[PATCH rdma-next v3 12/14] RDMA/rxe: Allow queue VMAs to outlive ucontexts
From: Jiri Pirko <jiri@resnulli.us>
Date: 2026-07-16 13:24:09
Also in:
cgroups, linux-kselftest, linux-rdma, linux-s390
Subsystem:
infiniband subsystem, soft-roce driver (rxe), the rest · Maintainers:
Jason Gunthorpe, Leon Romanovsky, Zhu Yanjun, Linus Torvalds
From: Jiri Pirko <redacted> Prepare queue mappings for asynchronous ucontext disassociation during device disable. Rely on the VMA page references to preserve mapped memory until the final unmap. Signed-off-by: Jiri Pirko <redacted> --- v1->v2: - new patch --- drivers/infiniband/sw/rxe/rxe_mmap.c | 35 ++-------------------------- 1 file changed, 2 insertions(+), 33 deletions(-)
diff --git a/drivers/infiniband/sw/rxe/rxe_mmap.c b/drivers/infiniband/sw/rxe/rxe_mmap.c
index 7f723a2f3700..a4ead89ccbd3 100644
--- a/drivers/infiniband/sw/rxe/rxe_mmap.c
+++ b/drivers/infiniband/sw/rxe/rxe_mmap.c@@ -11,7 +11,6 @@ #include "rxe.h" #include "rxe_loc.h" -#include "rxe_queue.h" void rxe_mmap_release(struct kref *ref) {
@@ -30,29 +29,6 @@ void rxe_mmap_release(struct kref *ref) kfree(ip); } -/* - * open and close keep track of how many times the memory region is mapped, - * to avoid releasing it. - */ -static void rxe_vma_open(struct vm_area_struct *vma) -{ - struct rxe_mmap_info *ip = vma->vm_private_data; - - kref_get(&ip->ref); -} - -static void rxe_vma_close(struct vm_area_struct *vma) -{ - struct rxe_mmap_info *ip = vma->vm_private_data; - - kref_put(&ip->ref, rxe_mmap_release); -} - -static const struct vm_operations_struct rxe_vm_ops = { - .open = rxe_vma_open, - .close = rxe_vma_close, -}; - /** * rxe_mmap - create a new mmap region * @context: the IB user context of the process making the mmap() call
@@ -106,17 +82,10 @@ int rxe_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) list_del_init(&ip->pending_mmaps); spin_unlock_bh(&rxe->pending_lock); - vma->vm_ops = &rxe_vm_ops; - vma->vm_private_data = ip; - ret = remap_vmalloc_range(vma, ip->obj, 0); - if (ret) { - vma->vm_private_data = NULL; - vma->vm_ops = NULL; - kref_put(&ip->ref, rxe_mmap_release); + kref_put(&ip->ref, rxe_mmap_release); + if (ret) rxe_dbg_dev(rxe, "err %d from remap_vmalloc_range\n", ret); - goto done; - } done: return ret;
--
2.54.0