linux-kernel - Re: [PATCH v5 0/6] drm/panfrost: Add support for AARCH64

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Message-ID: <867cca4f-7180-42e6-bb2a-9f73ad09e5e4@arm.com>
Date: Mon, 31 Mar 2025 12:15:59 +0100
From: Steven Price <steven.price@....com>
To: Ariel D'Alessandro <ariel.dalessandro@...labora.com>,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: boris.brezillon@...labora.com, robh@...nel.org,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, kernel@...labora.com,
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 sjoerd@...labora.com, angelogioacchino.delregno@...labora.com
Subject: Re: [PATCH v5 0/6] drm/panfrost: Add support for AARCH64_4K page
 table format

On 24/03/2025 18:57, Ariel D'Alessandro wrote:
> Hi all,
> 
> This is a new iteration on Panfrost support for AARCH64_4K page table
> format. The main reason behind this patchset is that MediaTek MT8188 SoC
> (ARM Mali-G57 MC3 GPU) constantly faults due to the actual Panfrost cache
> configuration.
> 
> Currently, Panfrost only supports MMU configuration in "LEGACY" (as Bifrost
> calls it) mode, a (modified) version of LPAE "Large Physical Address
> Extension", which in Linux we've called "mali_lpae".
> 
> This patchset adds support for conditionally enabling AARCH64_4K page table
> format. To achieve that, a "GPU optional quirks" field was added to
> `struct panfrost_features` with the related flag.
> 
> Note that, in order to enable AARCH64_4K mode, the GPU variant must have
> the HW_FEATURE_AARCH64_MMU feature flag present.
> 
> The patchset only enables the new format on Mediatek MT8188 and MT8192,
> which have been tested on a Mediatek Genio 700 EVK (MT8390) and Mediatek
> Genio 1200 EVK (MT8395) boards respectively.
> 
> Thanks!
> 
> Changes in v5:
> * Fixed drm_WARN() in panfrost_mmu_cfg_init().
> 
> Changes in v4:
> * Fixed panfrost_mmu_cfg_init() return value on warning.
> 
> Changes in v3:
> * Fixed error handling in panfrost_mmu_ctx_create().
> 
> Changes in v2:
> * Dropped panfrost_mmu_enable/disable unification.
> * Rename gpu_configs as gpu_quirks.
> * Added error handling on page table not properly aligned.
> * Enabled AARCH64_4K format on MediaTek MT8192 as well.
> * Minor fixes.
> 
> Changes in v1:
> * Added "Set IOMMU_CACHE flag" patch.
> * Replaced `panfrost_mmu->enable()` function pointer by `cfg` struct
> prepared during init time.
> * Made mali_lpae/aarch64_4k name more clear.
> * Added GPU_CONFIG_AARCH64_4K flag to enable AARCH64_4K page table
>   format.
> * Enabled AARCH64_4K mode only on mediatek-mt8188.
> 
> Ariel D'Alessandro (6):
>   drm/panfrost: Set IOMMU_CACHE flag
>   drm/panfrost: Use GPU_MMU_FEATURES_VA_BITS/PA_BITS macros
>   drm/panfrost: Set HW_FEATURE_AARCH64_MMU feature flag on Bifrost
>     models
>   drm/panfrost: Add support for AARCH64_4K page table format
>   drm/panfrost: Force AARCH64_4K page table format on MediaTek MT8188
>   drm/panfrost: Force AARCH64_4K page table format on MediaTek MT8192
> 
>  drivers/gpu/drm/panfrost/panfrost_device.h   |  16 ++
>  drivers/gpu/drm/panfrost/panfrost_drv.c      |   2 +
>  drivers/gpu/drm/panfrost/panfrost_features.h |   3 +
>  drivers/gpu/drm/panfrost/panfrost_mmu.c      | 150 +++++++++++++++++--
>  drivers/gpu/drm/panfrost/panfrost_regs.h     |  36 +++++
>  5 files changed, 196 insertions(+), 11 deletions(-)
> 

This looks in good shape now, so unless anyone shouts I'll merge this to
drm-misc-next later today.

Thanks,
Steve