linux-kernel - Re: [PATCH v2 1/2] drm/amd/display: fix the white screen issue when >= 64GB DRAM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CADnq5_MZt-sFrJSy9UKo-DL18LCEuBcf1-jnd1MocqHCh_QS5g@mail.gmail.com>
Date:   Fri, 8 Sep 2023 11:06:52 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Hamza Mahfooz <hamza.mahfooz@....com>
Cc:     amd-gfx@...ts.freedesktop.org, Alan Liu <haoping.liu@....com>,
        Lijo Lazar <lijo.lazar@....com>,
        dri-devel@...ts.freedesktop.org,
        Mario Limonciello <mario.limonciello@....com>,
        David Airlie <airlied@...il.com>,
        Shashank Sharma <shashank.sharma@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Aurabindo Pillai <aurabindo.pillai@....com>,
        Qingqing Zhuo <Qingqing.Zhuo@....com>,
        Harry Wentland <harry.wentland@....com>,
        Stylon Wang <stylon.wang@....com>,
        Victor Zhao <Victor.Zhao@....com>,
        Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
        Leo Li <sunpeng.li@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Le Ma <le.ma@....com>, Hersen Wu <hersenxs.wu@....com>,
        Yifan Zhang <yifan1.zhang@....com>,
        Felix Kuehling <felix.kuehling@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Hawking Zhang <Hawking.Zhang@....com>,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <wayne.lin@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Candice Li <candice.li@....com>, Lang Yu <Lang.Yu@....com>,
        Christian König <christian.koenig@....com>,
        Luben Tuikov <luben.tuikov@....com>
Subject: Re: [PATCH v2 1/2] drm/amd/display: fix the white screen issue when
 >= 64GB DRAM

Series is:
Reviewed-by: Alex Deucher <alexander.deucher@....com>

On Fri, Sep 8, 2023 at 10:56 AM Hamza Mahfooz <hamza.mahfooz@....com> wrote:
>
> From: Yifan Zhang <yifan1.zhang@....com>
>
> Dropping bit 31:4 of page table base is wrong, it makes page table
> base points to wrong address if phys addr is beyond 64GB; dropping
> page_table_start/end bit 31:4 is unnecessary since dcn20_vmid_setup
> will do that. Also, while we are at it, cleanup the assignments using
> upper_32_bits()/lower_32_bits() and AMDGPU_GPU_PAGE_SHIFT.
>
> Cc: stable@...r.kernel.org
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2354
> Fixes: 81d0bcf99009 ("drm/amdgpu: make display pinning more flexible (v2)")
> Signed-off-by: Yifan Zhang <yifan1.zhang@....com>
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
> ---
> v2: use upper_32_bits()/lower_32_bits() and AMDGPU_GPU_PAGE_SHIFT
> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 1bb1a394f55f..5f14cd9391ca 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1283,11 +1283,15 @@ static void mmhub_read_system_context(struct amdgpu_device *adev, struct dc_phy_
>
>         pt_base = amdgpu_gmc_pd_addr(adev->gart.bo);
>
> -       page_table_start.high_part = (u32)(adev->gmc.gart_start >> 44) & 0xF;
> -       page_table_start.low_part = (u32)(adev->gmc.gart_start >> 12);
> -       page_table_end.high_part = (u32)(adev->gmc.gart_end >> 44) & 0xF;
> -       page_table_end.low_part = (u32)(adev->gmc.gart_end >> 12);
> -       page_table_base.high_part = upper_32_bits(pt_base) & 0xF;
> +       page_table_start.high_part = upper_32_bits(adev->gmc.gart_start >>
> +                                                  AMDGPU_GPU_PAGE_SHIFT);
> +       page_table_start.low_part = lower_32_bits(adev->gmc.gart_start >>
> +                                                 AMDGPU_GPU_PAGE_SHIFT);
> +       page_table_end.high_part = upper_32_bits(adev->gmc.gart_end >>
> +                                                AMDGPU_GPU_PAGE_SHIFT);
> +       page_table_end.low_part = lower_32_bits(adev->gmc.gart_end >>
> +                                               AMDGPU_GPU_PAGE_SHIFT);
> +       page_table_base.high_part = upper_32_bits(pt_base);
>         page_table_base.low_part = lower_32_bits(pt_base);
>
>         pa_config->system_aperture.start_addr = (uint64_t)logical_addr_low << 18;
> --
> 2.41.0
>