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authorJoerg Roedel <joerg.roedel@amd.com>2008-12-08 12:02:41 +0100
committerJoerg Roedel <joerg.roedel@amd.com>2009-01-03 14:11:55 +0100
commit355bf553edb7fe21ada51f62c849180bec6da877 (patch)
tree64c0c55bd838aa70b5395ea566b23e6b744d9780 /arch
parentf1179dc005ee2b0e55c3f74f3552c3e9ef852265 (diff)
AMD IOMMU: add device detach helper functions
Impact: add helper functions to detach a device from a domain Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/amd_iommu.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 12e8b67e588..15456a3a18c 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -844,6 +844,45 @@ static void attach_device(struct amd_iommu *iommu,
iommu_queue_inv_dev_entry(iommu, devid);
}
+#ifdef CONFIG_IOMMU_API
+/*
+ * Removes a device from a protection domain (unlocked)
+ */
+static void __detach_device(struct protection_domain *domain, u16 devid)
+{
+
+ /* lock domain */
+ spin_lock(&domain->lock);
+
+ /* remove domain from the lookup table */
+ amd_iommu_pd_table[devid] = NULL;
+
+ /* remove entry from the device table seen by the hardware */
+ amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
+ amd_iommu_dev_table[devid].data[1] = 0;
+ amd_iommu_dev_table[devid].data[2] = 0;
+
+ /* decrease reference counter */
+ domain->dev_cnt -= 1;
+
+ /* ready */
+ spin_unlock(&domain->lock);
+}
+
+/*
+ * Removes a device from a protection domain (with devtable_lock held)
+ */
+static void detach_device(struct protection_domain *domain, u16 devid)
+{
+ unsigned long flags;
+
+ /* lock device table */
+ write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ __detach_device(domain, devid);
+ write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+}
+#endif
+
/*****************************************************************************
*
* The next functions belong to the dma_ops mapping/unmapping code.