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vnic_wq.c
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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 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 
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 
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 
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 
131 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
132 {
133  return ioread32(&wq->ctrl->error_status);
134 }
135 
136 void vnic_wq_enable(struct vnic_wq *wq)
137 {
138  iowrite32(1, &wq->ctrl->enable);
139 }
140 
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 
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 
183 }