From: Bjorn Helgaas <helgaas@kernel.org>
To: Yongji Xie <xyjxie@linux.vnet.ibm.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pci@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
iommu@lists.linux-foundation.org, alex.williamson@redhat.com,
bhelgaas@google.com, aik@ozlabs.ru, benh@kernel.crashing.org,
paulus@samba.org, mpe@ellerman.id.au, joro@8bytes.org,
warrier@linux.vnet.ibm.com, zhong@linux.vnet.ibm.com,
nikunj@linux.vnet.ibm.com, eric.auger@linaro.org,
will.deacon@arm.com, gwshan@linux.vnet.ibm.com,
David.Laight@ACULAB.COM, alistair@popple.id.au,
ruscur@russell.cc
Subject: Re: [PATCH 3/5] PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller supports IRQ remapping
Date: Tue, 24 May 2016 16:04:34 -0500 [thread overview]
Message-ID: <20160524210434.GB16463@localhost> (raw)
In-Reply-To: <1461761010-5452-4-git-send-email-xyjxie@linux.vnet.ibm.com>
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
next prev parent reply other threads:[~2016-05-24 21:04 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-27 12:43 [PATCH 0/5] vfio-pci: Add support for mmapping MSI-X table Yongji Xie
2016-04-27 12:43 ` [PATCH 1/5] PCI: Add a new PCI_BUS_FLAGS_MSI_REMAP flag Yongji Xie
2016-05-24 20:55 ` Bjorn Helgaas
2016-05-25 5:46 ` Yongji Xie
2016-04-27 12:43 ` [PATCH 2/5] iommu: Set PCI_BUS_FLAGS_MSI_REMAP if IOMMU have capability of IRQ remapping Yongji Xie
2016-05-24 21:11 ` Bjorn Helgaas
2016-05-25 5:54 ` Yongji Xie
[not found] ` <201605250554.u4P5sRqv014439@mx0a-001b2d01.pphosted.com>
2016-05-26 3:48 ` Bjorn Helgaas
2016-04-27 12:43 ` [PATCH 3/5] PCI: Set PCI_BUS_FLAGS_MSI_REMAP if MSI controller supports " Yongji Xie
2016-05-24 21:04 ` Bjorn Helgaas [this message]
2016-05-25 5:48 ` Yongji Xie
2016-04-27 12:43 ` [PATCH 4/5] pci-ioda: Set PCI_BUS_FLAGS_MSI_REMAP for IODA host bridge Yongji Xie
2016-05-06 6:34 ` Alexey Kardashevskiy
2016-04-27 12:43 ` [PATCH 5/5] vfio-pci: Allow to mmap MSI-X table if interrupt remapping is supported Yongji Xie
2016-05-03 5:34 ` Tian, Kevin
2016-05-03 6:08 ` Yongji Xie
2016-05-03 6:22 ` Tian, Kevin
2016-05-03 7:34 ` Yongji Xie
2016-05-05 9:36 ` Tian, Kevin
2016-05-05 9:54 ` David Laight
2016-05-05 11:42 ` Yongji Xie
2016-05-05 12:15 ` Tian, Kevin
2016-05-05 13:28 ` Yongji Xie
2016-05-05 15:05 ` Alex Williamson
2016-05-06 6:35 ` Alexey Kardashevskiy
2016-05-06 16:54 ` Alex Williamson
2016-05-11 6:29 ` Tian, Kevin
2016-05-11 15:53 ` Alex Williamson
2016-05-12 1:19 ` Tian, Kevin
2016-05-12 2:20 ` Alex Williamson
2016-05-12 4:53 ` Tian, Kevin
2016-05-12 17:47 ` Alex Williamson
2016-05-13 2:33 ` Tian, Kevin
2016-05-13 5:32 ` Alex Williamson
2016-05-13 6:50 ` Tian, Kevin
2016-05-13 16:42 ` Alex Williamson
2016-05-13 9:16 ` David Laight
2016-05-13 2:36 ` Tian, Kevin
2016-05-05 11:44 ` Yongji Xie
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