| Message ID | 1461761010-5452-4-git-send-email-xyjxie@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
On Wed, Apr 27, 2016 at 08:43:28PM +0800, Yongji Xie wrote: > On ARM HW the capability of IRQ remapping is abstracted on > MSI controller side. MSI_FLAG_IRQ_REMAPPING is used to advertise > this [1]. > > To have a universal flag to test this capability for different > archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses > when MSI_FLAG_IRQ_REMAPPING is set. > > [1] http://www.spinics.net/lists/kvm/msg130256.html > > Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com> > --- > drivers/pci/msi.c | 12 ++++++++++++ > drivers/pci/probe.c | 3 +++ > include/linux/msi.h | 6 +++++- > 3 files changed, 20 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c > index a080f44..1661cdf 100644 > --- a/drivers/pci/msi.c > +++ b/drivers/pci/msi.c > @@ -1134,6 +1134,18 @@ void *msi_desc_to_pci_sysdata(struct msi_desc *desc) > } > EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata); > > +void pci_bus_check_msi_remapping(struct pci_bus *bus, > + struct irq_domain *domain) > +{ > +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN > + struct msi_domain_info *info; > + > + info = msi_get_domain_info(domain); > + if (info->flags & MSI_FLAG_IRQ_REMAPPING) > + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; > +#endif > +} Functions named "check_foo" are a pet peeve of mine because the name doesn't tell us anything about what the function *does*. In this case, we know it checks something about MSI remapping, but we don't know whether we're checking whether it's enabled, disabled, or some other property. I'd prefer something like: int pci_bus_msi_isolated(struct pci_bus *bus, struct irq_domain *domain) { struct msi_domain_info *info; if (!domain) return 0; info = msi_get_domain_info(domain); if (info->flags & MSI_FLAG_IRQ_REMAPPING) return 1; return 0; } void pci_set_bus_msi_domain(struct pci_bus *bus) { ... if (b == bus && pci_bus_msi_isolated(bus, d)) bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; > #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN > /** > * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 6d7ab9b..25cf1b1 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -696,6 +696,9 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus) > if (!d) > d = pci_host_bridge_msi_domain(b); > > + if (d && b == bus) > + pci_bus_check_msi_remapping(bus, d); > + > dev_set_msi_domain(&bus->dev, d); > } > > diff --git a/include/linux/msi.h b/include/linux/msi.h > index 03eda72..b4c649e 100644 > --- a/include/linux/msi.h > +++ b/include/linux/msi.h > @@ -15,6 +15,8 @@ extern int pci_msi_ignore_mask; > struct irq_data; > struct msi_desc; > struct pci_dev; > +struct pci_bus; > +struct irq_domain; > struct platform_msi_priv_data; > void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg); > void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); > @@ -155,6 +157,9 @@ void arch_restore_msi_irqs(struct pci_dev *dev); > void default_teardown_msi_irqs(struct pci_dev *dev); > void default_restore_msi_irqs(struct pci_dev *dev); > > +void pci_bus_check_msi_remapping(struct pci_bus *bus, > + struct irq_domain *domain); > + > struct msi_controller { > struct module *owner; > struct device *dev; > @@ -173,7 +178,6 @@ struct msi_controller { > #include <linux/irqhandler.h> > #include <asm/msi.h> > > -struct irq_domain; > struct irq_domain_ops; > struct irq_chip; > struct device_node; > -- > 1.7.9.5 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pci" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2016/5/25 5:04, Bjorn Helgaas wrote: > On Wed, Apr 27, 2016 at 08:43:28PM +0800, Yongji Xie wrote: >> On ARM HW the capability of IRQ remapping is abstracted on >> MSI controller side. MSI_FLAG_IRQ_REMAPPING is used to advertise >> this [1]. >> >> To have a universal flag to test this capability for different >> archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses >> when MSI_FLAG_IRQ_REMAPPING is set. >> >> [1] http://www.spinics.net/lists/kvm/msg130256.html >> >> Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com> >> --- >> drivers/pci/msi.c | 12 ++++++++++++ >> drivers/pci/probe.c | 3 +++ >> include/linux/msi.h | 6 +++++- >> 3 files changed, 20 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c >> index a080f44..1661cdf 100644 >> --- a/drivers/pci/msi.c >> +++ b/drivers/pci/msi.c >> @@ -1134,6 +1134,18 @@ void *msi_desc_to_pci_sysdata(struct msi_desc *desc) >> } >> EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata); >> >> +void pci_bus_check_msi_remapping(struct pci_bus *bus, >> + struct irq_domain *domain) >> +{ >> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN >> + struct msi_domain_info *info; >> + >> + info = msi_get_domain_info(domain); >> + if (info->flags & MSI_FLAG_IRQ_REMAPPING) >> + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; >> +#endif >> +} > Functions named "check_foo" are a pet peeve of mine because the name > doesn't tell us anything about what the function *does*. In this > case, we know it checks something about MSI remapping, but we don't > know whether we're checking whether it's enabled, disabled, or some > other property. > > I'd prefer something like: > > int pci_bus_msi_isolated(struct pci_bus *bus, struct irq_domain *domain) > { > struct msi_domain_info *info; > > if (!domain) > return 0; > > info = msi_get_domain_info(domain); > if (info->flags & MSI_FLAG_IRQ_REMAPPING) > return 1; > > return 0; > } > > void pci_set_bus_msi_domain(struct pci_bus *bus) > { > ... > if (b == bus && pci_bus_msi_isolated(bus, d)) > bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; Yes. This looks more reasonable. Thank you! Regards, Yongji -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index a080f44..1661cdf 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -1134,6 +1134,18 @@ void *msi_desc_to_pci_sysdata(struct msi_desc *desc) } EXPORT_SYMBOL_GPL(msi_desc_to_pci_sysdata); +void pci_bus_check_msi_remapping(struct pci_bus *bus, + struct irq_domain *domain) +{ +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN + struct msi_domain_info *info; + + info = msi_get_domain_info(domain); + if (info->flags & MSI_FLAG_IRQ_REMAPPING) + bus->bus_flags |= PCI_BUS_FLAGS_MSI_REMAP; +#endif +} + #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN /** * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 6d7ab9b..25cf1b1 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -696,6 +696,9 @@ static void pci_set_bus_msi_domain(struct pci_bus *bus) if (!d) d = pci_host_bridge_msi_domain(b); + if (d && b == bus) + pci_bus_check_msi_remapping(bus, d); + dev_set_msi_domain(&bus->dev, d); } diff --git a/include/linux/msi.h b/include/linux/msi.h index 03eda72..b4c649e 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -15,6 +15,8 @@ extern int pci_msi_ignore_mask; struct irq_data; struct msi_desc; struct pci_dev; +struct pci_bus; +struct irq_domain; struct platform_msi_priv_data; void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg); void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg); @@ -155,6 +157,9 @@ void arch_restore_msi_irqs(struct pci_dev *dev); void default_teardown_msi_irqs(struct pci_dev *dev); void default_restore_msi_irqs(struct pci_dev *dev); +void pci_bus_check_msi_remapping(struct pci_bus *bus, + struct irq_domain *domain); + struct msi_controller { struct module *owner; struct device *dev; @@ -173,7 +178,6 @@ struct msi_controller { #include <linux/irqhandler.h> #include <asm/msi.h> -struct irq_domain; struct irq_domain_ops; struct irq_chip; struct device_node;
On ARM HW the capability of IRQ remapping is abstracted on MSI controller side. MSI_FLAG_IRQ_REMAPPING is used to advertise this [1]. To have a universal flag to test this capability for different archs on PCI side, we set PCI_BUS_FLAGS_MSI_REMAP for PCI buses when MSI_FLAG_IRQ_REMAPPING is set. [1] http://www.spinics.net/lists/kvm/msg130256.html Signed-off-by: Yongji Xie <xyjxie@linux.vnet.ibm.com> --- drivers/pci/msi.c | 12 ++++++++++++ drivers/pci/probe.c | 3 +++ include/linux/msi.h | 6 +++++- 3 files changed, 20 insertions(+), 1 deletion(-)