/* 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 the commands that the driver supports are available for use by * userspace at all times. Userspace can check the result of the QUERY command * to determine the live set of commands. Alternatively, it can issue the * command and check for failure. */ #define CXL_MEM_QUERY_COMMANDS … #define CXL_MEM_SEND_COMMAND … /* * NOTE: New defines must be added to the end of the list to preserve * compatibility because this enum is exported to user space. */ #define CXL_CMDS … #define ___C … #define ___DEPRECATED … enum { … }; #undef ___C #undef ___DEPRECATED #define ___C … #define ___DEPRECATED … static const struct { … } cxl_command_names[] __attribute__((__unused__)) = …; /* * 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 #undef ___DEPRECATED #define ___C … #define ___DEPRECATED … static const __u8 cxl_deprecated_commands[] __attribute__((__unused__)) = …; /* * Here's how this actually breaks out: * cxl_deprecated_commands[] = { * [CXL_MEM_COMMAND_ID_INVALID] = 0, * [CXL_MEM_COMMAND_ID_IDENTIFY] = 0, * ... * [CXL_MEM_DEPRECATED_ID_GET_POISON] = 1, * [CXL_MEM_DEPRECATED_ID_INJECT_POISON] = 1, * [CXL_MEM_DEPRECATED_ID_CLEAR_POISON] = 1, * ... * }; */ #undef ___C #undef ___DEPRECATED /** * struct cxl_command_info - Command information returned from a query. * @id: ID number for the command. * @flags: Flags that specify command behavior. * * CXL_MEM_COMMAND_FLAG_USER_ENABLED * * The given command id is supported by the driver and is supported by * a related opcode on the device. * * CXL_MEM_COMMAND_FLAG_EXCLUSIVE * * Requests with the given command id will terminate with EBUSY as the * kernel actively owns management of the given resource. For example, * the label-storage-area can not be written while the kernel is * actively managing that space. * * @size_in: Expected input size, or ~0 if variable length. * @size_out: Expected output size, or ~0 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 = CXL_MEM_COMMAND_FLAG_ENABLED * - @size_in = ~0 * - @size_out = 0 * * See struct cxl_mem_query_commands. */ struct cxl_command_info { … }; /** * 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 { … }; /** * 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 { … }; #endif
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