Merge "clk: Add support to allow client to print all enabled clocks"

This commit is contained in:
Linux Build Service Account 2016-11-18 01:54:42 -08:00 committed by Gerrit - the friendly Code Review server
commit 5d4d0ab7a7
3 changed files with 368 additions and 4 deletions

View file

@ -2267,6 +2267,7 @@ EXPORT_SYMBOL_GPL(clk_set_flags);
static struct dentry *rootdir;
static int inited = 0;
static u32 debug_suspend;
static DEFINE_MUTEX(clk_debug_lock);
static HLIST_HEAD(clk_debug_list);
@ -2409,6 +2410,309 @@ static const struct file_operations clk_dump_fops = {
.release = single_release,
};
static int clock_debug_rate_set(void *data, u64 val)
{
struct clk_core *core = data;
int ret;
ret = clk_set_rate(core->hw->clk, val);
if (ret)
pr_err("clk_set_rate(%lu) failed (%d)\n",
(unsigned long)val, ret);
return ret;
}
static int clock_debug_rate_get(void *data, u64 *val)
{
struct clk_core *core = data;
*val = core->hw->core->rate;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_rate_fops, clock_debug_rate_get,
clock_debug_rate_set, "%llu\n");
static ssize_t clock_parent_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char name[256] = {0};
struct clk_core *core = filp->private_data;
struct clk_core *p = core->hw->core->parent;
snprintf(name, sizeof(name), "%s\n", p ? p->name : "None\n");
return simple_read_from_buffer(ubuf, cnt, ppos, name, strlen(name));
}
static const struct file_operations clock_parent_fops = {
.open = simple_open,
.read = clock_parent_read,
};
static int clock_debug_enable_set(void *data, u64 val)
{
struct clk_core *core = data;
int rc = 0;
if (val)
rc = clk_prepare_enable(core->hw->clk);
else
clk_disable_unprepare(core->hw->clk);
return rc;
}
static int clock_debug_enable_get(void *data, u64 *val)
{
struct clk_core *core = data;
int enabled = 0;
enabled = core->enable_count;
*val = enabled;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(clock_enable_fops, clock_debug_enable_get,
clock_debug_enable_set, "%lld\n");
#define clock_debug_output(m, c, fmt, ...) \
do { \
if (m) \
seq_printf(m, fmt, ##__VA_ARGS__); \
else if (c) \
pr_cont(fmt, ##__VA_ARGS__); \
else \
pr_info(fmt, ##__VA_ARGS__); \
} while (0)
int clock_debug_print_clock(struct clk_core *c, struct seq_file *s)
{
char *start = "";
struct clk *clk;
if (!c || !c->prepare_count)
return 0;
clk = c->hw->clk;
clock_debug_output(s, 0, "\t");
do {
if (clk->core->vdd_class)
clock_debug_output(s, 1, "%s%s:%u:%u [%ld, %d]", start,
clk->core->name,
clk->core->prepare_count,
clk->core->enable_count,
clk->core->rate,
clk_find_vdd_level(clk->core, clk->core->rate));
else
clock_debug_output(s, 1, "%s%s:%u:%u [%ld]", start,
clk->core->name,
clk->core->prepare_count,
clk->core->enable_count,
clk->core->rate);
start = " -> ";
} while ((clk = clk_get_parent(clk)));
clock_debug_output(s, 1, "\n");
return 1;
}
/*
* clock_debug_print_enabled_clocks() - Print names of enabled clocks
*/
static void clock_debug_print_enabled_clocks(struct seq_file *s)
{
struct clk_core *core;
int cnt = 0;
clock_debug_output(s, 0, "Enabled clocks:\n");
mutex_lock(&clk_debug_lock);
hlist_for_each_entry(core, &clk_debug_list, debug_node)
cnt += clock_debug_print_clock(core, s);
mutex_unlock(&clk_debug_lock);
if (cnt)
clock_debug_output(s, 0, "Enabled clock count: %d\n", cnt);
else
clock_debug_output(s, 0, "No clocks enabled.\n");
}
static int enabled_clocks_show(struct seq_file *s, void *unused)
{
clock_debug_print_enabled_clocks(s);
return 0;
}
static int enabled_clocks_open(struct inode *inode, struct file *file)
{
return single_open(file, enabled_clocks_show, inode->i_private);
}
static const struct file_operations clk_enabled_list_fops = {
.open = enabled_clocks_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static void clk_debug_print_hw(struct clk_core *clk, struct seq_file *f)
{
if (IS_ERR_OR_NULL(clk))
return;
clk_debug_print_hw(clk->parent, f);
clock_debug_output(f, false, "%s\n", clk->name);
if (!clk->ops->list_registers)
return;
clk->ops->list_registers(f, clk->hw);
}
static int print_hw_show(struct seq_file *m, void *unused)
{
struct clk_core *c = m->private;
clk_debug_print_hw(c, m);
return 0;
}
static int print_hw_open(struct inode *inode, struct file *file)
{
return single_open(file, print_hw_show, inode->i_private);
}
static const struct file_operations clock_print_hw_fops = {
.open = print_hw_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int list_rates_show(struct seq_file *s, void *unused)
{
struct clk_core *core = s->private;
int level = 0, i = 0;
unsigned long rate, rate_max = 0;
/* Find max frequency supported within voltage constraints. */
if (!core->vdd_class) {
rate_max = ULONG_MAX;
} else {
for (level = 0; level < core->num_rate_max; level++)
if (core->rate_max[level])
rate_max = core->rate_max[level];
}
/*
* List supported frequencies <= rate_max. Higher frequencies may
* appear in the frequency table, but are not valid and should not
* be listed.
*/
while (!IS_ERR_VALUE(rate =
core->ops->list_rate(core->hw, i++, rate_max))) {
if (rate <= 0)
break;
if (rate <= rate_max)
seq_printf(s, "%lu\n", rate);
}
return 0;
}
static int list_rates_open(struct inode *inode, struct file *file)
{
return single_open(file, list_rates_show, inode->i_private);
}
static const struct file_operations list_rates_fops = {
.open = list_rates_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static void clock_print_rate_max_by_level(struct seq_file *s, int level)
{
struct clk_core *core = s->private;
struct clk_vdd_class *vdd_class = core->vdd_class;
int off, i, vdd_level, nregs = vdd_class->num_regulators;
vdd_level = clk_find_vdd_level(core, core->rate);
seq_printf(s, "%2s%10lu", vdd_level == level ? "[" : "",
core->rate_max[level]);
for (i = 0; i < nregs; i++) {
off = nregs*level + i;
if (vdd_class->vdd_uv)
seq_printf(s, "%10u", vdd_class->vdd_uv[off]);
}
if (vdd_level == level)
seq_puts(s, "]");
seq_puts(s, "\n");
}
static int rate_max_show(struct seq_file *s, void *unused)
{
struct clk_core *core = s->private;
struct clk_vdd_class *vdd_class = core->vdd_class;
int level = 0, i, nregs = vdd_class->num_regulators;
char reg_name[10];
int vdd_level = clk_find_vdd_level(core, core->rate);
if (vdd_level < 0) {
seq_printf(s, "could not find_vdd_level for %s, %ld\n",
core->name, core->rate);
return 0;
}
seq_printf(s, "%12s", "");
for (i = 0; i < nregs; i++) {
snprintf(reg_name, ARRAY_SIZE(reg_name), "reg %d", i);
seq_printf(s, "%10s", reg_name);
}
seq_printf(s, "\n%12s", "freq");
for (i = 0; i < nregs; i++)
seq_printf(s, "%10s", "uV");
seq_puts(s, "\n");
for (level = 0; level < core->num_rate_max; level++)
clock_print_rate_max_by_level(s, level);
return 0;
}
static int rate_max_open(struct inode *inode, struct file *file)
{
return single_open(file, rate_max_show, inode->i_private);
}
static const struct file_operations rate_max_fops = {
.open = rate_max_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
{
struct dentry *d;
@ -2425,11 +2729,21 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
core->dentry = d;
d = debugfs_create_u32("clk_rate", S_IRUGO, core->dentry,
(u32 *)&core->rate);
d = debugfs_create_file("clk_rate", S_IRUGO, core->dentry, core,
&clock_rate_fops);
if (!d)
goto err_out;
if (core->ops->list_rate) {
if (!debugfs_create_file("clk_list_rates",
S_IRUGO, core->dentry, core, &list_rates_fops))
goto err_out;
}
if (core->vdd_class && !debugfs_create_file("clk_rate_max",
S_IRUGO, core->dentry, core, &rate_max_fops))
goto err_out;
d = debugfs_create_u32("clk_accuracy", S_IRUGO, core->dentry,
(u32 *)&core->accuracy);
if (!d)
@ -2450,8 +2764,8 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
if (!d)
goto err_out;
d = debugfs_create_u32("clk_enable_count", S_IRUGO, core->dentry,
(u32 *)&core->enable_count);
d = debugfs_create_file("clk_enable_count", S_IRUGO, core->dentry,
core, &clock_enable_fops);
if (!d)
goto err_out;
@ -2460,6 +2774,16 @@ static int clk_debug_create_one(struct clk_core *core, struct dentry *pdentry)
if (!d)
goto err_out;
d = debugfs_create_file("clk_parent", S_IRUGO, core->dentry, core,
&clock_parent_fops);
if (!d)
goto err_out;
d = debugfs_create_file("clk_print_regs", S_IRUGO, core->dentry,
core, &clock_print_hw_fops);
if (!d)
goto err_out;
if (core->ops->debug_init) {
ret = core->ops->debug_init(core->hw, core->dentry);
if (ret)
@ -2531,6 +2855,19 @@ struct dentry *clk_debugfs_add_file(struct clk_hw *hw, char *name, umode_t mode,
}
EXPORT_SYMBOL_GPL(clk_debugfs_add_file);
/*
* Print the names of all enabled clocks and their parents if
* debug_suspend is set from debugfs.
*/
void clock_debug_print_enabled(void)
{
if (likely(!debug_suspend))
return;
clock_debug_print_enabled_clocks(NULL);
}
EXPORT_SYMBOL_GPL(clock_debug_print_enabled);
/**
* clk_debug_init - lazily populate the debugfs clk directory
*
@ -2570,6 +2907,17 @@ static int __init clk_debug_init(void)
if (!d)
return -ENOMEM;
d = debugfs_create_file("clk_enabled_list", S_IRUGO, rootdir,
&clk_debug_list, &clk_enabled_list_fops);
if (!d)
return -ENOMEM;
d = debugfs_create_u32("debug_suspend", S_IRUGO | S_IWUSR,
rootdir, &debug_suspend);
if (!d)
return -ENOMEM;
mutex_lock(&clk_debug_lock);
hlist_for_each_entry(core, &clk_debug_list, debug_node)
clk_debug_create_one(core, rootdir);

View file

@ -20,6 +20,10 @@ struct clk *__of_clk_get_from_provider(struct of_phandle_args *clkspec,
struct clk *__clk_create_clk(struct clk_hw *hw, const char *dev_id,
const char *con_id);
void __clk_free_clk(struct clk *clk);
/* Debugfs API to print the enabled clocks */
void clock_debug_print_enabled(void);
#else
/* All these casts to avoid ifdefs in clkdev... */
static inline struct clk *

View file

@ -177,6 +177,14 @@ struct clk_rate_request {
* @set_flags: Set custom flags which deals with hardware specifics. Returns 0
* on success, -EEROR otherwise.
*
* @list_registers: Queries the hardware to get the current register contents.
* This callback is optional and required clocks could
* add this callback.
*
* @list_rate: Return the nth supported frequency for a given clock which is
* below rate_max on success and -ENXIO in case of no frequency
* table.
*
* The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow
* implementations to split any work between atomic (enable) and sleepable
* (prepare) contexts. If enabling a clock requires code that might sleep,
@ -217,6 +225,10 @@ struct clk_ops {
void (*init)(struct clk_hw *hw);
int (*debug_init)(struct clk_hw *hw, struct dentry *dentry);
int (*set_flags)(struct clk_hw *hw, unsigned flags);
void (*list_registers)(struct seq_file *f,
struct clk_hw *hw);
long (*list_rate)(struct clk_hw *hw, unsigned n,
unsigned long rate_max);
};
/**