iommu/vt-d: Detect pre enabled translation
Add code to detect whether translation is already enabled in the IOMMU. Save this state in a flags field added to struct intel_iommu. Tested-by: ZhenHua Li <zhen-hual@hp.com> Tested-by: Baoquan He <bhe@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -443,6 +443,20 @@ static LIST_HEAD(device_domain_list);
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static const struct iommu_ops intel_iommu_ops;
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static bool translation_pre_enabled(struct intel_iommu *iommu)
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{
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return (iommu->flags & VTD_FLAG_TRANS_PRE_ENABLED);
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}
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static void init_translation_status(struct intel_iommu *iommu)
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{
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u32 gsts;
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gsts = readl(iommu->reg + DMAR_GSTS_REG);
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if (gsts & DMA_GSTS_TES)
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iommu->flags |= VTD_FLAG_TRANS_PRE_ENABLED;
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}
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/* Convert generic 'struct iommu_domain to private struct dmar_domain */
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static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom)
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{
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@ -2809,6 +2823,11 @@ static int __init init_dmars(void)
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if (ret)
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goto free_iommu;
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init_translation_status(iommu);
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if (translation_pre_enabled(iommu))
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pr_info("Translation already enabled - trying to copy translation structures\n");
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/*
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* TBD:
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* we could share the same root & context tables
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@ -320,6 +320,9 @@ enum {
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MAX_SR_DMAR_REGS
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};
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#define VTD_FLAG_TRANS_PRE_ENABLED (1 << 0)
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#define VTD_FLAG_IRQ_REMAP_PRE_ENABLED (1 << 1)
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struct intel_iommu {
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void __iomem *reg; /* Pointer to hardware regs, virtual addr */
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u64 reg_phys; /* physical address of hw register set */
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@ -351,6 +354,7 @@ struct intel_iommu {
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#endif
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struct device *iommu_dev; /* IOMMU-sysfs device */
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int node;
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u32 flags; /* Software defined flags */
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};
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static inline void __iommu_flush_cache(
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