diff options
| author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-04-05 20:53:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-02 00:12:14 +0300 |
| commit | 4f6fce54528e0382281cf199635d098e4b108357 (patch) | |
| tree | dbb8047834bae2ffff4c86813fa5c2d8991d4285 /drivers/hwtracing | |
| parent | c38a9ec2b2c12c38abca0b7954ed793f26969835 (diff) | |
| download | linux-4f6fce54528e0382281cf199635d098e4b108357.tar.xz | |
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>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 3 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.c | 35 | ||||
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.h | 5 |
3 files changed, 42 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c index a996db7ef2fc..0e80ec668402 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -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; diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 9f51a8f47650..88b8bc0f6549 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -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) { diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index f7748ae63451..a291d4cc8bd8 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -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 |