[Intel-gfx] [PATCH 1/2] drm/i915/perf: Register sysctl path globally

[Venkata Sandeep Dhanalakota]

We do not require to register the sysctl paths per instance,
so making registration global.

v2: make sysctl path register and unregister function driver
    specific (Tvrtko and Lucas).

Cc: Sudeep Dutt <sudeep.d...@intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nik...@intel.com>
Signed-off-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalak...@intel.com>
---
 drivers/gpu/drm/i915/i915_pci.c        |  6 ++++++
 drivers/gpu/drm/i915/i915_perf.c       | 19 ++++++++++++++++---
 drivers/gpu/drm/i915/i915_perf.h       |  2 ++
 drivers/gpu/drm/i915/i915_perf_types.h |  1 -
 4 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index bba6b50e6beb..c5a2bb5e87fe 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -30,6 +30,7 @@
 #include "display/intel_fbdev.h"
 
 #include "i915_drv.h"
+#include "i915_perf.h"
 #include "i915_globals.h"
 #include "i915_selftest.h"
 
@@ -1051,6 +1052,10 @@ static int __init i915_init(void)
                return 0;
        }
 
+       err = i915_perf_sysctl_register();
+       if (err)
+               return err;
+
        return pci_register_driver(&i915_pci_driver);
 }
 
@@ -1059,6 +1064,7 @@ static void __exit i915_exit(void)
        if (!i915_pci_driver.driver.owner)
                return;
 
+       i915_perf_sysctl_unregister();
        pci_unregister_driver(&i915_pci_driver);
        i915_globals_exit();
 }
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 8d2e37949f46..f039beed1771 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 +4347,6 @@ 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);
 
                mutex_init(&perf->metrics_lock);
                idr_init(&perf->metrics_idr);
@@ -4381,6 +4382,20 @@ static int destroy_config(int id, void *p, void *data)
        return 0;
 }
 
+int i915_perf_sysctl_register(void)
+{
+       sysctl_header = register_sysctl_table(dev_root);
+       if (!sysctl_header)
+               return -ENOMEM;
+
+       return 0;
+}
+
+void i915_perf_sysctl_unregister(void)
+{
+       unregister_sysctl_table(sysctl_header);
+}
+
 /**
  * i915_perf_fini - Counter part to i915_perf_init()
  * @i915: i915 device instance
@@ -4395,8 +4410,6 @@ 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);
-
        memset(&perf->ops, 0, sizeof(perf->ops));
        perf->i915 = NULL;
 }
diff --git a/drivers/gpu/drm/i915/i915_perf.h b/drivers/gpu/drm/i915/i915_perf.h
index 4ceebce72060..1d1329e5af3a 100644
--- a/drivers/gpu/drm/i915/i915_perf.h
+++ b/drivers/gpu/drm/i915/i915_perf.h
@@ -23,6 +23,8 @@ void i915_perf_fini(struct drm_i915_private *i915);
 void i915_perf_register(struct drm_i915_private *i915);
 void i915_perf_unregister(struct drm_i915_private *i915);
 int i915_perf_ioctl_version(void);
+int i915_perf_sysctl_register(void);
+void i915_perf_sysctl_unregister(void);
 
 int i915_perf_open_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file);
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
-- 
2.21.0.5.gaeb582a983

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