linux-kernel - Re: [PATCH v3 4/6] drm/panfrost: Add support for AARCH64

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Message-ID: <992360e3-632c-4a0e-bb84-a72be7d7cd37@collabora.com>
Date: Mon, 17 Mar 2025 11:30:59 -0300
From: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 robh@...nel.org, steven.price@....com, 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 v3 4/6] drm/panfrost: Add support for AARCH64_4K page
 table format

Boris,

On 3/17/25 10:44 AM, Boris Brezillon wrote:
> On Mon, 17 Mar 2025 09:40:42 -0300
> Ariel D'Alessandro <ariel.dalessandro@...labora.com> wrote:
> 
>> +static int panfrost_mmu_cfg_init(struct panfrost_mmu *mmu,
>> +				  enum io_pgtable_fmt fmt)
>> +{
>> +	struct panfrost_device *pfdev = mmu->pfdev;
>> +
>> +	switch (fmt) {
>> +	case ARM_64_LPAE_S1:
>> +		return mmu_cfg_init_aarch64_4k(mmu);
>> +	case ARM_MALI_LPAE:
>> +		return mmu_cfg_init_mali_lpae(mmu);
>> +	default:
>> +		/* This should never happen */
>> +		return drm_WARN_ON(pfdev->ddev, -EINVAL);
> 
> This won't return -EINVAL, but !!(-EINVAL), AKA true. We should do
> 
> 	default:
> 		drm_WARN(ptdev->ddev, "Invalid pgtable format");
> 		return -EINVAL;
> 
> instead.

Ah, good catch. I missed that from the WARN_ON definition:

         int __ret_warn_on = !!(condition);

Thanks, will fix in v4.

-- 
Ariel D'Alessandro
Software Engineer

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