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selftests/powerpc: Add {read,write}_{long,ulong}

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Add helper functions to read and write (unsigned) long values directly
from/to files. One of the kernel interfaces uses hex strings, so we need
to allow passing a base too.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20230203003947.38033-5-bgray@linux.ibm.com
This commit is contained in:
Benjamin Gray 2023-02-03 11:39:46 +11:00 committed by Michael Ellerman
parent d1bc05b7bf
commit 5c20de5788
5 changed files with 95 additions and 22 deletions
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9
tools/testing/selftests/powerpc/dscr/dscr.h
View File

@ -65,26 +65,21 @@ inline void set_dscr_usr(unsigned long val)
unsigned long get_default_dscr(void)
{
int err;
char buf[16] = {0};
unsigned long val;
err = read_file(DSCR_DEFAULT, buf, sizeof(buf) - 1, NULL);
err = read_ulong(DSCR_DEFAULT, &val, 16);
if (err) {
perror("read() failed");
exit(1);
}
sscanf(buf, "%lx", &val);
return val;
}
void set_default_dscr(unsigned long val)
{
int err;
char buf[16];
sprintf(buf, "%lx\n", val);
err = write_file(DSCR_DEFAULT, buf, strlen(buf));
err = write_ulong(DSCR_DEFAULT, val, 16);
if (err) {
perror("write() failed");
exit(1);

14
tools/testing/selftests/powerpc/dscr/dscr_sysfs_test.c
View File

@ -12,16 +12,16 @@
static int check_cpu_dscr_default(char *file, unsigned long val)
{
char buf[10] = {0};
int rc;
unsigned long cpu_dscr;
int err;
rc = read_file(file, buf, sizeof(buf) - 1, NULL);
if (rc)
return rc;
err = read_ulong(file, &cpu_dscr, 16);
if (err)
return err;
if (strtol(buf, NULL, 16) != val) {
if (cpu_dscr != val) {
printf("DSCR match failed: %ld (system) %ld (cpu)\n",
val, strtol(buf, NULL, 16));
val, cpu_dscr);
return 1;
}
return 0;

4
tools/testing/selftests/powerpc/include/utils.h
View File

@ -42,6 +42,10 @@ int parse_ulong(const char *buffer, size_t count, unsigned long *result, int bas
int read_file(const char *path, char *buf, size_t count, size_t *len);
int write_file(const char *path, const char *buf, size_t count);
int read_long(const char *path, long *result, int base);
int write_long(const char *path, long result, int base);
int read_ulong(const char *path, unsigned long *result, int base);
int write_ulong(const char *path, unsigned long result, int base);
int read_debugfs_file(const char *debugfs_file, char *buf, size_t count);
int write_debugfs_file(const char *debugfs_file, const char *buf, size_t count);
int read_debugfs_int(const char *debugfs_file, int *result);

9
tools/testing/selftests/powerpc/pmu/lib.c
View File

@ -192,15 +192,8 @@ bool require_paranoia_below(int level)
{
int err;
long current;
char buf[16] = {0};
err = read_file(PARANOID_PATH, buf, sizeof(buf) - 1, NULL);
if (err) {
printf("Couldn't read " PARANOID_PATH "?\n");
return false;
}
err = parse_long(buf, sizeof(buf), &current, 10);
err = read_long(PARANOID_PATH, &current, 10);
if (err) {
printf("Couldn't parse " PARANOID_PATH "?\n");
return false;

81
tools/testing/selftests/powerpc/utils.c
View File

@ -245,6 +245,87 @@ int parse_ulong(const char *buffer, size_t count, unsigned long *result, int bas
return err;
}
int read_long(const char *path, long *result, int base)
{
int err;
char buffer[32] = {0};
err = read_file(path, buffer, sizeof(buffer) - 1, NULL);
if (err)
return err;
return parse_long(buffer, sizeof(buffer), result, base);
}
int read_ulong(const char *path, unsigned long *result, int base)
{
int err;
char buffer[32] = {0};
err = read_file(path, buffer, sizeof(buffer) - 1, NULL);
if (err)
return err;
return parse_ulong(buffer, sizeof(buffer), result, base);
}
int write_long(const char *path, long result, int base)
{
int err;
int len;
char buffer[32];
/* Decimal only for now: no format specifier for signed hex values */
if (base != 10) {
err = -EINVAL;
goto out;
}
len = snprintf(buffer, sizeof(buffer), "%ld", result);
if (len < 0 || len >= sizeof(buffer)) {
err = -EOVERFLOW;
goto out;
}
err = write_file(path, buffer, len);
out:
errno = -err;
return err;
}
int write_ulong(const char *path, unsigned long result, int base)
{
int err;
int len;
char buffer[32];
char *fmt;
switch (base) {
case 10:
fmt = "%lu";
break;
case 16:
fmt = "%lx";
break;
default:
err = -EINVAL;
goto out;
}
len = snprintf(buffer, sizeof(buffer), fmt, result);
if (len < 0 || len >= sizeof(buffer)) {
err = -errno;
goto out;
}
err = write_file(path, buffer, len);
out:
errno = -err;
return err;
}
void *find_auxv_entry(int type, char *auxv)
{
ElfW(auxv_t) *p;