linux-kernel - [PATCH 17/31] coresight: etm4x: Cleanup secure exception level masks

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Date:   Mon,  1 Feb 2021 11:13:37 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     gregkh@...uxfoundation.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 17/31] coresight: etm4x: Cleanup secure exception level masks

From: Suzuki K Poulose <suzuki.poulose@....com>

We rely on the ETM architecture version to decide whether
Secure EL2 is available on the CPU for excluding the level
for address comparators and viewinst main control register.
We must instead use the TRCDIDR3.EXLEVEL_S field to detect
the supported levels.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
Link: https://lore.kernel.org/r/20210110224850.1880240-16-suzuki.poulose@arm.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/hwtracing/coresight/coresight-etm4x-core.c | 13 +++----------
 drivers/hwtracing/coresight/coresight-etm4x.h      |  6 ++++--
 2 files changed, 7 insertions(+), 12 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index f095ab9949d9..d91b259a4334 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -840,7 +840,6 @@ static void etm4_init_arch_data(void *info)
 	 * TRCARCHMAJ, bits[11:8] architecture major versin number
 	 */
 	drvdata->arch = BMVAL(etmidr1, 4, 11);
-	drvdata->config.arch = drvdata->arch;
 
 	/* maximum size of resources */
 	etmidr2 = etm4x_relaxed_read32(csa, TRCIDR2);
@@ -856,6 +855,7 @@ static void etm4_init_arch_data(void *info)
 	drvdata->ccitmin = BMVAL(etmidr3, 0, 11);
 	/* EXLEVEL_S, bits[19:16] Secure state instruction tracing */
 	drvdata->s_ex_level = BMVAL(etmidr3, 16, 19);
+	drvdata->config.s_ex_level = drvdata->s_ex_level;
 	/* EXLEVEL_NS, bits[23:20] Non-secure state instruction tracing */
 	drvdata->ns_ex_level = BMVAL(etmidr3, 20, 23);
 
@@ -1027,16 +1027,9 @@ static u64 etm4_get_ns_access_type(struct etmv4_config *config)
 static u64 etm4_get_access_type(struct etmv4_config *config)
 {
 	u64 access_type = etm4_get_ns_access_type(config);
-	u64 s_hyp = (config->arch & 0x0f) >= 0x4 ? ETM_EXLEVEL_S_HYP : 0;
 
-	/*
-	 * EXLEVEL_S, bits[11:8], don't trace anything happening
-	 * in secure state.
-	 */
-	access_type |= (ETM_EXLEVEL_S_APP	|
-			ETM_EXLEVEL_S_OS	|
-			s_hyp			|
-			ETM_EXLEVEL_S_MON);
+	/* All supported secure ELs are excluded */
+	access_type |= (u64)config->s_ex_level << TRCACATR_EXLEVEL_SHIFT;
 
 	return access_type;
 }
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index fba3c02eea0b..29cd27f53e72 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -557,6 +557,8 @@
 /* PowerDown Control Register bits */
 #define TRCPDCR_PU			BIT(3)
 
+#define TRCACATR_EXLEVEL_SHIFT		8
+
 /* secure state access levels - TRCACATRn */
 #define ETM_EXLEVEL_S_APP		BIT(8)
 #define ETM_EXLEVEL_S_OS		BIT(9)
@@ -631,7 +633,7 @@ enum etm_impdef_type {
  * @vmid_mask0:	VM ID comparator mask for comparator 0-3.
  * @vmid_mask1:	VM ID comparator mask for comparator 4-7.
  * @ext_inp:	External input selection.
- * @arch:	ETM architecture version (for arch dependent config).
+ * @s_ex_level: Secure ELs where tracing is supported.
  */
 struct etmv4_config {
 	u32				mode;
@@ -675,7 +677,7 @@ struct etmv4_config {
 	u32				vmid_mask0;
 	u32				vmid_mask1;
 	u32				ext_inp;
-	u8				arch;
+	u8				s_ex_level;
 };
 
 /**
-- 
2.25.1