1 /* 2 * Copyright 2014 Cisco Systems, Inc. All rights reserved. 3 * 4 * This program is free software; you may redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 15 * SOFTWARE. 16 */ 17 18 #include <linux/errno.h> 19 #include <linux/types.h> 20 #include <linux/pci.h> 21 #include <linux/delay.h> 22 #include <linux/slab.h> 23 #include "vnic_dev.h" 24 #include "vnic_wq.h" 25 26 static inline int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq, 27 unsigned int index, enum vnic_res_type res_type) 28 { 29 wq->ctrl = svnic_dev_get_res(vdev, res_type, index); 30 if (!wq->ctrl) 31 return -EINVAL; 32 33 return 0; 34 } 35 36 static inline int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq, 37 unsigned int index, unsigned int desc_count, unsigned int desc_size) 38 { 39 return svnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, 40 desc_size); 41 } 42 43 static int vnic_wq_alloc_bufs(struct vnic_wq *wq) 44 { 45 struct vnic_wq_buf *buf; 46 unsigned int i, j, count = wq->ring.desc_count; 47 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 48 49 for (i = 0; i < blks; i++) { 50 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); 51 if (!wq->bufs[i]) { 52 pr_err("Failed to alloc wq_bufs\n"); 53 54 return -ENOMEM; 55 } 56 } 57 58 for (i = 0; i < blks; i++) { 59 buf = wq->bufs[i]; 60 for (j = 0; j < VNIC_WQ_BUF_DFLT_BLK_ENTRIES; j++) { 61 buf->index = i * VNIC_WQ_BUF_DFLT_BLK_ENTRIES + j; 62 buf->desc = (u8 *)wq->ring.descs + 63 wq->ring.desc_size * buf->index; 64 if (buf->index + 1 == count) { 65 buf->next = wq->bufs[0]; 66 break; 67 } else if (j + 1 == VNIC_WQ_BUF_DFLT_BLK_ENTRIES) { 68 buf->next = wq->bufs[i + 1]; 69 } else { 70 buf->next = buf + 1; 71 buf++; 72 } 73 } 74 } 75 76 wq->to_use = wq->to_clean = wq->bufs[0]; 77 78 return 0; 79 } 80 81 void svnic_wq_free(struct vnic_wq *wq) 82 { 83 struct vnic_dev *vdev; 84 unsigned int i; 85 86 vdev = wq->vdev; 87 88 svnic_dev_free_desc_ring(vdev, &wq->ring); 89 90 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 91 kfree(wq->bufs[i]); 92 wq->bufs[i] = NULL; 93 } 94 95 wq->ctrl = NULL; 96 97 } 98 99 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, 100 unsigned int desc_count, unsigned int desc_size) 101 { 102 int err; 103 104 wq->index = 0; 105 wq->vdev = vdev; 106 107 err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2); 108 if (err) { 109 pr_err("Failed to get devcmd2 resource\n"); 110 111 return err; 112 } 113 114 svnic_wq_disable(wq); 115 116 err = vnic_wq_alloc_ring(vdev, wq, 0, desc_count, desc_size); 117 if (err) 118 return err; 119 120 return 0; 121 } 122 123 int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, 124 unsigned int index, unsigned int desc_count, unsigned int desc_size) 125 { 126 int err; 127 128 wq->index = index; 129 wq->vdev = vdev; 130 131 err = vnic_wq_get_ctrl(vdev, wq, index, RES_TYPE_WQ); 132 if (err) { 133 pr_err("Failed to hook WQ[%d] resource\n", index); 134 135 return err; 136 } 137 138 svnic_wq_disable(wq); 139 140 err = vnic_wq_alloc_ring(vdev, wq, index, desc_count, desc_size); 141 if (err) 142 return err; 143 144 err = vnic_wq_alloc_bufs(wq); 145 if (err) { 146 svnic_wq_free(wq); 147 148 return err; 149 } 150 151 return 0; 152 } 153 154 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, 155 unsigned int fetch_index, unsigned int posted_index, 156 unsigned int error_interrupt_enable, 157 unsigned int error_interrupt_offset) 158 { 159 u64 paddr; 160 unsigned int count = wq->ring.desc_count; 161 162 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 163 writeq(paddr, &wq->ctrl->ring_base); 164 iowrite32(count, &wq->ctrl->ring_size); 165 iowrite32(fetch_index, &wq->ctrl->fetch_index); 166 iowrite32(posted_index, &wq->ctrl->posted_index); 167 iowrite32(cq_index, &wq->ctrl->cq_index); 168 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 169 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 170 iowrite32(0, &wq->ctrl->error_status); 171 172 wq->to_use = wq->to_clean = 173 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)] 174 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)]; 175 } 176 177 void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 178 unsigned int error_interrupt_enable, 179 unsigned int error_interrupt_offset) 180 { 181 vnic_wq_init_start(wq, cq_index, 0, 0, error_interrupt_enable, 182 error_interrupt_offset); 183 } 184 185 unsigned int svnic_wq_error_status(struct vnic_wq *wq) 186 { 187 return ioread32(&wq->ctrl->error_status); 188 } 189 190 void svnic_wq_enable(struct vnic_wq *wq) 191 { 192 iowrite32(1, &wq->ctrl->enable); 193 } 194 195 int svnic_wq_disable(struct vnic_wq *wq) 196 { 197 unsigned int wait; 198 199 iowrite32(0, &wq->ctrl->enable); 200 201 /* Wait for HW to ACK disable request */ 202 for (wait = 0; wait < 100; wait++) { 203 if (!(ioread32(&wq->ctrl->running))) 204 return 0; 205 udelay(1); 206 } 207 208 pr_err("Failed to disable WQ[%d]\n", wq->index); 209 210 return -ETIMEDOUT; 211 } 212 213 void svnic_wq_clean(struct vnic_wq *wq, 214 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 215 { 216 struct vnic_wq_buf *buf; 217 218 BUG_ON(ioread32(&wq->ctrl->enable)); 219 220 buf = wq->to_clean; 221 222 while (svnic_wq_desc_used(wq) > 0) { 223 224 (*buf_clean)(wq, buf); 225 226 buf = wq->to_clean = buf->next; 227 wq->ring.desc_avail++; 228 } 229 230 wq->to_use = wq->to_clean = wq->bufs[0]; 231 232 iowrite32(0, &wq->ctrl->fetch_index); 233 iowrite32(0, &wq->ctrl->posted_index); 234 iowrite32(0, &wq->ctrl->error_status); 235 236 svnic_dev_clear_desc_ring(&wq->ring); 237 } 238