On 11/12/2019 16:07, Venkata Sandeep Dhanalakota wrote:
We do not require to register the sysctl paths per instance,
so making registration global.
Cc: Sudeep Dutt <sudeep.dutt@xxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_perf.c | 10 ++++++++--
drivers/gpu/drm/i915/i915_perf_types.h | 1 -
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 8d2e37949f46..426d04214a5d 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -387,6 +387,8 @@ struct i915_oa_config_bo {
struct i915_vma *vma;
};
+static struct ctl_table_header *sysctl_header;
+
static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer);
void i915_oa_config_release(struct kref *ref)
@@ -4345,7 +4347,8 @@ void i915_perf_init(struct drm_i915_private *i915)
oa_sample_rate_hard_limit = 1000 *
(RUNTIME_INFO(i915)->cs_timestamp_frequency_khz / 2);
- perf->sysctl_header = register_sysctl_table(dev_root);
+ if (!sysctl_header)
+ sysctl_header = register_sysctl_table(dev_root);
mutex_init(&perf->metrics_lock);
idr_init(&perf->metrics_idr);
@@ -4395,7 +4398,10 @@ void i915_perf_fini(struct drm_i915_private *i915)
idr_for_each(&perf->metrics_idr, destroy_config, perf);
idr_destroy(&perf->metrics_idr);
- unregister_sysctl_table(perf->sysctl_header);
+ if (sysctl_header) {
+ unregister_sysctl_table(sysctl_header);
+ sysctl_header = NULL;
+ }
I am not sure if this could be racy with manual unbind from sysfs. Does
PCI core serialize for us?
Regards,
Tvrtko
memset(&perf->ops, 0, sizeof(perf->ops));
perf->i915 = NULL;
diff --git a/drivers/gpu/drm/i915/i915_perf_types.h b/drivers/gpu/drm/i915/i915_perf_types.h
index 74ddc20a0d37..45e581455f5d 100644
--- a/drivers/gpu/drm/i915/i915_perf_types.h
+++ b/drivers/gpu/drm/i915/i915_perf_types.h
@@ -380,7 +380,6 @@ struct i915_perf {
struct drm_i915_private *i915;
struct kobject *metrics_kobj;
- struct ctl_table_header *sysctl_header;
/*
* Lock associated with adding/modifying/removing OA configs
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