1 /*
2 * Copyright 2008 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 #include <linux/errno.h>
20 #include <linux/types.h>
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/slab.h>
24 #include "vnic_dev.h"
25 #include "vnic_wq.h"
26
27
vnic_wq_get_ctrl(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,enum vnic_res_type res_type)28 static int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
29 unsigned int index, enum vnic_res_type res_type)
30 {
31 wq->ctrl = vnic_dev_get_res(vdev, res_type, index);
32
33 if (!wq->ctrl)
34 return -EINVAL;
35
36 return 0;
37 }
38
39
vnic_wq_alloc_ring(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int desc_count,unsigned int desc_size)40 static int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
41 unsigned int desc_count, unsigned int desc_size)
42 {
43 return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
44 }
45
46
vnic_wq_alloc_bufs(struct vnic_wq * wq)47 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
48 {
49 struct vnic_wq_buf *buf;
50 unsigned int i, j, count = wq->ring.desc_count;
51 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
52
53 for (i = 0; i < blks; i++) {
54 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
55 if (!wq->bufs[i]) {
56 printk(KERN_ERR "Failed to alloc wq_bufs\n");
57 return -ENOMEM;
58 }
59 }
60
61 for (i = 0; i < blks; i++) {
62 buf = wq->bufs[i];
63 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
64 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
65 buf->desc = (u8 *)wq->ring.descs +
66 wq->ring.desc_size * buf->index;
67 if (buf->index + 1 == count) {
68 buf->next = wq->bufs[0];
69 break;
70 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
71 buf->next = wq->bufs[i + 1];
72 } else {
73 buf->next = buf + 1;
74 buf++;
75 }
76 }
77 }
78
79 wq->to_use = wq->to_clean = wq->bufs[0];
80
81 return 0;
82 }
83
vnic_wq_free(struct vnic_wq * wq)84 void vnic_wq_free(struct vnic_wq *wq)
85 {
86 struct vnic_dev *vdev;
87 unsigned int i;
88
89 vdev = wq->vdev;
90
91 vnic_dev_free_desc_ring(vdev, &wq->ring);
92
93 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
94 kfree(wq->bufs[i]);
95 wq->bufs[i] = NULL;
96 }
97
98 wq->ctrl = NULL;
99
100 }
101
vnic_wq_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)102 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
103 unsigned int desc_count, unsigned int desc_size)
104 {
105 int err;
106
107 wq->index = index;
108 wq->vdev = vdev;
109
110 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
111 if (!wq->ctrl) {
112 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
113 return -EINVAL;
114 }
115
116 vnic_wq_disable(wq);
117
118 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
119 if (err)
120 return err;
121
122 err = vnic_wq_alloc_bufs(wq);
123 if (err) {
124 vnic_wq_free(wq);
125 return err;
126 }
127
128 return 0;
129 }
130
131
vnic_wq_devcmd2_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int desc_count,unsigned int desc_size)132 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
133 unsigned int desc_count, unsigned int desc_size)
134 {
135 int err;
136
137 wq->index = 0;
138 wq->vdev = vdev;
139
140 err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
141 if (err) {
142 pr_err("Failed to get devcmd2 resource\n");
143 return err;
144 }
145 vnic_wq_disable(wq);
146
147 err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
148 if (err)
149 return err;
150 return 0;
151 }
152
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)153 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
154 unsigned int fetch_index, unsigned int posted_index,
155 unsigned int error_interrupt_enable,
156 unsigned int error_interrupt_offset)
157 {
158 u64 paddr;
159 unsigned int count = wq->ring.desc_count;
160
161 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
162 writeq(paddr, &wq->ctrl->ring_base);
163 iowrite32(count, &wq->ctrl->ring_size);
164 iowrite32(fetch_index, &wq->ctrl->fetch_index);
165 iowrite32(posted_index, &wq->ctrl->posted_index);
166 iowrite32(cq_index, &wq->ctrl->cq_index);
167 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
168 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
169 iowrite32(0, &wq->ctrl->error_status);
170
171 wq->to_use = wq->to_clean =
172 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
173 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
174 }
175
176
vnic_wq_init(struct vnic_wq * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)177 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
178 unsigned int error_interrupt_enable,
179 unsigned int error_interrupt_offset)
180 {
181 u64 paddr;
182
183 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
184 writeq(paddr, &wq->ctrl->ring_base);
185 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
186 iowrite32(0, &wq->ctrl->fetch_index);
187 iowrite32(0, &wq->ctrl->posted_index);
188 iowrite32(cq_index, &wq->ctrl->cq_index);
189 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
190 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
191 iowrite32(0, &wq->ctrl->error_status);
192 }
193
vnic_wq_error_status(struct vnic_wq * wq)194 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
195 {
196 return ioread32(&wq->ctrl->error_status);
197 }
198
vnic_wq_enable(struct vnic_wq * wq)199 void vnic_wq_enable(struct vnic_wq *wq)
200 {
201 iowrite32(1, &wq->ctrl->enable);
202 }
203
vnic_wq_disable(struct vnic_wq * wq)204 int vnic_wq_disable(struct vnic_wq *wq)
205 {
206 unsigned int wait;
207
208 iowrite32(0, &wq->ctrl->enable);
209
210 /* Wait for HW to ACK disable request */
211 for (wait = 0; wait < 100; wait++) {
212 if (!(ioread32(&wq->ctrl->running)))
213 return 0;
214 udelay(1);
215 }
216
217 printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
218
219 return -ETIMEDOUT;
220 }
221
vnic_wq_clean(struct vnic_wq * wq,void (* buf_clean)(struct vnic_wq * wq,struct vnic_wq_buf * buf))222 void vnic_wq_clean(struct vnic_wq *wq,
223 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
224 {
225 struct vnic_wq_buf *buf;
226
227 BUG_ON(ioread32(&wq->ctrl->enable));
228
229 buf = wq->to_clean;
230
231 while (vnic_wq_desc_used(wq) > 0) {
232
233 (*buf_clean)(wq, buf);
234
235 buf = wq->to_clean = buf->next;
236 wq->ring.desc_avail++;
237 }
238
239 wq->to_use = wq->to_clean = wq->bufs[0];
240
241 iowrite32(0, &wq->ctrl->fetch_index);
242 iowrite32(0, &wq->ctrl->posted_index);
243 iowrite32(0, &wq->ctrl->error_status);
244
245 vnic_dev_clear_desc_ring(&wq->ring);
246 }
247