firmware loader: introduce module parameter to customize(v4) fw search path
This patch introduces one module parameter of 'path' in firmware_class to support customizing firmware image search path, so that people can use its own firmware path if the default built-in paths can't meet their demand[1], and the typical usage is passing the below from kernel command parameter when 'firmware_class' is built in kernel: firmware_class.path=$CUSTOMIZED_PATH [1], https://lkml.org/lkml/2012/10/11/337 Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2 changed files with 21 additions and 1 deletions
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@ -22,12 +22,17 @@
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- calls request_firmware(&fw_entry, $FIRMWARE, device)
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- kernel searchs the fimware image with name $FIRMWARE directly
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in the below search path of root filesystem:
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User customized search path by module parameter 'path'[1]
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"/lib/firmware/updates/" UTS_RELEASE,
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"/lib/firmware/updates",
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"/lib/firmware/" UTS_RELEASE,
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"/lib/firmware"
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- If found, goto 7), else goto 2)
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[1], the 'path' is a string parameter which length should be less
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than 256, user should pass 'firmware_class.path=$CUSTOMIZED_PATH'
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if firmware_class is built in kernel(the general situation)
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2), userspace:
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- /sys/class/firmware/xxx/{loading,data} appear.
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- hotplug gets called with a firmware identifier in $FIRMWARE
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@ -269,13 +269,23 @@ static void fw_free_buf(struct firmware_buf *buf)
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}
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/* direct firmware loading support */
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static const char *fw_path[] = {
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static char fw_path_para[256];
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static const char * const fw_path[] = {
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fw_path_para,
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"/lib/firmware/updates/" UTS_RELEASE,
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"/lib/firmware/updates",
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"/lib/firmware/" UTS_RELEASE,
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"/lib/firmware"
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};
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/*
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* Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
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* from kernel command line because firmware_class is generally built in
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* kernel instead of module.
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*/
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module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
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MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path");
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/* Don't inline this: 'struct kstat' is biggish */
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static noinline_for_stack long fw_file_size(struct file *file)
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{
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@ -317,6 +327,11 @@ static bool fw_get_filesystem_firmware(struct firmware_buf *buf)
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for (i = 0; i < ARRAY_SIZE(fw_path); i++) {
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struct file *file;
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/* skip the unset customized path */
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if (!fw_path[i][0])
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continue;
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snprintf(path, PATH_MAX, "%s/%s", fw_path[i], buf->fw_id);
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file = filp_open(path, O_RDONLY, 0);
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