xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/mm/hugetlb: add support for 1G huge pages

Browse Source 
POWER9 supports hugepages of size 2M and 1G in radix MMU mode.  This
patch enables the usage of 1G page size for hugetlbfs.  This also update
the helper such we can do 1G page allocation at runtime.

We still don't enable 1G page size on DD1 version.  This is to avoid
doing workaround mentioned in commit 6d3a0379eb ("powerpc/mm: Add
radix__tlb_flush_pte_p9_dd1()").

Link: http://lkml.kernel.org/r/1494995292-4443-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V
2017-07-06 15:39:20 -07:00
committed by Linus Torvalds
parent e1073d1e79
commit 40692eb5ee
3 changed files with 16 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/powerpc/mm/hugetlbpage.c
View File

@@ -742,8 +742,11 @@ static int __init add_huge_page_size(unsigned long long size)
* Hash: 16M and 16G
*/
if (radix_enabled()) {
if (mmu_psize != MMU_PAGE_2M)
return -EINVAL;
if (mmu_psize != MMU_PAGE_2M) {
if (cpu_has_feature(CPU_FTR_POWER9_DD1) ||
(mmu_psize != MMU_PAGE_1G))
return -EINVAL;
}
} else {
if (mmu_psize != MMU_PAGE_16M && mmu_psize != MMU_PAGE_16G)
return -EINVAL;