drivers/infiniband/hw/efa/efa_com.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause */
   2 /*
   3  * Copyright 2018-2019 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 no_completion;
  51 };
  52
  53 enum {
  54         EFA_AQ_STATE_RUNNING_BIT = 0,
  55         EFA_AQ_STATE_POLLING_BIT = 1,
  56 };
  57
  58 struct efa_com_admin_queue {
  59         void *dmadev;
  60         void *efa_dev;
  61         struct efa_comp_ctx *comp_ctx;
  62         u32 completion_timeout; /* usecs */
  63         u16 poll_interval; /* msecs */
  64         u16 depth;
  65         struct efa_com_admin_cq cq;
  66         struct efa_com_admin_sq sq;
  67         u16 msix_vector_idx;
  68
  69         unsigned long state;
  70
  71         /* Count the number of available admin commands */
  72         struct semaphore avail_cmds;
  73
  74         struct efa_com_stats_admin stats;
  75
  76         spinlock_t comp_ctx_lock; /* Protects completion context pool */
  77         u32 *comp_ctx_pool;
  78         u16 comp_ctx_pool_next;
  79 };
  80
  81 struct efa_aenq_handlers;
  82
  83 struct efa_com_aenq {
  84         struct efa_admin_aenq_entry *entries;
  85         struct efa_aenq_handlers *aenq_handlers;
  86         dma_addr_t dma_addr;
  87         u32 cc; /* consumer counter */
  88         u16 msix_vector_idx;
  89         u16 depth;
  90         u8 phase;
  91 };
  92
  93 struct efa_com_mmio_read {
  94         struct efa_admin_mmio_req_read_less_resp *read_resp;
  95         dma_addr_t read_resp_dma_addr;
  96         u16 seq_num;
  97         u16 mmio_read_timeout; /* usecs */
  98         /* serializes mmio reads */
  99         spinlock_t lock;
 100 };
 101
 102 struct efa_com_dev {
 103         struct efa_com_admin_queue aq;
 104         struct efa_com_aenq aenq;
 105         u8 __iomem *reg_bar;
 106         void *dmadev;
 107         void *efa_dev;
 108         u32 supported_features;
 109         u32 dma_addr_bits;
 110
 111         struct efa_com_mmio_read mmio_read;
 112 };
 113
 114 typedef void (*efa_aenq_handler)(void *data,
 115               struct efa_admin_aenq_entry *aenq_e);
 116
 117 /* Holds aenq handlers. Indexed by AENQ event group */
 118 struct efa_aenq_handlers {
 119         efa_aenq_handler handlers[EFA_MAX_HANDLERS];
 120         efa_aenq_handler unimplemented_handler;
 121 };
 122
 123 int efa_com_admin_init(struct efa_com_dev *edev,
 124                        struct efa_aenq_handlers *aenq_handlers);
 125 void efa_com_admin_destroy(struct efa_com_dev *edev);
 126 int efa_com_dev_reset(struct efa_com_dev *edev,
 127                       enum efa_regs_reset_reason_types reset_reason);
 128 void efa_com_set_admin_polling_mode(struct efa_com_dev *edev, bool polling);
 129 void efa_com_admin_q_comp_intr_handler(struct efa_com_dev *edev);
 130 int efa_com_mmio_reg_read_init(struct efa_com_dev *edev);
 131 void efa_com_mmio_reg_read_destroy(struct efa_com_dev *edev);
 132
 133 int efa_com_validate_version(struct efa_com_dev *edev);
 134 int efa_com_get_dma_width(struct efa_com_dev *edev);
 135
 136 int efa_com_cmd_exec(struct efa_com_admin_queue *aq,
 137                      struct efa_admin_aq_entry *cmd,
 138                      size_t cmd_size,
 139                      struct efa_admin_acq_entry *comp,
 140                      size_t comp_size);
 141 void efa_com_aenq_intr_handler(struct efa_com_dev *edev, void *data);
 142
 143 #endif /* _EFA_COM_H_ */