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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>
This commit is contained in:
Joerg Roedel 2015-06-12 10:14:02 +02:00
parent 5f0a7f7614
commit 4158c2eca3
2 changed files with 23 additions and 0 deletions
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19
drivers/iommu/intel-iommu.c
View File

@ -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

4
include/linux/intel-iommu.h
View File

@ -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(