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[PATCH v5 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

Started byjakeo@microsoft.com
First post2015-10-30 22:20 +0100
Last post2015-10-31 23:10 +0100
Articles 4 — 3 participants

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  [PATCH v5 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs jakeo@microsoft.com - 2015-10-30 22:20 +0100
    [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle jakeo@microsoft.com - 2015-10-30 22:20 +0100
      Re: [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-10-30 22:50 +0100
        RE: [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by  fwnode_handle Jake Oshins <jakeo@microsoft.com> - 2015-10-31 23:10 +0100

#1259800 — [PATCH v5 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

Fromjakeo@microsoft.com
Date2015-10-30 22:20 +0100
Subject[PATCH v5 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs
Message-ID<qppfz-2sf-7@gated-at.bofh.it>
From: Jake Oshins <jakeo@microsoft.com>

This patch series incorporates feedback related to the version sent yesterday.

First, export functions that allow correlating Hyper-V virtual processors
and Linux cpus, along with the means for invoking a hypercall that targets
interrupts at chosen vectors on specfic cpus.

Second, mark various parts of IRQ domain related code as exported, so that
this PCI front-end can implement an IRQ domain as part of a module.  (The
alternative would be to pull all this into the kernel, which would pull
in a lot of other Hyper-V related code, as this IRQ domain depends on
hv_vmbus.ko.)

Third, modify PCI so that new root PCI buses can be marked with an associated
fwnode_handle, and so that root PCI buses can look up their associated IRQ
domain by that handle.

Fourth, introduce a new driver, hv_pcifront, which eposes root PCI buses in
a Hyper-V VM.  These root PCI buses expose real PCIe devices, or PCI Virtual
Functions.

Jake Oshins (7):
  drivers:hv: Export a function that maps Linux CPU num onto Hyper-V
    proc num
  drivers:hv: Export hv_do_hypercall()
  PCI: Make it possible to implement a PCI MSI IRQ Domain in a module.
  PCI: Add fwnode_handle to pci_sysdata
  PCI: irqdomain: Look up IRQ domain by fwnode_handle
  drivers:hv: Define the channel type for Hyper-V PCI Express
    pass-through
  PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

 MAINTAINERS                    |    1 +
 arch/x86/include/asm/msi.h     |    4 +
 arch/x86/include/asm/pci.h     |   13 +
 arch/x86/kernel/apic/msi.c     |    5 +-
 arch/x86/kernel/apic/vector.c  |    2 +
 drivers/hv/hv.c                |   20 +-
 drivers/hv/hyperv_vmbus.h      |    2 +-
 drivers/hv/vmbus_drv.c         |   17 +
 drivers/pci/Kconfig            |    7 +
 drivers/pci/host/Makefile      |    1 +
 drivers/pci/host/hv_pcifront.c | 2267 ++++++++++++++++++++++++++++++++++++++++
 drivers/pci/msi.c              |    4 +
 drivers/pci/probe.c            |   11 +
 include/asm-generic/pci.h      |    4 +
 include/linux/hyperv.h         |   14 +
 kernel/irq/chip.c              |    1 +
 kernel/irq/irqdomain.c         |    2 +
 17 files changed, 2362 insertions(+), 13 deletions(-)
 create mode 100644 drivers/pci/host/hv_pcifront.c

-- 
1.9.1

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#1259801 — [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

Fromjakeo@microsoft.com
Date2015-10-30 22:20 +0100
Subject[PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle
Message-ID<qppfA-2sf-29@gated-at.bofh.it>
In reply to#1259800
From: Jake Oshins <jakeo@microsoft.com>

This patch adds a second way of finding an IRQ domain associated with
a root PCI bus.  After looking to see if one can be found through
the OF tree, it attempts to look up the IRQ domain through an
fwnode_handle stored in the pci_sysdata struct.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 arch/x86/include/asm/pci.h |  4 +++-
 drivers/pci/probe.c        | 11 +++++++++++
 include/asm-generic/pci.h  |  4 ++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 10213a1..fb74453 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -45,11 +45,13 @@ static inline int pci_proc_domain(struct pci_bus *bus)
 #endif
 
 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-static inline void *pci_fwnode(struct pci_bus *bus)
+static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)
 {
 	struct pci_sysdata *sd = bus->sysdata;
 	return sd->fwnode;
 }
+
+#define pci_root_bus_fwnode	_pci_root_bus_fwnode
 #endif
 
 /* Can be used to override the logic in pci_scan_bus for skipping
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f441d1b..60e50a8 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -671,6 +671,17 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
 	 */
 	d = pci_host_bridge_of_msi_domain(bus);
 
+#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
+	/*
+	 * If no IRQ domain was found via the OF tree, try looking it up
+	 * directly through the fwnode_handle.
+	 */
+	if (!d && pci_root_bus_fwnode(bus)) {
+		d = irq_find_matching_fwnode(pci_root_bus_fwnode(bus),
+					     DOMAIN_BUS_PCI_MSI);
+	}
+#endif
+
 	return d;
 }
 
diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
index f24bc51..3fde985 100644
--- a/include/asm-generic/pci.h
+++ b/include/asm-generic/pci.h
@@ -21,4 +21,8 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 #define PCI_DMA_BUS_IS_PHYS	(1)
 #endif
 
+#ifndef pci_root_bus_fwnode
+#define pci_root_bus_fwnode(bus)	((void)(bus),NULL)
+#endif
+
 #endif /* _ASM_GENERIC_PCI_H */
-- 
1.9.1

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#1259810 — Re: [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

FromAndy Shevchenko <andy.shevchenko@gmail.com>
Date2015-10-30 22:50 +0100
SubjectRe: [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle
Message-ID<qppIC-2BU-9@gated-at.bofh.it>
In reply to#1259801
On Fri, Oct 30, 2015 at 11:11 PM,  <jakeo@microsoft.com> wrote:
> From: Jake Oshins <jakeo@microsoft.com>
>
> This patch adds a second way of finding an IRQ domain associated with
> a root PCI bus.  After looking to see if one can be found through
> the OF tree, it attempts to look up the IRQ domain through an
> fwnode_handle stored in the pci_sysdata struct.
>
> Signed-off-by: Jake Oshins <jakeo@microsoft.com>
> ---
>  arch/x86/include/asm/pci.h |  4 +++-
>  drivers/pci/probe.c        | 11 +++++++++++
>  include/asm-generic/pci.h  |  4 ++++
>  3 files changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 10213a1..fb74453 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -45,11 +45,13 @@ static inline int pci_proc_domain(struct pci_bus *bus)
>  #endif
>
>  #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> -static inline void *pci_fwnode(struct pci_bus *bus)
> +static inline void *_pci_root_bus_fwnode(struct pci_bus *bus)

I'm sorry what is the point to rename?

>  {
>         struct pci_sysdata *sd = bus->sysdata;
>         return sd->fwnode;
>  }
> +
> +#define pci_root_bus_fwnode    _pci_root_bus_fwnode
>  #endif
>
>  /* Can be used to override the logic in pci_scan_bus for skipping
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index f441d1b..60e50a8 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -671,6 +671,17 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct pci_bus *bus)
>          */
>         d = pci_host_bridge_of_msi_domain(bus);
>
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +       /*
> +        * If no IRQ domain was found via the OF tree, try looking it up
> +        * directly through the fwnode_handle.
> +        */
> +       if (!d && pci_root_bus_fwnode(bus)) {
> +               d = irq_find_matching_fwnode(pci_root_bus_fwnode(bus),
> +                                            DOMAIN_BUS_PCI_MSI);

Gave a second glance and now noticed that you call
pci_root_bus_fwnode() twice. So, it actually might be more readable
like your first but modified variant:

if (!d) {
  void *fwnode = pci_fwnode(bus);

  if (fwnode)
    d = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_PCI_MSI);
}

> +       }
> +#endif
> +
>         return d;
>  }


With Best Regards,
Andy Shevchenko
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#1260060 — RE: [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

FromJake Oshins <jakeo@microsoft.com>
Date2015-10-31 23:10 +0100
SubjectRE: [PATCH v5 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle
Message-ID<qpMvw-8rH-13@gated-at.bofh.it>
In reply to#1259810
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