Change Details

The pmap_change_attr() API is private on arm64, but there are other functions that can be used instead. The pmap_page_set_memattr() returns NULL pages for paddr in the resource range, so the function pmap_ketner() is used, which makes it possible to set memattr for the given memory range. Submitted by: Michal Krawczyk <mk@semihalf.com> Obtained from: Semihalf Sponsored by: Amazon, Inc.

As the pmamp_change_attr() is public on arm64 since D20787, it can be used on the arm64 to map memory range as with the write combined attribute. It requires the driver to use generic VM_MEMATTR_WRITE_COMBINING flag instead of the x86 specific PAT_WRITE_COMBINING. Submitted by: Michal Krawczyk <mk@semihalf.com> Obtained from: Semihalf Sponsored by: Amazon, Inc.

TAs the pmamp_change_attr() API is privateublic on arm64 since D20787, but there are otherit can be functions that can be used instead. The pmap_page_set_memattr() returnsused on the arm64 to map memory range as with the write combined NULL pages for paddr inattribute. It requires the resource range, so the functiondriver to use generic VM_MEMATTR_WRITE_COMBINING flag pmap_ketner() is used, which makes it possible to set memattr for the given memory rangeinstead of the x86 specific PAT_WRITE_COMBINING. Submitted by: Michal Krawczyk <mk@semihalf.com> Obtained from: Semihalf Sponsored by: Amazon, Inc.