Piecuu/linux-samsung-r9q2
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

drm/msm: Add SYSPROF param (v2)

Browse source 
Add a SYSPROF param for system profiling tools like Mesa's pps-producer
(perfetto) to control behavior related to system-wide performance
counter collection.  In particular, for profiling, one wants to ensure
that GPU context switches do not effect perfcounter state, and might
want to suppress suspend (which would cause counters to lose state).

v2: Swap the order in msm_file_private_set_sysprof() [sboyd] and
    initialize the sysprof_active refcount to one (because the under/
    overflow checking in refcount_t doesn't expect a 0->1 transition)
    meaning that values greater than 1 means sysprof is active.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20220304005317.776110-4-robdclark@gmail.com
This commit is contained in:
Rob Clark 2022-03-03 16:52:16 -08:00
parent f7ddbf5581
commit 90f45c42d7
6 changed files with 81 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
include/uapi/drm/msm_drm.h
View file

@ -81,6 +81,7 @@ struct drm_msm_timespec {
#define MSM_PARAM_PP_PGTABLE 0x08 /* RO: Deprecated, always returns zero */
#define MSM_PARAM_FAULTS 0x09 /* RO */
#define MSM_PARAM_SUSPENDS 0x0a /* RO */
#define MSM_PARAM_SYSPROF 0x0b /* WO: 1 preserves perfcntrs, 2 also disables suspend */
/* For backwards compat. The original support for preemption was based on
* a single ring per priority level so # of priority levels equals the #