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, 4 insertions, 0 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index b85ca7b6..446f5bd3 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -1286,8 +1286,12 @@ struct nvgpu_dbg_gpu_set_next_stop_trigger_type_args {
 
 
 /* PM Context Switch Mode */
+/*This mode says that the pms are not to be context switched. */
 #define NVGPU_DBG_GPU_HWPM_CTXSW_MODE_NO_CTXSW               (0x00000000)
+/* This mode says that the pms in Mode-B are to be context switched */
 #define NVGPU_DBG_GPU_HWPM_CTXSW_MODE_CTXSW                  (0x00000001)
+/* This mode says that the pms in Mode-E (stream out) are to be context switched. */
+#define NVGPU_DBG_GPU_HWPM_CTXSW_MODE_STREAM_OUT_CTXSW       (0x00000002)
 
 struct nvgpu_dbg_gpu_hwpm_ctxsw_mode_args {
         __u32 mode;