gpu: nvgpu: vgpu: add devfreq support

Add devfreq governor support in order to allow frequency scaling
in virtualization config. GPU clock frequency operations are
re-directed to the server over RPC.

Bug 200237433

Change-Id: I1c8e565a4fff36d3456dc72ebb20795b7822650e
Signed-off-by: Sachit Kadle <skadle@nvidia.com>
Reviewed-on: http://git-master/r/1295542
(cherry picked from commit d5c956fc06697eda3829c67cb22987e538213b29)
Reviewed-on: http://git-master/r/1280968
(cherry picked from commit 25e2b3cf7cb5559a6849c0024d42c157564a9be2)
Reviewed-on: http://git-master/r/1321835
(cherry picked from commit f871b52fd3f553d6b6375a3c848fbca272ed8e29)
Reviewed-on: http://git-master/r/1313468
Tested-by: Aparna Das <aparnad@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Richard Zhao <rizhao@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 37 insertions, 12 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/vgpu.c b/drivers/gpu/nvgpu/vgpu/vgpu.c
index 2b1c93dd..e8a778f5 100644
--- a/drivers/gpu/nvgpu/vgpu/vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/vgpu.c
@@ -26,6 +26,7 @@
 
 #include "vgpu/vgpu.h"
 #include "vgpu/fecs_trace_vgpu.h"
+#include "vgpu/clk_vgpu.h"
 #include "gk20a/hal_gk20a.h"
 #include "gk20a/ctxsw_trace_gk20a.h"
 #include "gk20a/tsg_gk20a.h"
@@ -538,18 +539,22 @@ static int vgpu_qos_notify(struct notifier_block *nb,
 static int vgpu_pm_qos_init(struct device *dev)
 {
         struct gk20a *g = get_gk20a(dev);
-        struct gk20a_scale_profile *profile;
+        struct gk20a_scale_profile *profile = g->scale_profile;
 
-        profile = nvgpu_kzalloc(g, sizeof(*profile));
-        if (!profile)
-                return -ENOMEM;
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ)) {
+                if (!profile)
+                        return -EINVAL;
+        } else {
+                profile = nvgpu_kzalloc(g, sizeof(*profile));
+                if (!profile)
+                        return -ENOMEM;
+                g->scale_profile = profile;
+        }
 
         profile->dev = dev;
         profile->qos_notify_block.notifier_call = vgpu_qos_notify;
-        g->scale_profile = profile;
         pm_qos_add_max_notifier(PM_QOS_GPU_FREQ_BOUNDS,
                                 &profile->qos_notify_block);
-
         return 0;
 }
 
@@ -565,11 +570,31 @@ static void vgpu_pm_qos_remove(struct device *dev)
 
 static int vgpu_pm_init(struct device *dev)
 {
+        struct gk20a *g = get_gk20a(dev);
+        unsigned long *freqs;
+        int num_freqs;
         int err = 0;
 
         gk20a_dbg_fn("");
 
         __pm_runtime_disable(dev, false);
+
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ))
+                gk20a_scale_init(dev);
+
+        if (g->devfreq) {
+                /* set min/max frequency based on frequency table */
+                err = vgpu_clk_get_freqs(dev, &freqs, &num_freqs);
+                if (err)
+                        return err;
+
+                if (num_freqs < 1)
+                        return -EINVAL;
+
+                g->devfreq->min_freq = freqs[0];
+                g->devfreq->max_freq = freqs[num_freqs - 1];
+        }
+
         err = vgpu_pm_qos_init(dev);
         if (err)
                 return err;
@@ -675,12 +700,6 @@ int vgpu_probe(struct platform_device *pdev)
                 return err;
         }
 
-        err = vgpu_pm_init(dev);
-        if (err) {
-                dev_err(dev, "pm init failed");
-                return err;
-        }
-
         if (platform->late_probe) {
                 err = platform->late_probe(dev);
                 if (err) {
@@ -708,6 +727,12 @@ int vgpu_probe(struct platform_device *pdev)
                 return err;
         }
 
+        err = vgpu_pm_init(dev);
+        if (err) {
+                dev_err(dev, "pm init failed");
+                return err;
+        }
+
         err = nvgpu_thread_create(&priv->intr_handler, gk20a,
                         vgpu_intr_thread, "gk20a");
         if (err)