From: Baoquan He <bhe@redhat.com>
To: jroedel@suse.de
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
Baoquan He <bhe@redhat.com>
Subject: [PATCH v10 01/12] iommu/amd: Detect pre enabled translation
Date: Wed, 9 Aug 2017 16:33:33 +0800 [thread overview]
Message-ID: <1502267624-7066-2-git-send-email-bhe@redhat.com> (raw)
In-Reply-To: <1502267624-7066-1-git-send-email-bhe@redhat.com>
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 | 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<<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;
};
--
2.5.5
next prev parent reply other threads:[~2017-08-09 8:33 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-09 8:33 [PATCH v10 00/12] Fix the on-flight DMA issue on system with amd iommu Baoquan He
2017-08-09 8:33 ` Baoquan He [this message]
2017-08-09 8:33 ` [PATCH v10 02/12] iommu/amd: add several helper functions Baoquan He
2017-08-09 8:33 ` [PATCH v10 03/12] Revert "iommu/amd: Suppress IO_PAGE_FAULTs in kdump kernel" Baoquan He
2017-08-09 8:33 ` [PATCH v10 04/12] iommu/amd: Define bit fields for DTE particularly Baoquan He
2017-08-09 8:33 ` [PATCH v10 05/12] iommu/amd: Add function copy_dev_tables() Baoquan He
2017-08-09 8:33 ` [PATCH v10 06/12] iommu/amd: copy old trans table from old kernel Baoquan He
2017-08-09 8:33 ` [PATCH v10 07/12] iommu/amd: Do sanity check for address translation and irq remap of old dev table entry Baoquan He
2017-08-09 8:33 ` [PATCH v10 08/12] iommu: Add is_attach_deferred call-back to iommu-ops Baoquan He
2017-08-09 8:33 ` [PATCH v10 09/12] iommu/amd: Use is_attach_deferred call-back Baoquan He
2017-08-09 8:33 ` [PATCH v10 10/12] iommu/amd: Allocate memory below 4G for dev table if translation pre-enabled Baoquan He
2017-08-09 8:33 ` [PATCH v10 11/12] iommu/amd: Don't copy GCR3 table root pointer Baoquan He
2017-08-09 8:33 ` [PATCH v10 12/12] iommu/amd: Disable iommu only if amd_iommu=off is specified Baoquan He
2017-08-15 16:18 ` [PATCH v10 00/12] Fix the on-flight DMA issue on system with amd iommu Joerg Roedel
2017-08-16 1:31 ` Baoquan He
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