On Wed, Aug 19, 2020 at 10:10:15PM +0100, Mike Leach wrote:
Moving from using an address filter to trace the default "all addresses" range to no filtering to acheive the same result, has caused the perf filtering of kernel/user address spaces from not working unless an explicit address filter was used.
This is due to the original code using a side-effect of the address filtering rather than setting the global TRCVICTLR exception level filtering.
The use of the mode sysfs file is also similarly affected.
A helper function is added to fix both instances.
Fixes: ae2041510d5d5 ("coresight: etmv4: Update default filter and initialisation") Reported-by: Leo Yan leo.yan@linaro.org Signed-off-by: Mike Leach mike.leach@linaro.org Reviewed-by: Leo Yan leo.yan@linaro.org Tested-by: Leo Yan leo.yan@linaro.org
Applied
Thanks, Mathieu
drivers/hwtracing/coresight/coresight-etm4x.c | 32 +++++++++++++------ drivers/hwtracing/coresight/coresight-etm4x.h | 3 ++ 2 files changed, 25 insertions(+), 10 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 8b0634ebef77..522ff5418a35 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -52,6 +52,7 @@ static struct etmv4_drvdata *etmdrvdata[NR_CPUS]; static void etm4_set_default_config(struct etmv4_config *config); static int etm4_set_event_filters(struct etmv4_drvdata *drvdata, struct perf_event *event); +static u64 etm4_get_access_type(struct etmv4_config *config); static enum cpuhp_state hp_online; @@ -783,6 +784,22 @@ static void etm4_init_arch_data(void *info) CS_LOCK(drvdata->base); } +/* Set ELx trace filter access in the TRCVICTLR register */ +static void etm4_set_victlr_access(struct etmv4_config *config) +{
- u64 access_type;
- config->vinst_ctrl &= ~(ETM_EXLEVEL_S_VICTLR_MASK | ETM_EXLEVEL_NS_VICTLR_MASK);
- /*
* TRCVICTLR::EXLEVEL_NS:EXLEVELS: Set kernel / user filtering* bits in vinst_ctrl, same bit pattern as TRCACATRn values returned by* etm4_get_access_type() but with a relative shift in this register.*/- access_type = etm4_get_access_type(config) << ETM_EXLEVEL_LSHIFT_TRCVICTLR;
- config->vinst_ctrl |= (u32)access_type;
+}
static void etm4_set_default_config(struct etmv4_config *config) { /* disable all events tracing */ @@ -800,6 +817,9 @@ static void etm4_set_default_config(struct etmv4_config *config) /* TRCVICTLR::EVENT = 0x01, select the always on logic */ config->vinst_ctrl = BIT(0);
- /* TRCVICTLR::EXLEVEL_NS:EXLEVELS: Set kernel / user filtering */
- etm4_set_victlr_access(config);
} static u64 etm4_get_ns_access_type(struct etmv4_config *config) @@ -1064,7 +1084,7 @@ static int etm4_set_event_filters(struct etmv4_drvdata *drvdata, void etm4_config_trace_mode(struct etmv4_config *config) {
- u32 addr_acc, mode;
- u32 mode;
mode = config->mode; mode &= (ETM_MODE_EXCL_KERN | ETM_MODE_EXCL_USER); @@ -1076,15 +1096,7 @@ void etm4_config_trace_mode(struct etmv4_config *config) 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 |
ETM_EXLEVEL_NS_HYP);- addr_acc |= etm4_get_ns_access_type(config);
- config->addr_acc[ETM_DEFAULT_ADDR_COMP] = addr_acc;
- config->addr_acc[ETM_DEFAULT_ADDR_COMP + 1] = addr_acc;
- etm4_set_victlr_access(config);
} static int etm4_online_cpu(unsigned int cpu) diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h index b8283e1d6d88..5259f96fd28a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.h +++ b/drivers/hwtracing/coresight/coresight-etm4x.h @@ -192,6 +192,9 @@ #define ETM_EXLEVEL_NS_HYP BIT(14) #define ETM_EXLEVEL_NS_NA BIT(15) +/* access level control in TRCVICTLR - same bits as TRCACATRn but shifted */ +#define ETM_EXLEVEL_LSHIFT_TRCVICTLR 8
/* secure / non secure masks - TRCVICTLR, IDR3 */ #define ETM_EXLEVEL_S_VICTLR_MASK GENMASK(19, 16) /* NS MON (EL3) mode never implemented */ -- 2.17.1