[v4] usertools/devbind: fix binding for built-in kernel drivers
diff mbox series

Message ID 20201120022233.25498-1-yongxin.liu@windriver.com
State Superseded, archived
Delegated to: Thomas Monjalon
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Series
  • [v4] usertools/devbind: fix binding for built-in kernel drivers
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ci/Intel-compilation fail apply issues
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ci/checkpatch success coding style OK

Commit Message

Yongxin Liu Nov. 20, 2020, 2:22 a.m. UTC
A driver can be loaded as a dynamic module or a built-in module.
In commit 681a67288655 ("usertools: check if module is loaded
before binding"), script only checks modules in /sys/module/.

However, for built-in kernel driver, it only shows up in /sys/module/,
if it has a version or at least one parameter. So add check for
modules in /lib/modules/$(uname -r)/modules.builtin.

Thanks for Anatoly Burakov's advice.

Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>
---

v4:
 - Replace shell call with platform.uname(). Check file existence
   before reading.

v3:
 - Add built-in module list in loaded_modules for checking
   instead of removing error check.

v2:
 - fix git commit description style in commit log
 - fix typo spelling

---
 usertools/dpdk-devbind.py | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

Comments

Burakov, Anatoly Nov. 20, 2020, 10:49 a.m. UTC | #1
On 20-Nov-20 2:22 AM, Yongxin Liu wrote:
> A driver can be loaded as a dynamic module or a built-in module.
> In commit 681a67288655 ("usertools: check if module is loaded
> before binding"), script only checks modules in /sys/module/.
> 
> However, for built-in kernel driver, it only shows up in /sys/module/,
> if it has a version or at least one parameter. So add check for
> modules in /lib/modules/$(uname -r)/modules.builtin.
> 
> Thanks for Anatoly Burakov's advice.
> 
> Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com>
> ---
> 
> v4:
>   - Replace shell call with platform.uname(). Check file existence
>     before reading.
> 
> v3:
>   - Add built-in module list in loaded_modules for checking
>     instead of removing error check.
> 
> v2:
>   - fix git commit description style in commit log
>   - fix typo spelling
> 
> ---
>   usertools/dpdk-devbind.py | 19 ++++++++++++++++++-
>   1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/usertools/dpdk-devbind.py b/usertools/dpdk-devbind.py
> index 99112b7ab..06721709c 100755
> --- a/usertools/dpdk-devbind.py
> +++ b/usertools/dpdk-devbind.py
> @@ -7,6 +7,7 @@
>   import os
>   import getopt
>   import subprocess
> +import platform
>   from glob import glob
>   from os.path import exists, abspath, dirname, basename
>   from os.path import join as path_join
> @@ -181,7 +182,23 @@ def module_is_loaded(module):
>   
>       loaded_modules = sysfs_mods
>   
> -    return module in sysfs_mods
> +    # add built-in modules as loaded
> +    release = platform.uname().release
> +    filename = os.path.join("/lib/modules/", release, "modules.builtin")
> +    if os.path.exists(filename):
> +        try:
> +            f = open(filename, "r")
> +        except:
> +            print("Error: cannot open %s" % filename)
> +            return
> +
> +        builtin_mods = f.readlines()
> +
> +        for mod in builtin_mods:
> +            mod_name = os.path.splitext(os.path.basename(mod))
> +            loaded_modules.append(mod_name[0])
> +

You're not returning a value in error case, this would cause error in 
the caller of this function.

Also, i'd avoid reading the entire file into memory, instead I'd do 
something like this:

try:
     with open(filename) as f:
         loaded_modules += [os.path.splitext(os.path.basename(mod)[0]
                            for mod in f]
except IOError:
     print("Warning: cannot read list of built-in kernel modules")

# continue with regular code

This will be faster, more and readable as well :)

> +    return module in loaded_modules
>   
>   
>   def check_modules():
>
Burakov, Anatoly Nov. 20, 2020, 11:38 a.m. UTC | #2
On 20-Nov-20 2:22 AM, Yongxin Liu wrote:
> A driver can be loaded as a dynamic module or a built-in module.
> In commit 681a67288655 ("usertools: check if module is loaded
> before binding"), script only checks modules in /sys/module/.
> 
> However, for built-in kernel driver, it only shows up in /sys/module/,
> if it has a version or at least one parameter. So add check for
> modules in /lib/modules/$(uname -r)/modules.builtin.
> 
> Thanks for Anatoly Burakov's advice.

Also, no need to add this last line to the commit log :)

Patch
diff mbox series

diff --git a/usertools/dpdk-devbind.py b/usertools/dpdk-devbind.py
index 99112b7ab..06721709c 100755
--- a/usertools/dpdk-devbind.py
+++ b/usertools/dpdk-devbind.py
@@ -7,6 +7,7 @@ 
 import os
 import getopt
 import subprocess
+import platform
 from glob import glob
 from os.path import exists, abspath, dirname, basename
 from os.path import join as path_join
@@ -181,7 +182,23 @@  def module_is_loaded(module):
 
     loaded_modules = sysfs_mods
 
-    return module in sysfs_mods
+    # add built-in modules as loaded
+    release = platform.uname().release
+    filename = os.path.join("/lib/modules/", release, "modules.builtin")
+    if os.path.exists(filename):
+        try:
+            f = open(filename, "r")
+        except:
+            print("Error: cannot open %s" % filename)
+            return
+
+        builtin_mods = f.readlines()
+
+        for mod in builtin_mods:
+            mod_name = os.path.splitext(os.path.basename(mod))
+            loaded_modules.append(mod_name[0])
+
+    return module in loaded_modules
 
 
 def check_modules():