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| author | Joerg Roedel <jroedel@suse.de> | 2015-06-12 11:14:02 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2015-06-16 11:59:34 +0300 |
| commit | 4158c2eca3c77ed3cccdcaeab153aad4e433369c (patch) | |
| tree | 9a4b82ece9257f547d8958d1925c128e2d0f266b | |
| parent | 5f0a7f7614a9d99325ac8d618f1cdf7a3014287c (diff) | |
| download | linux-4158c2eca3c77ed3cccdcaeab153aad4e433369c.tar.xz | |
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>
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 19 | ||||
| -rw-r--r-- | include/linux/intel-iommu.h | 4 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index bf3e450b5b97..39b90621a1a1 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -443,6 +443,20 @@ static LIST_HEAD(device_domain_list); static const struct iommu_ops intel_iommu_ops; +static bool translation_pre_enabled(struct intel_iommu *iommu) +{ + return (iommu->flags & VTD_FLAG_TRANS_PRE_ENABLED); +} + +static void init_translation_status(struct intel_iommu *iommu) +{ + u32 gsts; + + gsts = readl(iommu->reg + DMAR_GSTS_REG); + if (gsts & DMA_GSTS_TES) + iommu->flags |= VTD_FLAG_TRANS_PRE_ENABLED; +} + /* Convert generic 'struct iommu_domain to private struct dmar_domain */ static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom) { @@ -2809,6 +2823,11 @@ static int __init init_dmars(void) if (ret) goto free_iommu; + init_translation_status(iommu); + + if (translation_pre_enabled(iommu)) + pr_info("Translation already enabled - trying to copy translation structures\n"); + /* * TBD: * we could share the same root & context tables diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index a240e61a7700..b85b81ad5eba 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -320,6 +320,9 @@ enum { MAX_SR_DMAR_REGS }; +#define VTD_FLAG_TRANS_PRE_ENABLED (1 << 0) +#define VTD_FLAG_IRQ_REMAP_PRE_ENABLED (1 << 1) + struct intel_iommu { void __iomem *reg; /* Pointer to hardware regs, virtual addr */ u64 reg_phys; /* physical address of hw register set */ @@ -351,6 +354,7 @@ struct intel_iommu { #endif struct device *iommu_dev; /* IOMMU-sysfs device */ int node; + u32 flags; /* Software defined flags */ }; static inline void __iommu_flush_cache( |