Xen devel - Mar 2009 - [PATCH] vtd: fix Dom0 S3 when VT-d is enabled.

On some platforms that support Queued Invalidation and Interrupt Remapping,
Dom0 S3 doesn''t work. The patch fixes the issue.

1) In device_power_down(), we should invoke iommu_suspend() after
ioapic_suspend(); in device_power_up(), we should invoke iommu_resume()
before ioapic_resume().

2) Add 2 functions: disable_qinval() and disable_intremap(); in
iommu_suspend(), we invoke them and iommu_disable_translation().
   Rename qinval_setup() to enable_qinval() and rename intremap_setup()
to enable_intremap().

3) In iommu_resume(), remove the unnecessary
iommu_flush_{context, iotlb}_global() -- actually we mustn''t do that if
Queued
Invalidatin was enabled before S3 becauese at this point of S3 resume,  Queued
Invalidatin hasn''t been re-enabled.

4) Add a static global array ioapic_pin_to_intremap_index[] to remember what
intremap_index an ioapic pin uses -- during S3 resume, ioapic_resume() 
re-writes all the ioapic RTEs, so we can use the array to re-use the
previously-allocated IRTE;

5) Some cleanups: 
   a) Change some failure handlings in enable_intremap() to panic().
   b) Remove the unnecessary local variable iec_cap in  __iommu_flush_iec().
   c) Add a dmar_writeq(iommu->reg, DMAR_IQT_REG, 0) in enable_qinval().
 
Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>


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