From patchwork Tue May 17 10:07:41 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Clark X-Patchwork-Id: 12852242 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 D565EC433F5 for ; Tue, 17 May 2022 10:10:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To: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=Gdeq765lXtQFtP1EluaETO02MmDFWfPhlvzDpI5yEoE=; b=W5Rh7e2K0MzMfK ebVTYQkRk7KQoZ4EvwJUtpxDo/+us1R3elsddBpjN7QxnCj7Etxix2Gl6lAMia7HCCDd/Oe3L+jdG XPw/cpYM/nTuXESX6iZD9BF6cTBF0macUYzOPdbUVsVPXvuNoMBWWmpkUlog/3GAEbwIHOaoc+OxI uIjA/ZDGjqws4YCvAQzCBg3k/O9i3XiBMvclFDYwf5/BiYYaPIJvtmSSRZldWwGcpLnXJUo/nQfyE 4nygxrWaJ+P7Vaxkd9C1HuGHK1c99UQHWkXZrMJe1Mo31x/a3NAwbJzhyCHoOycNhFXsnnX0mPlwa 4XFiLpzXyXSpGzhE6FKQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nqu8a-00CwYj-S2; Tue, 17 May 2022 10:09:08 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nqu8X-00CwWq-AE for linux-arm-kernel@lists.infradead.org; Tue, 17 May 2022 10:09:06 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 209131042; Tue, 17 May 2022 03:09:01 -0700 (PDT) Received: from e121896.warwick.arm.com (e121896.warwick.arm.com [10.32.33.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id EB6603F66F; Tue, 17 May 2022 03:08:58 -0700 (PDT) From: James Clark To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, broonie@kernel.org, acme@kernel.org Cc: german.gomez@arm.com, leo.yan@linaro.org, mathieu.poirier@linaro.org, john.garry@huawei.com, James Clark , Catalin Marinas , Will Deacon , Jonathan Corbet , Mark Rutland , linux-doc@vger.kernel.org Subject: [PATCH v2 0/2] perf: arm64: Kernel support for Dwarf unwinding through SVE functions Date: Tue, 17 May 2022 11:07:41 +0100 Message-Id: <20220517100743.3020667-1-james.clark@arm.com> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220517_030905_436277_B56D37DA X-CRM114-Status: GOOD ( 10.18 ) 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 Changes since v1: * Add Mark's review tag * Clarify in docs that it's the SVE register length * Split patchset into kernel side and Perf tool changes When SVE registers are pushed onto the stack the VG register is required to unwind because the stack offsets would vary by the SVE register width at the time when the sample was taken. These first two patches add support for sampling the VG register to the kernel and the docs. There is another patchset to add support to userspace perf. A small change is also required to libunwind or libdw depending on which unwinder is used, and these will be published later. Without these changes Perf continues to work with both libraries, although the VG register is still not used for unwinding. Thanks James James Clark (2): perf: arm64: Add SVE vector granule register to user regs arm64/sve: Add Perf extensions documentation Documentation/arm64/sve.rst | 20 +++++++++++++++++ arch/arm64/include/uapi/asm/perf_regs.h | 7 +++++- arch/arm64/kernel/perf_regs.c | 30 +++++++++++++++++++++++-- drivers/perf/arm_pmu.c | 2 +- 4 files changed, 55 insertions(+), 4 deletions(-)