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GET /api/patches/2221805/?format=api
{ "id": 2221805, "url": "http://patchwork.ozlabs.org/api/patches/2221805/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120318.187521447@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/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/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260410120318.187521447@kernel.org>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260410120318.187521447@kernel.org/", "date": "2026-04-10T12:19:12", "name": "[09/38] iommu/vt-d: Use sched_clock() instead of get_cycles()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f59b608f4a2e6723b88c96c72e39b6b1a207985f", "submitter": { "id": 92397, "url": "http://patchwork.ozlabs.org/api/people/92397/?format=api", "name": "Thomas Gleixner", "email": "tglx@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260410120318.187521447@kernel.org/mbox/", "series": [ { "id": 499449, "url": "http://patchwork.ozlabs.org/api/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/2221805/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2221805/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19579-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=pacXAmHL;\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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Fri, 10 Apr 2026 22:19:36 +1000 (AEST)", "from boromir.ozlabs.org (localhost [127.0.0.1])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 4fsbT16HXVz305M;\n\tFri, 10 Apr 2026 22:19:17 +1000 (AEST)", "from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 4fsbT103lYz2yhD\n\tfor <linuxppc-dev@lists.ozlabs.org>; Fri, 10 Apr 2026 22:19:16 +1000 (AEST)", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n\tby sea.source.kernel.org (Postfix) with ESMTP id 65ACF44037;\n\tFri, 10 Apr 2026 12:19:15 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id 8BE3EC2BC87;\n\tFri, 10 Apr 2026 12:19:14 +0000 (UTC)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1775823557;\n\tcv=none;\n b=XuEAjrN5KqJSLvU2EwlWFx+UqubpKxa2x/ZIx60m8TRO3nvo22kanLldMf2UR+lIWfY5h8eto3HCMx13Fi5Uh7ZqqPtt3XQaaZ+q0sk5TU8v8K2RqHIr1My0qfoKPPDNQa8AHqB8FrdI4Oa1lmf26Ln30wEnKL2G9vWZEItPPyx+CNNEFZNtY5wInjBMG2kMqHRNAb2lReYudAcfap4u4FpeGX8U2QAPogbHhuG73b8uI1pz/PjdK5fTHAqeptsWvjR25LYUP+cA8SSasAASriXtj5strhJe5uAGHsTRP8R8ElDg8KfWApvM7/V+7pumF+BmOY4gx64qPdL2alKxCA==", "ARC-Message-Signature": "i=1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1775823555;\n\tbh=qtG4jYoFMBUH8Rv5LkkLsBrvbBwuDbTX1269QfkLCzw=;\n\th=Date:From:To:Cc:Subject:References:From;\n\tb=pacXAmHLAMseTev4RAQUAZDfRzJFeJXjwMW3x14w8vUm7ybikBbtslQQu96s/8Sq0\n\t a3pcIexn/gzfbwI2qYLuXSTx/gSXbmVwhuUFKfTY31pSFVH71nhoebkIPAnwJfmArK\n\t tPmJiCD8oWRaoY6EByg0L3DGpV75oKKW/C5lmUUCoaSznEsjUHpS9yyQByZ5hUlH3x\n\t P8NYw39byMTR2ebfPveTfvTFbDgwqYFvegEj7/kJQbjlvVeppRrN8YtOduabfxNT6E\n\t Yw4oV6JDjGSLEpWghPJGJFmnCci2PXJh9wjpVWvhGUbODkplfUDbeuEJIVIN1zibiF\n\t mC2OEaJT1jHhg==", "Date": "Fri, 10 Apr 2026 14:19:12 +0200", "Message-ID": "<20260410120318.187521447@kernel.org>", "User-Agent": "quilt/0.68", "From": "Thomas Gleixner <tglx@kernel.org>", "To": "LKML <linux-kernel@vger.kernel.org>", "Cc": "x86@kernel.org,\n Lu Baolu <baolu.lu@linux.intel.com>,\n iommu@lists.linux.dev,\n Arnd Bergmann <arnd@arndb.de>,\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 David Woodhouse <dwmw2@infradead.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 09/38] iommu/vt-d: Use sched_clock() instead of get_cycles()", "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": "Calculating the timeout from get_cycles() is a historical leftover without\nany functional requirement.\n\nUse ktime_get() instead.\n\nSigned-off-by: Thomas Gleixner <tglx@kernel.org>\nCc: x86@kernel.org\nCc: Lu Baolu <baolu.lu@linux.intel.com>\nCc: iommu@lists.linux.dev\n---\n arch/x86/include/asm/iommu.h | 3 ---\n drivers/iommu/intel/dmar.c | 4 ++--\n drivers/iommu/intel/iommu.h | 8 ++++++--\n 3 files changed, 8 insertions(+), 7 deletions(-)", "diff": "--- a/arch/x86/include/asm/iommu.h\n+++ b/arch/x86/include/asm/iommu.h\n@@ -18,9 +18,6 @@ extern bool x86_swiotlb_enable;\n #define x86_swiotlb_enable false\n #endif\n \n-/* 10 seconds */\n-#define DMAR_OPERATION_TIMEOUT ((cycles_t) tsc_khz*10*1000)\n-\n static inline int __init\n arch_rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)\n {\n--- a/drivers/iommu/intel/dmar.c\n+++ b/drivers/iommu/intel/dmar.c\n@@ -1606,9 +1606,9 @@ void qi_flush_pasid_cache(struct intel_i\n */\n void dmar_disable_qi(struct intel_iommu *iommu)\n {\n+\tktime_t start_time = ktime_get();\n \tunsigned long flags;\n \tu32 sts;\n-\tcycles_t start_time = get_cycles();\n \n \tif (!ecap_qis(iommu->ecap))\n \t\treturn;\n@@ -1624,7 +1624,7 @@ void dmar_disable_qi(struct intel_iommu\n \t */\n \twhile ((readl(iommu->reg + DMAR_IQT_REG) !=\n \t\treadl(iommu->reg + DMAR_IQH_REG)) &&\n-\t\t(DMAR_OPERATION_TIMEOUT > (get_cycles() - start_time)))\n+\t (DMAR_OPERATION_TIMEOUT > (ktime_get() - start_time)))\n \t\tcpu_relax();\n \n \tiommu->gcmd &= ~DMA_GCMD_QIE;\n--- a/drivers/iommu/intel/iommu.h\n+++ b/drivers/iommu/intel/iommu.h\n@@ -23,6 +23,7 @@\n #include <linux/xarray.h>\n #include <linux/perf_event.h>\n #include <linux/pci.h>\n+#include <linux/timekeeping.h>\n #include <linux/generic_pt/iommu.h>\n \n #include <asm/iommu.h>\n@@ -360,14 +361,17 @@\n /* PERFINTRSTS_REG */\n #define DMA_PERFINTRSTS_PIS\t((u32)1)\n \n+#define DMAR_OPERATION_TIMEOUT (((ktime_t)10) * NSEC_PER_SEC)\n+\n #define IOMMU_WAIT_OP(iommu, offset, op, cond, sts)\t\t\t\\\n do {\t\t\t\t\t\t\t\t\t\\\n-\tcycles_t start_time = get_cycles();\t\t\t\t\\\n+\tktime_t start_time = ktime_get();\t\t\t\t\\\n+\t\t\t\t\t\t\t\t\t\\\n \twhile (1) {\t\t\t\t\t\t\t\\\n \t\tsts = op(iommu->reg + offset);\t\t\t\t\\\n \t\tif (cond)\t\t\t\t\t\t\\\n \t\t\tbreak;\t\t\t\t\t\t\\\n-\t\tif (DMAR_OPERATION_TIMEOUT < (get_cycles() - start_time))\\\n+\t\tif (DMAR_OPERATION_TIMEOUT < (ktime_get() - start_time))\\\n \t\t\tpanic(\"DMAR hardware is malfunctioning\\n\");\t\\\n \t\tcpu_relax();\t\t\t\t\t\t\\\n \t}\t\t\t\t\t\t\t\t\\\n", "prefixes": [ "09/38" ] }