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RDMA/rxe: Allow queue VMAs to outlive ucontexts

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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 <jiri@nvidia.com>
Link: https://patch.msgid.link/20260716132316.1495242-13-jiri@resnulli.us
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Jiri Pirko 2026-07-16 15:23:13 +02:00 committed by Leon Romanovsky
parent 625ca0d94c
commit 22fe73aef3
1 changed files with 2 additions and 33 deletions
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35
drivers/infiniband/sw/rxe/rxe_mmap.c
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@ -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;