Quoting Sanjay Singh Rawat (2013-01-24 08:01:33)
Signed-off-by: Sanjay Singh Rawat sanjay.rawat@linaro.com
Sanjay,
Have you seen the patch to dump the CCF tree from a single sysfs file, in JSON format?
http://git.linaro.org/gitweb?p=people/mturquette/linux.git%3Ba=commitdiff%3B...
This is much nicer than parsing a directory structure. It is faster and most importantly the data is atomic. A lock is held across the clock framework while the data is accessed so you don't have to worry about data changing in between reads like you do with the directory method.
Regards, Mike
clocks.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 56 insertions(+), 13 deletions(-)
diff --git a/clocks.c b/clocks.c index 2611a0d..95acf57 100644 --- a/clocks.c +++ b/clocks.c @@ -42,9 +42,19 @@ struct clock_info { int usecount; bool expanded; char *prefix;
int preparecount;int enablecount;int notifiercount;} *clocks_info; +enum clock_fw_type{
CCF, /* common clock framework */OCF, /* old clock framework */MAX,+};
static struct tree *clock_tree = NULL; +static int clock_fw; static int locate_debugfs(char *clk_path) { @@ -144,9 +154,18 @@ static inline int read_clock_cb(struct tree *t, void *data) { struct clock_info *clk = t->private;
file_read_value(t->path, "flags", "%x", &clk->flags);file_read_value(t->path, "rate", "%d", &clk->rate);file_read_value(t->path, "usecount", "%d", &clk->usecount);
if(clock_fw == CCF) {file_read_value(t->path, "clk_flags", "%x", &clk->flags);file_read_value(t->path, "clk_rate", "%d", &clk->rate);file_read_value(t->path, "clk_prepare_count", "%d", &clk->preparecount);file_read_value(t->path, "clk_enable_count", "%d", &clk->enablecount);file_read_value(t->path, "clk_notifier_count", "%d", &clk->notifiercount);}else {file_read_value(t->path, "flags", "%x", &clk->flags);file_read_value(t->path, "rate", "%d", &clk->rate);file_read_value(t->path, "usecount", "%d", &clk->usecount);}return 0; } @@ -206,9 +225,17 @@ static char *clock_line(struct tree *t) if (asprintf(&clkrate, "%d%s", rate, clkunit) < 0) goto free_clkname;
if (asprintf(&clkline, "%-55s 0x%-16x %-12s %-9d %-8d", clkname,clk->flags, clkrate, clk->usecount, t->nrchild) < 0)goto free_clkrate;
if(clock_fw == CCF) {if (asprintf(&clkline, "%-35s 0x%-8x %-12s %-10d %-11d %-15d %-14d %-10d",clkname, clk->flags, clkrate, clk->usecount, t->nrchild,clk->preparecount, clk->enablecount, clk->notifiercount) < 0)goto free_clkrate;}else {if (asprintf(&clkline, "%-55s 0x%-16x %-12s %-9d %-8d",clkname, clk->flags, clkrate, clk->usecount, t->nrchild) < 0)goto free_clkrate;}free_clkrate: free(clkrate); @@ -259,9 +286,17 @@ static int clock_print_header(void) char *buf; int ret;
if (asprintf(&buf, "%-55s %-16s %-12s %-9s %-8s",
if(clock_fw == CCF) {if (asprintf(&buf, "%-35s %-10s %-12s %-10s %-11s %-15s %-14s %-14s","Name", "Flags", "Rate", "Usecount", "Children", "Prepare_Count","Enable_Count", "Notifier_Count") < 0)return -1;}else {if (asprintf(&buf, "%-55s %-16s %-12s %-9s %-8s", "Name", "Flags", "Rate", "Usecount", "Children") < 0) return -1;}ret = display_column_name(buf); @@ -384,17 +419,25 @@ static struct display_ops clock_ops = { */ int clock_init(void) {
char clk_dir_path[PATH_MAX];
char clk_dir_path[MAX+1][PATH_MAX];
if (locate_debugfs(clk_dir_path))
if (locate_debugfs(clk_dir_path[CCF]) || locate_debugfs(clk_dir_path[OCF])) return -1;
sprintf(clk_dir_path, "%s/clock", clk_dir_path);if (access(clk_dir_path, F_OK))
sprintf(clk_dir_path[CCF], "%s/clk", clk_dir_path[CCF]);sprintf(clk_dir_path[OCF], "%s/clock", clk_dir_path[OCF]);if (!access(clk_dir_path[CCF], F_OK)) {clock_fw = CCF;strcpy(clk_dir_path[MAX],clk_dir_path[CCF]);}else if(!access(clk_dir_path[OCF], F_OK)) {clock_fw = OCF;strcpy(clk_dir_path[MAX],clk_dir_path[OCF]);}else return -1;
clock_tree = tree_load(clk_dir_path, NULL, false);
clock_tree = tree_load(clk_dir_path[MAX], NULL, false); if (!clock_tree) return -1;1.7.9.5
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