mirror of
git://nv-tegra.nvidia.com/linux-nvgpu.git
synced 2025-12-22 09:12:24 +03:00
52 lines
2.0 KiB
C
52 lines
2.0 KiB
C
/*
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* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <nvgpu/log.h>
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#include <nvgpu/channel.h>
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#include "hal/fifo/tsg_gk20a.h"
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int gk20a_tsg_unbind_channel_check_hw_next(struct nvgpu_channel *ch,
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struct nvgpu_channel_hw_state *hw_state)
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{
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if (hw_state->next) {
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/*
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* There is a possibility that the user sees the channel
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* has finished all the work and invokes channel removal
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* before the scheduler marks it idle (clears NEXT bit).
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* Scheduler can miss marking the channel idle if the
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* timeslice expires just after the work finishes.
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*
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* nvgpu will then see NEXT bit set even though the
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* channel has no work left. To catch this case,
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* reenable the tsg and check the hw state again
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* to see if the channel is truly idle.
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*/
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nvgpu_log_info(ch->g, "Channel %d to be removed "
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"from TSG %d has NEXT set!",
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ch->chid, ch->tsgid);
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return -EAGAIN;
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}
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return 0;
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}
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