From: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
This patch introduces pci_host_bridge_acpi_msi_domain(), which queries
a GIC MSI irq-domain token and use it to retrieve an irq_domain with
DOMAIN_BUS_PCI_MSI bus type, and bind it to PCI host-bridge.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
Signed-off-by: Hanjun Guo <hanjun....@linaro.org>
---
drivers/pci/pci-acpi.c | 18 ++++++++++++++++++
drivers/pci/probe.c | 3 +++
include/linux/pci-acpi.h | 4 ++++
3 files changed, 25 insertions(+)
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 314a625..5f11653 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -9,6 +9,7 @@
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/irqdomain.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/module.h>
@@ -16,6 +17,7 @@
#include <linux/pci-acpi.h>
#include <linux/pm_runtime.h>
#include <linux/pm_qos.h>
+#include <acpi/acpi_gic.h>
#include "pci.h"
/*
@@ -681,6 +683,22 @@ static bool pci_acpi_bus_match(struct device *dev)
return dev_is_pci(dev);
}
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus)
+{
+ struct irq_domain *d = NULL;
+ void *token = acpi_gic_get_msi_token(&bus->dev);
+
+ if (token)
+ d = irq_find_matching_host(token, DOMAIN_BUS_PCI_MSI);
+
+ if (!d)
+ pr_debug("Fail to find domain for MSI\n");
+
+ return d;
+}
+#endif /*CONFIG_GENERIC_MSI_IRQ_DOMAIN*/
+
static struct acpi_bus_type acpi_pci_bus = {
.name = "PCI",
.match = pci_acpi_bus_match,
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index a7afeac..8c1204c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/cpumask.h>
#include <linux/pci-aspm.h>
+#include <linux/pci-acpi.h>
#include <asm-generic/pci-bridge.h>
#include "pci.h"
@@ -670,6 +671,8 @@ static struct irq_domain *pci_host_bridge_msi_domain(struct
pci_bus *bus)
* should be called from here.
*/
d = pci_host_bridge_of_msi_domain(bus);
+ if (!d)
+ d = pci_host_bridge_acpi_msi_domain(bus);
return d;
}
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index a965efa..766d045 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -77,6 +77,8 @@ static inline void acpiphp_remove_slots(struct pci_bus *bus)
{ }
static inline void acpiphp_check_host_bridge(struct acpi_device *adev) { }
#endif
+struct irq_domain *pci_host_bridge_acpi_msi_domain(struct pci_bus *bus);
+
extern const u8 pci_acpi_dsm_uuid[];
#define DEVICE_LABEL_DSM 0x07
#define RESET_DELAY_DSM 0x08
@@ -85,6 +87,8 @@ extern const u8 pci_acpi_dsm_uuid[];
#else /* CONFIG_ACPI */
static inline void acpi_pci_add_bus(struct pci_bus *bus) { }
static inline void acpi_pci_remove_bus(struct pci_bus *bus) { }
+static inline struct irq_domain *
+pci_host_bridge_acpi_msi_domain(struct pci_bus *bus) { return NULL; }
#endif /* CONFIG_ACPI */
#ifdef CONFIG_ACPI_APEI
--
1.9.1
--
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