blob: df61bd932ea622ef71b591406383f749db3f7fba [file] [log] [blame]
Scott Feldman01f2e4e2008-09-15 09:17:11 -07001/*
Vasanthy Kolluri29046f92010-06-24 10:52:26 +00002 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
Scott Feldman01f2e4e2008-09-15 09:17:11 -07003 * 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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Scott Feldman01f2e4e2008-09-15 09:17:11 -070026
27#include "vnic_dev.h"
28#include "vnic_wq.h"
29
30static 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++) {
Vasanthy Kollurib5bab852010-06-24 10:51:51 +000040 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC);
Scott Feldman01f2e4e2008-09-15 09:17:11 -070041 if (!wq->bufs[i]) {
Vasanthy Kolluria7a79de2010-06-24 10:50:56 +000042 pr_err("Failed to alloc wq_bufs\n");
Scott Feldman01f2e4e2008-09-15 09:17:11 -070043 return -ENOMEM;
44 }
45 }
46
47 for (i = 0; i < blks; i++) {
48 buf = wq->bufs[i];
Vasanthy Kollurib5bab852010-06-24 10:51:51 +000049 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
50 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
Scott Feldman01f2e4e2008-09-15 09:17:11 -070051 buf->desc = (u8 *)wq->ring.descs +
52 wq->ring.desc_size * buf->index;
53 if (buf->index + 1 == count) {
54 buf->next = wq->bufs[0];
55 break;
Vasanthy Kollurib5bab852010-06-24 10:51:51 +000056 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
Scott Feldman01f2e4e2008-09-15 09:17:11 -070057 buf->next = wq->bufs[i + 1];
58 } else {
59 buf->next = buf + 1;
60 buf++;
61 }
62 }
63 }
64
65 wq->to_use = wq->to_clean = wq->bufs[0];
66
67 return 0;
68}
69
70void vnic_wq_free(struct vnic_wq *wq)
71{
72 struct vnic_dev *vdev;
73 unsigned int i;
74
75 vdev = wq->vdev;
76
77 vnic_dev_free_desc_ring(vdev, &wq->ring);
78
79 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
Roopa Prabhu83217792010-08-10 18:55:20 +000080 if (wq->bufs[i]) {
81 kfree(wq->bufs[i]);
82 wq->bufs[i] = NULL;
83 }
Scott Feldman01f2e4e2008-09-15 09:17:11 -070084 }
85
86 wq->ctrl = NULL;
87}
88
89int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
90 unsigned int desc_count, unsigned int desc_size)
91{
92 int err;
93
94 wq->index = index;
95 wq->vdev = vdev;
96
97 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
98 if (!wq->ctrl) {
Vasanthy Kolluria7a79de2010-06-24 10:50:56 +000099 pr_err("Failed to hook WQ[%d] resource\n", index);
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700100 return -EINVAL;
101 }
102
103 vnic_wq_disable(wq);
104
105 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
106 if (err)
107 return err;
108
109 err = vnic_wq_alloc_bufs(wq);
110 if (err) {
111 vnic_wq_free(wq);
112 return err;
113 }
114
115 return 0;
116}
117
Vasanthy Kolluri2fdba382010-09-30 13:35:45 +0000118static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
Scott Feldman6fdfa972009-09-03 17:02:45 +0000119 unsigned int fetch_index, unsigned int posted_index,
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700120 unsigned int error_interrupt_enable,
121 unsigned int error_interrupt_offset)
122{
123 u64 paddr;
Vasanthy Kollurib5bab852010-06-24 10:51:51 +0000124 unsigned int count = wq->ring.desc_count;
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700125
126 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
127 writeq(paddr, &wq->ctrl->ring_base);
Vasanthy Kollurib5bab852010-06-24 10:51:51 +0000128 iowrite32(count, &wq->ctrl->ring_size);
Scott Feldman6fdfa972009-09-03 17:02:45 +0000129 iowrite32(fetch_index, &wq->ctrl->fetch_index);
130 iowrite32(posted_index, &wq->ctrl->posted_index);
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700131 iowrite32(cq_index, &wq->ctrl->cq_index);
132 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
133 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
134 iowrite32(0, &wq->ctrl->error_status);
Scott Feldman6fdfa972009-09-03 17:02:45 +0000135
136 wq->to_use = wq->to_clean =
Vasanthy Kollurib5bab852010-06-24 10:51:51 +0000137 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
138 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
Scott Feldman6fdfa972009-09-03 17:02:45 +0000139}
140
141void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
142 unsigned int error_interrupt_enable,
143 unsigned int error_interrupt_offset)
144{
145 vnic_wq_init_start(wq, cq_index, 0, 0,
146 error_interrupt_enable,
147 error_interrupt_offset);
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700148}
149
150unsigned int vnic_wq_error_status(struct vnic_wq *wq)
151{
152 return ioread32(&wq->ctrl->error_status);
153}
154
155void vnic_wq_enable(struct vnic_wq *wq)
156{
157 iowrite32(1, &wq->ctrl->enable);
158}
159
160int vnic_wq_disable(struct vnic_wq *wq)
161{
162 unsigned int wait;
163
164 iowrite32(0, &wq->ctrl->enable);
165
166 /* Wait for HW to ACK disable request */
Vasanthy Kollurib6d24eb2010-03-18 16:19:49 +0000167 for (wait = 0; wait < 1000; wait++) {
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700168 if (!(ioread32(&wq->ctrl->running)))
169 return 0;
Vasanthy Kollurib6d24eb2010-03-18 16:19:49 +0000170 udelay(10);
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700171 }
172
Vasanthy Kolluria7a79de2010-06-24 10:50:56 +0000173 pr_err("Failed to disable WQ[%d]\n", wq->index);
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700174
175 return -ETIMEDOUT;
176}
177
178void vnic_wq_clean(struct vnic_wq *wq,
179 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
180{
181 struct vnic_wq_buf *buf;
182
Scott Feldman01f2e4e2008-09-15 09:17:11 -0700183 buf = wq->to_clean;
184
185 while (vnic_wq_desc_used(wq) > 0) {
186
187 (*buf_clean)(wq, buf);
188
189 buf = wq->to_clean = buf->next;
190 wq->ring.desc_avail++;
191 }
192
193 wq->to_use = wq->to_clean = wq->bufs[0];
194
195 iowrite32(0, &wq->ctrl->fetch_index);
196 iowrite32(0, &wq->ctrl->posted_index);
197 iowrite32(0, &wq->ctrl->error_status);
198
199 vnic_dev_clear_desc_ring(&wq->ring);
200}