[PATCH RFC v1 08/11] iommu/arm-smmu-v3: Implement shared context alloc and free ops
Vivek Gautam
vivek.gautam at arm.com
Fri Apr 23 10:51:44 BST 2021
Implementing the alloc_shared_cd and free_shared_cd in cd-lib, and
start using them for arm-smmu-v3-sva implementation.
Signed-off-by: Vivek Gautam <vivek.gautam at arm.com>
---
.../arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c | 71 ++++++++--------
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 83 ++++++++-----------
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 -
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 14 ----
4 files changed, 73 insertions(+), 96 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
index 537b7c784d40..b87829796596 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-cd-lib.c
@@ -285,16 +285,14 @@ static bool arm_smmu_free_asid(struct xarray *xa, void *cookie_cd)
* descriptor is using it, try to replace it.
*/
static struct arm_smmu_ctx_desc *
-arm_smmu_share_asid(struct mm_struct *mm, u16 asid)
+arm_smmu_share_asid(struct iommu_pasid_table *tbl, struct mm_struct *mm,
+ struct xarray *xa, u16 asid, u32 asid_bits)
{
int ret;
u32 new_asid;
struct arm_smmu_ctx_desc *cd;
- struct arm_smmu_device *smmu;
- struct arm_smmu_domain *smmu_domain;
- struct iommu_pasid_table *tbl;
- cd = xa_load(&arm_smmu_asid_xa, asid);
+ cd = xa_load(xa, asid);
if (!cd)
return NULL;
@@ -306,12 +304,8 @@ arm_smmu_share_asid(struct mm_struct *mm, u16 asid)
return cd;
}
- smmu_domain = container_of(cd, struct arm_smmu_domain, s1_cfg.cd);
- smmu = smmu_domain->smmu;
- tbl = smmu_domain->tbl;
-
- ret = xa_alloc(&arm_smmu_asid_xa, &new_asid, cd,
- XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL);
+ ret = xa_alloc(xa, &new_asid, cd, XA_LIMIT(1, (1 << asid_bits) - 1),
+ GFP_KERNEL);
if (ret)
return ERR_PTR(-ENOSPC);
/*
@@ -325,48 +319,52 @@ arm_smmu_share_asid(struct mm_struct *mm, u16 asid)
* be some overlap between use of both ASIDs, until we invalidate the
* TLB.
*/
- ret = iommu_psdtable_write(tbl, &tbl->cfg, 0, cd);
+ ret = arm_smmu_write_ctx_desc(&tbl->cfg, 0, cd);
if (ret)
return ERR_PTR(-ENOSYS);
/* Invalidate TLB entries previously associated with that context */
- iommu_psdtable_flush_tlb(tbl, smmu_domain, asid);
+ iommu_psdtable_flush_tlb(tbl, tbl->cookie, asid);
- xa_erase(&arm_smmu_asid_xa, asid);
+ xa_erase(xa, asid);
return NULL;
}
-struct arm_smmu_ctx_desc *
-arm_smmu_alloc_shared_cd(struct iommu_pasid_table *tbl, struct mm_struct *mm)
+static struct iommu_psdtable_mmu_notifier *
+arm_smmu_alloc_shared_cd(struct iommu_pasid_table *tbl, struct mm_struct *mm,
+ struct xarray *xa, u32 asid_bits)
{
u16 asid;
int err = 0;
u64 tcr, par, reg;
struct arm_smmu_ctx_desc *cd;
struct arm_smmu_ctx_desc *ret = NULL;
+ struct iommu_psdtable_mmu_notifier *pst_mn;
asid = arm64_mm_context_get(mm);
if (!asid)
return ERR_PTR(-ESRCH);
+ pst_mn = kzalloc(sizeof(*pst_mn), GFP_KERNEL);
+ if (!pst_mn) {
+ err = -ENOMEM;
+ goto out_put_context;
+ }
+
cd = kzalloc(sizeof(*cd), GFP_KERNEL);
if (!cd) {
err = -ENOMEM;
- goto out_put_context;
+ goto out_free_mn;
}
refcount_set(&cd->refs, 1);
- mutex_lock(&arm_smmu_asid_lock);
- ret = arm_smmu_share_asid(mm, asid);
+ ret = arm_smmu_share_asid(tbl, mm, xa, asid, asid_bits);
if (ret) {
- mutex_unlock(&arm_smmu_asid_lock);
goto out_free_cd;
}
- err = xa_insert(&arm_smmu_asid_xa, asid, cd, GFP_KERNEL);
- mutex_unlock(&arm_smmu_asid_lock);
-
+ err = xa_insert(xa, asid, cd, GFP_KERNEL);
if (err)
goto out_free_asid;
@@ -406,21 +404,26 @@ arm_smmu_alloc_shared_cd(struct iommu_pasid_table *tbl, struct mm_struct *mm)
cd->asid = asid;
cd->mm = mm;
- return cd;
+ pst_mn->vendor.cd = cd;
+ return pst_mn;
out_free_asid:
- iommu_psdtable_free_asid(tbl, &arm_smmu_asid_xa, cd);
+ arm_smmu_free_asid(xa, cd);
out_free_cd:
kfree(cd);
+out_free_mn:
+ kfree(pst_mn);
out_put_context:
arm64_mm_context_put(mm);
return err < 0 ? ERR_PTR(err) : ret;
}
-void arm_smmu_free_shared_cd(struct iommu_pasid_table *tbl,
- struct arm_smmu_ctx_desc *cd)
+static void arm_smmu_free_shared_cd(struct iommu_pasid_table *tbl,
+ struct xarray *xa, void *cookie)
{
- if (iommu_psdtable_free_asid(tbl, &arm_smmu_asid_xa, cd)) {
+ struct arm_smmu_ctx_desc *cd = cookie;
+
+ if (iommu_psdtable_free_asid(tbl, xa, cd)) {
/* Unpin ASID */
arm64_mm_context_put(cd->mm);
kfree(cd);
@@ -428,11 +431,13 @@ void arm_smmu_free_shared_cd(struct iommu_pasid_table *tbl,
}
struct iommu_vendor_psdtable_ops arm_cd_table_ops = {
- .alloc = arm_smmu_alloc_cd_tables,
- .free = arm_smmu_free_cd_tables,
- .prepare = arm_smmu_prepare_cd,
- .write = arm_smmu_write_ctx_desc,
- .free_asid = arm_smmu_free_asid,
+ .alloc = arm_smmu_alloc_cd_tables,
+ .free = arm_smmu_free_cd_tables,
+ .prepare = arm_smmu_prepare_cd,
+ .write = arm_smmu_write_ctx_desc,
+ .free_asid = arm_smmu_free_asid,
+ .alloc_shared = arm_smmu_alloc_shared_cd,
+ .free_shared = arm_smmu_free_shared_cd,
};
struct iommu_pasid_table *
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 da35d4cc0c1e..ef28d0c409da 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
@@ -13,23 +13,12 @@
#include "../../io-pgtable-arm.h"
#include "../../iommu-pasid-table.h"
-struct arm_smmu_mmu_notifier {
- struct mmu_notifier mn;
- struct arm_smmu_ctx_desc *cd;
- bool cleared;
- refcount_t refs;
- struct list_head list;
- struct arm_smmu_domain *domain;
-};
-
-#define mn_to_smmu(mn) container_of(mn, struct arm_smmu_mmu_notifier, mn)
-
struct arm_smmu_bond {
- struct iommu_sva sva;
- struct mm_struct *mm;
- struct arm_smmu_mmu_notifier *smmu_mn;
- struct list_head list;
- refcount_t refs;
+ struct iommu_sva sva;
+ struct mm_struct *mm;
+ struct iommu_psdtable_mmu_notifier *smmu_mn;
+ struct list_head list;
+ refcount_t refs;
};
#define sva_to_bond(handle) \
@@ -41,20 +30,22 @@ static void arm_smmu_mm_invalidate_range(struct mmu_notifier *mn,
struct mm_struct *mm,
unsigned long start, unsigned long end)
{
- struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
- struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
+ struct iommu_psdtable_mmu_notifier *smmu_mn = mn_to_pstiommu(mn);
+ struct arm_smmu_domain *smmu_domain = smmu_mn->cookie;
+ struct arm_smmu_ctx_desc *cd = smmu_mn->vendor.cd;
size_t size = end - start + 1;
if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_BTM))
- arm_smmu_tlb_inv_range_asid(start, size, smmu_mn->cd->asid,
+ arm_smmu_tlb_inv_range_asid(start, size, cd->asid,
PAGE_SIZE, false, smmu_domain);
arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, start, size);
}
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 iommu_psdtable_mmu_notifier *smmu_mn = mn_to_pstiommu(mn);
+ struct arm_smmu_domain *smmu_domain = smmu_mn->cookie;
+ struct arm_smmu_ctx_desc *cd = smmu_mn->vendor.cd;
struct iommu_pasid_table *tbl = smmu_domain->tbl;
mutex_lock(&sva_lock);
@@ -69,7 +60,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
*/
iommu_psdtable_write(tbl, &tbl->cfg, mm->pasid, &quiet_cd);
- iommu_psdtable_flush_tlb(tbl, smmu_domain, smmu_mn->cd->asid);
+ iommu_psdtable_flush_tlb(tbl, smmu_domain, cd->asid);
arm_smmu_atc_inv_domain(smmu_domain, mm->pasid, 0, 0);
smmu_mn->cleared = true;
@@ -78,7 +69,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
{
- kfree(mn_to_smmu(mn));
+ kfree(mn_to_pstiommu(mn));
}
static struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
@@ -88,63 +79,59 @@ static struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
};
/* Allocate or get existing MMU notifier for this {domain, mm} pair */
-static struct arm_smmu_mmu_notifier *
+static struct iommu_psdtable_mmu_notifier *
arm_smmu_mmu_notifier_get(struct arm_smmu_domain *smmu_domain,
struct mm_struct *mm)
{
int ret;
- struct arm_smmu_ctx_desc *cd;
- struct arm_smmu_mmu_notifier *smmu_mn;
+ struct iommu_psdtable_mmu_notifier *smmu_mn;
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
struct iommu_pasid_table *tbl = smmu_domain->tbl;
- list_for_each_entry(smmu_mn, &smmu_domain->mmu_notifiers, list) {
+ list_for_each_entry(smmu_mn, &tbl->mmu_notifiers, list) {
if (smmu_mn->mn.mm == mm) {
refcount_inc(&smmu_mn->refs);
return smmu_mn;
}
}
- cd = arm_smmu_alloc_shared_cd(tbl, mm);
- if (IS_ERR(cd))
- return ERR_CAST(cd);
-
- smmu_mn = kzalloc(sizeof(*smmu_mn), GFP_KERNEL);
- if (!smmu_mn) {
- ret = -ENOMEM;
- goto err_free_cd;
- }
+ mutex_lock(&arm_smmu_asid_lock);
+ smmu_mn = iommu_psdtable_alloc_shared(tbl, mm, &arm_smmu_asid_xa,
+ smmu->asid_bits);
+ mutex_unlock(&arm_smmu_asid_lock);
+ if (IS_ERR(smmu_mn))
+ return ERR_CAST(smmu_mn);
refcount_set(&smmu_mn->refs, 1);
- smmu_mn->cd = cd;
- smmu_mn->domain = smmu_domain;
+ smmu_mn->cookie = smmu_domain;
smmu_mn->mn.ops = &arm_smmu_mmu_notifier_ops;
ret = mmu_notifier_register(&smmu_mn->mn, mm);
- if (ret) {
- kfree(smmu_mn);
+ if (ret)
goto err_free_cd;
- }
- ret = iommu_psdtable_write(tbl, &tbl->cfg, mm->pasid, cd);
+ ret = iommu_psdtable_write(tbl, &tbl->cfg, mm->pasid,
+ smmu_mn->vendor.cd);
if (ret)
goto err_put_notifier;
- list_add(&smmu_mn->list, &smmu_domain->mmu_notifiers);
+ list_add(&smmu_mn->list, &tbl->mmu_notifiers);
return smmu_mn;
err_put_notifier:
/* Frees smmu_mn */
mmu_notifier_put(&smmu_mn->mn);
err_free_cd:
- arm_smmu_free_shared_cd(tbl, cd);
+ iommu_psdtable_free_shared(tbl, &arm_smmu_asid_xa, smmu_mn->vendor.cd);
return ERR_PTR(ret);
}
-static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
+static void
+arm_smmu_mmu_notifier_put(struct iommu_psdtable_mmu_notifier *smmu_mn)
{
struct mm_struct *mm = smmu_mn->mn.mm;
- struct arm_smmu_ctx_desc *cd = smmu_mn->cd;
- struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
+ struct arm_smmu_ctx_desc *cd = smmu_mn->vendor.cd;
+ struct arm_smmu_domain *smmu_domain = smmu_mn->cookie;
struct iommu_pasid_table *tbl = smmu_domain->tbl;
if (!refcount_dec_and_test(&smmu_mn->refs))
@@ -164,7 +151,7 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
/* Frees smmu_mn */
mmu_notifier_put(&smmu_mn->mn);
- arm_smmu_free_shared_cd(tbl, cd);
+ iommu_psdtable_free_shared(tbl, &arm_smmu_asid_xa, cd);
}
static struct iommu_sva *
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 bbc4dc75de72..e55567b4d2f4 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1987,7 +1987,6 @@ 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);
- INIT_LIST_HEAD(&smmu_domain->mmu_notifiers);
return &smmu_domain->domain;
}
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 13ff024ab0d5..8a689b4316ac 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -737,8 +737,6 @@ struct arm_smmu_domain {
struct list_head devices;
spinlock_t devices_lock;
-
- struct list_head mmu_notifiers;
};
static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
@@ -773,10 +771,6 @@ struct iommu_sva *arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm,
void arm_smmu_sva_unbind(struct iommu_sva *handle);
u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle);
void arm_smmu_sva_notifier_synchronize(void);
-struct arm_smmu_ctx_desc *
-arm_smmu_alloc_shared_cd(struct iommu_pasid_table *tbl, struct mm_struct *mm);
-void arm_smmu_free_shared_cd(struct iommu_pasid_table *tbl,
- struct arm_smmu_ctx_desc *cd);
#else /* CONFIG_ARM_SMMU_V3_SVA */
static inline bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
{
@@ -832,13 +826,5 @@ static inline u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
}
static inline void arm_smmu_sva_notifier_synchronize(void) {}
-struct arm_smmu_ctx_desc *
-arm_smmu_alloc_shared_cd(struct iommu_pasid_table *tbl, struct mm_struct *mm)
-{
- return ERR_PTR(-EINVAL);
-}
-
-static inline void arm_smmu_free_shared_cd(struct iommu_pasid_table *tbl,
- struct arm_smmu_ctx_desc *cd) {}
#endif /* CONFIG_ARM_SMMU_V3_SVA */
#endif /* _ARM_SMMU_V3_H */
--
2.17.1
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