summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorBaoquan He <bhe@redhat.com>2017-08-09 11:33:33 +0300
committerJoerg Roedel <jroedel@suse.de>2017-08-15 19:14:38 +0300
commit4c232a708be1047fe26b7c75ceaa5d73deb6a798 (patch)
tree9f17a1d07337472b4113f4e050d1e2bd79c85950 /drivers
parentef954844c7ace62f773f4f23e28d2d915adc419f (diff)
downloadlinux-4c232a708be1047fe26b7c75ceaa5d73deb6a798.tar.xz
iommu/amd: Detect pre enabled translation
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/iommu/amd_iommu_init.c24
-rw-r--r--drivers/iommu/amd_iommu_proto.h1
-rw-r--r--drivers/iommu/amd_iommu_types.h3
3 files changed, 28 insertions, 0 deletions
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<<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;
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;
};