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
  28 int vnic_wq_get_ctrl(struct vnic_dev *vdev, struct vnic_wq *wq,
  29                 unsigned int index, enum vnic_res_type res_type)
  30 {
  31         wq->ctrl = vnic_dev_get_res(vdev, res_type, index);
  32
  33         if (!wq->ctrl)
  34                 return -EINVAL;
  35
  36         return 0;
  37 }
  38
  39
  40 int vnic_wq_alloc_ring(struct vnic_dev *vdev, struct vnic_wq *wq,
  41                 unsigned int desc_count, unsigned int desc_size)
  42 {
  43         return vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
  44 }
  45
  46
  47 static int vnic_wq_alloc_bufs(struct vnic_wq *wq)
  48 {
  49         struct vnic_wq_buf *buf;
  50         unsigned int i, j, count = wq->ring.desc_count;
  51         unsigned int blks = VNIC_WQ_BUF_BLKS_NEEDED(count);
  52
  53         for (i = 0; i < blks; i++) {
  54                 wq->bufs[i] = kzalloc(VNIC_WQ_BUF_BLK_SZ, GFP_ATOMIC);
  55                 if (!wq->bufs[i]) {
  56                         printk(KERN_ERR "Failed to alloc wq_bufs\n");
  57                         return -ENOMEM;
  58                 }
  59         }
  60
  61         for (i = 0; i < blks; i++) {
  62                 buf = wq->bufs[i];
  63                 for (j = 0; j < VNIC_WQ_BUF_BLK_ENTRIES; j++) {
  64                         buf->index = i * VNIC_WQ_BUF_BLK_ENTRIES + j;
  65                         buf->desc = (u8 *)wq->ring.descs +
  66                                 wq->ring.desc_size * buf->index;
  67                         if (buf->index + 1 == count) {
  68                                 buf->next = wq->bufs[0];
  69                                 break;
  70                         } else if (j + 1 == VNIC_WQ_BUF_BLK_ENTRIES) {
  71                                 buf->next = wq->bufs[i + 1];
  72                         } else {
  73                                 buf->next = buf + 1;
  74                                 buf++;
  75                         }
  76                 }
  77         }
  78
  79         wq->to_use = wq->to_clean = wq->bufs[0];
  80
  81         return 0;
  82 }
  83
  84 void vnic_wq_free(struct vnic_wq *wq)
  85 {
  86         struct vnic_dev *vdev;
  87         unsigned int i;
  88
  89         vdev = wq->vdev;
  90
  91         vnic_dev_free_desc_ring(vdev, &wq->ring);
  92
  93         for (i = 0; i < VNIC_WQ_BUF_BLKS_MAX; i++) {
  94                 kfree(wq->bufs[i]);
  95                 wq->bufs[i] = NULL;
  96         }
  97
  98         wq->ctrl = NULL;
  99
 100 }
 101
 102 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
 103         unsigned int desc_count, unsigned int desc_size)
 104 {
 105         int err;
 106
 107         wq->index = index;
 108         wq->vdev = vdev;
 109
 110         wq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_WQ, index);
 111         if (!wq->ctrl) {
 112                 printk(KERN_ERR "Failed to hook WQ[%d] resource\n", index);
 113                 return -EINVAL;
 114         }
 115
 116         vnic_wq_disable(wq);
 117
 118         err = vnic_dev_alloc_desc_ring(vdev, &wq->ring, desc_count, desc_size);
 119         if (err)
 120                 return err;
 121
 122         err = vnic_wq_alloc_bufs(wq);
 123         if (err) {
 124                 vnic_wq_free(wq);
 125                 return err;
 126         }
 127
 128         return 0;
 129 }
 130
 131
 132 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
 133                 unsigned int desc_count, unsigned int desc_size)
 134 {
 135         int err;
 136
 137         wq->index = 0;
 138         wq->vdev = vdev;
 139
 140         err = vnic_wq_get_ctrl(vdev, wq, 0, RES_TYPE_DEVCMD2);
 141         if (err) {
 142                 pr_err("Failed to get devcmd2 resource\n");
 143                 return err;
 144         }
 145         vnic_wq_disable(wq);
 146
 147         err = vnic_wq_alloc_ring(vdev, wq, desc_count, desc_size);
 148         if (err)
 149                 return err;
 150         return 0;
 151 }
 152
 153 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 154                 unsigned int fetch_index, unsigned int posted_index,
 155                 unsigned int error_interrupt_enable,
 156                 unsigned int error_interrupt_offset)
 157 {
 158         u64 paddr;
 159         unsigned int count = wq->ring.desc_count;
 160
 161         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 162         writeq(paddr, &wq->ctrl->ring_base);
 163         iowrite32(count, &wq->ctrl->ring_size);
 164         iowrite32(fetch_index, &wq->ctrl->fetch_index);
 165         iowrite32(posted_index, &wq->ctrl->posted_index);
 166         iowrite32(cq_index, &wq->ctrl->cq_index);
 167         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 168         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 169         iowrite32(0, &wq->ctrl->error_status);
 170
 171         wq->to_use = wq->to_clean =
 172                 &wq->bufs[fetch_index / VNIC_WQ_BUF_BLK_ENTRIES]
 173                 [fetch_index % VNIC_WQ_BUF_BLK_ENTRIES];
 174 }
 175
 176
 177 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 178         unsigned int error_interrupt_enable,
 179         unsigned int error_interrupt_offset)
 180 {
 181         u64 paddr;
 182
 183         paddr = (u64)wq->ring.base_addr | VNIC_PADDR_TARGET;
 184         writeq(paddr, &wq->ctrl->ring_base);
 185         iowrite32(wq->ring.desc_count, &wq->ctrl->ring_size);
 186         iowrite32(0, &wq->ctrl->fetch_index);
 187         iowrite32(0, &wq->ctrl->posted_index);
 188         iowrite32(cq_index, &wq->ctrl->cq_index);
 189         iowrite32(error_interrupt_enable, &wq->ctrl->error_interrupt_enable);
 190         iowrite32(error_interrupt_offset, &wq->ctrl->error_interrupt_offset);
 191         iowrite32(0, &wq->ctrl->error_status);
 192 }
 193
 194 unsigned int vnic_wq_error_status(struct vnic_wq *wq)
 195 {
 196         return ioread32(&wq->ctrl->error_status);
 197 }
 198
 199 void vnic_wq_enable(struct vnic_wq *wq)
 200 {
 201         iowrite32(1, &wq->ctrl->enable);
 202 }
 203
 204 int vnic_wq_disable(struct vnic_wq *wq)
 205 {
 206         unsigned int wait;
 207
 208         iowrite32(0, &wq->ctrl->enable);
 209
 210         /* Wait for HW to ACK disable request */
 211         for (wait = 0; wait < 100; wait++) {
 212                 if (!(ioread32(&wq->ctrl->running)))
 213                         return 0;
 214                 udelay(1);
 215         }
 216
 217         printk(KERN_ERR "Failed to disable WQ[%d]\n", wq->index);
 218
 219         return -ETIMEDOUT;
 220 }
 221
 222 void vnic_wq_clean(struct vnic_wq *wq,
 223         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf))
 224 {
 225         struct vnic_wq_buf *buf;
 226
 227         BUG_ON(ioread32(&wq->ctrl->enable));
 228
 229         buf = wq->to_clean;
 230
 231         while (vnic_wq_desc_used(wq) > 0) {
 232
 233                 (*buf_clean)(wq, buf);
 234
 235                 buf = wq->to_clean = buf->next;
 236                 wq->ring.desc_avail++;
 237         }
 238
 239         wq->to_use = wq->to_clean = wq->bufs[0];
 240
 241         iowrite32(0, &wq->ctrl->fetch_index);
 242         iowrite32(0, &wq->ctrl->posted_index);
 243         iowrite32(0, &wq->ctrl->error_status);
 244
 245         vnic_dev_clear_desc_ring(&wq->ring);
 246 }