linux-kernel - Re: [PATCH 1/4] PCI: cadence: Add support to build pcie-cadence library as a kernel module

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Message-ID: <20250318074917.inhspuuypxmaioqe@thinkpad>
Date: Tue, 18 Mar 2025 13:19:17 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Siddharth Vadapalli <s-vadapalli@...com>
Cc: lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
	bhelgaas@...gle.com, vigneshr@...com, kishon@...nel.org,
	cassel@...nel.org, wojciech.jasko-EXT@...tinental-corporation.com,
	thomas.richard@...tlin.com, bwawrzyn@...co.com,
	linux-pci@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	srk@...com
Subject: Re: [PATCH 1/4] PCI: cadence: Add support to build pcie-cadence
 library as a kernel module

On Fri, Mar 14, 2025 at 12:24:44PM +0530, Siddharth Vadapalli wrote:
> On Thu, Mar 13, 2025 at 11:14:16PM +0530, Manivannan Sadhasivam wrote:
> 
> Hello Mani,
> 
> > On Fri, Mar 07, 2025 at 04:01:25PM +0530, Siddharth Vadapalli wrote:
> > > From: Kishon Vijay Abraham I <kishon@...com>
> > > 
> > > Currently, the Cadence PCIe controller driver can be built as a built-in
> > > module only. Since PCIe functionality is not a necessity for booting, add
> > > support to build the Cadence PCIe driver as a loadable module as well.
> > > 
> > > Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> > > Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> > 
> > Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > 
> > > ---
> > >  drivers/pci/controller/cadence/Kconfig             |  6 +++---
> > >  drivers/pci/controller/cadence/pcie-cadence-ep.c   |  6 ++++++
> > >  drivers/pci/controller/cadence/pcie-cadence-host.c |  9 +++++++++
> > >  drivers/pci/controller/cadence/pcie-cadence.c      | 12 ++++++++++++
> > >  drivers/pci/controller/cadence/pcie-cadence.h      |  4 ++--
> > >  5 files changed, 32 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/drivers/pci/controller/cadence/Kconfig b/drivers/pci/controller/cadence/Kconfig
> > > index 8a0044bb3989..82b58096eea0 100644
> > > --- a/drivers/pci/controller/cadence/Kconfig
> > > +++ b/drivers/pci/controller/cadence/Kconfig
> > > @@ -4,16 +4,16 @@ menu "Cadence-based PCIe controllers"
> > >  	depends on PCI
> > >  
> > >  config PCIE_CADENCE
> > > -	bool
> > > +	tristate
> > >  
> > >  config PCIE_CADENCE_HOST
> > > -	bool
> > > +	tristate
> > >  	depends on OF
> > >  	select IRQ_DOMAIN
> > 
> > Even though this was added earlier, looks like not needed.
> 
> Thank you for reviewing this patch.
> 
> drivers/pci/controller/cadence/Kconfig has the following:
> ...
> 	config PCIE_CADENCE_HOST
> 		bool
> 		depends on OF
> 		select IRQ_DOMAIN
> 		select PCIE_CADENCE
> ...
> 	config PCI_J721E_HOST
> 		bool "TI J721E PCIe controller (host mode)"
> 		depends on ARCH_K3 || COMPILE_TEST
> 		depends on OF
> 		select PCIE_CADENCE_HOST
> 		select PCI_J721E
> ...
> So PCI_J721E_HOST selects PCIE_CADENCE_HOST which in turn selects
> PCIE_CADENCE. As of now, none of these configs are enabled in
> arm64-defconfig, and they also will not be accepted as built-in modules
> as it will bloat the Linux Image for everyone. For that reason, they are
> all being converted to loadable modules, and their configs will eventually
> be enabled in arm64-defconfig as loadable modules.
> 
> Please let me know if I misunderstood your comment regarding the quoted
> change not being required.
> 

Yes, you misunderstood indeed :) My earlier comment was about IRQ_DOMAIN symbol
which looked like not needed at all.

- Mani

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