From: Alistair Popple <alistair@popple.id.au>
To: linuxppc-dev@lists.ozlabs.org
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>,
Sam Bobroff <sbobroff@linux.ibm.com>,
Oliver O'Halloran <oohall@gmail.com>,
Shawn Anastasio <shawn@anastas.io>,
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: Thu, 06 Jun 2019 17:17:38 +1000 [thread overview]
Message-ID: <4003261.yxAxO8Uj8t@townsend> (raw)
In-Reply-To: <deb34b5f-9472-2156-e58d-8dbcb0a38979@anastas.io>
I have been hitting EEH address errors testing this with some network
cards which map/unmap DMA addresses more frequently. For example:
PHB4 PHB#5 Diag-data (Version: 1)
brdgCtl: 00000002
RootSts: 00060020 00402000 a0220008 00100107 00000800
PhbSts: 0000001c00000000 0000001c00000000
Lem: 0000000100000080 0000000000000000 0000000000000080
PhbErr: 0000028000000000 0000020000000000 2148000098000240 a008400000000000
RxeTceErr: 2000000000000000 2000000000000000 c000000000000000 0000000000000000
PblErr: 0000000000020000 0000000000020000 0000000000000000 0000000000000000
RegbErr: 0000004000000000 0000004000000000 61000c4800000000 0000000000000000
PE[000] A/B: 8300b03800000000 8000000000000000
Interestingly the PE[000] A/B data is the same across different cards
and drivers.
- Alistair
On Wednesday, 5 June 2019 11:11:06 PM AEST 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>
next prev parent reply other threads:[~2019-06-06 7:19 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 [this message]
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
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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