iommu/amd: Make amd_iommu_domain_flush_complete() static

AMD driver uses amd_iommu_domain_flush_complete() function to make sure
IOMMU processed invalidation commands before proceeding. Ideally this
should be called from functions which updates DTE/invalidates caches.
There is no need to call this function explicitly. This patches makes
below changes :

- Rename amd_iommu_domain_flush_complete() -> domain_flush_complete()
  and make it as static function.

- Rearrage domain_flush_complete() to avoid forward declaration.

- Update amd_iommu_update_and_flush_device_table() to call
  domain_flush_complete().

Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20240828111029.5429-7-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: hegdevasant

drivers/iommu/amd/amd_iommu.h

@@ -88,7 +88,6 @@ void amd_iommu_flush_all_caches(struct amd_iommu *iommu);
 void amd_iommu_update_and_flush_device_table(struct protection_domain *domain);
 void amd_iommu_domain_update(struct protection_domain *domain);
 void amd_iommu_dev_update_dte(struct iommu_dev_data *dev_data, bool set);
-void amd_iommu_domain_flush_complete(struct protection_domain *domain);
 void amd_iommu_domain_flush_pages(struct protection_domain *domain,
 				  u64 address, size_t size);
 void amd_iommu_dev_flush_pasid_pages(struct iommu_dev_data *dev_data,

drivers/iommu/amd/io_pgtable.c

@@ -175,7 +175,6 @@ static bool increase_address_space(struct protection_domain *domain,
 	domain->iop.root  = pte;
 	domain->iop.mode += 1;
 	amd_iommu_update_and_flush_device_table(domain);
-	amd_iommu_domain_flush_complete(domain);
 
 	/*
 	 * Device Table needs to be updated and flushed before the new root can

drivers/iommu/amd/iommu.c

@@ -1249,6 +1249,22 @@ static int iommu_completion_wait(struct amd_iommu *iommu)
 	return ret;
 }
 
+static void domain_flush_complete(struct protection_domain *domain)
+{
+	int i;
+
+	for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
+		if (domain && !domain->dev_iommu[i])
+			continue;
+
+		/*
+		 * Devices of this domain are behind this IOMMU
+		 * We need to wait for completion of all commands.
+		 */
+		iommu_completion_wait(amd_iommus[i]);
+	}
+}
+
 static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
 {
 	struct iommu_cmd cmd;
@@ -1485,7 +1501,7 @@ void amd_iommu_domain_flush_pages(struct protection_domain *domain,
 		__domain_flush_pages(domain, address, size);
 
 		/* Wait until IOMMU TLB and all device IOTLB flushes are complete */
-		amd_iommu_domain_flush_complete(domain);
+		domain_flush_complete(domain);
 
 		return;
 	}
@@ -1525,7 +1541,7 @@ void amd_iommu_domain_flush_pages(struct protection_domain *domain,
 	}
 
 	/* Wait until IOMMU TLB and all device IOTLB flushes are complete */
-	amd_iommu_domain_flush_complete(domain);
+	domain_flush_complete(domain);
 }
 
 /* Flush the whole IO/TLB for a given protection domain - including PDE */
@@ -1558,22 +1574,6 @@ static void dev_flush_pasid_all(struct iommu_dev_data *dev_data,
 					CMD_INV_IOMMU_ALL_PAGES_ADDRESS, pasid);
 }
 
-void amd_iommu_domain_flush_complete(struct protection_domain *domain)
-{
-	int i;
-
-	for (i = 0; i < amd_iommu_get_num_iommus(); ++i) {
-		if (domain && !domain->dev_iommu[i])
-			continue;
-
-		/*
-		 * Devices of this domain are behind this IOMMU
-		 * We need to wait for completion of all commands.
-		 */
-		iommu_completion_wait(amd_iommus[i]);
-	}
-}
-
 /* Flush the not present cache if it exists */
 static void domain_flush_np_cache(struct protection_domain *domain,
 		dma_addr_t iova, size_t size)
@@ -1615,6 +1615,7 @@ void amd_iommu_update_and_flush_device_table(struct protection_domain *domain)
 {
 	update_device_table(domain);
 	domain_flush_devices(domain);
+	domain_flush_complete(domain);
 }
 
 void amd_iommu_domain_update(struct protection_domain *domain)