gpu: nvgpu: add QoS notifier for common clk framework

Define specific QoS notifier for common clk framework
and protect it with CONFIG_COMMON_CLK

This new API will first get min/max requirements from
pm_qos and set min/max freq values in devfreq

A call to update_devfreq() will then ensure that
new estimated frequency is clipped appropriately
between min and max values
This also ensures that frequency is set along with
all the book-keeping

Add below platform specific notifier callback and use it
with pm_qos_add_notifier()
int (*qos_notify)()
If qos_notify is set, then only register the callback

We currently support only one qos_id which is treated
as notifier for min frequency
Remove dependency on qos_id, and use appropriate QoS
APIs like pm_qos_read_min/max_bound()

Store devfreq's min/max frequency in struct gk20a
for reference

Bug 1772462

Change-Id: I63d6d17451d19c9d376b67df7db775b38929287d
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1161161
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_gk20a.h b/drivers/gpu/nvgpu/gk20a/platform_gk20a.h
index 66d97915..a753201b 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/platform_gk20a.h
@@ -181,10 +181,11 @@ struct gk20a_platform {
          * this governor to be used in scaling */
         const char *devfreq_governor;
 
-        /* Quality of service id. If this is set, the scaling routines
-         * will register a callback to id. Each time we receive a new value,
-         * the postscale callback gets called.  */
-        int qos_id;
+        /* Quality of service notifier callback. If this is set, the scaling
+         * routines will register a callback to Qos. Each time we receive
+         * a new value, this callback gets called.  */
+        int (*qos_notify)(struct notifier_block *nb,
+                          unsigned long n, void *p);
 
         /* Called as part of debug dump. If the gpu gets hung, this function
          * is responsible for delivering all necessary debug data of other