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Date: Wed, 22 Oct 2014 17:53:45 -0600
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Yijing Wang <wangyijing@...wei.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
Xinwei Hu <huxinwei@...wei.com>, Wuyun <wuyun.wu@...wei.com>,
linux-arm-kernel@...ts.infradead.org,
Russell King <linux@....linux.org.uk>,
linux-arch@...r.kernel.org, arnab.basu@...escale.com,
Bharat.Bhushan@...escale.com, x86@...nel.org,
Arnd Bergmann <arnd@...db.de>,
Thomas Gleixner <tglx@...utronix.de>,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
xen-devel@...ts.xenproject.org, Joerg Roedel <joro@...tes.org>,
iommu@...ts.linux-foundation.org, linux-mips@...ux-mips.org,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
Sebastian Ott <sebott@...ux.vnet.ibm.com>,
Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org,
"David S. Miller" <davem@...emloft.net>,
sparclinux@...r.kernel.org, Chris Metcalf <cmetcalf@...era.com>,
Ralf Baechle <ralf@...ux-mips.org>,
Lucas Stach <l.stach@...gutronix.de>,
David Vrabel <david.vrabel@...rix.com>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
Michael Ellerman <mpe@...erman.id.au>,
Thierry Reding <thierry.reding@...il.com>,
Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
Liviu Dudau <liviu@...au.co.uk>
Subject: Re: [PATCH v3 24/27] IA64/MSI: Use MSI chip framework to configure
MSI/MSI-X irq
On Wed, Oct 15, 2014 at 11:07:12AM +0800, Yijing Wang wrote:
> Use MSI chip framework instead of arch MSI functions to configure
> MSI/MSI-X irq. So we can manage MSI/MSI-X irq in a unified framework.
This needs slightly more detail. You're using the MSI chip framework
"instead of arch MSI functions". Well, there are still arch-specific
functions, i.e., arch_ia64_setup_msi_irq() and
arch_ia64_teardown_msi_irq().
We used to have arch_setup_msi_irq() which had a weak default
implementation, and a strong arch-specific implementation here, and you're
replacing that model with the new "msi-ops" model. I don't know how you
want to write that, but it's not that you're getting rid of the
arch-specific code; you're keeping arch-specific code but structuring it
differently.
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
> arch/ia64/include/asm/pci.h | 10 ++++++++++
> arch/ia64/kernel/msi_ia64.c | 14 ++++++++++----
> arch/ia64/pci/pci.c | 1 +
> 3 files changed, 21 insertions(+), 4 deletions(-)
>
> diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
> index 52af5ed..907dcba 100644
> --- a/arch/ia64/include/asm/pci.h
> +++ b/arch/ia64/include/asm/pci.h
> @@ -94,6 +94,7 @@ struct pci_controller {
> int segment;
> int node; /* nearest node with memory or NUMA_NO_NODE for global allocation */
>
> + struct msi_chip *msi_chip;
> void *platform_data;
> };
>
> @@ -101,6 +102,15 @@ struct pci_controller {
> #define PCI_CONTROLLER(busdev) ((struct pci_controller *) busdev->sysdata)
> #define pci_domain_nr(busdev) (PCI_CONTROLLER(busdev)->segment)
>
> +extern struct msi_chip chip;
Please make this name more descriptive. "chip" is way too generic for a
global name.
> +static inline struct msi_chip *pci_msi_chip(struct pci_bus *bus)
> +{
> + struct pci_controller *ctrl = bus->sysdata;
> +
> + return ctrl->msi_chip;
> +}
> +
> extern struct pci_ops pci_root_ops;
>
> static inline int pci_proc_domain(struct pci_bus *bus)
> diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c
> index 8c3730c..401fc98 100644
> --- a/arch/ia64/kernel/msi_ia64.c
> +++ b/arch/ia64/kernel/msi_ia64.c
> @@ -112,15 +112,16 @@ static struct irq_chip ia64_msi_chip = {
> };
>
>
> -int arch_setup_msi_irq(struct pci_dev *pdev, struct msi_desc *desc)
> +static int arch_ia64_setup_msi_irq(struct msi_chip *chip,
> + struct pci_dev *dev, struct msi_desc *desc)
> {
> if (platform_setup_msi_irq)
> - return platform_setup_msi_irq(pdev, desc);
> + return platform_setup_msi_irq(dev, desc);
>
> - return ia64_setup_msi_irq(pdev, desc);
> + return ia64_setup_msi_irq(dev, desc);
Please don't make gratuitous changes ("pdev" -> "dev") at the same time,
especially since the rest of the file still uses "pdev".
> }
>
> -void arch_teardown_msi_irq(unsigned int irq)
> +static void arch_ia64_teardown_msi_irq(struct msi_chip *chip, unsigned int irq)
> {
> if (platform_teardown_msi_irq)
> return platform_teardown_msi_irq(irq);
> @@ -128,6 +129,11 @@ void arch_teardown_msi_irq(unsigned int irq)
> return ia64_teardown_msi_irq(irq);
> }
>
> +struct msi_chip chip = {
> + .setup_irq = arch_ia64_setup_msi_irq,
> + .teardown_irq = arch_ia64_teardown_msi_irq,
> +};
> +
> #ifdef CONFIG_INTEL_IOMMU
> #ifdef CONFIG_SMP
> static int dmar_msi_set_affinity(struct irq_data *data,
> diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
> index 291a582..299b67d 100644
> --- a/arch/ia64/pci/pci.c
> +++ b/arch/ia64/pci/pci.c
> @@ -437,6 +437,7 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
>
> controller->companion = device;
> controller->node = acpi_get_node(device->handle);
> + controller->msi_chip = &chip;
>
> info = kzalloc(sizeof(*info), GFP_KERNEL);
> if (!info) {
> --
> 1.7.1
>
> --
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