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authorOded Gabbay <oded.gabbay@gmail.com>2019-05-28 23:03:54 +0300
committerOded Gabbay <oded.gabbay@gmail.com>2019-05-28 23:03:54 +0300
commitd724170160f800fa8dfd3c0cdebb8b093570b504 (patch)
tree22a4b6c4e9138187168b23bacaf156b42efa4353 /drivers/misc
parent8aa75b72e3e6f0f566cd963606ec5da11b195c0b (diff)
downloadlinux-d724170160f800fa8dfd3c0cdebb8b093570b504.tar.xz
habanalabs: fix bug in checking huge page optimization
This patch fix a bug in the mmu code that checks whether we can use huge page mappings for host pages. The code is supposed to enable huge page mappings only if ALL DMA addresses are aligned to 2MB AND the number of pages in each DMA chunk is a modulo of the number of pages in 2MB. However, the code ignored the first requirement for the first DMA chunk. This patch fix that issue by making sure the requirement of address alignment is validated against all DMA chunks. Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/habanalabs/memory.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/misc/habanalabs/memory.c b/drivers/misc/habanalabs/memory.c
index d67d24c13efd..693877e37fd8 100644
--- a/drivers/misc/habanalabs/memory.c
+++ b/drivers/misc/habanalabs/memory.c
@@ -675,11 +675,6 @@ static int init_phys_pg_pack_from_userptr(struct hl_ctx *ctx,
total_npages += npages;
- if (first) {
- first = false;
- dma_addr &= PAGE_MASK_2MB;
- }
-
if ((npages % PGS_IN_2MB_PAGE) ||
(dma_addr & (PAGE_SIZE_2MB - 1)))
is_huge_page_opt = false;
@@ -704,7 +699,6 @@ static int init_phys_pg_pack_from_userptr(struct hl_ctx *ctx,
phys_pg_pack->total_size = total_npages * page_size;
j = 0;
- first = true;
for_each_sg(userptr->sgt->sgl, sg, userptr->sgt->nents, i) {
npages = get_sg_info(sg, &dma_addr);