LXR linux/drivers/infiniband/hw/efa/efa

   1/* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
   2/*
   3 * Copyright 2018-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
   4 */
   5
   6#ifndef _EFA_COM_H_
   7#define _EFA_COM_H_
   8
   9#include <linux/delay.h>
  10#include <linux/device.h>
  11#include <linux/dma-mapping.h>
  12#include <linux/semaphore.h>
  13#include <linux/sched.h>
  14
  15#include <rdma/ib_verbs.h>
  16
  17#include "efa_common_defs.h"
  18#include "efa_admin_defs.h"
  19#include "efa_admin_cmds_defs.h"
  20#include "efa_regs_defs.h"
  21
  22#define EFA_MAX_HANDLERS 256
  23
  24struct efa_com_admin_cq {
  25        struct efa_admin_acq_entry *entries;
  26        dma_addr_t dma_addr;
  27        spinlock_t lock; /* Protects ACQ */
  28
  29        u16 cc; /* consumer counter */
  30        u8 phase;
  31};
  32
  33struct efa_com_admin_sq {
  34        struct efa_admin_aq_entry *entries;
  35        dma_addr_t dma_addr;
  36        spinlock_t lock; /* Protects ASQ */
  37
  38        u32 __iomem *db_addr;
  39
  40        u16 cc; /* consumer counter */
  41        u16 pc; /* producer counter */
  42        u8 phase;
  43
  44};
  45
  46/* Don't use anything other than atomic64 */
  47struct efa_com_stats_admin {
  48        atomic64_t submitted_cmd;
  49        atomic64_t completed_cmd;
  50        atomic64_t cmd_err;
  51        atomic64_t no_completion;
  52};
  53
  54enum {
  55        EFA_AQ_STATE_RUNNING_BIT = 0,
  56        EFA_AQ_STATE_POLLING_BIT = 1,
  57};
  58
  59struct efa_com_admin_queue {
  60        void *dmadev;
  61        void *efa_dev;
  62        struct efa_comp_ctx *comp_ctx;
  63        u32 completion_timeout; /* usecs */
  64        u16 poll_interval; /* msecs */
  65        u16 depth;
  66        struct efa_com_admin_cq cq;
  67        struct efa_com_admin_sq sq;
  68        u16 msix_vector_idx;
  69
  70        unsigned long state;
  71
  72        /* Count the number of available admin commands */
  73        struct semaphore avail_cmds;
  74
  75        struct efa_com_stats_admin stats;
  76
  77        spinlock_t comp_ctx_lock; /* Protects completion context pool */
  78        u32 *comp_ctx_pool;
  79        u16 comp_ctx_pool_next;
  80};
  81
  82struct efa_aenq_handlers;
  83
  84struct efa_com_aenq {
  85        struct efa_admin_aenq_entry *entries;
  86        struct efa_aenq_handlers *aenq_handlers;
  87        dma_addr_t dma_addr;
  88        u32 cc; /* consumer counter */
  89        u16 msix_vector_idx;
  90        u16 depth;
  91        u8 phase;
  92};
  93
  94struct efa_com_mmio_read {
  95        struct efa_admin_mmio_req_read_less_resp *read_resp;
  96        dma_addr_t read_resp_dma_addr;
  97        u16 seq_num;
  98        u16 mmio_read_timeout; /* usecs */
  99        /* serializes mmio reads */
 100        spinlock_t lock;
 101};
 102
 103struct efa_com_dev {
 104        struct efa_com_admin_queue aq;
 105        struct efa_com_aenq aenq;
 106        u8 __iomem *reg_bar;
 107        void *dmadev;
 108        void *efa_dev;
 109        u32 supported_features;
 110        u32 dma_addr_bits;
 111
 112        struct efa_com_mmio_read mmio_read;
 113};
 114
 115typedef void (*efa_aenq_handler)(void *data,
 116              struct efa_admin_aenq_entry *aenq_e);
 117
 118/* Holds aenq handlers. Indexed by AENQ event group */
 119struct efa_aenq_handlers {
 120        efa_aenq_handler handlers[EFA_MAX_HANDLERS];
 121        efa_aenq_handler unimplemented_handler;
 122};
 123
 124int efa_com_admin_init(struct efa_com_dev *edev,
 125                       struct efa_aenq_handlers *aenq_handlers);
 126void efa_com_admin_destroy(struct efa_com_dev *edev);
 127int efa_com_dev_reset(struct efa_com_dev *edev,
 128                      enum efa_regs_reset_reason_types reset_reason);
 129void efa_com_set_admin_polling_mode(struct efa_com_dev *edev, bool polling);
 130void efa_com_admin_q_comp_intr_handler(struct efa_com_dev *edev);
 131int efa_com_mmio_reg_read_init(struct efa_com_dev *edev);
 132void efa_com_mmio_reg_read_destroy(struct efa_com_dev *edev);
 133
 134int efa_com_validate_version(struct efa_com_dev *edev);
 135int efa_com_get_dma_width(struct efa_com_dev *edev);
 136
 137int efa_com_cmd_exec(struct efa_com_admin_queue *aq,
 138                     struct efa_admin_aq_entry *cmd,
 139                     size_t cmd_size,
 140                     struct efa_admin_acq_entry *comp,
 141                     size_t comp_size);
 142void efa_com_aenq_intr_handler(struct efa_com_dev *edev, void *data);
 143
 144#endif /* _EFA_COM_H_ */
 145