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iommu/vt-d: Remove domain_update_iommu_snooping()

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The IOMMU force snooping capability is not required to be consistent
among all the IOMMUs anymore. Remove force snooping capability check
in the IOMMU hot-add path and domain_update_iommu_snooping() becomes
a dead code now.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20220508123525.1973626-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20220510023407.2759143-8-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2022-05-10 10:34:06 +08:00 committed by Joerg Roedel
parent fc0051cb95
commit e80552267b
1 changed files with 1 additions and 33 deletions
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34
drivers/iommu/intel/iommu.c
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@ -533,33 +533,6 @@ static void domain_update_iommu_coherency(struct dmar_domain *domain)
rcu_read_unlock();
}
static bool domain_update_iommu_snooping(struct intel_iommu *skip)
{
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
bool ret = true;
rcu_read_lock();
for_each_active_iommu(iommu, drhd) {
if (iommu != skip) {
/*
* If the hardware is operating in the scalable mode,
* the snooping control is always supported since we
* always set PASID-table-entry.PGSNP bit if the domain
* is managed outside (UNMANAGED).
*/
if (!sm_supported(iommu) &&
!ecap_sc_support(iommu->ecap)) {
ret = false;
break;
}
}
}
rcu_read_unlock();
return ret;
}
static int domain_update_iommu_superpage(struct dmar_domain *domain,
struct intel_iommu *skip)
{
@ -3572,12 +3545,7 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
iommu->name);
return -ENXIO;
}
if (!ecap_sc_support(iommu->ecap) &&
domain_update_iommu_snooping(iommu)) {
pr_warn("%s: Doesn't support snooping.\n",
iommu->name);
return -ENXIO;
}
sp = domain_update_iommu_superpage(NULL, iommu) - 1;
if (sp >= 0 && !(cap_super_page_val(iommu->cap) & (1 << sp))) {
pr_warn("%s: Doesn't support large page.\n",