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Subject[PATCH v10 03/10] iommu/vt-d: Function to get old context entry
Date
Interface for when a new domain in the crashdump 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 | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 735e28f..ff5ac04 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -369,6 +369,10 @@ static inline int first_pte_in_page(struct dma_pte *pte)
*/


+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.
@@ -4793,3 +4797,23 @@ 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;
+ unsigned long flags;
+
+ ret = NULL;
+ 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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