From 28ccce0d954a1cf3baba335bf12581357112fb35 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Tue, 21 Jul 2015 14:45:31 +0200 Subject: [PATCH] iommu/vt-d: Calculate translation in domain_context_mapping_one There is no reason to pass the translation type through multiple layers. It can also be determined in the domain_context_mapping_one function directly. Signed-off-by: Joerg Roedel --- drivers/iommu/intel-iommu.c | 49 +++++++++++++++++-------------------- 1 file changed, 23 insertions(+), 26 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 0a07b44fbc82..ca6ca3ddf349 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -364,7 +364,8 @@ static inline int first_pte_in_page(struct dma_pte *pte) static struct dmar_domain *si_domain; static int hw_pass_through = 1; -/* domain represents a virtual machine, more than one devices +/* + * Domain represents a virtual machine, more than one devices * across iommus may be owned in one domain, e.g. kvm guest. */ #define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 0) @@ -640,6 +641,11 @@ static inline int domain_type_is_vm(struct dmar_domain *domain) return domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE; } +static inline int domain_type_is_si(struct dmar_domain *domain) +{ + return domain->flags & DOMAIN_FLAG_STATIC_IDENTITY; +} + static inline int domain_type_is_vm_or_si(struct dmar_domain *domain) { return domain->flags & (DOMAIN_FLAG_VIRTUAL_MACHINE | @@ -1907,21 +1913,23 @@ static void domain_exit(struct dmar_domain *domain) static int domain_context_mapping_one(struct dmar_domain *domain, struct intel_iommu *iommu, - u8 bus, u8 devfn, int translation) + u8 bus, u8 devfn) { + int translation = CONTEXT_TT_MULTI_LEVEL; + struct device_domain_info *info = NULL; struct context_entry *context; unsigned long flags; struct dma_pte *pgd; int id; int agaw; - struct device_domain_info *info = NULL; + + if (hw_pass_through && domain_type_is_si(domain)) + translation = CONTEXT_TT_PASS_THROUGH; pr_debug("Set context mapping for %02x:%02x.%d\n", bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); BUG_ON(!domain->pgd); - BUG_ON(translation != CONTEXT_TT_PASS_THROUGH && - translation != CONTEXT_TT_MULTI_LEVEL); spin_lock_irqsave(&iommu->lock, flags); context = iommu_context_addr(iommu, bus, devfn, 1); @@ -2013,7 +2021,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain, struct domain_context_mapping_data { struct dmar_domain *domain; struct intel_iommu *iommu; - int translation; }; static int domain_context_mapping_cb(struct pci_dev *pdev, @@ -2022,13 +2029,11 @@ static int domain_context_mapping_cb(struct pci_dev *pdev, struct domain_context_mapping_data *data = opaque; return domain_context_mapping_one(data->domain, data->iommu, - PCI_BUS_NUM(alias), alias & 0xff, - data->translation); + PCI_BUS_NUM(alias), alias & 0xff); } static int -domain_context_mapping(struct dmar_domain *domain, struct device *dev, - int translation) +domain_context_mapping(struct dmar_domain *domain, struct device *dev) { struct intel_iommu *iommu; u8 bus, devfn; @@ -2039,12 +2044,10 @@ domain_context_mapping(struct dmar_domain *domain, struct device *dev, return -ENODEV; if (!dev_is_pci(dev)) - return domain_context_mapping_one(domain, iommu, bus, devfn, - translation); + return domain_context_mapping_one(domain, iommu, bus, devfn); data.domain = domain; data.iommu = iommu; - data.translation = translation; return pci_for_each_dma_alias(to_pci_dev(dev), &domain_context_mapping_cb, &data); @@ -2511,7 +2514,7 @@ static int iommu_prepare_identity_map(struct device *dev, goto error; /* context entry init */ - ret = domain_context_mapping(domain, dev, CONTEXT_TT_MULTI_LEVEL); + ret = domain_context_mapping(domain, dev); if (ret) goto error; @@ -2624,8 +2627,7 @@ static int identity_mapping(struct device *dev) return 0; } -static int domain_add_dev_info(struct dmar_domain *domain, - struct device *dev, int translation) +static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev) { struct dmar_domain *ndomain; struct intel_iommu *iommu; @@ -2640,7 +2642,7 @@ static int domain_add_dev_info(struct dmar_domain *domain, if (ndomain != domain) return -EBUSY; - ret = domain_context_mapping(domain, dev, translation); + ret = domain_context_mapping(domain, dev); if (ret) { domain_remove_one_dev_info(domain, dev); return ret; @@ -2785,9 +2787,7 @@ static int __init dev_prepare_static_identity_mapping(struct device *dev, int hw if (!iommu_should_identity_map(dev, 1)) return 0; - ret = domain_add_dev_info(si_domain, dev, - hw ? CONTEXT_TT_PASS_THROUGH : - CONTEXT_TT_MULTI_LEVEL); + ret = domain_add_dev_info(si_domain, dev); if (!ret) pr_info("%s identity mapping for device %s\n", hw ? "Hardware" : "Software", dev_name(dev)); @@ -3314,7 +3314,7 @@ static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev) /* make sure context mapping is ok */ if (unlikely(!domain_context_mapped(dev))) { - ret = domain_context_mapping(domain, dev, CONTEXT_TT_MULTI_LEVEL); + ret = domain_context_mapping(domain, dev); if (ret) { pr_err("Domain context map for %s failed\n", dev_name(dev)); @@ -3369,10 +3369,7 @@ static int iommu_no_mapping(struct device *dev) */ if (iommu_should_identity_map(dev, 0)) { int ret; - ret = domain_add_dev_info(si_domain, dev, - hw_pass_through ? - CONTEXT_TT_PASS_THROUGH : - CONTEXT_TT_MULTI_LEVEL); + ret = domain_add_dev_info(si_domain, dev); if (!ret) { pr_info("64bit %s uses identity mapping\n", dev_name(dev)); @@ -4810,7 +4807,7 @@ static int intel_iommu_attach_device(struct iommu_domain *domain, dmar_domain->agaw--; } - return domain_add_dev_info(dmar_domain, dev, CONTEXT_TT_MULTI_LEVEL); + return domain_add_dev_info(dmar_domain, dev); } static void intel_iommu_detach_device(struct iommu_domain *domain, -- 2.39.5