[PATCH v2 4/9] coresight-cti: change cti_drvdata spinlock's type to raw_spinlock_t
Yeoreum Yun
yeoreum.yun at arm.com
Tue Dec 3 03:49:37 PST 2024
In coresight-cti drivers, cti_drvdata->spinlock can be held during __schedule()
by perf_event_task_sched_out()/in().
Since cti_drvdata->spinlock type is spinlock_t and
perf_event_task_sched_out()/in() is called after acquiring rq_lock,
which is raw_spinlock_t (an unsleepable lock),
this poses an issue in PREEMPT_RT kernel where spinlock_t is sleepable.
To address this, change type cti_drvdata->spinlock in coresight-cti drivers,
which can be called by perf_event_task_sched_out()/in(),
from spinlock_t to raw_spinlock_t.
Signed-off-by: Yeoreum Yun <yeoreum.yun at arm.com>
---
.../hwtracing/coresight/coresight-cti-core.c | 44 +++++------
.../hwtracing/coresight/coresight-cti-sysfs.c | 76 +++++++++----------
drivers/hwtracing/coresight/coresight-cti.h | 2 +-
3 files changed, 61 insertions(+), 61 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-cti-core.c b/drivers/hwtracing/coresight/coresight-cti-core.c
index d2b5a5718c29..80f6265e3740 100644
--- a/drivers/hwtracing/coresight/coresight-cti-core.c
+++ b/drivers/hwtracing/coresight/coresight-cti-core.c
@@ -93,7 +93,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
unsigned long flags;
int rc = 0;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/* no need to do anything if enabled or unpowered*/
if (config->hw_enabled || !config->hw_powered)
@@ -108,7 +108,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
config->hw_enabled = true;
drvdata->config.enable_req_count++;
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return rc;
cti_state_unchanged:
@@ -116,7 +116,7 @@ static int cti_enable_hw(struct cti_drvdata *drvdata)
/* cannot enable due to error */
cti_err_not_enabled:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return rc;
}
@@ -125,7 +125,7 @@ static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
{
struct cti_config *config = &drvdata->config;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
config->hw_powered = true;
/* no need to do anything if no enable request */
@@ -138,12 +138,12 @@ static void cti_cpuhp_enable_hw(struct cti_drvdata *drvdata)
cti_write_all_hw_regs(drvdata);
config->hw_enabled = true;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return;
/* did not re-enable due to no claim / no request */
cti_hp_not_enabled:
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
}
/* disable hardware */
@@ -153,7 +153,7 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
struct coresight_device *csdev = drvdata->csdev;
int ret = 0;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* don't allow negative refcounts, return an error */
if (!drvdata->config.enable_req_count) {
@@ -177,12 +177,12 @@ static int cti_disable_hw(struct cti_drvdata *drvdata)
coresight_disclaim_device_unlocked(csdev);
CS_LOCK(drvdata->base);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return ret;
/* not disabled this call */
cti_not_disabled:
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return ret;
}
@@ -198,11 +198,11 @@ void cti_write_intack(struct device *dev, u32 ackval)
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* write if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, CTIINTACK, ackval);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
}
/*
@@ -369,7 +369,7 @@ int cti_channel_trig_op(struct device *dev, enum cti_chan_op op,
reg_offset = (direction == CTI_TRIG_IN ? CTIINEN(trigger_idx) :
CTIOUTEN(trigger_idx));
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* read - modify write - the trigger / channel enable value */
reg_value = direction == CTI_TRIG_IN ? config->ctiinen[trigger_idx] :
@@ -388,7 +388,7 @@ int cti_channel_trig_op(struct device *dev, enum cti_chan_op op,
/* write through if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, reg_offset, reg_value);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return 0;
}
@@ -406,7 +406,7 @@ int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op,
chan_bitmask = BIT(channel_idx);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
reg_value = config->ctigate;
switch (op) {
case CTI_GATE_CHAN_ENABLE:
@@ -426,7 +426,7 @@ int cti_channel_gate_op(struct device *dev, enum cti_chan_gate_op op,
if (cti_active(config))
cti_write_single_reg(drvdata, CTIGATE, reg_value);
}
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return err;
}
@@ -445,7 +445,7 @@ int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
chan_bitmask = BIT(channel_idx);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
reg_value = config->ctiappset;
switch (op) {
case CTI_CHAN_SET:
@@ -473,7 +473,7 @@ int cti_channel_setop(struct device *dev, enum cti_chan_set_op op,
if ((err == 0) && cti_active(config))
cti_write_single_reg(drvdata, reg_offset, reg_value);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return err;
}
@@ -676,7 +676,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
if (WARN_ON_ONCE(drvdata->ctidev.cpu != cpu))
return NOTIFY_BAD;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
switch (cmd) {
case CPU_PM_ENTER:
@@ -716,7 +716,7 @@ static int cti_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd,
}
cti_notify_exit:
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return notify_res;
}
@@ -743,11 +743,11 @@ static int cti_dying_cpu(unsigned int cpu)
if (!drvdata)
return 0;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
drvdata->config.hw_powered = false;
if (drvdata->config.hw_enabled)
coresight_disclaim_device(drvdata->csdev);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return 0;
}
@@ -888,7 +888,7 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id)
drvdata->ctidev.ctm_id = 0;
INIT_LIST_HEAD(&drvdata->ctidev.trig_cons);
- spin_lock_init(&drvdata->spinlock);
+ raw_spin_lock_init(&drvdata->spinlock);
/* initialise CTI driver config values */
cti_set_default_config(dev, drvdata);
diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
index d25dd2737b49..572b80ee96fb 100644
--- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c
@@ -84,11 +84,11 @@ static ssize_t enable_show(struct device *dev,
bool enabled, powered;
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
enable_req = drvdata->config.enable_req_count;
powered = drvdata->config.hw_powered;
enabled = drvdata->config.hw_enabled;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
if (powered)
return sprintf(buf, "%d\n", enabled);
@@ -134,9 +134,9 @@ static ssize_t powered_show(struct device *dev,
bool powered;
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
powered = drvdata->config.hw_powered;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return sprintf(buf, "%d\n", powered);
}
@@ -181,10 +181,10 @@ static ssize_t coresight_cti_reg_show(struct device *dev,
u32 val = 0;
pm_runtime_get_sync(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
if (drvdata->config.hw_powered)
val = readl_relaxed(drvdata->base + cti_attr->off);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
pm_runtime_put_sync(dev->parent);
return sysfs_emit(buf, "0x%x\n", val);
}
@@ -202,10 +202,10 @@ static __maybe_unused ssize_t coresight_cti_reg_store(struct device *dev,
return -EINVAL;
pm_runtime_get_sync(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
if (drvdata->config.hw_powered)
cti_write_single_reg(drvdata, cti_attr->off, val);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
pm_runtime_put_sync(dev->parent);
return size;
}
@@ -264,7 +264,7 @@ static ssize_t cti_reg32_show(struct device *dev, char *buf,
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
if ((reg_offset >= 0) && cti_active(config)) {
CS_UNLOCK(drvdata->base);
val = readl_relaxed(drvdata->base + reg_offset);
@@ -274,7 +274,7 @@ static ssize_t cti_reg32_show(struct device *dev, char *buf,
} else if (pcached_val) {
val = *pcached_val;
}
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return sprintf(buf, "%#x\n", val);
}
@@ -293,7 +293,7 @@ static ssize_t cti_reg32_store(struct device *dev, const char *buf,
if (kstrtoul(buf, 0, &val))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* local store */
if (pcached_val)
*pcached_val = (u32)val;
@@ -301,7 +301,7 @@ static ssize_t cti_reg32_store(struct device *dev, const char *buf,
/* write through if offset and enabled */
if ((reg_offset >= 0) && cti_active(config))
cti_write_single_reg(drvdata, reg_offset, val);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
@@ -349,9 +349,9 @@ static ssize_t inout_sel_store(struct device *dev,
if (val > (CTIINOUTEN_MAX - 1))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
drvdata->config.ctiinout_sel = val;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(inout_sel);
@@ -364,10 +364,10 @@ static ssize_t inen_show(struct device *dev,
int index;
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
index = drvdata->config.ctiinout_sel;
val = drvdata->config.ctiinen[index];
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return sprintf(buf, "%#lx\n", val);
}
@@ -383,14 +383,14 @@ static ssize_t inen_store(struct device *dev,
if (kstrtoul(buf, 0, &val))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
index = config->ctiinout_sel;
config->ctiinen[index] = val;
/* write through if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, CTIINEN(index), val);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(inen);
@@ -403,10 +403,10 @@ static ssize_t outen_show(struct device *dev,
int index;
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
index = drvdata->config.ctiinout_sel;
val = drvdata->config.ctiouten[index];
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return sprintf(buf, "%#lx\n", val);
}
@@ -422,14 +422,14 @@ static ssize_t outen_store(struct device *dev,
if (kstrtoul(buf, 0, &val))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
index = config->ctiinout_sel;
config->ctiouten[index] = val;
/* write through if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, CTIOUTEN(index), val);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(outen);
@@ -463,7 +463,7 @@ static ssize_t appclear_store(struct device *dev,
if (kstrtoul(buf, 0, &val))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* a 1'b1 in appclr clears down the same bit in appset*/
config->ctiappset &= ~val;
@@ -471,7 +471,7 @@ static ssize_t appclear_store(struct device *dev,
/* write through if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, CTIAPPCLEAR, val);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_WO(appclear);
@@ -487,12 +487,12 @@ static ssize_t apppulse_store(struct device *dev,
if (kstrtoul(buf, 0, &val))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* write through if enabled */
if (cti_active(config))
cti_write_single_reg(drvdata, CTIAPPPULSE, val);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_WO(apppulse);
@@ -681,9 +681,9 @@ static ssize_t trig_filter_enable_show(struct device *dev,
u32 val;
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
val = drvdata->config.trig_filter_enable;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return sprintf(buf, "%d\n", val);
}
@@ -697,9 +697,9 @@ static ssize_t trig_filter_enable_store(struct device *dev,
if (kstrtoul(buf, 0, &val))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
drvdata->config.trig_filter_enable = !!val;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_RW(trig_filter_enable);
@@ -728,7 +728,7 @@ static ssize_t chan_xtrigs_reset_store(struct device *dev,
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
struct cti_config *config = &drvdata->config;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
/* clear the CTI trigger / channel programming registers */
for (i = 0; i < config->nr_trig_max; i++) {
@@ -747,7 +747,7 @@ static ssize_t chan_xtrigs_reset_store(struct device *dev,
if (cti_active(config))
cti_write_all_hw_regs(drvdata);
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
static DEVICE_ATTR_WO(chan_xtrigs_reset);
@@ -768,9 +768,9 @@ static ssize_t chan_xtrigs_sel_store(struct device *dev,
if (val > (drvdata->config.nr_ctm_channels - 1))
return -EINVAL;
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
drvdata->config.xtrig_rchan_sel = val;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return size;
}
@@ -781,9 +781,9 @@ static ssize_t chan_xtrigs_sel_show(struct device *dev,
unsigned long val;
struct cti_drvdata *drvdata = dev_get_drvdata(dev->parent);
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
val = drvdata->config.xtrig_rchan_sel;
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
return sprintf(buf, "%ld\n", val);
}
@@ -838,12 +838,12 @@ static ssize_t print_chan_list(struct device *dev,
unsigned long inuse_bits = 0, chan_mask;
/* scan regs to get bitmap of channels in use. */
- spin_lock(&drvdata->spinlock);
+ raw_spin_lock(&drvdata->spinlock);
for (i = 0; i < config->nr_trig_max; i++) {
inuse_bits |= config->ctiinen[i];
inuse_bits |= config->ctiouten[i];
}
- spin_unlock(&drvdata->spinlock);
+ raw_spin_unlock(&drvdata->spinlock);
/* inverse bits if printing free channels */
if (!inuse)
diff --git a/drivers/hwtracing/coresight/coresight-cti.h b/drivers/hwtracing/coresight/coresight-cti.h
index cb9ee616d01f..16e310e7e9d4 100644
--- a/drivers/hwtracing/coresight/coresight-cti.h
+++ b/drivers/hwtracing/coresight/coresight-cti.h
@@ -175,7 +175,7 @@ struct cti_drvdata {
void __iomem *base;
struct coresight_device *csdev;
struct cti_device ctidev;
- spinlock_t spinlock;
+ raw_spinlock_t spinlock;
struct cti_config config;
struct list_head node;
void (*csdev_release)(struct device *dev);
--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
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