Apparatus for a first device MMIO mapped with a second device and a method of performing data processing operations therebetween

A method, comprising:

• sending, by a processor of a first device, a first instruction to a storage controller of the first device, wherein the first instruction comprises a target memory-mapped input/output (MMIO) address, the target MMIO address is comprised in N MMIO addresses of the first device, and N is an integer greater than or equal to 1, wherein storage space of a second device is mapped to MMIO address space of the first device, and the N MMIO addresses in the MMIO address space of the first device are in a one-to-one correspondence with N first storage addresses in the storage space of the second device, and wherein the target MMIO address is a source operand address or a destination operand address in the first instruction;
• receiving, by the storage controller, the first instruction, and determining a first storage address corresponding to the target MMIO address;
• sending a first operation instruction to the second device, wherein the first operation instruction corresponds to the first instruction, and the first operation instruction comprises the first storage address;
• when the target MMIO address is the source operand address, and the first operation instruction is a read operation instruction, performing the following by the storage controller:
• attempting to receive data sent by the second device, wherein the data corresponds to the first storage address and is read by the second device based on the first operation instruction;
• in response to receiving data sent by the second device, writing the data into the destination operand address, and sending a first message to the processor, wherein the destination operand address is comprised in M second storage addresses in storage space of the first device, M is an integer greater than or equal to 1, and the first message indicates that execution of the first instruction succeeds;
• when the data sent by the second device is not received within a preset time range, resending the first operation instruction to the second device at least once within a preset time range;
• and
• when the data sent by the second device is not received after the first operation instruction is resent at least once, sending a second message to the processor, wherein the second message indicates that execution of the first instruction fails;
• and
• wherein a processor core of the processor that sends the first instruction is in a blocked state and cannot execute another task between sending the first instruction and receiving the first message, or between sending the first instruction and receiving the second message.

A non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores a computer program, and when the computer program is executed, a first device is caused to:

• send, by a processor of the first device, a first instruction to a storage controller of the first device, wherein the first instruction comprises a target memory-mapped input/output (MMIO) address, the target MMIO address is comprised in N MMIO addresses of the first device, and N is an integer greater than or equal to 1, wherein storage space of a second device is mapped to MMIO address space of the first device, and the N MMIO addresses in the MMIO address space of the first device are in a one-to-one correspondence with N first storage addresses in the storage space of the second device, and wherein the target MMIO address is a source operand address or a destination operand address in the first instruction;
• receive, by the storage controller, the first instruction, and determine a first storage address corresponding to the target MMIO address;
• send a first operation instruction to the second device, wherein the first operation instruction corresponds to the first instruction, and the first operation instruction comprises the first storage address;
• and
• when the target MMIO address is the source operand address, and the first operation instruction is a read operation instruction, perform the following by the storage controller:
• attempt to receive data sent by the second device, wherein the data corresponds to the first storage address and is read by the second device based on the first operation instruction;
• in response to receiving data sent by the second device, write the data into the destination operand address, and send a first message to the processor, wherein the destination operand address is comprised in M second storage addresses in storage space of the first device, M is an integer greater than or equal to 1, and the first message indicates that execution of the first instruction succeeds;
• when the data sent by the second device is not received within a preset time range, resend the first operation instruction to the second device at least once within a preset time range;
• and
• when the data sent by the second device is not received after the first operation instruction is resent at least once, send a second message to the processor, wherein the second message indicates that execution of the first instruction fails;
• and
• wherein a processor core of the processor that sends the first instruction is in a blocked state and cannot execute another task between sending the first instruction and receiving the first message, or between sending the first instruction and receiving the second message.