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From: jcm@redhat.com (Jon Masters)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 02/17] ARM64 / ACPI: Get RSDP and ACPI boot-time tables
Date: Tue, 9 Sep 2014 12:44:45 -0400 (EDT)	[thread overview]
Message-ID: <1672724278.9306589.1410281085602.JavaMail.zimbra@zmail15.collab.prod.int.phx2.redhat.com> (raw)
In-Reply-To: <540F2DCF.1010104@redhat.com>

One of the ARM guys pointed out the cache issue before I had meant to send this note then. Sorry.

-- 
Computer Architect | Sent from my #ARM Powered Mobile device

On Sep 9, 2014 12:41 PM, Jon Masters <jcm@redhat.com> wrote:
>
> On 09/09/2014 12:26 PM, Catalin Marinas wrote: 
> > On Mon, Sep 01, 2014 at 03:On 09/09/2014 12:26 PM, Catalin Marinas wrote:
> On Mon, Sep 01, 2014 at 03:57:40PM +0100, Hanjun Guo wrote:
>> diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h
>> new file mode 100644
>> index 0000000..3899ee6
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/acenv.h
>> @@ -0,0 +1,18 @@
>> +/*
>> + * ARM64 specific ACPICA environments and implementation
>> + *
>> + * Copyright (C) 2014, Linaro Ltd.
>> + *   Author: Hanjun Guo <hanjun.guo@linaro.org>
>> + *   Author: Graeme Gregory <graeme.gregory@linaro.org>
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + */
>> +
>> +#ifndef _ASM_ACENV_H
>> +#define _ASM_ACENV_H
>> +
>> +#define ACPI_FLUSH_CPU_CACHE() WARN_ONCE(1, "Not currently supported on ARM64")
> 
> Does this mean that it will be supported at some point? Looking at the
> places where this function is called, I don't really see how this would
> ever work on ARM. Which means that we add such macro just to be able to
> compile code that would never be used on arm64. I would rather see the
> relevant ACPI files only compiled on x86/IA-64 rather than arm64.

That specific cache behavior is a part of e.g. ACPI C3 state support
(e.g. ACPI5.1 8.1.4 Processor Power State C3). As you note, it's not
going to work on 64-bit ARM as it does on x86, but it's optional to
implement C3 and early 64-bit ARM systems should not report Wbindv flags
in the FADT anyway. They can also set FADT.P_LVL3_LAT > 1000, which has
the effect of disabling C3 support, while also allowing for use of _CST
objects to define more flexible C-States later on.

Jon.

  reply	other threads:[~2014-09-09 16:44 UTC|newest]

Thread overview: 117+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-01 14:57 [PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1 Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 01/17] ARM64: Move the init of cpu_logical_map(0) before unflatten_device_tree() Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 02/17] ARM64 / ACPI: Get RSDP and ACPI boot-time tables Hanjun Guo
2014-09-09 16:26   ` Catalin Marinas
2014-09-09 16:41     ` Jon Masters
2014-09-09 16:44       ` Jon Masters [this message]
2014-09-09 17:15       ` Mark Rutland
2014-09-09 17:33         ` Jon Masters
2014-09-09 17:50         ` Lorenzo Pieralisi
2014-09-09 18:05           ` Sudeep Holla
2014-09-09 19:06             ` Jon Masters
2014-09-10 11:13               ` Hanjun Guo
2014-09-10 12:33                 ` Catalin Marinas
2014-09-10 21:51                   ` Grant Likely
2014-09-11 11:01                     ` Catalin Marinas
2014-09-14 15:40                       ` Grant Likely
2014-09-14 21:59                         ` Catalin Marinas
2014-09-15  3:53                           ` Grant Likely
2014-09-16  5:29                     ` Zheng, Lv
2014-09-10 21:41                 ` Grant Likely
2014-09-09 16:54     ` Mark Rutland
2014-09-10  7:30     ` Hanjun Guo
2014-09-10 21:37     ` Grant Likely
2014-09-01 14:57 ` [PATCH v3 03/17] ARM64 / ACPI: Introduce lowlevel suspend function Hanjun Guo
2014-09-09 16:35   ` Catalin Marinas
2014-09-09 22:04     ` Graeme Gregory
2014-09-01 14:57 ` [PATCH v3 04/17] ARM64 / ACPI: Introduce early_param for "acpi" Hanjun Guo
2014-09-09 16:37   ` Catalin Marinas
2014-09-09 17:17   ` Bjorn Helgaas
2014-09-09 22:14     ` Jon Masters
2014-09-10 13:04       ` Will Deacon
2014-09-10 13:21         ` Bjorn Helgaas
2014-09-10 18:30           ` Will Deacon
2014-09-10 21:58           ` Grant Likely
2014-09-01 14:57 ` [PATCH v3 05/17] ARM64 / ACPI: If we chose to boot from acpi then disable FDT Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 06/17] ARM64 / ACPI: Make PCI optional for ACPI on ARM64 Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 07/17] ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 08/17] ACPI / table: Print GIC information when MADT is parsed Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 09/17] ARM64 / ACPI: Parse MADT for SMP initialization Hanjun Guo
2014-09-03 17:21   ` Lorenzo Pieralisi
2014-09-04 15:29     ` Hanjun Guo
2014-09-09  4:29       ` Jon Masters
2014-09-09  5:11         ` Hanjun Guo
2014-09-09  5:34           ` Jon Masters
2014-09-09 16:52       ` Lorenzo Pieralisi
2014-09-09 17:00         ` Jon Masters
2014-09-09 17:02         ` Jon Masters
2014-09-09  4:23   ` Jon Masters
2014-09-09  4:57     ` Hanjun Guo
2014-09-09  5:44       ` Jon Masters
2014-09-09 16:00         ` Hanjun Guo
2014-09-09 16:04           ` Jon Masters
2014-09-09 16:14             ` Hanjun Guo
2014-09-11 14:15             ` Will Deacon
2014-09-12 21:30               ` Jon Masters
2014-09-11 10:24   ` Grant Likely
2014-09-01 14:57 ` [PATCH v3 10/17] ACPI / processor: Make it possible to get CPU hardware ID via GICC Hanjun Guo
2014-09-03 16:27   ` Lorenzo Pieralisi
2014-09-08 13:10     ` Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 11/17] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi Hanjun Guo
2014-09-11 11:08   ` Grant Likely
2014-09-11 11:34     ` Grant Likely
2014-09-12  9:42     ` Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 12/17] ACPI / table: Add new function to get table entries Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 13/17] ARM64 / ACPI: Add GICv2 specific ACPI boot support Hanjun Guo
2014-09-01 17:35   ` Marc Zyngier
2014-09-02  8:28     ` [Linaro-acpi] " Alexander Spyridakis
2014-09-02 11:48     ` Tomasz Nowicki
2014-09-02 13:02       ` Marc Zyngier
2014-09-02 15:45         ` Hanjun Guo
2014-09-02 15:59           ` Marc Zyngier
2014-09-02 16:11           ` Sudeep Holla
2014-09-03 10:30           ` Marc Zyngier
2014-09-03 11:17             ` Hanjun Guo
2014-09-04 14:03               ` Hanjun Guo
2014-09-09  6:21             ` Jon Masters
2014-09-03  9:26         ` Tomasz Nowicki
2014-09-03 14:57           ` Arnd Bergmann
2014-09-05  8:52             ` Tomasz Nowicki
2014-09-05  9:47             ` Marc Zyngier
2014-09-05 10:13               ` [Linaro-acpi] " Arnd Bergmann
2014-09-05 10:36                 ` Tomasz Nowicki
2014-09-05 10:39                 ` Marc Zyngier
2014-09-05 10:49                   ` Tomasz Nowicki
2014-09-09  6:27             ` Jon Masters
2014-09-11 13:43         ` Grant Likely
2014-09-02 16:34       ` Catalin Marinas
2014-09-11 11:48       ` Grant Likely
2014-09-11 12:01         ` Marc Zyngier
2014-09-09  6:14     ` Jon Masters
2014-09-03 18:42   ` Arnd Bergmann
2014-09-04 10:10     ` Tomasz Nowicki
2014-09-04 10:14       ` Arnd Bergmann
2014-09-04 10:39         ` Tomasz Nowicki
2014-09-09  6:35     ` Jon Masters
2014-09-01 14:57 ` [PATCH v3 14/17] ARM64 / ACPI: Parse GTDT to initialize arch timer Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 15/17] ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 Hanjun Guo
2014-09-01 14:57 ` [PATCH v3 16/17] ARM64 / ACPI: Enable ARM64 in Kconfig Hanjun Guo
2014-09-11 15:18   ` Lorenzo Pieralisi
2014-09-01 14:57 ` [PATCH v3 17/17] Documentation: ACPI for ARM64 Hanjun Guo
2014-09-11 13:29 ` [PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1 Grant Likely
2014-09-11 13:49   ` Will Deacon
2014-09-12 21:38     ` Jon Masters
2014-09-12 21:43       ` Jon Masters
2014-09-15  4:21     ` Grant Likely
2014-09-11 14:23   ` Rafael J. Wysocki
2014-09-11 14:04     ` Grant Likely
2014-09-11 15:37   ` Catalin Marinas
2014-09-11 15:57     ` Sudeep Holla
2014-09-11 16:06       ` Graeme Gregory
2014-09-11 16:14         ` Sudeep Holla
2014-09-15  4:31     ` Grant Likely
2014-09-15  9:15       ` Catalin Marinas
2014-09-15 22:48         ` Grant Likely
2014-09-16 10:12           ` Catalin Marinas
2014-09-11 16:05   ` Olof Johansson
2014-09-15  4:37     ` Grant Likely

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