Re: [patch V2 17/23] PCI/MSI: Split out !IRQDOMAIN code

Bjorn Helgaas
2021-12-07T21:00:07Z

On Mon, Dec 06, 2021 at 11:27:51PM +0100, Thomas Gleixner wrote:
> Split out the non irqdomain code into its own file.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Tested-by: Juergen Gross <jgross@suse.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.com>

> ---
> V2: Add proper includes and fix variable name - Cedric
> ---
> drivers/pci/msi/Makefile | 5 ++--
> drivers/pci/msi/legacy.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++
> drivers/pci/msi/msi.c | 46 -----------------------------------------
> 3 files changed, 55 insertions(+), 48 deletions(-)
>
> --- a/drivers/pci/msi/Makefile
> +++ b/drivers/pci/msi/Makefile
> @@ -1,5 +1,6 @@
> # SPDX-License-Identifier: GPL-2.0
> #
> # Makefile for the PCI/MSI
> -obj-$(CONFIG_PCI) += pcidev_msi.o
> -obj-$(CONFIG_PCI_MSI) += msi.o
> +obj-$(CONFIG_PCI) += pcidev_msi.o
> +obj-$(CONFIG_PCI_MSI) += msi.o
> +obj-$(CONFIG_PCI_MSI_ARCH_FALLBACKS) += legacy.o
> --- /dev/null
> +++ b/drivers/pci/msi/legacy.c
> @@ -0,0 +1,52 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCI Message Signaled Interrupt (MSI).
> + *
> + * Legacy architecture specific setup and teardown mechanism.
> + */
> +#include <linux/msi.h>
> +#include <linux/pci.h>
> +
> +/* Arch hooks */
> +int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
> +{
> + return -EINVAL;
> +}
> +
> +void __weak arch_teardown_msi_irq(unsigned int irq)
> +{
> +}
> +
> +int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> +{
> + struct msi_desc *desc;
> + int ret;
> +
> + /*
> + * If an architecture wants to support multiple MSI, it needs to
> + * override arch_setup_msi_irqs()
> + */
> + if (type == PCI_CAP_ID_MSI && nvec > 1)
> + return 1;
> +
> + for_each_pci_msi_entry(desc, dev) {
> + ret = arch_setup_msi_irq(dev, desc);
> + if (ret)
> + return ret < 0 ? ret : -ENOSPC;
> + }
> +
> + return 0;
> +}
> +
> +void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
> +{
> + struct msi_desc *desc;
> + int i;
> +
> + for_each_pci_msi_entry(desc, dev) {
> + if (desc->irq) {
> + for (i = 0; i < desc->nvec_used; i++)
> + arch_teardown_msi_irq(desc->irq + i);
> + }
> + }
> +}
> --- a/drivers/pci/msi/msi.c
> +++ b/drivers/pci/msi/msi.c
> @@ -50,52 +50,6 @@ static void pci_msi_teardown_msi_irqs(st
> #define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
> #endif
>
> -#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
> -/* Arch hooks */
> -int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
> -{
> - return -EINVAL;
> -}
> -
> -void __weak arch_teardown_msi_irq(unsigned int irq)
> -{
> -}
> -
> -int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
> -{
> - struct msi_desc *entry;
> - int ret;
> -
> - /*
> - * If an architecture wants to support multiple MSI, it needs to
> - * override arch_setup_msi_irqs()
> - */
> - if (type == PCI_CAP_ID_MSI && nvec > 1)
> - return 1;
> -
> - for_each_pci_msi_entry(entry, dev) {
> - ret = arch_setup_msi_irq(dev, entry);
> - if (ret < 0)
> - return ret;
> - if (ret > 0)
> - return -ENOSPC;
> - }
> -
> - return 0;
> -}
> -
> -void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
> -{
> - int i;
> - struct msi_desc *entry;
> -
> - for_each_pci_msi_entry(entry, dev)
> - if (entry->irq)
> - for (i = 0; i < entry->nvec_used; i++)
> - arch_teardown_msi_irq(entry->irq + i);
> -}
> -#endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
> -
> /*
> * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
> * mask all MSI interrupts by clearing the MSI enable bit does not work
>