From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: Will Deacon <will.deacon@arm.com>
Cc: Alan Stern <stern@rowland.harvard.edu>,
Ming Lei <ming.lei@canonical.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
Mark Salter <msalter@redhat.com>
Subject: Re: [PATCH 0/3] RFC: addition to DMA API
Date: Thu, 1 Sep 2011 19:07:53 +0100 [thread overview]
Message-ID: <20110901180753.GB15814@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110901173149.GE2803@e102144-lin.cambridge.arm.com>
On Thu, Sep 01, 2011 at 06:31:49PM +0100, Will Deacon wrote:
> Given that I believe our coherent DMA memory is `cacheable, bufferable, do
> not allocate' in terms of AXI attributes, then writes will go straight to
> the write buffer on the PL310.
It's TEXCB=001, which due to the PRRR and NMRR registers is memory type
10, inner policy 00 outer policy 00, which translated means (as I said)
"Normal memory", "non-cacheable" at both the inner and outer levels.
How that gets translated to AXI attributes is outside the scope of the
ARM ARM, it's probably in some mega secret AXI document somewhere which
I don't have access to.
WARNING: multiple messages have this Message-ID (diff)
From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/3] RFC: addition to DMA API
Date: Thu, 1 Sep 2011 19:07:53 +0100 [thread overview]
Message-ID: <20110901180753.GB15814@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110901173149.GE2803@e102144-lin.cambridge.arm.com>
On Thu, Sep 01, 2011 at 06:31:49PM +0100, Will Deacon wrote:
> Given that I believe our coherent DMA memory is `cacheable, bufferable, do
> not allocate' in terms of AXI attributes, then writes will go straight to
> the write buffer on the PL310.
It's TEXCB=001, which due to the PRRR and NMRR registers is memory type
10, inner policy 00 outer policy 00, which translated means (as I said)
"Normal memory", "non-cacheable" at both the inner and outer levels.
How that gets translated to AXI attributes is outside the scope of the
ARM ARM, it's probably in some mega secret AXI document somewhere which
I don't have access to.
next prev parent reply other threads:[~2011-09-01 18:08 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-31 21:30 [PATCH 0/3] RFC: addition to DMA API Mark Salter
2011-08-31 21:30 ` Mark Salter
2011-08-31 21:30 ` [PATCH 1/3] add dma_coherent_write_sync " Mark Salter
2011-08-31 21:30 ` Mark Salter
2011-09-01 2:59 ` Josh Cartwright
2011-09-01 2:59 ` Josh Cartwright
2011-09-01 9:57 ` Michał Mirosław
2011-09-01 9:57 ` Michał Mirosław
2011-09-01 12:36 ` Mark Salter
2011-09-01 12:36 ` Mark Salter
2011-09-06 14:30 ` Catalin Marinas
2011-09-06 14:30 ` Catalin Marinas
2011-08-31 21:30 ` [PATCH 2/3] define ARM-specific dma_coherent_write_sync Mark Salter
2011-08-31 21:30 ` Mark Salter
2011-09-06 14:32 ` Catalin Marinas
2011-09-06 14:32 ` Catalin Marinas
2011-09-06 14:37 ` Mark Salter
2011-09-06 14:37 ` Mark Salter
2011-09-06 14:48 ` Catalin Marinas
2011-09-06 14:48 ` Catalin Marinas
2011-09-06 15:02 ` Mark Salter
2011-09-06 15:02 ` Mark Salter
2011-10-03 1:40 ` Jon Masters
2011-10-03 1:40 ` Jon Masters
2011-10-03 8:44 ` Catalin Marinas
2011-10-03 8:44 ` Catalin Marinas
2011-10-03 9:24 ` Jon Masters
2011-10-03 9:24 ` Jon Masters
2011-08-31 21:30 ` [PATCH 3/3] add dma_coherent_write_sync calls to USB EHCI driver Mark Salter
2011-08-31 21:30 ` Mark Salter
2011-09-01 2:33 ` Ming Lei
2011-09-01 2:33 ` Ming Lei
2011-09-01 2:09 ` [PATCH 0/3] RFC: addition to DMA API Ming Lei
2011-09-01 2:09 ` Ming Lei
2011-09-01 3:09 ` Alan Stern
2011-09-01 3:09 ` Alan Stern
2011-09-01 3:41 ` Ming Lei
2011-09-01 3:41 ` Ming Lei
2011-09-01 8:45 ` Will Deacon
2011-09-01 8:45 ` Will Deacon
2011-09-01 9:14 ` Ming Lei
2011-09-01 9:14 ` Ming Lei
2011-09-01 15:42 ` Alan Stern
2011-09-01 15:42 ` Alan Stern
2011-09-01 16:04 ` Russell King - ARM Linux
2011-09-01 16:04 ` Russell King - ARM Linux
2011-09-01 17:31 ` Will Deacon
2011-09-01 17:31 ` Will Deacon
2011-09-01 18:07 ` Russell King - ARM Linux [this message]
2011-09-01 18:07 ` Russell King - ARM Linux
2011-09-01 19:14 ` Mark Salter
2011-09-01 19:14 ` Mark Salter
2011-09-01 15:22 ` Alan Stern
2011-09-01 15:22 ` Alan Stern
2011-09-01 15:56 ` Ming Lei
2011-09-01 15:56 ` Ming Lei
2011-09-01 16:48 ` Alan Stern
2011-09-01 16:48 ` Alan Stern
2011-09-02 0:59 ` Ming Lei
2011-09-02 0:59 ` Ming Lei
2011-09-02 13:53 ` Alan Stern
2011-09-02 13:53 ` Alan Stern
2011-09-01 9:11 ` Will Deacon
2011-09-01 9:11 ` Will Deacon
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