[PATCH 02/11] accel/ivpu: Defer MMU root page table allocation

[Jeffrey Hugo]

On 10/17/2024 8:58 AM, Jacek Lawrynowicz wrote:
> From: Karol Wachowski <karol.wachowski at intel.com>
> 
> Defer root page table allocation and unify context init/fini functions.
> Move allocation of the root page table from the file_priv_open function to
> perform a lazy allocation approach during ivpu_bo_pin().
> 
> By doing so, we avoid the overhead of allocating page tables for simple
> operations like GET_PARAM that do not require them.
> Additionally, the MMU context descriptor table initialization has been
> moved to the ivpu_mmu_context_map_page function.
> 
> This change streamlines the process and ensures that the descriptor table
> is only initialized when it is actually needed.
> Refactor init/fini functions to remove redundant code and make the context
> management more straightforward.
> 
> Overall, these changes lead to a reduction in the time taken by the file
> descriptor open operation, as the costly root page table allocation is now
> avoided for operations that do not require it.
> 
> Signed-off-by: Karol Wachowski <karol.wachowski at intel.com>
> Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz at linux.intel.com>
> Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz at linux.intel.com>

Reviewed-by: Jeffrey Hugo <quic_jhugo at quicinc.com>