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