[PATCH 5/6] fsl_mc: Remove legacy MSI implementation
From: Marc Zyngier
Date: Wed Feb 18 2026 - 08:54:33 EST
Get rid of the most of the fsl_mc MSI infrastructure, which is
now totally unused.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
drivers/bus/fsl-mc/fsl-mc-msi.c | 140 +---------------
drivers/bus/fsl-mc/fsl-mc-private.h | 1 -
drivers/irqchip/Kconfig | 6 -
drivers/irqchip/Makefile | 1 -
drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c | 168 --------------------
include/linux/fsl/mc.h | 4 -
6 files changed, 1 insertion(+), 319 deletions(-)
delete mode 100644 drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
index c9f50969e88ce..8ee4796040a8d 100644
--- a/drivers/bus/fsl-mc/fsl-mc-msi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
@@ -15,46 +15,6 @@
#include "fsl-mc-private.h"
-#ifdef GENERIC_MSI_DOMAIN_OPS
-/*
- * Generate a unique ID identifying the interrupt (only used within the MSI
- * irqdomain. Combine the icid with the interrupt index.
- */
-static irq_hw_number_t fsl_mc_domain_calc_hwirq(struct fsl_mc_device *dev,
- struct msi_desc *desc)
-{
- /*
- * Make the base hwirq value for ICID*10000 so it is readable
- * as a decimal value in /proc/interrupts.
- */
- return (irq_hw_number_t)(desc->msi_index + (dev->icid * 10000));
-}
-
-static void fsl_mc_msi_set_desc(msi_alloc_info_t *arg,
- struct msi_desc *desc)
-{
- arg->desc = desc;
- arg->hwirq = fsl_mc_domain_calc_hwirq(to_fsl_mc_device(desc->dev),
- desc);
-}
-#else
-#define fsl_mc_msi_set_desc NULL
-#endif
-
-static void fsl_mc_msi_update_dom_ops(struct msi_domain_info *info)
-{
- struct msi_domain_ops *ops = info->ops;
-
- if (!ops)
- return;
-
- /*
- * set_desc should not be set by the caller
- */
- if (!ops->set_desc)
- ops->set_desc = fsl_mc_msi_set_desc;
-}
-
static void __fsl_mc_msi_write_msg(struct fsl_mc_device *mc_bus_dev,
struct fsl_mc_device_irq *mc_dev_irq,
struct msi_desc *msi_desc)
@@ -125,96 +85,6 @@ static void fsl_mc_write_msi_msg(struct msi_desc *msi_desc, struct msi_msg *msg)
__fsl_mc_msi_write_msg(mc_bus_dev, mc_dev_irq, msi_desc);
}
-/*
- * NOTE: This function is invoked with interrupts disabled
- */
-static void fsl_mc_msi_write_msg(struct irq_data *irq_data,
- struct msi_msg *msg)
-{
- struct msi_desc *msi_desc = irq_data_get_msi_desc(irq_data);
-
- fsl_mc_write_msi_msg(msi_desc, msg);
-}
-
-static void fsl_mc_msi_update_chip_ops(struct msi_domain_info *info)
-{
- struct irq_chip *chip = info->chip;
-
- if (!chip)
- return;
-
- /*
- * irq_write_msi_msg should not be set by the caller
- */
- if (!chip->irq_write_msi_msg)
- chip->irq_write_msi_msg = fsl_mc_msi_write_msg;
-}
-
-/**
- * fsl_mc_msi_create_irq_domain - Create a fsl-mc MSI interrupt domain
- * @fwnode: Optional firmware node of the interrupt controller
- * @info: MSI domain info
- * @parent: Parent irq domain
- *
- * Updates the domain and chip ops and creates a fsl-mc MSI
- * interrupt domain.
- *
- * Returns:
- * A domain pointer or NULL in case of failure.
- */
-struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
- struct msi_domain_info *info,
- struct irq_domain *parent)
-{
- struct irq_domain *domain;
-
- if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE)))
- info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
- if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
- fsl_mc_msi_update_dom_ops(info);
- if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
- fsl_mc_msi_update_chip_ops(info);
- info->flags |= MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS | MSI_FLAG_FREE_MSI_DESCS;
-
- domain = msi_create_irq_domain(fwnode, info, parent);
- if (domain)
- irq_domain_update_bus_token(domain, DOMAIN_BUS_FSL_MC_MSI);
-
- return domain;
-}
-
-struct irq_domain *fsl_mc_find_msi_domain(struct device *dev)
-{
- struct device *root_dprc_dev;
- struct device *bus_dev;
- struct irq_domain *msi_domain;
- struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
-
- fsl_mc_get_root_dprc(dev, &root_dprc_dev);
- bus_dev = root_dprc_dev->parent;
-
- if (bus_dev->of_node) {
- msi_domain = of_msi_map_get_device_domain(dev,
- mc_dev->icid,
- DOMAIN_BUS_FSL_MC_MSI);
-
- /*
- * if the msi-map property is missing assume that all the
- * child containers inherit the domain from the parent
- */
- if (!msi_domain)
-
- msi_domain = of_msi_get_domain(bus_dev,
- bus_dev->of_node,
- DOMAIN_BUS_FSL_MC_MSI);
- } else {
- msi_domain = iort_get_device_domain(dev, mc_dev->icid,
- DOMAIN_BUS_FSL_MC_MSI);
- }
-
- return msi_domain;
-}
-
struct irq_domain *fsl_mc_get_msi_parent(struct device *dev)
{
struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
@@ -232,18 +102,10 @@ struct irq_domain *fsl_mc_get_msi_parent(struct device *dev)
int fsl_mc_msi_domain_alloc_irqs(struct device *dev, unsigned int irq_count)
{
int error = msi_setup_device_data(dev);
-
if (error)
return error;
- /*
- * NOTE: Calling this function will trigger the invocation of the
- * its_fsl_mc_msi_prepare() callback
- */
- if (!irq_domain_is_msi_parent(dev_get_msi_domain(dev)))
- error = msi_domain_alloc_irqs_range(dev, MSI_DEFAULT_DOMAIN, 0, irq_count - 1);
- else
- error = platform_device_msi_init_and_alloc_irqs(dev, irq_count, fsl_mc_write_msi_msg);
+ error = platform_device_msi_init_and_alloc_irqs(dev, irq_count, fsl_mc_write_msi_msg);
if (error)
dev_err(dev, "Failed to allocate IRQs\n");
return error;
diff --git a/drivers/bus/fsl-mc/fsl-mc-private.h b/drivers/bus/fsl-mc/fsl-mc-private.h
index 44868f874fd66..197edcc8cde46 100644
--- a/drivers/bus/fsl-mc/fsl-mc-private.h
+++ b/drivers/bus/fsl-mc/fsl-mc-private.h
@@ -641,7 +641,6 @@ int fsl_mc_msi_domain_alloc_irqs(struct device *dev,
void fsl_mc_msi_domain_free_irqs(struct device *dev);
-struct irq_domain *fsl_mc_find_msi_domain(struct device *dev);
struct irq_domain *fsl_mc_get_msi_parent(struct device *dev);
int __must_check fsl_create_mc_io(struct device *dev,
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index f334f49c9791f..c1f2095400c74 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -51,12 +51,6 @@ config ARM_GIC_V3_ITS
default ARM_GIC_V3
select IRQ_MSI_IOMMU
-config ARM_GIC_V3_ITS_FSL_MC
- bool
- depends on ARM_GIC_V3_ITS
- depends on FSL_MC_BUS
- default ARM_GIC_V3_ITS
-
config ARM_GIC_V5
bool
select IRQ_DOMAIN_HIERARCHY
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 6a229443efe08..900f03299d9a5 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -35,7 +35,6 @@ 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-$(CONFIG_ARM_GIC_ITS_PARENT) += irq-gic-its-msi-parent.o
obj-$(CONFIG_ARM_GIC_V3_ITS) += irq-gic-v3-its.o irq-gic-v4.o
-obj-$(CONFIG_ARM_GIC_V3_ITS_FSL_MC) += irq-gic-v3-its-fsl-mc-msi.o
obj-$(CONFIG_ARM_GIC_V5) += irq-gic-v5.o irq-gic-v5-irs.o irq-gic-v5-its.o \
irq-gic-v5-iwb.o
obj-$(CONFIG_HISILICON_IRQ_MBIGEN) += irq-mbigen.o
diff --git a/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c b/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
deleted file mode 100644
index b5785472765a3..0000000000000
--- a/drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c
+++ /dev/null
@@ -1,168 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Freescale Management Complex (MC) bus driver MSI support
- *
- * Copyright (C) 2015-2016 Freescale Semiconductor, Inc.
- * Author: German Rivera <German.Rivera@xxxxxxxxxxxxx>
- *
- */
-
-#include <linux/acpi.h>
-#include <linux/acpi_iort.h>
-#include <linux/irq.h>
-#include <linux/msi.h>
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/fsl/mc.h>
-
-static struct irq_chip its_msi_irq_chip = {
- .name = "ITS-fMSI",
- .irq_mask = irq_chip_mask_parent,
- .irq_unmask = irq_chip_unmask_parent,
- .irq_eoi = irq_chip_eoi_parent,
- .irq_set_affinity = msi_domain_set_affinity
-};
-
-static u32 fsl_mc_msi_domain_get_msi_id(struct irq_domain *domain,
- struct fsl_mc_device *mc_dev)
-{
- struct device_node *of_node;
- u32 out_id;
-
- of_node = irq_domain_get_of_node(domain);
- out_id = of_node ? of_msi_xlate(&mc_dev->dev, &of_node, mc_dev->icid) :
- iort_msi_map_id(&mc_dev->dev, mc_dev->icid);
-
- return out_id;
-}
-
-static int its_fsl_mc_msi_prepare(struct irq_domain *msi_domain,
- struct device *dev,
- int nvec, msi_alloc_info_t *info)
-{
- struct fsl_mc_device *mc_bus_dev;
- struct msi_domain_info *msi_info;
-
- if (!dev_is_fsl_mc(dev))
- return -EINVAL;
-
- mc_bus_dev = to_fsl_mc_device(dev);
- if (!(mc_bus_dev->flags & FSL_MC_IS_DPRC))
- return -EINVAL;
-
- /*
- * Set the device Id to be passed to the GIC-ITS:
- *
- * NOTE: This device id corresponds to the IOMMU stream ID
- * associated with the DPRC object (ICID).
- */
- info->scratchpad[0].ul = fsl_mc_msi_domain_get_msi_id(msi_domain,
- mc_bus_dev);
- msi_info = msi_get_domain_info(msi_domain->parent);
-
- /* Allocate at least 32 MSIs, and always as a power of 2 */
- nvec = max_t(int, 32, roundup_pow_of_two(nvec));
- return msi_info->ops->msi_prepare(msi_domain->parent, dev, nvec, info);
-}
-
-static struct msi_domain_ops its_fsl_mc_msi_ops __ro_after_init = {
- .msi_prepare = its_fsl_mc_msi_prepare,
-};
-
-static struct msi_domain_info its_fsl_mc_msi_domain_info = {
- .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
- .ops = &its_fsl_mc_msi_ops,
- .chip = &its_msi_irq_chip,
-};
-
-static const struct of_device_id its_device_id[] = {
- { .compatible = "arm,gic-v3-its", },
- {},
-};
-
-static void __init its_fsl_mc_msi_init_one(struct fwnode_handle *handle,
- const char *name)
-{
- struct irq_domain *parent;
- struct irq_domain *mc_msi_domain;
-
- parent = irq_find_matching_fwnode(handle, DOMAIN_BUS_NEXUS);
- if (!parent || !msi_get_domain_info(parent)) {
- pr_err("%s: unable to locate ITS domain\n", name);
- return;
- }
-
- mc_msi_domain = fsl_mc_msi_create_irq_domain(handle,
- &its_fsl_mc_msi_domain_info,
- parent);
- if (!mc_msi_domain) {
- pr_err("%s: unable to create fsl-mc domain\n", name);
- return;
- }
-
- pr_info("fsl-mc MSI: %s domain created\n", name);
-}
-
-#ifdef CONFIG_ACPI
-static int __init
-its_fsl_mc_msi_parse_madt(union acpi_subtable_headers *header,
- const unsigned long end)
-{
- struct acpi_madt_generic_translator *its_entry;
- struct fwnode_handle *dom_handle;
- const char *node_name;
- int err = 0;
-
- its_entry = (struct acpi_madt_generic_translator *)header;
- node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
- (long)its_entry->base_address);
-
- dom_handle = iort_find_domain_token(its_entry->translation_id);
- if (!dom_handle) {
- pr_err("%s: Unable to locate ITS domain handle\n", node_name);
- err = -ENXIO;
- goto out;
- }
-
- its_fsl_mc_msi_init_one(dom_handle, node_name);
-
-out:
- kfree(node_name);
- return err;
-}
-
-
-static void __init its_fsl_mc_acpi_msi_init(void)
-{
- acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
- its_fsl_mc_msi_parse_madt, 0);
-}
-#else
-static inline void its_fsl_mc_acpi_msi_init(void) { }
-#endif
-
-static void __init its_fsl_mc_of_msi_init(void)
-{
- struct device_node *np;
-
- for (np = of_find_matching_node(NULL, its_device_id); np;
- np = of_find_matching_node(np, its_device_id)) {
- if (!of_device_is_available(np))
- continue;
- if (!of_property_read_bool(np, "msi-controller"))
- continue;
-
- its_fsl_mc_msi_init_one(of_fwnode_handle(np),
- np->full_name);
- }
-}
-
-static int __init its_fsl_mc_msi_init(void)
-{
- its_fsl_mc_of_msi_init();
- its_fsl_mc_acpi_msi_init();
-
- return 0;
-}
-
-early_initcall(its_fsl_mc_msi_init);
diff --git a/include/linux/fsl/mc.h b/include/linux/fsl/mc.h
index bcc38c0fc230a..e9522233f9b57 100644
--- a/include/linux/fsl/mc.h
+++ b/include/linux/fsl/mc.h
@@ -425,10 +425,6 @@ int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev,
void fsl_mc_object_free(struct fsl_mc_device *mc_adev);
-struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
- struct msi_domain_info *info,
- struct irq_domain *parent);
-
int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev);
void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev);
--
2.47.3