forge/linux-pinenote
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

iommu/vt-d: Introduce intel_iommu=pasid28, and pasid_enabled() macro

Browse source 
As long as we use an identity mapping to work around the worst of the
hardware bugs which caused us to defeature it and change the definition
of the capability bit, we *can* use PASID support on the devices which
advertised it in bit 28 of the Extended Capability Register.

Allow people to do so with 'intel_iommu=pasid28' on the command line.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2015-09-09 11:58:59 +01:00
parent d14053b3c7
commit ae853ddb9a
2 changed files with 15 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

2
include/linux/intel-iommu.h
View file

@ -121,7 +121,7 @@ static inline void dmar_writeq(void __iomem *addr, u64 val)
#define ecap_srs(e) ((e >> 31) & 0x1)
#define ecap_ers(e) ((e >> 30) & 0x1)
#define ecap_prs(e) ((e >> 29) & 0x1)
/* PASID support used to be on bit 28 */
#define ecap_broken_pasid(e) ((e >> 28) & 0x1)
#define ecap_dis(e) ((e >> 27) & 0x1)
#define ecap_nest(e) ((e >> 26) & 0x1)
#define ecap_mts(e) ((e >> 25) & 0x1)