From patchwork Tue Mar 6 10:47:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 130770 Delivered-To: patch@linaro.org Received: by 10.46.66.2 with SMTP id p2csp3783672lja; Tue, 6 Mar 2018 02:49:49 -0800 (PST) X-Google-Smtp-Source: AG47ELtFPtoBBEch3rJfoEwCBYtTbUX9ODnz3ndg+YRukVOuLlM3NsLRFWPqu3JVYTb1Vv456Fy3 X-Received: by 10.99.39.131 with SMTP id n125mr14732665pgn.292.1520333388982; Tue, 06 Mar 2018 02:49:48 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1520333388; cv=none; d=google.com; s=arc-20160816; b=PDFcFHhR8zzZ5BGWS90Kz3X5JYJGWmEdFNLFtnMo5pb890mPfGvxpOOjSAfLzxDJE0 XL+kn0MhLAeDDVFcY3803UxRAXJA24peQCKo/Xp+BeIJofMr/RT05UmN3UyUpmUsODhG F7PM/60qHSdE2YCO81ZlITH9G1Dvl5br0f9Fey+8oz/NOiObE/h0tGYoqwfghilqRhRA iP0wW9Kt/pmN0qJ5LmV1ClCCvot7exIrQV+g3i6mUrZrPjp71qv6BBbwOR/X37h89Aek CHTh2S2cUahOGVkuIImOyleVDhictmG8M7qrgmPFZBZwGtECILFJgemHtxd+1ssv003j GO+A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:arc-authentication-results; bh=nvhWHZCipRIdJIkl7+hQmKOw1hwhNHiP712hSO7D/40=; b=k7baFC+gxqWHOB8Rc5//5Qj2zdtc3PiVjGNtJXaLIcBu3M93Ak3OhPBMz3fOEo3r7U CRcjhYWapvId6bwqj6DjucvwhnHwuzVjfds7LDiwe8cHyv3+0SeDUcD4GcspZ6VlM/wc vlRtz1EDgBZ4JRXcWhRqJB0+2PaQLB9vfrci5NMnDBkbwfVMbLGNWkwc+1EJykEFJQeZ ZDefkxPU0pCt/m7jt+75xi9V5VbvTfr4po7x0DwX/iLDEDEuj5TydpGkutEudCywT3LT EC5EFHEuQfH/NA0BOskH++7T+m4ZzUUO2ZdkDXVf18SzNFm5Nj++zCWowl6v98W8iCdk E8Tw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id m14si4284715pgs.206.2018.03.06.02.49.48; Tue, 06 Mar 2018 02:49:48 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753600AbeCFKt3 (ORCPT + 28 others); Tue, 6 Mar 2018 05:49:29 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:6155 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753423AbeCFKsb (ORCPT ); Tue, 6 Mar 2018 05:48:31 -0500 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 363A79576D828; Tue, 6 Mar 2018 18:48:14 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.361.1; Tue, 6 Mar 2018 18:48:08 +0800 From: John Garry To: , , , , , , , , , , , , , CC: , , , , , , , , , , , , , Subject: [PATCH v16 7/9] ACPI / scan: do not enumerate Indirect IO host children Date: Tue, 6 Mar 2018 18:47:46 +0800 Message-ID: <1520333268-82754-8-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1520333268-82754-1-git-send-email-john.garry@huawei.com> References: <1520333268-82754-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Through the logical PIO framework systems which otherwise have no IO space access to legacy ISA/LPC devices may access these devices through so-called "indirect IO" method. In this, IO space accesses for non-PCI hosts are redirected to a host LLDD to manually generate the IO space (bus) accesses. Hosts are able to register a region in logical PIO space to map to its bus address range. Indirect IO child devices have an associated host-specific bus address. Special translation is required to map between a logical PIO address for a device and it's host bus address. Since in the ACPI tables the child device IO resources would be the host-specific values, it is required the ACPI scan code should not enumerate these devices, and that this should be the responsibility of the host driver so that it can "fixup" the resources so that they map to the appropriate logical PIO addresses. To avoid enumerating these child devices, we check whether the parent for a device is a member of a known list of "indirect IO" hosts. For now, the HiSilicon LPC host controller ID is added. To flag a device to not be enumerated, we reuse the existing serial bus slave flag. Signed-off-by: John Garry Acked-by: Rafael J. Wysocki Reviewed-by: Andy Shevchenko Tested-by: dann frazier --- drivers/acpi/scan.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) -- 1.9.1 diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 8e63d93..c1a60852 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1524,11 +1524,25 @@ static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data) return -1; } +static bool acpi_is_indirect_io_slave(struct acpi_device *device) +{ + struct acpi_device *parent = device->parent; + const struct acpi_device_id indirect_io_hosts[] = { + {"HISI0191", 0}, + {} + }; + + return parent && !acpi_match_device_ids(parent, indirect_io_hosts); +} + static bool acpi_is_serial_bus_slave(struct acpi_device *device) { struct list_head resource_list; bool is_serial_bus_slave = false; + if (acpi_is_indirect_io_slave(device)) + return true; + /* Macs use device properties in lieu of _CRS resources */ if (x86_apple_machine && (fwnode_property_present(&device->fwnode, "spiSclkPeriod") ||