forked from luck/tmp_suning_uos_patched
8e907ed488
User-space may invoke ibv_reg_mr and ibv_dereg_mr in different threads.
If ibv_dereg_mr is called after the thread which invoked ibv_reg_mr has
exited, get_pid_task will return NULL and ib_umem_release will not
decrease mm->pinned_vm.
Instead of using threads to locate the mm, use the overall tgid from the
ib_ucontext struct instead. This matches the behavior of ODP and
disassociate in handling the mm of the process that called ibv_reg_mr.
Cc: <stable@vger.kernel.org>
Fixes: 87773dd56d ("IB: ib_umem_release() should decrement mm->pinned_vm from ib_umem_get")
Signed-off-by: Lidong Chen <lidongchen@tencent.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/*
|
|
* Copyright (c) 2007 Cisco Systems. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#ifndef IB_UMEM_H
|
|
#define IB_UMEM_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
struct ib_ucontext;
|
|
struct ib_umem_odp;
|
|
|
|
struct ib_umem {
|
|
struct ib_ucontext *context;
|
|
size_t length;
|
|
unsigned long address;
|
|
int page_shift;
|
|
int writable;
|
|
int hugetlb;
|
|
struct work_struct work;
|
|
struct mm_struct *mm;
|
|
unsigned long diff;
|
|
struct ib_umem_odp *odp_data;
|
|
struct sg_table sg_head;
|
|
int nmap;
|
|
int npages;
|
|
};
|
|
|
|
/* Returns the offset of the umem start relative to the first page. */
|
|
static inline int ib_umem_offset(struct ib_umem *umem)
|
|
{
|
|
return umem->address & (BIT(umem->page_shift) - 1);
|
|
}
|
|
|
|
/* Returns the first page of an ODP umem. */
|
|
static inline unsigned long ib_umem_start(struct ib_umem *umem)
|
|
{
|
|
return umem->address - ib_umem_offset(umem);
|
|
}
|
|
|
|
/* Returns the address of the page after the last one of an ODP umem. */
|
|
static inline unsigned long ib_umem_end(struct ib_umem *umem)
|
|
{
|
|
return ALIGN(umem->address + umem->length, BIT(umem->page_shift));
|
|
}
|
|
|
|
static inline size_t ib_umem_num_pages(struct ib_umem *umem)
|
|
{
|
|
return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift;
|
|
}
|
|
|
|
#ifdef CONFIG_INFINIBAND_USER_MEM
|
|
|
|
struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
|
|
size_t size, int access, int dmasync);
|
|
void ib_umem_release(struct ib_umem *umem);
|
|
int ib_umem_page_count(struct ib_umem *umem);
|
|
int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
|
|
size_t length);
|
|
|
|
#else /* CONFIG_INFINIBAND_USER_MEM */
|
|
|
|
#include <linux/err.h>
|
|
|
|
static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context,
|
|
unsigned long addr, size_t size,
|
|
int access, int dmasync) {
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
static inline void ib_umem_release(struct ib_umem *umem) { }
|
|
static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
|
|
static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
|
|
size_t length) {
|
|
return -EINVAL;
|
|
}
|
|
#endif /* CONFIG_INFINIBAND_USER_MEM */
|
|
|
|
#endif /* IB_UMEM_H */
|