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From: Jason Gunthorpe <jgg@ziepe.ca>
To: "Wei Hu (Xavier)" <xavier.huwei@huawei.com>
Cc: dledford@redhat.com, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org, xavier.huwei@tom.com,
lijun_nudt@163.com
Subject: Re: [PATCH rdma-next 1/5] RDMA/hns: Implement the disassociate_ucontext API
Date: Thu, 17 May 2018 09:00:19 -0600 [thread overview]
Message-ID: <20180517150019.GB10842@ziepe.ca> (raw)
In-Reply-To: <1526544173-106587-2-git-send-email-xavier.huwei@huawei.com>
On Thu, May 17, 2018 at 04:02:49PM +0800, Wei Hu (Xavier) wrote:
> This patch Implements the IB core disassociate_ucontext API.
>
> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
> drivers/infiniband/hw/hns/hns_roce_main.c | 36 +++++++++++++++++++++++++++++++
> 1 file changed, 36 insertions(+)
>
> diff --git a/drivers/infiniband/hw/hns/hns_roce_main.c b/drivers/infiniband/hw/hns/hns_roce_main.c
> index 96fb6a9..7fafe9d 100644
> +++ b/drivers/infiniband/hw/hns/hns_roce_main.c
> @@ -33,6 +33,9 @@
> #include <linux/acpi.h>
> #include <linux/of_platform.h>
> #include <linux/module.h>
> +#include <linux/sched.h>
> +#include <linux/sched/mm.h>
> +#include <linux/sched/task.h>
> #include <rdma/ib_addr.h>
> #include <rdma/ib_smi.h>
> #include <rdma/ib_user_verbs.h>
> @@ -422,6 +425,38 @@ static int hns_roce_port_immutable(struct ib_device *ib_dev, u8 port_num,
> return 0;
> }
>
> +static void hns_roce_disassociate_ucontext(struct ib_ucontext *ibcontext)
> +{
> + struct task_struct *process;
> + struct mm_struct *mm;
> +
> + process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
> + if (!process)
> + return;
> +
> + mm = get_task_mm(process);
> + if (!mm) {
> + pr_info("no mm, disassociate ucontext is pending task termination\n");
> + while (1) {
> + put_task_struct(process);
> + usleep_range(1000, 2000);
> + process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
> + if (!process || process->state == TASK_DEAD) {
> + pr_info("disassociate ucontext done, task was terminated\n");
> + /* if task was dead, need to release the task
> + * struct.
> + */
> + if (process)
> + put_task_struct(process);
> + return;
> + }
> + }
> + }
I don't want to see this boilerplate code copied into every
driver. Hoist it into the core code, have the disassociate driver callback
accept a mm_struct parameter, and refactor the other drivers using this.
> + mmput(mm);
> + put_task_struct(process);
> +}
This can't be right, disassociate requires the driver to replace all
the mmaps it make to user space with the 0 page, I see hns does use
mmaps, so it must zap them here.
Jason
next prev parent reply other threads:[~2018-05-17 15:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-17 8:02 [PATCH rdma-next 0/5] Misc update for hns driver Wei Hu (Xavier)
2018-05-17 8:02 ` [PATCH rdma-next 1/5] RDMA/hns: Implement the disassociate_ucontext API Wei Hu (Xavier)
2018-05-17 15:00 ` Jason Gunthorpe [this message]
2018-05-19 8:24 ` Wei Hu (Xavier)
2018-05-22 20:21 ` Jason Gunthorpe
2018-05-23 9:33 ` Wei Hu (Xavier)
2018-05-17 8:02 ` [PATCH rdma-next 2/5] RDMA/hns: Modify uar allocation algorithm to avoid bitmap exhaust Wei Hu (Xavier)
2018-05-23 6:05 ` Leon Romanovsky
2018-05-23 6:49 ` Wei Hu (Xavier)
2018-05-23 7:00 ` Leon Romanovsky
2018-05-23 7:12 ` Wei Hu (Xavier)
2018-05-23 7:22 ` Leon Romanovsky
2018-05-17 8:02 ` [PATCH rdma-next 3/5] RDMA/hns: Increase checking CMQ status timeout value Wei Hu (Xavier)
2018-05-23 5:49 ` Leon Romanovsky
2018-05-23 6:09 ` Wei Hu (Xavier)
2018-05-23 6:15 ` Wei Hu (Xavier)
2018-05-23 6:23 ` Leon Romanovsky
2018-05-17 8:02 ` [PATCH rdma-next 4/5] RDMA/hns: Add reset process for RoCE in hip08 Wei Hu (Xavier)
2018-05-17 15:14 ` Jason Gunthorpe
2018-05-18 3:28 ` Wei Hu (Xavier)
2018-05-18 4:15 ` Jason Gunthorpe
2018-05-18 7:23 ` Wei Hu (Xavier)
2018-05-22 20:26 ` Jason Gunthorpe
2018-05-23 2:54 ` Wei Hu (Xavier)
2018-05-23 3:47 ` Jason Gunthorpe
2018-05-23 9:35 ` Wei Hu (Xavier)
2018-05-23 3:49 ` Wei Hu (Xavier)
2018-05-17 8:02 ` [PATCH rdma-next 5/5] RDMA/hns: Fix the illegal memory operation when cross page Wei Hu (Xavier)
2018-05-23 6:17 ` Leon Romanovsky
2018-05-23 6:38 ` Wei Hu (Xavier)
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