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authorJean-Philippe Brucker <jean-philippe.brucker@arm.com>2019-04-17 21:24:46 +0300
committerWill Deacon <will.deacon@arm.com>2019-04-23 14:23:13 +0300
commit2a7e62f51696ad476b7fb8157d73307e20257df7 (patch)
tree09e6551cb4354b84ff10ae222abed026a06e4b83 /drivers/iommu
parent8be39a1a04c1491a6a408c1549dfd4e191f3a287 (diff)
downloadlinux-2a7e62f51696ad476b7fb8157d73307e20257df7.tar.xz
iommu/arm-smmu-v3: Link domains and devices
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> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/arm-smmu-v3.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 7b425483f4b6..3e7198ee9530 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -581,6 +581,7 @@ struct arm_smmu_device {
struct arm_smmu_master {
struct arm_smmu_device *smmu;
struct arm_smmu_domain *domain;
+ struct list_head domain_head;
u32 *sids;
unsigned int num_sids;
};
@@ -607,6 +608,9 @@ struct arm_smmu_domain {
};
struct iommu_domain domain;
+
+ struct list_head devices;
+ spinlock_t devices_lock;
};
struct arm_smmu_option_prop {
@@ -1504,6 +1508,9 @@ 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;
}
@@ -1721,9 +1728,16 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master)
static void arm_smmu_detach_dev(struct arm_smmu_master *master)
{
- if (!master->domain)
+ unsigned long flags;
+ struct arm_smmu_domain *smmu_domain = master->domain;
+
+ if (!smmu_domain)
return;
+ spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+ list_del(&master->domain_head);
+ spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+
master->domain = NULL;
arm_smmu_install_ste_for_dev(master);
}
@@ -1731,6 +1745,7 @@ static void arm_smmu_detach_dev(struct arm_smmu_master *master)
static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
{
int ret = 0;
+ unsigned long flags;
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
@@ -1764,6 +1779,10 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
master->domain = smmu_domain;
+ spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+ list_add(&master->domain_head, &smmu_domain->devices);
+ spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+
if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1)
arm_smmu_write_ctx_desc(smmu, &smmu_domain->s1_cfg);