include/cxl/mailbox.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* Copyright(c) 2024 Intel Corporation. */
   3 #ifndef __CXL_MBOX_H__
   4 #define __CXL_MBOX_H__
   5 #include <linux/rcuwait.h>
   6
   7 struct cxl_mbox_cmd;
   8
   9 /**
  10  * struct cxl_mailbox - context for CXL mailbox operations
  11  * @host: device that hosts the mailbox
  12  * @payload_size: Size of space for payload
  13  *                (CXL 3.1 8.2.8.4.3 Mailbox Capabilities Register)
  14  * @mbox_mutex: mutex protects device mailbox and firmware
  15  * @mbox_wait: rcuwait for mailbox
  16  * @mbox_send: @dev specific transport for transmitting mailbox commands
  17  */
  18 struct cxl_mailbox {
  19         struct device *host;
  20         size_t payload_size;
  21         struct mutex mbox_mutex; /* lock to protect mailbox context */
  22         struct rcuwait mbox_wait;
  23         int (*mbox_send)(struct cxl_mailbox *cxl_mbox, struct cxl_mbox_cmd *cmd);
  24 };
  25
  26 int cxl_mailbox_init(struct cxl_mailbox *cxl_mbox, struct device *host);
  27
  28 #endif