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Message-Id: <1431337974-545-4-git-send-email-zhen-hual@hp.com>
Date: Mon, 11 May 2015 17:52:47 +0800
From: "Li, Zhen-Hua" <zhen-hual@...com>
To: <dwmw2@...radead.org>, <indou.takao@...fujitsu.com>,
<bhe@...hat.com>, <joro@...tes.org>, <vgoyal@...hat.com>,
<dyoung@...hat.com>
Cc: <iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
<linux-pci@...r.kernel.org>, <kexec@...ts.infradead.org>,
<alex.williamson@...hat.com>, <ddutile@...hat.com>,
<ishii.hironobu@...fujitsu.com>, <bhelgaas@...gle.com>,
<doug.hatch@...com>, <jerry.hoemann@...com>, <tom.vaden@...com>,
<li.zhang6@...com>, <lisa.mitchell@...com>,
<billsumnerlinux@...il.com>, <zhen-hual@...com>, <rwright@...com>
Subject: [PATCH v11 03/10] iommu/vt-d: Function to get existing context entry
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@...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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