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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC 2/2] smmu: add support for generic DT bindings
Restructure some of the code and add supporting functions for adding
generic device tree (DT) binding support. The normal add_device and
dt_xlate functions are wrappers of the legacy functions due to legacy
calls needing more arguments because the find_smmu can't a smmu that
isn't initialized.
Signed-off-by: Brian Woods <brian.woods@xxxxxxxxxx>
---
RFC especially on:
- Checks for the: arm_smmu_dt_add_device* and arm_smmu_dt_xlate*
functions.
xen/drivers/passthrough/arm/smmu.c | 118 +++++++++++++++++++++++++---------
xen/drivers/passthrough/device_tree.c | 17 +----
2 files changed, 87 insertions(+), 48 deletions(-)
diff --git a/xen/drivers/passthrough/arm/smmu.c
b/xen/drivers/passthrough/arm/smmu.c
index c5db5be..08787cd 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -251,6 +251,8 @@ struct iommu_group
atomic_t ref;
};
+static const struct arm_smmu_device *find_smmu(const struct device *dev);
+
static struct iommu_group *iommu_group_alloc(void)
{
struct iommu_group *group = xzalloc(struct iommu_group);
@@ -775,64 +777,114 @@ static int insert_smmu_master(struct arm_smmu_device
*smmu,
return 0;
}
-static int register_smmu_master(struct arm_smmu_device *smmu,
- struct device *dev,
- struct of_phandle_args *masterspec)
+/*
+ * Since smmu isn't done initializing before this is run in the legacy
+ * case, create a function where that's passed and then have the generic
+ * function just be a simple wrapper.
+ */
+static int arm_smmu_dt_xlate_legacy(struct device *dev,
+ const struct of_phandle_args *spec,
+ struct iommu_fwspec *fwspec)
+{
+ if ((spec->args_count + fwspec->num_ids) > MAX_MASTER_STREAMIDS) {
+ dev_err(dev,
+ "reached maximum number (%d) of stream IDs for master
device %s\n",
+ MAX_MASTER_STREAMIDS, spec->np->name);
+ return -ENOSPC;
+ }
+
+ /* adding the ids here */
+ return iommu_fwspec_add_ids(dev,
+ spec->args,
+ spec->args_count);
+}
+
+static int arm_smmu_dt_xlate(struct device *dev,
+ const struct dt_phandle_args *spec)
+{
+ return arm_smmu_dt_xlate_legacy(dev,
+ spec,
+ dev_iommu_fwspec_get(dev));
+}
+
+static int arm_smmu_dt_add_device_legacy(struct arm_smmu_device *smmu,
+ struct device *dev,
+ struct iommu_fwspec *fwspec)
{
- int i, ret = 0;
+ int i;
struct arm_smmu_master *master;
+ struct device_node *dev_node = dev_get_dev_node(dev);
+
+ BUG_ON(dev == NULL);
+ BUG_ON(dev_node == NULL);
- master = find_smmu_master(smmu, masterspec->np);
+ master = find_smmu_master(smmu, dev_node);
if (master) {
dev_err(dev,
"rejecting multiple registrations for master device
%s\n",
- masterspec->np->name);
+ dev_node->name);
return -EBUSY;
}
- if (masterspec->args_count > MAX_MASTER_STREAMIDS) {
- dev_err(dev,
- "reached maximum number (%d) of stream IDs for master
device %s\n",
- MAX_MASTER_STREAMIDS, masterspec->np->name);
- return -ENOSPC;
- }
-
master = devm_kzalloc(dev, sizeof(*master), GFP_KERNEL);
if (!master) {
return -ENOMEM;
}
- master->of_node = masterspec->np;
-
- ret = iommu_fwspec_init(&master->of_node->dev, smmu->dev);
- if (ret) {
- kfree(master);
- return ret;
- }
- master->cfg.fwspec = dev_iommu_fwspec_get(&master->of_node->dev);
+ master->of_node = dev_node;
- /* adding the ids here */
- ret = iommu_fwspec_add_ids(&masterspec->np->dev,
- masterspec->args,
- masterspec->args_count);
- if (ret)
- return ret;
+ master->cfg.fwspec = fwspec;
/* Xen: Let Xen know that the device is protected by an SMMU */
- dt_device_set_protected(masterspec->np);
+ dt_device_set_protected(dev_node);
if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH)) {
- for (i = 0; i < master->cfg.fwspec->num_ids; ++i) {
- if (masterspec->args[i] >= smmu->num_mapping_groups) {
+ for (i = 0; i < fwspec->num_ids; ++i) {
+ if (fwspec->ids[i] >= smmu->num_mapping_groups) {
dev_err(dev,
"stream ID for master device %s greater
than maximum allowed (%d)\n",
- masterspec->np->name,
smmu->num_mapping_groups);
+ dev_node->name,
smmu->num_mapping_groups);
return -ERANGE;
}
}
}
+
return insert_smmu_master(smmu, master);
}
+static int arm_smmu_dt_add_device(u8 devfn, struct device *dev)
+{
+ struct arm_smmu_device *smmu;
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+
+ smmu = (struct arm_smmu_device *) find_smmu(fwspec->iommu_dev);
+
+ return arm_smmu_dt_add_device_legacy(smmu, dev, fwspec);
+}
+
+static int register_smmu_master(struct arm_smmu_device *smmu,
+ struct device *dev,
+ struct of_phandle_args *masterspec)
+{
+ int ret = 0;
+ struct iommu_fwspec *fwspec;
+
+ ret = iommu_fwspec_init(&masterspec->np->dev, smmu->dev);
+ if (ret)
+ return ret;
+
+ fwspec = dev_iommu_fwspec_get(&masterspec->np->dev);
+
+ ret = arm_smmu_dt_xlate_legacy(&masterspec->np->dev,
+ masterspec,
+ fwspec);
+ if (ret)
+ return ret;
+
+ return arm_smmu_dt_add_device_legacy(smmu,
+ &masterspec->np->dev,
+ fwspec);
+}
+
static struct arm_smmu_device *find_smmu_for_device(struct device *dev)
{
struct arm_smmu_device *smmu;
@@ -2754,6 +2806,7 @@ static void arm_smmu_iommu_domain_teardown(struct domain
*d)
static const struct iommu_ops arm_smmu_iommu_ops = {
.init = arm_smmu_iommu_domain_init,
.hwdom_init = arm_smmu_iommu_hwdom_init,
+ .add_device = arm_smmu_dt_add_device,
.teardown = arm_smmu_iommu_domain_teardown,
.iotlb_flush = arm_smmu_iotlb_flush,
.iotlb_flush_all = arm_smmu_iotlb_flush_all,
@@ -2761,9 +2814,10 @@ static const struct iommu_ops arm_smmu_iommu_ops = {
.reassign_device = arm_smmu_reassign_dev,
.map_page = arm_iommu_map_page,
.unmap_page = arm_iommu_unmap_page,
+ .dt_xlate = arm_smmu_dt_xlate,
};
-static __init const struct arm_smmu_device *find_smmu(const struct device *dev)
+static const struct arm_smmu_device *find_smmu(const struct device *dev)
{
struct arm_smmu_device *smmu;
bool found = false;
diff --git a/xen/drivers/passthrough/device_tree.c
b/xen/drivers/passthrough/device_tree.c
index acf6b62..dd9cf65 100644
--- a/xen/drivers/passthrough/device_tree.c
+++ b/xen/drivers/passthrough/device_tree.c
@@ -158,22 +158,7 @@ int iommu_add_dt_device(struct dt_device_node *np)
* these callback implemented.
*/
if ( !ops->add_device || !ops->dt_xlate )
- {
- /*
- * Some Device Trees may expose both legacy SMMU and generic
- * IOMMU bindings together. However, the SMMU driver is only
- * supporting the former and will protect them during the
- * initialization. So we need to skip them and not return
- * error here.
- *
- * XXX: This can be dropped when the SMMU is able to deal
- * with generic bindings.
- */
- if ( dt_device_is_protected(np) )
- return 0;
- else
- return -EINVAL;
- }
+ return -EINVAL;
if ( !dt_device_is_available(iommu_spec.np) )
break;
--
2.7.4
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