linux-kernel - Re: [PATCH v14 13/18] irqchip/riscv-imsic: Add device MSI domain support for PCI devices

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Date: Thu, 22 Feb 2024 19:00:25 +0530
From: Anup Patel <anup@...infault.org>
To: Björn Töpel <bjorn@...nel.org>
Cc: Anup Patel <apatel@...tanamicro.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Frank Rowand <frowand.list@...il.com>, 
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org, 
	Saravana Kannan <saravanak@...gle.com>, Marc Zyngier <maz@...nel.org>, linux-kernel@...r.kernel.org, 
	Atish Patra <atishp@...shpatra.org>, linux-riscv@...ts.infradead.org, 
	linux-arm-kernel@...ts.infradead.org, Andrew Jones <ajones@...tanamicro.com>
Subject: Re: [PATCH v14 13/18] irqchip/riscv-imsic: Add device MSI domain
 support for PCI devices

On Thu, Feb 22, 2024 at 6:44 PM Björn Töpel <bjorn@...nelorg> wrote:
>
> Anup Patel <apatel@...tanamicro.com> writes:
>
> > The Linux PCI framework supports per-device MSI domains for PCI devices
> > so extend the IMSIC driver to allow PCI per-device MSI domains.
> >
> > Signed-off-by: Anup Patel <apatel@...tanamicro.com>
> > ---
> >  drivers/irqchip/Kconfig                    |  7 +++++
> >  drivers/irqchip/irq-riscv-imsic-platform.c | 35 ++++++++++++++++++++--
> >  2 files changed, 40 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> > index 85f86e31c996..2fc0cb32341a 100644
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -553,6 +553,13 @@ config RISCV_IMSIC
> >       select GENERIC_IRQ_MATRIX_ALLOCATOR
> >       select GENERIC_MSI_IRQ
> >
> > +config RISCV_IMSIC_PCI
> > +     bool
> > +     depends on RISCV_IMSIC
> > +     depends on PCI
> > +     depends on PCI_MSI
> > +     default RISCV_IMSIC
> > +
> >  config EXYNOS_IRQ_COMBINER
> >       bool "Samsung Exynos IRQ combiner support" if COMPILE_TEST
> >       depends on (ARCH_EXYNOS && ARM) || COMPILE_TEST
> > diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
> > index e2344fc08dca..90ddcdd0bba5 100644
> > --- a/drivers/irqchip/irq-riscv-imsic-platform.c
> > +++ b/drivers/irqchip/irq-riscv-imsic-platform.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/irqdomain.h>
> >  #include <linux/module.h>
> >  #include <linux/msi.h>
> > +#include <linux/pci.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/spinlock.h>
> >  #include <linux/smp.h>
> > @@ -208,6 +209,28 @@ static const struct irq_domain_ops imsic_base_domain_ops = {
> >  #endif
> >  };
> >
> > +#ifdef CONFIG_RISCV_IMSIC_PCI
> > +
> > +static void imsic_pci_mask_irq(struct irq_data *d)
> > +{
> > +     pci_msi_mask_irq(d);
> > +     irq_chip_mask_parent(d);
> > +}
> > +
> > +static void imsic_pci_unmask_irq(struct irq_data *d)
> > +{
> > +     irq_chip_unmask_parent(d);
> > +     pci_msi_unmask_irq(d);
> > +}
> > +
> > +#define MATCH_PCI_MSI                BIT(DOMAIN_BUS_PCI_MSI)
> > +
> > +#else
> > +
> > +#define MATCH_PCI_MSI                0
> > +
> > +#endif
> > +
> >  static bool imsic_init_dev_msi_info(struct device *dev,
> >                                   struct irq_domain *domain,
> >                                   struct irq_domain *real_parent,
> > @@ -231,6 +254,13 @@ static bool imsic_init_dev_msi_info(struct device *dev,
> >
> >       /* Is the target supported? */
> >       switch (info->bus_token) {
> > +#ifdef CONFIG_RISCV_IMSIC_PCI
> > +     case DOMAIN_BUS_PCI_DEVICE_MSI:
> > +     case DOMAIN_BUS_PCI_DEVICE_MSIX:
> > +             info->chip->irq_mask = imsic_pci_mask_irq;
> > +             info->chip->irq_unmask = imsic_pci_unmask_irq;
>
> irq_set_affinity()?

It's already set by the switch-case above.

Regards,
Anup