On 1/9/2023 5:23 AM, Jacek Lawrynowicz wrote:
VPU Memory Management Unit is based on ARM MMU-600. It allows the creation of multiple virtual address spaces for the device and map noncontinuous host memory (there is no dedicated memory on the VPU). Address space is implemented as a struct ivpu_mmu_context, it has an ID, drm_mm allocator for VPU addresses and struct ivpu_mmu_pgtable that holds actual 3-level, 4KB page table. Context with ID 0 (global context) is created upon driver initialization and it's mainly used for mapping memory required to execute the firmware. Contexts with non-zero IDs are user contexts allocated each time the devices is open()-ed and they map command buffers and other workload-related memory. Workloads executing in a given contexts have access only to the memory mapped in this context. This patch is has two main files: - ivpu_mmu_context.c handles MMU page tables and memory mapping - ivpu_mmu.c implements a driver that programs the MMU device Co-developed-by: Karol Wachowski <karol.wachowski@xxxxxxxxxxxxxxx> Signed-off-by: Karol Wachowski <karol.wachowski@xxxxxxxxxxxxxxx> Co-developed-by: Krystian Pradzynski <krystian.pradzynski@xxxxxxxxxxxxxxx> Signed-off-by: Krystian Pradzynski <krystian.pradzynski@xxxxxxxxxxxxxxx> Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@xxxxxxxxxxxxxxx>
Reviewed-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
