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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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
5df6d737 AJ |
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 | ||
182 | vnic_dev_clear_desc_ring(&wq->ring); | |
183 | } |