From owner-freebsd-bugs@freebsd.org Sat Dec 21 08:12:51 2019 Return-Path: Delivered-To: freebsd-bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 47C621CC1FC for ; Sat, 21 Dec 2019 08:12:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.nyi.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id 47fyz71Dm7z41sZ for ; Sat, 21 Dec 2019 08:12:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.nyi.freebsd.org (Postfix) id 2A4211CC1FB; Sat, 21 Dec 2019 08:12:51 +0000 (UTC) Delivered-To: bugs@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 28F171CC1FA for ; Sat, 21 Dec 2019 08:12:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 47fyz70Bblz41sX for ; Sat, 21 Dec 2019 08:12:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2610:1c1:1:606c::50:1d]) (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 02208C87C for ; Sat, 21 Dec 2019 08:12:51 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.5]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id xBL8CoFM031871 for ; Sat, 21 Dec 2019 08:12:50 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id xBL8CoIK031870 for bugs@FreeBSD.org; Sat, 21 Dec 2019 08:12:50 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 204521] [new driver] [request] Port rtsx from OpenBSD to FreeBSD Date: Sat, 21 Dec 2019 08:12:49 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: CURRENT X-Bugzilla-Keywords: feature, patch X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: gljennjohn@gmail.com X-Bugzilla-Status: In Progress X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 21 Dec 2019 08:12:51 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D204521 --- Comment #33 from Gary Jennejohn --- I tried implementing rtsx_xfer_bounce() from the OpenBSD code. OpenBSD uses this function when the upstream code does not pass in a list of DMA scatter-gather addresses. Normally, the SD code in OpenBSD allocates i= ts own DMA buffers and passes them to the driver. Since FreeBSD does not do that - it either uses buffers on the kernel stack= or buffers from a struct bio - it seemed logical to me to try rtsx_xfer_bouce(= ). The DMA transfer raises an interrupt, but the target buffer is always filled with 0s. I'm running out of ideas on how to get DMA to work. If I had a laptop I could tear apart I'd put a logic analyzer on the contro= ller pins and compare the behavior between OpenBSD and FreeBSD. Unfortunately, = the laptop I have is a loaner and I can't do that. --=20 You are receiving this mail because: You are the assignee for the bug.=