linux-kernel - Re: [PATCH] iommu/rockchip: Fix PAGE_DESC_HI

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Date:   Wed, 24 Nov 2021 11:35:43 +0100
From:   Heiko Stübner <heiko@...ech.de>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Alex Bee <knaerzche@...il.com>
Cc:     Benjamin Gaignard <benjamin.gaignard@...labora.com>,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alex Bee <knaerzche@...il.com>
Subject: Re: [PATCH] iommu/rockchip: Fix PAGE_DESC_HI_MASKs for RK3568

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@...il.com>
> ---
> 
> 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@...ech.de>