Re: [PATCH v2 1/3] PCI: endpoint: Handle 64-bit BARs properly

[Kishon Vijay Abraham I]

Hi,

On Thursday 08 February 2018 06:03 PM, Niklas Cassel wrote:
> A 64-bit BAR uses the succeeding BAR for the upper bits, therefore
> we cannot call pci_epc_set_bar() on a BAR that follows a 64-bit BAR.
> 
> If pci_epc_set_bar() is called with flag PCI_BASE_ADDRESS_MEM_TYPE_64,

Not related to $patch. But I have a query on when PCI_BASE_ADDRESS_MEM_TYPE_64
should be set. Whether if the size is > 4G or if the address can be mapped
anywhere in the 64-bit PCIe address space or both?

Thanks
Kishon
> it has to be up to the controller driver to write both BAR[x] and BAR[x+1]
> (and BAR_mask[x] and BAR_mask[x+1]).
> 
> Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
> ---
>  drivers/pci/endpoint/functions/pci-epf-test.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 800da09d9005..eef85820f59e 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -382,6 +382,8 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
>  			if (bar == test_reg_bar)
>  				return ret;
>  		}
> +		if (flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
> +			bar++;
>  	}
>  
>  	return 0;
>