iommu/arm-smmu-v3: Expose the arm_smmu_attach interface

The arm-smmuv3-iommufd.c file will need to call these functions too.
Remove statics and put them in the header file. Remove the kunit
visibility protections from arm_smmu_make_abort_ste() and
arm_smmu_make_s2_domain_ste().

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Donald Dutile <ddutile@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/7-v4-9e99b76f3518+3a8-smmuv3_nesting_jgg@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: jgunthorpe

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -1549,7 +1549,6 @@ static void arm_smmu_write_ste(struct arm_smmu_master *master, u32 sid,
 	}
 }
 
-VISIBLE_IF_KUNIT
 void arm_smmu_make_abort_ste(struct arm_smmu_ste *target)
 {
 	memset(target, 0, sizeof(*target));
@@ -1632,7 +1631,6 @@ void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
 }
 EXPORT_SYMBOL_IF_KUNIT(arm_smmu_make_cdtable_ste);
 
-VISIBLE_IF_KUNIT
 void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
 				 struct arm_smmu_master *master,
 				 struct arm_smmu_domain *smmu_domain,
@@ -2505,8 +2503,8 @@ arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid)
 	}
 }
 
-static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master,
-					 const struct arm_smmu_ste *target)
+void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master,
+				  const struct arm_smmu_ste *target)
 {
 	int i, j;
 	struct arm_smmu_device *smmu = master->smmu;
@@ -2671,16 +2669,6 @@ static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 }
 
-struct arm_smmu_attach_state {
-	/* Inputs */
-	struct iommu_domain *old_domain;
-	struct arm_smmu_master *master;
-	bool cd_needs_ats;
-	ioasid_t ssid;
-	/* Resulting state */
-	bool ats_enabled;
-};
-
 /*
  * Start the sequence to attach a domain to a master. The sequence contains three
  * steps:
@@ -2701,8 +2689,8 @@ struct arm_smmu_attach_state {
  * new_domain can be a non-paging domain. In this case ATS will not be enabled,
  * and invalidations won't be tracked.
  */
-static int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
-				   struct iommu_domain *new_domain)
+int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
+			    struct iommu_domain *new_domain)
 {
 	struct arm_smmu_master *master = state->master;
 	struct arm_smmu_master_domain *master_domain;
@@ -2784,7 +2772,7 @@ static int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
  * completes synchronizing the PCI device's ATC and finishes manipulating the
  * smmu_domain->devices list.
  */
-static void arm_smmu_attach_commit(struct arm_smmu_attach_state *state)
+void arm_smmu_attach_commit(struct arm_smmu_attach_state *state)
 {
 	struct arm_smmu_master *master = state->master;
 

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h

@@ -830,21 +830,22 @@ struct arm_smmu_entry_writer_ops {
 	void (*sync)(struct arm_smmu_entry_writer *writer);
 };
 
+void arm_smmu_make_abort_ste(struct arm_smmu_ste *target);
+void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
+				 struct arm_smmu_master *master,
+				 struct arm_smmu_domain *smmu_domain,
+				 bool ats_enabled);
+
 #if IS_ENABLED(CONFIG_KUNIT)
 void arm_smmu_get_ste_used(const __le64 *ent, __le64 *used_bits);
 void arm_smmu_write_entry(struct arm_smmu_entry_writer *writer, __le64 *cur,
 			  const __le64 *target);
 void arm_smmu_get_cd_used(const __le64 *ent, __le64 *used_bits);
-void arm_smmu_make_abort_ste(struct arm_smmu_ste *target);
 void arm_smmu_make_bypass_ste(struct arm_smmu_device *smmu,
 			      struct arm_smmu_ste *target);
 void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
 			       struct arm_smmu_master *master, bool ats_enabled,
 			       unsigned int s1dss);
-void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
-				 struct arm_smmu_master *master,
-				 struct arm_smmu_domain *smmu_domain,
-				 bool ats_enabled);
 void arm_smmu_make_sva_cd(struct arm_smmu_cd *target,
 			  struct arm_smmu_master *master, struct mm_struct *mm,
 			  u16 asid);
@@ -902,6 +903,22 @@ static inline bool arm_smmu_master_canwbs(struct arm_smmu_master *master)
 	       IOMMU_FWSPEC_PCI_RC_CANWBS;
 }
 
+struct arm_smmu_attach_state {
+	/* Inputs */
+	struct iommu_domain *old_domain;
+	struct arm_smmu_master *master;
+	bool cd_needs_ats;
+	ioasid_t ssid;
+	/* Resulting state */
+	bool ats_enabled;
+};
+
+int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
+			    struct iommu_domain *new_domain);
+void arm_smmu_attach_commit(struct arm_smmu_attach_state *state);
+void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master,
+				  const struct arm_smmu_ste *target);
+
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
 bool arm_smmu_master_sva_supported(struct arm_smmu_master *master);