linux-kernel - Re: [PATCH v1 6/9] PCI/portdrv: Remove unused PCIE_PORT_SERVICE

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Date:   Wed, 07 Mar 2018 11:34:26 +0100
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Lukas Wunner <lukas@...ner.de>
Subject: Re: [PATCH v1 6/9] PCI/portdrv: Remove unused PCIE_PORT_SERVICE_VC

On Wednesday, March 7, 2018 7:13:56 AM CET Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> No driver registers for PCIE_PORT_SERVICE_VC, so remove it.
> 
> This removes the VC "service" files from /sys/bus/pci_express/devices,
> e.g., 0000:07:00.0:pcie108, 0000:08:04.0:pcie208 (all the files that
> contained "8" as the last digit of the "pcieXXX" part).  The port driver
> created these files for PCIe port devices that have a VC Capability.
> 
> Since this reduces PCIE_PORT_DEVICE_MAXSERVICES and moves DPC down into the
> spot where VC used to be, the DPC sysfs files will now be named "pcieXX8".
> I don't think there's anything useful userspace can do with those files, so
> I hope nobody cares about these filenames.
> 
> There is no VC driver that calls pcie_port_service_register(), so there
> never was a /sys/bus/pci_express/drivers/vc directory.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/pcie/portdrv.h      |    2 +-
>  drivers/pci/pcie/portdrv_acpi.c |    2 +-
>  drivers/pci/pcie/portdrv_core.c |   14 ++++----------
>  include/linux/pcieport_if.h     |    4 +---
>  4 files changed, 7 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
> index a4fc44d52206..749d200936d9 100644
> --- a/drivers/pci/pcie/portdrv.h
> +++ b/drivers/pci/pcie/portdrv.h
> @@ -12,7 +12,7 @@
>  
>  #include <linux/compiler.h>
>  
> -#define PCIE_PORT_DEVICE_MAXSERVICES   5
> +#define PCIE_PORT_DEVICE_MAXSERVICES   4
>  /*
>   * The PCIe Capability Interrupt Message Number (PCIe r3.1, sec 7.8.2) must
>   * be one of the first 32 MSI-X entries.  Per PCI r3.0, sec 6.8.3.1, MSI
> diff --git a/drivers/pci/pcie/portdrv_acpi.c b/drivers/pci/pcie/portdrv_acpi.c
> index 319c94976873..4a1b50867c98 100644
> --- a/drivers/pci/pcie/portdrv_acpi.c
> +++ b/drivers/pci/pcie/portdrv_acpi.c
> @@ -48,7 +48,7 @@ void pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
>  
>  	flags = root->osc_control_set;
>  
> -	*srv_mask = PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_DPC;
> +	*srv_mask = PCIE_PORT_SERVICE_DPC;
>  	if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
>  		*srv_mask |= PCIE_PORT_SERVICE_HP;
>  	if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
> diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
> index 9db77c683732..94ce4dc50d1a 100644
> --- a/drivers/pci/pcie/portdrv_core.c
> +++ b/drivers/pci/pcie/portdrv_core.c
> @@ -189,10 +189,8 @@ static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
>  	if (ret < 0)
>  		return -ENODEV;
>  
> -	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
> -		if (i != PCIE_PORT_SERVICE_VC_SHIFT)
> -			irqs[i] = pci_irq_vector(dev, 0);
> -	}
> +	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
> +		irqs[i] = pci_irq_vector(dev, 0);
>  
>  	return 0;
>  }
> @@ -212,8 +210,7 @@ static int get_port_device_capability(struct pci_dev *dev)
>  	int services = 0;
>  	int cap_mask = 0;
>  
> -	cap_mask = PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP
> -			| PCIE_PORT_SERVICE_VC;
> +	cap_mask = PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP;
>  	if (pci_aer_available())
>  		cap_mask |= PCIE_PORT_SERVICE_AER | PCIE_PORT_SERVICE_DPC;
>  
> @@ -240,9 +237,6 @@ static int get_port_device_capability(struct pci_dev *dev)
>  		 */
>  		pci_disable_pcie_error_reporting(dev);
>  	}
> -	/* VC support */
> -	if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_VC))
> -		services |= PCIE_PORT_SERVICE_VC;
>  	/* Root ports are capable of generating PME too */
>  	if ((cap_mask & PCIE_PORT_SERVICE_PME)
>  	    && pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT) {
> @@ -332,7 +326,7 @@ int pcie_port_device_register(struct pci_dev *dev)
>  	 */
>  	status = pcie_init_service_irqs(dev, irqs, capabilities);
>  	if (status) {
> -		capabilities &= PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_HP;
> +		capabilities &= PCIE_PORT_SERVICE_HP;
>  		if (!capabilities)
>  			goto error_disable;
>  	}
> diff --git a/include/linux/pcieport_if.h b/include/linux/pcieport_if.h
> index b69769dbf659..28eb21731db6 100644
> --- a/include/linux/pcieport_if.h
> +++ b/include/linux/pcieport_if.h
> @@ -20,9 +20,7 @@
>  #define PCIE_PORT_SERVICE_AER		(1 << PCIE_PORT_SERVICE_AER_SHIFT)
>  #define PCIE_PORT_SERVICE_HP_SHIFT	2	/* Native Hotplug */
>  #define PCIE_PORT_SERVICE_HP		(1 << PCIE_PORT_SERVICE_HP_SHIFT)
> -#define PCIE_PORT_SERVICE_VC_SHIFT	3	/* Virtual Channel */
> -#define PCIE_PORT_SERVICE_VC		(1 << PCIE_PORT_SERVICE_VC_SHIFT)
> -#define PCIE_PORT_SERVICE_DPC_SHIFT	4	/* Downstream Port Containment */
> +#define PCIE_PORT_SERVICE_DPC_SHIFT	3	/* Downstream Port Containment */
>  #define PCIE_PORT_SERVICE_DPC		(1 << PCIE_PORT_SERVICE_DPC_SHIFT)
>  
>  struct pcie_device {
> 
> 

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>