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gpu: nvgpu: modify priority of NVS worker thread

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In linux threaded interrupts run with a Realtime priority
of 50. This bumps up the priority of bottom-half handlers
over regular kernel/User threads even during process
context.

In the current implementation scheduler thread still
runs in normal kernel thread priority. In order to
allow a seamless scheduling experience, the worker
thread is now created with a Realtime priority of 1.
This allows for the Worker thread to work at a priority
lower than interrupt handlers but higher than the regular
kernel threads.

Linux kernel allows setting priority with the help of
sched_set_fifo() API. Only two modes are supported
i.e. sched_set_fifo() and sched_set_fifo_low().

For more reference, refer to this article
https://lwn.net/Articles/818388/.

Added an implementation of nvgpu_thread_create_priority()
for linux thread using the above two APIs.

Jira NVGPU-860

Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Change-Id: I0a5a611bf0e0a5b9bb51354c6ff0a99e42e76e2f
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2751736
Reviewed-by: Prateek Sethi <prsethi@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Debarshi Dutta
2022-07-27 12:44:16 +05:30
committed by mobile promotions
parent 13699c4c15
commit 1d4b7b1c5d
6 changed files with 173 additions and 7 deletions
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2
drivers/gpu/nvgpu/common/init/nvgpu_init.c
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@@ -895,7 +895,6 @@ int nvgpu_finalize_poweron(struct gk20a *g)
NVGPU_INIT_TABLE_ENTRY(g->ops.mm.init_mm_support, NO_FLAG),
NVGPU_INIT_TABLE_ENTRY(g->ops.fifo.fifo_init_support, NO_FLAG),
NVGPU_INIT_TABLE_ENTRY(nvgpu_nvs_init, NO_FLAG),
NVGPU_INIT_TABLE_ENTRY(g->ops.therm.elcg_init_idle_filters,
NO_FLAG),
NVGPU_INIT_TABLE_ENTRY(&nvgpu_netlist_init_ctx_vars, NO_FLAG),
@@ -982,6 +981,7 @@ int nvgpu_finalize_poweron(struct gk20a *g)
NVGPU_INIT_TABLE_ENTRY(g->ops.pmu.pmu_restore_golden_img_state,
NO_FLAG),
#endif
NVGPU_INIT_TABLE_ENTRY(nvgpu_nvs_init, NO_FLAG),
NVGPU_INIT_TABLE_ENTRY(g->ops.channel.resume_all_serviceable_ch,
NO_FLAG),
#ifndef CONFIG_NVGPU_DGPU