Currently debugfs files are created before the driver is even loads.
This gives the opportunity for userspace to open that interface and poke
around before the backing data structures are initialised - with the
possibility of oopsing or worse.
Move the creation of the debugfs files to our registration phase, where
we announce our presence to the world when we are ready, i.e the
sequence changes from
drm_dev_register()
-> drm_minor_register()
-> drm_debugfs_init()
-> i915_debugfs_init()
-> i915_driver_load()
to
drm_dev_register()
-> drm_minor_register()
-> drm_debugfs_init()
-> i915_driver_load()
-> i915_debugfs_register()
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++--
drivers/gpu/drm/i915/i915_dma.c | 2 ++
drivers/gpu/drm/i915/i915_drv.c | 4 ----
drivers/gpu/drm/i915/i915_drv.h | 6 ++++--
4 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index e4f2c55d9697..890d6297dd7d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5499,8 +5499,9 @@ void intel_display_crc_init(struct drm_device *dev)
}
}
-int i915_debugfs_init(struct drm_minor *minor)
+int i915_debugfs_register(struct drm_i915_private *dev_priv)
{
+ struct drm_minor *minor = dev_priv->dev->primary;
int ret, i;
ret = i915_forcewake_create(minor->debugfs_root, minor);
@@ -5526,8 +5527,9 @@ int i915_debugfs_init(struct drm_minor *minor)
minor->debugfs_root, minor);
}
-void i915_debugfs_cleanup(struct drm_minor *minor)
+void i915_debugfs_unregister(struct drm_i915_private *dev_priv)
{
+ struct drm_minor *minor = dev_priv->dev->primary;
int i;
drm_debugfs_remove_files(i915_debugfs_list,
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 4a7a2c08becd..6b36bca585c5 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1360,6 +1360,7 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
if (intel_vgpu_active(dev_priv))
I915_WRITE(vgtif_reg(display_ready), VGT_DRV_DISPLAY_READY);
+ i915_debugfs_register(dev_priv);
i915_setup_sysfs(dev);
intel_modeset_register(dev_priv);
@@ -1399,6 +1400,7 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv)
intel_opregion_unregister(dev_priv);
intel_modeset_unregister(dev_priv);
i915_teardown_sysfs(dev_priv->dev);
+ i915_debugfs_unregister(dev_priv);
i915_gem_shrinker_cleanup(dev_priv);
}
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 872c60608dbd..bbced9022e66 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1753,10 +1753,6 @@ static struct drm_driver driver = {
.postclose = i915_driver_postclose,
.set_busid = drm_pci_set_busid,
-#if defined(CONFIG_DEBUG_FS)
- .debugfs_init = i915_debugfs_init,
- .debugfs_cleanup = i915_debugfs_cleanup,
-#endif
.gem_free_object = i915_gem_free_object,
.gem_vm_ops = &i915_gem_vm_ops,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 005f5913509f..273c8e80ee60 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3543,12 +3543,14 @@ int i915_verify_lists(struct drm_device *dev);
#endif
/* i915_debugfs.c */
-int i915_debugfs_init(struct drm_minor *minor);
-void i915_debugfs_cleanup(struct drm_minor *minor);
#ifdef CONFIG_DEBUG_FS
+int i915_debugfs_register(struct drm_i915_private *dev_priv);
+void i915_debugfs_unregister(struct drm_i915_private *dev_priv);
int i915_debugfs_connector_add(struct drm_connector *connector);
void intel_display_crc_init(struct drm_device *dev);
#else
+static inline int i915_debugfs_register(struct drm_i915_private *) {return 0;}
+static inline void i915_debugfs_unregister(struct drm_i915_private *) {}
static inline int i915_debugfs_connector_add(struct drm_connector *connector)
{ return 0; }
static inline void intel_display_crc_init(struct drm_device *dev) {}
--
2.8.1
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