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authorTomasz Nowicki <tnowicki@caviumnetworks.com>2018-09-20 13:18:00 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-25 20:09:18 +0200
commitb860801e3237ec4c74cf8de0be4816996757ae5c (patch)
treee80b40f0c22c108f1afeaaf1243e129c6ccec6aa /drivers/hwtracing
parentd4989fe88603367e5998af70ee638ae6790d42d1 (diff)
coresight: etm4x: Configure EL2 exception level when kernel is running in HYP
For non-VHE systems host kernel runs at EL1 and jumps to EL2 whenever hypervisor code should be executed. In this case ETM4x driver must restrict configuration to EL1 when it setups kernel tracing. However, there is no separate hypervisor privilege level when VHE is enabled, the host kernel runs at EL2. This patch fixes configuration of TRCACATRn register for VHE systems so that ETM_EXLEVEL_NS_HYP bit is used instead of ETM_EXLEVEL_NS_OS to on/off kernel tracing. At the same time, it moves common code to new helper. Signed-off-by: Tomasz Nowicki <tnowicki@caviumnetworks.com> 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.c40
1 files changed, 20 insertions, 20 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index c1dcc7c289a5..b7379e9cfb30 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -28,6 +28,7 @@
#include <linux/pm_runtime.h>
#include <asm/sections.h>
#include <asm/local.h>
+#include <asm/virt.h>
#include "coresight-etm4x.h"
#include "coresight-etm-perf.h"
@@ -605,7 +606,7 @@ static void etm4_set_default_config(struct etmv4_config *config)
config->vinst_ctrl |= BIT(0);
}
-static u64 etm4_get_access_type(struct etmv4_config *config)
+static u64 etm4_get_ns_access_type(struct etmv4_config *config)
{
u64 access_type = 0;
@@ -616,17 +617,26 @@ static u64 etm4_get_access_type(struct etmv4_config *config)
* Bit[13] Exception level 1 - OS
* Bit[14] Exception level 2 - Hypervisor
* Bit[15] Never implemented
- *
- * Always stay away from hypervisor mode.
*/
- access_type = ETM_EXLEVEL_NS_HYP;
-
- if (config->mode & ETM_MODE_EXCL_KERN)
- access_type |= ETM_EXLEVEL_NS_OS;
+ if (!is_kernel_in_hyp_mode()) {
+ /* Stay away from hypervisor mode for non-VHE */
+ access_type = ETM_EXLEVEL_NS_HYP;
+ if (config->mode & ETM_MODE_EXCL_KERN)
+ access_type |= ETM_EXLEVEL_NS_OS;
+ } else if (config->mode & ETM_MODE_EXCL_KERN) {
+ access_type = ETM_EXLEVEL_NS_HYP;
+ }
if (config->mode & ETM_MODE_EXCL_USER)
access_type |= ETM_EXLEVEL_NS_APP;
+ return access_type;
+}
+
+static u64 etm4_get_access_type(struct etmv4_config *config)
+{
+ u64 access_type = etm4_get_ns_access_type(config);
+
/*
* EXLEVEL_S, bits[11:8], don't trace anything happening
* in secure state.
@@ -880,20 +890,10 @@ void etm4_config_trace_mode(struct etmv4_config *config)
addr_acc = config->addr_acc[ETM_DEFAULT_ADDR_COMP];
/* clear default config */
- addr_acc &= ~(ETM_EXLEVEL_NS_APP | ETM_EXLEVEL_NS_OS);
+ addr_acc &= ~(ETM_EXLEVEL_NS_APP | ETM_EXLEVEL_NS_OS |
+ ETM_EXLEVEL_NS_HYP);
- /*
- * 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;
+ 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;