gpu: nvgpu: Add timeouts_disabled_refcount for enabling timeout

-timeouts will be enabled only when timeouts_disabled_refcount
 will reach 0
-timeouts_enabled debugfs will change from u32 type to file type
 to avoid race enabling/disabling timeout from debugfs and ioctl
-unify setting timeouts_enabled from debugfs and ioctl

Bug 1982434

Change-Id: I54bab778f1ae533872146dfb8d80deafd2a685c7
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1588690
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 84d3f639..f6318257 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -1314,7 +1314,7 @@ struct gk20a {
         struct railgate_stats pstats;
 #endif
         u32 gr_idle_timeout_default;
-        bool timeouts_enabled;
+        bool timeouts_disabled_by_user;
         unsigned int ch_wdt_timeout_ms;
 
         struct nvgpu_mutex poweron_lock;
@@ -1376,7 +1376,8 @@ struct gk20a {
         /* also prevents debug sessions from attaching until released */
         struct nvgpu_mutex dbg_sessions_lock;
         int dbg_powergating_disabled_refcount; /*refcount for pg disable */
-        int dbg_timeout_disabled_refcount; /*refcount for timeout disable */
+        /*refcount for timeout disable */
+        nvgpu_atomic_t timeouts_disabled_refcount;
 
         /* must have dbg_sessions_lock before use */
         struct nvgpu_dbg_reg_op *dbg_regops_tmp_buf;
@@ -1508,9 +1509,14 @@ struct gk20a {
         struct nvgpu_list_node boardobjgrp_head;
 };
 
+static inline bool nvgpu_is_timeouts_enabled(struct gk20a *g)
+{
+        return nvgpu_atomic_read(&g->timeouts_disabled_refcount) == 0;
+}
+
 static inline unsigned long gk20a_get_gr_idle_timeout(struct gk20a *g)
 {
-        return g->timeouts_enabled ?
+        return nvgpu_is_timeouts_enabled(g) ?
                 g->gr_idle_timeout_default : ULONG_MAX;
 }