| Message ID | 20191226060749.13881-1-cw00.choi@samsung.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Chanwoo Choi |
| Headers | show |
| Series | PM / devfreq: Add debugfs support with devfreq_summary file | expand |
Hi Chanwoo, On Thu, Dec 26, 2019 at 03:07:49PM +0900, Chanwoo Choi wrote: > Add debugfs interface to provide debugging information of devfreq device. > It contains 'devfreq_summary' entry to show the summary of registered > devfreq devices as following: And the additional debugfs file will be added. > - /sys/kernel/debug/devfreq/devfreq_summary > > [For example on Exynos5422-based Odroid-XU3 board] > - In order to show the multiple governors on devfreq_summay result, > change the governor of devfreq0 from simple_ondemand to userspace. > > $ cat /sys/kernel/debug/devfreq/devfreq_summary > dev name dev parent dev governor cur_freq min_freq max_freq > ------------------------------ ---------- ---------- --------------- ------------ ------------ ------------ > 10c20000.memory-controller devfreq0 userspace 165000000 165000000 825000000 > soc:bus_wcore devfreq1 simple_ondemand 400000000 84000000 400000000 > soc:bus_noc devfreq2 devfreq1 passive 100000000 67000000 100000000 > soc:bus_fsys_apb devfreq3 devfreq1 passive 200000000 100000000 200000000 > soc:bus_fsys devfreq4 devfreq1 passive 200000000 100000000 200000000 > soc:bus_fsys2 devfreq5 devfreq1 passive 150000000 75000000 150000000 > soc:bus_mfc devfreq6 devfreq1 passive 333000000 96000000 333000000 > soc:bus_gen devfreq7 devfreq1 passive 267000000 89000000 267000000 > soc:bus_peri devfreq8 devfreq1 passive 67000000 67000000 67000000 > soc:bus_g2d devfreq9 devfreq1 passive 333000000 84000000 333000000 > soc:bus_g2d_acp devfreq10 devfreq1 passive 267000000 67000000 267000000 > soc:bus_jpeg devfreq11 devfreq1 passive 300000000 75000000 300000000 > soc:bus_jpeg_apb devfreq12 devfreq1 passive 167000000 84000000 167000000 > soc:bus_disp1_fimd devfreq13 devfreq1 passive 200000000 120000000 200000000 > soc:bus_disp1 devfreq14 devfreq1 passive 300000000 120000000 300000000 > soc:bus_gscl_scaler devfreq15 devfreq1 passive 300000000 150000000 300000000 > soc:bus_mscl devfreq16 devfreq1 passive 400000000 84000000 400000000 > > Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> > --- > drivers/devfreq/devfreq.c | 65 +++++++++++++++++++++++++++++++++++++++ > 1 file changed, 65 insertions(+) > > diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c > index acd21345a070..d7177cc0a914 100644 > --- a/drivers/devfreq/devfreq.c > +++ b/drivers/devfreq/devfreq.c > @@ -10,6 +10,7 @@ > #include <linux/kernel.h> > #include <linux/kmod.h> > #include <linux/sched.h> > +#include <linux/debugfs.h> > #include <linux/errno.h> > #include <linux/err.h> > #include <linux/init.h> > @@ -33,6 +34,7 @@ > #define HZ_PER_KHZ 1000 > > static struct class *devfreq_class; > +static struct dentry *devfreq_debugfs; > > /* > * devfreq core provides delayed work based load monitoring helper > @@ -1670,6 +1672,62 @@ static struct attribute *devfreq_attrs[] = { > }; > ATTRIBUTE_GROUPS(devfreq); > > +static int devfreq_summary_show(struct seq_file *s, void *data) > +{ > + struct devfreq *devfreq; > + struct devfreq *parent_devfreq; > + unsigned long cur_freq, min_freq, max_freq; > + > + seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", > + "dev name", > + "dev", > + "parent dev", > + "governor", > + "cur_freq", > + "min_freq", > + "max_freq"); > + seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", > + "------------------------------", > + "----------", > + "----------", > + "---------------", > + "------------", > + "------------", > + "------------"); > + > + mutex_lock(&devfreq_list_lock); > + The 0day team has been doing builds with Clang and it pointed out that when CONFIG_DEVFREQ_GOV_PASSIVE is unset, parent_devfreq is always uninitialized. The else branch should probably be eliminated, moving the parent_devfreq NULL initialization above the if preprocessor directive. The full report is below. > + list_for_each_entry_reverse(devfreq, &devfreq_list, node) { > +#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) > + if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, > + DEVFREQ_NAME_LEN)) { > + struct devfreq_passive_data *data = devfreq->data; > + parent_devfreq = data->parent; > + } else { > + parent_devfreq = NULL; > + } > +#endif > + mutex_lock(&devfreq->lock); > + cur_freq = devfreq->previous_freq, > + get_freq_range(devfreq, &min_freq, &max_freq); > + mutex_unlock(&devfreq->lock); > + > + seq_printf(s, "%-30s %-10s %-10s %-15s %-12ld %-12ld %-12ld\n", > + dev_name(devfreq->dev.parent), > + dev_name(&devfreq->dev), > + parent_devfreq ? dev_name(&parent_devfreq->dev) : "", > + devfreq->governor_name, > + cur_freq, > + min_freq, > + max_freq); > + } > + > + mutex_unlock(&devfreq_list_lock); > + > + return 0; > +} > +DEFINE_SHOW_ATTRIBUTE(devfreq_summary); > + > static int __init devfreq_init(void) > { > devfreq_class = class_create(THIS_MODULE, "devfreq"); > @@ -1686,6 +1744,13 @@ static int __init devfreq_init(void) > } > devfreq_class->dev_groups = devfreq_groups; > > + devfreq_debugfs = debugfs_create_dir("devfreq", NULL); > + if (PTR_ERR(devfreq_debugfs) != -ENODEV && IS_ERR(devfreq_debugfs)) > + pr_warn("%s: couldn't create debugfs dir\n", __FILE__); > + > + debugfs_create_file("devfreq_summary", 0444, devfreq_debugfs, NULL, > + &devfreq_summary_fops); > + > return 0; > } > subsys_initcall(devfreq_init); > -- > 2.17.1 > Cheers, Nathan On Thu, Dec 26, 2019 at 11:47:26PM +0800, kbuild test robot wrote: > CC: kbuild-all@lists.01.org > In-Reply-To: <20191226060749.13881-1-cw00.choi@samsung.com> > References: <20191226060749.13881-1-cw00.choi@samsung.com> > TO: Chanwoo Choi <cw00.choi@samsung.com> > > Hi Chanwoo, > > I love your patch! Perhaps something to improve: > > [auto build test WARNING on linux/master] > [also build test WARNING on linus/master v5.5-rc3 next-20191220] > [if your patch is applied to the wrong git tree, please drop us a note to help > improve the system. BTW, we also suggest to use '--base' option to specify the > base tree in git format-patch, please see https://stackoverflow.com/a/37406982] > > url: https://github.com/0day-ci/linux/commits/Chanwoo-Choi/PM-devfreq-Add-debugfs-support-with-devfreq_summary-file/20191226-140227 > base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1522d9da40bdfe502c91163e6d769332897201fa > config: arm64-defconfig (attached as .config) > compiler: clang version 10.0.0 (git://gitmirror/llvm_project c5b4a2386b51a18daad7e42040c685c2e9708c47) > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # save the attached .config to linux build tree > make.cross ARCH=arm64 > > If you fix the issue, kindly add following tag > Reported-by: kbuild test robot <lkp@intel.com> > > All warnings (new ones prefixed by >>): > > >> drivers/devfreq/devfreq.c:1653:4: warning: variable 'parent_devfreq' is uninitialized when used here [-Wuninitialized] > parent_devfreq ? dev_name(&parent_devfreq->dev) : "", > ^~~~~~~~~~~~~~ > drivers/devfreq/devfreq.c:1613:32: note: initialize the variable 'parent_devfreq' to silence this warning > struct devfreq *parent_devfreq; > ^ > = NULL > 1 warning generated. > > vim +/parent_devfreq +1653 drivers/devfreq/devfreq.c > > 1609 > 1610 static int devfreq_summary_show(struct seq_file *s, void *data) > 1611 { > 1612 struct devfreq *devfreq; > 1613 struct devfreq *parent_devfreq; > 1614 unsigned long cur_freq, min_freq, max_freq; > 1615 > 1616 seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", > 1617 "dev name", > 1618 "dev", > 1619 "parent dev", > 1620 "governor", > 1621 "cur_freq", > 1622 "min_freq", > 1623 "max_freq"); > 1624 seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", > 1625 "------------------------------", > 1626 "----------", > 1627 "----------", > 1628 "---------------", > 1629 "------------", > 1630 "------------", > 1631 "------------"); > 1632 > 1633 mutex_lock(&devfreq_list_lock); > 1634 > 1635 list_for_each_entry_reverse(devfreq, &devfreq_list, node) { > 1636 #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) > 1637 if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, > 1638 DEVFREQ_NAME_LEN)) { > 1639 struct devfreq_passive_data *data = devfreq->data; > 1640 parent_devfreq = data->parent; > 1641 } else { > 1642 parent_devfreq = NULL; > 1643 } > 1644 #endif > 1645 mutex_lock(&devfreq->lock); > 1646 cur_freq = devfreq->previous_freq, > 1647 get_freq_range(devfreq, &min_freq, &max_freq); > 1648 mutex_unlock(&devfreq->lock); > 1649 > 1650 seq_printf(s, "%-30s %-10s %-10s %-15s %-12ld %-12ld %-12ld\n", > 1651 dev_name(devfreq->dev.parent), > 1652 dev_name(&devfreq->dev), > > 1653 parent_devfreq ? dev_name(&parent_devfreq->dev) : "", > 1654 devfreq->governor_name, > 1655 cur_freq, > 1656 min_freq, > 1657 max_freq); > 1658 } > 1659 > 1660 mutex_unlock(&devfreq_list_lock); > 1661 > 1662 return 0; > 1663 } > 1664 DEFINE_SHOW_ATTRIBUTE(devfreq_summary); > 1665 > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation >
Hi Nathan, On 12/30/19 12:26 PM, Nathan Chancellor wrote: > Hi Chanwoo, > > On Thu, Dec 26, 2019 at 03:07:49PM +0900, Chanwoo Choi wrote: >> Add debugfs interface to provide debugging information of devfreq device. >> It contains 'devfreq_summary' entry to show the summary of registered >> devfreq devices as following: And the additional debugfs file will be added. >> - /sys/kernel/debug/devfreq/devfreq_summary >> >> [For example on Exynos5422-based Odroid-XU3 board] >> - In order to show the multiple governors on devfreq_summay result, >> change the governor of devfreq0 from simple_ondemand to userspace. >> >> $ cat /sys/kernel/debug/devfreq/devfreq_summary >> dev name dev parent dev governor cur_freq min_freq max_freq >> ------------------------------ ---------- ---------- --------------- ------------ ------------ ------------ >> 10c20000.memory-controller devfreq0 userspace 165000000 165000000 825000000 >> soc:bus_wcore devfreq1 simple_ondemand 400000000 84000000 400000000 >> soc:bus_noc devfreq2 devfreq1 passive 100000000 67000000 100000000 >> soc:bus_fsys_apb devfreq3 devfreq1 passive 200000000 100000000 200000000 >> soc:bus_fsys devfreq4 devfreq1 passive 200000000 100000000 200000000 >> soc:bus_fsys2 devfreq5 devfreq1 passive 150000000 75000000 150000000 >> soc:bus_mfc devfreq6 devfreq1 passive 333000000 96000000 333000000 >> soc:bus_gen devfreq7 devfreq1 passive 267000000 89000000 267000000 >> soc:bus_peri devfreq8 devfreq1 passive 67000000 67000000 67000000 >> soc:bus_g2d devfreq9 devfreq1 passive 333000000 84000000 333000000 >> soc:bus_g2d_acp devfreq10 devfreq1 passive 267000000 67000000 267000000 >> soc:bus_jpeg devfreq11 devfreq1 passive 300000000 75000000 300000000 >> soc:bus_jpeg_apb devfreq12 devfreq1 passive 167000000 84000000 167000000 >> soc:bus_disp1_fimd devfreq13 devfreq1 passive 200000000 120000000 200000000 >> soc:bus_disp1 devfreq14 devfreq1 passive 300000000 120000000 300000000 >> soc:bus_gscl_scaler devfreq15 devfreq1 passive 300000000 150000000 300000000 >> soc:bus_mscl devfreq16 devfreq1 passive 400000000 84000000 400000000 >> >> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> >> --- >> drivers/devfreq/devfreq.c | 65 +++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 65 insertions(+) >> >> diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c >> index acd21345a070..d7177cc0a914 100644 >> --- a/drivers/devfreq/devfreq.c >> +++ b/drivers/devfreq/devfreq.c >> @@ -10,6 +10,7 @@ >> #include <linux/kernel.h> >> #include <linux/kmod.h> >> #include <linux/sched.h> >> +#include <linux/debugfs.h> >> #include <linux/errno.h> >> #include <linux/err.h> >> #include <linux/init.h> >> @@ -33,6 +34,7 @@ >> #define HZ_PER_KHZ 1000 >> >> static struct class *devfreq_class; >> +static struct dentry *devfreq_debugfs; >> >> /* >> * devfreq core provides delayed work based load monitoring helper >> @@ -1670,6 +1672,62 @@ static struct attribute *devfreq_attrs[] = { >> }; >> ATTRIBUTE_GROUPS(devfreq); >> >> +static int devfreq_summary_show(struct seq_file *s, void *data) >> +{ >> + struct devfreq *devfreq; >> + struct devfreq *parent_devfreq; >> + unsigned long cur_freq, min_freq, max_freq; >> + >> + seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", >> + "dev name", >> + "dev", >> + "parent dev", >> + "governor", >> + "cur_freq", >> + "min_freq", >> + "max_freq"); >> + seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", >> + "------------------------------", >> + "----------", >> + "----------", >> + "---------------", >> + "------------", >> + "------------", >> + "------------"); >> + >> + mutex_lock(&devfreq_list_lock); >> + > > The 0day team has been doing builds with Clang and it pointed out that > when CONFIG_DEVFREQ_GOV_PASSIVE is unset, parent_devfreq is always > uninitialized. The else branch should probably be eliminated, moving the > parent_devfreq NULL initialization above the if preprocessor directive. > > The full report is below. Thanks for the report. I'll fix it as following: struct devfreq *parent_devfreq = NULL; > >> + list_for_each_entry_reverse(devfreq, &devfreq_list, node) { >> +#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) >> + if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, >> + DEVFREQ_NAME_LEN)) { >> + struct devfreq_passive_data *data = devfreq->data; >> + parent_devfreq = data->parent; >> + } else { >> + parent_devfreq = NULL; >> + } >> +#endif >> + mutex_lock(&devfreq->lock); >> + cur_freq = devfreq->previous_freq, >> + get_freq_range(devfreq, &min_freq, &max_freq); >> + mutex_unlock(&devfreq->lock); >> + >> + seq_printf(s, "%-30s %-10s %-10s %-15s %-12ld %-12ld %-12ld\n", >> + dev_name(devfreq->dev.parent), >> + dev_name(&devfreq->dev), >> + parent_devfreq ? dev_name(&parent_devfreq->dev) : "", >> + devfreq->governor_name, >> + cur_freq, >> + min_freq, >> + max_freq); >> + } >> + >> + mutex_unlock(&devfreq_list_lock); >> + >> + return 0; >> +} >> +DEFINE_SHOW_ATTRIBUTE(devfreq_summary); >> + >> static int __init devfreq_init(void) >> { >> devfreq_class = class_create(THIS_MODULE, "devfreq"); >> @@ -1686,6 +1744,13 @@ static int __init devfreq_init(void) >> } >> devfreq_class->dev_groups = devfreq_groups; >> >> + devfreq_debugfs = debugfs_create_dir("devfreq", NULL); >> + if (PTR_ERR(devfreq_debugfs) != -ENODEV && IS_ERR(devfreq_debugfs)) >> + pr_warn("%s: couldn't create debugfs dir\n", __FILE__); >> + >> + debugfs_create_file("devfreq_summary", 0444, devfreq_debugfs, NULL, >> + &devfreq_summary_fops); >> + >> return 0; >> } >> subsys_initcall(devfreq_init); >> -- >> 2.17.1 >> > > Cheers, > Nathan > > On Thu, Dec 26, 2019 at 11:47:26PM +0800, kbuild test robot wrote: >> CC: kbuild-all@lists.01.org >> In-Reply-To: <20191226060749.13881-1-cw00.choi@samsung.com> >> References: <20191226060749.13881-1-cw00.choi@samsung.com> >> TO: Chanwoo Choi <cw00.choi@samsung.com> >> >> Hi Chanwoo, >> >> I love your patch! Perhaps something to improve: >> >> [auto build test WARNING on linux/master] >> [also build test WARNING on linus/master v5.5-rc3 next-20191220] >> [if your patch is applied to the wrong git tree, please drop us a note to help >> improve the system. BTW, we also suggest to use '--base' option to specify the >> base tree in git format-patch, please see https://stackoverflow.com/a/37406982] >> >> url: https://protect2.fireeye.com/url?k=aa57311e-f7cb307e-aa56ba51-0cc47a31307c-5e67a2de952cf65a&u=https://github.com/0day-ci/linux/commits/Chanwoo-Choi/PM-devfreq-Add-debugfs-support-with-devfreq_summary-file/20191226-140227 >> base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 1522d9da40bdfe502c91163e6d769332897201fa >> config: arm64-defconfig (attached as .config) >> compiler: clang version 10.0.0 (git://gitmirror/llvm_project c5b4a2386b51a18daad7e42040c685c2e9708c47) >> reproduce: >> wget https://protect2.fireeye.com/url?k=e9857e19-b4197f79-e984f556-0cc47a31307c-e0c94321f498a093&u=https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross >> chmod +x ~/bin/make.cross >> # save the attached .config to linux build tree >> make.cross ARCH=arm64 >> >> If you fix the issue, kindly add following tag >> Reported-by: kbuild test robot <lkp@intel.com> >> >> All warnings (new ones prefixed by >>): >> >>>> drivers/devfreq/devfreq.c:1653:4: warning: variable 'parent_devfreq' is uninitialized when used here [-Wuninitialized] >> parent_devfreq ? dev_name(&parent_devfreq->dev) : "", >> ^~~~~~~~~~~~~~ >> drivers/devfreq/devfreq.c:1613:32: note: initialize the variable 'parent_devfreq' to silence this warning >> struct devfreq *parent_devfreq; >> ^ >> = NULL >> 1 warning generated. >> >> vim +/parent_devfreq +1653 drivers/devfreq/devfreq.c >> >> 1609 >> 1610 static int devfreq_summary_show(struct seq_file *s, void *data) >> 1611 { >> 1612 struct devfreq *devfreq; >> 1613 struct devfreq *parent_devfreq; >> 1614 unsigned long cur_freq, min_freq, max_freq; >> 1615 >> 1616 seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", >> 1617 "dev name", >> 1618 "dev", >> 1619 "parent dev", >> 1620 "governor", >> 1621 "cur_freq", >> 1622 "min_freq", >> 1623 "max_freq"); >> 1624 seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", >> 1625 "------------------------------", >> 1626 "----------", >> 1627 "----------", >> 1628 "---------------", >> 1629 "------------", >> 1630 "------------", >> 1631 "------------"); >> 1632 >> 1633 mutex_lock(&devfreq_list_lock); >> 1634 >> 1635 list_for_each_entry_reverse(devfreq, &devfreq_list, node) { >> 1636 #if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) >> 1637 if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, >> 1638 DEVFREQ_NAME_LEN)) { >> 1639 struct devfreq_passive_data *data = devfreq->data; >> 1640 parent_devfreq = data->parent; >> 1641 } else { >> 1642 parent_devfreq = NULL; >> 1643 } >> 1644 #endif >> 1645 mutex_lock(&devfreq->lock); >> 1646 cur_freq = devfreq->previous_freq, >> 1647 get_freq_range(devfreq, &min_freq, &max_freq); >> 1648 mutex_unlock(&devfreq->lock); >> 1649 >> 1650 seq_printf(s, "%-30s %-10s %-10s %-15s %-12ld %-12ld %-12ld\n", >> 1651 dev_name(devfreq->dev.parent), >> 1652 dev_name(&devfreq->dev), >>> 1653 parent_devfreq ? dev_name(&parent_devfreq->dev) : "", >> 1654 devfreq->governor_name, >> 1655 cur_freq, >> 1656 min_freq, >> 1657 max_freq); >> 1658 } >> 1659 >> 1660 mutex_unlock(&devfreq_list_lock); >> 1661 >> 1662 return 0; >> 1663 } >> 1664 DEFINE_SHOW_ATTRIBUTE(devfreq_summary); >> 1665 >> >> --- >> 0-DAY kernel test infrastructure Open Source Technology Center >> https://protect2.fireeye.com/url?k=f6f1d925-ab6dd845-f6f0526a-0cc47a31307c-7e8a6c295935ff12&u=https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation >> > >
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index acd21345a070..d7177cc0a914 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -10,6 +10,7 @@ #include <linux/kernel.h> #include <linux/kmod.h> #include <linux/sched.h> +#include <linux/debugfs.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/init.h> @@ -33,6 +34,7 @@ #define HZ_PER_KHZ 1000 static struct class *devfreq_class; +static struct dentry *devfreq_debugfs; /* * devfreq core provides delayed work based load monitoring helper @@ -1670,6 +1672,62 @@ static struct attribute *devfreq_attrs[] = { }; ATTRIBUTE_GROUPS(devfreq); +static int devfreq_summary_show(struct seq_file *s, void *data) +{ + struct devfreq *devfreq; + struct devfreq *parent_devfreq; + unsigned long cur_freq, min_freq, max_freq; + + seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", + "dev name", + "dev", + "parent dev", + "governor", + "cur_freq", + "min_freq", + "max_freq"); + seq_printf(s, "%-30s %-10s %-10s %-15s %-12s %-12s %-12s\n", + "------------------------------", + "----------", + "----------", + "---------------", + "------------", + "------------", + "------------"); + + mutex_lock(&devfreq_list_lock); + + list_for_each_entry_reverse(devfreq, &devfreq_list, node) { +#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE) + if (!strncmp(devfreq->governor_name, DEVFREQ_GOV_PASSIVE, + DEVFREQ_NAME_LEN)) { + struct devfreq_passive_data *data = devfreq->data; + parent_devfreq = data->parent; + } else { + parent_devfreq = NULL; + } +#endif + mutex_lock(&devfreq->lock); + cur_freq = devfreq->previous_freq, + get_freq_range(devfreq, &min_freq, &max_freq); + mutex_unlock(&devfreq->lock); + + seq_printf(s, "%-30s %-10s %-10s %-15s %-12ld %-12ld %-12ld\n", + dev_name(devfreq->dev.parent), + dev_name(&devfreq->dev), + parent_devfreq ? dev_name(&parent_devfreq->dev) : "", + devfreq->governor_name, + cur_freq, + min_freq, + max_freq); + } + + mutex_unlock(&devfreq_list_lock); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(devfreq_summary); + static int __init devfreq_init(void) { devfreq_class = class_create(THIS_MODULE, "devfreq"); @@ -1686,6 +1744,13 @@ static int __init devfreq_init(void) } devfreq_class->dev_groups = devfreq_groups; + devfreq_debugfs = debugfs_create_dir("devfreq", NULL); + if (PTR_ERR(devfreq_debugfs) != -ENODEV && IS_ERR(devfreq_debugfs)) + pr_warn("%s: couldn't create debugfs dir\n", __FILE__); + + debugfs_create_file("devfreq_summary", 0444, devfreq_debugfs, NULL, + &devfreq_summary_fops); + return 0; } subsys_initcall(devfreq_init);
Add debugfs interface to provide debugging information of devfreq device. It contains 'devfreq_summary' entry to show the summary of registered devfreq devices as following: And the additional debugfs file will be added. - /sys/kernel/debug/devfreq/devfreq_summary [For example on Exynos5422-based Odroid-XU3 board] - In order to show the multiple governors on devfreq_summay result, change the governor of devfreq0 from simple_ondemand to userspace. $ cat /sys/kernel/debug/devfreq/devfreq_summary dev name dev parent dev governor cur_freq min_freq max_freq ------------------------------ ---------- ---------- --------------- ------------ ------------ ------------ 10c20000.memory-controller devfreq0 userspace 165000000 165000000 825000000 soc:bus_wcore devfreq1 simple_ondemand 400000000 84000000 400000000 soc:bus_noc devfreq2 devfreq1 passive 100000000 67000000 100000000 soc:bus_fsys_apb devfreq3 devfreq1 passive 200000000 100000000 200000000 soc:bus_fsys devfreq4 devfreq1 passive 200000000 100000000 200000000 soc:bus_fsys2 devfreq5 devfreq1 passive 150000000 75000000 150000000 soc:bus_mfc devfreq6 devfreq1 passive 333000000 96000000 333000000 soc:bus_gen devfreq7 devfreq1 passive 267000000 89000000 267000000 soc:bus_peri devfreq8 devfreq1 passive 67000000 67000000 67000000 soc:bus_g2d devfreq9 devfreq1 passive 333000000 84000000 333000000 soc:bus_g2d_acp devfreq10 devfreq1 passive 267000000 67000000 267000000 soc:bus_jpeg devfreq11 devfreq1 passive 300000000 75000000 300000000 soc:bus_jpeg_apb devfreq12 devfreq1 passive 167000000 84000000 167000000 soc:bus_disp1_fimd devfreq13 devfreq1 passive 200000000 120000000 200000000 soc:bus_disp1 devfreq14 devfreq1 passive 300000000 120000000 300000000 soc:bus_gscl_scaler devfreq15 devfreq1 passive 300000000 150000000 300000000 soc:bus_mscl devfreq16 devfreq1 passive 400000000 84000000 400000000 Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> --- drivers/devfreq/devfreq.c | 65 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+)