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iommu/msm: Implement an IDENTITY domain

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What msm does during msm_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/14-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 10:43:47 -03:00 committed by Joerg Roedel
parent bbe39b7633
commit 78fc30b4bb
1 changed files with 19 additions and 4 deletions
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23
drivers/iommu/msm_iommu.c
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@ -443,15 +443,20 @@ fail:
return ret;
}
static void msm_iommu_set_platform_dma(struct device *dev)
static int msm_iommu_identity_attach(struct iommu_domain *identity_domain,
struct device *dev)
{
struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
struct msm_priv *priv = to_msm_priv(domain);
struct msm_priv *priv;
unsigned long flags;
struct msm_iommu_dev *iommu;
struct msm_iommu_ctx_dev *master;
int ret;
int ret = 0;
if (domain == identity_domain || !domain)
return 0;
priv = to_msm_priv(domain);
free_io_pgtable_ops(priv->iop);
spin_lock_irqsave(&msm_iommu_lock, flags);
@ -468,8 +473,18 @@ static void msm_iommu_set_platform_dma(struct device *dev)
}
fail:
spin_unlock_irqrestore(&msm_iommu_lock, flags);
return ret;
}
static struct iommu_domain_ops msm_iommu_identity_ops = {
.attach_dev = msm_iommu_identity_attach,
};
static struct iommu_domain msm_iommu_identity_domain = {
.type = IOMMU_DOMAIN_IDENTITY,
.ops = &msm_iommu_identity_ops,
};
static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t pa, size_t pgsize, size_t pgcount,
int prot, gfp_t gfp, size_t *mapped)
@ -675,10 +690,10 @@ fail:
}
static struct iommu_ops msm_iommu_ops = {
.identity_domain = &msm_iommu_identity_domain,
.domain_alloc = msm_iommu_domain_alloc,
.probe_device = msm_iommu_probe_device,
.device_group = generic_device_group,
.set_platform_dma_ops = msm_iommu_set_platform_dma,
.pgsize_bitmap = MSM_IOMMU_PGSIZES,
.of_xlate = qcom_iommu_of_xlate,
.default_domain_ops = &(const struct iommu_domain_ops) {