linux-kernel - [for-next PATCH v6 04/10] RDMA/rxe: Allow registering persistent flag for pmem MR only

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Date:   Wed, 16 Nov 2022 16:19:45 +0800
From:   Li Zhijian <lizhijian@...itsu.com>
To:     zyjzyj2000@...il.com, jgg@...pe.ca, leon@...nel.org,
        Bob Pearson <rpearsonhpe@...il.com>, linux-rdma@...r.kernel.org
Cc:     Mark Bloch <mbloch@...dia.com>, Tom Talpey <tom@...pey.com>,
        tomasz.gromadzki@...el.com,
        Dan Williams <dan.j.williams@...el.com>,
        Xiao Yang <yangx.jy@...itsu.com>, y-goto@...itsu.com,
        linux-kernel@...r.kernel.org, Li Zhijian <lizhijian@...itsu.com>
Subject: [for-next PATCH v6 04/10] RDMA/rxe: Allow registering persistent flag for pmem MR only

Memory region could  support at most 2 flush access flags:
IB_ACCESS_FLUSH_PERSISTENT and IB_ACCESS_FLUSH_GLOBAL

But we only allow user to register persistent flush flags to the pmem MR
where it has the ability of persisting data across power cycles.

So register a persistent access flag to a non-pmem MR will be rejected.

CC: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Li Zhijian <lizhijian@...itsu.com>
---
V6: Minimize pmem checking side effect # Jason
V5: make sure the whole MR is pmem # Bob
V4: set is_pmem more simple
V2: new scheme check is_pmem # Dan
    update commit message, get rid of confusing ib_check_flush_access_flags() # Tom
---
 drivers/infiniband/sw/rxe/rxe_mr.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_mr.c b/drivers/infiniband/sw/rxe/rxe_mr.c
index bc081002bddc..fd423c015be0 100644
--- a/drivers/infiniband/sw/rxe/rxe_mr.c
+++ b/drivers/infiniband/sw/rxe/rxe_mr.c
@@ -111,6 +111,15 @@ void rxe_mr_init_dma(int access, struct rxe_mr *mr)
 	mr->ibmr.type = IB_MR_TYPE_DMA;
 }
 
+static bool is_pmem_page(struct page *pg)
+{
+	unsigned long paddr = page_to_phys(pg);;
+
+	return REGION_INTERSECTS ==
+	       region_intersects(paddr, PAGE_SIZE, IORESOURCE_MEM,
+				 IORES_DESC_PERSISTENT_MEMORY);
+}
+
 int rxe_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length, u64 iova,
 		     int access, struct rxe_mr *mr)
 {
@@ -148,16 +157,25 @@ int rxe_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length, u64 iova,
 	num_buf			= 0;
 	map = mr->map;
 	if (length > 0) {
-		buf = map[0]->buf;
+		bool persistent_access = access & IB_ACCESS_FLUSH_PERSISTENT;
 
+		buf = map[0]->buf;
 		for_each_sgtable_page (&umem->sgt_append.sgt, &sg_iter, 0) {
+			struct page *pg = sg_page_iter_page(&sg_iter);
+
+			if (persistent_access && !is_pmem_page(pg)) {
+				pr_debug("Unable to register persistent access to non-pmem device\n");
+				err = -EINVAL;
+				goto err_release_umem;
+			}
+
 			if (num_buf >= RXE_BUF_PER_MAP) {
 				map++;
 				buf = map[0]->buf;
 				num_buf = 0;
 			}
 
-			vaddr = page_address(sg_page_iter_page(&sg_iter));
+			vaddr = page_address(pg);
 			if (!vaddr) {
 				pr_warn("%s: Unable to get virtual address\n",
 						__func__);
-- 
2.31.1