lkml.org 
[lkml]   [2020]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH rdma-rc 3/3] IB/core: Fix ODP with IB_ACCESS_HUGETLB handling
 	Hi Leon,

On Thu, 19 Dec 2019, Leon Romanovsky wrote:
> From: Yishai Hadas <yishaih@mellanox.com>
>
> As VMAs for a given range might not be available as part of the
> registration phase in ODP, IB_ACCESS_HUGETLB/page_shift must be checked
> as part of the page fault flow.
>
> If the application didn't mmap the backed memory with huge pages or
> released part of that hugepage area, an error will be set as part of the
> page fault flow once be detected.
>
> Fixes: 0008b84ea9af ("IB/umem: Add support to huge ODP")
> Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
> Reviewed-by: Artemy Kovalyov <artemyko@mellanox.com>
> Reviewed-by: Aviad Yehezkel <aviadye@mellanox.com>
> Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

Thanks for your patch!

> --- 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(struct ib_udata *udata, unsigned long addr,
> 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);

noreply@ellerman.id.au reports for linux-next/m68k-allmodconfig/m68k:

drivers/infiniband/core/umem_odp.c:245:26: error: 'HPAGE_SHIFT' undeclared (first use in this function); did you mean 'PAGE_SHIFT'?

Should this depend on some HUGETLBFS option?

Gr{oetje,eeting}s,

Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds

\
 
 \ /
  Last update: 2020-01-08 13:57    [W:0.039 / U:4.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site