1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
5  */
6 
7 #include <linux/kernel.h>
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/delay.h>
12 #include <linux/slab.h>
13 
14 #include "vnic_dev.h"
15 #include "vnic_wq.h"
16 #include "enic.h"
17 
18 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
19 {
20 	struct vnic_wq_buf *buf;
21 	unsigned int i, j, count = wq->ring.desc_count;
22 	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
23 
24 	for (i = 0; i < blks; i++) {
25 		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_KERNEL);
26 		if (!wq->bufs[i])
27 			return -ENOMEM;
28 	}
29 
30 	for (i = 0; i < blks; i++) {
31 		buf = wq->bufs[i];
32 		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) {
33 			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j;
34 			buf->desc = (u8 *)wq->ring.descs +
35 				wq->ring.desc_size * buf->index;
36 			if (buf->index + 1 == count) {
37 				buf->next = wq->bufs[0];
38 				buf->next->prev = buf;
39 				break;
40 			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) {
41 				buf->next = wq->bufs[i + 1];
42 				buf->next->prev = buf;
43 			} else {
44 				buf->next = buf + 1;
45 				buf->next->prev = buf;
46 				buf++;
47 			}
48 		}
49 	}
50 
51 	wq->to_use = wq->to_clean = wq->bufs[0];
52 
53 	return 0;
54 }
55 
56 void vnic_wq_free(struct vnic_wq *wq)
57 {
58 	struct vnic_dev *vdev;
59 	unsigned int i;
60 
61 	vdev = wq->vdev;
62 
63 	vnic_dev_free_desc_ring(vdev, &wq->ring);
64 
65 	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
66 		if (wq->bufs[i]) {
67 			kfree(wq->bufs[i]);
68 			wq->bufs[i] = NULL;
69 		}
70 	}
71 
72 	wq->ctrl = NULL;
73 }
74 
75 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
76 	unsigned int desc_count, unsigned int desc_size)
77 {
78 	int err;
79 
80 	wq->index = index;
81 	wq->vdev = vdev;
82 
83 	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
84 	if (!wq->ctrl) {
85 		vdev_err(vdev, "Failed to hook WQ[%d] resource\n", index);
86 		return -EINVAL;
87 	}
88 
89 	vnic_wq_disable(wq);
90 
91 	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
92 	if (err)
93 		return err;
94 
95 	err = vnic_wq_alloc_bufs(wq);
96 	if (err) {
97 		vnic_wq_free(wq);
98 		return err;
99 	}
100 
101 	return 0;
102 }
103 
104 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
105 			  unsigned int desc_count, unsigned int desc_size)
106 {
107 	int err;
108 
109 	wq->index = 0;
110 	wq->vdev = vdev;
111 
112 	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_DEVCMD2, 0);
113 	if (!wq->ctrl)
114 		return -EINVAL;
115 	vnic_wq_disable(wq);
116 	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
117 
118 	return err;
119 }
120 
121 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
122 			unsigned int fetch_index, unsigned int posted_index,
123 			unsigned int error_interrupt_enable,
124 			unsigned int error_interrupt_offset)
125 {
126 	u64 paddr;
127 	unsigned int count = wq->ring.desc_count;
128 
129 	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
130 	writeq(paddr, &wq->ctrl->ring_base);
131 	iowrite32(count, &wq->ctrl->ring_size);
132 	iowrite32(fetch_index, &wq->ctrl->fetch_index);
133 	iowrite32(posted_index, &wq->ctrl->posted_index);
134 	iowrite32(cq_index, &wq->ctrl->cq_index);
135 	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
136 	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
137 	iowrite32(0, &wq->ctrl->error_status);
138 
139 	wq->to_use = wq->to_clean =
140 		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
141 			[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
142 }
143 
144 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
145 	unsigned int error_interrupt_enable,
146 	unsigned int error_interrupt_offset)
147 {
148 	enic_wq_init_start(wq, cq_index, 0, 0,
149 		error_interrupt_enable,
150 		error_interrupt_offset);
151 }
152 
153 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
154 {
155 	return ioread32(&wq->ctrl->error_status);
156 }
157 
158 void vnic_wq_enable(struct vnic_wq *wq)
159 {
160 	iowrite32(1, &wq->ctrl->enable);
161 }
162 
163 int vnic_wq_disable(struct vnic_wq *wq)
164 {
165 	unsigned int wait;
166 	struct vnic_dev *vdev = wq->vdev;
167 
168 	iowrite32(0, &wq->ctrl->enable);
169 
170 	/* Wait for HW to ACK disable request */
171 	for (wait = 0; wait < 1000; wait++) {
172 		if (!(ioread32(&wq->ctrl->running)))
173 			return 0;
174 		udelay(10);
175 	}
176 
177 	vdev_neterr(vdev, "Failed to disable WQ[%d]\n", wq->index);
178 
179 	return -ETIMEDOUT;
180 }
181 
182 void vnic_wq_clean(struct vnic_wq *wq,
183 	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
184 {
185 	struct vnic_wq_buf *buf;
186 
187 	buf = wq->to_clean;
188 
189 	while (vnic_wq_desc_used(wq) > 0) {
190 
191 		(*buf_clean)(wq, buf);
192 
193 		buf = wq->to_clean = buf->next;
194 		wq->ring.desc_avail++;
195 	}
196 
197 	wq->to_use = wq->to_clean = wq->bufs[0];
198 
199 	iowrite32(0, &wq->ctrl->fetch_index);
200 	iowrite32(0, &wq->ctrl->posted_index);
201 	iowrite32(0, &wq->ctrl->error_status);
202 
203 	vnic_dev_clear_desc_ring(&wq->ring);
204 }
205