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RDMA/uverbs: Hoist the common process of disassociate_ucontext into ib core 

This patch hoisted the common process of disassociate_ucontext
callback function into ib core code, and these code are common
to ervery ib_device driver.

Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Acked-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
hifive-unleashed-5.1
Wei Hu(Xavier) 2018-05-28 19:39:26 +08:00 committed by Doug Ledford
parent 0b25c9cc53
commit a0976f418d
3 changed files with 41 additions and 69 deletions
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42
drivers/infiniband/core/uverbs_main.c
View File

@ -41,6 +41,8 @@
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/sched/task.h>
#include <linux/file.h>
#include <linux/cdev.h>
#include <linux/anon_inodes.h>
@ -1090,6 +1092,44 @@ err:
return;
}
static void ib_uverbs_disassociate_ucontext(struct ib_ucontext *ibcontext)
{
struct ib_device *ib_dev = ibcontext->device;
struct task_struct *owning_process = NULL;
struct mm_struct *owning_mm = NULL;
owning_process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
if (!owning_process)
return;
owning_mm = get_task_mm(owning_process);
if (!owning_mm) {
pr_info("no mm, disassociate ucontext is pending task termination\n");
while (1) {
put_task_struct(owning_process);
usleep_range(1000, 2000);
owning_process = get_pid_task(ibcontext->tgid,
PIDTYPE_PID);
if (!owning_process ||
owning_process->state == TASK_DEAD) {
pr_info("disassociate ucontext done, task was terminated\n");
/* in case task was dead need to release the
* task struct.
*/
if (owning_process)
put_task_struct(owning_process);
return;
}
}
}
down_write(&owning_mm->mmap_sem);
ib_dev->disassociate_ucontext(ibcontext);
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);
}
static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
struct ib_device *ib_dev)
{
@ -1130,7 +1170,7 @@ static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
* (e.g mmput).
*/
ib_uverbs_event_handler(&file->event_handler, &event);
ib_dev->disassociate_ucontext(ucontext);
ib_uverbs_disassociate_ucontext(ucontext);
mutex_lock(&file->cleanup_mutex);
ib_uverbs_cleanup_ucontext(file, ucontext, true);
mutex_unlock(&file->cleanup_mutex);

34
drivers/infiniband/hw/mlx4/main.c
View File

@ -1189,40 +1189,10 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
int ret = 0;
struct vm_area_struct *vma;
struct mlx4_ib_ucontext *context = to_mucontext(ibcontext);
struct task_struct *owning_process = NULL;
struct mm_struct *owning_mm = NULL;
owning_process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
if (!owning_process)
return;
owning_mm = get_task_mm(owning_process);
if (!owning_mm) {
pr_info("no mm, disassociate ucontext is pending task termination\n");
while (1) {
/* make sure that task is dead before returning, it may
* prevent a rare case of module down in parallel to a
* call to mlx4_ib_vma_close.
*/
put_task_struct(owning_process);
usleep_range(1000, 2000);
owning_process = get_pid_task(ibcontext->tgid,
PIDTYPE_PID);
if (!owning_process ||
owning_process->state == TASK_DEAD) {
pr_info("disassociate ucontext done, task was terminated\n");
/* in case task was dead need to release the task struct */
if (owning_process)
put_task_struct(owning_process);
return;
}
}
}
/* need to protect from a race on closing the vma as part of
* mlx4_ib_vma_close().
*/
down_write(&owning_mm->mmap_sem);
for (i = 0; i < HW_BAR_COUNT; i++) {
vma = context->hw_bar_info[i].vma;
if (!vma)
@ -1241,10 +1211,6 @@ static void mlx4_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
/* context going to be destroyed, should not access ops any more */
context->hw_bar_info[i].vma->vm_ops = NULL;
}
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);
}
static void mlx4_ib_set_vma_data(struct vm_area_struct *vma,

34
drivers/infiniband/hw/mlx5/main.c
View File

@ -1973,38 +1973,7 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
struct vm_area_struct *vma;
struct mlx5_ib_vma_private_data *vma_private, *n;
struct mlx5_ib_ucontext *context = to_mucontext(ibcontext);
struct task_struct *owning_process = NULL;
struct mm_struct *owning_mm = NULL;
owning_process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
if (!owning_process)
return;
owning_mm = get_task_mm(owning_process);
if (!owning_mm) {
pr_info("no mm, disassociate ucontext is pending task termination\n");
while (1) {
put_task_struct(owning_process);
usleep_range(1000, 2000);
owning_process = get_pid_task(ibcontext->tgid,
PIDTYPE_PID);
if (!owning_process ||
owning_process->state == TASK_DEAD) {
pr_info("disassociate ucontext done, task was terminated\n");
/* in case task was dead need to release the
* task struct.
*/
if (owning_process)
put_task_struct(owning_process);
return;
}
}
}
/* need to protect from a race on closing the vma as part of
* mlx5_ib_vma_close.
*/
down_write(&owning_mm->mmap_sem);
mutex_lock(&context->vma_private_list_mutex);
list_for_each_entry_safe(vma_private, n, &context->vma_private_list,
list) {
@ -2021,9 +1990,6 @@ static void mlx5_ib_disassociate_ucontext(struct ib_ucontext *ibcontext)
kfree(vma_private);
}
mutex_unlock(&context->vma_private_list_mutex);
up_write(&owning_mm->mmap_sem);
mmput(owning_mm);
put_task_struct(owning_process);
}
static inline char *mmap_cmd2str(enum mlx5_ib_mmap_cmd cmd)