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iommu/virtio: Enable x86 support

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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>
Link: https://lore.kernel.org/r/20210618152059.1194210-6-jean-philippe@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jean-Philippe Brucker 2021-06-18 17:21:00 +02:00 committed by Joerg Roedel
parent ac6d704679
commit 8ce4904bfd
3 changed files with 14 additions and 1 deletions
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3
drivers/iommu/Kconfig
View File

@ -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

1
drivers/iommu/dma-iommu.c
View File

@ -1330,6 +1330,7 @@ out_err:
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)

11
drivers/iommu/virtio-iommu.c
View File

@ -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 @@ err_free_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,