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cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx()

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Pointer subtraction is slow and tedious. Therefore, replace all instances
where cpufreq_for_each_{valid_,}entry loops contained such substractions
with an iteration macro providing an index to the frequency_table entry.

Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Link: http://lkml.kernel.org/r/20180120020237.GM13338@ZenIV.linux.org.uk
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Dominik Brodowski 2018-01-30 06:42:37 +01:00 committed by Rafael J. Wysocki
parent 70f6bf2a3b
commit ffd81dcfef
8 changed files with 100 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/cpu-freq/cpu-drivers.txt
View File

@ -291,3 +291,7 @@ For example:
/* Do something with pos */
pos->frequency = ...
}
If you need to work with the position of pos within driver_freq_table,
do not subtract the pointers, as it is quite costly. Instead, use the
macros cpufreq_for_each_entry_idx() and cpufreq_for_each_valid_entry_idx().

7
drivers/cpufreq/exynos5440-cpufreq.c
View File

@ -115,10 +115,10 @@ static struct cpufreq_freqs freqs;
static int init_div_table(void)
{
struct cpufreq_frequency_table *pos, *freq_tbl = dvfs_info->freq_table;
unsigned int tmp, clk_div, ema_div, freq, volt_id;
unsigned int tmp, clk_div, ema_div, freq, volt_id, idx;
struct dev_pm_opp *opp;
cpufreq_for_each_entry(pos, freq_tbl) {
cpufreq_for_each_entry_idx(pos, freq_tbl, idx) {
opp = dev_pm_opp_find_freq_exact(dvfs_info->dev,
pos->frequency * 1000, true);
if (IS_ERR(opp)) {
@ -154,8 +154,7 @@ static int init_div_table(void)
tmp = (clk_div | ema_div | (volt_id << P0_7_VDD_SHIFT)
| ((freq / FREQ_UNIT) << P0_7_FREQ_SHIFT));
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 *
(pos - freq_tbl));
__raw_writel(tmp, dvfs_info->base + XMU_PMU_P0_7 + 4 * idx);
dev_pm_opp_put(opp);
}

8
drivers/cpufreq/freq_table.c
View File

@ -143,10 +143,9 @@ int cpufreq_table_index_unsorted(struct cpufreq_policy *policy,
break;
}
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, i) {
freq = pos->frequency;
i = pos - table;
if ((freq < policy->min) || (freq > policy->max))
continue;
if (freq == target_freq) {
@ -211,15 +210,16 @@ int cpufreq_frequency_table_get_index(struct cpufreq_policy *policy,
unsigned int freq)
{
struct cpufreq_frequency_table *pos, *table = policy->freq_table;
int idx;
if (unlikely(!table)) {
pr_debug("%s: Unable to find frequency table\n", __func__);
return -ENOENT;
}
cpufreq_for_each_valid_entry(pos, table)
cpufreq_for_each_valid_entry_idx(pos, table, idx)
if (pos->frequency == freq)
return pos - table;
return idx;
return -EINVAL;
}

4
drivers/cpufreq/longhaul.c
View File

@ -600,7 +600,7 @@ static void longhaul_setup_voltagescaling(void)
/* Calculate kHz for one voltage step */
kHz_step = (highest_speed - min_vid_speed) / numvscales;
cpufreq_for_each_entry(freq_pos, longhaul_table) {
cpufreq_for_each_entry_idx(freq_pos, longhaul_table, j) {
speed = freq_pos->frequency;
if (speed > min_vid_speed)
pos = (speed - min_vid_speed) / kHz_step + minvid.pos;
@ -609,7 +609,7 @@ static void longhaul_setup_voltagescaling(void)
freq_pos->driver_data |= mV_vrm_table[pos] << 8;
vid = vrm_mV_table[mV_vrm_table[pos]];
pr_info("f: %d kHz, index: %d, vid: %d mV\n",
speed, (int)(freq_pos - longhaul_table), vid.mV);
speed, j, vid.mV);
}
can_scale_voltage = 1;

6
drivers/cpufreq/pasemi-cpufreq.c
View File

@ -139,7 +139,7 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
struct cpufreq_frequency_table *pos;
const u32 *max_freqp;
u32 max_freq;
int cur_astate;
int cur_astate, idx;
struct resource res;
struct device_node *cpu, *dn;
int err = -ENODEV;
@ -198,9 +198,9 @@ static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
pr_debug("initializing frequency table\n");
/* initialize frequency table */
cpufreq_for_each_entry(pos, pas_freqs) {
cpufreq_for_each_entry_idx(pos, pas_freqs, idx) {
pos->frequency = get_astate_freq(pos->driver_data) * 100000;
pr_debug("%d: %d\n", (int)(pos - pas_freqs), pos->frequency);
pr_debug("%d: %d\n", idx, pos->frequency);
}
cur_astate = get_cur_astate(policy->cpu);

5
drivers/sh/clk/core.c
View File

@ -197,10 +197,11 @@ int clk_rate_table_find(struct clk *clk,
unsigned long rate)
{
struct cpufreq_frequency_table *pos;
int idx;
cpufreq_for_each_valid_entry(pos, freq_table)
cpufreq_for_each_valid_entry_idx(pos, freq_table, idx)
if (pos->frequency == rate)
return pos - freq_table;
return idx;
return -ENOENT;
}

4
drivers/staging/irda/drivers/sh_sir.c
View File

@ -226,7 +226,7 @@ static u32 sh_sir_find_sclk(struct clk *irda_clk)
clk_put(pclk);
/* IrDA can not set over peripheral_clk */
cpufreq_for_each_valid_entry(pos, freq_table) {
cpufreq_for_each_valid_entry_idx(pos, freq_table, index) {
u32 freq = pos->frequency;
/* IrDA should not over peripheral_clk */
@ -236,7 +236,7 @@ static u32 sh_sir_find_sclk(struct clk *irda_clk)
tmp = freq % SCLK_BASE;
if (tmp < min) {
min = tmp;
index = pos - freq_table;
break;
}
}

125
include/linux/cpufreq.h
View File

@ -628,6 +628,18 @@ static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
#define cpufreq_for_each_entry(pos, table) \
for (pos = table; pos->frequency != CPUFREQ_TABLE_END; pos++)
/*
* cpufreq_for_each_entry_idx - iterate over a cpufreq_frequency_table
* with index
* @pos: the cpufreq_frequency_table * to use as a loop cursor.
* @table: the cpufreq_frequency_table * to iterate over.
* @idx: the table entry currently being processed
*/
#define cpufreq_for_each_entry_idx(pos, table, idx) \
for (pos = table, idx = 0; pos->frequency != CPUFREQ_TABLE_END; \
pos++, idx++)
/*
* cpufreq_for_each_valid_entry - iterate over a cpufreq_frequency_table
* excluding CPUFREQ_ENTRY_INVALID frequencies.
@ -641,6 +653,21 @@ static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
continue; \
else
/*
* cpufreq_for_each_valid_entry_idx - iterate with index over a cpufreq
* frequency_table excluding CPUFREQ_ENTRY_INVALID frequencies.
* @pos: the cpufreq_frequency_table * to use as a loop cursor.
* @table: the cpufreq_frequency_table * to iterate over.
* @idx: the table entry currently being processed
*/
#define cpufreq_for_each_valid_entry_idx(pos, table, idx) \
cpufreq_for_each_entry_idx(pos, table, idx) \
if (pos->frequency == CPUFREQ_ENTRY_INVALID) \
continue; \
else
int cpufreq_frequency_table_cpuinfo(struct cpufreq_policy *policy,
struct cpufreq_frequency_table *table);
@ -667,19 +694,20 @@ static inline int cpufreq_table_find_index_al(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq >= target_freq)
return pos - table;
return idx;
best = pos;
best = idx;
}
return best - table;
return best;
}
/* Find lowest freq at or above target in a table in descending order */
@ -687,28 +715,29 @@ static inline int cpufreq_table_find_index_dl(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq > target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found above target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Works only on sorted freq-tables */
@ -728,28 +757,29 @@ static inline int cpufreq_table_find_index_ah(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq < target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found below target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Find highest freq at or below target in a table in descending order */
@ -757,19 +787,20 @@ static inline int cpufreq_table_find_index_dh(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq <= target_freq)
return pos - table;
return idx;
best = pos;
best = idx;
}
return best - table;
return best;
}
/* Works only on sorted freq-tables */
@ -789,32 +820,33 @@ static inline int cpufreq_table_find_index_ac(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq < target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found below target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
/* Choose the closest freq */
if (target_freq - best->frequency > freq - target_freq)
return pos - table;
if (target_freq - table[best].frequency > freq - target_freq)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Find closest freq to target in a table in descending order */
@ -822,32 +854,33 @@ static inline int cpufreq_table_find_index_dc(struct cpufreq_policy *policy,
unsigned int target_freq)
{
struct cpufreq_frequency_table *table = policy->freq_table;
struct cpufreq_frequency_table *pos, *best = table - 1;
struct cpufreq_frequency_table *pos;
unsigned int freq;
int idx, best = -1;
cpufreq_for_each_valid_entry(pos, table) {
cpufreq_for_each_valid_entry_idx(pos, table, idx) {
freq = pos->frequency;
if (freq == target_freq)
return pos - table;
return idx;
if (freq > target_freq) {
best = pos;
best = idx;
continue;
}
/* No freq found above target_freq */
if (best == table - 1)
return pos - table;
if (best == -1)
return idx;
/* Choose the closest freq */
if (best->frequency - target_freq > target_freq - freq)
return pos - table;
if (table[best].frequency - target_freq > target_freq - freq)
return idx;
return best - table;
return best;
}
return best - table;
return best;
}
/* Works only on sorted freq-tables */