Re: [PATCH] iommu/rockchip: Fix PAGE_DESC_HI_MASKs for RK3568

From: Heiko Stübner
Date: Wed Nov 24 2021 - 05:35:54 EST


Am Mittwoch, 24. November 2021, 03:13:25 CET schrieb Alex Bee:
> With the submission of iommu driver for RK3568 a subtle bug was
> introduced: PAGE_DESC_HI_MASK1 and PAGE_DESC_HI_MASK2 have to be
> the other way arround - that leads to random errors, especially when
> addresses beyond 32 bit are used.
>
> Fix it.
>
> Fixes: c55356c534aa ("iommu: rockchip: Add support for iommu v2")
> Signed-off-by: Alex Bee <knaerzche@xxxxxxxxx>
> ---
>
> I've found this bug, when testing the recent VOP2 submission, which is
> the first perpherial which uses iommu for RK356x. I could use it on my
> quartz64 8GB board only, when limiting the available memory to less 4GB.
>
> This patch fixes it.
>
> drivers/iommu/rockchip-iommu.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index 5cb260820eda..7f23ad61c094 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -200,8 +200,8 @@ static inline phys_addr_t rk_dte_pt_address(u32 dte)
> #define DTE_HI_MASK2 GENMASK(7, 4)
> #define DTE_HI_SHIFT1 24 /* shift bit 8 to bit 32 */
> #define DTE_HI_SHIFT2 32 /* shift bit 4 to bit 36 */
> -#define PAGE_DESC_HI_MASK1 GENMASK_ULL(39, 36)
> -#define PAGE_DESC_HI_MASK2 GENMASK_ULL(35, 32)
> +#define PAGE_DESC_HI_MASK1 GENMASK_ULL(35, 32)
> +#define PAGE_DESC_HI_MASK2 GENMASK_ULL(39, 36)

With this change the PAGE_DESC_HI_MASK* now match the other
constants above them in what bits they access, so

Reviewed-by: Heiko Stuebner <heiko@xxxxxxxxx>