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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* CXL IOCTLs for Memory Devices
*/
#ifndef _UAPI_CXL_MEM_H_
#define _UAPI_CXL_MEM_H_
#include <linux/types.h>
/**
* DOC: UAPI
*
* Not all of all commands that the driver supports are always available for use
* by userspace. Userspace must check the results from the QUERY command in
* order to determine the live set of commands.
*/
#define CXL_MEM_QUERY_COMMANDS _IOR(0xCE, 1, struct cxl_mem_query_commands)
#define CXL_MEM_SEND_COMMAND _IOWR(0xCE, 2, struct cxl_send_command)
#define CXL_CMDS \
___C(INVALID, "Invalid Command"), \
___C(IDENTIFY, "Identify Command"), \
___C(RAW, "Raw device command"), \
___C(GET_SUPPORTED_LOGS, "Get Supported Logs"), \
___C(MAX, "invalid / last command")
#define ___C(a, b) CXL_MEM_COMMAND_ID_##a
enum { CXL_CMDS };
#undef ___C
#define ___C(a, b) { b }
static const struct {
const char *name;
} cxl_command_names[] = { CXL_CMDS };
/*
* Here's how this actually breaks out:
* cxl_command_names[] = {
* [CXL_MEM_COMMAND_ID_INVALID] = { "Invalid Command" },
* [CXL_MEM_COMMAND_ID_IDENTIFY] = { "Identify Command" },
* ...
* [CXL_MEM_COMMAND_ID_MAX] = { "invalid / last command" },
* };
*/
#undef ___C
/**
* struct cxl_command_info - Command information returned from a query.
* @id: ID number for the command.
* @flags: Flags that specify command behavior.
* @size_in: Expected input size, or -1 if variable length.
* @size_out: Expected output size, or -1 if variable length.
*
* Represents a single command that is supported by both the driver and the
* hardware. This is returned as part of an array from the query ioctl. The
* following would be a command that takes a variable length input and returns 0
* bytes of output.
*
* - @id = 10
* - @flags = 0
* - @size_in = -1
* - @size_out = 0
*
* See struct cxl_mem_query_commands.
*/
struct cxl_command_info {
__u32 id;
__u32 flags;
#define CXL_MEM_COMMAND_FLAG_MASK GENMASK(0, 0)
__s32 size_in;
__s32 size_out;
};
/**
* struct cxl_mem_query_commands - Query supported commands.
* @n_commands: In/out parameter. When @n_commands is > 0, the driver will
* return min(num_support_commands, n_commands). When @n_commands
* is 0, driver will return the number of total supported commands.
* @rsvd: Reserved for future use.
* @commands: Output array of supported commands. This array must be allocated
* by userspace to be at least min(num_support_commands, @n_commands)
*
* Allow userspace to query the available commands supported by both the driver,
* and the hardware. Commands that aren't supported by either the driver, or the
* hardware are not returned in the query.
*
* Examples:
*
* - { .n_commands = 0 } // Get number of supported commands
* - { .n_commands = 15, .commands = buf } // Return first 15 (or less)
* supported commands
*
* See struct cxl_command_info.
*/
struct cxl_mem_query_commands {
/*
* Input: Number of commands to return (space allocated by user)
* Output: Number of commands supported by the driver/hardware
*
* If n_commands is 0, kernel will only return number of commands and
* not try to populate commands[], thus allowing userspace to know how
* much space to allocate
*/
__u32 n_commands;
__u32 rsvd;
struct cxl_command_info __user commands[]; /* out: supported commands */
};
/**
* struct cxl_send_command - Send a command to a memory device.
* @id: The command to send to the memory device. This must be one of the
* commands returned by the query command.
* @flags: Flags for the command (input).
* @raw: Special fields for raw commands
* @raw.opcode: Opcode passed to hardware when using the RAW command.
* @raw.rsvd: Must be zero.
* @rsvd: Must be zero.
* @retval: Return value from the memory device (output).
* @in: Parameters associated with input payload.
* @in.size: Size of the payload to provide to the device (input).
* @in.rsvd: Must be zero.
* @in.payload: Pointer to memory for payload input, payload is little endian.
* @out: Parameters associated with output payload.
* @out.size: Size of the payload received from the device (input/output). This
* field is filled in by userspace to let the driver know how much
* space was allocated for output. It is populated by the driver to
* let userspace know how large the output payload actually was.
* @out.rsvd: Must be zero.
* @out.payload: Pointer to memory for payload output, payload is little endian.
*
* Mechanism for userspace to send a command to the hardware for processing. The
* driver will do basic validation on the command sizes. In some cases even the
* payload may be introspected. Userspace is required to allocate large enough
* buffers for size_out which can be variable length in certain situations.
*/
struct cxl_send_command {
__u32 id;
__u32 flags;
union {
struct {
__u16 opcode;
__u16 rsvd;
} raw;
__u32 rsvd;
};
__u32 retval;
struct {
__s32 size;
__u32 rsvd;
__u64 payload;
} in;
struct {
__s32 size;
__u32 rsvd;
__u64 payload;
} out;
};
#endif
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