From owner-svn-src-head@freebsd.org Wed Jun 24 12:15:28 2020 Return-Path: Delivered-To: svn-src-head@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 A5ABE34CEFF; Wed, 24 Jun 2020 12:15:28 +0000 (UTC) (envelope-from mw@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 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 49sMYD3sW9z44HH; Wed, 24 Jun 2020 12:15:28 +0000 (UTC) (envelope-from mw@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 66017115D8; Wed, 24 Jun 2020 12:15:28 +0000 (UTC) (envelope-from mw@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 05OCFSuM083793; Wed, 24 Jun 2020 12:15:28 GMT (envelope-from mw@FreeBSD.org) Received: (from mw@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 05OCFSkZ083792; Wed, 24 Jun 2020 12:15:28 GMT (envelope-from mw@FreeBSD.org) Message-Id: <202006241215.05OCFSkZ083792@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mw set sender to mw@FreeBSD.org using -f From: Marcin Wojtas Date: Wed, 24 Jun 2020 12:15:28 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r362574 - head/sys/dev/uart X-SVN-Group: head X-SVN-Commit-Author: mw X-SVN-Commit-Paths: head/sys/dev/uart X-SVN-Commit-Revision: 362574 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: 2.1.33 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: Wed, 24 Jun 2020 12:15:28 -0000 Author: mw Date: Wed Jun 24 12:15:27 2020 New Revision: 362574 URL: https://svnweb.freebsd.org/changeset/base/362574 Log: Fix AccessWidth and BitWidth parsing in SPCR table The ACPI Specification defines a Generic Address Structure (GAS), which is used to describe UART controller register layout in the SPCR table. The driver responsible for parsing it (uart_cpu_acpi) wrongly associates the Access Size field to the uart_bas's regshft and the register BitWidth to the regiowidth - according to the definitions it should be opposite. This problem remained hidden most likely because the majority of platforms use 32-bit registers (BitWidth) which are accessed with the according size (Dword). However on Marvell Armada 8k / Cn913x platforms, the 32-bit registers should be accessed with Byte granulity, which unveiled the issue. This patch fixes above by proper values assignment and slightly improved parsing. Note that handling of the AccessWidth set to EFI_ACPI_6_0_UNDEFINED is needed to work around a buggy SPCR table on EC2 x86 "bare metal" instances. Reviewed by: manu, imp, cperciva, greg_unrelenting.technology Obtained from: Semihalf MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D25373 Modified: head/sys/dev/uart/uart_cpu_acpi.c Modified: head/sys/dev/uart/uart_cpu_acpi.c ============================================================================== --- head/sys/dev/uart/uart_cpu_acpi.c Wed Jun 24 07:25:54 2020 (r362573) +++ head/sys/dev/uart/uart_cpu_acpi.c Wed Jun 24 12:15:27 2020 (r362574) @@ -120,11 +120,46 @@ uart_cpu_acpi_spcr(int devtype, struct uart_devinfo *d (int)spcr->SerialPort.SpaceId); goto out; } - if (spcr->SerialPort.AccessWidth == 0) + switch (spcr->SerialPort.AccessWidth) { + case 0: /* EFI_ACPI_6_0_UNDEFINED */ + /* FALLTHROUGH */ + case 1: /* EFI_ACPI_6_0_BYTE */ + di->bas.regiowidth = 1; + break; + case 2: /* EFI_ACPI_6_0_WORD */ + di->bas.regiowidth = 2; + break; + case 3: /* EFI_ACPI_6_0_DWORD */ + di->bas.regiowidth = 4; + break; + case 4: /* EFI_ACPI_6_0_QWORD */ + di->bas.regiowidth = 8; + break; + default: + printf("UART unsupported access width: %d!\n", + (int)spcr->SerialPort.AccessWidth); + goto out; + } + switch (spcr->SerialPort.BitWidth) { + case 0: + /* FALLTHROUGH */ + case 8: di->bas.regshft = 0; - else - di->bas.regshft = spcr->SerialPort.AccessWidth - 1; - di->bas.regiowidth = spcr->SerialPort.BitWidth / 8; + break; + case 16: + di->bas.regshft = 1; + break; + case 32: + di->bas.regshft = 2; + break; + case 64: + di->bas.regshft = 3; + break; + default: + printf("UART unsupported bit width: %d!\n", + (int)spcr->SerialPort.BitWidth); + goto out; + } switch (spcr->BaudRate) { case 0: /* Special value; means "keep current value unchanged". */