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irqchip/gic-v3-its: Provide MSI parent infrastructure

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To support per device MSI domains the ITS must provide MSI parent domain
functionality.

Provide the basic skeleton for this:

   - msi_parent_ops
   - child domain init callback
   - the MSI parent flag set in irqdomain::flags

This does not make ITS a functional parent domain as there is no bit set in
the bus_select_mask yet, but it provides the base to implement PCI and
platform MSI support gradually on top.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240623142234.903076277@linutronix.de
This commit is contained in:
Thomas Gleixner 2024-06-23 17:18:36 +02:00
parent 72e257c6f0
commit 48f71d56e2
5 changed files with 41 additions and 1 deletions
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1
drivers/irqchip/Kconfig
View File

@ -41,6 +41,7 @@ config ARM_GIC_V3
config ARM_GIC_V3_ITS
bool
select GENERIC_MSI_IRQ
select IRQ_MSI_LIB
default ARM_GIC_V3
config ARM_GIC_V3_ITS_PCI

2
drivers/irqchip/Makefile
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@ -32,7 +32,7 @@ obj-$(CONFIG_ARCH_REALVIEW) += irq-gic-realview.o
obj-$(CONFIG_IRQ_MSI_LIB) += irq-msi-lib.o
obj-$(CONFIG_ARM_GIC_V2M) += irq-gic-v2m.o
obj-$(CONFIG_ARM_GIC_V3) += irq-gic-v3.o irq-gic-v3-mbi.o irq-gic-common.o
obj-$(CONFIG_ARM_GIC_V3_ITS) += irq-gic-v3-its.o irq-gic-v3-its-platform-msi.o irq-gic-v4.o
obj-$(CONFIG_ARM_GIC_V3_ITS) += irq-gic-v3-its.o irq-gic-v3-its-platform-msi.o irq-gic-v4.o irq-gic-v3-its-msi-parent.o
obj-$(CONFIG_ARM_GIC_V3_ITS_PCI) += irq-gic-v3-its-pci-msi.o
obj-$(CONFIG_ARM_GIC_V3_ITS_FSL_MC) += irq-gic-v3-its-fsl-mc-msi.o
obj-$(CONFIG_PARTITION_PERCPU) += irq-partition-percpu.o

3
drivers/irqchip/irq-gic-common.h
View File

@ -8,6 +8,7 @@
#include <linux/of.h>
#include <linux/irqdomain.h>
#include <linux/msi.h>
#include <linux/irqchip/arm-gic-common.h>
struct gic_quirk {
@ -29,6 +30,8 @@ void gic_enable_quirks(u32 iidr, const struct gic_quirk *quirks,
void gic_enable_of_quirks(const struct device_node *np,
const struct gic_quirk *quirks, void *data);
extern const struct msi_parent_ops gic_v3_its_msi_parent_ops;
#define RDIST_FLAGS_PROPBASE_NEEDS_FLUSHING (1 << 0)
#define RDIST_FLAGS_RD_TABLES_PREALLOCATED (1 << 1)
#define RDIST_FLAGS_FORCE_NON_SHAREABLE (1 << 2)

31
drivers/irqchip/irq-gic-v3-its-msi-parent.c Normal file
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@ -0,0 +1,31 @@
// SPDX-License-Identifier: GPL-2.0-only
// Copyright (C) 2022 Linutronix GmbH
// Copyright (C) 2022 Intel
#include "irq-gic-common.h"
#include "irq-msi-lib.h"
#define ITS_MSI_FLAGS_REQUIRED (MSI_FLAG_USE_DEF_DOM_OPS | \
MSI_FLAG_USE_DEF_CHIP_OPS)
#define ITS_MSI_FLAGS_SUPPORTED (MSI_GENERIC_FLAGS_MASK | \
MSI_FLAG_PCI_MSIX | \
MSI_FLAG_MULTI_PCI_MSI | \
MSI_FLAG_PCI_MSI_MASK_PARENT)
static bool its_init_dev_msi_info(struct device *dev, struct irq_domain *domain,
struct irq_domain *real_parent, struct msi_domain_info *info)
{
if (!msi_lib_init_dev_msi_info(dev, domain, real_parent, info))
return false;
return true;
}
const struct msi_parent_ops gic_v3_its_msi_parent_ops = {
.supported_flags = ITS_MSI_FLAGS_SUPPORTED,
.required_flags = ITS_MSI_FLAGS_REQUIRED,
.bus_select_token = DOMAIN_BUS_NEXUS,
.prefix = "ITS-",
.init_dev_msi_info = its_init_dev_msi_info,
};

5
drivers/irqchip/irq-gic-v3-its.c
View File

@ -38,6 +38,7 @@
#include <asm/exception.h>
#include "irq-gic-common.h"
#include "irq-msi-lib.h"
#define ITS_FLAGS_CMDQ_NEEDS_FLUSHING (1ULL << 0)
#define ITS_FLAGS_WORKAROUND_CAVIUM_22375 (1ULL << 1)
@ -3688,6 +3689,7 @@ static void its_irq_domain_free(struct irq_domain *domain, unsigned int virq,
}
static const struct irq_domain_ops its_domain_ops = {
.select = msi_lib_irq_domain_select,
.alloc = its_irq_domain_alloc,
.free = its_irq_domain_free,
.activate = its_irq_domain_activate,
@ -4993,6 +4995,9 @@ static int its_init_domain(struct its_node *its)
irq_domain_update_bus_token(inner_domain, DOMAIN_BUS_NEXUS);
inner_domain->msi_parent_ops = &gic_v3_its_msi_parent_ops;
inner_domain->flags |= IRQ_DOMAIN_FLAG_MSI_PARENT;
return 0;
}