* [PATCH 11/17] rtc: m41t80: constify m41t80_rtc_ops
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Use RTC_FEATURE_ALARM to signal to the core whether alarms are available
instead of changing the global struct rtc_class_ops, allowing to make it
const.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-m41t80.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 160dcf68e64e..e3ddd660d68c 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -397,10 +397,13 @@ static int m41t80_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
return 0;
}
-static struct rtc_class_ops m41t80_rtc_ops = {
+static const struct rtc_class_ops m41t80_rtc_ops = {
.read_time = m41t80_rtc_read_time,
.set_time = m41t80_rtc_set_time,
.proc = m41t80_rtc_proc,
+ .read_alarm = m41t80_read_alarm,
+ .set_alarm = m41t80_set_alarm,
+ .alarm_irq_enable = m41t80_alarm_irq_enable,
};
#ifdef CONFIG_PM_SLEEP
@@ -913,13 +916,10 @@ static int m41t80_probe(struct i2c_client *client,
wakeup_source = false;
}
}
- if (client->irq > 0 || wakeup_source) {
- m41t80_rtc_ops.read_alarm = m41t80_read_alarm;
- m41t80_rtc_ops.set_alarm = m41t80_set_alarm;
- m41t80_rtc_ops.alarm_irq_enable = m41t80_alarm_irq_enable;
- /* Enable the wakealarm */
+ if (client->irq > 0 || wakeup_source)
device_init_wakeup(&client->dev, true);
- }
+ else
+ clear_bit(RTC_FEATURE_ALARM, m41t80_data->rtc->features);
m41t80_data->rtc->ops = &m41t80_rtc_ops;
m41t80_data->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
--
2.29.2
^ permalink raw reply related
* [PATCH 05/17] rtc: mv: remove mv_rtc_alarm_ops
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Move the alarm callbacks in mv_rtc_ops and clear RTC_FEATURE_ALARM to
signal that alarms are not available instead of having a supplementary
struct rtc_class_ops.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-mv.c | 14 ++++----------
1 file changed, 4 insertions(+), 10 deletions(-)
diff --git a/drivers/rtc/rtc-mv.c b/drivers/rtc/rtc-mv.c
index f8e2ecea1d8d..6c526e2ec56d 100644
--- a/drivers/rtc/rtc-mv.c
+++ b/drivers/rtc/rtc-mv.c
@@ -200,11 +200,6 @@ static irqreturn_t mv_rtc_interrupt(int irq, void *data)
static const struct rtc_class_ops mv_rtc_ops = {
.read_time = mv_rtc_read_time,
.set_time = mv_rtc_set_time,
-};
-
-static const struct rtc_class_ops mv_rtc_alarm_ops = {
- .read_time = mv_rtc_read_time,
- .set_time = mv_rtc_set_time,
.read_alarm = mv_rtc_read_alarm,
.set_alarm = mv_rtc_set_alarm,
.alarm_irq_enable = mv_rtc_alarm_irq_enable,
@@ -268,13 +263,12 @@ static int __init mv_rtc_probe(struct platform_device *pdev)
}
}
- if (pdata->irq >= 0) {
+ if (pdata->irq >= 0)
device_init_wakeup(&pdev->dev, 1);
- pdata->rtc->ops = &mv_rtc_alarm_ops;
- } else {
- pdata->rtc->ops = &mv_rtc_ops;
- }
+ else
+ clear_bit(RTC_FEATURE_ALARM, pdata->rtc->features);
+ pdata->rtc->ops = &mv_rtc_ops;
pdata->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
pdata->rtc->range_max = RTC_TIMESTAMP_END_2099;
--
2.29.2
^ permalink raw reply related
* [PATCH 06/17] rtc: m48t59: remove m48t02_rtc_ops
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Clear RTC_FEATURE_ALARM to signal that alarms are not available instead of
having a supplementary struct rtc_class_ops without alarm callbacks.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-m48t59.c | 22 ++++++++--------------
1 file changed, 8 insertions(+), 14 deletions(-)
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 5f5898d3b055..1d2e99a70fce 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -313,11 +313,6 @@ static const struct rtc_class_ops m48t59_rtc_ops = {
.alarm_irq_enable = m48t59_rtc_alarm_irq_enable,
};
-static const struct rtc_class_ops m48t02_rtc_ops = {
- .read_time = m48t59_rtc_read_time,
- .set_time = m48t59_rtc_set_time,
-};
-
static int m48t59_nvram_read(void *priv, unsigned int offset, void *val,
size_t size)
{
@@ -366,7 +361,6 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
struct m48t59_private *m48t59 = NULL;
struct resource *res;
int ret = -ENOMEM;
- const struct rtc_class_ops *ops;
struct nvmem_config nvmem_cfg = {
.name = "m48t59-",
.word_size = 1,
@@ -438,17 +432,21 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
if (ret)
return ret;
}
+
+ m48t59->rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(m48t59->rtc))
+ return PTR_ERR(m48t59->rtc);
+
switch (pdata->type) {
case M48T59RTC_TYPE_M48T59:
- ops = &m48t59_rtc_ops;
pdata->offset = 0x1ff0;
break;
case M48T59RTC_TYPE_M48T02:
- ops = &m48t02_rtc_ops;
+ clear_bit(RTC_FEATURE_ALARM, m48t59->rtc->features);
pdata->offset = 0x7f0;
break;
case M48T59RTC_TYPE_M48T08:
- ops = &m48t02_rtc_ops;
+ clear_bit(RTC_FEATURE_ALARM, m48t59->rtc->features);
pdata->offset = 0x1ff0;
break;
default:
@@ -459,11 +457,7 @@ static int m48t59_rtc_probe(struct platform_device *pdev)
spin_lock_init(&m48t59->lock);
platform_set_drvdata(pdev, m48t59);
- m48t59->rtc = devm_rtc_allocate_device(&pdev->dev);
- if (IS_ERR(m48t59->rtc))
- return PTR_ERR(m48t59->rtc);
-
- m48t59->rtc->ops = ops;
+ m48t59->rtc->ops = &m48t59_rtc_ops;
nvmem_cfg.size = pdata->offset;
ret = devm_rtc_nvmem_register(m48t59->rtc, &nvmem_cfg);
--
2.29.2
^ permalink raw reply related
* [PATCH 09/17] rtc: rx8010: drop a struct rtc_class_ops
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Merge both struct rtc_class_ops in a single one and use RTC_FEATURE_ALARM
to signal to the core whether alarms are available.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-rx8010.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)
diff --git a/drivers/rtc/rtc-rx8010.c b/drivers/rtc/rtc-rx8010.c
index 8340ab47a059..1a05e4654290 100644
--- a/drivers/rtc/rtc-rx8010.c
+++ b/drivers/rtc/rtc-rx8010.c
@@ -354,13 +354,7 @@ static int rx8010_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
}
}
-static const struct rtc_class_ops rx8010_rtc_ops_default = {
- .read_time = rx8010_get_time,
- .set_time = rx8010_set_time,
- .ioctl = rx8010_ioctl,
-};
-
-static const struct rtc_class_ops rx8010_rtc_ops_alarm = {
+static const struct rtc_class_ops rx8010_rtc_ops = {
.read_time = rx8010_get_time,
.set_time = rx8010_set_time,
.ioctl = rx8010_ioctl,
@@ -409,12 +403,11 @@ static int rx8010_probe(struct i2c_client *client)
dev_err(dev, "unable to request IRQ\n");
return err;
}
-
- rx8010->rtc->ops = &rx8010_rtc_ops_alarm;
} else {
- rx8010->rtc->ops = &rx8010_rtc_ops_default;
+ clear_bit(RTC_FEATURE_ALARM, rx8010->rtc->features);
}
+ rx8010->rtc->ops = &rx8010_rtc_ops;
rx8010->rtc->max_user_freq = 1;
rx8010->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
rx8010->rtc->range_max = RTC_TIMESTAMP_END_2099;
--
2.29.2
^ permalink raw reply related
* [PATCH 08/17] rtc: pcf85063: remove pcf85063_rtc_ops_alarm
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Move the alarm callbacks in pcf85063_rtc_ops and use RTC_FEATURE_ALARM to
signal to the core whether alarms are available instead of having a
supplementary struct rtc_class_ops without alarm callbacks.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-pcf85063.c | 11 ++---------
1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index e19cf2adbc35..f7e7c9eb0781 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -307,14 +307,6 @@ static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
}
static const struct rtc_class_ops pcf85063_rtc_ops = {
- .read_time = pcf85063_rtc_read_time,
- .set_time = pcf85063_rtc_set_time,
- .read_offset = pcf85063_read_offset,
- .set_offset = pcf85063_set_offset,
- .ioctl = pcf85063_ioctl,
-};
-
-static const struct rtc_class_ops pcf85063_rtc_ops_alarm = {
.read_time = pcf85063_rtc_read_time,
.set_time = pcf85063_rtc_set_time,
.read_offset = pcf85063_read_offset,
@@ -587,6 +579,7 @@ static int pcf85063_probe(struct i2c_client *client)
pcf85063->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
pcf85063->rtc->range_max = RTC_TIMESTAMP_END_2099;
pcf85063->rtc->uie_unsupported = 1;
+ clear_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
if (config->has_alarms && client->irq > 0) {
err = devm_request_threaded_irq(&client->dev, client->irq,
@@ -597,7 +590,7 @@ static int pcf85063_probe(struct i2c_client *client)
dev_warn(&pcf85063->rtc->dev,
"unable to request IRQ, alarms disabled\n");
} else {
- pcf85063->rtc->ops = &pcf85063_rtc_ops_alarm;
+ set_bit(RTC_FEATURE_ALARM, pcf85063->rtc->features);
device_init_wakeup(&client->dev, true);
err = dev_pm_set_wake_irq(&client->dev, client->irq);
if (err)
--
2.29.2
^ permalink raw reply related
* [PATCH 07/17] rtc: pcf2127: remove pcf2127_rtc_alrm_ops
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Move the alarm callbacks in pcf2127_rtc_ops and use RTC_FEATURE_ALARM to
signal to the core whether alarms are available instead of having a
supplementary struct rtc_class_ops without alarm callbacks.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-pcf2127.c | 11 +++--------
1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c
index 39a7b5116aa4..68160d857ac1 100644
--- a/drivers/rtc/rtc-pcf2127.c
+++ b/drivers/rtc/rtc-pcf2127.c
@@ -225,12 +225,6 @@ static int pcf2127_rtc_ioctl(struct device *dev,
}
}
-static const struct rtc_class_ops pcf2127_rtc_ops = {
- .ioctl = pcf2127_rtc_ioctl,
- .read_time = pcf2127_rtc_read_time,
- .set_time = pcf2127_rtc_set_time,
-};
-
static int pcf2127_nvmem_read(void *priv, unsigned int offset,
void *val, size_t bytes)
{
@@ -459,7 +453,7 @@ static irqreturn_t pcf2127_rtc_irq(int irq, void *dev)
return IRQ_HANDLED;
}
-static const struct rtc_class_ops pcf2127_rtc_alrm_ops = {
+static const struct rtc_class_ops pcf2127_rtc_ops = {
.ioctl = pcf2127_rtc_ioctl,
.read_time = pcf2127_rtc_read_time,
.set_time = pcf2127_rtc_set_time,
@@ -584,6 +578,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
pcf2127->rtc->range_max = RTC_TIMESTAMP_END_2099;
pcf2127->rtc->set_start_time = true; /* Sets actual start to 1970 */
pcf2127->rtc->uie_unsupported = 1;
+ clear_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
if (alarm_irq > 0) {
ret = devm_request_threaded_irq(dev, alarm_irq, NULL,
@@ -598,7 +593,7 @@ static int pcf2127_probe(struct device *dev, struct regmap *regmap,
if (alarm_irq > 0 || device_property_read_bool(dev, "wakeup-source")) {
device_init_wakeup(dev, true);
- pcf2127->rtc->ops = &pcf2127_rtc_alrm_ops;
+ set_bit(RTC_FEATURE_ALARM, pcf2127->rtc->features);
}
if (has_nvmem) {
--
2.29.2
^ permalink raw reply related
* [PATCH 04/17] rtc: cmos: remove cmos_rtc_ops_no_alarm
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Clear RTC_FEATURE_ALARM to signal that alarms are not available instead of
having a supplementary struct rtc_class_ops with a NULL .set_alarm.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-cmos.c | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 51e80bc70d42..c3746e249f5a 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -574,12 +574,6 @@ static const struct rtc_class_ops cmos_rtc_ops = {
.alarm_irq_enable = cmos_alarm_irq_enable,
};
-static const struct rtc_class_ops cmos_rtc_ops_no_alarm = {
- .read_time = cmos_read_time,
- .set_time = cmos_set_time,
- .proc = cmos_procfs,
-};
-
/*----------------------------------------------------------------*/
/*
@@ -857,12 +851,12 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
goto cleanup1;
}
-
- cmos_rtc.rtc->ops = &cmos_rtc_ops;
} else {
- cmos_rtc.rtc->ops = &cmos_rtc_ops_no_alarm;
+ clear_bit(RTC_FEATURE_ALARM, cmos_rtc.rtc->features);
}
+ cmos_rtc.rtc->ops = &cmos_rtc_ops;
+
retval = devm_rtc_register_device(cmos_rtc.rtc);
if (retval)
goto cleanup2;
--
2.29.2
^ permalink raw reply related
* [PATCH 03/17] rtc: armada38x: remove armada38x_rtc_ops_noirq
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Andrew Lunn, Gregory Clement, Sebastian Hesselbarth,
Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Clear RTC_FEATURE_ALARM to signal that alarms are not available instead of
having a supplementary struct rtc_class_ops with a NULL .set_alarm.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-armada38x.c | 21 ++++-----------------
1 file changed, 4 insertions(+), 17 deletions(-)
diff --git a/drivers/rtc/rtc-armada38x.c b/drivers/rtc/rtc-armada38x.c
index 807a79c07f08..cc542e6b1d5b 100644
--- a/drivers/rtc/rtc-armada38x.c
+++ b/drivers/rtc/rtc-armada38x.c
@@ -458,14 +458,6 @@ static const struct rtc_class_ops armada38x_rtc_ops = {
.set_offset = armada38x_rtc_set_offset,
};
-static const struct rtc_class_ops armada38x_rtc_ops_noirq = {
- .read_time = armada38x_rtc_read_time,
- .set_time = armada38x_rtc_set_time,
- .read_alarm = armada38x_rtc_read_alarm,
- .read_offset = armada38x_rtc_read_offset,
- .set_offset = armada38x_rtc_set_offset,
-};
-
static const struct armada38x_rtc_data armada38x_data = {
.update_mbus_timing = rtc_update_38x_mbus_timing_params,
.read_rtc_reg = read_rtc_register_38x_wa,
@@ -540,20 +532,15 @@ static __init int armada38x_rtc_probe(struct platform_device *pdev)
}
platform_set_drvdata(pdev, rtc);
- if (rtc->irq != -1) {
+ if (rtc->irq != -1)
device_init_wakeup(&pdev->dev, 1);
- rtc->rtc_dev->ops = &armada38x_rtc_ops;
- } else {
- /*
- * If there is no interrupt available then we can't
- * use the alarm
- */
- rtc->rtc_dev->ops = &armada38x_rtc_ops_noirq;
- }
+ else
+ clear_bit(RTC_FEATURE_ALARM, rtc->rtc_dev->features);
/* Update RTC-MBUS bridge timing parameters */
rtc->data->update_mbus_timing(rtc);
+ rtc->rtc_dev->ops = &armada38x_rtc_ops;
rtc->rtc_dev->range_max = U32_MAX;
return devm_rtc_register_device(rtc->rtc_dev);
--
2.29.2
^ permalink raw reply related
* [PATCH 01/17] rtc: introduce features bitfield
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Introduce a bitfield to allow the drivers to announce the available
features for an RTC.
The main use case would be to better handle alarms, that could be present
or not or have a minute resolution or may need a correct week day to be set.
Use the newly introduced RTC_FEATURE_ALARM bit to then test whether alarms
are available instead of relying on the presence of ops->set_alarm.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/class.c | 5 +++++
drivers/rtc/interface.c | 12 ++++++------
include/linux/rtc.h | 2 ++
include/uapi/linux/rtc.h | 5 +++++
4 files changed, 18 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index 7e470fbd5e4d..03abd0aa229a 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -231,6 +231,8 @@ static struct rtc_device *rtc_allocate_device(void)
rtc->pie_timer.function = rtc_pie_update_irq;
rtc->pie_enabled = 0;
+ set_bit(RTC_FEATURE_ALARM, rtc->features);
+
return rtc;
}
@@ -386,6 +388,9 @@ int __devm_rtc_register_device(struct module *owner, struct rtc_device *rtc)
return -EINVAL;
}
+ if (!rtc->ops->set_alarm)
+ clear_bit(RTC_FEATURE_ALARM, rtc->features);
+
rtc->owner = owner;
rtc_device_get_offset(rtc);
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 794a4f036b99..dcb34c73319e 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -186,7 +186,7 @@ static int rtc_read_alarm_internal(struct rtc_device *rtc,
if (!rtc->ops) {
err = -ENODEV;
- } else if (!rtc->ops->read_alarm) {
+ } else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
err = -EINVAL;
} else {
alarm->enabled = 0;
@@ -392,7 +392,7 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
return err;
if (!rtc->ops) {
err = -ENODEV;
- } else if (!rtc->ops->read_alarm) {
+ } else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->read_alarm) {
err = -EINVAL;
} else {
memset(alarm, 0, sizeof(struct rtc_wkalrm));
@@ -436,7 +436,7 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (!rtc->ops)
err = -ENODEV;
- else if (!rtc->ops->set_alarm)
+ else if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
err = -EINVAL;
else
err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
@@ -451,7 +451,7 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
if (!rtc->ops)
return -ENODEV;
- else if (!rtc->ops->set_alarm)
+ else if (!test_bit(RTC_FEATURE_ALARM, rtc->features))
return -EINVAL;
err = rtc_valid_tm(&alarm->time);
@@ -531,7 +531,7 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled)
/* nothing */;
else if (!rtc->ops)
err = -ENODEV;
- else if (!rtc->ops->alarm_irq_enable)
+ else if (!test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->alarm_irq_enable)
err = -EINVAL;
else
err = rtc->ops->alarm_irq_enable(rtc->dev.parent, enabled);
@@ -843,7 +843,7 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
static void rtc_alarm_disable(struct rtc_device *rtc)
{
- if (!rtc->ops || !rtc->ops->alarm_irq_enable)
+ if (!rtc->ops || !test_bit(RTC_FEATURE_ALARM, rtc->features) || !rtc->ops->alarm_irq_enable)
return;
rtc->ops->alarm_irq_enable(rtc->dev.parent, false);
diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 568909449c13..bd611e26291d 100644
--- a/include/linux/rtc.h
+++ b/include/linux/rtc.h
@@ -141,6 +141,8 @@ struct rtc_device {
*/
unsigned long set_offset_nsec;
+ unsigned long features[BITS_TO_LONGS(RTC_FEATURE_CNT)];
+
time64_t range_min;
timeu64_t range_max;
time64_t start_secs;
diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h
index fa9aff91cbf2..f950bff75e97 100644
--- a/include/uapi/linux/rtc.h
+++ b/include/uapi/linux/rtc.h
@@ -110,6 +110,11 @@ struct rtc_pll_info {
#define RTC_AF 0x20 /* Alarm interrupt */
#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
+/* feature list */
+#define RTC_FEATURE_ALARM 0
+#define RTC_FEATURE_ALARM_RES_MINUTE 1
+#define RTC_FEATURE_NEED_WEEK_DAY 2
+#define RTC_FEATURE_CNT 3
#define RTC_MAX_FREQ 8192
--
2.29.2
^ permalink raw reply related
* [PATCH 00/17] rtc: constify all rtc_class_ops
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc; +Cc: Alexandre Belloni, linuxppc-dev, linux-kernel, linux-arm-kernel
Hello,
This first introduces a features bitfield that is used to handle the
presence or absence of alarms instead of relying only on the presence of
the alarm callbacks.
The drivers modifying a struct rtc_class_ops or using two different
structures are then converted.
Alexandre Belloni (17):
rtc: introduce features bitfield
rtc: pl031: use RTC_FEATURE_ALARM
rtc: armada38x: remove armada38x_rtc_ops_noirq
rtc: cmos: remove cmos_rtc_ops_no_alarm
rtc: mv: remove mv_rtc_alarm_ops
rtc: m48t59: remove m48t02_rtc_ops
rtc: pcf2127: remove pcf2127_rtc_alrm_ops
rtc: pcf85063: remove pcf85063_rtc_ops_alarm
rtc: rx8010: drop a struct rtc_class_ops
rtc: pcf85363: drop a struct rtc_class_ops
rtc: m41t80: constify m41t80_rtc_ops
rtc: opal: constify opal_rtc_ops
rtc: rv3028: constify rv3028_rtc_ops
rtc: rv3029: constify rv3029_rtc_ops
rtc: rv3032: constify rv3032_rtc_ops
rtc: rv8803: constify rv8803_rtc_ops
rtc: tps65910: remove tps65910_rtc_ops_noirq
drivers/rtc/class.c | 5 +++++
drivers/rtc/interface.c | 12 ++++++------
drivers/rtc/rtc-armada38x.c | 21 ++++-----------------
drivers/rtc/rtc-cmos.c | 12 +++---------
drivers/rtc/rtc-m41t80.c | 14 +++++++-------
drivers/rtc/rtc-m48t59.c | 22 ++++++++--------------
drivers/rtc/rtc-mv.c | 14 ++++----------
drivers/rtc/rtc-opal.c | 13 +++++++------
drivers/rtc/rtc-pcf2127.c | 11 +++--------
drivers/rtc/rtc-pcf85063.c | 11 ++---------
drivers/rtc/rtc-pcf85363.c | 8 ++------
drivers/rtc/rtc-pl031.c | 8 ++------
drivers/rtc/rtc-rv3028.c | 11 ++++++-----
drivers/rtc/rtc-rv3029c2.c | 11 ++++++-----
drivers/rtc/rtc-rv3032.c | 11 ++++++-----
drivers/rtc/rtc-rv8803.c | 11 ++++++-----
drivers/rtc/rtc-rx8010.c | 13 +++----------
drivers/rtc/rtc-tps65910.c | 15 ++++-----------
include/linux/rtc.h | 2 ++
include/uapi/linux/rtc.h | 5 +++++
20 files changed, 91 insertions(+), 139 deletions(-)
--
2.29.2
^ permalink raw reply
* [PATCH 02/17] rtc: pl031: use RTC_FEATURE_ALARM
From: Alexandre Belloni @ 2021-01-10 23:17 UTC (permalink / raw)
To: linux-rtc, Linus Walleij, Alessandro Zummo, Alexandre Belloni
Cc: linuxppc-dev, linux-kernel, linux-arm-kernel
In-Reply-To: <20210110231752.1418816-1-alexandre.belloni@bootlin.com>
Clear RTC_FEATURE_ALARM instead of setting set_alarm, read_alarm and
alarm_irq_enable to NULL.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-pl031.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
index 224bbf096262..7c3967df4f9a 100644
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -352,12 +352,8 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
}
}
- if (!adev->irq[0]) {
- /* When there's no interrupt, no point in exposing the alarm */
- ops->read_alarm = NULL;
- ops->set_alarm = NULL;
- ops->alarm_irq_enable = NULL;
- }
+ if (!adev->irq[0])
+ clear_bit(RTC_FEATURE_ALARM, ldata->rtc->features);
device_init_wakeup(&adev->dev, true);
ldata->rtc = devm_rtc_allocate_device(&adev->dev);
--
2.29.2
^ permalink raw reply related
* [PATCH] rtc: opal: set range
From: Alexandre Belloni @ 2021-01-10 22:46 UTC (permalink / raw)
To: Michael Ellerman, Benjamin Herrenschmidt, Paul Mackerras,
Alessandro Zummo, Alexandre Belloni
Cc: linux-rtc, linuxppc-dev, linux-kernel
It is a BCD RTC with 4 digits for the year.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/rtc-opal.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/rtc/rtc-opal.c b/drivers/rtc/rtc-opal.c
index 7b9f8bcf86fe..c586f695bdc9 100644
--- a/drivers/rtc/rtc-opal.c
+++ b/drivers/rtc/rtc-opal.c
@@ -233,6 +233,10 @@ static int opal_rtc_probe(struct platform_device *pdev)
{
struct rtc_device *rtc;
+ rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(rtc))
+ return PTR_ERR(rtc);
+
if (pdev->dev.of_node &&
(of_property_read_bool(pdev->dev.of_node, "wakeup-source") ||
of_property_read_bool(pdev->dev.of_node, "has-tpo")/* legacy */)) {
@@ -242,14 +246,12 @@ static int opal_rtc_probe(struct platform_device *pdev)
opal_rtc_ops.alarm_irq_enable = opal_tpo_alarm_irq_enable;
}
- rtc = devm_rtc_device_register(&pdev->dev, DRVNAME, &opal_rtc_ops,
- THIS_MODULE);
- if (IS_ERR(rtc))
- return PTR_ERR(rtc);
-
+ rtc->ops = &opal_rtc_ops;
+ rtc->range_min = RTC_TIMESTAMP_BEGIN_0000;
+ rtc->range_max = RTC_TIMESTAMP_END_9999;
rtc->uie_unsupported = 1;
- return 0;
+ return devm_rtc_register_device(rtc);
}
static const struct of_device_id opal_rtc_match[] = {
--
2.29.2
^ permalink raw reply related
* Re: [GIT PULL] Please pull powerpc/linux.git powerpc-5.11-3 tag
From: pr-tracker-bot @ 2021-01-10 20:07 UTC (permalink / raw)
To: Michael Ellerman
Cc: linuxppc-dev, natechancellor, Linus Torvalds, linux-kernel
In-Reply-To: <87y2h1j6k9.fsf@mpe.ellerman.id.au>
The pull request you sent on Sun, 10 Jan 2021 23:54:30 +1100:
> https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git tags/powerpc-5.11-3
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/b3cd1a16cc8829776523fcd114299373be4e5187
Thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/prtracker.html
^ permalink raw reply
* [GIT PULL] Please pull powerpc/linux.git powerpc-5.11-3 tag
From: Michael Ellerman @ 2021-01-10 12:54 UTC (permalink / raw)
To: Linus Torvalds; +Cc: natechancellor, linuxppc-dev, linux-kernel
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Hi Linus,
Please pull a couple of powerpc fixes for 5.11:
The following changes since commit e71ba9452f0b5b2e8dc8aa5445198cd9214a6a62:
Linux 5.11-rc2 (2021-01-03 15:55:30 -0800)
are available in the git repository at:
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git tags/powerpc-5.11-3
for you to fetch changes up to 3ce47d95b7346dcafd9bed3556a8d072cb2b8571:
powerpc: Handle .text.{hot,unlikely}.* in linker script (2021-01-06 21:59:04 +1100)
- ------------------------------------------------------------------
powerpc fixes for 5.11 #3
A fix for machine check handling with VMAP stack on 32-bit.
A clang build fix.
Thanks to:
Christophe Leroy, Nathan Chancellor.
- ------------------------------------------------------------------
Christophe Leroy (1):
powerpc/32s: Fix RTAS machine check with VMAP stack
Nathan Chancellor (1):
powerpc: Handle .text.{hot,unlikely}.* in linker script
arch/powerpc/kernel/head_book3s_32.S | 9 +++++++++
arch/powerpc/kernel/vmlinux.lds.S | 2 +-
2 files changed, 10 insertions(+), 1 deletion(-)
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^ permalink raw reply
* Re: [patch V3 13/37] mips/mm/highmem: Switch to generic kmap atomic
From: H. Nikolaus Schaller @ 2021-01-10 11:53 UTC (permalink / raw)
To: Paul Cercueil
Cc: juri.lelli, linux-aio, airlied, nouveau, bigeasy, ML dri-devel,
linux-mips, bsegall, clm, ray.huang, paulus, kraxel, sparclinux,
deanbo422, hch, vincent.guittot, paulmck, x86, linux, linux-csky,
mingo, peterz, linux-graphics-maintainer, bskeggs, airlied,
linux-snps-arc, linux-mm, mgorman, linux-xtensa, arnd, intel-gfx,
sroland, josef, rostedt, torvalds, green.hu, rodrigo.vivi,
dsterba, tglx, virtualization, dietmar.eggemann, linux-arm-kernel,
chris, monstr, Thomas Bogendoerfer, nickhu, jcmvbkbc,
linuxppc-dev, Linux Kernel Mailing List, christian.koenig, bcrl,
spice-devel, vgupta, linux-fsdevel, akpm, bristot, davem,
linux-btrfs, viro
In-Reply-To: <DUUPMQ.U53A0W7YJPGM@crapouillou.net>
> Am 10.01.2021 um 12:35 schrieb Paul Cercueil <paul@crapouillou.net>:
>
> Hi Thomas,
>
> Le sam. 9 janv. 2021 à 1:33, Thomas Bogendoerfer <tsbogend@alpha.franken.de> a écrit :
>> On Sat, Jan 09, 2021 at 12:58:05AM +0100, Thomas Bogendoerfer wrote:
>>> On Fri, Jan 08, 2021 at 08:20:43PM +0000, Paul Cercueil wrote:
>>> > Hi Thomas,
>>> >
>>> > 5.11 does not boot anymore on Ingenic SoCs, I bisected it to this commit.
Just for completeness, I have no such problems booting CI20/jz4780 or Skytone400/jz4730 (unpublished work) with 5.11-rc2.
But may depend on board capabilites (ram size, memory layout or something else).
>>> >
>>> > Any idea what could be happening?
>>> not yet, kernel crash log of a Malta QEMU is below.
>> update:
>> This dirty hack lets the Malta QEMU boot again:
>> diff --git a/mm/highmem.c b/mm/highmem.c
>> index c3a9ea7875ef..190cdda1149d 100644
>> --- a/mm/highmem.c
>> +++ b/mm/highmem.c
>> @@ -515,7 +515,7 @@ void *__kmap_local_pfn_prot(unsigned long pfn, pgprot_t prot)
>> vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
>> BUG_ON(!pte_none(*(kmap_pte - idx)));
>> pteval = pfn_pte(pfn, prot);
>> - set_pte_at(&init_mm, vaddr, kmap_pte - idx, pteval);
>> + set_pte(kmap_pte - idx, pteval);
>> arch_kmap_local_post_map(vaddr, pteval);
>> current->kmap_ctrl.pteval[kmap_local_idx()] = pteval;
>> preempt_enable();
>> set_pte_at() tries to update cache and could do an kmap_atomic() there.
>> Not sure, if this is allowed at this point.
>
> Yes, I can confirm that your workaround works here too.
>
> Cheers,
> -Paul
>
>
^ permalink raw reply
* Re: [patch V3 13/37] mips/mm/highmem: Switch to generic kmap atomic
From: Paul Cercueil @ 2021-01-10 11:35 UTC (permalink / raw)
To: Thomas Bogendoerfer
Cc: juri.lelli, linux-aio, airlied, nouveau, bigeasy, dri-devel,
linux-mips, bsegall, jcmvbkbc, ray.huang, paulus, kraxel,
sparclinux, deanbo422, hch, vincent.guittot, paulmck, x86, linux,
linux-csky, mingo, peterz, linux-graphics-maintainer, bskeggs,
airlied, linux-snps-arc, linux-mm, mgorman, linux-xtensa, arnd,
intel-gfx, sroland, josef, rostedt, torvalds, green.hu,
rodrigo.vivi, dsterba, tglx, virtualization, dietmar.eggemann,
linux-arm-kernel, chris, monstr, nickhu, clm, linuxppc-dev,
linux-kernel, christian.koenig, bcrl, spice-devel, vgupta,
linux-fsdevel, akpm, bristot, davem, linux-btrfs, viro
In-Reply-To: <20210109003352.GA18102@alpha.franken.de>
Hi Thomas,
Le sam. 9 janv. 2021 à 1:33, Thomas Bogendoerfer
<tsbogend@alpha.franken.de> a écrit :
> On Sat, Jan 09, 2021 at 12:58:05AM +0100, Thomas Bogendoerfer wrote:
>> On Fri, Jan 08, 2021 at 08:20:43PM +0000, Paul Cercueil wrote:
>> > Hi Thomas,
>> >
>> > 5.11 does not boot anymore on Ingenic SoCs, I bisected it to this
>> commit.
>> >
>> > Any idea what could be happening?
>>
>> not yet, kernel crash log of a Malta QEMU is below.
>
> update:
>
> This dirty hack lets the Malta QEMU boot again:
>
> diff --git a/mm/highmem.c b/mm/highmem.c
> index c3a9ea7875ef..190cdda1149d 100644
> --- a/mm/highmem.c
> +++ b/mm/highmem.c
> @@ -515,7 +515,7 @@ void *__kmap_local_pfn_prot(unsigned long pfn,
> pgprot_t prot)
> vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
> BUG_ON(!pte_none(*(kmap_pte - idx)));
> pteval = pfn_pte(pfn, prot);
> - set_pte_at(&init_mm, vaddr, kmap_pte - idx, pteval);
> + set_pte(kmap_pte - idx, pteval);
> arch_kmap_local_post_map(vaddr, pteval);
> current->kmap_ctrl.pteval[kmap_local_idx()] = pteval;
> preempt_enable();
>
> set_pte_at() tries to update cache and could do an kmap_atomic()
> there.
> Not sure, if this is allowed at this point.
Yes, I can confirm that your workaround works here too.
Cheers,
-Paul
^ permalink raw reply
* [PATCH v3 3/8] powerpc/signal64: Move non-inline functions out of setup_sigcontext()
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
There are non-inline functions which get called in setup_sigcontext() to
save register state to the thread struct. Move these functions into a
separate prepare_setup_sigcontext() function so that
setup_sigcontext() can be refactored later into an "unsafe" version
which assumes an open uaccess window. Non-inline functions should be
avoided when uaccess is open.
The majority of setup_sigcontext() can be refactored to execute in an
"unsafe" context (uaccess window is opened) except for some non-inline
functions. Move these out into a separate prepare_setup_sigcontext()
function which must be called first and before opening up a uaccess
window. A follow-up commit converts setup_sigcontext() to be "unsafe".
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal_64.c | 32 +++++++++++++++++++++-----------
1 file changed, 21 insertions(+), 11 deletions(-)
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index f9e4a1ac440f..b211a8ea4f6e 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -79,6 +79,24 @@ static elf_vrreg_t __user *sigcontext_vmx_regs(struct sigcontext __user *sc)
}
#endif
+static void prepare_setup_sigcontext(struct task_struct *tsk, int ctx_has_vsx_region)
+{
+#ifdef CONFIG_ALTIVEC
+ /* save altivec registers */
+ if (tsk->thread.used_vr)
+ flush_altivec_to_thread(tsk);
+ if (cpu_has_feature(CPU_FTR_ALTIVEC))
+ tsk->thread.vrsave = mfspr(SPRN_VRSAVE);
+#endif /* CONFIG_ALTIVEC */
+
+ flush_fp_to_thread(tsk);
+
+#ifdef CONFIG_VSX
+ if (tsk->thread.used_vsr && ctx_has_vsx_region)
+ flush_vsx_to_thread(tsk);
+#endif /* CONFIG_VSX */
+}
+
/*
* Set up the sigcontext for the signal frame.
*/
@@ -97,7 +115,6 @@ static long setup_sigcontext(struct sigcontext __user *sc,
*/
#ifdef CONFIG_ALTIVEC
elf_vrreg_t __user *v_regs = sigcontext_vmx_regs(sc);
- unsigned long vrsave;
#endif
struct pt_regs *regs = tsk->thread.regs;
unsigned long msr = regs->msr;
@@ -112,7 +129,6 @@ static long setup_sigcontext(struct sigcontext __user *sc,
/* save altivec registers */
if (tsk->thread.used_vr) {
- flush_altivec_to_thread(tsk);
/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
err |= __copy_to_user(v_regs, &tsk->thread.vr_state,
33 * sizeof(vector128));
@@ -124,17 +140,10 @@ static long setup_sigcontext(struct sigcontext __user *sc,
/* We always copy to/from vrsave, it's 0 if we don't have or don't
* use altivec.
*/
- vrsave = 0;
- if (cpu_has_feature(CPU_FTR_ALTIVEC)) {
- vrsave = mfspr(SPRN_VRSAVE);
- tsk->thread.vrsave = vrsave;
- }
-
- err |= __put_user(vrsave, (u32 __user *)&v_regs[33]);
+ err |= __put_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33]);
#else /* CONFIG_ALTIVEC */
err |= __put_user(0, &sc->v_regs);
#endif /* CONFIG_ALTIVEC */
- flush_fp_to_thread(tsk);
/* copy fpr regs and fpscr */
err |= copy_fpr_to_user(&sc->fp_regs, tsk);
@@ -150,7 +159,6 @@ static long setup_sigcontext(struct sigcontext __user *sc,
* VMX data.
*/
if (tsk->thread.used_vsr && ctx_has_vsx_region) {
- flush_vsx_to_thread(tsk);
v_regs += ELF_NVRREG;
err |= copy_vsx_to_user(v_regs, tsk);
/* set MSR_VSX in the MSR value in the frame to
@@ -655,6 +663,7 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
ctx_has_vsx_region = 1;
if (old_ctx != NULL) {
+ prepare_setup_sigcontext(current, ctx_has_vsx_region);
if (!access_ok(old_ctx, ctx_size)
|| setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL, 0,
ctx_has_vsx_region)
@@ -842,6 +851,7 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
#endif
{
err |= __put_user(0, &frame->uc.uc_link);
+ prepare_setup_sigcontext(tsk, 1);
err |= setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig,
NULL, (unsigned long)ksig->ka.sa.sa_handler,
1);
--
2.26.1
^ permalink raw reply related
* [PATCH v3 0/8] Improve signal performance on PPC64 with KUAP
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
As reported by Anton, there is a large penalty to signal handling
performance on radix systems using KUAP. The signal handling code
performs many user access operations, each of which needs to switch the
KUAP permissions bit to open and then close user access. This involves a
costly 'mtspr' operation [0].
There is existing work done on x86 and by Christopher Leroy for PPC32 to
instead open up user access in "blocks" using user_*_access_{begin,end}.
We can do the same in PPC64 to bring performance back up on KUAP-enabled
radix and now also hash MMU systems [1].
Hash MMU KUAP support along with uaccess flush has landed in linuxppc/next
since the last revision. This series also provides a large benefit on hash
with KUAP. However, in the hash implementation of KUAP the user AMR is
always restored during system_call_exception() which cannot be avoided.
Fewer user access switches naturally also result in less uaccess flushing.
The first two patches add some needed 'unsafe' versions of copy-from
functions. While these do not make use of asm-goto they still allow for
avoiding the repeated uaccess switches.
The third patch moves functions called by setup_sigcontext() into a new
prepare_setup_sigcontext() to simplify converting setup_sigcontext()
into an 'unsafe' version which assumes an open uaccess window later.
The fourth patch cleans-up some of the Transactional Memory ifdef stuff
to simplify using uaccess blocks later.
The next two patches rewrite some of the signal64 helper functions to
be 'unsafe'. Finally, the last two patches update the main signal
handling functions to make use of the new 'unsafe' helpers and eliminate
some additional uaccess switching.
I used the will-it-scale signal1 benchmark to measure and compare
performance [2]. The below results are from running a minimal
kernel+initramfs QEMU/KVM guest on a POWER9 Blackbird:
signal1_threads -t1 -s10
| | hash | radix |
| --------------------------- | ------ | ------ |
| linuxppc/next | 118693 | 133296 |
| linuxppc/next w/o KUAP+KUEP | 228911 | 228654 |
| unsafe-signal64 | 200480 | 234067 |
There were questions previously about the unsafe_copy_from_user() and
unsafe_copy_{vsx,fpr}_from_user() implementations in the first two
patches of this series [3][4]. The two results below show the performance
degradations when using the proposed alternate implementations:
| unsafe-signal64-regs | 178688 | 201128 |
| unsafe-signal64-copy | 147443 | 165759 |
Full trees with the two alternate implementations are available [5][6].
[0]: https://github.com/linuxppc/issues/issues/277
[1]: https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=196278
[2]: https://github.com/antonblanchard/will-it-scale/blob/master/tests/signal1.c
[3]: https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-October/219355.html
[4]: https://lists.ozlabs.org/pipermail/linuxppc-dev/2020-October/219351.html
[5]: https://git.sr.ht/~cmr/linux/tree/unsafe-signal64-v3-regs
[6]: https://git.sr.ht/~cmr/linux/tree/unsafe-signal64-v3-copy
v3: * Rebase on latest linuxppc/next
* Reword confusing commit messages
* Add missing comma in macro in signal.h which broke compiles without
CONFIG_ALTIVEC
* Validate hash KUAP signal performance improvements
v2: * Rebase on latest linuxppc/next + Christophe Leroy's PPC32
signal series
* Simplify/remove TM ifdefery similar to PPC32 series and clean
up the uaccess begin/end calls
* Isolate non-inline functions so they are not called when
uaccess window is open
Christopher M. Riedl (6):
powerpc/uaccess: Add unsafe_copy_from_user
powerpc/signal: Add unsafe_copy_{vsx,fpr}_from_user()
powerpc/signal64: Move non-inline functions out of setup_sigcontext()
powerpc/signal64: Remove TM ifdefery in middle of if/else block
powerpc/signal64: Replace setup_sigcontext() w/
unsafe_setup_sigcontext()
powerpc/signal64: Replace restore_sigcontext() w/
unsafe_restore_sigcontext()
Daniel Axtens (2):
powerpc/signal64: Rewrite handle_rt_signal64() to minimise uaccess
switches
powerpc/signal64: Rewrite rt_sigreturn() to minimise uaccess switches
arch/powerpc/include/asm/uaccess.h | 28 ++--
arch/powerpc/kernel/signal.h | 33 ++++
arch/powerpc/kernel/signal_64.c | 237 ++++++++++++++++++-----------
3 files changed, 198 insertions(+), 100 deletions(-)
--
2.26.1
^ permalink raw reply
* [PATCH v3 8/8] powerpc/signal64: Rewrite rt_sigreturn() to minimise uaccess switches
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Daniel Axtens
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
From: Daniel Axtens <dja@axtens.net>
Add uaccess blocks and use the 'unsafe' versions of functions doing user
access where possible to reduce the number of times uaccess has to be
opened/closed.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Co-developed-by: Christopher M. Riedl <cmr@codefail.de>
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal_64.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 7e62d62ef482..1b1e39663999 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -784,8 +784,11 @@ SYSCALL_DEFINE0(rt_sigreturn)
regs->msr &= ~MSR_TS_MASK;
#endif
- if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
+ if (!user_read_access_begin(uc, sizeof(*uc)))
goto badframe;
+
+ unsafe_get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR], badframe_block);
+
if (MSR_TM_ACTIVE(msr)) {
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/* We recheckpoint on return. */
@@ -793,10 +796,12 @@ SYSCALL_DEFINE0(rt_sigreturn)
/* Trying to start TM on non TM system */
if (!cpu_has_feature(CPU_FTR_TM))
- goto badframe;
+ goto badframe_block;
+
+ unsafe_get_user(uc_transact, &uc->uc_link, badframe_block);
+
+ user_read_access_end();
- if (__get_user(uc_transact, &uc->uc_link))
- goto badframe;
if (restore_tm_sigcontexts(current, &uc->uc_mcontext,
&uc_transact->uc_mcontext))
goto badframe;
@@ -815,12 +820,9 @@ SYSCALL_DEFINE0(rt_sigreturn)
* causing a TM bad thing.
*/
current->thread.regs->msr &= ~MSR_TS_MASK;
- if (!user_read_access_begin(uc, sizeof(*uc)))
- return -EFAULT;
- if (__unsafe_restore_sigcontext(current, NULL, 1, &uc->uc_mcontext)) {
- user_read_access_end();
- goto badframe;
- }
+ unsafe_restore_sigcontext(current, NULL, 1, &uc->uc_mcontext,
+ badframe_block);
+
user_read_access_end();
}
@@ -830,6 +832,8 @@ SYSCALL_DEFINE0(rt_sigreturn)
set_thread_flag(TIF_RESTOREALL);
return 0;
+badframe_block:
+ user_read_access_end();
badframe:
signal_fault(current, regs, "rt_sigreturn", uc);
--
2.26.1
^ permalink raw reply related
* [PATCH v3 4/8] powerpc/signal64: Remove TM ifdefery in middle of if/else block
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
Rework the messy ifdef breaking up the if-else for TM similar to
commit f1cf4f93de2f ("powerpc/signal32: Remove ifdefery in middle of if/else").
Unlike that commit for ppc32, the ifdef can't be removed entirely since
uc_transact in sigframe depends on CONFIG_PPC_TRANSACTIONAL_MEM.
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal_64.c | 17 +++++++----------
1 file changed, 7 insertions(+), 10 deletions(-)
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index b211a8ea4f6e..dd3787f67a78 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -710,9 +710,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
struct pt_regs *regs = current_pt_regs();
struct ucontext __user *uc = (struct ucontext __user *)regs->gpr[1];
sigset_t set;
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
unsigned long msr;
-#endif
/* Always make any pending restarted system calls return -EINTR */
current->restart_block.fn = do_no_restart_syscall;
@@ -762,10 +760,12 @@ SYSCALL_DEFINE0(rt_sigreturn)
* restore_tm_sigcontexts.
*/
regs->msr &= ~MSR_TS_MASK;
+#endif
if (__get_user(msr, &uc->uc_mcontext.gp_regs[PT_MSR]))
goto badframe;
if (MSR_TM_ACTIVE(msr)) {
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/* We recheckpoint on return. */
struct ucontext __user *uc_transact;
@@ -778,9 +778,8 @@ SYSCALL_DEFINE0(rt_sigreturn)
if (restore_tm_sigcontexts(current, &uc->uc_mcontext,
&uc_transact->uc_mcontext))
goto badframe;
- } else
#endif
- {
+ } else {
/*
* Fall through, for non-TM restore
*
@@ -818,10 +817,8 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
unsigned long newsp = 0;
long err = 0;
struct pt_regs *regs = tsk->thread.regs;
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/* Save the thread's msr before get_tm_stackpointer() changes it */
- unsigned long msr = regs->msr;
-#endif
+ unsigned long msr __maybe_unused = regs->msr;
frame = get_sigframe(ksig, tsk, sizeof(*frame), 0);
if (!access_ok(frame, sizeof(*frame)))
@@ -836,8 +833,9 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
/* Create the ucontext. */
err |= __put_user(0, &frame->uc.uc_flags);
err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+
if (MSR_TM_ACTIVE(msr)) {
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/* The ucontext_t passed to userland points to the second
* ucontext_t (for transactional state) with its uc_link ptr.
*/
@@ -847,9 +845,8 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
tsk, ksig->sig, NULL,
(unsigned long)ksig->ka.sa.sa_handler,
msr);
- } else
#endif
- {
+ } else {
err |= __put_user(0, &frame->uc.uc_link);
prepare_setup_sigcontext(tsk, 1);
err |= setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig,
--
2.26.1
^ permalink raw reply related
* [PATCH v3 2/8] powerpc/signal: Add unsafe_copy_{vsx,fpr}_from_user()
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
Reuse the "safe" implementation from signal.c except for calling
unsafe_copy_from_user() to copy into a local buffer.
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal.h | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/arch/powerpc/kernel/signal.h b/arch/powerpc/kernel/signal.h
index 2559a681536e..c18402d625f1 100644
--- a/arch/powerpc/kernel/signal.h
+++ b/arch/powerpc/kernel/signal.h
@@ -53,6 +53,33 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
&buf[i], label);\
} while (0)
+#define unsafe_copy_fpr_from_user(task, from, label) do { \
+ struct task_struct *__t = task; \
+ u64 __user *__f = (u64 __user *)from; \
+ u64 buf[ELF_NFPREG]; \
+ int i; \
+ \
+ unsafe_copy_from_user(buf, __f, ELF_NFPREG * sizeof(double), \
+ label); \
+ for (i = 0; i < ELF_NFPREG - 1; i++) \
+ __t->thread.TS_FPR(i) = buf[i]; \
+ __t->thread.fp_state.fpscr = buf[i]; \
+} while (0)
+
+#define unsafe_copy_vsx_from_user(task, from, label) do { \
+ struct task_struct *__t = task; \
+ u64 __user *__f = (u64 __user *)from; \
+ u64 buf[ELF_NVSRHALFREG]; \
+ int i; \
+ \
+ unsafe_copy_from_user(buf, __f, \
+ ELF_NVSRHALFREG * sizeof(double), \
+ label); \
+ for (i = 0; i < ELF_NVSRHALFREG ; i++) \
+ __t->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = buf[i]; \
+} while (0)
+
+
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
#define unsafe_copy_ckfpr_to_user(to, task, label) do { \
struct task_struct *__t = task; \
@@ -80,6 +107,10 @@ unsigned long copy_ckfpr_from_user(struct task_struct *task, void __user *from);
unsafe_copy_to_user(to, (task)->thread.fp_state.fpr, \
ELF_NFPREG * sizeof(double), label)
+#define unsafe_copy_fpr_from_user(task, from, label) \
+ unsafe_copy_from_user((task)->thread.fp_state.fpr, from, \
+ ELF_NFPREG * sizeof(double), label)
+
static inline unsigned long
copy_fpr_to_user(void __user *to, struct task_struct *task)
{
@@ -115,6 +146,8 @@ copy_ckfpr_from_user(struct task_struct *task, void __user *from)
#else
#define unsafe_copy_fpr_to_user(to, task, label) do { } while (0)
+#define unsafe_copy_fpr_from_user(task, from, label) do { } while (0)
+
static inline unsigned long
copy_fpr_to_user(void __user *to, struct task_struct *task)
{
--
2.26.1
^ permalink raw reply related
* [PATCH v3 6/8] powerpc/signal64: Replace restore_sigcontext() w/ unsafe_restore_sigcontext()
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
Previously restore_sigcontext() performed a costly KUAP switch on every
uaccess operation. These repeated uaccess switches cause a significant
drop in signal handling performance.
Rewrite restore_sigcontext() to assume that a userspace read access
window is open. Replace all uaccess functions with their 'unsafe'
versions which avoid the repeated uaccess switches.
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal_64.c | 68 ++++++++++++++++++++-------------
1 file changed, 41 insertions(+), 27 deletions(-)
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index fd3c1ab9a1ea..0c7f633b832b 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -326,14 +326,14 @@ static long setup_tm_sigcontexts(struct sigcontext __user *sc,
/*
* Restore the sigcontext from the signal frame.
*/
-
-static long restore_sigcontext(struct task_struct *tsk, sigset_t *set, int sig,
- struct sigcontext __user *sc)
+#define unsafe_restore_sigcontext(tsk, set, sig, sc, e) \
+ unsafe_op_wrap(__unsafe_restore_sigcontext(tsk, set, sig, sc), e)
+static long notrace __unsafe_restore_sigcontext(struct task_struct *tsk, sigset_t *set,
+ int sig, struct sigcontext __user *sc)
{
#ifdef CONFIG_ALTIVEC
elf_vrreg_t __user *v_regs;
#endif
- unsigned long err = 0;
unsigned long save_r13 = 0;
unsigned long msr;
struct pt_regs *regs = tsk->thread.regs;
@@ -348,27 +348,28 @@ static long restore_sigcontext(struct task_struct *tsk, sigset_t *set, int sig,
save_r13 = regs->gpr[13];
/* copy the GPRs */
- err |= __copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr));
- err |= __get_user(regs->nip, &sc->gp_regs[PT_NIP]);
+ unsafe_copy_from_user(regs->gpr, sc->gp_regs, sizeof(regs->gpr),
+ efault_out);
+ unsafe_get_user(regs->nip, &sc->gp_regs[PT_NIP], efault_out);
/* get MSR separately, transfer the LE bit if doing signal return */
- err |= __get_user(msr, &sc->gp_regs[PT_MSR]);
+ unsafe_get_user(msr, &sc->gp_regs[PT_MSR], efault_out);
if (sig)
regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);
- err |= __get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3]);
- err |= __get_user(regs->ctr, &sc->gp_regs[PT_CTR]);
- err |= __get_user(regs->link, &sc->gp_regs[PT_LNK]);
- err |= __get_user(regs->xer, &sc->gp_regs[PT_XER]);
- err |= __get_user(regs->ccr, &sc->gp_regs[PT_CCR]);
+ unsafe_get_user(regs->orig_gpr3, &sc->gp_regs[PT_ORIG_R3], efault_out);
+ unsafe_get_user(regs->ctr, &sc->gp_regs[PT_CTR], efault_out);
+ unsafe_get_user(regs->link, &sc->gp_regs[PT_LNK], efault_out);
+ unsafe_get_user(regs->xer, &sc->gp_regs[PT_XER], efault_out);
+ unsafe_get_user(regs->ccr, &sc->gp_regs[PT_CCR], efault_out);
/* Don't allow userspace to set SOFTE */
set_trap_norestart(regs);
- err |= __get_user(regs->dar, &sc->gp_regs[PT_DAR]);
- err |= __get_user(regs->dsisr, &sc->gp_regs[PT_DSISR]);
- err |= __get_user(regs->result, &sc->gp_regs[PT_RESULT]);
+ unsafe_get_user(regs->dar, &sc->gp_regs[PT_DAR], efault_out);
+ unsafe_get_user(regs->dsisr, &sc->gp_regs[PT_DSISR], efault_out);
+ unsafe_get_user(regs->result, &sc->gp_regs[PT_RESULT], efault_out);
if (!sig)
regs->gpr[13] = save_r13;
if (set != NULL)
- err |= __get_user(set->sig[0], &sc->oldmask);
+ unsafe_get_user(set->sig[0], &sc->oldmask, efault_out);
/*
* Force reload of FP/VEC.
@@ -378,29 +379,28 @@ static long restore_sigcontext(struct task_struct *tsk, sigset_t *set, int sig,
regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1 | MSR_VEC | MSR_VSX);
#ifdef CONFIG_ALTIVEC
- err |= __get_user(v_regs, &sc->v_regs);
- if (err)
- return err;
+ unsafe_get_user(v_regs, &sc->v_regs, efault_out);
if (v_regs && !access_ok(v_regs, 34 * sizeof(vector128)))
return -EFAULT;
/* Copy 33 vec registers (vr0..31 and vscr) from the stack */
if (v_regs != NULL && (msr & MSR_VEC) != 0) {
- err |= __copy_from_user(&tsk->thread.vr_state, v_regs,
- 33 * sizeof(vector128));
+ unsafe_copy_from_user(&tsk->thread.vr_state, v_regs,
+ 33 * sizeof(vector128), efault_out);
tsk->thread.used_vr = true;
} else if (tsk->thread.used_vr) {
memset(&tsk->thread.vr_state, 0, 33 * sizeof(vector128));
}
/* Always get VRSAVE back */
if (v_regs != NULL)
- err |= __get_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33]);
+ unsafe_get_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33],
+ efault_out);
else
tsk->thread.vrsave = 0;
if (cpu_has_feature(CPU_FTR_ALTIVEC))
mtspr(SPRN_VRSAVE, tsk->thread.vrsave);
#endif /* CONFIG_ALTIVEC */
/* restore floating point */
- err |= copy_fpr_from_user(tsk, &sc->fp_regs);
+ unsafe_copy_fpr_from_user(tsk, &sc->fp_regs, efault_out);
#ifdef CONFIG_VSX
/*
* Get additional VSX data. Update v_regs to point after the
@@ -409,14 +409,17 @@ static long restore_sigcontext(struct task_struct *tsk, sigset_t *set, int sig,
*/
v_regs += ELF_NVRREG;
if ((msr & MSR_VSX) != 0) {
- err |= copy_vsx_from_user(tsk, v_regs);
+ unsafe_copy_vsx_from_user(tsk, v_regs, efault_out);
tsk->thread.used_vsr = true;
} else {
for (i = 0; i < 32 ; i++)
tsk->thread.fp_state.fpr[i][TS_VSRLOWOFFSET] = 0;
}
#endif
- return err;
+ return 0;
+
+efault_out:
+ return -EFAULT;
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
@@ -701,8 +704,14 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
if (__copy_from_user(&set, &new_ctx->uc_sigmask, sizeof(set)))
do_exit(SIGSEGV);
set_current_blocked(&set);
- if (restore_sigcontext(current, NULL, 0, &new_ctx->uc_mcontext))
+
+ if (!user_read_access_begin(new_ctx, ctx_size))
+ return -EFAULT;
+ if (__unsafe_restore_sigcontext(current, NULL, 0, &new_ctx->uc_mcontext)) {
+ user_read_access_end();
do_exit(SIGSEGV);
+ }
+ user_read_access_end();
/* This returns like rt_sigreturn */
set_thread_flag(TIF_RESTOREALL);
@@ -806,8 +815,13 @@ SYSCALL_DEFINE0(rt_sigreturn)
* causing a TM bad thing.
*/
current->thread.regs->msr &= ~MSR_TS_MASK;
- if (restore_sigcontext(current, NULL, 1, &uc->uc_mcontext))
+ if (!user_read_access_begin(uc, sizeof(*uc)))
+ return -EFAULT;
+ if (__unsafe_restore_sigcontext(current, NULL, 1, &uc->uc_mcontext)) {
+ user_read_access_end();
goto badframe;
+ }
+ user_read_access_end();
}
if (restore_altstack(&uc->uc_stack))
--
2.26.1
^ permalink raw reply related
* [PATCH v3 1/8] powerpc/uaccess: Add unsafe_copy_from_user
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
Implement raw_copy_from_user_allowed() which assumes that userspace read
access is open. Use this new function to implement raw_copy_from_user().
Finally, wrap the new function to follow the usual "unsafe_" convention
of taking a label argument.
The new raw_copy_from_user_allowed() calls non-inline __copy_tofrom_user()
internally. This is still safe to call inside user access blocks formed
with user_*_access_begin()/user_*_access_end() since asm functions are not
instrumented for tracing.
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/include/asm/uaccess.h | 28 +++++++++++++++++++---------
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 501c9a79038c..698f3a6d6ae5 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -403,38 +403,45 @@ raw_copy_in_user(void __user *to, const void __user *from, unsigned long n)
}
#endif /* __powerpc64__ */
-static inline unsigned long raw_copy_from_user(void *to,
- const void __user *from, unsigned long n)
+static inline unsigned long
+raw_copy_from_user_allowed(void *to, const void __user *from, unsigned long n)
{
- unsigned long ret;
if (__builtin_constant_p(n) && (n <= 8)) {
- ret = 1;
+ unsigned long ret = 1;
switch (n) {
case 1:
barrier_nospec();
- __get_user_size(*(u8 *)to, from, 1, ret);
+ __get_user_size_allowed(*(u8 *)to, from, 1, ret);
break;
case 2:
barrier_nospec();
- __get_user_size(*(u16 *)to, from, 2, ret);
+ __get_user_size_allowed(*(u16 *)to, from, 2, ret);
break;
case 4:
barrier_nospec();
- __get_user_size(*(u32 *)to, from, 4, ret);
+ __get_user_size_allowed(*(u32 *)to, from, 4, ret);
break;
case 8:
barrier_nospec();
- __get_user_size(*(u64 *)to, from, 8, ret);
+ __get_user_size_allowed(*(u64 *)to, from, 8, ret);
break;
}
if (ret == 0)
return 0;
}
+ return __copy_tofrom_user((__force void __user *)to, from, n);
+}
+
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ unsigned long ret;
+
barrier_nospec();
allow_read_from_user(from, n);
- ret = __copy_tofrom_user((__force void __user *)to, from, n);
+ ret = raw_copy_from_user_allowed(to, from, n);
prevent_read_from_user(from, n);
return ret;
}
@@ -542,6 +549,9 @@ user_write_access_begin(const void __user *ptr, size_t len)
#define unsafe_get_user(x, p, e) unsafe_op_wrap(__get_user_allowed(x, p), e)
#define unsafe_put_user(x, p, e) __put_user_goto(x, p, e)
+#define unsafe_copy_from_user(d, s, l, e) \
+ unsafe_op_wrap(raw_copy_from_user_allowed(d, s, l), e)
+
#define unsafe_copy_to_user(d, s, l, e) \
do { \
u8 __user *_dst = (u8 __user *)(d); \
--
2.26.1
^ permalink raw reply related
* [PATCH v3 5/8] powerpc/signal64: Replace setup_sigcontext() w/ unsafe_setup_sigcontext()
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
Previously setup_sigcontext() performed a costly KUAP switch on every
uaccess operation. These repeated uaccess switches cause a significant
drop in signal handling performance.
Rewrite setup_sigcontext() to assume that a userspace write access window
is open. Replace all uaccess functions with their 'unsafe' versions
which avoid the repeated uaccess switches.
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal_64.c | 70 ++++++++++++++++++++-------------
1 file changed, 43 insertions(+), 27 deletions(-)
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index dd3787f67a78..fd3c1ab9a1ea 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -101,9 +101,13 @@ static void prepare_setup_sigcontext(struct task_struct *tsk, int ctx_has_vsx_re
* Set up the sigcontext for the signal frame.
*/
-static long setup_sigcontext(struct sigcontext __user *sc,
- struct task_struct *tsk, int signr, sigset_t *set,
- unsigned long handler, int ctx_has_vsx_region)
+#define unsafe_setup_sigcontext(sc, tsk, signr, set, handler, \
+ ctx_has_vsx_region, e) \
+ unsafe_op_wrap(__unsafe_setup_sigcontext(sc, tsk, signr, set, \
+ handler, ctx_has_vsx_region), e)
+static long notrace __unsafe_setup_sigcontext(struct sigcontext __user *sc,
+ struct task_struct *tsk, int signr, sigset_t *set,
+ unsigned long handler, int ctx_has_vsx_region)
{
/* When CONFIG_ALTIVEC is set, we _always_ setup v_regs even if the
* process never used altivec yet (MSR_VEC is zero in pt_regs of
@@ -118,20 +122,19 @@ static long setup_sigcontext(struct sigcontext __user *sc,
#endif
struct pt_regs *regs = tsk->thread.regs;
unsigned long msr = regs->msr;
- long err = 0;
/* Force usr to alway see softe as 1 (interrupts enabled) */
unsigned long softe = 0x1;
BUG_ON(tsk != current);
#ifdef CONFIG_ALTIVEC
- err |= __put_user(v_regs, &sc->v_regs);
+ unsafe_put_user(v_regs, &sc->v_regs, efault_out);
/* save altivec registers */
if (tsk->thread.used_vr) {
/* Copy 33 vec registers (vr0..31 and vscr) to the stack */
- err |= __copy_to_user(v_regs, &tsk->thread.vr_state,
- 33 * sizeof(vector128));
+ unsafe_copy_to_user(v_regs, &tsk->thread.vr_state,
+ 33 * sizeof(vector128), efault_out);
/* set MSR_VEC in the MSR value in the frame to indicate that sc->v_reg)
* contains valid data.
*/
@@ -140,12 +143,12 @@ static long setup_sigcontext(struct sigcontext __user *sc,
/* We always copy to/from vrsave, it's 0 if we don't have or don't
* use altivec.
*/
- err |= __put_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33]);
+ unsafe_put_user(tsk->thread.vrsave, (u32 __user *)&v_regs[33], efault_out);
#else /* CONFIG_ALTIVEC */
- err |= __put_user(0, &sc->v_regs);
+ unsafe_put_user(0, &sc->v_regs, efault_out);
#endif /* CONFIG_ALTIVEC */
/* copy fpr regs and fpscr */
- err |= copy_fpr_to_user(&sc->fp_regs, tsk);
+ unsafe_copy_fpr_to_user(&sc->fp_regs, tsk, efault_out);
/*
* Clear the MSR VSX bit to indicate there is no valid state attached
@@ -160,24 +163,27 @@ static long setup_sigcontext(struct sigcontext __user *sc,
*/
if (tsk->thread.used_vsr && ctx_has_vsx_region) {
v_regs += ELF_NVRREG;
- err |= copy_vsx_to_user(v_regs, tsk);
+ unsafe_copy_vsx_to_user(v_regs, tsk, efault_out);
/* set MSR_VSX in the MSR value in the frame to
* indicate that sc->vs_reg) contains valid data.
*/
msr |= MSR_VSX;
}
#endif /* CONFIG_VSX */
- err |= __put_user(&sc->gp_regs, &sc->regs);
+ unsafe_put_user(&sc->gp_regs, &sc->regs, efault_out);
WARN_ON(!FULL_REGS(regs));
- err |= __copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE);
- err |= __put_user(msr, &sc->gp_regs[PT_MSR]);
- err |= __put_user(softe, &sc->gp_regs[PT_SOFTE]);
- err |= __put_user(signr, &sc->signal);
- err |= __put_user(handler, &sc->handler);
+ unsafe_copy_to_user(&sc->gp_regs, regs, GP_REGS_SIZE, efault_out);
+ unsafe_put_user(msr, &sc->gp_regs[PT_MSR], efault_out);
+ unsafe_put_user(softe, &sc->gp_regs[PT_SOFTE], efault_out);
+ unsafe_put_user(signr, &sc->signal, efault_out);
+ unsafe_put_user(handler, &sc->handler, efault_out);
if (set != NULL)
- err |= __put_user(set->sig[0], &sc->oldmask);
+ unsafe_put_user(set->sig[0], &sc->oldmask, efault_out);
- return err;
+ return 0;
+
+efault_out:
+ return -EFAULT;
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
@@ -664,12 +670,15 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
if (old_ctx != NULL) {
prepare_setup_sigcontext(current, ctx_has_vsx_region);
- if (!access_ok(old_ctx, ctx_size)
- || setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL, 0,
- ctx_has_vsx_region)
- || __copy_to_user(&old_ctx->uc_sigmask,
- ¤t->blocked, sizeof(sigset_t)))
+ if (!user_write_access_begin(old_ctx, ctx_size))
return -EFAULT;
+
+ unsafe_setup_sigcontext(&old_ctx->uc_mcontext, current, 0, NULL,
+ 0, ctx_has_vsx_region, efault_out);
+ unsafe_copy_to_user(&old_ctx->uc_sigmask, ¤t->blocked,
+ sizeof(sigset_t), efault_out);
+
+ user_write_access_end();
}
if (new_ctx == NULL)
return 0;
@@ -698,6 +707,10 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
/* This returns like rt_sigreturn */
set_thread_flag(TIF_RESTOREALL);
return 0;
+
+efault_out:
+ user_write_access_end();
+ return -EFAULT;
}
@@ -849,9 +862,12 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
} else {
err |= __put_user(0, &frame->uc.uc_link);
prepare_setup_sigcontext(tsk, 1);
- err |= setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig,
- NULL, (unsigned long)ksig->ka.sa.sa_handler,
- 1);
+ if (!user_write_access_begin(frame, sizeof(struct rt_sigframe)))
+ return -EFAULT;
+ err |= __unsafe_setup_sigcontext(&frame->uc.uc_mcontext, tsk,
+ ksig->sig, NULL,
+ (unsigned long)ksig->ka.sa.sa_handler, 1);
+ user_write_access_end();
}
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
if (err)
--
2.26.1
^ permalink raw reply related
* [PATCH v3 7/8] powerpc/signal64: Rewrite handle_rt_signal64() to minimise uaccess switches
From: Christopher M. Riedl @ 2021-01-09 3:25 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Daniel Axtens
In-Reply-To: <20210109032557.13831-1-cmr@codefail.de>
From: Daniel Axtens <dja@axtens.net>
Add uaccess blocks and use the 'unsafe' versions of functions doing user
access where possible to reduce the number of times uaccess has to be
opened/closed.
There is no 'unsafe' version of copy_siginfo_to_user, so move it
slightly to allow for a "longer" uaccess block.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Co-developed-by: Christopher M. Riedl <cmr@codefail.de>
Signed-off-by: Christopher M. Riedl <cmr@codefail.de>
---
arch/powerpc/kernel/signal_64.c | 54 +++++++++++++++++++++------------
1 file changed, 34 insertions(+), 20 deletions(-)
diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 0c7f633b832b..7e62d62ef482 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -848,44 +848,51 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
unsigned long msr __maybe_unused = regs->msr;
frame = get_sigframe(ksig, tsk, sizeof(*frame), 0);
- if (!access_ok(frame, sizeof(*frame)))
- goto badframe;
- err |= __put_user(&frame->info, &frame->pinfo);
- err |= __put_user(&frame->uc, &frame->puc);
- err |= copy_siginfo_to_user(&frame->info, &ksig->info);
- if (err)
+ /* This only applies when calling unsafe_setup_sigcontext() and must be
+ * called before opening the uaccess window.
+ */
+ if (!MSR_TM_ACTIVE(msr))
+ prepare_setup_sigcontext(tsk, 1);
+
+ if (!user_write_access_begin(frame, sizeof(*frame)))
goto badframe;
+ unsafe_put_user(&frame->info, &frame->pinfo, badframe_block);
+ unsafe_put_user(&frame->uc, &frame->puc, badframe_block);
+
/* Create the ucontext. */
- err |= __put_user(0, &frame->uc.uc_flags);
- err |= __save_altstack(&frame->uc.uc_stack, regs->gpr[1]);
+ unsafe_put_user(0, &frame->uc.uc_flags, badframe_block);
+ unsafe_save_altstack(&frame->uc.uc_stack, regs->gpr[1], badframe_block);
if (MSR_TM_ACTIVE(msr)) {
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/* The ucontext_t passed to userland points to the second
* ucontext_t (for transactional state) with its uc_link ptr.
*/
- err |= __put_user(&frame->uc_transact, &frame->uc.uc_link);
+ unsafe_put_user(&frame->uc_transact, &frame->uc.uc_link, badframe_block);
+
+ user_write_access_end();
+
err |= setup_tm_sigcontexts(&frame->uc.uc_mcontext,
&frame->uc_transact.uc_mcontext,
tsk, ksig->sig, NULL,
(unsigned long)ksig->ka.sa.sa_handler,
msr);
+
+ if (!user_write_access_begin(frame, sizeof(struct rt_sigframe)))
+ goto badframe;
+
#endif
} else {
- err |= __put_user(0, &frame->uc.uc_link);
- prepare_setup_sigcontext(tsk, 1);
- if (!user_write_access_begin(frame, sizeof(struct rt_sigframe)))
- return -EFAULT;
- err |= __unsafe_setup_sigcontext(&frame->uc.uc_mcontext, tsk,
- ksig->sig, NULL,
- (unsigned long)ksig->ka.sa.sa_handler, 1);
- user_write_access_end();
+ unsafe_put_user(0, &frame->uc.uc_link, badframe_block);
+ unsafe_setup_sigcontext(&frame->uc.uc_mcontext, tsk, ksig->sig,
+ NULL, (unsigned long)ksig->ka.sa.sa_handler,
+ 1, badframe_block);
}
- err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
- if (err)
- goto badframe;
+
+ unsafe_copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set), badframe_block);
+ user_write_access_end();
/* Make sure signal handler doesn't get spurious FP exceptions */
tsk->thread.fp_state.fpscr = 0;
@@ -900,6 +907,11 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
regs->nip = (unsigned long) &frame->tramp[0];
}
+
+ /* Save the siginfo outside of the unsafe block. */
+ if (copy_siginfo_to_user(&frame->info, &ksig->info))
+ goto badframe;
+
/* Allocate a dummy caller frame for the signal handler. */
newsp = ((unsigned long)frame) - __SIGNAL_FRAMESIZE;
err |= put_user(regs->gpr[1], (unsigned long __user *)newsp);
@@ -939,6 +951,8 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
return 0;
+badframe_block:
+ user_write_access_end();
badframe:
signal_fault(current, regs, "handle_rt_signal64", frame);
--
2.26.1
^ permalink raw reply related
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