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gpu: nvgpu: register pm_qos min & max frequency notifiers

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nvpmodel updates the devfreq frequency limits as per power requirements
for specific chip. Clock arbiter ignored these limits and set clock
to maximum supported frequency which may lead to leaking power and
over heating.

Add support to get the devfreq limits by registering PM_QOS notifiers.
Note that with this patch we enable CONFIG_GK20A_PM_QOS when PM_DEVFREQ
is enabled. So it will be enabled for all supported kernels (4.9, 4.14
kernels continue to support this. For 5.10+ kernels notifiers added in
this patch will be used. Thermal framework related notifiers for kernels
after 4.14 will not be registered as those use downstream interfaces
that are not available.)

We maintain devfreq min/max limits in the scale profile and update those
in the notifier calls. We use these limits to clamp the frequency in the
clock arbiter.

Bug 3852824

Change-Id: I734a9fb080fee1a91e9b5da071b662dbd9a18682
Signed-off-by: Sagar Kamble <skamble@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2822686
Tested-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
Reviewed-by: Rajesh Devaraj <rdevaraj@nvidia.com>
Reviewed-by: Dinesh T <dt@nvidia.com>
Reviewed-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
Reviewed-by: Ankur Kishore <ankkishore@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Sagar Kamble
2022-12-05 21:42:12 +05:30
committed by mobile promotions
parent a432d2adf3
commit eacaf8cec2
11 changed files with 267 additions and 19 deletions
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11
drivers/gpu/nvgpu/os/linux/platform_gk20a.h
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@@ -17,6 +17,7 @@
#define _GK20A_PLATFORM_H_
#include <linux/device.h>
#include <linux/version.h>
#include <nvgpu/lock.h>
#include <nvgpu/gk20a.h>
@@ -264,11 +265,21 @@ struct gk20a_platform {
* this governor to be used in scaling */
const char *devfreq_governor;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0)
/* Quality of service notifier callback for min frequency limit. */
int (*qos_min_notify)(struct notifier_block *nb,
unsigned long n, void *p);
/* Quality of service notifier callback for max frequency limit. */
int (*qos_max_notify)(struct notifier_block *nb,
unsigned long n, void *p);
#else
/* 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);
#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(5, 10, 0) */
/* Called as part of debug dump. If the gpu gets hung, this function
* is responsible for delivering all necessary debug data of other