drm/i915/fbc: Avoid full proxy f_ops for FBC debug attributes

Using DEFINE_SIMPLE_ATTRIBUTE macro with the debugfs_create_file()
function adds the overhead of introducing a proxy file operation
functions to wrap the original read/write inside file removal protection
functions. This adds significant overhead in terms of introducing and
managing the proxy factory file operations structure and function
wrapping at runtime.
As a replacement, a combination of DEFINE_DEBUGFS_ATTRIBUTE macro paired
with debugfs_create_file_unsafe() is suggested to be used instead.  The
DEFINE_DEBUGFS_ATTRIBUTE utilises debugfs_file_get() and
debugfs_file_put() wrappers to protect the original read and write
function calls for the debug attributes. There is no need for any
runtime proxy file operations to be managed by the debugfs core.
Following coccicheck make command helped identify this change:

make coccicheck M=drivers/gpu/drm/i915/ MODE=patch COCCI=./scripts/coccinelle/api/debugfs/debugfs_simple_attr.cocci

Signed-off-by: Deepak R Varma <drv@mailo.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5d26e924ec8dea21925c77fa79a2bf2a34cef705.1673451705.git.drv@mailo.com

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 5e69d3c11d21cb5ed9d2b0fe72f3cdf3767569ba..c508dcf415b413a0025eba33573bf045315957c5 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -1807,10 +1807,10 @@ static int intel_fbc_debugfs_false_color_set(void *data, u64 val)
        return 0;
 }
 
-DEFINE_SIMPLE_ATTRIBUTE(intel_fbc_debugfs_false_color_fops,
-                       intel_fbc_debugfs_false_color_get,
-                       intel_fbc_debugfs_false_color_set,
-                       "%llu\n");
+DEFINE_DEBUGFS_ATTRIBUTE(intel_fbc_debugfs_false_color_fops,
+                        intel_fbc_debugfs_false_color_get,
+                        intel_fbc_debugfs_false_color_set,
+                        "%llu\n");
 
 static void intel_fbc_debugfs_add(struct intel_fbc *fbc,
                                  struct dentry *parent)
@@ -1819,8 +1819,8 @@ static void intel_fbc_debugfs_add(struct intel_fbc *fbc,
                            fbc, &intel_fbc_debugfs_status_fops);
 
        if (fbc->funcs->set_false_color)
-               debugfs_create_file("i915_fbc_false_color", 0644, parent,
-                                   fbc, &intel_fbc_debugfs_false_color_fops);
+               debugfs_create_file_unsafe("i915_fbc_false_color", 0644, parent,
+                                          fbc, &intel_fbc_debugfs_false_color_fops);
 }
 
 void intel_fbc_crtc_debugfs_add(struct intel_crtc *crtc)