From: Yishai Hadas yishaih@mellanox.com
commit 9ff1b6466a291a33389c4a9c7f3f9b64d62df40a upstream.
As VMAs for a given range might not be available as part of the registration phase in ODP.
ib_init_umem_odp() considered the expected page shift value that was previously set and initializes its internals accordingly.
If memory isn't backed by physical contiguous pages aligned to a hugepage boundary an error will be set as part of the page fault flow and come back to the user as some failed RDMA operation.
Fixes: 0008b84ea9af ("IB/umem: Add support to huge ODP") Link: https://lore.kernel.org/r/20191222124649.52300-4-leon@kernel.org Signed-off-by: Yishai Hadas yishaih@mellanox.com Reviewed-by: Artemy Kovalyov artemyko@mellanox.com Signed-off-by: Leon Romanovsky leonro@mellanox.com Reviewed-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/infiniband/core/umem_odp.c | 21 ++++----------------- 1 file changed, 4 insertions(+), 17 deletions(-)
--- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -241,22 +241,10 @@ struct ib_umem_odp *ib_umem_odp_get(stru umem_odp->umem.owning_mm = mm = current->mm; umem_odp->notifier.ops = ops;
- umem_odp->page_shift = PAGE_SHIFT; - if (access & IB_ACCESS_HUGETLB) { - struct vm_area_struct *vma; - struct hstate *h; - - down_read(&mm->mmap_sem); - vma = find_vma(mm, ib_umem_start(umem_odp)); - if (!vma || !is_vm_hugetlb_page(vma)) { - up_read(&mm->mmap_sem); - ret = -EINVAL; - goto err_free; - } - h = hstate_vma(vma); - umem_odp->page_shift = huge_page_shift(h); - up_read(&mm->mmap_sem); - } + if (access & IB_ACCESS_HUGETLB) + umem_odp->page_shift = HPAGE_SHIFT; + else + umem_odp->page_shift = PAGE_SHIFT;
umem_odp->tgid = get_task_pid(current->group_leader, PIDTYPE_PID); ret = ib_init_umem_odp(umem_odp, ops); @@ -266,7 +254,6 @@ struct ib_umem_odp *ib_umem_odp_get(stru
err_put_pid: put_pid(umem_odp->tgid); -err_free: kfree(umem_odp); return ERR_PTR(ret); }