| 8d2c749e | 11-Jan-2021 |
Yong Wu <[email protected]> |
iommu/mediatek: Support master use iova over 32bit
After extending v7s, our pagetable already support iova reach 16GB(34bit). the master got the iova via dma_alloc_attrs may reach 34bits, but its HW
iommu/mediatek: Support master use iova over 32bit
After extending v7s, our pagetable already support iova reach 16GB(34bit). the master got the iova via dma_alloc_attrs may reach 34bits, but its HW register still is 32bit. then how to set the bit32/bit33 iova? this depend on a SMI larb setting(bank_sel).
we separate whole 16GB iova to four banks: bank: 0: 0~4G; 1: 4~8G; 2: 8-12G; 3: 12-16G; The bank number is (iova >> 32).
We will preassign which bank the larbs belong to. currently we don't have a interface for master to adjust its bank number.
Each a bank is a iova_region which is a independent iommu-domain. the iova range for each iommu-domain can't cross 4G.
Signed-off-by: Yong Wu <[email protected]> Acked-by: Krzysztof Kozlowski <[email protected]> #for memory part Reviewed-by: Tomasz Figa <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Will Deacon <[email protected]>
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