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, type: 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, ring: &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, 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 | |
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, 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 | |
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, 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 | |
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(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 | |
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(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 | |
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(ring: &wq->ring); |
234 | } |
235 | |