linux-kernel - Re: [PATCH v7 02/60] sparc/PCI: Use correct bus address to resource offset

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Date:	Fri, 09 Oct 2015 10:16:18 -0600
From:	Khalid Aziz <khalid.aziz@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>, TJ <linux@....tj>,
	Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 02/60] sparc/PCI: Use correct bus address to resource
 offset

On Thu, 2015-10-08 at 14:38 -0700, Yinghai Lu wrote:
> After we add 64bit mmio parsing, we got some "no compatible bridge window"
> warning on anther new model that support 64bit resource.
> 
> It turns out that we can not use mem_space.start as 64bit mem space
> offset, aka mem_space.start != offset.
> 
> Use child_phys_addr to calculate exact offset and recorder offset in
> pbm.  Still assume all mem have same offset, otherwise panic early.
> 
> After patch we get correct offset.
> 
> /pci@305: PCI IO [io  0x2007e00000000-0x2007e0fffffff] offset 2007e00000000
> /pci@305: PCI MEM [mem 0x2000000100000-0x200007effffff] offset 2000000000000
> /pci@305: PCI MEM64 [mem 0x2000100000000-0x2000dffffffff] offset 2000000000000
> ...
> pci_sun4v f02ae7f8: PCI host bridge to bus 0000:00
> pci_bus 0000:00: root bus resource [io  0x2007e00000000-0x2007e0fffffff] (bus address [0x0000-0xfffffff])
> pci_bus 0000:00: root bus resource [mem 0x2000000100000-0x200007effffff] (bus address [0x00100000-0x7effffff])
> pci_bus 0000:00: root bus resource [mem 0x2000100000000-0x2000dffffffff] (bus address [0x100000000-0xdffffffff])
> 
> 
> -v2: to make is simple, do not add mem64_offset, and assume
>      mem64_offset == mem_offset, otherwise would make
>      pci_mmap_resource() path too complicated.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>

Tested on sparc platforms

Tested-by: Khalid Aziz <khalid.aziz@...cle.com> 



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