diff options
Diffstat (limited to 'drivers/cxl/cxlmem.h')
| -rw-r--r-- | drivers/cxl/cxlmem.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index e14bcd7a1ba1..c142532db8cb 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -67,6 +67,45 @@ devm_cxl_add_memdev(struct cxl_mem *cxlm, const struct cdevm_file_operations *cdevm_fops); /** + * 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 @@ -88,6 +127,7 @@ devm_cxl_add_memdev(struct cxl_mem *cxlm, * @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. @@ -115,5 +155,7 @@ struct cxl_mem { u64 active_persistent_bytes; u64 next_volatile_bytes; u64 next_persistent_bytes; + + int (*mbox_send)(struct cxl_mem *cxlm, struct cxl_mbox_cmd *cmd); }; #endif /* __CXL_MEM_H__ */ |