1 /* 2 * Copyright 2008-2010 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 20 #include <linux/kernel.h> 21 #include <linux/errno.h> 22 #include <linux/types.h> 23 #include <linux/pci.h> 24 #include <linux/delay.h> 25 #include <linux/slab.h> 26 27 #include "vnic_dev.h" 28 #include "vnic_wq.h" 29 30 static int vnic_wq_alloc_bufs(struct vnic_wq *wq) 31 { 32 struct vnic_wq_buf *buf; 33 struct vnic_dev *vdev; 34 unsigned int i, j, count = wq->ring.desc_count; 35 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 36 37 vdev = wq->vdev; 38 39 for (i = 0; i < blks; i++) { 40 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ(count), GFP_ATOMIC); 41 if (!wq->bufs[i]) { 42 pr_err("Failed to alloc wq_bufs\n"); 43 return -ENOMEM; 44 } 45 } 46 47 for (i = 0; i < blks; i++) { 48 buf = wq->bufs[i]; 49 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES(count); j++) { 50 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES(count) + j; 51 buf->desc = (u8 *)wq->ring.descs + 52 wq->ring.desc_size * buf->index; 53 if (buf->index + 1 == count) { 54 buf->next = wq->bufs[0]; 55 break; 56 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES(count)) { 57 buf->next = wq->bufs[i + 1]; 58 } else { 59 buf->next = buf + 1; 60 buf++; 61 } 62 } 63 } 64 65 wq->to_use = wq->to_clean = wq->bufs[0]; 66 67 return 0; 68 } 69 70 void vnic_wq_free(struct vnic_wq *wq) 71 { 72 struct vnic_dev *vdev; 73 unsigned int i; 74 75 vdev = wq->vdev; 76 77 vnic_dev_free_desc_ring(vdev, &wq->ring); 78 79 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 80 if (wq->bufs[i]) { 81 kfree(wq->bufs[i]); 82 wq->bufs[i] = NULL; 83 } 84 } 85 86 wq->ctrl = NULL; 87 } 88 89 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 90 unsigned int desc_count, unsigned int desc_size) 91 { 92 int err; 93 94 wq->index = index; 95 wq->vdev = vdev; 96 97 wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index); 98 if (!wq->ctrl) { 99 pr_err("Failed to hook WQ[%d] resource\n", index); 100 return -EINVAL; 101 } 102 103 vnic_wq_disable(wq); 104 105 err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size); 106 if (err) 107 return err; 108 109 err = vnic_wq_alloc_bufs(wq); 110 if (err) { 111 vnic_wq_free(wq); 112 return err; 113 } 114 115 return 0; 116 } 117 118 static void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, 119 unsigned int fetch_index, unsigned int posted_index, 120 unsigned int error_interrupt_enable, 121 unsigned int error_interrupt_offset) 122 { 123 u64 paddr; 124 unsigned int count = wq->ring.desc_count; 125 126 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 127 writeq(paddr, &wq->ctrl->ring_base); 128 iowrite32(count, &wq->ctrl->ring_size); 129 iowrite32(fetch_index, &wq->ctrl->fetch_index); 130 iowrite32(posted_index, &wq->ctrl->posted_index); 131 iowrite32(cq_index, &wq->ctrl->cq_index); 132 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 133 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 134 iowrite32(0, &wq->ctrl->error_status); 135 136 wq->to_use = wq->to_clean = 137 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES(count)] 138 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES(count)]; 139 } 140 141 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 142 unsigned int error_interrupt_enable, 143 unsigned int error_interrupt_offset) 144 { 145 vnic_wq_init_start(wq, cq_index, 0, 0, 146 error_interrupt_enable, 147 error_interrupt_offset); 148 } 149 150 unsigned int vnic_wq_error_status(struct vnic_wq *wq) 151 { 152 return ioread32(&wq->ctrl->error_status); 153 } 154 155 void vnic_wq_enable(struct vnic_wq *wq) 156 { 157 iowrite32(1, &wq->ctrl->enable); 158 } 159 160 int vnic_wq_disable(struct vnic_wq *wq) 161 { 162 unsigned int wait; 163 164 iowrite32(0, &wq->ctrl->enable); 165 166 /* Wait for HW to ACK disable request */ 167 for (wait = 0; wait < 1000; wait++) { 168 if (!(ioread32(&wq->ctrl->running))) 169 return 0; 170 udelay(10); 171 } 172 173 pr_err("Failed to disable WQ[%d]\n", wq->index); 174 175 return -ETIMEDOUT; 176 } 177 178 void vnic_wq_clean(struct vnic_wq *wq, 179 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 180 { 181 struct vnic_wq_buf *buf; 182 183 buf = wq->to_clean; 184 185 while (vnic_wq_desc_used(wq) > 0) { 186 187 (*buf_clean)(wq, buf); 188 189 buf = wq->to_clean = buf->next; 190 wq->ring.desc_avail++; 191 } 192 193 wq->to_use = wq->to_clean = wq->bufs[0]; 194 195 iowrite32(0, &wq->ctrl->fetch_index); 196 iowrite32(0, &wq->ctrl->posted_index); 197 iowrite32(0, &wq->ctrl->error_status); 198 199 vnic_dev_clear_desc_ring(&wq->ring); 200 } 201