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gpu: nvgpu: limit number of gpfifo entries

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Limit number of gpfifo entries so that the size of gpfifo i.e.
num_entries * size of each entry fits in u32 data type.

Jira NVGPU-5846

Change-Id: I4d3560a6ed90044c88ee3a7acd2e6cb0591b7c5e
Signed-off-by: shashank singh <shashsingh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2474118
(cherry picked from commit 02ab9e163f5b413b6eb9817ab8ac5581ce7ef427)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2483947
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Dinesh T <dt@nvidia.com>
Reviewed-by: Ankur Kishore <ankkishore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
shashank singh
2021-02-08 18:15:25 +05:30
committed by mobile promotions
parent ed739cdba1
commit 019641e88c
2 changed files with 75 additions and 0 deletions
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10
include/uapi/linux/nvgpu.h
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@@ -694,6 +694,16 @@ struct nvgpu_alloc_gpfifo_ex_args {
* Setup the channel and bind it (enable).
*/
struct nvgpu_channel_setup_bind_args {
/*
* Must be power of 2. Max value U32_MAX/8 (size of gpfifo entry) rounded of to
* nearest lower power of 2 i.e. 2^28. The lower limit is due to the fact that
* the last entry of gpfifo is kept empty and used to determine buffer empty or
* full condition. Additionally, kmd submit uses pre/post sync which needs
* another extra entry.
* Range: 2, 4, 8, ..., 2^28 when
* NVGPU_CHANNEL_SETUP_BIND_FLAGS_USERMODE_SUPPORT is set.
* Range: 4, 8, 16, ..., 2^28 otherwise.
*/
__u32 num_gpfifo_entries;
__u32 num_inflight_jobs;
/* Set owner channel of this gpfifo as a vpr channel. */