Efficient line and page organization for compression status bit caching

A processing subsystem, comprising:

• a frame buffer that includes a plural memory devices organized as partitions, wherein each partition has a corresponding partition count;
• and
• a processing unit coupled to the frame buffer and including:
• a processing cluster configured to generate a virtual address corresponding to a unit of data residing in the frame buffer, and
• a memory interface coupled to the processing cluster and to the frame buffer and configured to:
• select a page table entry (PTE) based on the virtual address, the PTE comprising a physical address for the unit of data within the frame buffer and a compression cache tag line,
• compute a compression cache tag based on the compression cache tag line and the partition count for the frame buffer,
• query a compression cache to determine whether the compression cache tag represents a cache hit, and
• if the compression cache tag represents a cache hit, then access one or more compression bits from a cache line, wherein the one or more compression bits represent a compression status for the unit of data to be used when accessing the unit of data from the frame buffer, or
• if the compression cache tag represents a cache miss, then retrieve one or more compression bits to an identified cache line for storage.

A computer system, comprising:

• a system memory;
• and
• a processing subsystem, comprising:
• a frame buffer that includes a plural memory devices organized as partitions, wherein each partition has a corresponding partition count, and
• a processing unit coupled to the frame buffer and including:
• a processing cluster configured to generate a virtual address corresponding to a unit of data residing in the frame buffer, and
• a memory interface coupled to the processing cluster and to the frame buffer and configured to:
• select a page table entry (PTE) based on the virtual address, the PTE comprising a physical address for the unit of data within the frame buffer and a compression cache tag line,
• compute a compression cache tag based on the compression cache tag line and the partition count for the frame buffer,
• query a compression cache to determine whether the compression cache tag represents a cache hit, and
• if the compression cache tag represents a cache hit, then access one or more compression bits from a cache line, wherein the one or more compression bits represent a compression status for the unit of data to be used when accessing the unit of data from the frame buffer, or
• if the compression cache tag represents a cache miss, then retrieve one or more compression bits to an identified cache line for storage.