[PATCH 21/30] iommu/mtk_v1: Move to iommu_fw_alloc_per_device_ids()
Jason Gunthorpe
jgg at nvidia.com
Wed Nov 29 17:10:28 PST 2023
mtk_v1 supports a single iommu instance with multiple ids.
It open codes the fwspec parse inside the driver, remove all of this and
just call iommu_of_get_single_iommu() to do the same parsing. Using
iommu_of_allow_bus_probe() so this continues to work at bus probe time.
Introduce a per-device data to store the iommu and ids list. Allocate and
initialize it with iommu_fw_alloc_per_device_ids(). Fold
mtk_iommu_v1_create_mapping() into mtk_iommu_v1_probe_device() as it is
done only once per device.
Fix the error handling so we don't leak mappings on error paths.
Convert the rest of the funcs from calling dev_iommu_fwspec_get() to using
the per-device data and remove all use of fwspec.
Convert the places using dev_iommu_priv_get() to use the per-device data
not the iommu.
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
drivers/iommu/mtk_iommu_v1.c | 162 +++++++++++++++--------------------
1 file changed, 67 insertions(+), 95 deletions(-)
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 25b41222abaec1..82f500a1ad74e9 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -16,6 +16,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iommu.h>
+#include <linux/iommu-driver.h>
#include <linux/iopoll.h>
#include <linux/list.h>
#include <linux/module.h>
@@ -108,6 +109,12 @@ struct mtk_iommu_v1_data {
struct mtk_iommu_v1_suspend_reg reg;
};
+struct mtk_iommu_v1_device {
+ struct mtk_iommu_v1_data *iommu;
+ unsigned int num_ids;
+ u32 ids[] __counted_by(num_ids);
+};
+
struct mtk_iommu_v1_domain {
spinlock_t pgtlock; /* lock for page table */
struct iommu_domain domain;
@@ -232,14 +239,14 @@ static irqreturn_t mtk_iommu_v1_isr(int irq, void *dev_id)
static void mtk_iommu_v1_config(struct mtk_iommu_v1_data *data,
struct device *dev, bool enable)
{
+ struct mtk_iommu_v1_device *mdev = dev_iommu_priv_get(dev);
struct mtk_smi_larb_iommu *larb_mmu;
unsigned int larbid, portid;
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
int i;
- for (i = 0; i < fwspec->num_ids; ++i) {
- larbid = mt2701_m4u_to_larb(fwspec->ids[i]);
- portid = mt2701_m4u_to_port(fwspec->ids[i]);
+ for (i = 0; i < mdev->num_ids; ++i) {
+ larbid = mt2701_m4u_to_larb(mdev->ids[i]);
+ portid = mt2701_m4u_to_port(mdev->ids[i]);
larb_mmu = &data->larb_imu[larbid];
dev_dbg(dev, "%s iommu port: %d\n",
@@ -293,7 +300,8 @@ static void mtk_iommu_v1_domain_free(struct iommu_domain *domain)
static int mtk_iommu_v1_attach_device(struct iommu_domain *domain, struct device *dev)
{
- struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_device *mdev = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_data *data = mdev->iommu;
struct mtk_iommu_v1_domain *dom = to_mtk_domain(domain);
struct dma_iommu_mapping *mtk_mapping;
int ret;
@@ -319,7 +327,8 @@ static int mtk_iommu_v1_attach_device(struct iommu_domain *domain, struct device
static int mtk_iommu_v1_identity_attach(struct iommu_domain *identity_domain,
struct device *dev)
{
- struct mtk_iommu_v1_data *data = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_device *mdev = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_data *data = mdev->iommu;
mtk_iommu_v1_config(data, dev, false);
return 0;
@@ -394,128 +403,91 @@ static phys_addr_t mtk_iommu_v1_iova_to_phys(struct iommu_domain *domain, dma_ad
static const struct iommu_ops mtk_iommu_v1_ops;
-/*
- * MTK generation one iommu HW only support one iommu domain, and all the client
- * sharing the same iova address space.
- */
-static int mtk_iommu_v1_create_mapping(struct device *dev, struct of_phandle_args *args)
+static struct iommu_device *
+mtk_iommu_v1_probe_device(struct iommu_probe_info *pinf)
{
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- struct mtk_iommu_v1_data *data;
- struct platform_device *m4updev;
struct dma_iommu_mapping *mtk_mapping;
+ struct mtk_iommu_v1_device *mdev;
+ struct device *dev = pinf->dev;
+ struct mtk_iommu_v1_data *data;
+ int idx, larbid, larbidx;
+ struct device_link *link;
+ struct device *larbdev;
int ret;
- if (args->args_count != 1) {
- dev_err(dev, "invalid #iommu-cells(%d) property for IOMMU\n",
- args->args_count);
- return -EINVAL;
- }
+ iommu_of_allow_bus_probe(pinf);
+ data = iommu_of_get_single_iommu(pinf, &mtk_iommu_v1_ops, 1,
+ struct mtk_iommu_v1_data, iommu);
+ if (IS_ERR(data))
+ return ERR_CAST(data);
- if (!fwspec) {
- ret = iommu_fwspec_init(dev, &args->np->fwnode, &mtk_iommu_v1_ops);
- if (ret)
- return ret;
- fwspec = dev_iommu_fwspec_get(dev);
- } else if (dev_iommu_fwspec_get(dev)->ops != &mtk_iommu_v1_ops) {
- return -EINVAL;
- }
+ mdev = iommu_fw_alloc_per_device_ids(pinf, mdev);
+ if (IS_ERR(mdev))
+ return ERR_CAST(mdev);
+ mdev->iommu = data;
- if (!dev_iommu_priv_get(dev)) {
- /* Get the m4u device */
- m4updev = of_find_device_by_node(args->np);
- if (WARN_ON(!m4updev))
- return -EINVAL;
-
- dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
- }
-
- ret = iommu_fwspec_add_ids(dev, args->args, 1);
- if (ret)
- return ret;
-
- data = dev_iommu_priv_get(dev);
+ /*
+ * MTK generation one iommu HW only support one iommu domain, and all
+ * the client sharing the same iova address space.
+ */
mtk_mapping = data->mapping;
if (!mtk_mapping) {
/* MTK iommu support 4GB iova address space. */
mtk_mapping = arm_iommu_create_mapping(&platform_bus_type,
0, 1ULL << 32);
- if (IS_ERR(mtk_mapping))
- return PTR_ERR(mtk_mapping);
+ if (IS_ERR(mtk_mapping)) {
+ ret = PTR_ERR(mtk_mapping);
+ goto err_free;
+ }
data->mapping = mtk_mapping;
}
- return 0;
-}
-
-static struct iommu_device *mtk_iommu_v1_probe_device(struct device *dev)
-{
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- struct of_phandle_args iommu_spec;
- struct mtk_iommu_v1_data *data;
- int err, idx = 0, larbid, larbidx;
- struct device_link *link;
- struct device *larbdev;
-
- /*
- * In the deferred case, free the existed fwspec.
- * Always initialize the fwspec internally.
- */
- if (fwspec) {
- iommu_fwspec_free(dev);
- fwspec = dev_iommu_fwspec_get(dev);
- }
-
- while (!of_parse_phandle_with_args(dev->of_node, "iommus",
- "#iommu-cells",
- idx, &iommu_spec)) {
-
- err = mtk_iommu_v1_create_mapping(dev, &iommu_spec);
- of_node_put(iommu_spec.np);
- if (err)
- return ERR_PTR(err);
-
- /* dev->iommu_fwspec might have changed */
- fwspec = dev_iommu_fwspec_get(dev);
- idx++;
- }
-
- data = dev_iommu_priv_get(dev);
-
/* Link the consumer device with the smi-larb device(supplier) */
- larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
- if (larbid >= MT2701_LARB_NR_MAX)
- return ERR_PTR(-EINVAL);
+ larbid = mt2701_m4u_to_larb(mdev->ids[0]);
+ if (larbid >= MT2701_LARB_NR_MAX) {
+ ret = -EINVAL;
+ goto err_mapping;
+ }
- for (idx = 1; idx < fwspec->num_ids; idx++) {
- larbidx = mt2701_m4u_to_larb(fwspec->ids[idx]);
+ for (idx = 1; idx < mdev->num_ids; idx++) {
+ larbidx = mt2701_m4u_to_larb(mdev->ids[idx]);
if (larbid != larbidx) {
dev_err(dev, "Can only use one larb. Fail at larb%d-%d.\n",
larbid, larbidx);
- return ERR_PTR(-EINVAL);
+ ret = -EINVAL;
+ goto err_mapping;
}
}
larbdev = data->larb_imu[larbid].dev;
- if (!larbdev)
- return ERR_PTR(-EINVAL);
+ if (!larbdev) {
+ ret = -EINVAL;
+ goto err_mapping;
+ }
link = device_link_add(dev, larbdev,
DL_FLAG_PM_RUNTIME | DL_FLAG_STATELESS);
if (!link)
dev_err(dev, "Unable to link %s\n", dev_name(larbdev));
+ dev_iommu_priv_set(pinf->dev, mdev);
return &data->iommu;
+
+err_mapping:
+ arm_iommu_release_mapping(mtk_mapping);
+err_free:
+ kfree(mdev);
+ return ERR_PTR(ret);
}
static void mtk_iommu_v1_probe_finalize(struct device *dev)
{
+ struct mtk_iommu_v1_device *mdev = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_data *data = mdev->iommu;
struct dma_iommu_mapping *mtk_mapping;
- struct mtk_iommu_v1_data *data;
int err;
- data = dev_iommu_priv_get(dev);
mtk_mapping = data->mapping;
err = arm_iommu_attach_device(dev, mtk_mapping);
@@ -525,15 +497,15 @@ static void mtk_iommu_v1_probe_finalize(struct device *dev)
static void mtk_iommu_v1_release_device(struct device *dev)
{
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
- struct mtk_iommu_v1_data *data;
+ struct mtk_iommu_v1_device *mdev = dev_iommu_priv_get(dev);
+ struct mtk_iommu_v1_data *data = mdev->iommu;
struct device *larbdev;
unsigned int larbid;
- data = dev_iommu_priv_get(dev);
- larbid = mt2701_m4u_to_larb(fwspec->ids[0]);
+ larbid = mt2701_m4u_to_larb(mdev->ids[0]);
larbdev = data->larb_imu[larbid].dev;
device_link_remove(dev, larbdev);
+ kfree(mdev);
}
static int mtk_iommu_v1_hw_init(const struct mtk_iommu_v1_data *data)
@@ -580,7 +552,7 @@ static int mtk_iommu_v1_hw_init(const struct mtk_iommu_v1_data *data)
static const struct iommu_ops mtk_iommu_v1_ops = {
.identity_domain = &mtk_iommu_v1_identity_domain,
.domain_alloc_paging = mtk_iommu_v1_domain_alloc_paging,
- .probe_device = mtk_iommu_v1_probe_device,
+ .probe_device_pinf = mtk_iommu_v1_probe_device,
.probe_finalize = mtk_iommu_v1_probe_finalize,
.release_device = mtk_iommu_v1_release_device,
.device_group = generic_device_group,
--
2.42.0
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