/* SPDX-License-Identifier: GPL-2.0-only */ /* Copyright(c) 2020-2021 Intel Corporation. */ #ifndef __CXL_MEM_H__ #define __CXL_MEM_H__ #include #include #include "cxl.h" /* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */ #define CXLMDEV_STATUS_OFFSET 0x0 #define CXLMDEV_DEV_FATAL BIT(0) #define CXLMDEV_FW_HALT BIT(1) #define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2) #define CXLMDEV_MS_NOT_READY 0 #define CXLMDEV_MS_READY 1 #define CXLMDEV_MS_ERROR 2 #define CXLMDEV_MS_DISABLED 3 #define CXLMDEV_READY(status) \ (FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \ CXLMDEV_MS_READY) #define CXLMDEV_MBOX_IF_READY BIT(4) #define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5) #define CXLMDEV_RESET_NEEDED_NOT 0 #define CXLMDEV_RESET_NEEDED_COLD 1 #define CXLMDEV_RESET_NEEDED_WARM 2 #define CXLMDEV_RESET_NEEDED_HOT 3 #define CXLMDEV_RESET_NEEDED_CXL 4 #define CXLMDEV_RESET_NEEDED(status) \ (FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \ CXLMDEV_RESET_NEEDED_NOT) /** * struct cxl_memdev - CXL bus object representing a Type-3 Memory Device * @dev: driver core device object * @cdev: char dev core object for ioctl operations * @cxlm: pointer to the parent device driver data * @id: id number of this memdev instance. */ struct cxl_memdev { struct device dev; struct cdev cdev; struct cxl_mem *cxlm; int id; }; static inline struct cxl_memdev *to_cxl_memdev(struct device *dev) { return container_of(dev, struct cxl_memdev, dev); } struct cxl_memdev *devm_cxl_add_memdev(struct cxl_mem *cxlm); /** * struct cxl_mbox_cmd - A command to be submitted to hardware. * @opcode: (input) The command set and command submitted to hardware. * @payload_in: (input) Pointer to the input payload. * @payload_out: (output) Pointer to the output payload. Must be allocated by * the caller. * @size_in: (input) Number of bytes to load from @payload_in. * @size_out: (input) Max number of bytes loaded into @payload_out. * (output) Number of bytes generated by the device. For fixed size * outputs commands this is always expected to be deterministic. For * variable sized output commands, it tells the exact number of bytes * written. * @return_code: (output) Error code returned from hardware. * * This is the primary mechanism used to send commands to the hardware. * All the fields except @payload_* correspond exactly to the fields described in * Command Register section of the CXL 2.0 8.2.8.4.5. @payload_in and * @payload_out are written to, and read from the Command Payload Registers * defined in CXL 2.0 8.2.8.4.8. */ struct cxl_mbox_cmd { u16 opcode; void *payload_in; void *payload_out; size_t size_in; size_t size_out; u16 return_code; #define CXL_MBOX_SUCCESS 0 }; /* * CXL 2.0 - Memory capacity multiplier * See Section 8.2.9.5 * * Volatile, Persistent, and Partition capacities are specified to be in * multiples of 256MB - define a multiplier to convert to/from bytes. */ #define CXL_CAPACITY_MULTIPLIER SZ_256M /** * struct cxl_mem - A CXL memory device * @dev: The device associated with this CXL device. * @cxlmd: Logical memory device chardev / interface * @regs: Parsed register blocks * @payload_size: Size of space for payload * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register) * @lsa_size: Size of Label Storage Area * (CXL 2.0 8.2.9.5.1.1 Identify Memory Device) * @mbox_mutex: Mutex to synchronize mailbox access. * @firmware_version: Firmware version for the memory device. * @enabled_cmds: Hardware commands found enabled in CEL. * @pmem_range: Active Persistent memory capacity configuration * @ram_range: Active Volatile memory capacity configuration * @total_bytes: sum of all possible capacities * @volatile_only_bytes: hard volatile capacity * @persistent_only_bytes: hard persistent capacity * @partition_align_bytes: alignment size for partition-able capacity * @active_volatile_bytes: sum of hard + soft volatile * @active_persistent_bytes: sum of hard + soft persistent * @next_volatile_bytes: volatile capacity change pending device reset * @next_persistent_bytes: persistent capacity change pending device reset * @mbox_send: @dev specific transport for transmitting mailbox commands * * See section 8.2.9.5.2 Capacity Configuration and Label Storage for * details on capacity parameters. */ struct cxl_mem { struct device *dev; struct cxl_memdev *cxlmd; struct cxl_regs regs; size_t payload_size; size_t lsa_size; struct mutex mbox_mutex; /* Protects device mailbox and firmware */ char firmware_version[0x10]; DECLARE_BITMAP(enabled_cmds, CXL_MEM_COMMAND_ID_MAX); struct range pmem_range; struct range ram_range; u64 total_bytes; u64 volatile_only_bytes; u64 persistent_only_bytes; u64 partition_align_bytes; u64 active_volatile_bytes; u64 active_persistent_bytes; u64 next_volatile_bytes; u64 next_persistent_bytes; int (*mbox_send)(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd); }; enum cxl_opcode { CXL_MBOX_OP_INVALID = 0x0000, CXL_MBOX_OP_RAW = CXL_MBOX_OP_INVALID, CXL_MBOX_OP_GET_FW_INFO = 0x0200, CXL_MBOX_OP_ACTIVATE_FW = 0x0202, CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400, CXL_MBOX_OP_GET_LOG = 0x0401, CXL_MBOX_OP_IDENTIFY = 0x4000, CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100, CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101, CXL_MBOX_OP_GET_LSA = 0x4102, CXL_MBOX_OP_SET_LSA = 0x4103, CXL_MBOX_OP_GET_HEALTH_INFO = 0x4200, CXL_MBOX_OP_GET_ALERT_CONFIG = 0x4201, CXL_MBOX_OP_SET_ALERT_CONFIG = 0x4202, CXL_MBOX_OP_GET_SHUTDOWN_STATE = 0x4203, CXL_MBOX_OP_SET_SHUTDOWN_STATE = 0x4204, CXL_MBOX_OP_GET_POISON = 0x4300, CXL_MBOX_OP_INJECT_POISON = 0x4301, CXL_MBOX_OP_CLEAR_POISON = 0x4302, CXL_MBOX_OP_GET_SCAN_MEDIA_CAPS = 0x4303, CXL_MBOX_OP_SCAN_MEDIA = 0x4304, CXL_MBOX_OP_GET_SCAN_MEDIA = 0x4305, CXL_MBOX_OP_MAX = 0x10000 }; /** * struct cxl_mem_command - Driver representation of a memory device command * @info: Command information as it exists for the UAPI * @opcode: The actual bits used for the mailbox protocol * @flags: Set of flags effecting driver behavior. * * * %CXL_CMD_FLAG_FORCE_ENABLE: In cases of error, commands with this flag * will be enabled by the driver regardless of what hardware may have * advertised. * * The cxl_mem_command is the driver's internal representation of commands that * are supported by the driver. Some of these commands may not be supported by * the hardware. The driver will use @info to validate the fields passed in by * the user then submit the @opcode to the hardware. * * See struct cxl_command_info. */ struct cxl_mem_command { struct cxl_command_info info; enum cxl_opcode opcode; u32 flags; #define CXL_CMD_FLAG_NONE 0 #define CXL_CMD_FLAG_FORCE_ENABLE BIT(0) }; int cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, u16 opcode, void *in, size_t in_size, void *out, size_t out_size); int cxl_mem_identify(struct cxl_mem *cxlm); int cxl_mem_enumerate_cmds(struct cxl_mem *cxlm); int cxl_mem_create_range_info(struct cxl_mem *cxlm); struct cxl_mem *cxl_mem_create(struct device *dev); #endif /* __CXL_MEM_H__ */