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iommu/arm-smmu: Convert to domain_alloc_paging()

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Now that the BLOCKED and IDENTITY behaviors are managed with their own
domains change to the domain_alloc_paging() op.

The check for using_legacy_binding is now redundant,
arm_smmu_def_domain_type() always returns IOMMU_DOMAIN_IDENTITY for this
mode, so the core code will never attempt to create a DMA domain in the
first place.

Since commit a4fdd97622 ("iommu: Use flush queue capability") the core
code only passes in IDENTITY/BLOCKED/UNMANAGED/DMA domain types. It will
not pass in IDENTITY or BLOCKED if the global statics exist, so the test
for DMA is also redundant now too.

Call arm_smmu_init_domain_context() early if a dev is available.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/5-v2-c86cc8c2230e+160bb-smmu_newapi_jgg@nvidia.com
[will: Simplify arm_smmu_domain_alloc_paging() since 'cfg' cannot be NULL]
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Jason Gunthorpe 2023-10-17 15:11:44 -03:00 committed by Will Deacon
parent e0976331ad
commit 9b3febc3a3
1 changed files with 11 additions and 6 deletions
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17
drivers/iommu/arm/arm-smmu/arm-smmu.c
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@ -859,14 +859,10 @@ static void arm_smmu_destroy_domain_context(struct arm_smmu_domain *smmu_domain)
arm_smmu_rpm_put(smmu);
}
static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
{
struct arm_smmu_domain *smmu_domain;
if (type != IOMMU_DOMAIN_UNMANAGED) {
if (using_legacy_binding || type != IOMMU_DOMAIN_DMA)
return NULL;
}
/*
* Allocate the domain and initialise some of its data structures.
* We can't really do anything meaningful until we've added a
@ -879,6 +875,15 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
mutex_init(&smmu_domain->init_mutex);
spin_lock_init(&smmu_domain->cb_lock);
if (dev) {
struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
if (arm_smmu_init_domain_context(smmu_domain, cfg->smmu, dev)) {
kfree(smmu_domain);
return NULL;
}
}
return &smmu_domain->domain;
}
@ -1603,7 +1608,7 @@ static struct iommu_ops arm_smmu_ops = {
.identity_domain = &arm_smmu_identity_domain,
.blocked_domain = &arm_smmu_blocked_domain,
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
.domain_alloc_paging = arm_smmu_domain_alloc_paging,
.probe_device = arm_smmu_probe_device,
.release_device = arm_smmu_release_device,
.probe_finalize = arm_smmu_probe_finalize,