From 4c232a708be1047fe26b7c75ceaa5d73deb6a798 Mon Sep 17 00:00:00 2001 From: Baoquan He Date: Wed, 9 Aug 2017 16:33:33 +0800 Subject: [PATCH] iommu/amd: Detect pre enabled translation Add functions to check whether translation is already enabled in IOMMU. Signed-off-by: Baoquan He Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu_init.c | 24 ++++++++++++++++++++++++ drivers/iommu/amd_iommu_proto.h | 1 + drivers/iommu/amd_iommu_types.h | 3 +++ 3 files changed, 28 insertions(+) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 372303700566..3f72f44fa2df 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -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<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; diff --git a/drivers/iommu/amd_iommu_proto.h b/drivers/iommu/amd_iommu_proto.h index 466260f8a1df..a9666d2005bb 100644 --- a/drivers/iommu/amd_iommu_proto.h +++ b/drivers/iommu/amd_iommu_proto.h @@ -87,4 +87,5 @@ static inline bool iommu_feature(struct amd_iommu *iommu, u64 f) return !!(iommu->features & f); } +extern bool translation_pre_enabled(struct amd_iommu *iommu); #endif /* _ASM_X86_AMD_IOMMU_PROTO_H */ diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h index 294a409e283b..0c98b2cf04cc 100644 --- a/drivers/iommu/amd_iommu_types.h +++ b/drivers/iommu/amd_iommu_types.h @@ -435,6 +435,8 @@ struct iommu_domain; struct irq_domain; struct amd_irte_ops; +#define AMD_IOMMU_FLAG_TRANS_PRE_ENABLED (1 << 0) + /* * This structure contains generic data for IOMMU protection domains * independent of their use. @@ -569,6 +571,7 @@ struct amd_iommu { struct amd_irte_ops *irte_ops; #endif + u32 flags; volatile u64 __aligned(8) cmd_sem; }; -- 2.20.1