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coresight: etb10: adding operation mode for sink->enable()

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Adding an operation mode to the sink->enable() API in order
to prevent simultaneous access from different callers.

TPIU and TMC won't be supplemented with the AUX area
API immediately and as such ignore the new mode.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2016-02-17 17:51:59 -07:00 committed by Greg Kroah-Hartman
parent 27b10da8ff
commit e827d4550a
6 changed files with 32 additions and 16 deletions
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30
drivers/hwtracing/coresight/coresight-etb10.c
View file

@ -73,9 +73,9 @@
* @miscdev: specifics to handle "/dev/xyz.etb" entry.
* @spinlock: only one at a time pls.
* @reading: synchronise user space access to etb buffer.
* @mode: this ETB is being used.
* @buf: area of memory where ETB buffer content gets sent.
* @buffer_depth: size of @buf.
* @enable: this ETB is being used.
* @trigger_cntr: amount of words to store after a trigger.
*/
struct etb_drvdata {
@ -86,9 +86,9 @@ struct etb_drvdata {
struct miscdevice miscdev;
spinlock_t spinlock;
local_t reading;
local_t mode;
u8 *buf;
u32 buffer_depth;
bool enable;
u32 trigger_cntr;
};
@ -133,16 +133,31 @@ static void etb_enable_hw(struct etb_drvdata *drvdata)
CS_LOCK(drvdata->base);
}
static int etb_enable(struct coresight_device *csdev)
static int etb_enable(struct coresight_device *csdev, u32 mode)
{
struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
u32 val;
unsigned long flags;
struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
val = local_cmpxchg(&drvdata->mode,
CS_MODE_DISABLED, mode);
/*
* When accessing from Perf, a HW buffer can be handled
* by a single trace entity. In sysFS mode many tracers
* can be logging to the same HW buffer.
*/
if (val == CS_MODE_PERF)
return -EBUSY;
/* Nothing to do, the tracer is already enabled. */
if (val == CS_MODE_SYSFS)
goto out;
spin_lock_irqsave(&drvdata->spinlock, flags);
etb_enable_hw(drvdata);
drvdata->enable = true;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
out:
dev_info(drvdata->dev, "ETB enabled\n");
return 0;
}
@ -243,9 +258,10 @@ static void etb_disable(struct coresight_device *csdev)
spin_lock_irqsave(&drvdata->spinlock, flags);
etb_disable_hw(drvdata);
etb_dump_hw(drvdata);
drvdata->enable = false;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
local_set(&drvdata->mode, CS_MODE_DISABLED);
dev_info(drvdata->dev, "ETB disabled\n");
}
@ -263,7 +279,7 @@ static void etb_dump(struct etb_drvdata *drvdata)
unsigned long flags;
spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->enable) {
if (local_read(&drvdata->mode) == CS_MODE_SYSFS) {
etb_disable_hw(drvdata);
etb_dump_hw(drvdata);
etb_enable_hw(drvdata);

2
drivers/hwtracing/coresight/coresight-priv.h
View file

@ -62,7 +62,7 @@ static inline void CS_UNLOCK(void __iomem *addr)
}
void coresight_disable_path(struct list_head *path);
int coresight_enable_path(struct list_head *path);
int coresight_enable_path(struct list_head *path, u32 mode);
struct coresight_device *coresight_get_sink(struct list_head *path);
struct list_head *coresight_build_path(struct coresight_device *csdev);
void coresight_release_path(struct list_head *path);

2
drivers/hwtracing/coresight/coresight-tmc.c
View file

@ -265,7 +265,7 @@ static int tmc_enable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
return 0;
}
static int tmc_enable_sink(struct coresight_device *csdev)
static int tmc_enable_sink(struct coresight_device *csdev, u32 mode)
{
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

2
drivers/hwtracing/coresight/coresight-tpiu.c
View file

@ -70,7 +70,7 @@ static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
CS_LOCK(drvdata->base);
}
static int tpiu_enable(struct coresight_device *csdev)
static int tpiu_enable(struct coresight_device *csdev, u32 mode)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);

10
drivers/hwtracing/coresight/coresight.c
View file

@ -121,13 +121,13 @@ static int coresight_find_link_outport(struct coresight_device *csdev,
return 0;
}
static int coresight_enable_sink(struct coresight_device *csdev)
static int coresight_enable_sink(struct coresight_device *csdev, u32 mode)
{
int ret;
if (!csdev->enable) {
if (sink_ops(csdev)->enable) {
ret = sink_ops(csdev)->enable(csdev);
ret = sink_ops(csdev)->enable(csdev, mode);
if (ret)
return ret;
}
@ -283,7 +283,7 @@ void coresight_disable_path(struct list_head *path)
}
}
int coresight_enable_path(struct list_head *path)
int coresight_enable_path(struct list_head *path, u32 mode)
{
int ret = 0;
@ -296,7 +296,7 @@ int coresight_enable_path(struct list_head *path)
switch (csdev->type) {
case CORESIGHT_DEV_TYPE_SINK:
case CORESIGHT_DEV_TYPE_LINKSINK:
ret = coresight_enable_sink(csdev);
ret = coresight_enable_sink(csdev, mode);
if (ret)
goto err;
break;
@ -454,7 +454,7 @@ int coresight_enable(struct coresight_device *csdev)
goto out;
}
ret = coresight_enable_path(path);
ret = coresight_enable_path(path, CS_MODE_SYSFS);
if (ret)
goto err_path;

2
include/linux/coresight.h
View file

@ -186,7 +186,7 @@ struct coresight_device {
* @disable: disables the sink.
*/
struct coresight_ops_sink {
int (*enable)(struct coresight_device *csdev);
int (*enable)(struct coresight_device *csdev, u32 mode);
void (*disable)(struct coresight_device *csdev);
};