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