| commit | 10b35b2b7485c342334a48cf199063eed8b8748e | |
| author | Alexey Kardashevskiy <aik@ozlabs.ru> | |
| Fri, 5 Jun 2015 06:35:05 +0000 (5 16:35 +1000) | ||
| committer | Michael Ellerman <mpe@ellerman.id.au> | |
| Thu, 11 Jun 2015 05:14:56 +0000 (11 15:14 +1000) | ||
| tree | c609824799ab76a33d1dad1c6a9a254cb8baad99 | treesnapshot (tar.gz zip) |
| parent | 22af48596e9c92313d475306b684f844301ea4cd | commitdiff |
powerpc/powernv: Do not set "read" flag if direction==DMA_NONE
Normally a bitmap from the iommu_table is used to track what TCE entry
is in use. Since we are going to use iommu_table without its locks and
do xchg() instead, it becomes essential not to put bits which are not
implied in the direction flag as the old TCE value (more precisely -
the permission bits) will be used to decide whether to put the page or not.
This adds iommu_direction_to_tce_perm() (its counterpart is there already)
and uses it for powernv's pnv_tce_build().
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Normally a bitmap from the iommu_table is used to track what TCE entry
is in use. Since we are going to use iommu_table without its locks and
do xchg() instead, it becomes essential not to put bits which are not
implied in the direction flag as the old TCE value (more precisely -
the permission bits) will be used to decide whether to put the page or not.
This adds iommu_direction_to_tce_perm() (its counterpart is there already)
and uses it for powernv's pnv_tce_build().
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| arch/powerpc/include/asm/iommu.h | diffblobblamehistory | |
| arch/powerpc/kernel/iommu.c | diffblobblamehistory | |
| arch/powerpc/platforms/powernv/pci.c | diffblobblamehistory |