drivers/scsi/fnic/vnic_wq.c

   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 }