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gpu: nvgpu: serialize debug session IOCTLs

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Hold debug_s->ioctl_lock for all debug session
IOCTLs to prevent multi-threaded user space
IOCTL calls

debug session IOCTL calls are not thread-safe
and hence this serialization is required

Bug 1832267

Change-Id: I847ac951601d4f0093546b592bdb8c8f00185317
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1286436
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
This commit is contained in:
Deepak Nibade
2017-01-17 11:30:12 +05:30
committed by mobile promotions
parent 4942cc4222
commit 72f27f7747
2 changed files with 10 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.c
View File

@@ -1,7 +1,7 @@
/*
* Tegra GK20A GPU Debugger/Profiler Driver
*
* Copyright (c) 2013-2016, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2013-2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -117,6 +117,7 @@ static int gk20a_dbg_gpu_do_dev_open(struct inode *inode,
init_waitqueue_head(&dbg_session->dbg_events.wait_queue);
INIT_LIST_HEAD(&dbg_session->ch_list);
mutex_init(&dbg_session->ch_list_lock);
mutex_init(&dbg_session->ioctl_lock);
dbg_session->dbg_events.events_enabled = false;
dbg_session->dbg_events.num_pending_events = 0;
@@ -899,6 +900,9 @@ long gk20a_dbg_gpu_dev_ioctl(struct file *filp, unsigned int cmd,
gk20a_idle(g->dev);
}
/* protect from threaded user space calls */
mutex_lock(&dbg_s->ioctl_lock);
switch (cmd) {
case NVGPU_DBG_GPU_IOCTL_BIND_CHANNEL:
err = dbg_bind_channel_gk20a(dbg_s,
@@ -1003,6 +1007,8 @@ long gk20a_dbg_gpu_dev_ioctl(struct file *filp, unsigned int cmd,
break;
}
mutex_unlock(&dbg_s->ioctl_lock);
gk20a_dbg(gpu_dbg_gpu_dbg, "ret=%d", err);
if ((err == 0) && (_IOC_DIR(cmd) & _IOC_READ))

4
drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
View File

@@ -1,7 +1,7 @@
/*
* Tegra GK20A GPU Debugger Driver
*
* Copyright (c) 2013-2016, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2013-2017, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -73,6 +73,8 @@ struct dbg_session_gk20a {
struct dbg_gpu_session_events dbg_events;
bool broadcast_stop_trigger;
struct mutex ioctl_lock;
};
struct dbg_session_data {