linux-kernel - [RFC PATCH v2 1/9] RDMA: mr: Introduce is

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Date:   Tue, 25 Jan 2022 16:50:33 +0800
From:   Li Zhijian <lizhijian@...fujitsu.com>
To:     <linux-rdma@...r.kernel.org>, <zyjzyj2000@...il.com>,
        <jgg@...pe.ca>, <aharonl@...dia.com>, <leon@...nel.org>,
        <tom@...pey.com>, <tomasz.gromadzki@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <mbloch@...dia.com>,
        <liangwenpeng@...wei.com>, <yangx.jy@...itsu.com>,
        <y-goto@...itsu.com>, <rpearsonhpe@...il.com>,
        <dan.j.williams@...el.com>, Li Zhijian <lizhijian@...fujitsu.com>
Subject: [RFC PATCH v2 1/9] RDMA: mr: Introduce is_pmem

We can use it to indicate whether the registering mr is associated with
a pmem/nvdimm or not.

Currently, we only update it in rxe driver, for other device/drivers,
they should implement it if needed.

CC: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Li Zhijian <lizhijian@...fujitsu.com>
---
V2: check 1st byte to avoid crossing page boundary
    new scheme to check is_pmem # Dan
---
 drivers/infiniband/sw/rxe/rxe_mr.c | 25 +++++++++++++++++++++++++
 include/rdma/ib_verbs.h            |  1 +
 2 files changed, 26 insertions(+)

diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
index 453ef3c9d535..0427baea8c06 100644
--- a/drivers/infiniband/sw/rxe/rxe_mr.c
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -161,6 +161,28 @@ void rxe_mr_init_dma(struct rxe_pd *pd, int access, struct rxe_mr *mr)
 	mr->type = IB_MR_TYPE_DMA;
 }
 
+static bool iova_in_pmem(struct rxe_mr *mr, u64 iova, int length)
+{
+	char *vaddr;
+	int is_pmem;
+
+	/* XXX: Shall me allow length == 0 */
+	if (length == 0) {
+		return false;
+	}
+	/* check the 1st byte only to avoid crossing page boundary */
+	vaddr = iova_to_vaddr(mr, iova, 1);
+	if (!vaddr) {
+		pr_warn("not a valid iova 0x%llx\n", iova);
+		return false;
+	}
+
+	is_pmem = region_intersects(virt_to_phys(vaddr), 1, IORESOURCE_MEM,
+				    IORES_DESC_PERSISTENT_MEMORY);
+
+	return is_pmem == REGION_INTERSECTS;
+}
+
 int rxe_mr_init_user(struct rxe_pd *pd, u64 start, u64 length, u64 iova,
 		     int access, struct rxe_mr *mr)
 {
@@ -235,6 +257,9 @@ int rxe_mr_init_user(struct rxe_pd *pd, u64 start, u64 length, u64 iova,
 	set->va = start;
 	set->offset = ib_umem_offset(umem);
 
+	// iova_in_pmem() must be called after set is updated
+	mr->ibmr.is_pmem = iova_in_pmem(mr, iova, length);
+
 	return 0;
 
 err_release_umem:
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 69d883f7fb41..4fa07b123c8d 100644
--- a/include/rdma/ib_verbs.h
+++ 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;
 	union {
 		struct ib_uobject	*uobject;	/* user */
 		struct list_head	qp_entry;	/* FR */
-- 
2.31.1