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RDMA/rxe: Allow registering persistent flag for pmem MR only

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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.

Link: https://lore.kernel.org/r/20221206130201.30986-5-lizhijian@fujitsu.com
CC: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Li Zhijian 2022-12-06 21:01:55 +08:00 committed by Jason Gunthorpe
parent 668ce52d5e
commit 02ea0a5115
1 changed files with 20 additions and 2 deletions
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22
drivers/infiniband/sw/rxe/rxe_mr.c
View file

@ -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;