From c97d1b20d3835178bcd0e3a86c20ce4e36b6d80c Mon Sep 17 00:00:00 2001 From: Yi Liu Date: Thu, 28 Sep 2023 00:15:28 -0700 Subject: iommu/vt-d: Add domain_alloc_user op Add the domain_alloc_user() op implementation. It supports allocating domains to be used as parent under nested translation. Unlike other drivers VT-D uses only a single page table format so it only needs to check if the HW can support nesting. Link: https://lore.kernel.org/r/20230928071528.26258-7-yi.l.liu@intel.com Signed-off-by: Yi Liu Reviewed-by: Lu Baolu Reviewed-by: Kevin Tian Signed-off-by: Jason Gunthorpe --- drivers/iommu/intel/iommu.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'drivers/iommu/intel/iommu.c') diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 5db283c17e0d..017aed5813d8 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4074,6 +4074,33 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) return NULL; } +static struct iommu_domain * +intel_iommu_domain_alloc_user(struct device *dev, u32 flags) +{ + struct iommu_domain *domain; + struct intel_iommu *iommu; + + if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT)) + return ERR_PTR(-EOPNOTSUPP); + + iommu = device_to_iommu(dev, NULL, NULL); + if (!iommu) + return ERR_PTR(-ENODEV); + + if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ecap_nest(iommu->ecap)) + return ERR_PTR(-EOPNOTSUPP); + + /* + * domain_alloc_user op needs to fully initialize a domain + * before return, so uses iommu_domain_alloc() here for + * simple. + */ + domain = iommu_domain_alloc(dev->bus); + if (!domain) + domain = ERR_PTR(-ENOMEM); + return domain; +} + static void intel_iommu_domain_free(struct iommu_domain *domain) { if (domain != &si_domain->domain && domain != &blocking_domain) @@ -4807,6 +4834,7 @@ const struct iommu_ops intel_iommu_ops = { .capable = intel_iommu_capable, .hw_info = intel_iommu_hw_info, .domain_alloc = intel_iommu_domain_alloc, + .domain_alloc_user = intel_iommu_domain_alloc_user, .probe_device = intel_iommu_probe_device, .probe_finalize = intel_iommu_probe_finalize, .release_device = intel_iommu_release_device, -- cgit v1.2.3