treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_168.RULE (part 1)
[platform/kernel/linux-starfive.git] / drivers / scsi / fnic / vnic_wq.c
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
16 static 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, res_type, index);
20
21         if (!wq->ctrl)
22                 return -EINVAL;
23
24         return 0;
25 }
26
27
28 static 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, &wq->ring, desc_count, desc_size);
32 }
33
34
35 static 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
72 void 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, &wq->ring);
80
81         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
82                 kfree(wq->bufs[i]);
83                 wq->bufs[i] = NULL;
84         }
85
86         wq->ctrl = NULL;
87
88 }
89
90 int 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, 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, &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
120 int 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, 0, 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
141 void 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(paddr, &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
165 void 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(paddr, &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
182 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
183 {
184         return ioread32(&wq->ctrl->error_status);
185 }
186
187 void vnic_wq_enable(struct vnic_wq *wq)
188 {
189         iowrite32(1, &wq->ctrl->enable);
190 }
191
192 int 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
210 void 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(&wq->ring);
234 }