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SubjectRe: [RFC PATCH rdma-next 01/10] RDMA: mr: Introduce is_pmem
On Tue, Dec 28, 2021 at 04:07:08PM +0800, Li Zhijian wrote:
> We can use it to indicate whether the registering mr is associated with
> a pmem/nvdimm or not.
>
> Currently, we only assign it in rxe driver, for other device/drivers,
> they should implement it if needed.
>
> RDMA FLUSH will support the persistence feature for a pmem/nvdimm.
>
> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
> drivers/infiniband/sw/rxe/rxe_mr.c | 47 ++++++++++++++++++++++++++++++
> include/rdma/ib_verbs.h | 1 +
> 2 files changed, 48 insertions(+)
>
> diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
> index 7c4cd19a9db2..bcd5e7afa475 100644
> +++ b/drivers/infiniband/sw/rxe/rxe_mr.c
> @@ -162,6 +162,50 @@ void rxe_mr_init_dma(struct rxe_pd *pd, int access, struct rxe_mr *mr)
> mr->type = IB_MR_TYPE_DMA;
> }
>
> +// XXX: the logic is similar with mm/memory-failure.c
> +static bool page_in_dev_pagemap(struct page *page)
> +{
> + unsigned long pfn;
> + struct page *p;
> + struct dev_pagemap *pgmap = NULL;
> +
> + pfn = page_to_pfn(page);
> + if (!pfn) {
> + pr_err("no such pfn for page %p\n", page);
> + return false;
> + }
> +
> + p = pfn_to_online_page(pfn);
> + if (!p) {
> + if (pfn_valid(pfn)) {
> + pgmap = get_dev_pagemap(pfn, NULL);
> + if (pgmap)
> + put_dev_pagemap(pgmap);
> + }
> + }
> +
> + return !!pgmap;

You need to get Dan to check this out, but I'm pretty sure this should
be more like this:

if (is_zone_device_page(page) && page->pgmap->type == MEMORY_DEVICE_FS_DAX)


> +static bool iova_in_pmem(struct rxe_mr *mr, u64 iova, int length)
> +{
> + struct page *page = NULL;
> + char *vaddr = iova_to_vaddr(mr, iova, length);
> +
> + if (!vaddr) {
> + pr_err("not a valid iova %llu\n", iova);
> + return false;
> + }
> +
> + page = virt_to_page(vaddr);

And obviously this isn't uniform for the entire umem, so I don't even
know what this is supposed to mean.

> diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
> index 6e9ad656ecb7..822ebb3425dc 100644
> +++ b/include/rdma/ib_verbs.h
> @@ -1807,6 +1807,7 @@ struct ib_mr {
> unsigned int page_size;
> enum ib_mr_type type;
> bool need_inval;
> + bool is_pmem;

Or why it is being stored in the global struct?

Jason

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