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From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org
Cc: mathieu.poirier@linaro.org, suzuki.poulose@arm.com,
	mike.leach@linaro.org, lcherian@marvell.com,
	linux-kernel@vger.kernel.org,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>
Subject: [PATCH V3 10/14] arm64: nvhe: Allow TRBE access at EL1
Date: Wed, 27 Jan 2021 14:25:34 +0530	[thread overview]
Message-ID: <1611737738-1493-11-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1611737738-1493-1-git-send-email-anshuman.khandual@arm.com>

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

When the kernel is booted at EL2 in a nvhe configuration,
enable the TRBE access to the EL1. The EL1 still can't trace
EL2, unless EL2 permits explicitly via TRFCR_EL2.E2TRE.

Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
cc: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/include/asm/el2_setup.h | 19 +++++++++++++++++++
 arch/arm64/include/asm/kvm_arm.h   |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index a7f5a1b..05ecce9 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -72,6 +72,25 @@
 .endif
 
 3:
+
+.ifeqs	"\mode", "nvhe"
+	/*
+	 * If the Trace Buffer is available, allow
+	 * the EL1 to own it. Note that EL1 cannot
+	 * trace the EL2, as it is prevented by
+	 * TRFCR_EL2.E2TRE == 0.
+	 */
+	ubfx	x0, x1, #ID_AA64DFR0_TRBE_SHIFT, #4
+	cbz	x0, 1f
+
+	mrs_s	x0, SYS_TRBIDR_EL1
+	and	x0, x0, TRBIDR_PROG
+	cbnz	x0, 1f
+	mov	x0, #(MDCR_EL2_E2TB_EL1_OWN << MDCR_EL2_E2TB_SHIFT)
+	orr	x2, x2, x0
+.endif
+
+1:
 	msr	mdcr_el2, x2			// Configure debug traps
 .endm
 
diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 4e90c2d..ed8b789 100644
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -281,6 +281,8 @@
 #define MDCR_EL2_TPMS		(1 << 14)
 #define MDCR_EL2_E2PB_MASK	(UL(0x3))
 #define MDCR_EL2_E2PB_SHIFT	(UL(12))
+#define MDCR_EL2_E2TB_EL1_OWN	(UL(0x3))
+#define MDCR_EL2_E2TB_SHIFT	(UL(24))
 #define MDCR_EL2_TDRA		(1 << 11)
 #define MDCR_EL2_TDOSA		(1 << 10)
 #define MDCR_EL2_TDA		(1 << 9)
-- 
2.7.4


  parent reply	other threads:[~2021-01-27  9:52 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-27  8:55 [PATCH V3 00/14] arm64: coresight: Enable ETE and TRBE Anshuman Khandual
2021-01-27  8:55 ` [PATCH V3 01/14] coresight: etm-perf: Allow an event to use different sinks Anshuman Khandual
2021-02-01 23:17   ` Mathieu Poirier
2021-02-02  9:42     ` Suzuki K Poulose
2021-02-02 16:33       ` Mike Leach
2021-02-02 22:41         ` Suzuki K Poulose
2021-02-04 12:27           ` Mike Leach
2021-02-02 16:37       ` Mathieu Poirier
2021-01-27  8:55 ` [PATCH V3 02/14] coresight: Do not scan for graph if none is present Anshuman Khandual
2021-02-01 23:44   ` Mathieu Poirier
2021-02-02 11:10   ` Mike Leach
2021-02-02 14:36     ` Suzuki K Poulose
2021-01-27  8:55 ` [PATCH V3 03/14] coresight: etm4x: Add support for PE OS lock Anshuman Khandual
2021-02-02 17:40   ` Mathieu Poirier
2021-02-02 18:03   ` Mathieu Poirier
2021-02-15 14:08   ` Mike Leach
2021-01-27  8:55 ` [PATCH V3 04/14] coresight: ete: Add support for ETE sysreg access Anshuman Khandual
2021-02-02 17:52   ` Mathieu Poirier
2021-02-03 15:51     ` Suzuki K Poulose
2021-02-15 14:08   ` Mike Leach
2021-01-27  8:55 ` [PATCH V3 05/14] coresight: ete: Add support for ETE tracing Anshuman Khandual
2021-02-02 18:56   ` Mathieu Poirier
2021-02-02 22:50     ` Suzuki K Poulose
2021-02-15 13:21     ` Mike Leach
2021-02-15 14:08       ` Mike Leach
2021-01-27  8:55 ` [PATCH V3 06/14] dts: bindings: Document device tree bindings for ETE Anshuman Khandual
2021-02-09 19:00   ` Rob Herring
2021-02-10 12:33     ` Suzuki K Poulose
2021-02-18 18:33       ` Rob Herring
2021-02-18 22:51         ` Suzuki K Poulose
2021-01-27  8:55 ` [PATCH V3 07/14] coresight: etm-perf: Handle stale output handles Anshuman Khandual
2021-02-03 19:05   ` Mathieu Poirier
2021-02-03 23:36     ` Suzuki K Poulose
2021-02-15 16:27   ` Mike Leach
2021-01-27  8:55 ` [PATCH V3 08/14] coresight: core: Add support for dedicated percpu sinks Anshuman Khandual
2021-01-28  9:16   ` Suzuki K Poulose
2021-02-04 18:34     ` Mathieu Poirier
2021-02-16 10:40       ` Anshuman Khandual
2021-02-16 20:44         ` Mathieu Poirier
2021-02-16 10:21     ` Anshuman Khandual
2021-02-15 16:27   ` Mike Leach
2021-02-15 16:56     ` Mathieu Poirier
2021-02-15 17:58       ` Mike Leach
2021-02-16 20:30         ` Mathieu Poirier
2021-01-27  8:55 ` [PATCH V3 09/14] arm64: Add TRBE definitions Anshuman Khandual
2021-01-28  9:31   ` Suzuki K Poulose
2021-01-28 17:18   ` Catalin Marinas
2021-02-15 18:06     ` Mike Leach
2021-01-27  8:55 ` Anshuman Khandual [this message]
2021-01-27  9:58   ` [PATCH V3 10/14] arm64: nvhe: Allow TRBE access at EL1 Marc Zyngier
2021-01-28  9:34     ` Suzuki K Poulose
2021-01-28  9:46       ` Marc Zyngier
2021-01-28  9:48         ` Suzuki K Poulose
2021-01-27  8:55 ` [PATCH V3 11/14] coresight: sink: Add TRBE driver Anshuman Khandual
     [not found]   ` <12cdc8ca-0a69-bfba-bbcd-fb392d6ca051@arm.com>
2021-02-02  5:55     ` Anshuman Khandual
2021-02-05 17:53   ` Mathieu Poirier
2021-02-08  4:20     ` Anshuman Khandual
2021-02-09 17:39     ` Mathieu Poirier
2021-02-10  4:12       ` Anshuman Khandual
2021-02-10 16:54         ` Mathieu Poirier
2021-02-10 19:00   ` Mathieu Poirier
2021-02-12  5:43     ` Anshuman Khandual
2021-02-12 17:02       ` Mathieu Poirier
2021-02-11 19:00   ` Mathieu Poirier
2021-02-12  3:31     ` Anshuman Khandual
2021-02-12 16:57       ` Mathieu Poirier
2021-02-15  9:26         ` Anshuman Khandual
2021-02-12 20:26   ` Mathieu Poirier
2021-02-15  9:46     ` Anshuman Khandual
2021-02-16  9:00       ` Mike Leach
2021-02-16  9:44         ` Anshuman Khandual
2021-02-16 12:12           ` Mike Leach
2021-02-18  7:50         ` Suzuki K Poulose
2021-02-18 14:30           ` Mike Leach
2021-02-18 15:14             ` Suzuki K Poulose
2021-02-22 10:42               ` Mike Leach
2021-01-27  8:55 ` [PATCH V3 12/14] dts: bindings: Document device tree bindings for Arm TRBE Anshuman Khandual
2021-02-09 19:04   ` Rob Herring
2021-01-27  8:55 ` [PATCH V3 13/14] perf: aux: Add flags for the buffer format Anshuman Khandual
2021-01-27 12:51   ` Peter Zijlstra
2021-02-16 10:59   ` Mike Leach
2021-01-27  8:55 ` [PATCH V3 14/14] coresight: etm-perf: Add support for trace " Anshuman Khandual
2021-01-27 12:54   ` Peter Zijlstra
2021-01-27 13:00     ` Al Grant
2021-02-18  3:05       ` Anshuman Khandual
2021-01-27 14:12     ` Suzuki K Poulose
2021-02-16 11:01   ` Mike Leach
2021-01-27 18:50 ` [PATCH V3 00/14] arm64: coresight: Enable ETE and TRBE Mathieu Poirier
2021-02-01 18:44 ` Mathieu Poirier
2021-02-18  4:23   ` Anshuman Khandual

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