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iommu/omap: Implement an IDENTITY domain

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What omap does during omap_iommu_set_platform_dma() is actually putting
the iommu into identity mode.

Move to the new core support for ARM_DMA_USE_IOMMU by defining
ops->identity_domain.

This driver does not support IOMMU_DOMAIN_DMA, however it cannot be
compiled on ARM64 either. Most likely it is fine to support dma-iommu.c

Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/13-v8-81230027b2fa+9d-iommu_all_defdom_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Jason Gunthorpe 2023-09-13 10:43:46 -03:00 committed by Joerg Roedel
parent f128094f34
commit bbe39b7633
1 changed files with 18 additions and 3 deletions
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21
drivers/iommu/omap-iommu.c
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@ -1555,16 +1555,31 @@ static void _omap_iommu_detach_dev(struct omap_iommu_domain *omap_domain,
omap_domain->dev = NULL;
}
static void omap_iommu_set_platform_dma(struct device *dev)
static int omap_iommu_identity_attach(struct iommu_domain *identity_domain,
struct device *dev)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
struct omap_iommu_domain *omap_domain = to_omap_domain(domain);
struct omap_iommu_domain *omap_domain;
if (domain == identity_domain || !domain)
return 0;
omap_domain = to_omap_domain(domain);
spin_lock(&omap_domain->lock);
_omap_iommu_detach_dev(omap_domain, dev);
spin_unlock(&omap_domain->lock);
return 0;
}
static struct iommu_domain_ops omap_iommu_identity_ops = {
.attach_dev = omap_iommu_identity_attach,
};
static struct iommu_domain omap_iommu_identity_domain = {
.type = IOMMU_DOMAIN_IDENTITY,
.ops = &omap_iommu_identity_ops,
};
static struct iommu_domain *omap_iommu_domain_alloc(unsigned type)
{
struct omap_iommu_domain *omap_domain;
@ -1732,11 +1747,11 @@ static struct iommu_group *omap_iommu_device_group(struct device *dev)
}
static const struct iommu_ops omap_iommu_ops = {
.identity_domain = &omap_iommu_identity_domain,
.domain_alloc = omap_iommu_domain_alloc,
.probe_device = omap_iommu_probe_device,
.release_device = omap_iommu_release_device,
.device_group = omap_iommu_device_group,
.set_platform_dma_ops = omap_iommu_set_platform_dma,
.pgsize_bitmap = OMAP_IOMMU_PGSIZES,
.default_domain_ops = &(const struct iommu_domain_ops) {
.attach_dev = omap_iommu_attach_dev,