drivers/infiniband/hw/efa/efa_com.h

   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
  24 struct 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
  33 struct 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 */
  47 struct 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
  54 enum {
  55         EFA_AQ_STATE_RUNNING_BIT = 0,
  56         EFA_AQ_STATE_POLLING_BIT = 1,
  57 };
  58
  59 struct 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
  82 struct efa_aenq_handlers;
  83
  84 struct 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
  94 struct 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
 103 struct 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
 115 typedef void (*efa_aenq_handler)(void *data,
 116               struct efa_admin_aenq_entry *aenq_e);
 117
 118 /* Holds aenq handlers. Indexed by AENQ event group */
 119 struct efa_aenq_handlers {
 120         efa_aenq_handler handlers[EFA_MAX_HANDLERS];
 121         efa_aenq_handler unimplemented_handler;
 122 };
 123
 124 int efa_com_admin_init(struct efa_com_dev *edev,
 125                        struct efa_aenq_handlers *aenq_handlers);
 126 void efa_com_admin_destroy(struct efa_com_dev *edev);
 127 int efa_com_dev_reset(struct efa_com_dev *edev,
 128                       enum efa_regs_reset_reason_types reset_reason);
 129 void efa_com_set_admin_polling_mode(struct efa_com_dev *edev, bool polling);
 130 void efa_com_admin_q_comp_intr_handler(struct efa_com_dev *edev);
 131 int efa_com_mmio_reg_read_init(struct efa_com_dev *edev);
 132 void efa_com_mmio_reg_read_destroy(struct efa_com_dev *edev);
 133
 134 int efa_com_validate_version(struct efa_com_dev *edev);
 135 int efa_com_get_dma_width(struct efa_com_dev *edev);
 136
 137 int 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);
 142 void efa_com_aenq_intr_handler(struct efa_com_dev *edev, void *data);
 143
 144 #endif /* _EFA_COM_H_ */