linux-kernel - Re: [PATCH v2 1/5] apei, mce: Factor out APEI architecture specific MCE calls.

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Date:	Thu, 12 Jun 2014 12:23:19 +0200
From:	Robert Richter <rric@...nel.org>
To:	Tomasz Nowicki <tomasz.nowicki@...aro.org>
Cc:	rjw@...ysocki.net, lenb@...nel.org, tony.luck@...el.com,
	bp@...en8.de, m.chehab@...sung.com, bp@...e.de,
	linux-edac@...r.kernel.org, x86@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	linaro-acpi@...ts.linaro.org
Subject: Re: [PATCH v2 1/5] apei, mce: Factor out APEI architecture specific
 MCE calls.

On 28.05.14 09:39:26, Tomasz Nowicki wrote:
> This commit abstracts MCE calls and provides weak corresponding default
> implementation for those architectures which do not need arch specific
> actions. Each platform willing to do additional architectural actions
> should provides desired function definition. It allows us to avoid wrap
> code into #ifdef in generic code and prevent new platform from introducing
> dummy stub function too.
> 
> Initially, there are two APEI arch-specific calls:
> - apei_arch_enable_cmcff()
> - apei_arch_report_mem_error()
> Both interact with MCE driver for X86 architecture.
> 
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@...aro.org>
> ---
>  arch/x86/kernel/acpi/Makefile |    1 +
>  arch/x86/kernel/acpi/apei.c   |   56 +++++++++++++++++++++++++++++++++++++++++
>  drivers/acpi/apei/apei-base.c |   13 ++++++++++
>  drivers/acpi/apei/ghes.c      |    6 ++---
>  drivers/acpi/apei/hest.c      |   26 +------------------
>  include/acpi/apei.h           |    3 +++
>  6 files changed, 76 insertions(+), 29 deletions(-)
>  create mode 100644 arch/x86/kernel/acpi/apei.c

>  static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data)
>  {
> -#ifdef CONFIG_X86_MCE
> -	int i;
> -	struct acpi_hest_ia_corrected *cmc;
> -	struct acpi_hest_ia_error_bank *mc_bank;
> -
> -	if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK)
> -		return 0;
> -
> -	cmc = (struct acpi_hest_ia_corrected *)hest_hdr;
> -	if (!cmc->enabled)
> +	if (!apei_arch_enable_cmcff(hest_hdr, data))
>  		return 0;

This could be a tail call:

	return apei_arch_enable_cmcff(...);

Otherwise the patch looks good to me.

-Robert

>  
> -	/*
> -	 * We expect HEST to provide a list of MC banks that report errors
> -	 * in firmware first mode. Otherwise, return non-zero value to
> -	 * indicate that we are done parsing HEST.
> -	 */
> -	if (!(cmc->flags & ACPI_HEST_FIRMWARE_FIRST) || !cmc->num_hardware_banks)
> -		return 1;
> -
> -	pr_info(HEST_PFX "Enabling Firmware First mode for corrected errors.\n");
> -
> -	mc_bank = (struct acpi_hest_ia_error_bank *)(cmc + 1);
> -	for (i = 0; i < cmc->num_hardware_banks; i++, mc_bank++)
> -		mce_disable_bank(mc_bank->bank_number);
> -#endif
>  	return 1;
>  }
--
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