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gpu: nvgpu: async cmd resp for gv11b

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- When DISALLOW cmd is sent from driver to PMU the actual
  completion of the disallow will be acknowledged by PMU
  via a PG EVENT: ASYNC_CMD_RESP.
- Disallow needs a delayed ACK from PMU in order to disable
  the ELPG.
- If ELPG is already engaged, the DISALLOW cmd will trigger
  ELPG exit and then transition to PMU_PG_STATE_DISALLOW.
- After this whole process is completed, PMU will send
  DISALLOW_ACK through ASYNC_CMD_RESP msg.
- After disallow command is sent from the driver, NvGPU driver
  waits/polls for disallow command ack. This is sent immediately
  by msg framework of PMU.
- Then, the driver will poll/wait for ASYNC_CMD_RESP event which
  is the delayed DISALLOW ACK.
- The driver captures the ASYNC_CMD_RESP sent from PMU.
- set disallow_state to ELPG_OFF.
- If the driver does not wait/poll for this delayed disallow
  ack from PMU, it can result in erros  as PMU is still
  processing DISALLOW cmd but the driver progressed further.

Bug 3580271

Change-Id: I332180c05b6a398107f065d54e9718b7038fb1b2
Signed-off-by: Divya <dsinghatwari@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2689500
Reviewed-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Divya
2022-03-29 19:18:49 +00:00
committed by mobile promotions
parent 43ba356132
commit fb019bf43a
6 changed files with 43 additions and 10 deletions
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4
drivers/gpu/nvgpu/include/nvgpu/pmu/pmu_pg.h
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2019-2021, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2019-2022, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -128,7 +128,7 @@ struct nvgpu_pmu_pg {
void (*rpc_handler)(struct gk20a *g, struct nvgpu_pmu *pmu,
struct nv_pmu_rpc_header *rpc, struct rpc_handler_payload *rpc_payload);
int (*init_send)(struct gk20a *g, struct nvgpu_pmu *pmu, u8 pg_engine_id);
int (*process_rpc_event)(struct gk20a *g, void *pmumsg);
int (*process_pg_event)(struct gk20a *g, void *pmumsg);
};
/*PG defines used by nvpgu-pmu*/

9
drivers/gpu/nvgpu/include/nvgpu/pmu/pmuif/pg.h
View File

@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017-2021, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2017-2022, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
@@ -117,12 +117,19 @@ struct pmu_pg_msg_eng_buf_stat {
u8 status;
};
struct pmu_pg_msg_async_cmd_resp {
u8 msg_type;
u8 ctrl_id;
u8 msg_id;
};
struct pmu_pg_msg {
union {
u8 msg_type;
struct pmu_pg_msg_elpg_msg elpg_msg;
struct pmu_pg_msg_stat stat;
struct pmu_pg_msg_eng_buf_stat eng_buf_stat;
struct pmu_pg_msg_async_cmd_resp async_cmd_resp;
/* TBD: other pg messages */
union pmu_ap_msg ap_msg;
struct nv_pmu_rppg_msg rppg_msg;