vnic_wq.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2// Copyright 2014 Cisco Systems, Inc.  All rights reserved.
  3
  4#include <linux/errno.h>
  5#include <linux/types.h>
  6#include <linux/pci.h>
  7#include <linux/delay.h>
  8#include <linux/slab.h>
  9#include "vnic_dev.h"
 10#include "vnic_wq.h"
 11
 12static inline int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
 13	unsigned int index, enum vnic_res_type res_type)
 14{
 15	wq->ctrl = svnic_dev_get_res(vdev, res_type, index);
 16	if (!wq->ctrl)
 17		return -EINVAL;
 18
 19	return 0;
 20}
 21
 22static inline int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
 23	unsigned int index, unsigned int desc_count, unsigned int desc_size)
 24{
 25	return svnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count,
 26					 desc_size);
 27}
 28
 29static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
 30{
 31	struct vnic_wq_buf *buf;
 32	unsigned int i, j, count = wq->ring.desc_count;
 33	unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
 34
 35	for (i = 0; i < blks; i++) {
 36		wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
 37		if (!wq->bufs[i]) {
 38			pr_err("Failed to alloc wq_bufs\n");
 39
 40			return -ENOMEM;
 41		}
 42	}
 43
 44	for (i = 0; i < blks; i++) {
 45		buf = wq->bufs[i];
 46		for (j = 0; j < VNIC_WQ_BUF_DFLT_BLK_ENTRIES; j++) {
 47			buf->index = i * VNIC_WQ_BUF_DFLT_BLK_ENTRIES + j;
 48			buf->desc = (u8 *)wq->ring.descs +
 49				wq->ring.desc_size * buf->index;
 50			if (buf->index + 1 == count) {
 51				buf->next = wq->bufs[0];
 52				break;
 53			} else if (j + 1 == VNIC_WQ_BUF_DFLT_BLK_ENTRIES) {
 54				buf->next = wq->bufs[i + 1];
 55			} else {
 56				buf->next = buf + 1;
 57				buf++;
 58			}
 59		}
 60	}
 61
 62	wq->to_use = wq->to_clean = wq->bufs[0];
 63
 64	return 0;
 65}
 66
 67void svnic_wq_free(struct vnic_wq *wq)
 68{
 69	struct vnic_dev *vdev;
 70	unsigned int i;
 71
 72	vdev = wq->vdev;
 73
 74	svnic_dev_free_desc_ring(vdev, &wq->ring);
 75
 76	for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
 77		kfree(wq->bufs[i]);
 78		wq->bufs[i] = NULL;
 79	}
 80
 81	wq->ctrl = NULL;
 82
 83}
 84
 85int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
 86	unsigned int desc_count, unsigned int desc_size)
 87{
 88	int err;
 89
 90	wq->index = 0;
 91	wq->vdev = vdev;
 92
 93	err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
 94	if (err) {
 95		pr_err("Failed to get devcmd2 resource\n");
 96
 97		return err;
 98	}
 99
100	svnic_wq_disable(wq);
101
102	err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size);
103	if (err)
104		return err;
105
106	return 0;
107}
108
109int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
110	unsigned int index, unsigned int desc_count, unsigned int desc_size)
111{
112	int err;
113
114	wq->index = index;
115	wq->vdev = vdev;
116
117	err = vnic_wq_get_ctrl(vdev, wq, index, RES_TYPE_WQ);
118	if (err) {
119		pr_err("Failed to hook WQ[%d] resource\n", index);
120
121		return err;
122	}
123
124	svnic_wq_disable(wq);
125
126	err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size);
127	if (err)
128		return err;
129
130	err = vnic_wq_alloc_bufs(wq);
131	if (err) {
132		svnic_wq_free(wq);
133
134		return err;
135	}
136
137	return 0;
138}
139
140void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
141	unsigned int fetch_index, unsigned int posted_index,
142	unsigned int error_interrupt_enable,
143	unsigned int error_interrupt_offset)
144{
145	u64 paddr;
146	unsigned int count = wq->ring.desc_count;
147
148	paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
149	writeq(paddr, &wq->ctrl->ring_base);
150	iowrite32(count, &wq->ctrl->ring_size);
151	iowrite32(fetch_index, &wq->ctrl->fetch_index);
152	iowrite32(posted_index, &wq->ctrl->posted_index);
153	iowrite32(cq_index, &wq->ctrl->cq_index);
154	iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
155	iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
156	iowrite32(0, &wq->ctrl->error_status);
157
158	wq->to_use = wq->to_clean =
159		&wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)]
160			[fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)];
161}
162
163void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
164	unsigned int error_interrupt_enable,
165	unsigned int error_interrupt_offset)
166{
167	vnic_wq_init_start(wq, cq_index, 0, 0, error_interrupt_enable,
168			   error_interrupt_offset);
169}
170
171unsigned int svnic_wq_error_status(struct vnic_wq *wq)
172{
173	return ioread32(&wq->ctrl->error_status);
174}
175
176void svnic_wq_enable(struct vnic_wq *wq)
177{
178	iowrite32(1, &wq->ctrl->enable);
179}
180
181int svnic_wq_disable(struct vnic_wq *wq)
182{
183	unsigned int wait;
184
185	iowrite32(0, &wq->ctrl->enable);
186
187	/* Wait for HW to ACK disable request */
188	for (wait = 0; wait < 100; wait++) {
189		if (!(ioread32(&wq->ctrl->running)))
190			return 0;
191		udelay(1);
192	}
193
194	pr_err("Failed to disable WQ[%d]\n", wq->index);
195
196	return -ETIMEDOUT;
197}
198
199void svnic_wq_clean(struct vnic_wq *wq,
200	void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
201{
202	struct vnic_wq_buf *buf;
203
204	BUG_ON(ioread32(&wq->ctrl->enable));
205
206	buf = wq->to_clean;
207
208	while (svnic_wq_desc_used(wq) > 0) {
209
210		(*buf_clean)(wq, buf);
211
212		buf = wq->to_clean = buf->next;
213		wq->ring.desc_avail++;
214	}
215
216	wq->to_use = wq->to_clean = wq->bufs[0];
217
218	iowrite32(0, &wq->ctrl->fetch_index);
219	iowrite32(0, &wq->ctrl->posted_index);
220	iowrite32(0, &wq->ctrl->error_status);
221
222	svnic_dev_clear_desc_ring(&wq->ring);
223}