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Create device nodes for user-created scheduling domains. This helps leverage filesystem based access control: domains can be chosen to be available for a limited set of users on a system. The device nodes are dynamic: they can be removed while the driver is running normally. This is a bit different from the nodes that exist until the driver is unloaded, so the devno/domain mapping is stored in a separate list. The usual container_of pattern would suffer from an unavoidable race condition if a domain file was opened while the same domain would get removed. As usual, domain refcounting prevents a domain from being removed. Now the open device files hold refs and thus any open domain files prevent a domain from getting removed, in addition to the userspace-invisible ref that is taken when a TSG is bound to a domain. While at it, make the query ioctl guarded by the sched domain mutex, as domains might technically get added or removed during the querying code. Jira NVGPU-6788 Change-Id: Ief2a09a442c4e70f1f2be8a32359341071d74659 Signed-off-by: Konsta Hölttä <kholtta@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2651164 Reviewed-by: Alex Waterman <alexw@nvidia.com> GVS: Gerrit_Virtual_Submit
30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
/*
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* Copyright (c) 2021-2022, NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef NVGPU_OS_LINUX_IOCTL_NVS_H
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#define NVGPU_OS_LINUX_IOCTL_NVS_H
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#include <nvgpu/types.h>
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struct inode;
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struct file;
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int nvgpu_nvs_dev_open(struct inode *inode, struct file *filp);
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int nvgpu_nvs_dev_release(struct inode *inode, struct file *filp);
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long nvgpu_nvs_dev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
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ssize_t nvgpu_nvs_dev_read(struct file *filp, char __user *buf,
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size_t size, loff_t *off);
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struct nvgpu_nvs_domain *nvgpu_nvs_domain_get_from_file(int fd);
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#endif
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