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iommu/riscv: Add ACPI support

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RISC-V IO Mapping Table (RIMT) provides the information about the IOMMU
to the OS in ACPI. Add support for ACPI in RISC-V IOMMU drivers by using
RIMT data.

The changes at high level are,

a) Register the IOMMU with RIMT data structures.
b) Enable probing of platform IOMMU in ACPI way using the ACPIID defined
   for the RISC-V IOMMU in the BRS spec [1]. Configure the MSI domain if
   the platform IOMMU uses MSIs.

[1] - https://github.com/riscv-non-isa/riscv-brs/blob/main/acpi-id.adoc

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20250818045807.763922-4-sunilvl@ventanamicro.com
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Sunil V L 2025-08-18 10:28:07 +05:30 • committed by Joerg Roedel
parent cbf4fbc484
commit 4f901b3dce
2 changed files with 26 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

17
drivers/iommu/riscv/iommu-platform.c
View file

@ -10,6 +10,8 @@
* Tomasz Jeznach <tjeznach@rivosinc.com>
*/
#include <linux/acpi.h>
#include <linux/irqchip/riscv-imsic.h>
#include <linux/kernel.h>
#include <linux/msi.h>
#include <linux/of_irq.h>
@ -46,6 +48,7 @@ static int riscv_iommu_platform_probe(struct platform_device *pdev)
enum riscv_iommu_igs_settings igs;
struct device *dev = &pdev->dev;
struct riscv_iommu_device *iommu = NULL;
struct irq_domain *msi_domain;
struct resource *res = NULL;
int vec, ret;
@ -76,8 +79,13 @@ static int riscv_iommu_platform_probe(struct platform_device *pdev)
switch (igs) {
case RISCV_IOMMU_CAPABILITIES_IGS_BOTH:
case RISCV_IOMMU_CAPABILITIES_IGS_MSI:
if (is_of_node(dev->fwnode))
if (is_of_node(dev_fwnode(dev))) {
of_msi_configure(dev, to_of_node(dev->fwnode));
} else {
msi_domain = irq_find_matching_fwnode(imsic_acpi_get_fwnode(dev),
DOMAIN_BUS_PLATFORM_MSI);
dev_set_msi_domain(dev, msi_domain);
}
if (!dev_get_msi_domain(dev)) {
dev_warn(dev, "failed to find an MSI domain\n");
@ -150,6 +158,12 @@ static const struct of_device_id riscv_iommu_of_match[] = {
{},
};
static const struct acpi_device_id riscv_iommu_acpi_match[] = {
{ "RSCV0004", 0 },
{}
};
MODULE_DEVICE_TABLE(acpi, riscv_iommu_acpi_match);
static struct platform_driver riscv_iommu_platform_driver = {
.probe = riscv_iommu_platform_probe,
.remove = riscv_iommu_platform_remove,
@ -158,6 +172,7 @@ static struct platform_driver riscv_iommu_platform_driver = {
.name = "riscv,iommu",
.of_match_table = riscv_iommu_of_match,
.suppress_bind_attrs = true,
.acpi_match_table = riscv_iommu_acpi_match,
},
};

10
drivers/iommu/riscv/iommu.c
View file

@ -12,6 +12,8 @@
#define pr_fmt(fmt) "riscv-iommu: " fmt
#include <linux/acpi.h>
#include <linux/acpi_rimt.h>
#include <linux/compiler.h>
#include <linux/crash_dump.h>
#include <linux/init.h>
@ -1650,6 +1652,14 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu)
goto err_iodir_off;
}
if (!acpi_disabled) {
rc = rimt_iommu_register(iommu->dev);
if (rc) {
dev_err_probe(iommu->dev, rc, "cannot register iommu with RIMT\n");
goto err_remove_sysfs;
}
}
rc = iommu_device_register(&iommu->iommu, &riscv_iommu_ops, iommu->dev);
if (rc) {
dev_err_probe(iommu->dev, rc, "cannot register iommu interface\n");