Narsimhulu Musini | c8806b6 | 2015-05-29 01:04:01 -0700 | [diff] [blame^] | 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 | } |