From: Zane Leung <liangzhen@linux.spacemit.com>
To: gregkh@linuxfoundation.org, palmer@dabbelt.com, pjw@kernel.org,
alexander.shishkin@linux.intel.com, suzuki.poulose@arm.com,
mchitale@gmail.com, anup@brainfault.org, irogers@google.com
Cc: mike.leach@arm.com, james.clark@linaro.org, leo.yan@arm.com,
peterz@infradead.org, mingo@redhat.com, namhyung@kernel.org,
mark.rutland@arm.com, jolsa@kernel.org, adrian.hunter@intel.com,
alex@ghiti.fr, atish.patra@linux.dev,
andrew.jones@oss.qualcomm.com, sunilvl@oss.qualcomm.com,
liangzhen@linux.spacemit.com, zhuangqiubin@linux.spacemit.com,
coresight@lists.linaro.org, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 06/24] gtrace: Replace owner PID with perf_event pointer in gtrace_path
Date: Fri, 23 Oct 2026 11:14:47 +0800 [thread overview]
Message-ID: <20261023031505.2020925-7-liangzhen@linux.spacemit.com> (raw)
In-Reply-To: <20261023031505.2020925-1-liangzhen@linux.spacemit.com>
Replace 'pid_t owner' with 'struct perf_event *event' in struct gtrace_path.
This allows component drivers to directly access the perf_event for PMU
configuration.
Signed-off-by: Zane Leung <liangzhen@linux.spacemit.com>
---
drivers/hwtracing/gtrace/gtrace-core.c | 12 ++++++++++--
drivers/hwtracing/gtrace/gtrace-perf.c | 2 +-
include/linux/gtrace.h | 2 +-
3 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/hwtracing/gtrace/gtrace-core.c b/drivers/hwtracing/gtrace/gtrace-core.c
index cae0a7fa820f..3f55d8b7302d 100644
--- a/drivers/hwtracing/gtrace/gtrace-core.c
+++ b/drivers/hwtracing/gtrace/gtrace-core.c
@@ -13,6 +13,7 @@
#include <linux/spinlock.h>
#include <linux/xarray.h>
#include <linux/gtrace.h>
+#include <linux/perf_event.h>
#define GTRACE_POLL_TIMEOUT_US_DEFAULT 10
@@ -665,10 +666,16 @@ static int __gtrace_comp_start(struct gtrace_component *comp,
raw_spin_lock_irqsave(&cpriv->lock, flags);
if (cpriv->start_count) {
- if (cpriv->owner != path->owner || cpriv->mode != path->mode) {
+ if (cpriv->mode != path->mode) {
ret = -EBUSY;
goto out;
}
+ if (cpriv->mode == GTRACE_COMPONENT_MODE_PERF) {
+ if (cpriv->owner != task_pid_nr(path->event->owner)) {
+ ret = -EBUSY;
+ goto out;
+ }
+ }
} else {
if (gtdrv->start) {
comp->path = path;
@@ -678,8 +685,9 @@ static int __gtrace_comp_start(struct gtrace_component *comp,
goto out;
}
}
- cpriv->owner = path->owner;
cpriv->mode = path->mode;
+ if (cpriv->mode == GTRACE_COMPONENT_MODE_PERF)
+ cpriv->owner = task_pid_nr(path->event->owner);
}
cpriv->start_count++;
diff --git a/drivers/hwtracing/gtrace/gtrace-perf.c b/drivers/hwtracing/gtrace/gtrace-perf.c
index 703c12b95665..2fcfbae9acf6 100644
--- a/drivers/hwtracing/gtrace/gtrace-perf.c
+++ b/drivers/hwtracing/gtrace/gtrace-perf.c
@@ -137,7 +137,7 @@ static void *gtrace_setup_aux(struct perf_event *event, void **pages,
continue;
}
- path->owner = task_pid_nr(event->owner);
+ path->event = event;
*gtrace_event_cpu_path_ptr(event_data, cpu) = path;
}
diff --git a/include/linux/gtrace.h b/include/linux/gtrace.h
index 76b1aa9cfe79..3d769b405030 100644
--- a/include/linux/gtrace.h
+++ b/include/linux/gtrace.h
@@ -325,7 +325,7 @@ struct gtrace_path {
enum gtrace_component_mode mode;
u32 trace_id;
#define GTRACE_INVALID_TRACE_ID 0
- pid_t owner;
+ struct perf_event *event;
};
struct gtrace_component *gtrace_path_source(struct gtrace_path *path);
--
2.34.1
next prev parent reply other threads:[~2026-10-23 3:15 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-23 3:14 [RFC PATCH 00/24] Add Linux RISC-V trace support via the gtrace framework Zane Leung
2026-10-23 3:14 ` [PATCH 01/24] gtrace: Move connection release into component unregister Zane Leung
2026-10-23 3:14 ` [PATCH 02/24] gtrace: Initial implementation of gtrace sysfs framework Zane Leung
2026-10-23 3:14 ` [PATCH 03/24] gtrace: Drop trace format field and helper function Zane Leung
2026-10-23 3:14 ` [PATCH 04/24] gtrace: Add RISC-V trace encoder sysfs support Zane Leung
2026-10-23 3:14 ` [PATCH 05/24] gtrace: Introduce some PMU format attributes Zane Leung
2026-10-23 3:14 ` Zane Leung [this message]
2026-10-23 3:14 ` [PATCH 07/24] gtrace: Parse RISC-V Trace encoder config from perf event Zane Leung
2026-10-23 3:14 ` [PATCH 08/24] gtrace: add perf symlink support for gtrace components Zane Leung
2026-10-23 3:14 ` [PATCH 09/24] gtrace: Add port-level start/stop driver callbacks Zane Leung
2026-10-23 3:14 ` [PATCH 10/24] gtrace: Add RISC-V trace funnel driver Zane Leung
2026-10-23 3:14 ` [PATCH 11/24] gtrace: Add RISC-V trace timestamp support Zane Leung
2026-10-23 3:14 ` [PATCH 12/24] gtrace: Add RISC-V trace ATB bridge driver Zane Leung
2026-10-23 3:14 ` [PATCH 13/24] gtrace: Add CoreSight platform core APIs Zane Leung
2026-10-23 3:14 ` [PATCH 14/24] gtrace: Add CoreSight funnel driver Zane Leung
2026-10-23 3:14 ` [PATCH 15/24] gtrace: Only copy AUX data from the path sink Zane Leung
2026-10-23 3:14 ` [PATCH 16/24] perf: Flag whether gtrace AUX data carries CoreSight framing Zane Leung
2026-10-23 3:14 ` [PATCH 17/24] gtrace: Unify default sink selection across CPUs in perf setup Zane Leung
2026-10-23 3:14 ` [PATCH 18/24] gtrace: Add sink-specific buffer alloc/free callbacks Zane Leung
2026-10-23 3:15 ` [PATCH 19/24] gtrace: Add setup_sysfs_buf callback to setup sysfs sink buffer Zane Leung
2026-10-23 3:15 ` [PATCH 20/24] gtrace: Add CoreSight TMC driver support Zane Leung
2026-10-23 3:15 ` [PATCH 21/24] perf tools: riscv: making gtrace PMU listable Zane Leung
2026-10-23 3:15 ` [PATCH 22/24] perf tools: Add Nexus RISC-V Trace decoder Zane Leung
2026-10-23 3:15 ` [PATCH 23/24] perf tools: gtrace: Record and parse trace encoder metadata Zane Leung
2026-10-23 3:15 ` [PATCH 24/24] perf tools: gtrace: Add AUX trace decoder and branch sample synthesis Zane Leung
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