drm/amdkfd: Change pasid's type to unsigned int

Zhao, Yong Yong.Zhao at amd.com
Sat May 23 03:14:59 UTC 2020

[AMD Official Use Only - Internal Distribution Only]

Hi Fenghua,

I am okay with the idea.

From: Fenghua Yu <fenghua.yu at intel.com>
Sent: Friday, May 22, 2020 5:21 PM
To: Kuehling, Felix <Felix.Kuehling at amd.com>
Cc: Zhao, Yong <Yong.Zhao at amd.com>; amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Subject: Re: drm/amdkfd: Change pasid's type to unsigned int

Hi, Felix,

On Fri, May 22, 2020 at 03:40:06PM -0400, Felix Kuehling wrote:
> Hi Fenghua,
> The PASID width in KFD is currently limited to 16 bits. I believe this
> reflects what our hardware can handle. KFD will never allocate a PASID
> bigger than 16 bits. That said, I'm OK with changing this field in the
> kfd_process structure to unsigned int. Generally, I find uint16_t in
> structures not very useful except in tightly packed structures such as
> packet formats or ioctl arguments.

Thank you very much for your insight!

I'm writing the patch set to define pasid as "unsigned int" consistently
in iommu. I'll put the amdkfd changes (only a few changes including this
pasid change in struct kfd_processin) one patch and send it to you for

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