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firmware: Allow binary files to be loaded by /boot/loader

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Files loaded "-t firmware" (or module_type="firmware").  They are
registered with the firmware system using the full path to the file.
There's only one firmware per file, and it is the entire file. We do an
extra firmware_get() on any firmware we find here to prevent them from
ever being unloaded (we can't handle that case sanely).

Sponsored by:		Netflix
Reviewed by:		tsoome, jhb
Differential Revision:	https://reviews.freebsd.org/D43522
This commit is contained in:
Warner Losh 2024-02-29 09:36:31 -07:00
parent c7b1e980ae
commit 479905a1ed
1 changed files with 50 additions and 0 deletions
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50
sys/kern/subr_firmware.c
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@ -161,6 +161,19 @@ lookup(const char *name)
LIST_FOREACH(fp, &firmware_table, link) {
if (fp->fw.name != NULL && strcasecmp(name, fp->fw.name) == 0)
break;
/*
* If the name looks like an absolute path, also try to match
* the last part of the string to the requested firmware if it
* matches the trailing components. This allows us to load
* /boot/firmware/abc/bca2233_fw.bin and match it against
* requests for bca2233_fw.bin or abc/bca2233_fw.bin.
*/
if (*fp->fw.name == '/' && strlen(fp->fw.name) > strlen(name)) {
const char *p = fp->fw.name + strlen(fp->fw.name) - strlen(name);
if (p[-1] == '/' && strcasecmp(name, p) == 0)
break;
}
}
return (fp);
}
@ -548,6 +561,42 @@ unloadentry(void *unused1, int unused2)
mtx_unlock(&firmware_mtx);
}
/*
* Find all the binary firmware that was loaded in the boot loader via load -t
* firmware foo. There is only one firmware per file, it's the whole file, and
* there's no meaningful version passed in, so pass 0 for that. If version is
* needed by the consumer (and not just arbitrarily defined), the .ko version
* must be used instead.
*/
static void
firmware_binary_files(void)
{
caddr_t file;
char *name;
const char *type;
const void *addr;
size_t size;
unsigned int version = 0;
const struct firmware *fw;
struct priv_fw *fp;
file = 0;
for (;;) {
file = preload_search_next_name(file);
if (file == 0)
break;
type = (const char *)preload_search_info(file, MODINFO_TYPE);
if (type == NULL || strcmp(type, "firmware") != 0)
continue;
name = preload_search_info(file, MODINFO_NAME);
addr = preload_fetch_addr(file);
size = preload_fetch_size(file);
fw = firmware_register(name, addr, size, version, NULL);
fp = PRIV_FW(fw);
fp->refcnt++; /* Hold an extra reference so we never unload */
}
}
/*
* Module glue.
*/
@ -566,6 +615,7 @@ firmware_modevent(module_t mod, int type, void *unused)
/* NB: use our own loop routine that sets up context */
(void) taskqueue_start_threads(&firmware_tq, 1, PWAIT,
"firmware taskq");
firmware_binary_files();
if (rootvnode != NULL) {
/*
* Root is already mounted so we won't get an event;