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
vnic_wq_alloc_bufs(struct vnic_wq * wq)27 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
28 {
29 struct vnic_wq_buf *buf;
30 struct vnic_dev *vdev;
31 unsigned int i, j, count = wq->ring.desc_count;
32 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
33
34 vdev = wq->vdev;
35
36 for (i = 0; i < blks; i++) {
37 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
38 if (!wq->bufs[i]) {
39 printk(KERN_ERR "Failed to alloc wq_bufs\n");
40 return -ENOMEM;
41 }
42 }
43
44 for (i = 0; i < blks; i++) {
45 buf = wq->bufs[i];
46 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
47 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
48 buf->desc = (u8 *)wq->ring.descs +
49 wq->ring.desc_size * buf->index;
50 if (buf->index + 1 == count) {
51 buf->next = wq->bufs[0];
52 break;
53 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
54 buf->next = wq->bufs[i + 1];
55 } else {
56 buf->next = buf + 1;
57 buf++;
58 }
59 }
60 }
61
62 wq->to_use = wq->to_clean = wq->bufs[0];
63
64 return 0;
65 }
66
vnic_wq_free(struct vnic_wq * wq)67 void vnic_wq_free(struct vnic_wq *wq)
68 {
69 struct vnic_dev *vdev;
70 unsigned int i;
71
72 vdev = wq->vdev;
73
74 vnic_dev_free_desc_ring(vdev, &wq->ring);
75
76 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
77 kfree(wq->bufs[i]);
78 wq->bufs[i] = NULL;
79 }
80
81 wq->ctrl = NULL;
82
83 }
84
vnic_wq_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)85 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
86 unsigned int desc_count, unsigned int desc_size)
87 {
88 int err;
89
90 wq->index = index;
91 wq->vdev = vdev;
92
93 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
94 if (!wq->ctrl) {
95 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
96 return -EINVAL;
97 }
98
99 vnic_wq_disable(wq);
100
101 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
102 if (err)
103 return err;
104
105 err = vnic_wq_alloc_bufs(wq);
106 if (err) {
107 vnic_wq_free(wq);
108 return err;
109 }
110
111 return 0;
112 }
113
vnic_wq_init(struct vnic_wq * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)114 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
115 unsigned int error_interrupt_enable,
116 unsigned int error_interrupt_offset)
117 {
118 u64 paddr;
119
120 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
121 writeq(paddr, &wq->ctrl->ring_base);
122 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
123 iowrite32(0, &wq->ctrl->fetch_index);
124 iowrite32(0, &wq->ctrl->posted_index);
125 iowrite32(cq_index, &wq->ctrl->cq_index);
126 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
127 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
128 iowrite32(0, &wq->ctrl->error_status);
129 }
130
vnic_wq_error_status(struct vnic_wq * wq)131 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
132 {
133 return ioread32(&wq->ctrl->error_status);
134 }
135
vnic_wq_enable(struct vnic_wq * wq)136 void vnic_wq_enable(struct vnic_wq *wq)
137 {
138 iowrite32(1, &wq->ctrl->enable);
139 }
140
vnic_wq_disable(struct vnic_wq * wq)141 int vnic_wq_disable(struct vnic_wq *wq)
142 {
143 unsigned int wait;
144
145 iowrite32(0, &wq->ctrl->enable);
146
147 /* Wait for HW to ACK disable request */
148 for (wait = 0; wait < 100; wait++) {
149 if (!(ioread32(&wq->ctrl->running)))
150 return 0;
151 udelay(1);
152 }
153
154 printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
155
156 return -ETIMEDOUT;
157 }
158
vnic_wq_clean(struct vnic_wq * wq,void (* buf_clean)(struct vnic_wq * wq,struct vnic_wq_buf * buf))159 void vnic_wq_clean(struct vnic_wq *wq,
160 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
161 {
162 struct vnic_wq_buf *buf;
163
164 BUG_ON(ioread32(&wq->ctrl->enable));
165
166 buf = wq->to_clean;
167
168 while (vnic_wq_desc_used(wq) > 0) {
169
170 (*buf_clean)(wq, buf);
171
172 buf = wq->to_clean = buf->next;
173 wq->ring.desc_avail++;
174 }
175
176 wq->to_use = wq->to_clean = wq->bufs[0];
177
178 iowrite32(0, &wq->ctrl->fetch_index);
179 iowrite32(0, &wq->ctrl->posted_index);
180 iowrite32(0, &wq->ctrl->error_status);
181
182 vnic_dev_clear_desc_ring(&wq->ring);
183 }
184