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