gpu: nvgpu: nvgpu_thread to handle PMU state changes

- Replaced schedule_worker() with nvgpu_thread along
with nvgpu_cond_wait() to handle PMU state machine
changes during boot.

- Added new state "PMU_STATE_EXIT" to exit
PMU state machine loop & wait for the
thread stop signal.

- In gk20a_init_pmu_setup_sw() thread creates &
starts thread execution to handle PMU state changes.

- In pmu_destroy() thread post PMU_STATE_EXIT
& waits for pending operation to complete
before thread destroy.

JIRA NVGPU-56

Change-Id: I951208bf88e82c281e3e678ddc603d58aec5ab10
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: http://git-master/r/1487882
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.h b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.h
index cefb6577..cfcf3947 100644
--- a/drivers/gpu/nvgpu/gk20a/pmu_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/pmu_gk20a.h
@@ -307,8 +307,13 @@ struct pmu_pg_stats_data {
 #define PMU_STATE_LOADING_PG_BUF        5 /* Loading PG buf */
 #define PMU_STATE_LOADING_ZBC           6 /* Loading ZBC buf */
 #define PMU_STATE_STARTED               7 /* Fully unitialized */
+#define PMU_STATE_EXIT                  8 /* Exit PMU state machine */
 
-
+struct nvgpu_pg_init {
+        bool state_change;
+        struct nvgpu_cond wq;
+        struct nvgpu_thread state_task;
+};
 
 struct pmu_gk20a {
 
@@ -356,7 +361,7 @@ struct pmu_gk20a {
         int pmu_state;
 
 #define PMU_ELPG_ENABLE_ALLOW_DELAY_MSEC        1 /* msec */
-        struct work_struct pg_init;
+        struct nvgpu_pg_init pg_init;
         struct nvgpu_mutex pg_mutex; /* protect pg-RPPG/MSCG enable/disable */
         struct nvgpu_mutex elpg_mutex; /* protect elpg enable/disable */
         int elpg_refcnt; /* disable -1, enable +1, <=0 elpg disabled, > 0 elpg enabled */
@@ -440,7 +445,6 @@ int pmu_bootstrap(struct pmu_gk20a *pmu);
 int gk20a_init_pmu(struct pmu_gk20a *pmu);
 void pmu_dump_falcon_stats(struct pmu_gk20a *pmu);
 void gk20a_remove_pmu_support(struct pmu_gk20a *pmu);
-void pmu_setup_hw(struct work_struct *work);
 void pmu_seq_init(struct pmu_gk20a *pmu);
 
 int gk20a_init_pmu(struct pmu_gk20a *pmu);