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GET /api/patches/816296/?format=api
{ "id": 816296, "url": "http://patchwork.ozlabs.org/api/patches/816296/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/a1088f188488122f9ec549e81cf3af707cb88840.1505244765.git.joseph.salisbury@canonical.com/", "project": { "id": 15, "url": "http://patchwork.ozlabs.org/api/projects/15/?format=api", "name": "Ubuntu Kernel", "link_name": "ubuntu-kernel", "list_id": "kernel-team.lists.ubuntu.com", "list_email": "kernel-team@lists.ubuntu.com", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<a1088f188488122f9ec549e81cf3af707cb88840.1505244765.git.joseph.salisbury@canonical.com>", "list_archive_url": null, "date": "2017-09-20T15:17:17", "name": "[SRU,Zesty,1/2] powerpc/perf: Avoid spurious PMU interrupts after idle", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "8a1d5907bdbad8ba234620cc75654daba1708493", "submitter": { "id": 7793, "url": "http://patchwork.ozlabs.org/api/people/7793/?format=api", "name": "Joseph Salisbury", "email": "joseph.salisbury@canonical.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/a1088f188488122f9ec549e81cf3af707cb88840.1505244765.git.joseph.salisbury@canonical.com/mbox/", "series": [ { "id": 4145, "url": "http://patchwork.ozlabs.org/api/series/4145/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=4145", "date": "2017-09-20T15:17:17", "name": "Fixes for LP:1716491", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/4145/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/816296/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/816296/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<kernel-team-bounces@lists.ubuntu.com>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.ubuntu.com\n\t(client-ip=91.189.94.19; helo=huckleberry.canonical.com;\n\tenvelope-from=kernel-team-bounces@lists.ubuntu.com;\n\treceiver=<UNKNOWN>)", "Received": [ "from huckleberry.canonical.com (huckleberry.canonical.com\n\t[91.189.94.19])\n\tby ozlabs.org (Postfix) with ESMTP id 3xy3JN6zVyz9t2W;\n\tThu, 21 Sep 2017 01:17:24 +1000 (AEST)", "from localhost ([127.0.0.1] helo=huckleberry.canonical.com)\n\tby huckleberry.canonical.com with esmtp (Exim 4.86_2)\n\t(envelope-from <kernel-team-bounces@lists.ubuntu.com>)\n\tid 1dugkb-0003fx-7C; Wed, 20 Sep 2017 15:17:21 +0000", "from youngberry.canonical.com ([91.189.89.112])\n\tby huckleberry.canonical.com with esmtps\n\t(TLS1.0:DHE_RSA_AES_128_CBC_SHA1:128)\n\t(Exim 4.86_2) (envelope-from <joseph.salisbury@canonical.com>)\n\tid 1dugkZ-0003ee-VK\n\tfor kernel-team@lists.ubuntu.com; Wed, 20 Sep 2017 15:17:19 +0000", "from 1.general.jsalisbury.us.vpn ([10.172.67.212] helo=salisbury)\n\tby youngberry.canonical.com with esmtpsa\n\t(TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.76) (envelope-from <joseph.salisbury@canonical.com>)\n\tid 1dugkZ-0002S8-KJ\n\tfor kernel-team@lists.ubuntu.com; Wed, 20 Sep 2017 15:17:19 +0000", "by salisbury (Postfix, from userid 1000)\n\tid 9B1AF7E2808; Wed, 20 Sep 2017 11:17:18 -0400 (EDT)" ], "From": "Joseph Salisbury <joseph.salisbury@canonical.com>", "To": "kernel-team@lists.ubuntu.com", "Subject": "[SRU][Zesty][PATCH 1/2] powerpc/perf: Avoid spurious PMU interrupts\n\tafter idle", "Date": "Wed, 20 Sep 2017 11:17:17 -0400", "Message-Id": "<a1088f188488122f9ec549e81cf3af707cb88840.1505244765.git.joseph.salisbury@canonical.com>", "X-Mailer": "git-send-email 2.7.4", "In-Reply-To": [ "<cover.1505244765.git.joseph.salisbury@canonical.com>", "<cover.1505244765.git.joseph.salisbury@canonical.com>" ], "References": [ "<cover.1505244765.git.joseph.salisbury@canonical.com>", "<cover.1505244765.git.joseph.salisbury@canonical.com>" ], "X-BeenThere": "kernel-team@lists.ubuntu.com", "X-Mailman-Version": "2.1.20", "Precedence": "list", "List-Id": "Kernel team discussions <kernel-team.lists.ubuntu.com>", "List-Unsubscribe": "<https://lists.ubuntu.com/mailman/options/kernel-team>,\n\t<mailto:kernel-team-request@lists.ubuntu.com?subject=unsubscribe>", "List-Archive": "<https://lists.ubuntu.com/archives/kernel-team>", "List-Post": "<mailto:kernel-team@lists.ubuntu.com>", "List-Help": "<mailto:kernel-team-request@lists.ubuntu.com?subject=help>", "List-Subscribe": "<https://lists.ubuntu.com/mailman/listinfo/kernel-team>,\n\t<mailto:kernel-team-request@lists.ubuntu.com?subject=subscribe>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "kernel-team-bounces@lists.ubuntu.com", "Sender": "\"kernel-team\" <kernel-team-bounces@lists.ubuntu.com>" }, "content": "From: Nicholas Piggin <npiggin@gmail.com>\n\nBugLink: http://bugs.launchpad.net/bugs/1716491\n\nPOWER9 DD2 can see spurious PMU interrupts after state-loss idle in\nsome conditions.\n\nA solution is to save and reload MMCR0 over state-loss idle.\n\nSigned-off-by: Nicholas Piggin <npiggin@gmail.com>\nAcked-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>\nTested-by: Anton Blanchard <anton@samba.org>\nSigned-off-by: Michael Ellerman <mpe@ellerman.id.au>\n(cherry picked from commit 101dd590a7fa37954540cf3149a1c502c0acc524)\nSigned-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>\n---\n arch/powerpc/kernel/idle_book3s.S | 15 ++++++++++++++-\n 1 file changed, 14 insertions(+), 1 deletion(-)", "diff": "diff --git a/arch/powerpc/kernel/idle_book3s.S b/arch/powerpc/kernel/idle_book3s.S\nindex fb762ee..e003fb9 100644\n--- a/arch/powerpc/kernel/idle_book3s.S\n+++ b/arch/powerpc/kernel/idle_book3s.S\n@@ -29,6 +29,7 @@\n * Use unused space in the interrupt stack to save and restore\n * registers for winkle support.\n */\n+#define _MMCR0\tGPR0\n #define _SDR1\tGPR3\n #define _RPR\tGPR4\n #define _SPURR\tGPR5\n@@ -282,6 +283,14 @@ power_enter_stop:\n \tb \tpnv_wakeup_noloss\n \n .Lhandle_esl_ec_set:\n+\t/*\n+\t * POWER9 DD2 can incorrectly set PMAO when waking up after a\n+\t * state-loss idle. Saving and restoring MMCR0 over idle is a\n+\t * workaround.\n+\t */\n+\tmfspr\tr4,SPRN_MMCR0\n+\tstd\tr4,_MMCR0(r1)\n+\n /*\n * Check if the requested state is a deep idle state.\n */\n@@ -434,10 +443,14 @@ FTR_SECTION_ELSE_NESTED(70)\n ALT_FTR_SECTION_END_NESTED_IFSET(CPU_FTR_POWER9_DD1, 70)\n \t/*\n \t * Workaround for POWER9, if we lost resources, the ERAT\n-\t * might have been mixed up and needs flushing.\n+\t * might have been mixed up and needs flushing. We also need\n+\t * to reload MMCR0 (see comment above).\n \t */\n \tblt\tcr3,1f\n \tPPC_INVALIDATE_ERAT\n+\tld\tr1,PACAR1(r13)\n+\tld\tr4,_MMCR0(r1)\n+\tmtspr\tSPRN_MMCR0,r4\n 1:\n \t/*\n \t * POWER ISA 3. Use PSSCR to determine if we\n", "prefixes": [ "SRU", "Zesty", "1/2" ] }