[RFC PATCH 01/12] coresight: Add RISC-V support to CoreSight tracing

[Zane Leung]

From: liangzhen <zhen.liang at spacemit.com>

Enable CoreSight tracing support on RISC-V architecture by:
- Adding RISC-V to Kconfig dependencies for CoreSight
- Replacing ARM-specific memory barriers (isb, dmb) with
  RISC-V equivalents (local_flush_icache_all, __mb)
- Removing ARM-specific header dependencies:
  perf/arm_pmu.h, asm/smp_plat.h
- Adding PMU format attribute macros for cross-architecture
  support

This allows CoreSight tracing infrastructure to work on RISC-V
systems while maintaining compatibility with existing ARM/ARM64
implementations.

Signed-off-by: liangzhen <zhen.liang at spacemit.com>
---
 drivers/hwtracing/Kconfig                     |  2 ++
 drivers/hwtracing/coresight/Kconfig           |  2 +-
 drivers/hwtracing/coresight/coresight-core.c  |  8 +++++++
 .../hwtracing/coresight/coresight-etm-perf.c  |  1 -
 .../hwtracing/coresight/coresight-etm-perf.h  | 21 +++++++++++++++++++
 .../hwtracing/coresight/coresight-platform.c  |  1 -
 .../hwtracing/coresight/coresight-tmc-etf.c   |  4 ++++
 .../hwtracing/coresight/coresight-tmc-etr.c   |  4 ++++
 8 files changed, 40 insertions(+), 3 deletions(-)

diff --git a/drivers/hwtracing/Kconfig b/drivers/hwtracing/Kconfig
index 911ee977103c..167ff172dd72 100644
--- a/drivers/hwtracing/Kconfig
+++ b/drivers/hwtracing/Kconfig
@@ -1,6 +1,8 @@
 # SPDX-License-Identifier: GPL-2.0-only
 menu "HW tracing support"
 
+source "drivers/hwtracing/coresight/Kconfig"
+
 source "drivers/hwtracing/stm/Kconfig"
 
 source "drivers/hwtracing/intel_th/Kconfig"
diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig
index 6a4239ebb582..2b1ebe3f614d 100644
--- a/drivers/hwtracing/coresight/Kconfig
+++ b/drivers/hwtracing/coresight/Kconfig
@@ -4,7 +4,7 @@
 #
 menuconfig CORESIGHT
 	tristate "CoreSight Tracing Support"
-	depends on ARM || ARM64
+	depends on ARM || ARM64 || RISCV
 	depends on OF || ACPI
 	select ARM_AMBA
 	select PERF_EVENTS
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index 80e26396ad0a..1ca202153cc4 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -141,7 +141,11 @@ static void coresight_set_self_claim_tag_unlocked(struct coresight_device *csdev
 {
 	csdev_access_relaxed_write32(&csdev->access, CORESIGHT_CLAIM_SELF_HOSTED,
 				     CORESIGHT_CLAIMSET);
+#if defined(__riscv)
+	local_flush_icache_all();
+#else
 	isb();
+#endif
 }
 
 void coresight_clear_self_claim_tag(struct csdev_access *csa)
@@ -158,7 +162,11 @@ void coresight_clear_self_claim_tag_unlocked(struct csdev_access *csa)
 {
 	csdev_access_relaxed_write32(csa, CORESIGHT_CLAIM_SELF_HOSTED,
 				     CORESIGHT_CLAIMCLR);
+#if defined(__riscv)
+	local_flush_icache_all();
+#else
 	isb();
+#endif
 }
 EXPORT_SYMBOL_GPL(coresight_clear_self_claim_tag_unlocked);
 
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.c b/drivers/hwtracing/coresight/coresight-etm-perf.c
index 72017dcc3b7f..70a6aaffbf9d 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.c
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.c
@@ -13,7 +13,6 @@
 #include <linux/mm.h>
 #include <linux/init.h>
 #include <linux/perf_event.h>
-#include <linux/perf/arm_pmu.h>
 #include <linux/percpu-defs.h>
 #include <linux/slab.h>
 #include <linux/stringhash.h>
diff --git a/drivers/hwtracing/coresight/coresight-etm-perf.h b/drivers/hwtracing/coresight/coresight-etm-perf.h
index 24d929428633..e48c0ad46db1 100644
--- a/drivers/hwtracing/coresight/coresight-etm-perf.h
+++ b/drivers/hwtracing/coresight/coresight-etm-perf.h
@@ -58,6 +58,27 @@ struct cscfg_config_desc;
 #define ATTR_CFG_FLD_cc_threshold_LO		0
 #define ATTR_CFG_FLD_cc_threshold_HI		11
 
+#define __GEN_PMU_FORMAT_ATTR(cfg, lo, hi)			\
+	(lo) == (hi) ? #cfg ":" #lo "\n" : #cfg ":" #lo "-" #hi
+
+#define _GEN_PMU_FORMAT_ATTR(cfg, lo, hi)			\
+	__GEN_PMU_FORMAT_ATTR(cfg, lo, hi)
+
+#define GEN_PMU_FORMAT_ATTR(name)				\
+	PMU_FORMAT_ATTR(name,					\
+	_GEN_PMU_FORMAT_ATTR(ATTR_CFG_FLD_##name##_CFG,		\
+			     ATTR_CFG_FLD_##name##_LO,		\
+			     ATTR_CFG_FLD_##name##_HI))
+
+#define _ATTR_CFG_GET_FLD(attr, cfg, lo, hi)			\
+	((((attr)->cfg) >> lo) & GENMASK_ULL(hi - lo, 0))
+
+#define ATTR_CFG_GET_FLD(attr, name)				\
+	_ATTR_CFG_GET_FLD(attr,					\
+			  ATTR_CFG_FLD_##name##_CFG,		\
+			  ATTR_CFG_FLD_##name##_LO,		\
+			  ATTR_CFG_FLD_##name##_HI)
+
 /**
  * struct etm_filter - single instruction range or start/stop configuration.
  * @start_addr:	The address to start tracing on.
diff --git a/drivers/hwtracing/coresight/coresight-platform.c b/drivers/hwtracing/coresight/coresight-platform.c
index 0db64c5f4995..261ba6a75b86 100644
--- a/drivers/hwtracing/coresight/coresight-platform.c
+++ b/drivers/hwtracing/coresight/coresight-platform.c
@@ -14,7 +14,6 @@
 #include <linux/amba/bus.h>
 #include <linux/coresight.h>
 #include <linux/cpumask.h>
-#include <asm/smp_plat.h>
 
 #include "coresight-priv.h"
 
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 8882b1c4cdc0..dc366f4a5ca8 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -661,7 +661,11 @@ static int tmc_panic_sync_etf(struct coresight_device *csdev)
 	 * Make sure all previous writes are ordered,
 	 * before we mark valid
 	 */
+#if defined(__riscv)
+	__mb();
+#else
 	dmb(sy);
+#endif
 	mdata->valid = true;
 	/*
 	 * Below order need to maintained, since crc of metadata
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 4dc1defe27a5..ac379d1751e6 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1883,7 +1883,11 @@ static int tmc_panic_sync_etr(struct coresight_device *csdev)
 	 * Make sure all previous writes are ordered,
 	 * before we mark valid
 	 */
+#if defined(__riscv)
+	__mb();
+#else
 	dmb(sy);
+#endif
 	mdata->valid = true;
 	/*
 	 * Below order need to maintained, since crc of metadata
-- 
2.34.1