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1// SPDX-License-Identifier: GPL-2.0-only2// 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}224