gpu: nvgpu: enable HWPM Mode-E context switch

- Write new pm mode to context buffer header. Ucode use
this mode to enable mode-e context switch. This is Mode-B
context switch of PMs with Mode-E streamout on one context.
If this mode is set, Ucode makes sure that Mode-E pipe
(perfmons, routers, pma) is idle before it context switches PMs.
- This allows us to collect counters in a secure way
(i.e. on context basis) with stream out.

Bug 2106999

Change-Id: I5a7435f09d1bf053ca428e538b0a57f3a175ac37
Signed-off-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1760366
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
index d9d07844..50002557 100644
--- a/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/dbg_gpu_gk20a.h
@@ -135,4 +135,13 @@ int gk20a_perfbuf_disable_locked(struct gk20a *g);
 void nvgpu_dbg_session_post_event(struct dbg_session_gk20a *dbg_s);
 u32 nvgpu_set_powergate_locked(struct dbg_session_gk20a *dbg_s,
                                 bool mode);
+
+ /* PM Context Switch Mode */
+/*This mode says that the pms are not to be context switched. */
+#define NVGPU_DBG_HWPM_CTXSW_MODE_NO_CTXSW               (0x00000000)
+/* This mode says that the pms in Mode-B are to be context switched */
+#define NVGPU_DBG_HWPM_CTXSW_MODE_CTXSW                  (0x00000001)
+/* This mode says that the pms in Mode-E (stream out) are to be context switched. */
+#define NVGPU_DBG_HWPM_CTXSW_MODE_STREAM_OUT_CTXSW       (0x00000002)
+
 #endif /* DBG_GPU_GK20A_H */