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[v5,5/5] iommu/virtio: Enable x86 support

Message ID 20210618152059.1194210-6-jean-philippe@linaro.org
State Accepted
Commit 8ce4904bfd22de04ac3cd35d469c0a3337bdeb7b
Headers show
Series Add support for ACPI VIOT | expand

Commit Message

Jean-Philippe Brucker June 18, 2021, 3:21 p.m. UTC 
With the VIOT support in place, x86 platforms can now use the
virtio-iommu.

Because the other x86 IOMMU drivers aren't yet ready to use the
acpi_dma_setup() path, x86 doesn't implement arch_setup_dma_ops() at the
moment. Similarly to Vt-d and AMD IOMMU, clear the DMA ops and call
iommu_setup_dma_ops() from probe_finalize().

Acked-by: Joerg Roedel <jroedel@suse.de>

Acked-by: Michael S. Tsirkin <mst@redhat.com>

Tested-by: Eric Auger <eric.auger@redhat.com>

Reviewed-by: Eric Auger <eric.auger@redhat.com>

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

---
 drivers/iommu/Kconfig        |  3 ++-
 drivers/iommu/dma-iommu.c    |  1 +
 drivers/iommu/virtio-iommu.c | 11 +++++++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

-- 
2.32.0
diff mbox series

Patch

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index aff8a4830dd1..07b7c25cbed8 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -400,8 +400,9 @@  config HYPERV_IOMMU
 config VIRTIO_IOMMU
 	tristate "Virtio IOMMU driver"
 	depends on VIRTIO
-	depends on ARM64
+	depends on (ARM64 || X86)
 	select IOMMU_API
+	select IOMMU_DMA
 	select INTERVAL_TREE
 	select ACPI_VIOT if ACPI
 	help
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index c62e19bed302..9dbbc95c8189 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1330,6 +1330,7 @@  void iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 dma_limit)
 	 pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n",
 		 dev_name(dev));
 }
+EXPORT_SYMBOL_GPL(iommu_setup_dma_ops);
 
 static struct iommu_dma_msi_page *iommu_dma_get_msi_page(struct device *dev,
 		phys_addr_t msi_addr, struct iommu_domain *domain)
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index c6e5ee4d9cef..fe581f0c9b3a 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -10,6 +10,7 @@ 
 #include <linux/amba/bus.h>
 #include <linux/delay.h>
 #include <linux/dma-iommu.h>
+#include <linux/dma-map-ops.h>
 #include <linux/freezer.h>
 #include <linux/interval_tree.h>
 #include <linux/iommu.h>
@@ -904,6 +905,15 @@  static struct iommu_device *viommu_probe_device(struct device *dev)
 	return ERR_PTR(ret);
 }
 
+static void viommu_probe_finalize(struct device *dev)
+{
+#ifndef CONFIG_ARCH_HAS_SETUP_DMA_OPS
+	/* First clear the DMA ops in case we're switching from a DMA domain */
+	set_dma_ops(dev, NULL);
+	iommu_setup_dma_ops(dev, 0, U64_MAX);
+#endif
+}
+
 static void viommu_release_device(struct device *dev)
 {
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
@@ -940,6 +950,7 @@  static struct iommu_ops viommu_ops = {
 	.iova_to_phys		= viommu_iova_to_phys,
 	.iotlb_sync		= viommu_iotlb_sync,
 	.probe_device		= viommu_probe_device,
+	.probe_finalize		= viommu_probe_finalize,
 	.release_device		= viommu_release_device,
 	.device_group		= viommu_device_group,
 	.get_resv_regions	= viommu_get_resv_regions,