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From: "Bridgman, John" <John.Bridgman-5C7GfCeVMHo@public.gmane.org>
To: "Liu, Shaoyun" <Shaoyun.Liu-5C7GfCeVMHo@public.gmane.org>,
	"tstellar-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
	<tstellar-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Felix Kühling"
	<felix.kuehling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	"amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org"
	<amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>
Cc: "Kuehling, Felix" <Felix.Kuehling-5C7GfCeVMHo@public.gmane.org>
Subject: RE: PCIe3 atomics requirement for amdkfd
Date: Wed, 3 Jan 2018 16:40:24 +0000	[thread overview]
Message-ID: <BN6PR12MB13488C42642B464E0CD6B5EFE81E0@BN6PR12MB1348.namprd12.prod.outlook.com> (raw)
In-Reply-To: <DM5PR12MB1179B2F3C378819556589747F41E0-2J9CzHegvk8p/eksZXEfgQdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>

Agreed - MEC microcode uses atomics when the queue type is set to AQL (rather than PM4).

>-----Original Message-----
>From: amd-gfx [mailto:amd-gfx-bounces@lists.freedesktop.org] On Behalf Of
>Liu, Shaoyun
>Sent: Wednesday, January 03, 2018 11:24 AM
>To: tstellar@redhat.com; Felix Kühling; amd-gfx@lists.freedesktop.org
>Cc: Kuehling, Felix
>Subject: RE: PCIe3 atomics requirement for amdkfd
>
>I think currently atomic  Ops are only used in AQL package which is only
>available for ROCm , graphics workload will not use AQL package.
>
>Regards
>Shaoyun.liu
>
>-----Original Message-----
>From: amd-gfx [mailto:amd-gfx-bounces@lists.freedesktop.org] On Behalf Of
>Tom Stellard
>Sent: Wednesday, January 03, 2018 9:57 AM
>To: Felix Kühling; amd-gfx@lists.freedesktop.org
>Cc: Kuehling, Felix
>Subject: Re: PCIe3 atomics requirement for amdkfd
>
>On 12/23/2017 07:40 AM, Felix Kühling wrote:
>> As I understand it, it would require changes in the ROCr Runtime and
>> in the firmware (MEC microcode). It also changes the programming
>> model, so it may affect certain applications or higher level language
>> runtimes that rely on atomic operations.
>>
>
>How does the MEC microcode know that it is running a ROCm workload as
>opposed to a graphics workload that doesn't require PCIe3 atomics.  Is there a
>specific configuration bit that is set to indicate the ROCm programming model
>is needed?
>
>-Tom
>
>> Regards,
>>   Felix
>>
>>
>> Am 19.12.2017 um 16:04 schrieb Tom Stellard:
>>> Hi,
>>>
>>> How hard of a requirement is PCIe3 atomics for dGPUs with the amdkfd
>>> kernel driver?  Is it possible to make modifications to the
>>> runtime/kernel driver to drop this requirement?
>>>
>>> -Tom
>>> _______________________________________________
>>> amd-gfx mailing list
>>> amd-gfx@lists.freedesktop.org
>>> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>>
>>
>
>_______________________________________________
>amd-gfx mailing list
>amd-gfx@lists.freedesktop.org
>https://lists.freedesktop.org/mailman/listinfo/amd-gfx
>_______________________________________________
>amd-gfx mailing list
>amd-gfx@lists.freedesktop.org
>https://lists.freedesktop.org/mailman/listinfo/amd-gfx
_______________________________________________
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  parent reply	other threads:[~2018-01-03 16:40 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-19 15:04 PCIe3 atomics requirement for amdkfd Tom Stellard
     [not found] ` <c2c34443-9ba1-661b-476d-b657a7ddfe85-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2017-12-23 15:40   ` Felix Kühling
     [not found]     ` <3f7e6fed-8668-b469-8813-e6677cb980ca-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-12-23 16:26       ` Alexander Kjeldaas
     [not found]         ` <CAHVSqQe1Tj+PnCR1h+HiHC=fXC81sUG4MXC7jWwmY+TomuU=9w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-24 10:07           ` Felix Kühling
2018-01-03 14:56       ` Tom Stellard
     [not found]         ` <a5d6072b-6fea-f161-3773-50f58766ed45-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-01-03 16:23           ` Liu, Shaoyun
     [not found]             ` <DM5PR12MB1179B2F3C378819556589747F41E0-2J9CzHegvk8p/eksZXEfgQdYzm3356FpvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2018-01-03 16:40               ` Bridgman, John [this message]
2017-12-25 14:55   ` Luke A. Guest
     [not found]     ` <5a4b1672-4595-7e7f-0d76-9c721b61e98e-z/KZkw/0wg5BDgjK7y7TUQ@public.gmane.org>
2017-12-25 16:44       ` Bridgman, John

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