[PATCH v5 3/6] dma: swiotlb: Centralize minimal pool sizing

[Catalin Marinas]

On Mon, Sep 21, 2026 at 12:06:25PM +0530, Aneesh Kumar K.V (Arm) wrote:
> A default SWIOTLB pool used only for unaligned kmalloc bouncing can be
> smaller than one required for limited DMA addressing. Arm64 and RISC-V
> currently implement this sizing independently, using 1 MiB of SWIOTLB
> space per GiB of RAM.
> 
> The SWIOTLB core now identifies this case with SWIOTLB_POOL_MINIMAL.
> Size that policy in swiotlb_adjust_pool_size() and remove the
> architecture-specific adjustments.
> 
> Explicit swiotlb= sizing remains unchanged because swiotlb_adjust_size()
> preserves a user-configured size.
> 
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar at kernel.org>

Reviewed-by: Catalin Marinas <catalin.marinas at arm.com>