linux-kernel - RE: [PATCH v9 4/7] PCI: Add fwnode_handle to pci

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Date:	Fri, 8 Jan 2016 21:57:04 +0000
From:	Jake Oshins <jakeo@...rosoft.com>
To:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"vkuznets@...hat.com" <vkuznets@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"Haiyang Zhang" <haiyangz@...rosoft.com>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: RE: [PATCH v9 4/7] PCI: Add fwnode_handle to pci_sysdata

> -----Original Message-----
> From: jakeo@...rosoft.com [mailto:jakeo@...rosoft.com]
> Sent: Wednesday, December 9, 2015 2:55 PM
> To: gregkh@...uxfoundation.org; KY Srinivasan <kys@...rosoft.com>; linux-
> kernel@...r.kernel.org; devel@...uxdriverproject.org; olaf@...fle.de;
> apw@...onical.com; vkuznets@...hat.com; tglx@...utronix.de; Haiyang
> Zhang <haiyangz@...rosoft.com>; marc.zyngier@....com;
> bhelgaas@...gle.com; linux-pci@...r.kernel.org
> Cc: Jake Oshins <jakeo@...rosoft.com>
> Subject: [PATCH v9 4/7] PCI: Add fwnode_handle to pci_sysdata
> 
> From: Jake Oshins <jakeo@...rosoft.com>
> 
> This patch adds an fwnode_handle to struct pci_sysdata, which is
> used by the next patch in the series when trying to locate an
> IRQ domain associated with a root PCI bus.
> 
> Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
> ---
>  arch/x86/include/asm/pci.h | 15 +++++++++++++++
>  drivers/pci/probe.c        |  1 +
>  include/linux/pci.h        |  4 ++++
>  3 files changed, 20 insertions(+)
> 
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 4625943..6fc3c7c 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -20,6 +20,9 @@ struct pci_sysdata {
>  #ifdef CONFIG_X86_64
>  	void		*iommu;		/* IOMMU private data */
>  #endif
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +	void		*fwnode;	/* IRQ domain for MSI assignment */
> +#endif
>  };
> 
>  extern int pci_routeirq;
> @@ -32,6 +35,7 @@ extern int noioapicreroute;
>  static inline int pci_domain_nr(struct pci_bus *bus)
>  {
>  	struct pci_sysdata *sd = bus->sysdata;
> +
>  	return sd->domain;
>  }
> 
> @@ -41,6 +45,17 @@ static inline int pci_proc_domain(struct pci_bus *bus)
>  }
>  #endif
> 
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
> +{
> +	struct pci_sysdata *sd = bus->sysdata;
> +
> +	return sd->fwnode;
> +}
> +
> +#define pci_root_bus_fwnode	_pci_root_bus_fwnode
> +#endif
> +
>  /* Can be used to override the logic in pci_scan_bus for skipping
>     already-configured bus numbers - to be used for buggy BIOSes
>     or architectures with incomplete PCI setup by the loader */
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index edb1984..750f907 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -15,6 +15,7 @@
>  #include <linux/pci-aspm.h>
>  #include <linux/aer.h>
>  #include <linux/acpi.h>
> +#include <linux/irqdomain.h>
>  #include <asm-generic/pci-bridge.h>
>  #include "pci.h"
> 
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 6ae25aa..b414422 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1517,6 +1517,10 @@ static inline int pci_get_new_domain_nr(void) {
> return -ENOSYS; }
> 
>  #include <asm/pci.h>
> 
> +#ifndef pci_root_bus_fwnode
> +#define pci_root_bus_fwnode(bus)	((void)(bus), NULL)
> +#endif
> +
>  /* these helpers provide future and backwards compatibility
>   * for accessing popular PCI BAR info */
>  #define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)
> --
> 1.9.1


Bjorn, are you willing to take this patch and the next one in the series through your tree?  The other patches in this series have already been taken into linux-next by either Greg K-H or Thomas Gleixner, or they're dependent on these two.  Thomas has suggested that the PCI tree would be the right one to incorporate them.

Thanks,
Jake Oshins