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gpu: nvgpu: Enabling/disabling FECS trace support

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- To enable FECS trace support, nvgpu should set the MSB
of the read pointer (MAILBOX1).
- The ucode will check if the feature is enabled/disabled
before writing a record into the circular buffer. If the
feature is disabled, it will not write the record.
- If the feature is enabled and the buffer is not allocated,
HW will throw a page fault error.

Bug 2459186
Bug 200542611

Change-Id: I6f181643737d1cf1bda02077eaa714a3f4ef3d8c
Signed-off-by: seshendra <sgadagottu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2189250
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
seshendra
2019-09-03 10:47:41 -07:00
committed by mobile promotions
parent f57cf74d57
commit 07ddc5aaad
7 changed files with 74 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
View File

@@ -1,5 +1,5 @@
/*
* Copyright (c) 2016-2018, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2016-2019, 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"),
@@ -362,6 +362,11 @@ int gk20a_fecs_trace_poll(struct gk20a *g)
/* Ensure all FECS writes have made it to SYSMEM */
g->ops.mm.fb_flush(g);
if (nvgpu_is_enabled(g, NVGPU_FECS_TRACE_FEATURE_CONTROL)) {
/* Bits 30:0 of MAILBOX1 represents actual read pointer value */
read = read & (~(BIT32(NVGPU_FECS_TRACE_FEATURE_CONTROL_BIT)));
}
while (read != write) {
cnt = gk20a_fecs_trace_ring_read(g, read);
if (cnt <= 0)
@@ -371,6 +376,15 @@ int gk20a_fecs_trace_poll(struct gk20a *g)
read = (read + 1) & (GK20A_FECS_TRACE_NUM_RECORDS - 1);
}
if (nvgpu_is_enabled(g, NVGPU_FECS_TRACE_FEATURE_CONTROL)) {
/*
* In the next step, read pointer is going to be updated.
* So, MSB of read pointer should be set back to 1. This will
* keep FECS trace enabled.
*/
read = read | (BIT32(NVGPU_FECS_TRACE_FEATURE_CONTROL_BIT));
}
/* ensure FECS records has been updated before incrementing read index */
nvgpu_wmb();
gk20a_fecs_trace_set_read_index(g, read);
@@ -606,8 +620,30 @@ int gk20a_fecs_trace_enable(struct gk20a *g)
if (g->ops.fecs_trace.flush)
g->ops.fecs_trace.flush(g);
write = gk20a_fecs_trace_get_write_index(g);
if (nvgpu_is_enabled(g, NVGPU_FECS_TRACE_FEATURE_CONTROL)) {
/*
* For enabling FECS trace support, MAILBOX1's MSB
* (Bit 31:31) should be set to 1. Bits 30:0 represents
* actual pointer value.
*/
write = write |
(BIT32(NVGPU_FECS_TRACE_FEATURE_CONTROL_BIT));
}
gk20a_fecs_trace_set_read_index(g, write);
/*
* FECS ucode does a priv holdoff around the assertion of
* context reset. So, pri transactions (e.g. mailbox1 register
* write) might fail due to this. Hence, do write with ack
* i.e. write and read it back to make sure write happened for
* mailbox1.
*/
while (gk20a_fecs_trace_get_read_index(g) != write) {
nvgpu_log(g, gpu_dbg_ctxsw, "mailbox1 update failed");
gk20a_fecs_trace_set_read_index(g, write);
}
err = nvgpu_thread_create(&trace->poll_task, g,
gk20a_fecs_trace_periodic_polling, __func__);
if (err) {
@@ -622,10 +658,35 @@ int gk20a_fecs_trace_enable(struct gk20a *g)
int gk20a_fecs_trace_disable(struct gk20a *g)
{
struct gk20a_fecs_trace *trace = g->fecs_trace;
int read = 0;
if (nvgpu_thread_is_running(&trace->poll_task))
nvgpu_thread_stop(&trace->poll_task);
if (nvgpu_is_enabled(g, NVGPU_FECS_TRACE_FEATURE_CONTROL)) {
/*
* For disabling FECS trace support, MAILBOX1's MSB
* (Bit 31:31) should be set to 0.
*/
read = gk20a_fecs_trace_get_read_index(g) &
(~(BIT32(NVGPU_FECS_TRACE_FEATURE_CONTROL_BIT)));
gk20a_fecs_trace_set_read_index(g, read);
/*
* FECS ucode does a priv holdoff around the assertion
* of context reset. So, pri transactions (e.g.
* mailbox1 register write) might fail due to this.
* Hence, do write with ack i.e. write and read it back
* to make sure write happened for mailbox1.
*/
while (gk20a_fecs_trace_get_read_index(g) != read) {
nvgpu_log(g, gpu_dbg_ctxsw,
"mailbox1 update failed");
gk20a_fecs_trace_set_read_index(g, read);
}
}
return -EPERM;
}