1 /*
2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
3  * 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 #include <linux/errno.h>
20 #include <linux/types.h>
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <linux/slab.h>
24 #include "vnic_dev.h"
25 #include "vnic_wq.h"
26 
27 
vnic_wq_get_ctrl(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,enum vnic_res_type res_type)28 static int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
29 		unsigned int index, enum vnic_res_type res_type)
30 {
31 	wq->ctrl = vnic_dev_get_res(vdev, res_type, index);
32 
33 	if (!wq->ctrl)
34 		return -EINVAL;
35 
36 	return 0;
37 }
38 
39 
vnic_wq_alloc_ring(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int desc_count,unsigned int desc_size)40 static int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
41 		unsigned int desc_count, unsigned int desc_size)
42 {
43 	return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
44 }
45 
46 
vnic_wq_alloc_bufs(struct vnic_wq * wq)47 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
48 {
49 	struct vnic_wq_buf *buf;
50 	unsigned int i, j, count = wq->ring.desc_count;
51 	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
52 
53 	for (i = 0; i < blks; i++) {
54 		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
55 		if (!wq->bufs[i]) {
56 			printk(KERN_ERR "Failed to alloc wq_bufs\n");
57 			return -ENOMEM;
58 		}
59 	}
60 
61 	for (i = 0; i < blks; i++) {
62 		buf = wq->bufs[i];
63 		for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
64 			buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
65 			buf->desc = (u8 *)wq->ring.descs +
66 				wq->ring.desc_size * buf->index;
67 			if (buf->index + 1 == count) {
68 				buf->next = wq->bufs[0];
69 				break;
70 			} else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
71 				buf->next = wq->bufs[i + 1];
72 			} else {
73 				buf->next = buf + 1;
74 				buf++;
75 			}
76 		}
77 	}
78 
79 	wq->to_use = wq->to_clean = wq->bufs[0];
80 
81 	return 0;
82 }
83 
vnic_wq_free(struct vnic_wq * wq)84 void vnic_wq_free(struct vnic_wq *wq)
85 {
86 	struct vnic_dev *vdev;
87 	unsigned int i;
88 
89 	vdev = wq->vdev;
90 
91 	vnic_dev_free_desc_ring(vdev, &wq->ring);
92 
93 	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
94 		kfree(wq->bufs[i]);
95 		wq->bufs[i] = NULL;
96 	}
97 
98 	wq->ctrl = NULL;
99 
100 }
101 
vnic_wq_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int index,unsigned int desc_count,unsigned int desc_size)102 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
103 	unsigned int desc_count, unsigned int desc_size)
104 {
105 	int err;
106 
107 	wq->index = index;
108 	wq->vdev = vdev;
109 
110 	wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
111 	if (!wq->ctrl) {
112 		printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
113 		return -EINVAL;
114 	}
115 
116 	vnic_wq_disable(wq);
117 
118 	err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
119 	if (err)
120 		return err;
121 
122 	err = vnic_wq_alloc_bufs(wq);
123 	if (err) {
124 		vnic_wq_free(wq);
125 		return err;
126 	}
127 
128 	return 0;
129 }
130 
131 
vnic_wq_devcmd2_alloc(struct vnic_dev * vdev,struct vnic_wq * wq,unsigned int desc_count,unsigned int desc_size)132 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
133 		unsigned int desc_count, unsigned int desc_size)
134 {
135 	int err;
136 
137 	wq->index = 0;
138 	wq->vdev = vdev;
139 
140 	err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
141 	if (err) {
142 		pr_err("Failed to get devcmd2 resource\n");
143 		return err;
144 	}
145 	vnic_wq_disable(wq);
146 
147 	err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
148 	if (err)
149 		return err;
150 	return 0;
151 }
152 
vnic_wq_init_start(struct vnic_wq * wq,unsigned int cq_index,unsigned int fetch_index,unsigned int posted_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)153 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
154 		unsigned int fetch_index, unsigned int posted_index,
155 		unsigned int error_interrupt_enable,
156 		unsigned int error_interrupt_offset)
157 {
158 	u64 paddr;
159 	unsigned int count = wq->ring.desc_count;
160 
161 	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
162 	writeq(paddr, &wq->ctrl->ring_base);
163 	iowrite32(count, &wq->ctrl->ring_size);
164 	iowrite32(fetch_index, &wq->ctrl->fetch_index);
165 	iowrite32(posted_index, &wq->ctrl->posted_index);
166 	iowrite32(cq_index, &wq->ctrl->cq_index);
167 	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
168 	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
169 	iowrite32(0, &wq->ctrl->error_status);
170 
171 	wq->to_use = wq->to_clean =
172 		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
173 		[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
174 }
175 
176 
vnic_wq_init(struct vnic_wq * wq,unsigned int cq_index,unsigned int error_interrupt_enable,unsigned int error_interrupt_offset)177 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
178 	unsigned int error_interrupt_enable,
179 	unsigned int error_interrupt_offset)
180 {
181 	u64 paddr;
182 
183 	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
184 	writeq(paddr, &wq->ctrl->ring_base);
185 	iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
186 	iowrite32(0, &wq->ctrl->fetch_index);
187 	iowrite32(0, &wq->ctrl->posted_index);
188 	iowrite32(cq_index, &wq->ctrl->cq_index);
189 	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
190 	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
191 	iowrite32(0, &wq->ctrl->error_status);
192 }
193 
vnic_wq_error_status(struct vnic_wq * wq)194 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
195 {
196 	return ioread32(&wq->ctrl->error_status);
197 }
198 
vnic_wq_enable(struct vnic_wq * wq)199 void vnic_wq_enable(struct vnic_wq *wq)
200 {
201 	iowrite32(1, &wq->ctrl->enable);
202 }
203 
vnic_wq_disable(struct vnic_wq * wq)204 int vnic_wq_disable(struct vnic_wq *wq)
205 {
206 	unsigned int wait;
207 
208 	iowrite32(0, &wq->ctrl->enable);
209 
210 	/* Wait for HW to ACK disable request */
211 	for (wait = 0; wait < 100; wait++) {
212 		if (!(ioread32(&wq->ctrl->running)))
213 			return 0;
214 		udelay(1);
215 	}
216 
217 	printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
218 
219 	return -ETIMEDOUT;
220 }
221 
vnic_wq_clean(struct vnic_wq * wq,void (* buf_clean)(struct vnic_wq * wq,struct vnic_wq_buf * buf))222 void vnic_wq_clean(struct vnic_wq *wq,
223 	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
224 {
225 	struct vnic_wq_buf *buf;
226 
227 	BUG_ON(ioread32(&wq->ctrl->enable));
228 
229 	buf = wq->to_clean;
230 
231 	while (vnic_wq_desc_used(wq) > 0) {
232 
233 		(*buf_clean)(wq, buf);
234 
235 		buf = wq->to_clean = buf->next;
236 		wq->ring.desc_avail++;
237 	}
238 
239 	wq->to_use = wq->to_clean = wq->bufs[0];
240 
241 	iowrite32(0, &wq->ctrl->fetch_index);
242 	iowrite32(0, &wq->ctrl->posted_index);
243 	iowrite32(0, &wq->ctrl->error_status);
244 
245 	vnic_dev_clear_desc_ring(&wq->ring);
246 }
247