@@ -652,6 +652,11 @@ struct arm_smmu_device {
struct arm_smmu_master_data {
struct arm_smmu_device *smmu;
struct arm_smmu_strtab_ent ste;
+
+ struct arm_smmu_domain *domain;
+ struct list_head list; /* domain->devices */
+
+ struct device *dev;
};
/* SMMU private data for an IOMMU domain */
@@ -675,6 +680,9 @@ struct arm_smmu_domain {
};
struct iommu_domain domain;
+
+ struct list_head devices;
+ spinlock_t devices_lock;
};
struct arm_smmu_option_prop {
@@ -1540,6 +1548,9 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
}
mutex_init(&smmu_domain->init_mutex);
+ INIT_LIST_HEAD(&smmu_domain->devices);
+ spin_lock_init(&smmu_domain->devices_lock);
+
return &smmu_domain->domain;
}
@@ -1754,7 +1765,17 @@ static void arm_smmu_install_ste_for_dev(struct iommu_fwspec *fwspec)
static void arm_smmu_detach_dev(struct device *dev)
{
+ unsigned long flags;
struct arm_smmu_master_data *master = dev->iommu_fwspec->iommu_priv;
+ struct arm_smmu_domain *smmu_domain = master->domain;
+
+ if (smmu_domain) {
+ spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+ list_del(&master->list);
+ spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+
+ master->domain = NULL;
+ }
master->ste.assigned = false;
arm_smmu_install_ste_for_dev(dev->iommu_fwspec);
@@ -1763,6 +1784,7 @@ static void arm_smmu_detach_dev(struct device *dev)
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret = 0;
+ unsigned long flags;
struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
struct arm_smmu_master_data *master;
@@ -1798,6 +1820,11 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
}
ste->assigned = true;
+ master->domain = smmu_domain;
+
+ spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+ list_add(&master->list, &smmu_domain->devices);
+ spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
if (smmu_domain->stage == ARM_SMMU_DOMAIN_BYPASS) {
ste->s1_cfg = NULL;
@@ -1916,6 +1943,7 @@ static int arm_smmu_add_device(struct device *dev)
return -ENOMEM;
master->smmu = smmu;
+ master->dev = dev;
fwspec->iommu_priv = master;
}
When removing a mapping from a domain, we need to send an invalidation to all devices that might have stored it in their Address Translation Cache (ATC). In addition when updating the context descriptor of a live domain, we'll need to send invalidations for all devices attached to it. Maintain a list of devices in each domain, protected by a spinlock. It is updated every time we attach or detach devices to and from domains. It needs to be a spinlock because we'll invalidate ATC entries from within hardirq-safe contexts, but it may be possible to relax the read side with RCU later. Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> --- drivers/iommu/arm-smmu-v3.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)