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Message-Id: <20240220100924.2761706-8-james.clark@arm.com>
Date: Tue, 20 Feb 2024 10:09:17 +0000
From: James Clark <james.clark@....com>
To: coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.linux.dev,
maz@...nel.org,
suzuki.poulose@....com,
acme@...nel.org,
oliver.upton@...ux.dev,
broonie@...nel.org
Cc: James Clark <james.clark@....com>,
James Morse <james.morse@....com>,
Zenghui Yu <yuzenghui@...wei.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Mike Leach <mike.leach@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Anshuman Khandual <anshuman.khandual@....com>,
Miguel Luis <miguel.luis@...cle.com>,
Joey Gouly <joey.gouly@....com>,
Ard Biesheuvel <ardb@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Helge Deller <deller@....de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kalesh Singh <kaleshsingh@...gle.com>,
Vincent Donnefort <vdonnefort@...gle.com>,
Ryan Roberts <ryan.roberts@....com>,
Fuad Tabba <tabba@...gle.com>,
Jing Zhang <jingzhangos@...gle.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH v5 7/7] coresight: Pass guest TRFCR value to KVM
Currently the userspace and kernel filters for guests are never set, so
no trace will be generated for them. Add support for tracing guests by
passing the desired TRFCR value to KVM so it can be applied to the
guest.
By writing either E1TRE or E0TRE, filtering on either guest kernel or
guest userspace is also supported. And if both E1TRE and E0TRE are
cleared when exclude_guest is set, that option is supported too. This
change also brings exclude_host support which is difficult to add as a
separate commit without excess churn and resulting in no trace at all.
Testing
=======
The addresses were counted with the following:
$ perf report -D | grep -Eo 'EL2|EL1|EL0' | sort | uniq -c
Guest kernel only:
$ perf record -e cs_etm//Gk -a -- true
535 EL1
1 EL2
Guest user only (only 5 addresses because the guest runs slowly in the
model):
$ perf record -e cs_etm//Gu -a -- true
5 EL0
Host kernel only:
$ perf record -e cs_etm//Hk -a -- true
3501 EL2
Host userspace only:
$ perf record -e cs_etm//Hu -a -- true
408 EL0
1 EL2
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: James Clark <james.clark@....com>
---
.../coresight/coresight-etm4x-core.c | 42 ++++++++++++++++---
drivers/hwtracing/coresight/coresight-etm4x.h | 2 +-
drivers/hwtracing/coresight/coresight-priv.h | 3 ++
3 files changed, 40 insertions(+), 7 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index ce1995a2827f..45a69bfdc6b5 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -6,6 +6,7 @@
#include <linux/acpi.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
+#include <linux/kvm_host.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/types.h>
@@ -271,9 +272,22 @@ static void etm4x_prohibit_trace(struct etmv4_drvdata *drvdata)
/* If the CPU doesn't support FEAT_TRF, nothing to do */
if (!drvdata->trfcr)
return;
+ kvm_etm_set_guest_trfcr(0);
cpu_prohibit_trace();
}
+static u64 etm4x_get_kern_user_filter(struct etmv4_drvdata *drvdata)
+{
+ u64 trfcr = drvdata->trfcr;
+
+ if (drvdata->config.mode & ETM_MODE_EXCL_KERN)
+ trfcr &= ~TRFCR_ELx_ExTRE;
+ if (drvdata->config.mode & ETM_MODE_EXCL_USER)
+ trfcr &= ~TRFCR_ELx_E0TRE;
+
+ return trfcr;
+}
+
/*
* etm4x_allow_trace - Allow CPU tracing in the respective ELs,
* as configured by the drvdata->config.mode for the current
@@ -286,18 +300,28 @@ static void etm4x_prohibit_trace(struct etmv4_drvdata *drvdata)
*/
static void etm4x_allow_trace(struct etmv4_drvdata *drvdata)
{
- u64 trfcr = drvdata->trfcr;
+ u64 trfcr;
/* If the CPU doesn't support FEAT_TRF, nothing to do */
- if (!trfcr)
+ if (!drvdata->trfcr)
return;
- if (drvdata->config.mode & ETM_MODE_EXCL_KERN)
- trfcr &= ~TRFCR_ELx_ExTRE;
- if (drvdata->config.mode & ETM_MODE_EXCL_USER)
- trfcr &= ~TRFCR_ELx_E0TRE;
+ if (drvdata->config.mode & ETM_MODE_EXCL_HOST)
+ trfcr = drvdata->trfcr & ~(TRFCR_ELx_ExTRE | TRFCR_ELx_E0TRE);
+ else
+ trfcr = etm4x_get_kern_user_filter(drvdata);
write_trfcr(trfcr);
+
+ /* Set filters for guests and pass to KVM */
+ if (drvdata->config.mode & ETM_MODE_EXCL_GUEST)
+ trfcr = drvdata->trfcr & ~(TRFCR_ELx_ExTRE | TRFCR_ELx_E0TRE);
+ else
+ trfcr = etm4x_get_kern_user_filter(drvdata);
+
+ /* TRFCR_EL1 doesn't have CX so mask it out. */
+ trfcr &= ~TRFCR_EL2_CX;
+ kvm_etm_set_guest_trfcr(trfcr);
}
#ifdef CONFIG_ETM4X_IMPDEF_FEATURE
@@ -655,6 +679,12 @@ static int etm4_parse_event_config(struct coresight_device *csdev,
if (attr->exclude_user)
config->mode = ETM_MODE_EXCL_USER;
+ if (attr->exclude_host)
+ config->mode |= ETM_MODE_EXCL_HOST;
+
+ if (attr->exclude_guest)
+ config->mode |= ETM_MODE_EXCL_GUEST;
+
/* Always start from the default config */
etm4_set_default_config(config);
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index da17b6c49b0f..70c29e91f4b5 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -841,7 +841,7 @@ enum etm_impdef_type {
* @s_ex_level: Secure ELs where tracing is supported.
*/
struct etmv4_config {
- u32 mode;
+ u64 mode;
u32 pe_sel;
u32 cfg;
u32 eventctrl0;
diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
index 767076e07970..727dd27ba800 100644
--- a/drivers/hwtracing/coresight/coresight-priv.h
+++ b/drivers/hwtracing/coresight/coresight-priv.h
@@ -39,6 +39,9 @@
#define ETM_MODE_EXCL_KERN BIT(30)
#define ETM_MODE_EXCL_USER BIT(31)
+#define ETM_MODE_EXCL_HOST BIT(32)
+#define ETM_MODE_EXCL_GUEST BIT(33)
+
struct cs_pair_attribute {
struct device_attribute attr;
u32 lo_off;
--
2.34.1
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