drivers/cdx/controller/mcdi.h

   1 /* SPDX-License-Identifier: GPL-2.0
   2  *
   3  * Copyright 2008-2013 Solarflare Communications Inc.
   4  * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
   5  */
   6
   7 #ifndef CDX_MCDI_H
   8 #define CDX_MCDI_H
   9
  10 #include <linux/mutex.h>
  11 #include <linux/kref.h>
  12 #include <linux/rpmsg.h>
  13
  14 #include "bitfield.h"
  15 #include "mc_cdx_pcol.h"
  16
  17 #ifdef DEBUG
  18 #define CDX_WARN_ON_ONCE_PARANOID(x) WARN_ON_ONCE(x)
  19 #define CDX_WARN_ON_PARANOID(x) WARN_ON(x)
  20 #else
  21 #define CDX_WARN_ON_ONCE_PARANOID(x) do {} while (0)
  22 #define CDX_WARN_ON_PARANOID(x) do {} while (0)
  23 #endif
  24
  25 /**
  26  * enum cdx_mcdi_mode - MCDI transaction mode
  27  * @MCDI_MODE_EVENTS: wait for an mcdi response callback.
  28  * @MCDI_MODE_FAIL: we think MCDI is dead, so fail-fast all calls
  29  */
  30 enum cdx_mcdi_mode {
  31         MCDI_MODE_EVENTS,
  32         MCDI_MODE_FAIL,
  33 };
  34
  35 #define MCDI_RPC_TIMEOUT        (10 * HZ)
  36 #define MCDI_RPC_LONG_TIMEOU    (60 * HZ)
  37 #define MCDI_RPC_POST_RST_TIME  (10 * HZ)
  38
  39 #define MCDI_BUF_LEN (8 + MCDI_CTL_SDU_LEN_MAX)
  40
  41 /**
  42  * enum cdx_mcdi_cmd_state - State for an individual MCDI command
  43  * @MCDI_STATE_QUEUED: Command not started and is waiting to run.
  44  * @MCDI_STATE_RETRY: Command was submitted and MC rejected with no resources,
  45  *      as MC have too many outstanding commands. Command will be retried once
  46  *      another command returns.
  47  * @MCDI_STATE_RUNNING: Command was accepted and is running.
  48  * @MCDI_STATE_RUNNING_CANCELLED: Command is running but the issuer cancelled
  49  *      the command.
  50  * @MCDI_STATE_FINISHED: Processing of this command has completed.
  51  */
  52
  53 enum cdx_mcdi_cmd_state {
  54         MCDI_STATE_QUEUED,
  55         MCDI_STATE_RETRY,
  56         MCDI_STATE_RUNNING,
  57         MCDI_STATE_RUNNING_CANCELLED,
  58         MCDI_STATE_FINISHED,
  59 };
  60
  61 /**
  62  * struct cdx_mcdi - CDX MCDI Firmware interface, to interact
  63  *      with CDX controller.
  64  * @mcdi: MCDI interface
  65  * @mcdi_ops: MCDI operations
  66  * @r5_rproc : R5 Remoteproc device handle
  67  * @rpdev: RPMsg device
  68  * @ept: RPMsg endpoint
  69  * @work: Post probe work
  70  */
  71 struct cdx_mcdi {
  72         /* MCDI interface */
  73         struct cdx_mcdi_data *mcdi;
  74         const struct cdx_mcdi_ops *mcdi_ops;
  75
  76         struct rproc *r5_rproc;
  77         struct rpmsg_device *rpdev;
  78         struct rpmsg_endpoint *ept;
  79         struct work_struct work;
  80 };
  81
  82 struct cdx_mcdi_ops {
  83         void (*mcdi_request)(struct cdx_mcdi *cdx,
  84                              const struct cdx_dword *hdr, size_t hdr_len,
  85                              const struct cdx_dword *sdu, size_t sdu_len);
  86         unsigned int (*mcdi_rpc_timeout)(struct cdx_mcdi *cdx, unsigned int cmd);
  87 };
  88
  89 typedef void cdx_mcdi_async_completer(struct cdx_mcdi *cdx,
  90                                       unsigned long cookie, int rc,
  91                                       struct cdx_dword *outbuf,
  92                                       size_t outlen_actual);
  93
  94 /**
  95  * struct cdx_mcdi_cmd - An outstanding MCDI command
  96  * @ref: Reference count. There will be one reference if the command is
  97  *      in the mcdi_iface cmd_list, another if it's on a cleanup list,
  98  *      and a third if it's queued in the work queue.
  99  * @list: The data for this entry in mcdi->cmd_list
 100  * @cleanup_list: The data for this entry in a cleanup list
 101  * @work: The work item for this command, queued in mcdi->workqueue
 102  * @mcdi: The mcdi_iface for this command
 103  * @state: The state of this command
 104  * @inlen: inbuf length
 105  * @inbuf: Input buffer
 106  * @quiet: Whether to silence errors
 107  * @reboot_seen: Whether a reboot has been seen during this command,
 108  *      to prevent duplicates
 109  * @seq: Sequence number
 110  * @started: Jiffies this command was started at
 111  * @cookie: Context for completion function
 112  * @completer: Completion function
 113  * @handle: Command handle
 114  * @cmd: Command number
 115  * @rc: Return code
 116  * @outlen: Length of output buffer
 117  * @outbuf: Output buffer
 118  */
 119 struct cdx_mcdi_cmd {
 120         struct kref ref;
 121         struct list_head list;
 122         struct list_head cleanup_list;
 123         struct work_struct work;
 124         struct cdx_mcdi_iface *mcdi;
 125         enum cdx_mcdi_cmd_state state;
 126         size_t inlen;
 127         const struct cdx_dword *inbuf;
 128         bool quiet;
 129         bool reboot_seen;
 130         u8 seq;
 131         unsigned long started;
 132         unsigned long cookie;
 133         cdx_mcdi_async_completer *completer;
 134         unsigned int handle;
 135         unsigned int cmd;
 136         int rc;
 137         size_t outlen;
 138         struct cdx_dword *outbuf;
 139         /* followed by inbuf data if necessary */
 140 };
 141
 142 /**
 143  * struct cdx_mcdi_iface - MCDI protocol context
 144  * @cdx: The associated NIC
 145  * @iface_lock: Serialise access to this structure
 146  * @outstanding_cleanups: Count of cleanups
 147  * @cmd_list: List of outstanding and running commands
 148  * @workqueue: Workqueue used for delayed processing
 149  * @cmd_complete_wq: Waitqueue for command completion
 150  * @db_held_by: Command the MC doorbell is in use by
 151  * @seq_held_by: Command each sequence number is in use by
 152  * @prev_handle: The last used command handle
 153  * @mode: Poll for mcdi completion, or wait for an mcdi_event
 154  * @prev_seq: The last used sequence number
 155  * @new_epoch: Indicates start of day or start of MC reboot recovery
 156  */
 157 struct cdx_mcdi_iface {
 158         struct cdx_mcdi *cdx;
 159         /* Serialise access */
 160         struct mutex iface_lock;
 161         unsigned int outstanding_cleanups;
 162         struct list_head cmd_list;
 163         struct workqueue_struct *workqueue;
 164         wait_queue_head_t cmd_complete_wq;
 165         struct cdx_mcdi_cmd *db_held_by;
 166         struct cdx_mcdi_cmd *seq_held_by[16];
 167         unsigned int prev_handle;
 168         enum cdx_mcdi_mode mode;
 169         u8 prev_seq;
 170         bool new_epoch;
 171 };
 172
 173 /**
 174  * struct cdx_mcdi_data - extra state for NICs that implement MCDI
 175  * @iface: Interface/protocol state
 176  * @fn_flags: Flags for this function, as returned by %MC_CMD_DRV_ATTACH.
 177  */
 178 struct cdx_mcdi_data {
 179         struct cdx_mcdi_iface iface;
 180         u32 fn_flags;
 181 };
 182
 183 static inline struct cdx_mcdi_iface *cdx_mcdi_if(struct cdx_mcdi *cdx)
 184 {
 185         return cdx->mcdi ? &cdx->mcdi->iface : NULL;
 186 }
 187
 188 int cdx_mcdi_init(struct cdx_mcdi *cdx);
 189 void cdx_mcdi_finish(struct cdx_mcdi *cdx);
 190
 191 void cdx_mcdi_process_cmd(struct cdx_mcdi *cdx, struct cdx_dword *outbuf, int len);
 192 int cdx_mcdi_rpc(struct cdx_mcdi *cdx, unsigned int cmd,
 193                  const struct cdx_dword *inbuf, size_t inlen,
 194                  struct cdx_dword *outbuf, size_t outlen, size_t *outlen_actual);
 195 int cdx_mcdi_rpc_async(struct cdx_mcdi *cdx, unsigned int cmd,
 196                        const struct cdx_dword *inbuf, size_t inlen,
 197                        cdx_mcdi_async_completer *complete,
 198                        unsigned long cookie);
 199 int cdx_mcdi_wait_for_quiescence(struct cdx_mcdi *cdx,
 200                                  unsigned int timeout_jiffies);
 201
 202 /*
 203  * We expect that 16- and 32-bit fields in MCDI requests and responses
 204  * are appropriately aligned, but 64-bit fields are only
 205  * 32-bit-aligned.
 206  */
 207 #define MCDI_DECLARE_BUF(_name, _len) struct cdx_dword _name[DIV_ROUND_UP(_len, 4)] = {{0}}
 208 #define _MCDI_PTR(_buf, _offset)                                        \
 209         ((u8 *)(_buf) + (_offset))
 210 #define MCDI_PTR(_buf, _field)                                          \
 211         _MCDI_PTR(_buf, MC_CMD_ ## _field ## _OFST)
 212 #define _MCDI_CHECK_ALIGN(_ofst, _align)                                \
 213         ((void)BUILD_BUG_ON_ZERO((_ofst) & ((_align) - 1)),             \
 214          (_ofst))
 215 #define _MCDI_DWORD(_buf, _field)                                       \
 216         ((_buf) + (_MCDI_CHECK_ALIGN(MC_CMD_ ## _field ## _OFST, 4) >> 2))
 217
 218 #define MCDI_BYTE(_buf, _field)                                         \
 219         ((void)BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 1),       \
 220          *MCDI_PTR(_buf, _field))
 221 #define MCDI_WORD(_buf, _field)                                         \
 222         ((void)BUILD_BUG_ON_ZERO(MC_CMD_ ## _field ## _LEN != 2),       \
 223          le16_to_cpu(*(__force const __le16 *)MCDI_PTR(_buf, _field)))
 224 #define MCDI_SET_DWORD(_buf, _field, _value)                            \
 225         CDX_POPULATE_DWORD_1(*_MCDI_DWORD(_buf, _field), CDX_DWORD, _value)
 226 #define MCDI_DWORD(_buf, _field)                                        \
 227         CDX_DWORD_FIELD(*_MCDI_DWORD(_buf, _field), CDX_DWORD)
 228 #define MCDI_POPULATE_DWORD_1(_buf, _field, _name1, _value1)            \
 229         CDX_POPULATE_DWORD_1(*_MCDI_DWORD(_buf, _field),                \
 230                              MC_CMD_ ## _name1, _value1)
 231 #define MCDI_SET_QWORD(_buf, _field, _value)                            \
 232         do {                                                            \
 233                 CDX_POPULATE_DWORD_1(_MCDI_DWORD(_buf, _field)[0],      \
 234                                      CDX_DWORD, (u32)(_value)); \
 235                 CDX_POPULATE_DWORD_1(_MCDI_DWORD(_buf, _field)[1],      \
 236                                      CDX_DWORD, (u64)(_value) >> 32);   \
 237         } while (0)
 238 #define MCDI_QWORD(_buf, _field)                                        \
 239         (CDX_DWORD_FIELD(_MCDI_DWORD(_buf, _field)[0], CDX_DWORD) |     \
 240         (u64)CDX_DWORD_FIELD(_MCDI_DWORD(_buf, _field)[1], CDX_DWORD) << 32)
 241
 242 #endif /* CDX_MCDI_H */