[PATCH v11 09/14] irqchip/riscv-imsic: Add support for PCI MSI irqdomain
Anup Patel
apatel at ventanamicro.com
Mon Oct 23 10:27:55 PDT 2023
The Linux PCI framework requires it's own dedicated MSI irqdomain so
let us create PCI MSI irqdomain as child of the IMSIC base irqdomain.
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
drivers/irqchip/Kconfig | 7 +++
drivers/irqchip/irq-riscv-imsic-platform.c | 51 ++++++++++++++++++++++
drivers/irqchip/irq-riscv-imsic-state.h | 1 +
3 files changed, 59 insertions(+)
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index bdd80716114d..c1d69b418dfb 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -552,6 +552,13 @@ config RISCV_IMSIC
select IRQ_DOMAIN_HIERARCHY
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 23d286cb017e..cdb659401199 100644
--- a/drivers/irqchip/irq-riscv-imsic-platform.c
+++ b/drivers/irqchip/irq-riscv-imsic-platform.c
@@ -13,6 +13,7 @@
#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>
@@ -215,6 +216,42 @@ 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);
+}
+
+static struct irq_chip imsic_pci_irq_chip = {
+ .name = "IMSIC-PCI",
+ .irq_mask = imsic_pci_mask_irq,
+ .irq_unmask = imsic_pci_unmask_irq,
+#ifdef CONFIG_SMP
+ .irq_set_affinity = imsic_irq_set_affinity,
+#endif
+ .irq_eoi = irq_chip_eoi_parent,
+};
+
+static struct msi_domain_ops imsic_pci_domain_ops = {
+};
+
+static struct msi_domain_info imsic_pci_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX | MSI_FLAG_MULTI_PCI_MSI),
+ .ops = &imsic_pci_domain_ops,
+ .chip = &imsic_pci_irq_chip,
+};
+
+#endif
+
static struct irq_chip imsic_plat_irq_chip = {
.name = "IMSIC-PLAT",
#ifdef CONFIG_SMP
@@ -243,6 +280,18 @@ static int imsic_irq_domains_init(struct fwnode_handle *fwnode)
}
irq_domain_update_bus_token(imsic->base_domain, DOMAIN_BUS_NEXUS);
+#ifdef CONFIG_RISCV_IMSIC_PCI
+ /* Create PCI MSI domain */
+ imsic->pci_domain = pci_msi_create_irq_domain(fwnode,
+ &imsic_pci_domain_info,
+ imsic->base_domain);
+ if (!imsic->pci_domain) {
+ pr_err("%pfwP: failed to create IMSIC PCI domain\n", fwnode);
+ irq_domain_remove(imsic->base_domain);
+ return -ENOMEM;
+ }
+#endif
+
/* Create Platform MSI domain */
imsic->plat_domain = platform_msi_create_irq_domain(fwnode,
&imsic_plat_domain_info,
@@ -250,6 +299,8 @@ static int imsic_irq_domains_init(struct fwnode_handle *fwnode)
if (!imsic->plat_domain) {
pr_err("%pfwP: failed to create IMSIC platform domain\n",
fwnode);
+ if (imsic->pci_domain)
+ irq_domain_remove(imsic->pci_domain);
irq_domain_remove(imsic->base_domain);
return -ENOMEM;
}
diff --git a/drivers/irqchip/irq-riscv-imsic-state.h b/drivers/irqchip/irq-riscv-imsic-state.h
index 82911b8b08b4..8d209e77432e 100644
--- a/drivers/irqchip/irq-riscv-imsic-state.h
+++ b/drivers/irqchip/irq-riscv-imsic-state.h
@@ -67,6 +67,7 @@ struct imsic_priv {
/* IRQ domains (created by platform driver) */
struct irq_domain *base_domain;
+ struct irq_domain *pci_domain;
struct irq_domain *plat_domain;
};
--
2.34.1
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