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coresight: etm4x: implementing user/kernel mode tracing 

Adding new mode to limit tracing to kernel or user space.

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 2016-04-05 11:53:48 -06:00 committed by Greg Kroah-Hartman
parent c38a9ec2b2
commit 4f6fce5452
3 changed files with 42 additions and 1 deletions
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3
drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
View File

@ -440,6 +440,9 @@ static ssize_t mode_store(struct device *dev,
else
config->vinst_ctrl &= ~BIT(11);
if (config->mode & (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER))
etm4_config_trace_mode(config);
spin_unlock(&drvdata->spinlock);
return size;

35
drivers/hwtracing/coresight/coresight-etm4x.c
View File

@ -566,6 +566,41 @@ static void etm4_set_default(struct etmv4_config *config)
config->vissctlr = 0x0;
}
void etm4_config_trace_mode(struct etmv4_config *config)
{
u32 addr_acc, mode;
mode = config->mode;
mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER);
/* excluding kernel AND user space doesn't make sense */
WARN_ON_ONCE(mode == (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER));
/* nothing to do if neither flags are set */
if (!(mode & ETM_MODE_EXCL_KERN) && !(mode & ETM_MODE_EXCL_USER))
return;
addr_acc = config->addr_acc[ETM_DEFAULT_ADDR_COMP];
/* clear default config */
addr_acc &= ~(ETM_EXLEVEL_NS_APP | ETM_EXLEVEL_NS_OS);
/*
* EXLEVEL_NS, bits[15:12]
* The Exception levels are:
* Bit[12] Exception level 0 - Application
* Bit[13] Exception level 1 - OS
* Bit[14] Exception level 2 - Hypervisor
* Bit[15] Never implemented
*/
if (mode & ETM_MODE_EXCL_KERN)
addr_acc |= ETM_EXLEVEL_NS_OS;
else
addr_acc |= ETM_EXLEVEL_NS_APP;
config->addr_acc[ETM_DEFAULT_ADDR_COMP] = addr_acc;
config->addr_acc[ETM_DEFAULT_ADDR_COMP + 1] = addr_acc;
}
static int etm4_cpu_callback(struct notifier_block *nfb, unsigned long action,
void *hcpu)
{

5
drivers/hwtracing/coresight/coresight-etm4x.h
View File

@ -176,7 +176,9 @@
#define ETM_MODE_TRACE_RESET BIT(25)
#define ETM_MODE_TRACE_ERR BIT(26)
#define ETM_MODE_VIEWINST_STARTSTOP BIT(27)
#define ETMv4_MODE_ALL 0xFFFFFFF
#define ETMv4_MODE_ALL (GENMASK(27, 0) | \
ETM_MODE_EXCL_KERN | \
ETM_MODE_EXCL_USER)
#define TRCSTATR_IDLE_BIT 0
#define ETM_DEFAULT_ADDR_COMP 0
@ -414,4 +416,5 @@ enum etm_addr_type {
};
extern const struct attribute_group *coresight_etmv4_groups[];
void etm4_config_trace_mode(struct etmv4_config *config);
#endif