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1// SPDX-License-Identifier: GPL-2.0-only2/*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