[PATCH v4 2/5] iommu/s390: support cleanup of additional table regions

[Matthew Rosato <mjrosato@linux.ibm.com>]

Extend the existing dma_cleanup_tables to also handle region second and
region first tables.

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
 drivers/iommu/s390-iommu.c | 71 ++++++++++++++++++++++++++++++++++----
 1 file changed, 64 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index cad032d4c9a6..f2cda0ce0fe9 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -121,6 +121,22 @@ static inline int pt_entry_isvalid(unsigned long entry)
 	return (entry & ZPCI_PTE_VALID_MASK) == ZPCI_PTE_VALID;
 }
 
+static inline unsigned long *get_rf_rso(unsigned long entry)
+{
+	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RFX)
+		return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK);
+	else
+		return NULL;
+}
+
+static inline unsigned long *get_rs_rto(unsigned long entry)
+{
+	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RSX)
+		return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK);
+	else
+		return NULL;
+}
+
 static inline unsigned long *get_rt_sto(unsigned long entry)
 {
 	if ((entry & ZPCI_TABLE_TYPE_MASK) == ZPCI_TABLE_TYPE_RTX)
@@ -192,18 +208,59 @@ static void dma_free_seg_table(unsigned long entry)
 	dma_free_cpu_table(sto);
 }
 
-static void dma_cleanup_tables(unsigned long *table)
+static void dma_free_rt_table(unsigned long entry)
 {
+	unsigned long *rto = get_rs_rto(entry);
 	int rtx;
 
-	if (!table)
+	for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
+		if (reg_entry_isvalid(rto[rtx]))
+			dma_free_seg_table(rto[rtx]);
+
+	dma_free_cpu_table(rto);
+}
+
+static void dma_free_rs_table(unsigned long entry)
+{
+	unsigned long *rso = get_rf_rso(entry);
+	int rsx;
+
+	for (rsx = 0; rsx < ZPCI_TABLE_ENTRIES; rsx++)
+		if (reg_entry_isvalid(rso[rsx]))
+			dma_free_rt_table(rso[rsx]);
+
+	dma_free_cpu_table(rso);
+}
+
+static void dma_cleanup_tables(struct s390_domain *domain)
+{
+	int rtx, rsx, rfx;
+
+	if (!domain->dma_table)
 		return;
 
-	for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
-		if (reg_entry_isvalid(table[rtx]))
-			dma_free_seg_table(table[rtx]);
+	switch (domain->origin_type) {
+	case ZPCI_TABLE_TYPE_RFX:
+		for (rfx = 0; rfx < ZPCI_TABLE_ENTRIES; rfx++)
+			if (reg_entry_isvalid(domain->dma_table[rfx]))
+				dma_free_rs_table(domain->dma_table[rfx]);
+		break;
+	case ZPCI_TABLE_TYPE_RSX:
+		for (rsx = 0; rsx < ZPCI_TABLE_ENTRIES; rsx++)
+			if (reg_entry_isvalid(domain->dma_table[rsx]))
+				dma_free_rt_table(domain->dma_table[rsx]);
+		break;
+	case ZPCI_TABLE_TYPE_RTX:
+		for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
+			if (reg_entry_isvalid(domain->dma_table[rtx]))
+				dma_free_seg_table(domain->dma_table[rtx]);
+		break;
+	default:
+		WARN_ONCE(1, "Invalid IOMMU table (%x)\n", domain->origin_type);
+		return;
+	}
 
-	dma_free_cpu_table(table);
+	dma_free_cpu_table(domain->dma_table);
 }
 
 static unsigned long *dma_alloc_page_table(gfp_t gfp)
@@ -358,7 +415,7 @@ static void s390_iommu_rcu_free_domain(struct rcu_head *head)
 {
 	struct s390_domain *s390_domain = container_of(head, struct s390_domain, rcu);
 
-	dma_cleanup_tables(s390_domain->dma_table);
+	dma_cleanup_tables(s390_domain);
 	kfree(s390_domain);
 }
 
-- 
2.49.0