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From: Shawn Anastasio <shawn@anastas.io>
To: Alexey Kardashevskiy <aik@ozlabs.ru>, linuxppc-dev@lists.ozlabs.org
Cc: Sam Bobroff <sbobroff@linux.ibm.com>,
	Alistair Popple <alistair@popple.id.au>,
	Oliver O'Halloran <oohall@gmail.com>,
	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, 5 Jun 2019 23:11:06 -0500	[thread overview]
Message-ID: <deb34b5f-9472-2156-e58d-8dbcb0a38979@anastas.io> (raw)
In-Reply-To: <20190530070355.121802-1-aik@ozlabs.ru>

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>

  parent reply	other threads:[~2019-06-06  4:12 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 ` Shawn Anastasio [this message]
2019-06-06  7:17   ` [PATCH kernel v3 0/3] powerpc/ioda2: Yet another attempt to allow DMA masks between 32 and 59 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
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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