From patchwork Sat Oct 7 02:28:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sukadev Bhattiprolu X-Patchwork-Id: 822891 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [103.22.144.68]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3y89fn32HDz9t3t for ; Sat, 7 Oct 2017 13:38:25 +1100 (AEDT) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3y89fn27zTzDrVZ for ; Sat, 7 Oct 2017 13:38:25 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from ozlabs.org (bilbo.ozlabs.org [103.22.144.67]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3y89RY3yRkzDqnQ for ; Sat, 7 Oct 2017 13:28:41 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [103.22.144.67]) by bilbo.ozlabs.org (Postfix) with ESMTP id 3y89RX6yCJz8vjD for ; Sat, 7 Oct 2017 13:28:40 +1100 (AEDT) Received: by ozlabs.org (Postfix) id 3y89RX2gyCz9t7W; Sat, 7 Oct 2017 13:28:40 +1100 (AEDT) Delivered-To: linuxppc-dev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.vnet.ibm.com (client-ip=148.163.158.5; helo=mx0a-001b2d01.pphosted.com; envelope-from=sukadev@linux.vnet.ibm.com; receiver=) Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3y89RW4JpNz9t7F for ; Sat, 7 Oct 2017 13:28:39 +1100 (AEDT) Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id v972ObWV082919 for ; Fri, 6 Oct 2017 22:28:37 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0b-001b2d01.pphosted.com with ESMTP id 2denvf0k3u-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 06 Oct 2017 22:28:37 -0400 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 6 Oct 2017 20:28:36 -0600 Received: from b03cxnp08028.gho.boulder.ibm.com (9.17.130.20) by e33.co.us.ibm.com (192.168.1.133) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Fri, 6 Oct 2017 20:28:34 -0600 Received: from b03ledav004.gho.boulder.ibm.com (b03ledav004.gho.boulder.ibm.com [9.17.130.235]) by b03cxnp08028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v972SYT627656212; Fri, 6 Oct 2017 19:28:34 -0700 Received: from b03ledav004.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6361F7803F; Fri, 6 Oct 2017 20:28:34 -0600 (MDT) Received: from suka-w540.usor.ibm.com (unknown [9.70.94.25]) by b03ledav004.gho.boulder.ibm.com (Postfix) with ESMTP id C50B378037; Fri, 6 Oct 2017 20:28:33 -0600 (MDT) From: Sukadev Bhattiprolu To: Michael Ellerman Subject: [PATCH v2 06/18] powerpc/vas: Reduce polling interval for busy state Date: Fri, 6 Oct 2017 19:28:06 -0700 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1507343298-27496-1-git-send-email-sukadev@linux.vnet.ibm.com> References: <1507343298-27496-1-git-send-email-sukadev@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17100702-0008-0000-0000-000008AD17AC X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007853; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000235; SDB=6.00927531; UDB=6.00466725; IPR=6.00707787; BA=6.00005623; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00017430; XFM=3.00000015; UTC=2017-10-07 02:28:36 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17100702-0009-0000-0000-00004442D247 Message-Id: <1507343298-27496-7-git-send-email-sukadev@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-10-07_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1707230000 definitions=main-1710070033 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.24 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mikey@neuling.org, linux-kernel@vger.kernel.org, nicholas.piggin@gmail.com, linuxppc-dev@ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" A VAS window is normally in "busy" state for only a short duration. Reduce the time we wait for the window to go to "not-busy" state to speed-up vas_win_close() a bit. Signed-off-by: Sukadev Bhattiprolu --- arch/powerpc/platforms/powernv/vas-window.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/platforms/powernv/vas-window.c b/arch/powerpc/platforms/powernv/vas-window.c index 95622a9..1422cdd 100644 --- a/arch/powerpc/platforms/powernv/vas-window.c +++ b/arch/powerpc/platforms/powernv/vas-window.c @@ -1060,21 +1060,23 @@ int vas_paste_crb(struct vas_window *txwin, int offset, bool re) } EXPORT_SYMBOL_GPL(vas_paste_crb); +/* + * Wait for the window to go to "not-busy" state. It should only take a + * short time to queue a CRB, so window should not be busy for too long. + * Trying 5ms intervals. + */ static void poll_window_busy_state(struct vas_window *window) { int busy; u64 val; retry: - /* - * Poll Window Busy flag - */ val = read_hvwc_reg(window, VREG(WIN_STATUS)); busy = GET_FIELD(VAS_WIN_BUSY, val); if (busy) { val = 0; set_current_state(TASK_UNINTERRUPTIBLE); - schedule_timeout(HZ); + schedule_timeout(msecs_to_jiffies(5)); goto retry; } }