iommu/amd: Allocate iova_domain for dma_ops_domain

Use it later for allocating the IO virtual addresses.
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu.c

@@ -39,6 +39,7 @@
 #include <linux/dma-contiguous.h>
 #include <linux/irqdomain.h>
 #include <linux/percpu.h>
+#include <linux/iova.h>
 #include <asm/irq_remapping.h>
 #include <asm/io_apic.h>
 #include <asm/apic.h>
@@ -57,6 +58,11 @@
 
 #define LOOP_TIMEOUT	100000
 
+/* IO virtual address start page frame number */
+#define IOVA_START_PFN		(1)
+#define IOVA_PFN(addr)		((addr) >> PAGE_SHIFT)
+#define DMA_32BIT_PFN		IOVA_PFN(DMA_BIT_MASK(32))
+
 /*
  * This bitmap is used to advertise the page sizes our hardware support
  * to the IOMMU core, which will then use this information to split
@@ -158,6 +164,9 @@ struct dma_ops_domain {
 
 	/* address space relevant data */
 	struct aperture_range *aperture[APERTURE_MAX_RANGES];
+
+	/* IOVA RB-Tree */
+	struct iova_domain iovad;
 };
 
 /****************************************************************************
@@ -1969,6 +1978,8 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom)
 	if (!dom)
 		return;
 
+	put_iova_domain(&dom->iovad);
+
 	free_percpu(dom->next_index);
 
 	del_domain_from_list(&dom->domain);
@@ -2044,6 +2055,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(void)
 	for_each_possible_cpu(cpu)
 		*per_cpu_ptr(dma_dom->next_index, cpu) = 0;
 
+	init_iova_domain(&dma_dom->iovad, PAGE_SIZE,
+			 IOVA_START_PFN, DMA_32BIT_PFN);
+
 	return dma_dom;
 
 free_dma_dom:
@@ -2951,7 +2965,11 @@ static struct dma_map_ops amd_iommu_dma_ops = {
 
 int __init amd_iommu_init_api(void)
 {
-	int err = 0;
+	int ret, err = 0;
+
+	ret = iova_cache_get();
+	if (ret)
+		return ret;
 
 	err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
 	if (err)