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lib: sbi: Improve get_feature_str() implementation and usage

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We do following improvements for get_feature_str():
1. We should return "none" from get_feature_str() no features
   available instead of sbi_boot_prints() explicitly handling
   failure.
2. We don't need to return failure (just like misa_xlen())
   because we are returning "none" for no features and we are
   truncating output when space is not available.
3. Based on 1 and 2, the sbi_boot_prints() can be further
   simplified.
4. No need for two char[] in sbi_boot_prints()

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-05-10 11:36:14 +05:30
committed by Anup Patel
parent 28b4052849
commit 49841832b8
5 changed files with 34 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/sbi/sbi_hart.h
View File

@@ -43,7 +43,7 @@ int sbi_hart_pmp_check_addr(struct sbi_scratch *scratch, unsigned long daddr,
unsigned long attr);
bool sbi_hart_has_feature(u32 hartid, unsigned long feature);
unsigned long sbi_hart_get_features(u32 hartid);
int sbi_hart_get_features_str(u32 hartid, char *features_str, int nfstr);
void sbi_hart_get_features_str(u32 hartid, char *features_str, int nfstr);
void __attribute__((noreturn)) sbi_hart_hang(void);

5
include/sbi/sbi_platform.h
View File

@@ -244,10 +244,9 @@ u32 sbi_platform_hart_index(const struct sbi_platform *plat, u32 hartid);
* updated
* @param nfstr length of the features_str. The feature string will be truncated
* if nfstr is not long enough.
* @return the features value currently set for the given platform
*/
int sbi_platform_get_features_str(const struct sbi_platform *plat,
char *features_str, int nfstr);
void sbi_platform_get_features_str(const struct sbi_platform *plat,
char *features_str, int nfstr);
/**
* Get name of the platform

18
lib/sbi/sbi_hart.c
View File

@@ -270,18 +270,20 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
* updated
* @param nfstr length of the features_str. The feature string will be truncated
* if nfstr is not long enough.
* @return the features value currently set for the given platform
*/
int sbi_hart_get_features_str(u32 hartid, char *features_str, int nfstr)
void sbi_hart_get_features_str(u32 hartid, char *features_str, int nfstr)
{
unsigned long features, feat = 1UL;
char *temp;
int offset = 0;
if (!features_str || !nfstr)
return SBI_EINVAL;
if (!features_str || nfstr <= 0)
return;
sbi_memset(features_str, 0, nfstr);
features = sbi_hart_get_features(hartid);
if (!features)
goto done;
do {
if (features & feat) {
@@ -295,9 +297,11 @@ int sbi_hart_get_features_str(u32 hartid, char *features_str, int nfstr)
feat = feat << 1;
} while (feat <= SBI_HART_HAS_LAST_FEATURE);
features_str[offset - 1] = '\0';
return 0;
done:
if (offset)
features_str[offset - 1] = '\0';
else
sbi_strncpy(features_str, "none", nfstr);
}
static void sbi_hart_set_feature(u32 hartid, unsigned long feature)

27
lib/sbi/sbi_init.c
View File

@@ -35,10 +35,8 @@
static void sbi_boot_prints(struct sbi_scratch *scratch, u32 hartid)
{
int xlen, ret;
char str[64];
int max_fstr_len = 128;
char features[128];
int xlen;
char str[128];
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
#ifdef OPENSBI_VERSION_GIT
@@ -56,35 +54,26 @@ static void sbi_boot_prints(struct sbi_scratch *scratch, u32 hartid)
sbi_printf("Error %d getting MISA XLEN\n", xlen);
sbi_hart_hang();
}
misa_string(xlen, str, sizeof(str));
/* Platform details */
sbi_printf("Platform Name : %s\n", sbi_platform_name(plat));
sbi_printf("Platform HART Count : %u\n",
sbi_platform_hart_count(plat));
sbi_memset(features, 0, max_fstr_len);
ret = sbi_platform_get_features_str(plat, features, max_fstr_len);
if (!ret)
sbi_printf("Platform Features : %s\n", features);
else
sbi_printf("Platform Features : %s\n", "none");
sbi_platform_get_features_str(plat, str, sizeof(str));
sbi_printf("Platform Features : %s\n", str);
/* Boot HART details */
sbi_printf("Boot HART ID : %u\n", hartid);
misa_string(xlen, str, sizeof(str));
sbi_printf("Boot HART ISA : %s\n", str);
sbi_memset(features, 0, max_fstr_len);
ret = sbi_hart_get_features_str(hartid, features, max_fstr_len);
if (!ret)
sbi_printf("BOOT HART Features : %s\n", features);
else
sbi_printf("BOOT HART Features : %s\n", "none");
sbi_hart_get_features_str(hartid, str, sizeof(str));
sbi_printf("BOOT HART Features : %s\n", str);
/* Firmware details */
sbi_printf("Firmware Base : 0x%lx\n", scratch->fw_start);
sbi_printf("Firmware Size : %d KB\n",
(u32)(scratch->fw_size / 1024));
/* Generic details */
sbi_printf("Runtime SBI Version : %d.%d\n",
sbi_ecall_version_major(), sbi_ecall_version_minor());

38
lib/sbi/sbi_platform.c
View File

@@ -38,27 +38,20 @@ static inline char *sbi_platform_feature_id2string(unsigned long feature)
return fstr;
}
/**
* Get the platform features in string format
*
* @param plat pointer to struct sbi_platform
* @param features_str pointer to a char array where the features string will be
* updated
* @param nfstr length of the features_str. The feature string will be truncated
* if nfstr is not long enough.
* @return the features value currently set for the given platform
*/
int sbi_platform_get_features_str(const struct sbi_platform *plat,
char *features_str, int nfstr)
void sbi_platform_get_features_str(const struct sbi_platform *plat,
char *features_str, int nfstr)
{
unsigned long features, feat = 1UL;
char *temp;
int offset = 0;
if (!plat || !features_str || !nfstr)
return SBI_EINVAL;
return;
sbi_memset(features_str, 0, nfstr);
features = sbi_platform_get_features(plat);
if (!features)
goto done;
do {
if (features & feat) {
@@ -72,21 +65,14 @@ int sbi_platform_get_features_str(const struct sbi_platform *plat,
feat = feat << 1;
} while (feat <= SBI_PLATFORM_HAS_LAST_FEATURE);
features_str[offset - 1] = '\0';
return 0;
done:
if (offset)
features_str[offset - 1] = '\0';
else
sbi_strncpy(features_str, "none", nfstr);
}
/**
* Get HART index for the given HART
*
* @param plat pointer to struct sbi_platform
* @param hartid HART ID
*
* @return 0 <= value < hart_count for valid HART otherwise -1U
*/
u32 sbi_platform_hart_index(const struct sbi_platform *plat,
u32 hartid)
u32 sbi_platform_hart_index(const struct sbi_platform *plat, u32 hartid)
{
u32 i;