From: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org
Cc: kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: [PATCH v7 01/12] iommu/amd: Detect pre enabled translation
Date: Fri, 25 Nov 2016 13:13:08 +0800 [thread overview]
Message-ID: <1480050799-1237-2-git-send-email-bhe@redhat.com> (raw)
In-Reply-To: <1480050799-1237-1-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Add functions to check whether translation is already enabled in IOMMU.
Signed-off-by: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
drivers/iommu/amd_iommu_init.c | 25 +++++++++++++++++++++++++
drivers/iommu/amd_iommu_proto.h | 1 +
drivers/iommu/amd_iommu_types.h | 4 ++++
3 files changed, 30 insertions(+)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 157e934..5ad1e023 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -251,6 +251,26 @@ 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);
+
+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);
@@ -1389,6 +1409,11 @@ 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 7eb60c1..9560183 100644
--- a/drivers/iommu/amd_iommu_proto.h
+++ b/drivers/iommu/amd_iommu_proto.h
@@ -93,4 +93,5 @@ 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 0d91785..2bbc19d 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -416,6 +416,7 @@ 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.
@@ -434,6 +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.
@@ -566,6 +569,7 @@ 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:[~2016-11-25 5:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-25 5:13 [PATCH v7 00/12] Fix kdump faults on system with amd iommu Baoquan He
[not found] ` <1480050799-1237-1-git-send-email-bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-11-25 5:13 ` Baoquan He [this message]
2016-11-25 5:13 ` [PATCH v7 02/12] iommu/amd: add several helper function Baoquan He
2016-11-25 5:13 ` [PATCH v7 03/12] iommu/amd: Define bit fields for DTE particularly Baoquan He
2016-11-25 5:13 ` [PATCH v7 04/12] iommu/amd: Add function copy_dev_tables Baoquan He
2016-11-25 5:13 ` [PATCH v7 05/12] iommu/amd: copy old trans table from old kernel Baoquan He
2016-11-25 5:13 ` [PATCH v7 06/12] iommu: Add is_attach_deferred call-back to iommu-ops Baoquan He
2016-11-25 5:13 ` [PATCH v7 07/12] iommu/amd: Use is_attach_deferred call-back Baoquan He
2016-11-25 5:13 ` [PATCH v7 08/12] iommu/amd: Add sanity check of irq remap information of old dev table entry Baoquan He
2016-11-25 5:13 ` [PATCH v7 09/12] iommu/amd: Don't copy GCR3 table root pointer Baoquan He
2016-11-25 5:13 ` [PATCH v7 10/12] iommu/amd: Clear out the GV flag when handle deferred domain attach Baoquan He
2016-11-25 5:13 ` [PATCH v7 11/12] iommu: Assign the direct mapped domain to group->domain Baoquan He
2016-11-25 5:13 ` [PATCH v7 12/12] iommu/amd: Allocate memory below 4G for dev table if translation pre-enabled Baoquan He
2016-12-24 3:47 ` [PATCH v7 00/12] Fix kdump faults on system with amd iommu Baoquan He
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