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gpu: nvgpu: enable semaphore acquire timeout

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It'll detect dead semaphore acquire. The worst case is when
ACQUIRE_SWITCH is disabled, semaphore acquire will poll and
consume full gpu timeslicees.

The timeout value is set to half of channel WDT.

Bug 1636800

Change-Id: Ida6ccc534006a191513edf47e7b82d4b5b758684
Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-on: http://git-master/r/928827
GVS: Gerrit_Virtual_Submit
Reviewed-by: Vladislav Buzov <vbuzov@nvidia.com>
This commit is contained in:
Richard Zhao
2016-01-04 10:28:04 -08:00
committed by Vladislav Buzov
parent 3484fd0d13
commit a9c6f59539
5 changed files with 87 additions and 10 deletions
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8
drivers/gpu/nvgpu/gk20a/fifo_gk20a.c
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@@ -1,7 +1,7 @@
/*
* GK20A Graphics FIFO (gr host)
*
* Copyright (c) 2011-2015, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2011-2016, 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,
@@ -1642,6 +1642,12 @@ static u32 gk20a_fifo_handle_pbdma_intr(struct device *dev,
pbdma_intr_0);
}
if (pbdma_intr_0 & pbdma_intr_0_acquire_pending_f()) {
u32 val = gk20a_readl(g, pbdma_acquire_r(pbdma_id));
val &= ~pbdma_acquire_timeout_en_enable_f();
gk20a_writel(g, pbdma_acquire_r(pbdma_id), val);
}
if (pbdma_intr_0 & pbdma_intr_0_pbentry_pending_f()) {
gk20a_fifo_reset_pbdma_header(g, pbdma_id);
gk20a_fifo_reset_pbdma_method(g, pbdma_id, 0);