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Subject[PATCH 31/34] x86/amd-iommu: Introduce iommu_flush_device() function
Date
This patch adds a function to flush a DTE entry for a given
struct device and replaces iommu_queue_inv_dev_entry calls
with this function where appropriate.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 19 +++++++++++++++----
1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index e3363fd..41c4ebe 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -494,6 +494,17 @@ static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid)
return ret;
}

+static int iommu_flush_device(struct device *dev)
+{
+ struct amd_iommu *iommu;
+ u16 devid;
+
+ devid = get_device_id(dev);
+ iommu = amd_iommu_rlookup_table[devid];
+
+ return iommu_queue_inv_dev_entry(iommu, devid);
+}
+
static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
u16 domid, int pde, int s)
{
@@ -1382,7 +1393,7 @@ static void do_attach(struct device *dev, struct protection_domain *domain)
domain->dev_cnt += 1;

/* Flush the DTE entry */
- iommu_queue_inv_dev_entry(iommu, devid);
+ iommu_flush_device(dev);
}

static void do_detach(struct device *dev)
@@ -1405,7 +1416,7 @@ static void do_detach(struct device *dev)
clear_dte_entry(devid);

/* Flush the DTE entry */
- iommu_queue_inv_dev_entry(iommu, devid);
+ iommu_flush_device(dev);
}

/*
@@ -1610,7 +1621,7 @@ static int device_change_notifier(struct notifier_block *nb,
goto out;
}

- iommu_queue_inv_dev_entry(iommu, devid);
+ iommu_flush_device(dev);
iommu_completion_wait(iommu);

out:
@@ -2393,7 +2404,7 @@ static void amd_iommu_detach_device(struct iommu_domain *dom,
if (!iommu)
return;

- iommu_queue_inv_dev_entry(iommu, devid);
+ iommu_flush_device(dev);
iommu_completion_wait(iommu);
}

--
1.6.5.3



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