[PATCH 13/27] iommu/arm-smmu-v3: Make smmu_domain->devices into an allocated list
Jason Gunthorpe
jgg at nvidia.com
Wed Oct 11 16:25:49 PDT 2023
The next patch will need to store the same master twice (with different
SSIDs), so allocate memory for each list element.
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 11 ++++--
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 38 +++++++++++++++++--
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 7 +++-
3 files changed, 47 insertions(+), 9 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index aeacf2fb317a72..0a2339d9e518ac 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -40,12 +40,13 @@ static DEFINE_MUTEX(sva_lock);
static void
arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
{
- struct arm_smmu_master *master;
+ struct arm_smmu_master_domain *master_domain;
struct arm_smmu_cd target_cd;
unsigned long flags;
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
- list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+ list_for_each_entry(master_domain, &smmu_domain->devices, devices_elm) {
+ struct arm_smmu_master *master = master_domain->master;
struct arm_smmu_cd *cdptr;
/* S1 domains only support RID attachment right now */
@@ -291,7 +292,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
{
struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
- struct arm_smmu_master *master;
+ struct arm_smmu_master_domain *master_domain;
unsigned long flags;
mutex_lock(&sva_lock);
@@ -305,7 +306,9 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
* but disable translation.
*/
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
- list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+ list_for_each_entry(master_domain, &smmu_domain->devices,
+ devices_elm) {
+ struct arm_smmu_master *master = master_domain->master;
struct arm_smmu_cd target;
struct arm_smmu_cd *cdptr;
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 894add54013fe9..82613f5d24f478 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1944,10 +1944,10 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
unsigned long iova, size_t size)
{
+ struct arm_smmu_master_domain *master_domain;
int i;
unsigned long flags;
struct arm_smmu_cmdq_ent cmd;
- struct arm_smmu_master *master;
struct arm_smmu_cmdq_batch cmds;
if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_ATS))
@@ -1975,7 +1975,10 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
cmds.num = 0;
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
- list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+ list_for_each_entry(master_domain, &smmu_domain->devices,
+ devices_elm) {
+ struct arm_smmu_master *master = master_domain->master;
+
if (!master->ats_enabled)
continue;
@@ -2464,10 +2467,27 @@ static void arm_smmu_disable_pasid(struct arm_smmu_master *master)
pci_disable_pasid(pdev);
}
+static struct arm_smmu_master_domain *
+arm_smmu_find_master_domain(struct arm_smmu_domain *smmu_domain,
+ struct arm_smmu_master *master)
+{
+ struct arm_smmu_master_domain *master_domain;
+
+ lockdep_assert_held(&smmu_domain->devices_lock);
+
+ list_for_each_entry(master_domain, &smmu_domain->devices,
+ devices_elm) {
+ if (master_domain->master == master)
+ return master_domain;
+ }
+ return NULL;
+}
+
static void arm_smmu_detach_dev(struct arm_smmu_master *master)
{
struct arm_smmu_domain *smmu_domain =
to_smmu_domain_safe(iommu_get_domain_for_dev(master->dev));
+ struct arm_smmu_master_domain *master_domain;
unsigned long flags;
if (!smmu_domain)
@@ -2476,7 +2496,11 @@ static void arm_smmu_detach_dev(struct arm_smmu_master *master)
arm_smmu_disable_ats(master, smmu_domain);
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
- list_del(&master->domain_head);
+ master_domain = arm_smmu_find_master_domain(smmu_domain, master);
+ if (master_domain) {
+ list_del(&master_domain->devices_elm);
+ kfree(master_domain);
+ }
spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
master->ats_enabled = false;
@@ -2490,6 +2514,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
struct arm_smmu_device *smmu;
struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ struct arm_smmu_master_domain *master_domain;
struct arm_smmu_master *master;
struct arm_smmu_cd *cdptr;
@@ -2526,6 +2551,11 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
return -ENOMEM;
}
+ master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL);
+ if (!master_domain)
+ return -ENOMEM;
+ master_domain->master = master;
+
/*
* Prevent arm_smmu_share_asid() from trying to change the ASID
* of either the old or new domain while we are working on it.
@@ -2539,7 +2569,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
master->ats_enabled = arm_smmu_ats_supported(master);
spin_lock_irqsave(&smmu_domain->devices_lock, flags);
- list_add(&master->domain_head, &smmu_domain->devices);
+ list_add(&master_domain->devices_elm, &smmu_domain->devices);
spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
switch (smmu_domain->stage) {
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 6d22a9f4c33a0b..a4da5c164dc62a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -695,7 +695,6 @@ struct arm_smmu_stream {
struct arm_smmu_master {
struct arm_smmu_device *smmu;
struct device *dev;
- struct list_head domain_head;
struct arm_smmu_stream *streams;
/* Locked by the iommu core using the group mutex */
struct arm_smmu_ctx_desc_cfg cd_table;
@@ -729,12 +728,18 @@ struct arm_smmu_domain {
struct iommu_domain domain;
+ /* List of struct arm_smmu_master_domain */
struct list_head devices;
spinlock_t devices_lock;
struct list_head mmu_notifiers;
};
+struct arm_smmu_master_domain {
+ struct list_head devices_elm;
+ struct arm_smmu_master *master;
+};
+
static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
{
return container_of(dom, struct arm_smmu_domain, domain);
--
2.42.0
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