1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2 /*
3  * Copyright (c) 2024-2025 Intel Corporation
4  *
5  * These are definitions for the mailbox command interface of CXL subsystem.
6  */
7 #ifndef _UAPI_FWCTL_CXL_H_
8 #define _UAPI_FWCTL_CXL_H_
9 
10 #include <linux/types.h>
11 #include <linux/stddef.h>
12 #include <cxl/features.h>
13 
14 /**
15  * struct fwctl_rpc_cxl - ioctl(FWCTL_RPC) input for CXL
16  * @opcode: CXL mailbox command opcode
17  * @flags: Flags for the command (input).
18  * @op_size: Size of input payload.
19  * @reserved1: Reserved. Must be 0s.
20  * @get_sup_feats_in: Get Supported Features input
21  * @get_feat_in: Get Feature input
22  * @set_feat_in: Set Feature input
23  */
24 struct fwctl_rpc_cxl {
25 	__struct_group(fwctl_rpc_cxl_hdr, hdr, /* no attrs */,
26 		__u32 opcode;
27 		__u32 flags;
28 		__u32 op_size;
29 		__u32 reserved1;
30 	);
31 	union {
32 		struct cxl_mbox_get_sup_feats_in get_sup_feats_in;
33 		struct cxl_mbox_get_feat_in get_feat_in;
34 		struct cxl_mbox_set_feat_in set_feat_in;
35 	};
36 };
37 
38 /**
39  * struct fwctl_rpc_cxl_out - ioctl(FWCTL_RPC) output for CXL
40  * @size: Size of the output payload
41  * @retval: Return value from device
42  * @get_sup_feats_out: Get Supported Features output
43  * @payload: raw byte stream of payload
44  */
45 struct fwctl_rpc_cxl_out {
46 	__struct_group(fwctl_rpc_cxl_out_hdr, hdr, /* no attrs */,
47 		__u32 size;
48 		__u32 retval;
49 	);
50 	union {
51 		struct cxl_mbox_get_sup_feats_out get_sup_feats_out;
52 		__DECLARE_FLEX_ARRAY(__u8, payload);
53 	};
54 };
55 
56 #endif
57