linux-kernel - Re: [PATCH v2 3/4] PCI: generic, thunder: update to use generic ECAM API

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Date:	Mon, 11 Apr 2016 17:34:34 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Jayachandran C <jchandra@...adcom.com>
CC:	Bjorn Helgaas <helgaas@...nel.org>,
	Tomasz Nowicki <tn@...ihalf.com>, <rafael@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Will Deacon <will.deacon@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	<okaya@...eaurora.org>, <jiang.liu@...ux.intel.com>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	<robert.richter@...iumnetworks.com>,
	Marcin Wojtas <mw@...ihalf.com>, <Liviu.Dudau@....com>,
	<wangyijing@...wei.com>, <Suravee.Suthikulpanit@....com>,
	<msalter@...hat.com>, <linux-pci@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linaro-acpi@...ts.linaro.org>, Jon Masters <jcm@...hat.com>
Subject: Re: [PATCH v2 3/4] PCI: generic, thunder: update to use generic ECAM
 API

On 04/11/2016 03:45 PM, Jayachandran C wrote:
> Use functions provided by drivers/pci/ecam.h for mapping the config
> space in drivers/pci/host/pci-host-common.c, and update its users to
> use 'struct pci_config_window' and 'struct pci_generic_ecam_ops'
>
> The changes are mostly to use 'struct pci_config_window' in place of
> 'struct gen_pci'. Some of the fields of gen_pci were only used
> temporarily and can be eliminated by using local variables or function
> arguments, these are not carried over to struct pci_config_window.
>
> pci-thunder-ecam.c and pci-thunder-pem.c are the only users of the
> pci_host_common_probe function and the gen_pci structure, these have
> been updated to use the new API as well.
>
> The patch does not introduce any functional changes other than a very
> minor one: with the new code, on 64-bit platforms, we do just a single
> ioremap for the whole config space.
>
> Signed-off-by: Jayachandran C <jchandra@...adcom.com>

Tested-by: David Daney <david.daney@...ium.com>

However, ...

> ---
>   drivers/pci/ecam.h                  |   5 ++
>   drivers/pci/host/Kconfig            |   1 +
>   drivers/pci/host/pci-host-common.c  | 121 ++++++++++++++++--------------------
>   drivers/pci/host/pci-host-common.h  |  47 --------------
>   drivers/pci/host/pci-host-generic.c |  50 +++------------
>   drivers/pci/host/pci-thunder-ecam.c |  37 +++--------
>   drivers/pci/host/pci-thunder-pem.c  |  53 +++++-----------

... The patch conflicts with a bug-fix patch I just sent to 
pci-thunder-pem.c, so there will be a race to see who gets in first.

Also, I don't know if it would make sense to split out the pci-thunder-* 
changes to a separate patch.


>   7 files changed, 93 insertions(+), 221 deletions(-)
>   delete mode 100644 drivers/pci/host/pci-host-common.h
>
[...]