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Message-Id: <20241216115006.415861-9-yeoreum.yun@arm.com>
Date: Mon, 16 Dec 2024 11:50:05 +0000
From: Yeoreum Yun <yeoreum.yun@....com>
To: suzuki.poulose@....com,
mike.leach@...aro.org,
james.clark@...aro.org,
alexander.shishkin@...ux.intel.com,
bigeasy@...utronix.de,
clrkwllms@...nel.org,
rostedt@...dmis.org
Cc: coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
linux-rt-devel@...ts.linux.dev,
Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v3 8/9] coresight-tmc: change tmc_drvdata spinlock's type to raw_spinlock_t
In coresight-tmc drivers, tmc_drvdata->spinlock can be held
during __schedule() by perf_event_task_sched_out()/in().
Since tmc_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 tmc_drvdata->spinlock in coresight-tmc 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@....com>
---
.../hwtracing/coresight/coresight-tmc-core.c | 6 +--
.../hwtracing/coresight/coresight-tmc-etf.c | 48 +++++++++----------
.../hwtracing/coresight/coresight-tmc-etr.c | 40 ++++++++--------
drivers/hwtracing/coresight/coresight-tmc.h | 2 +-
4 files changed, 48 insertions(+), 48 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
index e9876252a789..4e9925300931 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-core.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
@@ -492,7 +492,7 @@ static int __tmc_probe(struct device *dev, struct resource *res)
drvdata->base = base;
desc.access = CSDEV_ACCESS_IOMEM(base);
- spin_lock_init(&drvdata->spinlock);
+ raw_spin_lock_init(&drvdata->spinlock);
devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
drvdata->config_type = BMVAL(devid, 6, 7);
@@ -596,7 +596,7 @@ static void tmc_shutdown(struct amba_device *adev)
unsigned long flags;
struct tmc_drvdata *drvdata = amba_get_drvdata(adev);
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (coresight_get_mode(drvdata->csdev) == CS_MODE_DISABLED)
goto out;
@@ -610,7 +610,7 @@ static void tmc_shutdown(struct amba_device *adev)
* the system is going down after this.
*/
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
}
static void __tmc_remove(struct device *dev)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index d4f641cd9de6..fca8e9ffb3cf 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -182,9 +182,9 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
* If we don't have a buffer release the lock and allocate memory.
* Otherwise keep the lock and move along.
*/
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (!drvdata->buf) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Allocating the memory here while outside of the spinlock */
buf = kzalloc(drvdata->size, GFP_KERNEL);
@@ -192,7 +192,7 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
return -ENOMEM;
/* Let's try again */
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
}
if (drvdata->reading) {
@@ -235,7 +235,7 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
used = false;
}
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Free memory outside the spinlock if need be */
if (!used)
@@ -253,7 +253,7 @@ static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data)
struct perf_output_handle *handle = data;
struct cs_buffers *buf = etm_perf_sink_config(handle);
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
do {
ret = -EINVAL;
if (drvdata->reading)
@@ -296,7 +296,7 @@ static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data)
csdev->refcnt++;
}
} while (0);
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return ret;
}
@@ -331,16 +331,16 @@ static int tmc_disable_etf_sink(struct coresight_device *csdev)
unsigned long flags;
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return -EBUSY;
}
csdev->refcnt--;
if (csdev->refcnt) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return -EBUSY;
}
@@ -351,7 +351,7 @@ static int tmc_disable_etf_sink(struct coresight_device *csdev)
drvdata->pid = -1;
coresight_set_mode(csdev, CS_MODE_DISABLED);
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
dev_dbg(&csdev->dev, "TMC-ETB/ETF disabled\n");
return 0;
@@ -366,9 +366,9 @@ static int tmc_enable_etf_link(struct coresight_device *csdev,
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
bool first_enable = false;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return -EBUSY;
}
@@ -381,7 +381,7 @@ static int tmc_enable_etf_link(struct coresight_device *csdev,
}
if (!ret)
csdev->refcnt++;
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (first_enable)
dev_dbg(&csdev->dev, "TMC-ETF enabled\n");
@@ -396,9 +396,9 @@ static void tmc_disable_etf_link(struct coresight_device *csdev,
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
bool last_disable = false;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return;
}
@@ -408,7 +408,7 @@ static void tmc_disable_etf_link(struct coresight_device *csdev,
coresight_set_mode(csdev, CS_MODE_DISABLED);
last_disable = true;
}
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (last_disable)
dev_dbg(&csdev->dev, "TMC-ETF disabled\n");
@@ -488,7 +488,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
if (WARN_ON_ONCE(coresight_get_mode(csdev) != CS_MODE_PERF))
return 0;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/* Don't do anything if another tracer is using this sink */
if (csdev->refcnt != 1)
@@ -585,7 +585,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
*/
CS_LOCK(drvdata->base);
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return to_read;
}
@@ -623,7 +623,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata)
drvdata->config_type != TMC_CONFIG_TYPE_ETF))
return -EINVAL;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
ret = -EBUSY;
@@ -655,7 +655,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata)
drvdata->reading = true;
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return ret;
}
@@ -672,14 +672,14 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
drvdata->config_type != TMC_CONFIG_TYPE_ETF))
return -EINVAL;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/* Re-enable the TMC if need be */
if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) {
/* There is no point in reading a TMC in HW FIFO mode */
mode = readl_relaxed(drvdata->base + TMC_MODE);
if (mode != TMC_MODE_CIRCULAR_BUFFER) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return -EINVAL;
}
/*
@@ -693,7 +693,7 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
memset(drvdata->buf, 0, drvdata->size);
rc = __tmc_etb_enable_hw(drvdata);
if (rc) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return rc;
}
} else {
@@ -706,7 +706,7 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
}
drvdata->reading = false;
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
/*
* Free allocated memory outside of the spinlock. There is no need
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index a48bb85d0e7f..a0a90ce7333e 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1176,10 +1176,10 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
* buffer, provided the size matches. Any allocation has to be done
* with the lock released.
*/
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
sysfs_buf = READ_ONCE(drvdata->sysfs_buf);
if (!sysfs_buf || (sysfs_buf->size != drvdata->size)) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Allocate memory with the locks released */
free_buf = new_buf = tmc_etr_setup_sysfs_buf(drvdata);
@@ -1187,7 +1187,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
return new_buf;
/* Let's try again */
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
}
if (drvdata->reading || coresight_get_mode(csdev) == CS_MODE_PERF) {
@@ -1206,7 +1206,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
}
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Free memory outside the spinlock if need be */
if (free_buf)
@@ -1224,7 +1224,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
if (IS_ERR(sysfs_buf))
return PTR_ERR(sysfs_buf);
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/*
* In sysFS mode we can have multiple writers per sink. Since this
@@ -1243,7 +1243,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
}
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (!ret)
dev_dbg(&csdev->dev, "TMC-ETR enabled\n");
@@ -1562,17 +1562,17 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
struct etr_perf_buffer *etr_perf = config;
struct etr_buf *etr_buf = etr_perf->etr_buf;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/* Don't do anything if another tracer is using this sink */
if (csdev->refcnt != 1) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
goto out;
}
if (WARN_ON(drvdata->perf_buf != etr_buf)) {
lost = true;
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
goto out;
}
@@ -1582,7 +1582,7 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
tmc_sync_etr_buf(drvdata);
CS_LOCK(drvdata->base);
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
lost = etr_buf->full;
offset = etr_buf->offset;
@@ -1651,7 +1651,7 @@ static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data)
struct perf_output_handle *handle = data;
struct etr_perf_buffer *etr_perf = etm_perf_sink_config(handle);
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/* Don't use this sink if it is already claimed by sysFS */
if (coresight_get_mode(csdev) == CS_MODE_SYSFS) {
rc = -EBUSY;
@@ -1691,7 +1691,7 @@ static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data)
}
unlock_out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return rc;
}
@@ -1713,16 +1713,16 @@ static int tmc_disable_etr_sink(struct coresight_device *csdev)
unsigned long flags;
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return -EBUSY;
}
csdev->refcnt--;
if (csdev->refcnt) {
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return -EBUSY;
}
@@ -1735,7 +1735,7 @@ static int tmc_disable_etr_sink(struct coresight_device *csdev)
/* Reset perf specific data */
drvdata->perf_buf = NULL;
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
dev_dbg(&csdev->dev, "TMC-ETR disabled\n");
return 0;
@@ -1762,7 +1762,7 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR))
return -EINVAL;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->reading) {
ret = -EBUSY;
goto out;
@@ -1784,7 +1784,7 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
drvdata->reading = true;
out:
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
return ret;
}
@@ -1798,7 +1798,7 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR))
return -EINVAL;
- spin_lock_irqsave(&drvdata->spinlock, flags);
+ raw_spin_lock_irqsave(&drvdata->spinlock, flags);
/* RE-enable the TMC if need be */
if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) {
@@ -1818,7 +1818,7 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
}
drvdata->reading = false;
- spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Free allocated memory out side of the spinlock */
if (sysfs_buf)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 2671926be62a..60b395025bc4 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -195,7 +195,7 @@ struct tmc_drvdata {
void __iomem *base;
struct coresight_device *csdev;
struct miscdevice miscdev;
- spinlock_t spinlock;
+ raw_spinlock_t spinlock;
pid_t pid;
bool reading;
union {
--
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
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