linux-kernel - Re: [RFC KERNEL PATCH v4 3/3] PCI/sysfs: Add gsi sysfs for pci

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Message-ID:
 <BL1PR12MB58494E7F0735B26A44D7F683E7752@BL1PR12MB5849.namprd12.prod.outlook.com>
Date: Mon, 22 Jan 2024 06:36:07 +0000
From: "Chen, Jiqian" <Jiqian.Chen@....com>
To: Bjorn Helgaas <bhelgaas@...gle.com>, "linux-pci@...r.kernel.org"
	<linux-pci@...r.kernel.org>
CC: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
	Juergen Gross <jgross@...e.com>, Stefano Stabellini <sstabellini@...nel.org>,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>, Boris Ostrovsky
	<boris.ostrovsky@...cle.com>, Roger Pau Monné
	<roger.pau@...rix.com>, "xen-devel@...ts.xenproject.org"
	<xen-devel@...ts.xenproject.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-acpi@...r.kernel.org"
	<linux-acpi@...r.kernel.org>, "Hildebrand, Stewart"
	<Stewart.Hildebrand@....com>, "Huang, Ray" <Ray.Huang@....com>, "Chen,
 Jiqian" <Jiqian.Chen@....com>
Subject: Re: [RFC KERNEL PATCH v4 3/3] PCI/sysfs: Add gsi sysfs for pci_dev

Hi Bjorn Helgaas,

Do you have any comments on this patch?

On 2024/1/5 14:22, Chen, Jiqian wrote:
> There is a need for some scenarios to use gsi sysfs.
> For example, when xen passthrough a device to dumU, it will
> use gsi to map pirq, but currently userspace can't get gsi
> number.
> So, add gsi sysfs for that and for other potential scenarios.
> 
> Co-developed-by: Huang Rui <ray.huang@....com>
> Signed-off-by: Jiqian Chen <Jiqian.Chen@....com>
> ---
>  drivers/acpi/pci_irq.c  |  1 +
>  drivers/pci/pci-sysfs.c | 11 +++++++++++
>  include/linux/pci.h     |  2 ++
>  3 files changed, 14 insertions(+)
> 
> diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
> index 630fe0a34bc6..739a58755df2 100644
> --- a/drivers/acpi/pci_irq.c
> +++ b/drivers/acpi/pci_irq.c
> @@ -449,6 +449,7 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
>  		kfree(entry);
>  		return 0;
>  	}
> +	dev->gsi = gsi;
>  
>  	rc = acpi_register_gsi(&dev->dev, gsi, triggering, polarity);
>  	if (rc < 0) {
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 2321fdfefd7d..c51df88d079e 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -71,6 +71,16 @@ static ssize_t irq_show(struct device *dev,
>  }
>  static DEVICE_ATTR_RO(irq);
>  
> +static ssize_t gsi_show(struct device *dev,
> +			struct device_attribute *attr,
> +			char *buf)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +
> +	return sysfs_emit(buf, "%u\n", pdev->gsi);
> +}
> +static DEVICE_ATTR_RO(gsi);
> +
>  static ssize_t broken_parity_status_show(struct device *dev,
>  					 struct device_attribute *attr,
>  					 char *buf)
> @@ -596,6 +606,7 @@ static struct attribute *pci_dev_attrs[] = {
>  	&dev_attr_revision.attr,
>  	&dev_attr_class.attr,
>  	&dev_attr_irq.attr,
> +	&dev_attr_gsi.attr,
>  	&dev_attr_local_cpus.attr,
>  	&dev_attr_local_cpulist.attr,
>  	&dev_attr_modalias.attr,
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index dea043bc1e38..0618d4a87a50 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -529,6 +529,8 @@ struct pci_dev {
>  
>  	/* These methods index pci_reset_fn_methods[] */
>  	u8 reset_methods[PCI_NUM_RESET_METHODS]; /* In priority order */
> +
> +	unsigned int	gsi;
>  };
>  
>  static inline struct pci_dev *pci_physfn(struct pci_dev *dev)

-- 
Best regards,
Jiqian Chen.