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cxl_mem.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* * CXL IOCTLs for Memory Devices */ #ifndef _CXL_MEM_H_ #define _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 _IOR(0xCE, 1, struct cxl_mem_query_commands) #define CXL_MEM_SEND_COMMAND _IOWR(0xCE, 2, struct cxl_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 \ ___C(INVALID, "Invalid Command"), \ ___C(IDENTIFY, "Identify Command"), \ ___C(RAW, "Raw device command"), \ ___C(GET_SUPPORTED_LOGS, "Get Supported Logs"), \ ___C(GET_FW_INFO, "Get FW Info"), \ ___C(GET_PARTITION_INFO, "Get Partition Information"), \ ___C(GET_LSA, "Get Label Storage Area"), \ ___C(GET_HEALTH_INFO, "Get Health Info"), \ ___C(GET_LOG, "Get Log"), \ ___C(SET_PARTITION_INFO, "Set Partition Information"), \ ___C(SET_LSA, "Set Label Storage Area"), \ ___C(GET_ALERT_CONFIG, "Get Alert Configuration"), \ ___C(SET_ALERT_CONFIG, "Set Alert Configuration"), \ ___C(GET_SHUTDOWN_STATE, "Get Shutdown State"), \ ___C(SET_SHUTDOWN_STATE, "Set Shutdown State"), \ ___DEPRECATED(GET_POISON, "Get Poison List"), \ ___DEPRECATED(INJECT_POISON, "Inject Poison"), \ ___DEPRECATED(CLEAR_POISON, "Clear Poison"), \ ___C(GET_SCAN_MEDIA_CAPS, "Get Scan Media Capabilities"), \ ___DEPRECATED(SCAN_MEDIA, "Scan Media"), \ ___DEPRECATED(GET_SCAN_MEDIA, "Get Scan Media Results"), \ ___C(GET_TIMESTAMP, "Get Timestamp"), \ ___C(MAX, "invalid / last command") #define ___C(a, b) CXL_MEM_COMMAND_ID_##a #define ___DEPRECATED(a, b) CXL_MEM_DEPRECATED_ID_##a enum { CXL_CMDS }; #undef ___C #undef ___DEPRECATED #define ___C(a, b) { b } #define ___DEPRECATED(a, b) { "Deprecated " b } static const struct { const char *name; } cxl_command_names[] __attribute__((__unused__)) = { 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 #undef ___DEPRECATED #define ___C(a, b) (0) #define ___DEPRECATED(a, b) (1) static const __u8 cxl_deprecated_commands[] __attribute__((__unused__)) = { CXL_CMDS }; /* * 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 { __u32 id; __u32 flags; #define CXL_MEM_COMMAND_FLAG_MASK GENMASK(1, 0) #define CXL_MEM_COMMAND_FLAG_ENABLED BIT(0) #define CXL_MEM_COMMAND_FLAG_EXCLUSIVE BIT(1) __u32 size_in; __u32 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 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 { __u32 size; __u32 rsvd; __u64 payload; } in; struct { __u32 size; __u32 rsvd; __u64 payload; } out; }; #endif