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AMD IOMMU: add device detach helper functions

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Impact: add helper functions to detach a device from a domain

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-08 12:02:41 +01:00
parent f1179dc005
commit 355bf553ed
1 changed files with 39 additions and 0 deletions
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39
arch/x86/kernel/amd_iommu.c
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@ -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.