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Commit 4f6fce54 authored by Mathieu Poirier's avatar Mathieu Poirier Committed by Greg Kroah-Hartman
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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: default avatarMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c38a9ec2

drivers/hwtracing/coresight/coresight-etm4x-sysfs.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

drivers/hwtracing/coresight/coresight-etm4x.c

+35 −0
Original line number Diff line number Diff line
@@ -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)

{

drivers/hwtracing/coresight/coresight-etm4x.h

+4 −1
Original line number Diff line number Diff line
@@ -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