From: Shawn Anastasio <shawn@anastas.io>
To: Oliver O'Halloran <oohall@gmail.com>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Alistair Popple <alistair@popple.id.au>,
Sam Bobroff <sbobroff@linux.ibm.com>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH kernel v3 0/3] powerpc/ioda2: Yet another attempt to allow DMA masks between 32 and 59
Date: Wed, 12 Jun 2019 14:14:32 -0500 [thread overview]
Message-ID: <eef72f17-0d6f-9fe2-b966-787f29d8f8f1@anastas.io> (raw)
In-Reply-To: <CAOSf1CEoEgWwD2qmBHiCG0B4JjmS0g=SUqm+OEYsbvv11QSARw@mail.gmail.com>
On 6/12/19 1:16 AM, Oliver O'Halloran wrote:
> On Wed, Jun 12, 2019 at 3:06 PM Shawn Anastasio <shawn@anastas.io> wrote:
>>
>> On 6/5/19 11:11 PM, Shawn Anastasio wrote:
>>> On 5/30/19 2:03 AM, Alexey Kardashevskiy wrote:
>>>> This is an attempt to allow DMA masks between 32..59 which are not large
>>>> enough to use either a PHB3 bypass mode or a sketchy bypass. Depending
>>>> on the max order, up to 40 is usually available.
>>>>
>>>>
>>>> This is based on v5.2-rc2.
>>>>
>>>> Please comment. Thanks.
>>>
>>> I have tested this patch set with an AMD GPU that's limited to <64bit
>>> DMA (I believe it's 40 or 42 bit). It successfully allows the card to
>>> operate without falling back to 32-bit DMA mode as it does without
>>> the patches.
>>>
>>> Relevant kernel log message:
>>> ```
>>> [ 0.311211] pci 0033:01 : [PE# 00] Enabling 64-bit DMA bypass
>>> ```
>>>
>>> Tested-by: Shawn Anastasio <shawn@anastas.io>
>>
>> After a few days of further testing, I've started to run into stability
>> issues with the patch applied and used with an AMD GPU. Specifically,
>> the system sometimes spontaneously crashes. Not just EEH errors either,
>> the whole system shuts down in what looks like a checkstop.
>
> Any specific workload? Checkstops are harder to debug without a system
> in the failed state so we'd need to replicate that locally to get a
> decent idea what's up.
I haven't been able to pinpoint the exact cause. The first time it
happened was after about 4 days of uptime while playing a 1080p
video in mpv. The second time was about 5 minutes after booting up
while restoring a firefox session.
next prev parent reply other threads:[~2019-06-12 19:17 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-30 7:03 [PATCH kernel v3 0/3] powerpc/ioda2: Yet another attempt to allow DMA masks between 32 and 59 Alexey Kardashevskiy
2019-05-30 7:03 ` [PATCH kernel v3 1/3] powerpc/iommu: Allow bypass-only for DMA Alexey Kardashevskiy
2019-06-03 2:03 ` David Gibson
2019-05-30 7:03 ` [PATCH kernel v3 2/3] powerpc/powernv/ioda2: Allocate TCE table levels on demand for default DMA window Alexey Kardashevskiy
2019-07-08 7:01 ` alistair
2019-05-30 7:03 ` [PATCH kernel v3 3/3] powerpc/powernv/ioda2: Create bigger default window with 64k IOMMU pages Alexey Kardashevskiy
2019-07-08 7:01 ` alistair
2019-07-09 0:57 ` Alexey Kardashevskiy
2019-06-06 4:11 ` [PATCH kernel v3 0/3] powerpc/ioda2: Yet another attempt to allow DMA masks between 32 and 59 Shawn Anastasio
2019-06-06 7:17 ` Alistair Popple
2019-06-06 12:07 ` Oliver
2019-06-07 1:41 ` Alistair Popple
2019-06-10 5:19 ` Alexey Kardashevskiy
2019-06-12 5:05 ` Shawn Anastasio
2019-06-12 6:16 ` Oliver O'Halloran
2019-06-12 19:14 ` Shawn Anastasio [this message]
2019-06-12 7:07 ` Alexey Kardashevskiy
2019-06-12 19:15 ` Shawn Anastasio
2019-06-18 4:26 ` Shawn Anastasio
2019-06-18 6:39 ` Alexey Kardashevskiy
2019-06-18 7:00 ` Shawn Anastasio
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