1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
4 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 */
6
7#include <linux/errno.h>
8#include <linux/types.h>
9#include <linux/pci.h>
10#include <linux/delay.h>
11#include <linux/slab.h>
12#include "vnic_dev.h"
13#include "vnic_wq.h"
14
15
16static int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
17 unsigned int index, enum vnic_res_type res_type)
18{
19 wq->ctrl = vnic_dev_get_res(vdev, type: res_type, index);
20
21 if (!wq->ctrl)
22 return -EINVAL;
23
24 return 0;
25}
26
27
28static int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
29 unsigned int desc_count, unsigned int desc_size)
30{
31 return vnic_dev_alloc_desc_ring(vdev, ring: &wq->ring, desc_count, desc_size);
32}
33
34
35static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
36{
37 struct vnic_wq_buf *buf;
38 unsigned int i, j, count = wq->ring.desc_count;
39 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
40
41 for (i = 0; i < blks; i++) {
42 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
43 if (!wq->bufs[i]) {
44 printk(KERN_ERR "Failed to alloc wq_bufs\n");
45 return -ENOMEM;
46 }
47 }
48
49 for (i = 0; i < blks; i++) {
50 buf = wq->bufs[i];
51 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
52 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
53 buf->desc = (u8 *)wq->ring.descs +
54 wq->ring.desc_size * buf->index;
55 if (buf->index + 1 == count) {
56 buf->next = wq->bufs[0];
57 break;
58 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
59 buf->next = wq->bufs[i + 1];
60 } else {
61 buf->next = buf + 1;
62 buf++;
63 }
64 }
65 }
66
67 wq->to_use = wq->to_clean = wq->bufs[0];
68
69 return 0;
70}
71
72void vnic_wq_free(struct vnic_wq *wq)
73{
74 struct vnic_dev *vdev;
75 unsigned int i;
76
77 vdev = wq->vdev;
78
79 vnic_dev_free_desc_ring(vdev, ring: &wq->ring);
80
81 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
82 kfree(objp: wq->bufs[i]);
83 wq->bufs[i] = NULL;
84 }
85
86 wq->ctrl = NULL;
87
88}
89
90int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
91 unsigned int desc_count, unsigned int desc_size)
92{
93 int err;
94
95 wq->index = index;
96 wq->vdev = vdev;
97
98 wq->ctrl = vnic_dev_get_res(vdev, type: RES_TYPE_WQ, index);
99 if (!wq->ctrl) {
100 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
101 return -EINVAL;
102 }
103
104 vnic_wq_disable(wq);
105
106 err = vnic_dev_alloc_desc_ring(vdev, ring: &wq->ring, desc_count, desc_size);
107 if (err)
108 return err;
109
110 err = vnic_wq_alloc_bufs(wq);
111 if (err) {
112 vnic_wq_free(wq);
113 return err;
114 }
115
116 return 0;
117}
118
119
120int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
121 unsigned int desc_count, unsigned int desc_size)
122{
123 int err;
124
125 wq->index = 0;
126 wq->vdev = vdev;
127
128 err = vnic_wq_get_ctrl(vdev, wq, index: 0, res_type: RES_TYPE_DEVCMD2);
129 if (err) {
130 pr_err("Failed to get devcmd2 resource\n");
131 return err;
132 }
133 vnic_wq_disable(wq);
134
135 err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
136 if (err)
137 return err;
138 return 0;
139}
140
141void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
142 unsigned int fetch_index, unsigned int posted_index,
143 unsigned int error_interrupt_enable,
144 unsigned int error_interrupt_offset)
145{
146 u64 paddr;
147 unsigned int count = wq->ring.desc_count;
148
149 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
150 writeq(val: paddr, addr: &wq->ctrl->ring_base);
151 iowrite32(count, &wq->ctrl->ring_size);
152 iowrite32(fetch_index, &wq->ctrl->fetch_index);
153 iowrite32(posted_index, &wq->ctrl->posted_index);
154 iowrite32(cq_index, &wq->ctrl->cq_index);
155 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
156 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
157 iowrite32(0, &wq->ctrl->error_status);
158
159 wq->to_use = wq->to_clean =
160 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
161 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
162}
163
164
165void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
166 unsigned int error_interrupt_enable,
167 unsigned int error_interrupt_offset)
168{
169 u64 paddr;
170
171 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
172 writeq(val: paddr, addr: &wq->ctrl->ring_base);
173 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
174 iowrite32(0, &wq->ctrl->fetch_index);
175 iowrite32(0, &wq->ctrl->posted_index);
176 iowrite32(cq_index, &wq->ctrl->cq_index);
177 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
178 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
179 iowrite32(0, &wq->ctrl->error_status);
180}
181
182unsigned int vnic_wq_error_status(struct vnic_wq *wq)
183{
184 return ioread32(&wq->ctrl->error_status);
185}
186
187void vnic_wq_enable(struct vnic_wq *wq)
188{
189 iowrite32(1, &wq->ctrl->enable);
190}
191
192int vnic_wq_disable(struct vnic_wq *wq)
193{
194 unsigned int wait;
195
196 iowrite32(0, &wq->ctrl->enable);
197
198 /* Wait for HW to ACK disable request */
199 for (wait = 0; wait < 100; wait++) {
200 if (!(ioread32(&wq->ctrl->running)))
201 return 0;
202 udelay(1);
203 }
204
205 printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
206
207 return -ETIMEDOUT;
208}
209
210void vnic_wq_clean(struct vnic_wq *wq,
211 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
212{
213 struct vnic_wq_buf *buf;
214
215 BUG_ON(ioread32(&wq->ctrl->enable));
216
217 buf = wq->to_clean;
218
219 while (vnic_wq_desc_used(wq) > 0) {
220
221 (*buf_clean)(wq, buf);
222
223 buf = wq->to_clean = buf->next;
224 wq->ring.desc_avail++;
225 }
226
227 wq->to_use = wq->to_clean = wq->bufs[0];
228
229 iowrite32(0, &wq->ctrl->fetch_index);
230 iowrite32(0, &wq->ctrl->posted_index);
231 iowrite32(0, &wq->ctrl->error_status);
232
233 vnic_dev_clear_desc_ring(ring: &wq->ring);
234}
235

source code of linux/drivers/scsi/fnic/vnic_wq.c