On Wed, Sep 30, 2020 at 03:06:41PM +0800, Yong Wu wrote:

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 <yong.wu@mediatek.com>
---
 drivers/iommu/mtk_iommu.c  | 12 +++++++++---
 drivers/memory/mtk-smi.c   |  7 +++++++
 include/soc/mediatek/smi.h |  1 +
 3 files changed, 17 insertions(+), 3 deletions(-)

For the memory part:
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>

Best regards,
Krzysztof

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel