linux-kernel - Re: [PATCH 2/8] PCI PM: PCIe PME root port service driver (rev. 5)

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Date:	Thu, 18 Feb 2010 13:08:23 +0900
From:	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Moore, Robert" <robert.moore@...el.com>,
	Len Brown <lenb@...nel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Oliver Neukum <oliver@...kum.org>,
	Matthew Garrett <mjg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Gary Hade <garyhade@...ibm.com>
Subject: Re: [PATCH 2/8] PCI PM: PCIe PME root port service driver (rev. 5)

Hi,

I'm sorry for the delayed comments.

> +
> +/**
> + * pcie_pme_interrupt_enable - Enable/disable PCIe PME interrupt generation.
> + * @dev: PCIe root port or event collector.
> + * @enable: Enable or disable the interrupt.
> + */
> +static void pcie_pme_interrupt_enable(struct pci_dev *dev, bool enable)
> +{
> +	int rtctl_pos;
> +	u16 rtctl;
> +
> +	rtctl_pos = pci_find_capability(dev, PCI_CAP_ID_EXP) + PCI_EXP_RTCTL;

How about

	rtctl_pos = pci_pcie_cap(dev) + PCI_EXP_RTCTL;

?

The pci_pcie_cap() returns PCIe capability offset saved in struct pci_dev.
By using this, we can avoid redundant search in PCI configuration space.

> +
> +/**
> + * pcie_pme_clear_status - Clear root port PME interrupt status.
> + * @dev: PCIe root port or event collector.
> + */
> +static void pcie_pme_clear_status(struct pci_dev *dev)
> +{
> +	int rtsta_pos;
> +	u32 rtsta;
> +
> +	rtsta_pos = pci_find_capability(dev, PCI_CAP_ID_EXP) + PCI_EXP_RTSTA;

Ditto.


> +/**
> + * pcie_pme_work_fn - Work handler for PCIe PME interrupt.
> + * @work: Work structure giving access to service data.
> + */
> +static void pcie_pme_work_fn(struct work_struct *work)
> +{
> +	struct pcie_pme_service_data *data =
> +			container_of(work, struct pcie_pme_service_data, work);
> +	struct pci_dev *port = data->srv->port;
> +	int rtsta_pos;
> +	u32 rtsta;
> +
> +	rtsta_pos = pci_find_capability(port, PCI_CAP_ID_EXP) + PCI_EXP_RTSTA;

Ditto.


> +/**
> + * pcie_pme_irq - Interrupt handler for PCIe root port PME interrupt.
> + * @irq: Interrupt vector.
> + * @context: Interrupt context pointer.
> + */
> +static irqreturn_t pcie_pme_irq(int irq, void *context)
> +{
> +	struct pci_dev *port;
> +	struct pcie_pme_service_data *data;
> +	int rtsta_pos;
> +	u32 rtsta;
> +	unsigned long flags;
> +
> +	port = ((struct pcie_device *)context)->port;
> +	data = get_service_data((struct pcie_device *)context);
> +
> +	rtsta_pos = pci_find_capability(port, PCI_CAP_ID_EXP) + PCI_EXP_RTSTA;

Ditto.


Thanks,
Kenji Kaneshige

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