->ring_base);
	iowrite32(count, &wq->ctrl->ring_size);
	iowrite32(fetch_index, &wq->ctrl->fetch_index);
	iowrite32(posted_index, &wq->ctrl->posted_index);
	iowrite32(cq_index, &wq->ctrl->cq_index);
	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
	iowrite32(0, &wq->ctrl->error_status);

	wq->to_use = wq->to_clean =
		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
		[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
}


void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
	unsigned int error_interrupt_enable,
	unsigned int error_interrupt_offset)
{
	u64 paddr;

	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
	writeq(paddr, &wq->ctrl->ring_base);
	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
	iowrite32(0, &wq->ctrl->fetch_index);
	iowrite32(0, &wq->ctrl->posted_index);
	iowrite32(cq_index, &wq->ctrl->cq_index);
	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
	iowrite32(0, &wq->ctrl->error_status);
}

unsigned int vnic_wq_error_status(struct vnic_wq *wq)
{
	return ioread32(&wq->ctrl->error_status);
}

void vnic_wq_enable(struct vnic_wq *wq)
{
	iowrite32(1, &wq->ctrl->enable);
}

int vnic_wq_disable(struct vnic_wq *wq)
{
	unsigned int wait;

	iowrite32(0, &wq->ctrl->enable);

	/* Wait for HW to ACK disable request */
	for (wait = 0; wait < 100; wait++) {
		if (!(ioread32(&wq->ctrl->running)))
			return 0;
		udelay(1);
	}

	printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);

	return -ETIMEDOUT;
}

void vnic_wq_clean(struct vnic_wq *wq,
	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
{
	struct vnic_wq_buf *buf;

	BUG_ON(ioread32(&wq->ctrl->enable));

	buf = wq->to_clean;

	while (vnic_wq_desc_used(wq) > 0) {

		(*buf_clean)(wq, buf);

		buf = wq->to_clean = buf->next;
		wq->ring.desc_avail++;
	}

	wq->to_use = wq->to_clean = wq->bufs[0];

	iowrite32(0, &wq->ctrl->fetch_index);
	iowrite32(0, &wq->ctrl->posted_index);
	iowrite32(0, &wq->ctrl->error_status);

	vnic_dev_clear_desc_ring(&wq->ring);
}