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Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails

From Arnd Bergmann <arnd@arndb.de>
Newsgroups linux.kernel
Subject Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails
Date 2015-11-10 23:10 +0100
Message-ID <qtph1-2up-29@gated-at.bofh.it> (permalink)
References <qsJUu-88f-9@gated-at.bofh.it> <qtp7k-2b1-7@gated-at.bofh.it> <qtp7k-2b1-5@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Tuesday 10 November 2015 15:59:18 Timur Tabi wrote:
> On 11/10/2015 03:54 PM, Arnd Bergmann wrote:
> 
> >> In our drivers for 32-bit devices, we have to explicitly set the DMA
> >> mask to 32-bits in order to get any DMA working.
> >
> > Do you mean PCI devices or platform devices?
> 
> Platform.
> 
> > Maybe the parent bus is lacking a dma-ranges property?
> 
> All of this applies only on device-tree platforms.  Sinan and I are 
> working on an ACPI server platform.  So we never call 
> of_dma_configure(), and we don't have a dma-ranges property.

ACPI must have something else to mark DMA master devices and their
capabilities, right?

The platform should initialize the dma_mask pointer to a per-device
mask and set both the dma_mask and dma_coherent_mask to 32 bits
for any DMA master device, and the device driver should override
that to be an appropriate mask based on its needs later.

	Arnd
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Thread

[PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-09 03:00 +0100
  Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Hannes Reinecke <hare@suse.de> - 2015-11-09 08:20 +0100
    Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-09 10:10 +0100
      Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-09 15:10 +0100
        Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-09 15:40 +0100
          Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Timur Tabi <timur@codeaurora.org> - 2015-11-10 00:30 +0100
          Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 00:30 +0100
            Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 09:50 +0100
              Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 17:10 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 17:50 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Timur Tabi <timur@codeaurora.org> - 2015-11-10 18:10 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 20:20 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Timur Tabi <timur@codeaurora.org> - 2015-11-10 22:10 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Timur Tabi <timur@codeaurora.org> - 2015-11-10 23:00 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 23:10 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 23:00 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 18:20 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-11-10 19:30 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 20:20 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-11-10 20:50 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 21:00 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-11-10 21:10 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 21:30 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-11-10 21:40 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 21:00 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-10 22:00 +0100
                Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Arnd Bergmann <arnd@arndb.de> - 2015-11-10 23:10 +0100
    Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA  fails Sinan Kaya <okaya@codeaurora.org> - 2015-11-09 15:10 +0100

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