iommu/amd: Tidy up DMA ops init

Now that DMA ops are part of the core API via iommu-dma, fold the
vestigial remains of the IOMMU_DMA_OPS init state into the IOMMU API
phase, and clean up a few other leftovers. This should also close the
race window wherein bus_set_iommu() effectively makes the DMA ops state
visible before its nominal initialisation - it seems this was previously
fairly benign, but since commit a250c23f15 ("iommu: remove
DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE") it can now lead to the strict flush
queue policy inadvertently being picked for default domains allocated
during that window, with a corresponding unexpected perfomance impact.

Reported-by: Jussi Maki <joamaki@gmail.com>
Tested-by: Jussi Maki <joamaki@gmail.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Fixes: a250c23f15 ("iommu: remove DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE")
Link: https://lore.kernel.org/r/665db61e23ff8d54ac5eb391bef520b3a803fcb9.1622727974.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/amd_iommu.h

@@ -11,8 +11,6 @@
 
 #include "amd_iommu_types.h"
 
-extern int amd_iommu_init_dma_ops(void);
-extern int amd_iommu_init_passthrough(void);
 extern irqreturn_t amd_iommu_int_thread(int irq, void *data);
 extern irqreturn_t amd_iommu_int_handler(int irq, void *data);
 extern void amd_iommu_apply_erratum_63(u16 devid);

drivers/iommu/amd/init.c

@@ -231,7 +231,6 @@ enum iommu_init_state {
 	IOMMU_ENABLED,
 	IOMMU_PCI_INIT,
 	IOMMU_INTERRUPTS_EN,
-	IOMMU_DMA_OPS,
 	IOMMU_INITIALIZED,
 	IOMMU_NOT_FOUND,
 	IOMMU_INIT_ERROR,
@@ -2895,10 +2894,6 @@ static int __init state_next(void)
 		init_state = ret ? IOMMU_INIT_ERROR : IOMMU_INTERRUPTS_EN;
 		break;
 	case IOMMU_INTERRUPTS_EN:
-		ret = amd_iommu_init_dma_ops();
-		init_state = ret ? IOMMU_INIT_ERROR : IOMMU_DMA_OPS;
-		break;
-	case IOMMU_DMA_OPS:
 		init_state = IOMMU_INITIALIZED;
 		break;
 	case IOMMU_INITIALIZED:

drivers/iommu/amd/iommu.c

@@ -30,7 +30,6 @@
 #include <linux/msi.h>
 #include <linux/irqdomain.h>
 #include <linux/percpu.h>
-#include <linux/iova.h>
 #include <linux/io-pgtable.h>
 #include <asm/irq_remapping.h>
 #include <asm/io_apic.h>
@@ -1773,13 +1772,22 @@ void amd_iommu_domain_update(struct protection_domain *domain)
 	amd_iommu_domain_flush_complete(domain);
 }
 
+static void __init amd_iommu_init_dma_ops(void)
+{
+	swiotlb = (iommu_default_passthrough() || sme_me_mask) ? 1 : 0;
+
+	if (amd_iommu_unmap_flush)
+		pr_info("IO/TLB flush on unmap enabled\n");
+	else
+		pr_info("Lazy IO/TLB flushing enabled\n");
+	iommu_set_dma_strict(amd_iommu_unmap_flush);
+}
+
 int __init amd_iommu_init_api(void)
 {
-	int ret, err = 0;
+	int err = 0;
 
-	ret = iova_cache_get();
-	if (ret)
-		return ret;
+	amd_iommu_init_dma_ops();
 
 	err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
 	if (err)
@@ -1796,19 +1804,6 @@ int __init amd_iommu_init_api(void)
 	return 0;
 }
 
-int __init amd_iommu_init_dma_ops(void)
-{
-	swiotlb        = (iommu_default_passthrough() || sme_me_mask) ? 1 : 0;
-
-	if (amd_iommu_unmap_flush)
-		pr_info("IO/TLB flush on unmap enabled\n");
-	else
-		pr_info("Lazy IO/TLB flushing enabled\n");
-	iommu_set_dma_strict(amd_iommu_unmap_flush);
-	return 0;
-
-}
-
 /*****************************************************************************
  *
  * The following functions belong to the exported interface of AMD IOMMU