Re: [PATCH 1/2] [RFC] ata: ahci: Respect bus DMA constraints

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On 3/8/19 8:18 AM, Christoph Hellwig wrote:
> On Thu, Mar 07, 2019 at 12:14:06PM +0100, Marek Vasut wrote:
>>> Right, but whoever *interprets* the device masks after the driver has
>>> overridden them should be taking the (smaller) bus mask into account as
>>> well, so the question is where is *that* not being done correctly?
>>
>> Do you have a hint where I should look for that ?
> 
> If this a 32-bit ARM platform it might the complete lack of support
> for bus_dma_mask in arch/arm/mm/dma-mapping.c..

It's an ARM 64bit platform, just the PCIe controller is limited to 32bit
address range, so the devices on the PCIe bus cannot read the host's
DRAM above the 32bit limit.

-- 
Best regards,
Marek Vasut



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