drivers/scsi/snic/vnic_cq.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright 2014 Cisco Systems, Inc.  All rights reserved. */
   3
   4 #ifndef _VNIC_CQ_H_
   5 #define _VNIC_CQ_H_
   6
   7 #include "cq_desc.h"
   8 #include "vnic_dev.h"
   9
  10 /* Completion queue control */
  11 struct vnic_cq_ctrl {
  12         u64 ring_base;                  /* 0x00 */
  13         u32 ring_size;                  /* 0x08 */
  14         u32 pad0;
  15         u32 flow_control_enable;        /* 0x10 */
  16         u32 pad1;
  17         u32 color_enable;               /* 0x18 */
  18         u32 pad2;
  19         u32 cq_head;                    /* 0x20 */
  20         u32 pad3;
  21         u32 cq_tail;                    /* 0x28 */
  22         u32 pad4;
  23         u32 cq_tail_color;              /* 0x30 */
  24         u32 pad5;
  25         u32 interrupt_enable;           /* 0x38 */
  26         u32 pad6;
  27         u32 cq_entry_enable;            /* 0x40 */
  28         u32 pad7;
  29         u32 cq_message_enable;          /* 0x48 */
  30         u32 pad8;
  31         u32 interrupt_offset;           /* 0x50 */
  32         u32 pad9;
  33         u64 cq_message_addr;            /* 0x58 */
  34         u32 pad10;
  35 };
  36
  37 struct vnic_cq {
  38         unsigned int index;
  39         struct vnic_dev *vdev;
  40         struct vnic_cq_ctrl __iomem *ctrl;      /* memory-mapped */
  41         struct vnic_dev_ring ring;
  42         unsigned int to_clean;
  43         unsigned int last_color;
  44 };
  45
  46 static inline unsigned int svnic_cq_service(struct vnic_cq *cq,
  47         unsigned int work_to_do,
  48         int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
  49         u8 type, u16 q_number, u16 completed_index, void *opaque),
  50         void *opaque)
  51 {
  52         struct cq_desc *cq_desc;
  53         unsigned int work_done = 0;
  54         u16 q_number, completed_index;
  55         u8 type, color;
  56
  57         cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  58                 cq->ring.desc_size * cq->to_clean);
  59         cq_desc_dec(cq_desc, &type, &color,
  60                 &q_number, &completed_index);
  61
  62         while (color != cq->last_color) {
  63
  64                 if ((*q_service)(cq->vdev, cq_desc, type,
  65                         q_number, completed_index, opaque))
  66                         break;
  67
  68                 cq->to_clean++;
  69                 if (cq->to_clean == cq->ring.desc_count) {
  70                         cq->to_clean = 0;
  71                         cq->last_color = cq->last_color ? 0 : 1;
  72                 }
  73
  74                 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  75                         cq->ring.desc_size * cq->to_clean);
  76                 cq_desc_dec(cq_desc, &type, &color,
  77                         &q_number, &completed_index);
  78
  79                 work_done++;
  80                 if (work_done >= work_to_do)
  81                         break;
  82         }
  83
  84         return work_done;
  85 }
  86
  87 void svnic_cq_free(struct vnic_cq *cq);
  88 int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq,
  89         unsigned int index, unsigned int desc_count, unsigned int desc_size);
  90 void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
  91         unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
  92         unsigned int cq_tail_color, unsigned int interrupt_enable,
  93         unsigned int cq_entry_enable, unsigned int message_enable,
  94         unsigned int interrupt_offset, u64 message_addr);
  95 void svnic_cq_clean(struct vnic_cq *cq);
  96 #endif /* _VNIC_CQ_H_ */