gpu: nvgpu: suspend/resume support for vGPU

- Added suspend/resume power management callbacks for vGPU
- Added suspend/resume commands for communication between vGPU and
  RM server
- Added suspend/resume message parameters for IVC messages between
  vGPU and RM server

JIRA EVLR-2305
JIRA EVLR-2306

Change-Id: I83a314b4e125a53117d16c5ea72dbc5d8ef96ef7
Signed-off-by: Deepak Bhosale <dbhosale@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1735153
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Nirav Patel <nipatel@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 28 insertions, 6 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/module.c b/drivers/gpu/nvgpu/os/linux/module.c
index af71cc81..4516490b 100644
--- a/drivers/gpu/nvgpu/os/linux/module.c
+++ b/drivers/gpu/nvgpu/os/linux/module.c
@@ -967,9 +967,15 @@ static int gk20a_pm_suspend(struct device *dev)
         int idle_usage_count = 0;
 
         if (!g->power_on) {
+                if (platform->suspend)
+                        ret = platform->suspend(dev);
+                if (ret)
+                        return ret;
+
                 if (!pm_runtime_enabled(dev))
-                        gk20a_pm_railgate(dev);
-                return 0;
+                        ret = gk20a_pm_railgate(dev);
+
+                return ret;
         }
 
         if (nvgpu_atomic_read(&g->usage_count) > idle_usage_count)
@@ -980,25 +986,41 @@ static int gk20a_pm_suspend(struct device *dev)
                 return ret;
 
         if (platform->suspend)
-                platform->suspend(dev);
+                ret = platform->suspend(dev);
+        if (ret)
+                return ret;
 
         g->suspended = true;
 
-        return 0;
+        return ret;
 }
 
 static int gk20a_pm_resume(struct device *dev)
 {
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
         struct gk20a *g = get_gk20a(dev);
         int ret = 0;
 
         if (!g->suspended) {
+                if (platform->resume)
+                        ret = platform->resume(dev);
+                if (ret)
+                        return ret;
+
                 if (!pm_runtime_enabled(dev))
-                        gk20a_pm_unrailgate(dev);
-                return 0;
+                        ret = gk20a_pm_unrailgate(dev);
+
+                return ret;
         }
 
+        if (platform->resume)
+                ret = platform->resume(dev);
+        if (ret)
+                return ret;
+
         ret = gk20a_pm_runtime_resume(dev);
+        if (ret)
+                return ret;
 
         g->suspended = false;