OrgACRN
/
acrn-kernel
mirror of https://github.com/projectacrn/acrn-kernel.git
1
0
Fork 0
Code Issues Releases Wiki Activity

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
This commit is contained in:
Deepak R Varma 2023-01-11 21:21:59 +05:30 committed by Junxiao Chang
parent 60acd410d7
commit 171975432e
1 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/i915/display/intel_fbc.c
View File

@ -1807,7 +1807,7 @@ static int intel_fbc_debugfs_false_color_set(void *data, u64 val)
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(intel_fbc_debugfs_false_color_fops,
DEFINE_DEBUGFS_ATTRIBUTE(intel_fbc_debugfs_false_color_fops,
intel_fbc_debugfs_false_color_get,
intel_fbc_debugfs_false_color_set,
"%llu\n");
@ -1819,7 +1819,7 @@ 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,
debugfs_create_file_unsafe("i915_fbc_false_color", 0644, parent,
fbc, &intel_fbc_debugfs_false_color_fops);
}