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GET /api/patches/814586/?format=api
{ "id": 814586, "url": "http://patchwork.ozlabs.org/api/patches/814586/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1505621128-23877-5-git-send-email-sukadev@linux.vnet.ibm.com/", "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": "<1505621128-23877-5-git-send-email-sukadev@linux.vnet.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/1505621128-23877-5-git-send-email-sukadev@linux.vnet.ibm.com/", "date": "2017-09-17T04:05:22", "name": "[04/10] powerpc/vas: Drop poll_window_cast_out().", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "5fc4a809d2beb464e95d8f51013356ffa2d1c3dc", "submitter": { "id": 984, "url": "http://patchwork.ozlabs.org/api/people/984/?format=api", "name": "Sukadev Bhattiprolu", "email": "sukadev@linux.vnet.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1505621128-23877-5-git-send-email-sukadev@linux.vnet.ibm.com/mbox/", "series": [ { "id": 3482, "url": "http://patchwork.ozlabs.org/api/series/3482/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=3482", "date": "2017-09-17T04:05:19", "name": "powerpc/vas: cleanup and optimizations", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/3482/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/814586/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/814586/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": [ "patchwork-incoming@ozlabs.org", "linuxppc-dev@lists.ozlabs.org", "linuxppc-dev@ozlabs.org" ], "Received": [ "from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xvwgW5mRjz9s7h\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSun, 17 Sep 2017 14:11:35 +1000 (AEST)", "from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])\n\tby lists.ozlabs.org (Postfix) with ESMTP id 3xvwgW4wv6zDsMK\n\tfor <patchwork-incoming@ozlabs.org>;\n\tSun, 17 Sep 2017 14:11:35 +1000 (AEST)", "from ozlabs.org (bilbo.ozlabs.org [103.22.144.67])\n\t(using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby lists.ozlabs.org (Postfix) with ESMTPS id 3xvwXp6FLTzDrnY\n\tfor <linuxppc-dev@lists.ozlabs.org>;\n\tSun, 17 Sep 2017 14:05:46 +1000 (AEST)", "from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2])\n\tby bilbo.ozlabs.org (Postfix) with ESMTP id 3xvwXp5dDWz8v8G\n\tfor <linuxppc-dev@lists.ozlabs.org>;\n\tSun, 17 Sep 2017 14:05:46 +1000 (AEST)", "by ozlabs.org (Postfix)\n\tid 3xvwXp5C6nz9t2M; Sun, 17 Sep 2017 14:05:46 +1000 (AEST)", "from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com\n\t[148.163.158.5])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xvwXp0vkGz9t2f\n\tfor <linuxppc-dev@ozlabs.org>; Sun, 17 Sep 2017 14:05:45 +1000 (AEST)", "from pps.filterd (m0098416.ppops.net [127.0.0.1])\n\tby mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id\n\tv8H44QaQ097604\n\tfor <linuxppc-dev@ozlabs.org>; Sun, 17 Sep 2017 00:05:44 -0400", "from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154])\n\tby mx0b-001b2d01.pphosted.com with ESMTP id 2d0wk9bae6-1\n\t(version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT)\n\tfor <linuxppc-dev@ozlabs.org>; Sun, 17 Sep 2017 00:05:43 -0400", "from localhost\n\tby e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use\n\tOnly! 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Violators will be prosecuted; \n\tSat, 16 Sep 2017 22:05:41 -0600", "from b03ledav005.gho.boulder.ibm.com\n\t(b03ledav005.gho.boulder.ibm.com [9.17.130.236])\n\tby b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with\n\tESMTP id v8H45e0Z59834476; Sat, 16 Sep 2017 21:05:40 -0700", "from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1])\n\tby IMSVA (Postfix) with ESMTP id A8E4BBE038;\n\tSat, 16 Sep 2017 22:05:40 -0600 (MDT)", "from suka-w540.usor.ibm.com (unknown [9.70.94.25])\n\tby b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTP id 4F14BBE03A;\n\tSat, 16 Sep 2017 22:05:40 -0600 (MDT)" ], "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com\n\t(client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com;\n\tenvelope-from=sukadev@linux.vnet.ibm.com; receiver=<UNKNOWN>)", "From": "Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>", "To": "Michael Ellerman <mpe@ellerman.id.au>", "Subject": "[PATCH 04/10] powerpc/vas: Drop poll_window_cast_out().", "Date": "Sat, 16 Sep 2017 21:05:22 -0700", "X-Mailer": "git-send-email 2.7.4", "In-Reply-To": "<1505621128-23877-1-git-send-email-sukadev@linux.vnet.ibm.com>", "References": "<1505621128-23877-1-git-send-email-sukadev@linux.vnet.ibm.com>", "X-TM-AS-GCONF": "00", "x-cbid": "17091704-0020-0000-0000-00000CB87755", "X-IBM-SpamModules-Scores": "", "X-IBM-SpamModules-Versions": "BY=3.00007754; HX=3.00000241; KW=3.00000007;\n\tPH=3.00000004; SC=3.00000229; SDB=6.00918138; UDB=6.00461173;\n\tIPR=6.00698363; \n\tBA=6.00005592; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009;\n\tZB=6.00000000; \n\tZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00017185;\n\tXFM=3.00000015; UTC=2017-09-17 04:05:42", "X-IBM-AV-DETECTION": "SAVI=unused REMOTE=unused XFE=unused", "x-cbparentid": "17091704-0021-0000-0000-00005E29124B", "Message-Id": "<1505621128-23877-5-git-send-email-sukadev@linux.vnet.ibm.com>", "X-Proofpoint-Virus-Version": "vendor=fsecure engine=2.50.10432:, ,\n\tdefinitions=2017-09-17_03:, , signatures=0", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n\tspamscore=0 suspectscore=0\n\tmalwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam\n\tadjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000\n\tdefinitions=main-1709170058", "X-BeenThere": "linuxppc-dev@lists.ozlabs.org", "X-Mailman-Version": "2.1.24", "Precedence": "list", "List-Id": "Linux on PowerPC Developers Mail List\n\t<linuxppc-dev.lists.ozlabs.org>", "List-Unsubscribe": "<https://lists.ozlabs.org/options/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>", "List-Archive": "<http://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>", "List-Subscribe": "<https://lists.ozlabs.org/listinfo/linuxppc-dev>,\n\t<mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>", "Cc": "linuxppc-dev@ozlabs.org, mikey@neuling.org, linux-kernel@vger.kernel.org", "Errors-To": "linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org", "Sender": "\"Linuxppc-dev\"\n\t<linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org>" }, "content": "Polling for window cast out is listed in the spec, but turns out that\nit is not strictly necessary and slows down window close. Making it a\nstub for now.\n\nSigned-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>\n---\n arch/powerpc/platforms/powernv/vas-window.c | 34 ++++++++++++++---------------\n 1 file changed, 17 insertions(+), 17 deletions(-)", "diff": "diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c\nindex 67ffc5d..8ab8a82 100644\n--- a/arch/powerpc/platforms/powernv/vas-window.c\n+++ b/arch/powerpc/platforms/powernv/vas-window.c\n@@ -1079,25 +1079,25 @@ static void poll_window_busy_state(struct vas_window *window)\n \t}\n }\n \n+/*\n+ * Have the hardware cast a window out of cache and wait for it to\n+ * be completed.\n+ *\n+ * NOTE: It can take a relatively long time to cast the window context\n+ *\tout of the cache. It is not strictly necessary to cast out if:\n+ *\n+ *\t- we clear the \"Pin Window\" bit (so hardware is free to evict)\n+ *\n+ *\t- we re-initialize the window context when it is reassigned.\n+ *\n+ *\tWe do the former in vas_win_close() and latter in vas_win_open().\n+ *\tSo, ignoring the cast-out for now. We can add it as needed. If\n+ *\tcasting out becomes necessary we should consider offloading the\n+ *\tjob to a worker thread, so the window close can proceed quickly.\n+ */\n static void poll_window_castout(struct vas_window *window)\n {\n-\tint cached;\n-\tu64 val;\n-\n-\t/* Cast window context out of the cache */\n-retry:\n-\tval = read_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL));\n-\tcached = GET_FIELD(VAS_WIN_CACHE_STATUS, val);\n-\tif (cached) {\n-\t\tval = 0ULL;\n-\t\tval = SET_FIELD(VAS_CASTOUT_REQ, val, 1);\n-\t\tval = SET_FIELD(VAS_PUSH_TO_MEM, val, 0);\n-\t\twrite_hvwc_reg(window, VREG(WIN_CTX_CACHING_CTL), val);\n-\n-\t\tset_current_state(TASK_UNINTERRUPTIBLE);\n-\t\tschedule_timeout(HZ);\n-\t\tgoto retry;\n-\t}\n+\t/* stub for now */\n }\n \n /*\n", "prefixes": [ "04/10" ] }