Method and system for structured programmed input/output transactions

A computer-readable medium comprising:

• employing a processor executing computer-executable instructions stored on the computer-readable storage medium to implement the following acts:
• dispatching a programmed input/output (PIO) work request for a PIO transaction from a device manager;
• constructing a PIO transaction object representing the PIO work request by referencing a PIO enabler object, the enabler object is constructed prior to the construction of the PIO transaction object, wherein the enabler object captures general PIO operational parameters and manages underlying operating system objects;
• initializing data particular to the work request in the PIO transaction object;
• and
• processing the PIO transaction to completion in conjunction with transitioning the PIO transaction object through processing states,
• wherein the transitioning comprises calling an application program interface (API) of the PIO transaction object, the API of the PIO transaction object being selected from a set including:
• PIO Transaction Execute, PIO Transaction Completed, PIO Transaction Get Bytes Transferred, or PIO Transaction Release.

A system for structuring at least a first programmed input/output (PIO) transaction in a computing environment, the system comprising:

• a memory;
• and
• a processor, operatively coupled to the memory, the processor executing computer-executable instructions to effect the following:
• an operating system configured for sending an input/output request for the first PIO transaction to a device manager;
• and
• a device manager configured for:
• receiving the input/output request,
• constructing a first PIO transaction object, the construction of the first PIO transaction object includes referencing a PIO enabler object, wherein the PIO enabler captures PIO operational parameters specific to the device manager and is constructed before the construction of the first PIO transaction object,
• initializing data in the first PIO transaction object, the data initialized on the first PIO transaction object is particular to the input/output request, and
• processing the first PIO transaction to completion in conjunction with transitioning the first PIO transaction object through processing states the first PIO transaction object,
• wherein the transitioning comprises calling a programming interface of the first PIO transaction, the programming interface selected from a set including:
• PIO Transaction Execute, PIO Transaction Completed, PIO Transaction Get Bytes Transferred, or PIO Transaction Release.

In a computing environment, a method for preparing the computing environment for structuring a programmed input/output (PIO) transaction, the method comprising:

• employing a processor executing the computer-executable instructions retained in memory to effect the following:
• receiving a request from a device for a programmed input/output (PIO) transaction;
• constructing a PIO enabler object that captures general PIO operational parameters and manages underlying operating system objects;
• initializing data in the PIO enabler object, the data initialized on the PIO enabler object includes default operational information of the device from which the PIO transaction request was received;
• and
• referencing the PIO enabler object to construct a PIO transaction object based in part on the initialized data of the PIO enabler object.

A method for preparing a computing environment for structuring a programmed input/output (PIO) transaction comprising:

• employing a processor executing the computer-executable instructions stored on the computer-readable storage medium to implement the following acts:
• constructing a PIO enabler object in response to a request for an input/output transaction from a device manager, wherein the PIO enabler object captures general PIO operational parameters and manages underlying operating system objects;
• initializing data in the PIO enabler object from a profile that includes default information specific to the device manager that requested the input/output transaction the default information comprises at least one of alignment requirements of the device, a maximum length parameter for the transaction or maximum scatter and gather elements;
• and
• referencing the PIO enabler object to construct a PIO transaction object, wherein the construction of the PIO transaction object further includes parameters particular to the request for the input/output transaction.