From patchwork Wed Dec 4 21:22:03 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: al.stone@linaro.org X-Patchwork-Id: 3285411 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 3A38C9F37A for ; Wed, 4 Dec 2013 21:25:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 45A3920200 for ; Wed, 4 Dec 2013 21:25:57 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EA0D4201FA for ; Wed, 4 Dec 2013 21:25:55 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VoJvH-0008A9-GG; Wed, 04 Dec 2013 21:23:56 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VoJun-0001VL-8J; Wed, 04 Dec 2013 21:23:25 +0000 Received: from mail-ie0-f175.google.com ([209.85.223.175]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VoJuE-0001QC-Eu for linux-arm-kernel@lists.infradead.org; Wed, 04 Dec 2013 21:22:51 +0000 Received: by mail-ie0-f175.google.com with SMTP id x13so28163864ief.34 for ; Wed, 04 Dec 2013 13:22:29 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=95en/K5A7+fd2KwEPUuwM/XS9+HBCKjEhyHBsreAqYg=; b=B01ks1SFVpVDrjCrvCrCU8q1toUZPCTKHFwwYxixycVOSJiQbnnoXUj++h3PanPnRt ZzfaIMYf3uICSz83UWvzLXzhHkcTJfpUMA6Ga84rwRGAIT+CkhD3EJ4fbynKgy3k6QnT sCVxaqH7y5ZSJZycJav/ewldXd8oTcKk5wrX0UoBQQ49A7C6524bAXNA+pS2lDx27c9W m3Vus52nkKSj3Fy6BfHNEl5ofrvWFnIqtX6gNCtFC6klhn8LHUB+hJxGCLN/Bf54xklH p7paIOowmVS3CTa6fVTDzuwfMLpXZW0V9sGnJ7FyKNRIL55b+nj4RnUblZmkdJ6cueaW tSgQ== X-Gm-Message-State: ALoCoQkO4es/9tHZJOioVmr7tMkt0aFuI4L4GnJbfRY25DOudLIETdjevWW9/PDanLJu5TV2B5W7 X-Received: by 10.42.44.9 with SMTP id z9mr1534873ice.88.1386192138788; Wed, 04 Dec 2013 13:22:18 -0800 (PST) Received: from fidelio.ahs3 (74-93-232-46-Colorado.hfc.comcastbusiness.net. [74.93.232.46]) by mx.google.com with ESMTPSA id f5sm6351925igc.4.2013.12.04.13.22.17 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Dec 2013 13:22:18 -0800 (PST) From: al.stone@linaro.org To: linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 1/5] ACPI: introduce CONFIG_ACPI_REDUCED_HARDWARE to enable this ACPI mode Date: Wed, 4 Dec 2013 14:22:03 -0700 Message-Id: <1386192127-28564-2-git-send-email-al.stone@linaro.org> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1386192127-28564-1-git-send-email-al.stone@linaro.org> References: <1386192127-28564-1-git-send-email-al.stone@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131204_162250_610312_EB85719D X-CRM114-Status: GOOD ( 14.47 ) X-Spam-Score: -0.1 (/) Cc: Hanjun Guo , patches@linaro.org, Al Stone , linaro-kernel@lists.linaro.org, linaro-acpi@lists.linaro.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-1.7 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, SUSPICIOUS_RECIPS, UNPARSEABLE_RELAY autolearn=no version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Al Stone To enable the hardware reduced mode of ACPI on some platforms (such as ARM), we need to modify the kernel code and set ACPI_REDUCED_HARDWARE to TRUE in the ACPICA source. This can be done more resonably by introducing a kernel config item to enable/disable ACPI_REDUCED_HARDWARE. We can then change the kernel config instead of having to modify the kernel source directly to enable the reduced hardware mode of ACPI. Lv Zheng suggested that this configuration item does not belong in ACPICA, the upstream source for much of the ACPI internals, but rather to the Linux kernel itself. Hence, we introduce this flag so that we can make ACPI_REDUCED_HARDWARE configurable. For the details of the discussion, please refer to: http://www.spinics.net/lists/linux-acpi/msg46369.html Support for X86 in hardware reduced mode is also provided to make it simpler to debug this mode, and to provide for probable use in such products. Hardware reduced mode, despite the name, exists primarily to allow newer platforms to use a much simpler form of ACPI that does not require supporting the legacy of previous versions of the specification, and is likely to be used more often in the near future as a result. Signed-off-by: Hanjun Guo Signed-off-by: Al Stone --- drivers/acpi/Kconfig | 8 ++++++++ include/acpi/platform/aclinux.h | 6 ++++++ 2 files changed, 14 insertions(+) diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 5d92485..66e6bb2 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -343,6 +343,14 @@ config ACPI_BGRT data from the firmware boot splash. It will appear under /sys/firmware/acpi/bgrt/ . +config ACPI_REDUCED_HARDWARE + bool "Hardware-reduced ACPI support" + depends on X86 || ARM || ARM64 + help + This config adds support for Hardware-reduced ACPI. When this option + is selected, will generate a specialized version of ACPICA that ONLY + supports the ACPI "reduced hardware". + source "drivers/acpi/apei/Kconfig" config ACPI_EXTLOG diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h index 28f4f4d..a33f502 100644 --- a/include/acpi/platform/aclinux.h +++ b/include/acpi/platform/aclinux.h @@ -52,6 +52,12 @@ #ifdef __KERNEL__ +/* Compile for reduced hardware mode if requested for this kernel config */ + +#ifdef CONFIG_ACPI_REDUCED_HARDWARE +#define ACPI_REDUCED_HARDWARE 1 +#endif + #include #include #include