gpu: nvgpu: Add support for FECS ctxsw tracing

bug 1648908

This commit adds support for FECS ctxsw tracing. Code is compiled
conditionnaly under CONFIG_GK20_CTXSW_TRACE.
This feature requires an updated FECS ucode that writes one record to a ring
buffer on each context switch. On RM/Kernel side, the GPU driver reads records
from the master ring buffer and generates trace entries into a user-facing
VM ring buffer. For each record in the master ring buffer, RM/Kernel has
to retrieve the vmid+pid of the user process that submitted related work.

Features currently implemented:
- master ring buffer allocation
- debugfs to dump master ring buffer
- FECS record per context switch (with both current and new contexts)
- dedicated device for ctxsw tracing (access to VM ring buffer)
- SOF generation (and access to PTIMER)
- VM ring buffer allocation, and reconfiguration
- enable/disable tracing at user level
- event-based trace filtering
- context_ptr to vmid+pid mapping
- read system call for ctxsw dev
- mmap system call for ctxsw dev (direct access to VM ring buffer)
- poll system call for ctxsw dev
- save/restore register on ELPG/CG6
- separate user ring from FECS ring handling

Features requiring ucode changes:
- enable/disable tracing at FECS level
- actual busy time on engine (bug 1642354)
- master ring buffer threshold interrupt (P1)
- API for GPU to CPU timestamp conversion (P1)
- vmid/pid/uid based filtering (P1)

Change-Id: I8e39c648221ee0fa09d5df8524b03dca83fe24f3
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1022737
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/Makefile b/drivers/gpu/nvgpu/Makefile
index 932dde1a..df660eb7 100644
--- a/drivers/gpu/nvgpu/Makefile
+++ b/drivers/gpu/nvgpu/Makefile
@@ -46,6 +46,8 @@ nvgpu-y := \
         gk20a/cde_gk20a.o \
         gk20a/platform_gk20a_generic.o \
         gk20a/tsg_gk20a.o \
+        gk20a/ctxsw_trace_gk20a.o \
+        gk20a/fecs_trace_gk20a.o \
         gk20a/mc_gk20a.o \
         gm20b/hal_gm20b.o \
         gm20b/ltc_gm20b.o \
@@ -64,7 +66,6 @@ nvgpu-y := \
         gm20b/debug_gm20b.o \
         gm20b/cde_gm20b.o \
         gm20b/therm_gm20b.o
-
 nvgpu-$(CONFIG_TEGRA_GK20A) += gk20a/platform_gk20a_tegra.o
 nvgpu-$(CONFIG_SYNC) += gk20a/sync_gk20a.o
 
@@ -78,6 +79,7 @@ nvgpu-$(CONFIG_TEGRA_GR_VIRTUALIZATION) += \
         vgpu/debug_vgpu.o \
         vgpu/vgpu.o \
         vgpu/dbg_vgpu.o \
+        vgpu/fecs_trace_vgpu.o \
         vgpu/gk20a/vgpu_hal_gk20a.o \
         vgpu/gk20a/vgpu_gr_gk20a.o \
         vgpu/gm20b/vgpu_hal_gm20b.o \