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authorDominik Brodowski <linux@dominikbrodowski.net>2018-01-30 06:42:37 +0100
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-02-08 10:21:39 +0100
commitffd81dcfef85a33729f90e4acd2f61a68e56b993 (patch)
tree4160debd7778d436e027edf810e438266953dc11
parent70f6bf2a3b7e40c3f802b0ea837762a8bc6c1430 (diff)
cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx()
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>
-rw-r--r--Documentation/cpu-freq/cpu-drivers.txt4
-rw-r--r--drivers/cpufreq/exynos5440-cpufreq.c7
-rw-r--r--drivers/cpufreq/freq_table.c8
-rw-r--r--drivers/cpufreq/longhaul.c4
-rw-r--r--drivers/cpufreq/pasemi-cpufreq.c6
-rw-r--r--drivers/sh/clk/core.c5
-rw-r--r--drivers/staging/irda/drivers/sh_sir.c4
-rw-r--r--include/linux/cpufreq.h125
8 files changed, 100 insertions, 63 deletions
diff --git a/Documentation/cpu-freq/cpu-drivers.txt b/Documentation/cpu-freq/cpu-drivers.txt
index 434c49cc7330..61546ac578d6 100644
--- a/Documentation/cpu-freq/cpu-drivers.txt
+++ b/Documentation/cpu-freq/cpu-drivers.txt
@@ -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().
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
index b6b369c22272..932caa386ece 100644
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -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);
}
diff --git a/drivers/cpufreq/freq_table.c b/drivers/cpufreq/freq_table.c
index 3bbbf9e6960c..6d007f824ca7 100644
--- a/drivers/cpufreq/freq_table.c
+++ b/drivers/cpufreq/freq_table.c
@@ -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;
}
diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
index 5faa37c5b091..942632a27b50 100644
--- a/drivers/cpufreq/longhaul.c
+++ b/drivers/cpufreq/longhaul.c
@@ -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;
diff --git a/drivers/cpufreq/pasemi-cpufreq.c b/drivers/cpufreq/pasemi-cpufreq.c
index b257fc7d5204..75dfbd2a58ea 100644
--- a/drivers/cpufreq/pasemi-cpufreq.c
+++ b/drivers/cpufreq/pasemi-cpufreq.c
@@ -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);
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c
index 92863e3818e5..9475353f49d6 100644
--- a/drivers/sh/clk/core.c
+++ b/drivers/sh/clk/core.c
@@ -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;
}
diff --git a/drivers/staging/irda/drivers/sh_sir.c b/drivers/staging/irda/drivers/sh_sir.c
index fede6864c737..0d0687cc454a 100644
--- a/drivers/staging/irda/drivers/sh_sir.c
+++ b/drivers/staging/irda/drivers/sh_sir.c
@@ -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;
}
}
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 065f3a8eb486..21e8d248d956 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -629,6 +629,18 @@ static inline void dev_pm_opp_free_cpufreq_table(struct device *dev,
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.
* @pos: the cpufreq_frequency_table * to use as a loop cursor.
@@ -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 */

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