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powerpc/pseries: Allow firmware features to match partial strings

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This allows firmware_features_table names to add a '*' at the end so that only
partial strings are matched.

When a '*' is added, only upto the '*' is matched when setting firmware feature
bits.

This is useful for the matching best energy feature.

Signed-off-by: Michael Neuling <mikey@neuling.org>
cc: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
cc: Linux PPC dev <linuxppc-dev@ozlabs.org>
Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling 2012-11-06 14:49:15 +00:00 committed by Benjamin Herrenschmidt
parent 1e18c17adf
commit 2f1d4ea7bc
1 changed files with 18 additions and 2 deletions
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20
arch/powerpc/platforms/pseries/firmware.c
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@ -33,6 +33,11 @@ typedef struct {
char * name;
} firmware_feature_t;
/*
* The names in this table match names in rtas/ibm,hypertas-functions. If the
* entry ends in a '*', only upto the '*' is matched. Otherwise the entire
* string must match.
*/
static __initdata firmware_feature_t
firmware_features_table[FIRMWARE_MAX_FEATURES] = {
{FW_FEATURE_PFT, "hcall-pft"},
@ -72,9 +77,20 @@ void __init fw_feature_init(const char *hypertas, unsigned long len)
for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
for (i = 0; i < FIRMWARE_MAX_FEATURES; i++) {
const char *name = firmware_features_table[i].name;
size_t size;
/* check value against table of strings */
if (!firmware_features_table[i].name ||
strcmp(firmware_features_table[i].name, s))
if (!name)
continue;
/*
* If there is a '*' at the end of name, only check
* upto there
*/
size = strlen(name);
if (size && name[size - 1] == '*') {
if (strncmp(name, s, size - 1))
continue;
} else if (strcmp(name, s))
continue;
/* we have a match */