linux-kernel - Re: [PATCH v3 1/3] acpi: Call acpi_os_prepare_sleep hook in reduced hardware sleep path

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Message-Id: <51CB19C602000078000E0D75@nat28.tlf.novell.com>
Date:	Wed, 26 Jun 2013 15:41:42 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Ben Guthro" <benjamin.guthro@...rix.com>
Cc:	"Bob Moore" <robert.moore@...el.com>, <xen-devel@...ts.xen.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>,
	"Rafaell J . Wysocki" <rjw@...k.pl>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] acpi: Call acpi_os_prepare_sleep hook in
 reduced hardware sleep path

>>> On 26.06.13 at 16:06, Ben Guthro <benjamin.guthro@...rix.com> wrote:
> In version 3.4 acpi_os_prepare_sleep() got introduced in parallel with
> reduced hardware sleep support, and the two changes didn't get
> synchronized: The new code doesn't call the hook function (if so
> requested). Fix this, requiring a parameter to be added to the
> hook function to distinguish "extended" from "legacy" sleep.
> 
> Signed-off-by: Ben Guthro <benjamin.guthro@...rix.com>
> Signed-off-by: Jan Beulich <jbeulich@...e.com>

I think these are intended to reflect the flow of things, so
should be reversed (also in the other patches).

> --- a/drivers/acpi/acpica/hwesleep.c
> +++ b/drivers/acpi/acpica/hwesleep.c
> @@ -43,6 +43,7 @@
>   */
>  
>  #include <acpi/acpi.h>
> +#include <linux/acpi.h>

This also got complaints, so I'd be very surprised if they took it now.

>  #include "accommon.h"
>  
>  #define _COMPONENT          ACPI_HARDWARE
> @@ -128,6 +129,13 @@ acpi_status acpi_hw_extended_sleep(u8 sleep_state)
>  
>  	ACPI_FLUSH_CPU_CACHE();
>  
> +	status = acpi_os_prepare_sleep(sleep_state, acpi_gbl_sleep_type_a,
> +				       acpi_gbl_sleep_type_b, true);

Without using "bool", using "true" and "false" is wrong (should
be TRUE and FALSE afaict).

> --- a/drivers/acpi/acpica/hwsleep.c
> +++ b/drivers/acpi/acpica/hwsleep.c
> @@ -153,7 +153,7 @@ acpi_status acpi_hw_legacy_sleep(u8 sleep_state)
>  	ACPI_FLUSH_CPU_CACHE();
>  
>  	status = acpi_os_prepare_sleep(sleep_state, pm1a_control,
> -				       pm1b_control);
> +				       pm1b_control, false);

Same here.

>  	if (ACPI_SKIP(status))
>  		return_ACPI_STATUS(AE_OK);
>  	if (ACPI_FAILURE(status))

And the split point ought to be here - everything below doesn't
modify ACPI CA code. Which in particular means that ...

> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -477,11 +477,11 @@ static inline bool acpi_driver_match_device(struct device *dev,
>  #endif	/* !CONFIG_ACPI */
>  
>  #ifdef CONFIG_ACPI
> -void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state,
> -			       u32 pm1a_ctrl,  u32 pm1b_ctrl));
> +void acpi_os_set_prepare_sleep(int (*func)(u8 sleep_state, u32 val_a,
> +					   u32 val_b, u8 extended));
>  
> -acpi_status acpi_os_prepare_sleep(u8 sleep_state,
> -				  u32 pm1a_control, u32 pm1b_control);
> +acpi_status acpi_os_prepare_sleep(u8 sleep_state, u32 val_a, u32 val_b,
> +				  u8 extended);

... this needs to be moved elsewhere (under include/acpi/), but the
two incarnations of acpi_os_set_prepare_sleep() should presumably
remain here.

Jan

>  #ifdef CONFIG_X86
>  void arch_reserve_mem_area(acpi_physical_address addr, size_t size);
>  #else
> @@ -491,7 +491,7 @@ static inline void arch_reserve_mem_area(acpi_physical_address addr,
>  }
>  #endif /* CONFIG_X86 */
>  #else
> -#define acpi_os_set_prepare_sleep(func, pm1a_ctrl, pm1b_ctrl) do { } while (0)
> +#define acpi_os_set_prepare_sleep(func, val_a, val_b, ext) do { } while (0)
>  #endif
>  
>  #if defined(CONFIG_ACPI) && defined(CONFIG_PM_RUNTIME)


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