diff options
| author |   Halil Pasic <pasic@linux.ibm.com> | 2019-04-02 18:47:29 +0200 |
|---|---|---|
| committer |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2019-06-15 12:24:56 +0200 |
| commit | bb99332a2b558e1f28b4c5011f9ea3b46f1c8806 (patch) | |
| tree | f6412179ed9826c356de539543164a32206cb76a /arch/s390/Kconfig | |
| parent | s390/mm: force swiotlb for protected virtualization (diff) | |
| download | linux-dev-bb99332a2b558e1f28b4c5011f9ea3b46f1c8806.tar.xz linux-dev-bb99332a2b558e1f28b4c5011f9ea3b46f1c8806.zip | |
s390/cio: introduce DMA pools to cio
To support protected virtualization cio will need to make sure the
memory used for communication with the hypervisor is DMA memory.
Let us introduce one global pool for cio.
Our DMA pools are implemented as a gen_pool backed with DMA pages. The
idea is to avoid each allocation effectively wasting a page, as we
typically allocate much less than PAGE_SIZE.
Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Michael Mueller <mimu@linux.ibm.com>
Tested-by: Michael Mueller <mimu@linux.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to '')
| -rw-r--r-- | arch/s390/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 35bb76491600..fdb4246265a5 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -190,6 +190,7 @@ config S390 select ARCH_HAS_SCALED_CPUTIME select HAVE_NMI select SWIOTLB + select GENERIC_ALLOCATOR config SCHED_OMIT_FRAME_POINTER |