From: Christoph Hellwig <hch@lst.de>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Christoph Hellwig <hch@lst.de>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
iommu@lists.linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
Lu Baolu <baolu.lu@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Joerg Roedel <joro@8bytes.org>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device
Date: Tue, 24 Mar 2020 08:54:02 +0100 [thread overview]
Message-ID: <20200324075402.GJ23447@lst.de> (raw)
In-Reply-To: <ffce1af6-a215-dee8-7b5c-2111f43accfd@ozlabs.ru>
On Tue, Mar 24, 2020 at 02:05:54PM +1100, Alexey Kardashevskiy wrote:
> This is for persistent memory which you can DMA to/from but yet it does
> not appear in the system as a normal memory and therefore requires
> special handling anyway (O_DIRECT or DAX, I do not know the exact
> mechanics). All other devices in the system should just run as usual,
> i.e. use 1:1 mapping if possible.
On other systems (x86 and arm) pmem as long as it is page backed does
not require any special handling. This must be some weird way powerpc
fucked up again, and I suspect you'll have to suffer from it.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Joerg Roedel <joro@8bytes.org>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org, Christoph Hellwig <hch@lst.de>,
Lu Baolu <baolu.lu@linux.intel.com>
Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device
Date: Tue, 24 Mar 2020 08:54:02 +0100 [thread overview]
Message-ID: <20200324075402.GJ23447@lst.de> (raw)
In-Reply-To: <ffce1af6-a215-dee8-7b5c-2111f43accfd@ozlabs.ru>
On Tue, Mar 24, 2020 at 02:05:54PM +1100, Alexey Kardashevskiy wrote:
> This is for persistent memory which you can DMA to/from but yet it does
> not appear in the system as a normal memory and therefore requires
> special handling anyway (O_DIRECT or DAX, I do not know the exact
> mechanics). All other devices in the system should just run as usual,
> i.e. use 1:1 mapping if possible.
On other systems (x86 and arm) pmem as long as it is page backed does
not require any special handling. This must be some weird way powerpc
fucked up again, and I suspect you'll have to suffer from it.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Alexey Kardashevskiy <aik@ozlabs.ru>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Robin Murphy <robin.murphy@arm.com>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device
Date: Tue, 24 Mar 2020 08:54:02 +0100 [thread overview]
Message-ID: <20200324075402.GJ23447@lst.de> (raw)
In-Reply-To: <ffce1af6-a215-dee8-7b5c-2111f43accfd@ozlabs.ru>
On Tue, Mar 24, 2020 at 02:05:54PM +1100, Alexey Kardashevskiy wrote:
> This is for persistent memory which you can DMA to/from but yet it does
> not appear in the system as a normal memory and therefore requires
> special handling anyway (O_DIRECT or DAX, I do not know the exact
> mechanics). All other devices in the system should just run as usual,
> i.e. use 1:1 mapping if possible.
On other systems (x86 and arm) pmem as long as it is page backed does
not require any special handling. This must be some weird way powerpc
fucked up again, and I suspect you'll have to suffer from it.
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next prev parent reply other threads:[~2020-03-24 7:54 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-20 14:16 generic DMA bypass flag v2 Christoph Hellwig
2020-03-20 14:16 ` Christoph Hellwig
2020-03-20 14:16 ` Christoph Hellwig
2020-03-20 14:16 ` [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device Christoph Hellwig
2020-03-20 14:16 ` Christoph Hellwig
2020-03-20 14:16 ` Christoph Hellwig
2020-03-20 15:02 ` Greg Kroah-Hartman
2020-03-20 15:02 ` Greg Kroah-Hartman
2020-03-20 15:02 ` Greg Kroah-Hartman
2020-03-23 1:28 ` Alexey Kardashevskiy
2020-03-23 1:28 ` Alexey Kardashevskiy
2020-03-23 1:28 ` Alexey Kardashevskiy
2020-03-23 8:37 ` Christoph Hellwig
2020-03-23 8:37 ` Christoph Hellwig
2020-03-23 8:37 ` Christoph Hellwig
2020-03-23 8:50 ` Christoph Hellwig
2020-03-23 8:50 ` Christoph Hellwig
2020-03-23 8:50 ` Christoph Hellwig
2020-03-23 15:37 ` Aneesh Kumar K.V
2020-03-23 15:37 ` Aneesh Kumar K.V
2020-03-23 15:37 ` Aneesh Kumar K.V
2020-03-23 17:22 ` Christoph Hellwig
2020-03-23 17:22 ` Christoph Hellwig
2020-03-23 17:22 ` Christoph Hellwig
2020-03-24 3:05 ` Alexey Kardashevskiy
2020-03-24 3:05 ` Alexey Kardashevskiy
2020-03-24 3:05 ` Alexey Kardashevskiy
2020-03-24 6:30 ` Aneesh Kumar K.V
2020-03-24 6:30 ` Aneesh Kumar K.V
2020-03-24 6:30 ` Aneesh Kumar K.V
2020-03-24 7:55 ` Christoph Hellwig
2020-03-24 7:55 ` Christoph Hellwig
2020-03-24 7:55 ` Christoph Hellwig
2020-03-24 7:54 ` Christoph Hellwig [this message]
2020-03-24 7:54 ` Christoph Hellwig
2020-03-24 7:54 ` Christoph Hellwig
2020-03-25 4:51 ` Alexey Kardashevskiy
2020-03-25 4:51 ` Alexey Kardashevskiy
2020-03-25 4:51 ` Alexey Kardashevskiy
2020-03-25 8:37 ` Christoph Hellwig
2020-03-25 8:37 ` Christoph Hellwig
2020-03-25 8:37 ` Christoph Hellwig
2020-03-26 1:26 ` Alexey Kardashevskiy
2020-03-26 1:26 ` Alexey Kardashevskiy
2020-03-26 1:26 ` Alexey Kardashevskiy
2020-04-03 8:38 ` Alexey Kardashevskiy
2020-04-03 8:38 ` Alexey Kardashevskiy
2020-04-03 8:38 ` Alexey Kardashevskiy
2020-04-06 11:50 ` Christoph Hellwig
2020-04-06 11:50 ` Christoph Hellwig
2020-04-06 11:50 ` Christoph Hellwig
2020-04-06 13:25 ` Alexey Kardashevskiy
2020-04-06 13:25 ` Alexey Kardashevskiy
2020-04-06 13:25 ` Alexey Kardashevskiy
2020-04-06 17:17 ` Christoph Hellwig
2020-04-06 17:17 ` Christoph Hellwig
2020-04-06 17:17 ` Christoph Hellwig
2020-04-07 10:12 ` Alexey Kardashevskiy
2020-04-07 10:12 ` Alexey Kardashevskiy
2020-04-07 10:12 ` Alexey Kardashevskiy
2020-04-14 6:21 ` Alexey Kardashevskiy
2020-04-14 6:21 ` Alexey Kardashevskiy
2020-04-14 6:21 ` Alexey Kardashevskiy
2020-04-14 6:30 ` Christoph Hellwig
2020-04-14 6:30 ` Christoph Hellwig
2020-04-14 6:30 ` Christoph Hellwig
2020-03-23 8:58 ` Alexey Kardashevskiy
2020-03-23 8:58 ` Alexey Kardashevskiy
2020-03-23 8:58 ` Alexey Kardashevskiy
2020-03-23 17:20 ` Christoph Hellwig
2020-03-23 17:20 ` Christoph Hellwig
2020-03-23 17:20 ` Christoph Hellwig
2020-03-24 3:37 ` Alexey Kardashevskiy
2020-03-24 3:37 ` Alexey Kardashevskiy
2020-03-24 3:37 ` Alexey Kardashevskiy
2020-03-24 4:55 ` Alexey Kardashevskiy
2020-03-24 4:55 ` Alexey Kardashevskiy
2020-03-24 4:55 ` Alexey Kardashevskiy
2020-03-24 7:52 ` Christoph Hellwig
2020-03-24 7:52 ` Christoph Hellwig
2020-03-24 7:52 ` Christoph Hellwig
2020-03-23 12:14 ` Robin Murphy
2020-03-23 12:14 ` Robin Murphy
2020-03-23 12:14 ` Robin Murphy
2020-03-23 12:55 ` Christoph Hellwig
2020-03-23 12:55 ` Christoph Hellwig
2020-03-23 12:55 ` Christoph Hellwig
2020-03-20 14:16 ` [PATCH 2/2] powerpc: use the generic dma_ops_bypass mode Christoph Hellwig
2020-03-20 14:16 ` Christoph Hellwig
2020-03-20 14:16 ` Christoph Hellwig
-- strict thread matches above, loose matches on Subject: below --
2020-03-24 9:39 [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to, struct device Christian Zigotzky
2019-11-13 13:37 generic DMA bypass flag Christoph Hellwig
2019-11-13 13:37 ` [PATCH 1/2] dma-mapping: add a dma_ops_bypass flag to struct device Christoph Hellwig
2019-11-13 13:37 ` Christoph Hellwig
2019-11-13 13:37 ` Christoph Hellwig
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