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 16static 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 28static 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 35static 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 72void 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 90int 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 120int 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 141void 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 165void 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 182unsigned int vnic_wq_error_status(struct vnic_wq *wq) 183{ 184 return ioread32(&wq->ctrl->error_status); 185} 186 187void vnic_wq_enable(struct vnic_wq *wq) 188{ 189 iowrite32(1, &wq->ctrl->enable); 190} 191 192int 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 210void 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} 235