@@ -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)
{
@@ -146,16 +155,25 @@ 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)) {
+ rxe_dbg_mr(mr, "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) {
rxe_dbg_mr(mr, "Unable to get virtual address\n");
err = -ENOMEM;
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 registering a persistent access flag to a non-pmem MR will be rejected. CC: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Li Zhijian <lizhijian@fujitsu.com> --- V7: pr_debug -> rxe_dbg_mr 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(-)