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iommu/amd: Detect pre enabled translation

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Add functions to check whether translation is already enabled in IOMMU.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Baoquan He
2017-08-09 16:33:33 +08:00
committed by Joerg Roedel
parent ef954844c7
commit 4c232a708b
3 changed files with 28 additions and 0 deletions
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24
drivers/iommu/amd_iommu_init.c
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@@ -258,6 +258,25 @@ static int amd_iommu_enable_interrupts(void);
static int __init iommu_go_to_state(enum iommu_init_state state);
static void init_device_table_dma(void);
bool translation_pre_enabled(struct amd_iommu *iommu)
{
return (iommu->flags & AMD_IOMMU_FLAG_TRANS_PRE_ENABLED);
}
static void clear_translation_pre_enabled(struct amd_iommu *iommu)
{
iommu->flags &= ~AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
}
static void init_translation_status(struct amd_iommu *iommu)
{
u32 ctrl;
ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
if (ctrl & (1<<CONTROL_IOMMU_EN))
iommu->flags |= AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
}
static inline void update_last_devid(u16 devid)
{
if (devid > amd_iommu_last_bdf)
@@ -1399,6 +1418,11 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
iommu->int_enabled = false;
init_translation_status(iommu);
if (translation_pre_enabled(iommu))
pr_warn("Translation is already enabled - trying to copy translation structures\n");
ret = init_iommu_from_acpi(iommu, h);
if (ret)
return ret;