The Linux PCI framework supports per-device MSI domains for PCI devices
so let us extend the IMSIC driver to allow per-device MSI domains for
PCI devices.
Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
---
drivers/irqchip/Kconfig | 7 +++++
drivers/irqchip/irq-riscv-imsic-platform.c | 36 ++++++++++++++++++++--
2 files changed, 41 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 85f86e31c996..2fc0cb32341a 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -553,6 +553,13 @@ config RISCV_IMSIC
select GENERIC_IRQ_MATRIX_ALLOCATOR
select GENERIC_MSI_IRQ
+config RISCV_IMSIC_PCI
+ bool
+ depends on RISCV_IMSIC
+ depends on PCI
+ depends on PCI_MSI
+ default RISCV_IMSIC
+
config EXYNOS_IRQ_COMBINER
bool "Samsung Exynos IRQ combiner support" if COMPILE_TEST
depends on (ARCH_EXYNOS && ARM) || COMPILE_TEST
diff --git a/drivers/irqchip/irq-riscv-imsic-platform.c b/drivers/irqchip/irq-riscv-imsic-platform.c
index 65791a6b0727..d78c93e2cf2b 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -14,6 +14,7 @@
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/msi.h>
+#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/smp.h>
@@ -233,6 +234,28 @@ static const struct irq_domain_ops imsic_base_domain_ops = {
#endif
};
+#ifdef CONFIG_RISCV_IMSIC_PCI
+
+static void imsic_pci_mask_irq(struct irq_data *d)
+{
+ pci_msi_mask_irq(d);
+ irq_chip_mask_parent(d);
+}
+
+static void imsic_pci_unmask_irq(struct irq_data *d)
+{
+ pci_msi_unmask_irq(d);
+ irq_chip_unmask_parent(d);
+}
+
+#define MATCH_PCI_MSI BIT(DOMAIN_BUS_PCI_MSI)
+
+#else
+
+#define MATCH_PCI_MSI 0
+
+#endif
+
static bool imsic_init_dev_msi_info(struct device *dev,
struct irq_domain *domain,
struct irq_domain *real_parent,
@@ -242,6 +265,7 @@ static bool imsic_init_dev_msi_info(struct device *dev,
/* MSI parent domain specific settings */
switch (real_parent->bus_token) {
+ case DOMAIN_BUS_PCI_MSI:
case DOMAIN_BUS_NEXUS:
if (WARN_ON_ONCE(domain != real_parent))
return false;
@@ -256,6 +280,13 @@ static bool imsic_init_dev_msi_info(struct device *dev,
/* Is the target supported? */
switch (info->bus_token) {
+#ifdef CONFIG_RISCV_IMSIC_PCI
+ case DOMAIN_BUS_PCI_DEVICE_MSI:
+ case DOMAIN_BUS_PCI_DEVICE_MSIX:
+ info->chip->irq_mask = imsic_pci_mask_irq;
+ info->chip->irq_unmask = imsic_pci_unmask_irq;
+ break;
+#endif
case DOMAIN_BUS_DEVICE_IMS:
/*
* Per device IMS should never have any MSI feature bits
@@ -295,11 +326,12 @@ static bool imsic_init_dev_msi_info(struct device *dev,
#define MATCH_PLATFORM_MSI BIT(DOMAIN_BUS_PLATFORM_MSI)
static const struct msi_parent_ops imsic_msi_parent_ops = {
- .supported_flags = MSI_GENERIC_FLAGS_MASK,
+ .supported_flags = MSI_GENERIC_FLAGS_MASK |
+ MSI_FLAG_PCI_MSIX,
.required_flags = MSI_FLAG_USE_DEF_DOM_OPS |
MSI_FLAG_USE_DEF_CHIP_OPS,
.bus_select_token = DOMAIN_BUS_NEXUS,
- .bus_select_mask = MATCH_PLATFORM_MSI,
+ .bus_select_mask = MATCH_PCI_MSI | MATCH_PLATFORM_MSI,
.init_dev_msi_info = imsic_init_dev_msi_info,
};
--
2.34.1
