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 "vnic_dev.h" 24 #include "vnic_wq.h" 25 26 static int vnic_wq_alloc_bufs(struct vnic_wq *wq) 27 { 28 struct vnic_wq_buf *buf; 29 struct vnic_dev *vdev; 30 unsigned int i, j, count = wq->ring.desc_count; 31 unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count); 32 33 vdev = wq->vdev; 34 35 for (i = 0; i < blks; i++) { 36 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC); 37 if (!wq->bufs[i]) { 38 printk(KERN_ERR "Failed to alloc wq_bufs\n"); 39 return -ENOMEM; 40 } 41 } 42 43 for (i = 0; i < blks; i++) { 44 buf = wq->bufs[i]; 45 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) { 46 buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j; 47 buf->desc = (u8 *)wq->ring.descs + 48 wq->ring.desc_size * buf->index; 49 if (buf->index + 1 == count) { 50 buf->next = wq->bufs[0]; 51 break; 52 } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) { 53 buf->next = wq->bufs[i + 1]; 54 } else { 55 buf->next = buf + 1; 56 buf++; 57 } 58 } 59 } 60 61 wq->to_use = wq->to_clean = wq->bufs[0]; 62 63 return 0; 64 } 65 66 void vnic_wq_free(struct vnic_wq *wq) 67 { 68 struct vnic_dev *vdev; 69 unsigned int i; 70 71 vdev = wq->vdev; 72 73 vnic_dev_free_desc_ring(vdev, &wq->ring); 74 75 for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) { 76 kfree(wq->bufs[i]); 77 wq->bufs[i] = NULL; 78 } 79 80 wq->ctrl = NULL; 81 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 printk(KERN_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 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 114 unsigned int error_interrupt_enable, 115 unsigned int error_interrupt_offset) 116 { 117 u64 paddr; 118 119 paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET; 120 writeq(paddr, &wq->ctrl->ring_base); 121 iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size); 122 iowrite32(0, &wq->ctrl->fetch_index); 123 iowrite32(0, &wq->ctrl->posted_index); 124 iowrite32(cq_index, &wq->ctrl->cq_index); 125 iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable); 126 iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset); 127 iowrite32(0, &wq->ctrl->error_status); 128 } 129 130 unsigned int vnic_wq_error_status(struct vnic_wq *wq) 131 { 132 return ioread32(&wq->ctrl->error_status); 133 } 134 135 void vnic_wq_enable(struct vnic_wq *wq) 136 { 137 iowrite32(1, &wq->ctrl->enable); 138 } 139 140 int vnic_wq_disable(struct vnic_wq *wq) 141 { 142 unsigned int wait; 143 144 iowrite32(0, &wq->ctrl->enable); 145 146 /* Wait for HW to ACK disable request */ 147 for (wait = 0; wait < 100; wait++) { 148 if (!(ioread32(&wq->ctrl->running))) 149 return 0; 150 udelay(1); 151 } 152 153 printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index); 154 155 return -ETIMEDOUT; 156 } 157 158 void vnic_wq_clean(struct vnic_wq *wq, 159 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)) 160 { 161 struct vnic_wq_buf *buf; 162 163 BUG_ON(ioread32(&wq->ctrl->enable)); 164 165 buf = wq->to_clean; 166 167 while (vnic_wq_desc_used(wq) > 0) { 168 169 (*buf_clean)(wq, buf); 170 171 buf = wq->to_clean = buf->next; 172 wq->ring.desc_avail++; 173 } 174 175 wq->to_use = wq->to_clean = wq->bufs[0]; 176 177 iowrite32(0, &wq->ctrl->fetch_index); 178 iowrite32(0, &wq->ctrl->posted_index); 179 iowrite32(0, &wq->ctrl->error_status); 180 181 vnic_dev_clear_desc_ring(&wq->ring); 182 } 183