From mboxrd@z Thu Jan 1 00:00:00 1970 From: arnd@arndb.de (Arnd Bergmann) Date: Fri, 5 Apr 2013 22:41:14 +0200 Subject: [PATCH v2 1/9] arm: mvebu: Limit the DMA zone when LPAE is selected In-Reply-To: <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com> References: <1365193444-13441-1-git-send-email-gregory.clement@free-electrons.com> <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com> Message-ID: <201304052241.14865.arnd@arndb.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Friday 05 April 2013, Gregory CLEMENT wrote: > When LPAE is activated on Armada XP, all registers and IOs are still > 32bit, the 40bit extension is on the CPU to DRAM path (windows) only. > That means that all the DMA transfer are restricted to the low 32 bits > address space. This is limitation is achieved by selecting ZONE_DMA. > > Signed-off-by: Gregory CLEMENT Shouldn't that be ZONE_DMA32? Arnd From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnd Bergmann Subject: Re: [PATCH v2 1/9] arm: mvebu: Limit the DMA zone when LPAE is selected Date: Fri, 5 Apr 2013 22:41:14 +0200 Message-ID: <201304052241.14865.arnd@arndb.de> References: <1365193444-13441-1-git-send-email-gregory.clement@free-electrons.com> <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=m.gmane.org@lists.infradead.org To: Gregory CLEMENT Cc: Lior Amsalem , Andrew Lunn , Ike Pan , Grant Likely , David Marlin , Yehuda Yitschak , Tawfik Bayouk , Dan Frazier , Eran Ben-Avi , Ezequiel Garcia , Leif Lindholm , Sebastian Hesselbarth , Jason Cooper , Nadav Haklai , Jon Masters , devicetree-discuss@lists.ozlabs.org, Rob Herring , linux-arm-kernel@lists.infradead.org, Thomas Petazzoni , Chris Van Hoof , Nicolas Pitre , linux-kernel@vger.kernel.org, Maen Suleiman List-Id: devicetree@vger.kernel.org On Friday 05 April 2013, Gregory CLEMENT wrote: > When LPAE is activated on Armada XP, all registers and IOs are still > 32bit, the 40bit extension is on the CPU to DRAM path (windows) only. > That means that all the DMA transfer are restricted to the low 32 bits > address space. This is limitation is achieved by selecting ZONE_DMA. > > Signed-off-by: Gregory CLEMENT Shouldn't that be ZONE_DMA32? Arnd From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1162791Ab3DEUmI (ORCPT ); Fri, 5 Apr 2013 16:42:08 -0400 Received: from moutng.kundenserver.de ([212.227.17.9]:63541 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1162655Ab3DEUmF (ORCPT ); Fri, 5 Apr 2013 16:42:05 -0400 From: Arnd Bergmann To: Gregory CLEMENT Subject: Re: [PATCH v2 1/9] arm: mvebu: Limit the DMA zone when LPAE is selected Date: Fri, 5 Apr 2013 22:41:14 +0200 User-Agent: KMail/1.12.2 (Linux/3.8.0-16-generic; KDE/4.3.2; x86_64; ; ) Cc: Jason Cooper , Andrew Lunn , Grant Likely , Rob Herring , Thomas Petazzoni , Ezequiel Garcia , linux-arm-kernel@lists.infradead.org, devicetree-discuss@lists.ozlabs.org, linux-kernel@vger.kernel.org, Olof Johansson , Nicolas Pitre , Lior Amsalem , Maen Suleiman , Tawfik Bayouk , Shadi Ammouri , "Eran Ben-Avi" , Yehuda Yitschak , Nadav Haklai , Ike Pan , Chris Van Hoof , Dan Frazier , Leif Lindholm , Jon Masters , David Marlin , Sebastian Hesselbarth References: <1365193444-13441-1-git-send-email-gregory.clement@free-electrons.com> <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com> In-Reply-To: <1365193444-13441-2-git-send-email-gregory.clement@free-electrons.com> MIME-Version: 1.0 Content-Type: Text/Plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Message-Id: <201304052241.14865.arnd@arndb.de> X-Provags-ID: V02:K0:f3UZ0tGhitqCXNPPs+WjZrk4BsGsQ7v7xDraWcjf9lR jEW4mtrmIMIPQ0q/1myMo4M9QQxLybxhzdG7W7nrLppNCVec3a z0EXZ1VdfUMehHlbWe+3nZ5RaZJSPU3cRl87Ga7XwHseKOpYKr o72sdKPABSD/ITVkWsownGK9Tly7OhDDkGV3QvTRZHLc96ch7M QLWWG55neEhAWebBiQVT7m5I/xhvbskFpgmiuenbvikAGxmqQA dUqaVQnviQNq/BR+1rZSQJDH5bwVErnWwHGKaW8yWi+79ftgB0 VArfiQpqFbDtYaswr6tH4gwMzS9I7z0ktoD0f1zjIo4XRSKNuh 05tBQxWs80zaJUYV1/ag= Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Friday 05 April 2013, Gregory CLEMENT wrote: > When LPAE is activated on Armada XP, all registers and IOs are still > 32bit, the 40bit extension is on the CPU to DRAM path (windows) only. > That means that all the DMA transfer are restricted to the low 32 bits > address space. This is limitation is achieved by selecting ZONE_DMA. > > Signed-off-by: Gregory CLEMENT Shouldn't that be ZONE_DMA32? Arnd