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 12 static 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 22 static 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 29 static 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 67 void 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 85 int 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 } 108 109 int 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 } 139 140 void 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 } 162 163 void 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 } 170 171 unsigned int svnic_wq_error_status(struct vnic_wq *wq) 172 { 173 return ioread32(&wq->ctrl->error_status); 174 } 175 176 void svnic_wq_enable(struct vnic_wq *wq) 177 { 178 iowrite32(1, &wq->ctrl->enable); 179 } 180 181 int 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 } 198 199 void 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