Method for PCI IO using PCI device memory mapping in a logically partitioned system

A method for conducting PCI IO operations using PCI device memory mapping in a logically partitioned system, comprising:

• initializing the PCI IO devices, wherein initializing comprises:
• constructing a pseudonym address to PCI device mapping table using a bus walk process;
• reading a Bar address space with a mapping function;
• selecting at least one pseudonym PCI IO address for the BAR address space;
• associating the BAR address space with the PCI device;
• and
• updating a PCI device structure IO resource with the at least one pseudonym PCI IO address;
• and
• executing a PCI IO memory operation, wherein executing comprises:
• retrieving a PCI address from the PCI device structure IO resource with a device driver;
• issuing at least one of a read and a write operation with a macro based operation;
• mapping the at least one pseudonym PCI IO address to the PCI device;
• performing a PCI IO memory operation with the hypervisor;
• and
• returning results of the memory operation to the device driver.

A computer readable medium storing a software program that, when executed by a processor, causes the processor to perform a method for PCI IO using PCI device memory mapping in a logically partitioned system comprising:

• detecting PCI devices in a bus walk initialization process;
• associating a pseudonym address range with each PCI device detected in the bus walk initialization process;
• updating PCI device IO resources for each PCI device detected with the associated pseudonym address range;
• and
• accessing the detected PCI devices with a device driver using the pseudonym address range stored in the PCI device IO resources.

A computer readable medium storing a software program that, when executed by a processor, causes the processor to perform a method for conducting PCI IO operations using PCI device memory mapping in a logically partitioned system, comprising:

• initializing the PCI IO devices, wherein initializing comprises:
• constructing a pseudonym address to PCI device mapping table using a bus walk process;
• reading a BAR address space with a mapping function;
• selecting at least one pseudonym PCI IO address for the BAR address space;
• associating the BAR address space with the PCI device;
• and
• updating a PCI device structure IO resource with the at least one pseudonym PCI IO address;
• and
• executing a PCI IO memory operation, wherein executing comprises:
• retrieving a PCI address from the PCI device structure IO resource with a device driver;
• issuing at least one of a read and a write operation with a macro based operation;
• mapping the at least one pseudonym PCI IO address to the PCI device;
• performing a PCI IO memory operation with the hypervisor;
• and
• returning results of the memory operation to the device driver.