1 /* 2 * Copyright 2008 Cisco Systems, Inc. All rights reserved. 3 * Copyright 2007 Nuova Systems, Inc. All rights reserved. 4 * 5 * This program is free software; you may redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; version 2 of the License. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 16 * SOFTWARE. 17 */ 18 19 #include <linux/errno.h> 20 #include <linux/types.h> 21 #include <linux/pci.h> 22 #include <linux/delay.h> 23 #include <linux/slab.h> 24 #include "vnic_dev.h" 25 #include "vnic_wq.h" 26 27 28 static int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq, 29 unsigned int index, enum vnic_res_type res_type) 30 { 31 wq->ctrl = vnic_dev_get_res(vdev, res_type, index); 32 33 if (!wq->ctrl) 34 return -EINVAL; 35 36 return 0; 37 } 38 39 40 static int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq, 41 unsigned int desc_count, unsigned int desc_size) 42 { 43 return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 44 } 45 46 47 static int vnic_wq_alloc_bufs(struct vnic_wq *wq) 48 { 49 struct vnic_wq_buf *buf; 50 unsigned int i, j, count = wq->ring.desc_count; 51 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 52 53 for (i = 0; i < blks; i++) { 54 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); 55 if (!wq->bufs[i]) { 56 printk(KERN_ERR "Failed to alloc wq_bufs\n"); 57 return -ENOMEM; 58 } 59 } 60 61 for (i = 0; i < blks; i++) { 62 buf = wq->bufs[i]; 63 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) { 64 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j; 65 buf->desc = (u8 *)wq->ring.descs + 66 wq->ring.desc_size * buf->index; 67 if (buf->index + 1 == count) { 68 buf->next = wq->bufs[0]; 69 break; 70 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) { 71 buf->next = wq->bufs[i + 1]; 72 } else { 73 buf->next = buf + 1; 74 buf++; 75 } 76 } 77 } 78 79 wq->to_use = wq->to_clean = wq->bufs[0]; 80 81 return 0; 82 } 83 84 void vnic_wq_free(struct vnic_wq *wq) 85 { 86 struct vnic_dev *vdev; 87 unsigned int i; 88 89 vdev = wq->vdev; 90 91 vnic_dev_free_desc_ring(vdev, &wq->ring); 92 93 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 94 kfree(wq->bufs[i]); 95 wq->bufs[i] = NULL; 96 } 97 98 wq->ctrl = NULL; 99 100 } 101 102 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 103 unsigned int desc_count, unsigned int desc_size) 104 { 105 int err; 106 107 wq->index = index; 108 wq->vdev = vdev; 109 110 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); 111 if (!wq->ctrl) { 112 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index); 113 return -EINVAL; 114 } 115 116 vnic_wq_disable(wq); 117 118 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 119 if (err) 120 return err; 121 122 err = vnic_wq_alloc_bufs(wq); 123 if (err) { 124 vnic_wq_free(wq); 125 return err; 126 } 127 128 return 0; 129 } 130 131 132 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, 133 unsigned int desc_count, unsigned int desc_size) 134 { 135 int err; 136 137 wq->index = 0; 138 wq->vdev = vdev; 139 140 err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2); 141 if (err) { 142 pr_err("Failed to get devcmd2 resource\n"); 143 return err; 144 } 145 vnic_wq_disable(wq); 146 147 err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size); 148 if (err) 149 return err; 150 return 0; 151 } 152 153 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, 154 unsigned int fetch_index, unsigned int posted_index, 155 unsigned int error_interrupt_enable, 156 unsigned int error_interrupt_offset) 157 { 158 u64 paddr; 159 unsigned int count = wq->ring.desc_count; 160 161 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 162 writeq(paddr, &wq->ctrl->ring_base); 163 iowrite32(count, &wq->ctrl->ring_size); 164 iowrite32(fetch_index, &wq->ctrl->fetch_index); 165 iowrite32(posted_index, &wq->ctrl->posted_index); 166 iowrite32(cq_index, &wq->ctrl->cq_index); 167 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 168 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 169 iowrite32(0, &wq->ctrl->error_status); 170 171 wq->to_use = wq->to_clean = 172 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES] 173 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES]; 174 } 175 176 177 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 178 unsigned int error_interrupt_enable, 179 unsigned int error_interrupt_offset) 180 { 181 u64 paddr; 182 183 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 184 writeq(paddr, &wq->ctrl->ring_base); 185 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size); 186 iowrite32(0, &wq->ctrl->fetch_index); 187 iowrite32(0, &wq->ctrl->posted_index); 188 iowrite32(cq_index, &wq->ctrl->cq_index); 189 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 190 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 191 iowrite32(0, &wq->ctrl->error_status); 192 } 193 194 unsigned int vnic_wq_error_status(struct vnic_wq *wq) 195 { 196 return ioread32(&wq->ctrl->error_status); 197 } 198 199 void vnic_wq_enable(struct vnic_wq *wq) 200 { 201 iowrite32(1, &wq->ctrl->enable); 202 } 203 204 int vnic_wq_disable(struct vnic_wq *wq) 205 { 206 unsigned int wait; 207 208 iowrite32(0, &wq->ctrl->enable); 209 210 /* Wait for HW to ACK disable request */ 211 for (wait = 0; wait < 100; wait++) { 212 if (!(ioread32(&wq->ctrl->running))) 213 return 0; 214 udelay(1); 215 } 216 217 printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index); 218 219 return -ETIMEDOUT; 220 } 221 222 void vnic_wq_clean(struct vnic_wq *wq, 223 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 224 { 225 struct vnic_wq_buf *buf; 226 227 BUG_ON(ioread32(&wq->ctrl->enable)); 228 229 buf = wq->to_clean; 230 231 while (vnic_wq_desc_used(wq) > 0) { 232 233 (*buf_clean)(wq, buf); 234 235 buf = wq->to_clean = buf->next; 236 wq->ring.desc_avail++; 237 } 238 239 wq->to_use = wq->to_clean = wq->bufs[0]; 240 241 iowrite32(0, &wq->ctrl->fetch_index); 242 iowrite32(0, &wq->ctrl->posted_index); 243 iowrite32(0, &wq->ctrl->error_status); 244 245 vnic_dev_clear_desc_ring(&wq->ring); 246 } 247