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GET /api/1.1/patches/2221811/?format=api
{ "id": 2221811, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2221811/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120318.592237447@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/" }, "msgid": "<20260410120318.592237447@kernel.org>", "date": "2026-04-10T12:19:42", "name": "[15/38] ptp: ptp_vmclock: Replace get_cycles() usage", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "0b0463d40f1539e1ad68c6da8ee1663879ac28ab", "submitter": { "id": 92397, "url": "http://patchwork.ozlabs.org/api/1.1/people/92397/?format=api", "name": "Thomas Gleixner", "email": "tglx@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120318.592237447@kernel.org/mbox/", "series": [ { "id": 499449, "url": "http://patchwork.ozlabs.org/api/1.1/series/499449/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499449", "date": "2026-04-10T12:18:27", "name": "treewide: Cleanup LATCH, CLOCK_TICK_RATE and get_cycles() [ab]use", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499449/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2221811/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221811/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19585-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=lx7PSe/P;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775823585;\n\tbh=QeSclCuMiRAS5wk6lWoviUdmtawCgYPJK7955XSCrpk=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=lx7PSe/PjadVTpIMwJdhAJBLt/wkFkRfbRhizAqdCmT18BPcbSlnMFeRTECetW5Mz\n\t e18kIbNIOdNmzSRNcljN5MiUEDzdauvDtZpRrKPYAQq6HuU0ixY90WW/AT9/9BP1TE\n\t G0pmyVH8DHnvheD/Jtznb1TEyB0LG5ezsRLYR23JSrj8T1XCNh6BmAZvkaj4VTBCOk\n\t FjtLvndHPm1jEFcE8PqfK7D9YifyYmXQkYky/wPITICuSdRrICGnLkZ3jZxe25sBaP\n\t q8ggvP1HMAsaRRMlhxP+iwStOOzZHUsvv+/U0DMMTE0lc38vp99aMg2cqhdxuGrXAu\n\t mqm2UYpSfgZaw==", "Date": "Fri, 10 Apr 2026 14:19:42 +0200", "Message-ID": "<20260410120318.592237447@kernel.org>", "User-Agent": "quilt/0.68", "From": "Thomas Gleixner <tglx@kernel.org>", "To": "LKML <linux-kernel@vger.kernel.org>", "Cc": "David Woodhouse <dwmw2@infradead.org>,\n Arnd Bergmann <arnd@arndb.de>,\n x86@kernel.org,\n Lu Baolu <baolu.lu@linux.intel.com>,\n iommu@lists.linux.dev,\n Michael Grzeschik <m.grzeschik@pengutronix.de>,\n netdev@vger.kernel.org,\n linux-wireless@vger.kernel.org,\n Herbert Xu <herbert@gondor.apana.org.au>,\n linux-crypto@vger.kernel.org,\n Vlastimil Babka <vbabka@kernel.org>,\n linux-mm@kvack.org,\n Bernie Thompson <bernie@plugable.com>,\n linux-fbdev@vger.kernel.org,\n \"Theodore Tso\" <tytso@mit.edu>,\n linux-ext4@vger.kernel.org,\n Andrew Morton <akpm@linux-foundation.org>,\n Uladzislau Rezki <urezki@gmail.com>,\n Marco Elver <elver@google.com>,\n Dmitry Vyukov <dvyukov@google.com>,\n kasan-dev@googlegroups.com,\n Andrey Ryabinin <ryabinin.a.a@gmail.com>,\n Thomas Sailer <t.sailer@alumni.ethz.ch>,\n linux-hams@vger.kernel.org,\n \"Jason A. Donenfeld\" <Jason@zx2c4.com>,\n Richard Henderson <richard.henderson@linaro.org>,\n linux-alpha@vger.kernel.org,\n Russell King <linux@armlinux.org.uk>,\n linux-arm-kernel@lists.infradead.org,\n Catalin Marinas <catalin.marinas@arm.com>,\n Huacai Chen <chenhuacai@kernel.org>,\n loongarch@lists.linux.dev,\n Geert Uytterhoeven <geert@linux-m68k.org>,\n linux-m68k@lists.linux-m68k.org,\n Dinh Nguyen <dinguyen@kernel.org>,\n Jonas Bonn <jonas@southpole.se>,\n linux-openrisc@vger.kernel.org,\n Helge Deller <deller@gmx.de>,\n linux-parisc@vger.kernel.org,\n Michael Ellerman <mpe@ellerman.id.au>,\n linuxppc-dev@lists.ozlabs.org,\n Paul Walmsley <pjw@kernel.org>,\n linux-riscv@lists.infradead.org,\n Heiko Carstens <hca@linux.ibm.com>,\n linux-s390@vger.kernel.org,\n \"David S. Miller\" <davem@davemloft.net>,\n sparclinux@vger.kernel.org", "Subject": "[patch 15/38] ptp: ptp_vmclock: Replace get_cycles() usage", "References": "<20260410120044.031381086@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "X-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "get_cycles() is not really well defined and similar to other usaage of the\nunderlying hardware CPU counters the PTP vmclock should use an explicit\ninterface as well.\n\nImplement ptp_vmclock_read_cpu_counter() in arm64 and x86 and simplify the\nKconfig selection while at it.\n\nNo functional change.\n\nSigned-off-by: Thomas Gleixner <tglx@kernel.org>\nCc: David Woodhouse <dwmw2@infradead.org>\n---\n arch/arm64/Kconfig | 1 +\n arch/arm64/include/asm/ptp_vmclock.h | 12 ++++++++++++\n arch/x86/Kconfig | 1 +\n arch/x86/include/asm/ptp_vmclock.h | 12 ++++++++++++\n drivers/ptp/Kconfig | 6 ++++--\n drivers/ptp/ptp_vmclock.c | 6 ++++--\n 6 files changed, 34 insertions(+), 4 deletions(-)", "diff": "--- a/arch/arm64/Kconfig\n+++ b/arch/arm64/Kconfig\n@@ -112,6 +112,7 @@ config ARM64\n \tselect ARCH_SUPPORTS_SCHED_SMT\n \tselect ARCH_SUPPORTS_SCHED_CLUSTER\n \tselect ARCH_SUPPORTS_SCHED_MC\n+\tselect ARCH_SUPPORTS_PTP_VMCLOCK if ARCH_SUPPORTS_INT128\n \tselect ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH\n \tselect ARCH_WANT_COMPAT_IPC_PARSE_VERSION if COMPAT\n \tselect ARCH_WANT_DEFAULT_BPF_JIT\n--- /dev/null\n+++ b/arch/arm64/include/asm/ptp_vmclock.h\n@@ -0,0 +1,12 @@\n+/* SPDX-License-Identifier: GPL-2.0-only */\n+#ifndef __ASM_PTP_VMCLOCK_H\n+#define __ASM_PTP_VMCLOCK_H\n+\n+#include <asm/arch_timer.h>\n+\n+static inline u64 ptp_vmclock_read_cpu_counter(void)\n+{\n+\treturn arch_timer_read_counter();\n+}\n+\n+#endif\n--- a/arch/x86/Kconfig\n+++ b/arch/x86/Kconfig\n@@ -135,6 +135,7 @@ config X86\n \tselect ARCH_SUPPORTS_RT\n \tselect ARCH_SUPPORTS_AUTOFDO_CLANG\n \tselect ARCH_SUPPORTS_PROPELLER_CLANG if X86_64\n+\tselect ARCH_SUPPORTS_PTP_VMCLOCK\tif X86_TSC\n \tselect ARCH_USE_BUILTIN_BSWAP\n \tselect ARCH_USE_CMPXCHG_LOCKREF\t\tif X86_CX8\n \tselect ARCH_USE_MEMTEST\n--- /dev/null\n+++ b/arch/x86/include/asm/ptp_vmclock.h\n@@ -0,0 +1,12 @@\n+/* SPDX-License-Identifier: GPL-2.0-only */\n+#ifndef __ASM_PTP_VMCLOCK_H\n+#define __ASM_PTP_VMCLOCK_H\n+\n+#include <asm/tsc.h>\n+\n+static inline u64 ptp_vmclock_read_cpu_counter(void)\n+{\n+\treturn cpu_feature_enabled(X86_FEATURE_TSC) ? rdtsc() : 0;\n+}\n+\n+#endif\n--- a/drivers/ptp/Kconfig\n+++ b/drivers/ptp/Kconfig\n@@ -131,10 +131,12 @@ config PTP_1588_CLOCK_KVM\n \t To compile this driver as a module, choose M here: the module\n \t will be called ptp_kvm.\n \n+config ARCH_SUPPORTS_PTP_VMCLOCK\n+\tbool\n+\n config PTP_1588_CLOCK_VMCLOCK\n \ttristate \"Virtual machine PTP clock\"\n-\tdepends on X86_TSC || ARM_ARCH_TIMER\n-\tdepends on PTP_1588_CLOCK && ARCH_SUPPORTS_INT128\n+\tdepends on PTP_1588_CLOCK && ARCH_SUPPORTS_PTP_VMCLOCK\n \tdefault PTP_1588_CLOCK_KVM\n \thelp\n \t This driver adds support for using a virtual precision clock\n--- a/drivers/ptp/ptp_vmclock.c\n+++ b/drivers/ptp/ptp_vmclock.c\n@@ -28,6 +28,8 @@\n \n #include <linux/ptp_clock_kernel.h>\n \n+#include <asm/ptp_vmclock.h>\n+\n #ifdef CONFIG_X86\n #include <asm/pvclock.h>\n #include <asm/kvmclock.h>\n@@ -144,11 +146,11 @@ static int vmclock_get_crosststamp(struc\n \t\t\tif (systime_snapshot.cs_id == st->cs_id) {\n \t\t\t\tcycle = systime_snapshot.cycles;\n \t\t\t} else {\n-\t\t\t\tcycle = get_cycles();\n+\t\t\t\tcycle = ptp_vmclock_read_cpu_counter();\n \t\t\t\tptp_read_system_postts(sts);\n \t\t\t}\n \t\t} else {\n-\t\t\tcycle = get_cycles();\n+\t\t\tcycle = ptp_vmclock_read_cpu_counter();\n \t\t}\n \n \t\tdelta = cycle - le64_to_cpu(st->clk->counter_value);\n", "prefixes": [ "15/38" ] }