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Subject[PATCH v11 03/10] iommu/vt-d: Function to get existing context entry
Date
Interface for when a new domain in the old kernel needs some
values from the panicked kernel's context entries.

Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
---
drivers/iommu/intel-iommu.c | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 1e7ceb5..07e6118 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -367,6 +367,10 @@ static inline int first_pte_in_page(struct dma_pte *pte)
* do the same thing as crashdump kernel.
*/

+static struct context_entry *device_to_existing_context_entry(
+ struct intel_iommu *iommu,
+ u8 bus, u8 devfn);
+

/*
* This domain is a statically identity mapping domain.
@@ -4810,3 +4814,22 @@ static void __init check_tylersburg_isoch(void)
printk(KERN_WARNING "DMAR: Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n",
vtisochctrl);
}
+
+static struct context_entry *device_to_existing_context_entry(
+ struct intel_iommu *iommu,
+ u8 bus, u8 devfn)
+{
+ struct root_entry *root;
+ struct context_entry *context;
+ struct context_entry *ret = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&iommu->lock, flags);
+ root = &iommu->root_entry[bus];
+ context = get_context_addr_from_root(root);
+ if (context && context_present(context+devfn))
+ ret = &context[devfn];
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ return ret;
+}
+
--
2.0.0-rc0


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