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gpu: nvgpu: track cdev minor numbers

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The existing Linux character device nodes are statically configured
once. For other dynamically created devices, track the next minor number
in nvgpu_os_linux as a rudimentary allocator.

Only a small number of increments are expected at this time; in the
future, a bitmap might be more appropriate for tracking out-of-order
deallocations too.

Jira NVGPU-6788

Change-Id: I016ee8471313086620f9ab371583d6763848b0e2
Signed-off-by: Konsta Hölttä <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2651163
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Konsta Hölttä
2022-02-23 12:09:34 +02:00
committed by mobile promotions
parent 79b37d7832
commit 82df5b0219
3 changed files with 14 additions and 2 deletions
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3
drivers/gpu/nvgpu/os/linux/os_linux.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017-2021, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2017-2022, 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,
@@ -87,6 +87,7 @@ struct nvgpu_os_linux {
dev_t power_cdev_region;
dev_t cdev_region;
atomic_t next_cdev_minor;
/* see gk20a_ctrl_priv */
struct nvgpu_list_node ctrl_privs;