From owner-svn-src-all@freebsd.org Tue Feb 20 07:30:57 2018 Return-Path: Delivered-To: svn-src-all@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id D5D32F0B180; Tue, 20 Feb 2018 07:30:57 +0000 (UTC) (envelope-from wma@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8713087BFD; Tue, 20 Feb 2018 07:30:57 +0000 (UTC) (envelope-from wma@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 820F72656D; Tue, 20 Feb 2018 07:30:57 +0000 (UTC) (envelope-from wma@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w1K7UvJO056664; Tue, 20 Feb 2018 07:30:57 GMT (envelope-from wma@FreeBSD.org) Received: (from wma@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w1K7Uv7R056663; Tue, 20 Feb 2018 07:30:57 GMT (envelope-from wma@FreeBSD.org) Message-Id: <201802200730.w1K7Uv7R056663@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: wma set sender to wma@FreeBSD.org using -f From: Wojciech Macek Date: Tue, 20 Feb 2018 07:30:57 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r329635 - head/sys/powerpc/powerpc X-SVN-Group: head X-SVN-Commit-Author: wma X-SVN-Commit-Paths: head/sys/powerpc/powerpc X-SVN-Commit-Revision: 329635 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Feb 2018 07:30:58 -0000 Author: wma Date: Tue Feb 20 07:30:57 2018 New Revision: 329635 URL: https://svnweb.freebsd.org/changeset/base/329635 Log: PowerPC: Switch to more accurate unit to avoid division rounding On POWER8 architecture there is a timer with 512Mhz frequency. It has about 1,95ns period, but it is rounded to 1ns which is not accurate. Submitted by: Patryk Duda Obtained from: Semihalf Reviewed by: wma Sponsored by: IBM, QCM Technologies Differential revision: https://reviews.freebsd.org/D14433 Modified: head/sys/powerpc/powerpc/clock.c Modified: head/sys/powerpc/powerpc/clock.c ============================================================================== --- head/sys/powerpc/powerpc/clock.c Tue Feb 20 06:38:55 2018 (r329634) +++ head/sys/powerpc/powerpc/clock.c Tue Feb 20 07:30:57 2018 (r329635) @@ -82,7 +82,7 @@ __FBSDID("$FreeBSD$"); * Initially we assume a processor with a bus frequency of 12.5 MHz. */ static int initialized = 0; -static u_long ns_per_tick = 80; +static uint64_t ps_per_tick = 80000; static u_long ticks_per_sec = 12500000; static u_long *decr_counts[MAXCPU]; @@ -178,7 +178,7 @@ decr_init(void) if (platform_smp_get_bsp(&cpu) != 0) platform_smp_first_cpu(&cpu); ticks_per_sec = platform_timebase_freq(&cpu); - ns_per_tick = 1000000000 / ticks_per_sec; + ps_per_tick = 1000000000000 / ticks_per_sec; set_cputicker(mftb, ticks_per_sec, 0); snprintf(buf, sizeof(buf), "cpu%d:decrementer", curcpu); @@ -307,7 +307,7 @@ DELAY(int n) TSENTER(); tb = mftb(); - ttb = tb + howmany(n * 1000, ns_per_tick); + ttb = tb + howmany((uint64_t)n * 1000000, ps_per_tick); while (tb < ttb) tb = mftb(); TSEXIT();