1 /*
2 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
4 *
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 *
18 */
19
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/pci.h>
24 #include <linux/delay.h>
25 #include <linux/slab.h>
26
27 #include "vnic_dev.h"
28 #include "vnic_wq.h"
29
vnic_wq_alloc_bufs(struct vnic_wq * wq)30 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
31 {
32 struct vnic_wq_buf *buf;
33 struct vnic_dev *vdev;
34 unsigned int i, j, count = wq->ring.desc_count;
35 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
36
37 vdev = wq->vdev;
38
39 for (i = 0; i < blks; i++) {
40 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
41 if (!wq->bufs[i])
42 return -ENOMEM;
43 }
44
45 for (i = 0; i < blks; i++) {
46 buf = wq->bufs[i];
47 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
48 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
49 buf->desc = (u8 *)wq->ring.descs +
50 wq->ring.desc_size * buf->index;
51 if (buf->index + 1 == count) {
52 buf->next = wq->bufs[0];
53 break;
54 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
55 buf->next = wq->bufs[i + 1];
56 } else {
57 buf->next = buf + 1;
58 buf++;
59 }
60 }
61 }
62
63 wq->to_use = wq->to_clean = wq->bufs[0];
64
65 return 0;
66 }
67
vnic_wq_free(struct vnic_wq * wq)68 void vnic_wq_free(struct vnic_wq *wq)
69 {
70 struct vnic_dev *vdev;
71 unsigned int i;
72
73 vdev = wq->vdev;
74
75 vnic_dev_free_desc_ring(vdev, &wq->ring);
76
77 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
78 if (wq->bufs[i]) {
79 kfree(wq->bufs[i]);
80 wq->bufs[i] = NULL;
81 }
82 }
83
84 wq->ctrl = NULL;
85 }
86
vnic_wq_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)87 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
88 unsigned int desc_count, unsigned int desc_size)
89 {
90 int err;
91
92 wq->index = index;
93 wq->vdev = vdev;
94
95 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
96 if (!wq->ctrl) {
97 pr_err("Failed to hook WQ[%d] resource\n", index);
98 return -EINVAL;
99 }
100
101 vnic_wq_disable(wq);
102
103 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
104 if (err)
105 return err;
106
107 err = vnic_wq_alloc_bufs(wq);
108 if (err) {
109 vnic_wq_free(wq);
110 return err;
111 }
112
113 return 0;
114 }
115
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)116 static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
117 unsigned int fetch_index, unsigned int posted_index,
118 unsigned int error_interrupt_enable,
119 unsigned int error_interrupt_offset)
120 {
121 u64 paddr;
122 unsigned int count = wq->ring.desc_count;
123
124 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
125 writeq(paddr, &wq->ctrl->ring_base);
126 iowrite32(count, &wq->ctrl->ring_size);
127 iowrite32(fetch_index, &wq->ctrl->fetch_index);
128 iowrite32(posted_index, &wq->ctrl->posted_index);
129 iowrite32(cq_index, &wq->ctrl->cq_index);
130 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
131 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
132 iowrite32(0, &wq->ctrl->error_status);
133
134 wq->to_use = wq->to_clean =
135 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
136 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
137 }
138
vnic_wq_init(struct vnic_wq * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)139 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
140 unsigned int error_interrupt_enable,
141 unsigned int error_interrupt_offset)
142 {
143 vnic_wq_init_start(wq, cq_index, 0, 0,
144 error_interrupt_enable,
145 error_interrupt_offset);
146 }
147
vnic_wq_error_status(struct vnic_wq * wq)148 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
149 {
150 return ioread32(&wq->ctrl->error_status);
151 }
152
vnic_wq_enable(struct vnic_wq * wq)153 void vnic_wq_enable(struct vnic_wq *wq)
154 {
155 iowrite32(1, &wq->ctrl->enable);
156 }
157
vnic_wq_disable(struct vnic_wq * wq)158 int vnic_wq_disable(struct vnic_wq *wq)
159 {
160 unsigned int wait;
161
162 iowrite32(0, &wq->ctrl->enable);
163
164 /* Wait for HW to ACK disable request */
165 for (wait = 0; wait < 1000; wait++) {
166 if (!(ioread32(&wq->ctrl->running)))
167 return 0;
168 udelay(10);
169 }
170
171 pr_err("Failed to disable WQ[%d]\n", wq->index);
172
173 return -ETIMEDOUT;
174 }
175
vnic_wq_clean(struct vnic_wq * wq,void (* buf_clean)(struct vnic_wq * wq,struct vnic_wq_buf * buf))176 void vnic_wq_clean(struct vnic_wq *wq,
177 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
178 {
179 struct vnic_wq_buf *buf;
180
181 buf = wq->to_clean;
182
183 while (vnic_wq_desc_used(wq) > 0) {
184
185 (*buf_clean)(wq, buf);
186
187 buf = wq->to_clean = buf->next;
188 wq->ring.desc_avail++;
189 }
190
191 wq->to_use = wq->to_clean = wq->bufs[0];
192
193 iowrite32(0, &wq->ctrl->fetch_index);
194 iowrite32(0, &wq->ctrl->posted_index);
195 iowrite32(0, &wq->ctrl->error_status);
196
197 vnic_dev_clear_desc_ring(&wq->ring);
198 }
199