Messages in this thread | | | Subject | Re: [PATCH 3/5] PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller supports IRQ remapping | From | Yongji Xie <> | Date | Wed, 25 May 2016 13:48:00 +0800 |
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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
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