[PATCH v14 13/18] irqchip/riscv-imsic: Add device MSI domain support for PCI devices

Anup Patel
2024-02-22T09:42:01Z

The Linux PCI framework supports per-device MSI domains for PCI devices
so extend the IMSIC driver to allow PCI per-device MSI domains.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
drivers/irqchip/Kconfig | 7 +++++
drivers/irqchip/irq-riscv-imsic-platform.c | 35 ++++++++++++++++++++--
2 files changed, 40 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 e2344fc08dca..90ddcdd0bba5 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>
@@ -208,6 +209,28 @@ 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)
+{
+ irq_chip_unmask_parent(d);
+ pci_msi_unmask_irq(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,
@@ -231,6 +254,13 @@ 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_MSI:
/*
* Per-device MSI should never have any MSI feature bits
@@ -270,11 +300,12 @@ 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