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[PATCH v10 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

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  [PATCH v10 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs jakeo@microsoft.com - 2015-12-10 19:00 +0100
    [PATCH v10 3/7] PCI: Make it possible to implement a PCI MSI IRQ Domain in a module. jakeo@microsoft.com - 2015-12-10 19:00 +0100
      Re: [PATCH v10 3/7] PCI: Make it possible to implement a PCI MSI  IRQ Domain in a module. Marc Zyngier <marc.zyngier@arm.com> - 2015-12-10 19:20 +0100
    [PATCH v10 4/7] PCI: Add fwnode_handle to pci_sysdata jakeo@microsoft.com - 2015-12-10 19:00 +0100
      Re: [PATCH v10 4/7] PCI: Add fwnode_handle to pci_sysdata Marc Zyngier <marc.zyngier@arm.com> - 2015-12-10 19:20 +0100
    [PATCH v10 1/7] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num jakeo@microsoft.com - 2015-12-10 19:00 +0100
    [PATCH v10 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle jakeo@microsoft.com - 2015-12-10 19:00 +0100
      Re: [PATCH v10 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle Marc Zyngier <marc.zyngier@arm.com> - 2015-12-10 19:20 +0100

#1288751 — [PATCH v10 0/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

From: Jake Oshins <jakeo@microsoft.com>

This version of the patch series removes warning when compiling x86
32-bit while still making it build cleanly for x64.

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 specific 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 tyhis into the kernel, which would pull
in a lot of other Hyper-V related code, as this IRQ domain depends on
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 exposes root PCI buses in
a Hyper-V VM.  These root PCI buses expose real PCIe device, 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 of 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     |    6 +
 arch/x86/include/asm/pci.h     |   15 +
 arch/x86/kernel/apic/msi.c     |    8 +-
 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 | 2249 ++++++++++++++++++++++++++++++++++++++++
 drivers/pci/msi.c              |    4 +
 drivers/pci/probe.c            |   15 +
 include/linux/hyperv.h         |   14 +
 include/linux/pci.h            |    4 +
 kernel/irq/chip.c              |    1 +
 kernel/irq/irqdomain.c         |    4 +
 17 files changed, 2356 insertions(+), 14 deletions(-)
 create mode 100644 drivers/pci/host/hv_pcifront.c

-- 
1.9.1

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#1288752 — [PATCH v10 3/7] PCI: Make it possible to implement a PCI MSI IRQ Domain in a module.

From: Jake Oshins <jakeo@microsoft.com>

The Linux kernel already has the concpet of IRQ domain, wherein a
component can expose a set of IRQs which are managed by a particular
interrupt controller chip or other subsystem. The PCI driver exposes
the notion of an IRQ domain for Message-Signaled Interrupts (MSI) from
PCI Express devices. This patch exposes the functions which are
necessary for making an MSI IRQ domain within a module.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 arch/x86/include/asm/msi.h    | 6 ++++++
 arch/x86/kernel/apic/msi.c    | 8 +++++---
 arch/x86/kernel/apic/vector.c | 2 ++
 drivers/pci/msi.c             | 4 ++++
 kernel/irq/chip.c             | 1 +
 kernel/irq/irqdomain.c        | 4 ++++
 6 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/msi.h b/arch/x86/include/asm/msi.h
index 93724cc..eb4b09b 100644
--- a/arch/x86/include/asm/msi.h
+++ b/arch/x86/include/asm/msi.h
@@ -1,7 +1,13 @@
 #ifndef _ASM_X86_MSI_H
 #define _ASM_X86_MSI_H
 #include <asm/hw_irq.h>
+#include <asm/irqdomain.h>
 
 typedef struct irq_alloc_info msi_alloc_info_t;
 
+int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
+		    msi_alloc_info_t *arg);
+
+void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc);
+
 #endif /* _ASM_X86_MSI_H */
diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 5f1feb6..ade2532 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -96,8 +96,8 @@ static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
 	return arg->msi_hwirq;
 }
 
-static int pci_msi_prepare(struct irq_domain *domain, struct device *dev,
-			   int nvec, msi_alloc_info_t *arg)
+int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
+		    msi_alloc_info_t *arg)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct msi_desc *desc = first_pci_msi_entry(pdev);
@@ -113,11 +113,13 @@ static int pci_msi_prepare(struct irq_domain *domain, struct device *dev,
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(pci_msi_prepare);
 
-static void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
+void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
 {
 	arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
 }
+EXPORT_SYMBOL_GPL(pci_msi_set_desc);
 
 static struct msi_domain_ops pci_msi_domain_ops = {
 	.get_hwirq	= pci_msi_get_hwirq,
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 861bc59..908cb37 100644
--- a/arch/x86/kernel/apic/vector.c
+++ b/arch/x86/kernel/apic/vector.c
@@ -29,6 +29,7 @@ struct apic_chip_data {
 };
 
 struct irq_domain *x86_vector_domain;
+EXPORT_SYMBOL_GPL(x86_vector_domain);
 static DEFINE_RAW_SPINLOCK(vector_lock);
 static cpumask_var_t vector_cpumask;
 static struct irq_chip lapic_controller;
@@ -66,6 +67,7 @@ struct irq_cfg *irqd_cfg(struct irq_data *irq_data)
 
 	return data ? &data->cfg : NULL;
 }
+EXPORT_SYMBOL_GPL(irqd_cfg);
 
 struct irq_cfg *irq_cfg(unsigned int irq)
 {
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 7eaa4c8..7a0df3f 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -257,6 +257,7 @@ void pci_msi_mask_irq(struct irq_data *data)
 {
 	msi_set_mask_bit(data, 1);
 }
+EXPORT_SYMBOL_GPL(pci_msi_mask_irq);
 
 /**
  * pci_msi_unmask_irq - Generic irq chip callback to unmask PCI/MSI interrupts
@@ -266,6 +267,7 @@ void pci_msi_unmask_irq(struct irq_data *data)
 {
 	msi_set_mask_bit(data, 0);
 }
+EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);
 
 void default_restore_msi_irqs(struct pci_dev *dev)
 {
@@ -1126,6 +1128,7 @@ struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
 {
 	return to_pci_dev(desc->dev);
 }
+EXPORT_SYMBOL(msi_desc_to_pci_dev);
 
 void *msi_desc_to_pci_sysdata(struct msi_desc *desc)
 {
@@ -1285,6 +1288,7 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 	domain->bus_token = DOMAIN_BUS_PCI_MSI;
 	return domain;
 }
+EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
 
 /**
  * pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 05e29de..5797909 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -950,6 +950,7 @@ void irq_chip_ack_parent(struct irq_data *data)
 	data = data->parent_data;
 	data->chip->irq_ack(data);
 }
+EXPORT_SYMBOL_GPL(irq_chip_ack_parent);
 
 /**
  * irq_chip_mask_parent - Mask the parent interrupt
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 22aa961..aa6ac44 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -60,6 +60,7 @@ struct fwnode_handle *irq_domain_alloc_fwnode(void *data)
 	fwid->fwnode.type = FWNODE_IRQCHIP;
 	return &fwid->fwnode;
 }
+EXPORT_SYMBOL_GPL(irq_domain_alloc_fwnode);
 
 /**
  * irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
@@ -77,6 +78,7 @@ void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
 	kfree(fwid->name);
 	kfree(fwid);
 }
+EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
 
 /**
  * __irq_domain_add() - Allocate a new irq_domain data structure
@@ -1013,6 +1015,7 @@ struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
 
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
 
 /**
  * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain
@@ -1343,6 +1346,7 @@ struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
 
 	return (irq_data && irq_data->domain == domain) ? irq_data : NULL;
 }
+EXPORT_SYMBOL_GPL(irq_domain_get_irq_data);
 
 /**
  * irq_domain_set_info - Set the complete data for a @virq in @domain
-- 
1.9.1

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#1288789 — Re: [PATCH v10 3/7] PCI: Make it possible to implement a PCI MSI IRQ Domain in a module.

On 10/12/15 17:52, jakeo@microsoft.com wrote:
> From: Jake Oshins <jakeo@microsoft.com>
> 
> The Linux kernel already has the concpet of IRQ domain, wherein a
> component can expose a set of IRQs which are managed by a particular
> interrupt controller chip or other subsystem. The PCI driver exposes
> the notion of an IRQ domain for Message-Signaled Interrupts (MSI) from
> PCI Express devices. This patch exposes the functions which are
> necessary for making an MSI IRQ domain within a module.
> 
> Signed-off-by: Jake Oshins <jakeo@microsoft.com>

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

	M.
-- 
Jazz is not dead. It just smells funny...
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#1288754 — [PATCH v10 4/7] PCI: Add fwnode_handle to pci_sysdata

From: Jake Oshins <jakeo@microsoft.com>

This patch adds an fwnode_handle to struct pci_sysdata, which is
used by the next patch in the series when trying to locate an
IRQ domain associated with a root PCI bus.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 arch/x86/include/asm/pci.h | 15 +++++++++++++++
 drivers/pci/probe.c        |  1 +
 include/linux/pci.h        |  4 ++++
 3 files changed, 20 insertions(+)

diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 4625943..6fc3c7c 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -20,6 +20,9 @@ struct pci_sysdata {
 #ifdef CONFIG_X86_64
 	void		*iommu;		/* IOMMU private data */
 #endif
+#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
+	void		*fwnode;	/* IRQ domain for MSI assignment */
+#endif
 };
 
 extern int pci_routeirq;
@@ -32,6 +35,7 @@ extern int noioapicreroute;
 static inline int pci_domain_nr(struct pci_bus *bus)
 {
 	struct pci_sysdata *sd = bus->sysdata;
+
 	return sd->domain;
 }
 
@@ -41,6 +45,17 @@ static inline int pci_proc_domain(struct pci_bus *bus)
 }
 #endif
 
+#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
+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
    already-configured bus numbers - to be used for buggy BIOSes
    or architectures with incomplete PCI setup by the loader */
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index edb1984..750f907 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -15,6 +15,7 @@
 #include <linux/pci-aspm.h>
 #include <linux/aer.h>
 #include <linux/acpi.h>
+#include <linux/irqdomain.h>
 #include <asm-generic/pci-bridge.h>
 #include "pci.h"
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6ae25aa..b414422 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1517,6 +1517,10 @@ static inline int pci_get_new_domain_nr(void) { return -ENOSYS; }
 
 #include <asm/pci.h>
 
+#ifndef pci_root_bus_fwnode
+#define pci_root_bus_fwnode(bus)	((void)(bus), NULL)
+#endif
+
 /* these helpers provide future and backwards compatibility
  * for accessing popular PCI BAR info */
 #define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)
-- 
1.9.1

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#1288775 — Re: [PATCH v10 4/7] PCI: Add fwnode_handle to pci_sysdata

On 10/12/15 17:53, jakeo@microsoft.com wrote:
> From: Jake Oshins <jakeo@microsoft.com>
> 
> This patch adds an fwnode_handle to struct pci_sysdata, which is
> used by the next patch in the series when trying to locate an
> IRQ domain associated with a root PCI bus.
> 
> Signed-off-by: Jake Oshins <jakeo@microsoft.com>
> ---
>  arch/x86/include/asm/pci.h | 15 +++++++++++++++
>  drivers/pci/probe.c        |  1 +
>  include/linux/pci.h        |  4 ++++
>  3 files changed, 20 insertions(+)
> 
> diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
> index 4625943..6fc3c7c 100644
> --- a/arch/x86/include/asm/pci.h
> +++ b/arch/x86/include/asm/pci.h
> @@ -20,6 +20,9 @@ struct pci_sysdata {
>  #ifdef CONFIG_X86_64
>  	void		*iommu;		/* IOMMU private data */
>  #endif
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +	void		*fwnode;	/* IRQ domain for MSI assignment */
> +#endif
>  };
>  
>  extern int pci_routeirq;
> @@ -32,6 +35,7 @@ extern int noioapicreroute;
>  static inline int pci_domain_nr(struct pci_bus *bus)
>  {
>  	struct pci_sysdata *sd = bus->sysdata;
> +
>  	return sd->domain;
>  }
>  
> @@ -41,6 +45,17 @@ static inline int pci_proc_domain(struct pci_bus *bus)
>  }
>  #endif
>  
> +#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
> +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
>     already-configured bus numbers - to be used for buggy BIOSes
>     or architectures with incomplete PCI setup by the loader */
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index edb1984..750f907 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -15,6 +15,7 @@
>  #include <linux/pci-aspm.h>
>  #include <linux/aer.h>
>  #include <linux/acpi.h>
> +#include <linux/irqdomain.h>

Nit: this should be with patch 5, but that doesn't hurt. I don't think
you need to respin the series for this.

>  #include <asm-generic/pci-bridge.h>
>  #include "pci.h"
>  
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 6ae25aa..b414422 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1517,6 +1517,10 @@ static inline int pci_get_new_domain_nr(void) { return -ENOSYS; }
>  
>  #include <asm/pci.h>
>  
> +#ifndef pci_root_bus_fwnode
> +#define pci_root_bus_fwnode(bus)	((void)(bus), NULL)
> +#endif
> +
>  /* these helpers provide future and backwards compatibility
>   * for accessing popular PCI BAR info */
>  #define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)
> 

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

	M.
-- 
Jazz is not dead. It just smells funny...
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#1288758 — [PATCH v10 1/7] drivers:hv: Export a function that maps Linux CPU num onto Hyper-V proc num

From: Jake Oshins <jakeo@microsoft.com>

This patch exposes the mapping between Linux CPU number and Hyper-V
virtual processor number. This is necessary because the hypervisor needs
to know which virtual processor to target when making a mapping in the
Interrupt Redirection Table in the I/O MMU.

Signed-off-by: Jake Oshins <jakeo@microsoft.com>
---
 drivers/hv/vmbus_drv.c | 17 +++++++++++++++++
 include/linux/hyperv.h |  2 ++
 2 files changed, 19 insertions(+)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index f19b6f7..c89d0e5 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1191,6 +1191,23 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
 }
 EXPORT_SYMBOL_GPL(vmbus_allocate_mmio);
 
+/**
+ * vmbus_cpu_number_to_vp_number() - Map CPU to VP.
+ * @cpu_number: CPU number in Linux terms
+ *
+ * This function returns the mapping between the Linux processor
+ * number and the hypervisor's virtual processor number, useful
+ * in making hypercalls and such that talk about specific
+ * processors.
+ *
+ * Return: Virtual processor number in Hyper-V terms
+ */
+int vmbus_cpu_number_to_vp_number(int cpu_number)
+{
+	return hv_context.vp_index[cpu_number];
+}
+EXPORT_SYMBOL_GPL(vmbus_cpu_number_to_vp_number);
+
 static int vmbus_acpi_add(struct acpi_device *device)
 {
 	acpi_status result;
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 8fdc17b..fddb3e0 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -983,6 +983,8 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj,
 			resource_size_t size, resource_size_t align,
 			bool fb_overlap_ok);
 
+int vmbus_cpu_number_to_vp_number(int cpu_number);
+
 /**
  * VMBUS_DEVICE - macro used to describe a specific hyperv vmbus device
  *
-- 
1.9.1

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#1288759 — [PATCH v10 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

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>
---
 drivers/pci/probe.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 750f907..c6369dd 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -674,6 +674,20 @@ 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) {
+		struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
+
+		if (fwnode)
+			d = irq_find_matching_fwnode(fwnode,
+						     DOMAIN_BUS_PCI_MSI);
+	}
+#endif
+
 	return d;
 }
 
-- 
1.9.1

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#1288777 — Re: [PATCH v10 5/7] PCI: irqdomain: Look up IRQ domain by fwnode_handle

On 10/12/15 17:53, 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>
> ---
>  drivers/pci/probe.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 750f907..c6369dd 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -674,6 +674,20 @@ 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) {
> +		struct fwnode_handle *fwnode = pci_root_bus_fwnode(bus);
> +
> +		if (fwnode)
> +			d = irq_find_matching_fwnode(fwnode,
> +						     DOMAIN_BUS_PCI_MSI);
> +	}
> +#endif
> +
>  	return d;
>  }
>  
> 

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>

	M.
-- 
Jazz is not dead. It just smells funny...
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