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irqchip/riscv-imsic: Add device MSI domain support for PCI devices

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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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Reviewed-by: Björn Töpel <bjorn@rivosinc.com>
Link: https://lore.kernel.org/r/20240307140307.646078-5-apatel@ventanamicro.com
This commit is contained in:
Anup Patel 2024-03-07 19:33:02 +05:30 committed by Thomas Gleixner
parent 027e125acd
commit 5c5a71d043
2 changed files with 40 additions and 2 deletions
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7
drivers/irqchip/Kconfig
View File

@ -547,6 +547,13 @@ 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 SIFIVE_PLIC
bool
depends on RISCV

35
drivers/irqchip/irq-riscv-imsic-platform.c
View File

@ -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>
@ -207,6 +208,28 @@ 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,
@ -230,6 +253,13 @@ 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
@ -269,11 +299,12 @@ 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,
};