Messages in this thread Patch in this message | | | From | Baoquan He <> | Subject | [Patch v4 3/9] iommu/amd: Detect pre enabled translation | Date | Wed, 25 May 2016 14:28:49 +0800 |
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Add functions to check whether translation is already enabled in IOMMU.
Signed-off-by: Baoquan He <bhe@redhat.com> --- drivers/iommu/amd_iommu_init.c | 25 +++++++++++++++++++++++++ drivers/iommu/amd_iommu_types.h | 4 ++++ 2 files changed, 29 insertions(+)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 8361367d..9e1dfcb 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -229,6 +229,26 @@ 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); + +static 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 int iommu_pc_get_set_reg_val(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value, bool is_write); @@ -1101,6 +1121,11 @@ 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()) + pr_warn("Translation is already enabled - trying to copy translation structures\n"); + ret = init_iommu_from_acpi(iommu, h); if (ret) return ret; diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index 9d32b20..01783cc 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -384,6 +384,7 @@ extern struct kmem_cache *amd_iommu_irq_cache; #define APERTURE_PAGE_INDEX(a) (((a) >> 21) & 0x3fULL) + /* * This struct is used to pass information about * incoming PPR faults around. @@ -401,6 +402,8 @@ struct amd_iommu_fault { struct iommu_domain; struct irq_domain; +#define AMD_IOMMU_FLAG_TRANS_PRE_ENABLED (1 << 0) + /* * This structure contains generic data for IOMMU protection domains * independent of their use. @@ -525,6 +528,7 @@ struct amd_iommu { struct irq_domain *ir_domain; struct irq_domain *msi_domain; #endif + u32 flags; }; struct devid_map { -- 2.5.5
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