From owner-svn-src-head@freebsd.org Mon Sep 24 17:41:30 2018 Return-Path: Delivered-To: svn-src-head@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 0CD4510B312E; Mon, 24 Sep 2018 17:41:30 +0000 (UTC) (envelope-from jhb@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 B73E68B7EA; Mon, 24 Sep 2018 17:41:29 +0000 (UTC) (envelope-from jhb@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 B20E11C96C; Mon, 24 Sep 2018 17:41:29 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w8OHfTV3025163; Mon, 24 Sep 2018 17:41:29 GMT (envelope-from jhb@FreeBSD.org) Received: (from jhb@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w8OHfTua025162; Mon, 24 Sep 2018 17:41:29 GMT (envelope-from jhb@FreeBSD.org) Message-Id: <201809241741.w8OHfTua025162@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jhb set sender to jhb@FreeBSD.org using -f From: John Baldwin Date: Mon, 24 Sep 2018 17:41:29 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r338914 - head/sys/riscv/riscv X-SVN-Group: head X-SVN-Commit-Author: jhb X-SVN-Commit-Paths: head/sys/riscv/riscv X-SVN-Commit-Revision: 338914 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 24 Sep 2018 17:41:30 -0000 Author: jhb Date: Mon Sep 24 17:41:29 2018 New Revision: 338914 URL: https://svnweb.freebsd.org/changeset/base/338914 Log: Implement pmap_sync_icache(). This invokes "fence" on the hart performing the write followed by an IPI to execute "fence.i" on all harts. This is required to support userland debuggers setting breakpoints in user processes. Reviewed by: br (earlier version), markj Approved by: re (gjb) Sponsored by: DARPA Differential Revision: https://reviews.freebsd.org/D17139 Modified: head/sys/riscv/riscv/pmap.c Modified: head/sys/riscv/riscv/pmap.c ============================================================================== --- head/sys/riscv/riscv/pmap.c Mon Sep 24 16:58:55 2018 (r338913) +++ head/sys/riscv/riscv/pmap.c Mon Sep 24 17:41:29 2018 (r338914) @@ -3244,11 +3244,27 @@ pmap_activate(struct thread *td) critical_exit(); } +static void +pmap_sync_icache_one(void *arg __unused) +{ + + __asm __volatile("fence.i"); +} + void pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz) { - panic("RISCVTODO: pmap_sync_icache"); + /* + * From the RISC-V User-Level ISA V2.2: + * + * "To make a store to instruction memory visible to all + * RISC-V harts, the writing hart has to execute a data FENCE + * before requesting that all remote RISC-V harts execute a + * FENCE.I." + */ + __asm __volatile("fence"); + smp_rendezvous(NULL, pmap_sync_icache_one, NULL, NULL); } /*