mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-04-03 00:35:30 -04:00
de8955508b
MMIO_REMAP (HDP flush page) is a hardware I/O window exposed via a PCI BAR. It must not migrate or be evicted. Allocate a single 4 KB GEM BO in AMDGPU_GEM_DOMAIN_MMIO_REMAP during TTM initialization when the hardware exposes a remap bus address and the host page size is <= 4 KiB. Reserve the BO and pin it at the TTM level so it remains fixed for its lifetime. No CPU mapping is established here. On teardown, reserve, unpin, and free the BO if present. This prepares the object to be shared (e.g., via dma-buf) without triggering placement changes or no CPU-access migration v2: Added extra NULL checks Suggested-by: Christian König <christian.koenig@amd.com> Suggested-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>