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iommu/riscv: Enable IOMMU registration and device probe.

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Advertise IOMMU device and its core API.
Only minimal implementation for single identity domain type, without
per-group domain protection.

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Tomasz Jeznach <tjeznach@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/ba79c8eb9c7f1cd9a8961a1b048e3991ee9a2b05.1729059707.git.tjeznach@rivosinc.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Tomasz Jeznach 2024-10-15 23:52:16 -07:00 committed by Joerg Roedel
parent 68682e9578
commit 822e8bc685
1 changed files with 66 additions and 0 deletions
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66
drivers/iommu/riscv/iommu.c
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@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/iommu.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include "iommu-bits.h"
#include "iommu.h"
@ -36,6 +37,60 @@ static void riscv_iommu_disable(struct riscv_iommu_device *iommu)
riscv_iommu_writel(iommu, RISCV_IOMMU_REG_PQCSR, 0);
}
static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain,
struct device *dev)
{
/* Global pass-through already enabled, do nothing for now. */
return 0;
}
static struct iommu_domain riscv_iommu_identity_domain = {
.type = IOMMU_DOMAIN_IDENTITY,
.ops = &(const struct iommu_domain_ops) {
.attach_dev = riscv_iommu_attach_identity_domain,
}
};
static int riscv_iommu_device_domain_type(struct device *dev)
{
return IOMMU_DOMAIN_IDENTITY;
}
static struct iommu_group *riscv_iommu_device_group(struct device *dev)
{
if (dev_is_pci(dev))
return pci_device_group(dev);
return generic_device_group(dev);
}
static int riscv_iommu_of_xlate(struct device *dev, const struct of_phandle_args *args)
{
return iommu_fwspec_add_ids(dev, args->args, 1);
}
static struct iommu_device *riscv_iommu_probe_device(struct device *dev)
{
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct riscv_iommu_device *iommu;
if (!fwspec || !fwspec->iommu_fwnode->dev || !fwspec->num_ids)
return ERR_PTR(-ENODEV);
iommu = dev_get_drvdata(fwspec->iommu_fwnode->dev);
if (!iommu)
return ERR_PTR(-ENODEV);
return &iommu->iommu;
}
static const struct iommu_ops riscv_iommu_ops = {
.of_xlate = riscv_iommu_of_xlate,
.identity_domain = &riscv_iommu_identity_domain,
.def_domain_type = riscv_iommu_device_domain_type,
.device_group = riscv_iommu_device_group,
.probe_device = riscv_iommu_probe_device,
};
static int riscv_iommu_init_check(struct riscv_iommu_device *iommu)
{
u64 ddtp;
@ -74,6 +129,7 @@ static int riscv_iommu_init_check(struct riscv_iommu_device *iommu)
void riscv_iommu_remove(struct riscv_iommu_device *iommu)
{
iommu_device_unregister(&iommu->iommu);
iommu_device_sysfs_remove(&iommu->iommu);
}
@ -99,5 +155,15 @@ int riscv_iommu_init(struct riscv_iommu_device *iommu)
return dev_err_probe(iommu->dev, rc,
"cannot register sysfs interface\n");
rc = iommu_device_register(&iommu->iommu, &riscv_iommu_ops, iommu->dev);
if (rc) {
dev_err_probe(iommu->dev, rc, "cannot register iommu interface\n");
goto err_remove_sysfs;
}
return 0;
err_remove_sysfs:
iommu_device_sysfs_remove(&iommu->iommu);
return rc;
}