lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

x86, dmar: routines for disabling queued invalidation and intr remapping

Browse Source 
Impact: new interfaces (not yet used)

Routines for disabling queued invalidation and interrupt remapping.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Suresh Siddha
2009-03-16 17:04:56 -07:00
committed by H. Peter Anvin
parent 9d783ba042
commit eba67e5da6
3 changed files with 64 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/pci/dmar.c
View File

@@ -753,6 +753,42 @@ int qi_flush_iotlb(struct intel_iommu *iommu, u16 did, u64 addr,
return qi_submit_sync(&desc, iommu);
}
/*
* Disable Queued Invalidation interface.
*/
void dmar_disable_qi(struct intel_iommu *iommu)
{
unsigned long flags;
u32 sts;
cycles_t start_time = get_cycles();
if (!ecap_qis(iommu->ecap))
return;
spin_lock_irqsave(&iommu->register_lock, flags);
sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
if (!(sts & DMA_GSTS_QIES))
goto end;
/*
* Give a chance to HW to complete the pending invalidation requests.
*/
while ((readl(iommu->reg + DMAR_IQT_REG) !=
readl(iommu->reg + DMAR_IQH_REG)) &&
(DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time)))
cpu_relax();
iommu->gcmd &= ~DMA_GCMD_QIE;
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, readl,
!(sts & DMA_GSTS_QIES), sts);
end:
spin_unlock_irqrestore(&iommu->register_lock, flags);
}
/*
* Enable Queued Invalidation interface. This is a must to support
* interrupt-remapping. Also used by DMA-remapping, which replaces