Commit 4158c2ec authored by Joerg Roedel's avatar Joerg Roedel

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: default avatarZhenHua Li <zhen-hual@hp.com>
Tested-by: default avatarBaoquan He <bhe@redhat.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 5f0a7f76
...@@ -443,6 +443,20 @@ static LIST_HEAD(device_domain_list); ...@@ -443,6 +443,20 @@ static LIST_HEAD(device_domain_list);
static const struct iommu_ops intel_iommu_ops; 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 */ /* Convert generic 'struct iommu_domain to private struct dmar_domain */
static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom) static struct dmar_domain *to_dmar_domain(struct iommu_domain *dom)
{ {
...@@ -2809,6 +2823,11 @@ static int __init init_dmars(void) ...@@ -2809,6 +2823,11 @@ static int __init init_dmars(void)
if (ret) if (ret)
goto free_iommu; goto free_iommu;
init_translation_status(iommu);
if (translation_pre_enabled(iommu))
pr_info("Translation already enabled - trying to copy translation structures\n");
/* /*
* TBD: * TBD:
* we could share the same root & context tables * we could share the same root & context tables
......
...@@ -320,6 +320,9 @@ enum { ...@@ -320,6 +320,9 @@ enum {
MAX_SR_DMAR_REGS MAX_SR_DMAR_REGS
}; };
#define VTD_FLAG_TRANS_PRE_ENABLED (1 << 0)
#define VTD_FLAG_IRQ_REMAP_PRE_ENABLED (1 << 1)
struct intel_iommu { struct intel_iommu {
void __iomem *reg; /* Pointer to hardware regs, virtual addr */ void __iomem *reg; /* Pointer to hardware regs, virtual addr */
u64 reg_phys; /* physical address of hw register set */ u64 reg_phys; /* physical address of hw register set */
...@@ -351,6 +354,7 @@ struct intel_iommu { ...@@ -351,6 +354,7 @@ struct intel_iommu {
#endif #endif
struct device *iommu_dev; /* IOMMU-sysfs device */ struct device *iommu_dev; /* IOMMU-sysfs device */
int node; int node;
u32 flags; /* Software defined flags */
}; };
static inline void __iommu_flush_cache( static inline void __iommu_flush_cache(
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment