From patchwork Mon Feb 3 00:42:54 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring (Arm)" X-Patchwork-Id: 13956710 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3270DC0218F for ; Mon, 3 Feb 2025 00:46:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To: Content-Transfer-Encoding:Content-Type:MIME-Version:Message-Id:Date:Subject: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=Tg8eDo7UKV6ed9vqJV5ktxKdcgRphN2n4W2yj5MxTQo=; b=1e83M7tEnYJiQ6 RtYsfXsXQzX4zmzZneO0hgmSC32xVXXHksjvlDXdUteUKQgMq5Ittw12dXTRjqVAyMyaiIlckG9c/ 5torSPxW8xXYEB21YMXIFK8LkCMIv67OOM4+6uLkz2xf7/BdF1ldu/ieIITMe3utgUjOYzEXUleOU deiZN5fxH3ChqidbT1/fovAF1koSq/9OOEWwWjxNfRd6AVewIo0TsHHYF5z77kycJ96Lqb1ThTMdD Wsh99DLIO7XGuKOtwZRg2NA+PFDcXSxBVMRygg/yGKVKqWjVjJ8jxxitkvSWrkoY7RCFuHSTUNE6f X+vy/RJ36puE/8GspQ6Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tekbD-0000000EM0j-0sMb; Mon, 03 Feb 2025 00:46:03 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tekYZ-0000000ELIu-2XJq for linux-arm-kernel@lists.infradead.org; Mon, 03 Feb 2025 00:43:20 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 6562D5C5E51; Mon, 3 Feb 2025 00:42:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84CA5C4CED1; Mon, 3 Feb 2025 00:43:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1738543396; bh=GpuZv6X9a6Iwav9fDexP5CTqJHFoGKqBKJpUPFkjJQs=; h=From:Subject:Date:To:Cc:From; b=TwN2gbFcustSVQowbpDiSu3hDdQ5n7MYCaOg3+uUa6Ar/XcJBfkMu1jb2OgKVD/Q4 s7BYp78utgencj8QXwYswiRUQ3IbwABey4810SZvhuV7woxFX9znp4UbvaAcco3VTg pz3iNYNj7T8fEMQdExBXZNsaJO2oBRxRMInAKx5rk8iqaTOqJeisTpaFc0dDDlECr3 2wgajwRkIsUSDibsQEEI1QtBLukE5o5oK3Y79bT0Q6pxdTTBfTt+QHT9SWuxMVHPA4 5enNChqZ4+ypGpoBfytmoPcqGJ3b7p+4ZVifBnlBnNh7lKl8XEx6V7rsgmfNQrM+Ai FXjKZHaTDvMiw== From: "Rob Herring (Arm)" Subject: [PATCH v19 00/11] arm64/perf: Enable branch stack sampling Date: Sun, 02 Feb 2025 18:42:54 -0600 Message-Id: <20250202-arm-brbe-v19-v19-0-1c1300802385@kernel.org> MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAA4RoGcC/x2MQQqAMAzAviI9W3DVCfMr4mG6qj04pQMRhn93e EwgyZBYhRMMVQblW5KcsYBxdQXL7uPGKKEIoIZsY8ih1wNnnRlv45C6YINjyz21UJJLeZXn/43 T+34amuVzXwAAAA== X-Change-ID: 20250129-arm-brbe-v19-24d5d9e5e623 To: Will Deacon , Mark Rutland , Catalin Marinas , Jonathan Corbet , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , James Clark , Anshuman Khandual Cc: linux-arm-kernel@lists.infradead.org, linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, Mark Brown X-Mailer: b4 0.15-dev X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250202_164319_735957_FEDFFFA8 X-CRM114-Status: GOOD ( 15.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This series enables perf branch stack sampling support on arm64 via a v9.2 arch feature called Branch Record Buffer Extension (BRBE). Details on BRBE can be found in the Arm ARM[1] chapter D18. I've picked up this series from Anshuman. This version has been reworked quite a bit by Mark and myself. The bulk of those changes are in patch 11. Patches 1-7 are new clean-ups/prep which stand on their own. They were previously posted here[2]. Please pick them up if there's no issues with them. Patches 8-11 add BRBE support with the actual support in patch 11. [1] https://developer.arm.com/documentation/ddi0487/latest/ [2] https://lore.kernel.org/all/20250107-arm-pmu-cleanups-v1-v1-0-313951346a25@kernel.org/ v19: - Drop saving of branch records when task scheduled out (Mark). Make sched_task() callback actually get called. Enabling requires a call to perf_sched_cb_inc(). So the saving of branch records never happened. - Got rid of added armpmu ops. All BRBE support is contained within pmuv3 code. - Fix freeze on overflow for VHE - The cycle counter doesn't freeze BRBE on overflow, so avoid assigning it when BRBE is enabled. - Drop all the Arm specific exception branches. Not a clear need for them. - Fix handling of branch 'cycles' reading. CC field is mantissa/exponent, not an integer. - Rework s/w filtering to better match h/w filtering - Reject events with disjoint event filter and branch filter or with exclude_host set - Dropped perf test patch which has been applied for 6.14 - Dropped patch "KVM: arm64: Explicitly handle BRBE traps as UNDEFINED" which has been applied for 6.14 v18: - https://lore.kernel.org/all/20240613061731.3109448-1-anshuman.khandual@arm.com/ For v1-v17, see the above link. Not going to duplicate it all here... Signed-off-by: "Rob Herring (Arm)" --- Anshuman Khandual (4): arm64/sysreg: Add BRBE registers and fields arm64: Handle BRBE booting requirements KVM: arm64: nvhe: Disable branch generation in nVHE guests perf: arm_pmuv3: Add support for the Branch Record Buffer Extension (BRBE) Mark Rutland (3): perf: arm_pmu: Don't disable counter in armpmu_add() perf: arm_pmuv3: Don't disable counter in armv8pmu_enable_event() perf: arm_pmu: Move PMUv3-specific data Rob Herring (Arm) (4): perf: arm_pmuv3: Call kvm_vcpu_pmu_resync_el0() before enabling counters perf: arm_v7_pmu: Drop obvious comments for enabling/disabling counters and interrupts perf: arm_v7_pmu: Don't disable counter in (armv7|krait_|scorpion_)pmu_enable_event() perf: apple_m1: Don't disable counter in m1_pmu_enable_event() Documentation/arch/arm64/booting.rst | 21 + arch/arm64/include/asm/el2_setup.h | 86 +++- arch/arm64/include/asm/kvm_host.h | 2 + arch/arm64/include/asm/sysreg.h | 17 +- arch/arm64/kvm/debug.c | 4 + arch/arm64/kvm/hyp/nvhe/debug-sr.c | 32 ++ arch/arm64/tools/sysreg | 132 ++++++ drivers/perf/Kconfig | 11 + drivers/perf/Makefile | 1 + drivers/perf/apple_m1_cpu_pmu.c | 4 - drivers/perf/arm_brbe.c | 794 +++++++++++++++++++++++++++++++++++ drivers/perf/arm_brbe.h | 47 +++ drivers/perf/arm_pmu.c | 23 +- drivers/perf/arm_pmuv3.c | 96 ++++- drivers/perf/arm_v7_pmu.c | 50 --- include/linux/perf/arm_pmu.h | 21 +- 16 files changed, 1250 insertions(+), 91 deletions(-) --- base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b change-id: 20250129-arm-brbe-v19-24d5d9e5e623 Best regards,