From 1c40d09c4c9c011c1318c328c0b4b6b17d1f537e Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Wed, 19 Aug 2015 14:27:51 -0700 Subject: 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 Reviewed-on: http://git-master/r/1022737 GVS: Gerrit_Virtual_Submit Reviewed-by: Terje Bergstrom --- drivers/gpu/nvgpu/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/gpu/nvgpu/Kconfig') diff --git a/drivers/gpu/nvgpu/Kconfig b/drivers/gpu/nvgpu/Kconfig index d0e25aa2..94173976 100644 --- a/drivers/gpu/nvgpu/Kconfig +++ b/drivers/gpu/nvgpu/Kconfig @@ -54,6 +54,16 @@ config GK20A_CYCLE_STATS help Say Y here to enable the cycle stats debugging features. +config GK20A_CTXSW_TRACE + bool "Support GK20A Context Switch tracing" + depends on GK20A + default n + help + Enable support for the GK20A Context Switch Tracing. In this mode, + FECS collects timestamps for contexts loaded on GR engine. This + allows tracking context switches on GR engine, as well as + identifying processes that submitted work. + config TEGRA_GK20A bool "Enable the GK20A GPU on Tegra" depends on TEGRA_GRHOST || TEGRA_HOST1X -- cgit v1.2.2