linux-kernel - Re: [PATCH v5 5/5] xen/acpi: notify xen when reduced hardware sleep is available

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Date:	Fri, 28 Jun 2013 12:05:40 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ben Guthro <benjamin.guthro@...rix.com>
Cc:	Jan Beulich <jbeulich@...e.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, xen-devel@...ts.xen.org
Subject: Re: [PATCH v5 5/5] xen/acpi: notify xen when reduced hardware sleep
 is available

On Fri, Jun 28, 2013 at 09:46:24AM -0400, Ben Guthro wrote:
> Make use of acpi_os_prepare_sleep extended parameter to notify xen
> to make use of the reduced hardware sleep functionality
> 
> The hypervisor change underlying this is commit 62d1a69 ("ACPI: support
> v5 (reduced HW) sleep interface") on the master branch of
> git://xenbits.xen.org/xen.git.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> Signed-off-by: Ben Guthro <benjamin.guthro@...rix.com>
> Cc: Konrad Wilk <konrad.wilk@...cle.com>

Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  drivers/xen/acpi.c               |   25 ++++++++++++-------------
>  include/xen/acpi.h               |    3 +--
>  include/xen/interface/platform.h |    7 ++++---
>  3 files changed, 17 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/xen/acpi.c b/drivers/xen/acpi.c
> index 36d2be1..371dade 100644
> --- a/drivers/xen/acpi.c
> +++ b/drivers/xen/acpi.c
> @@ -35,28 +35,27 @@
>  #include <asm/xen/hypercall.h>
>  #include <asm/xen/hypervisor.h>
>  
> -int xen_acpi_notify_hypervisor_state(u8 sleep_state,
> -				     u32 pm1a_cnt, u32 pm1b_cnt,
> +int xen_acpi_notify_hypervisor_state(u8 sleep_state, u32 val_a, u32 val_b,
>  				     bool extended)
>  {
> +	unsigned int bits = extended ? 8 : 16;
> +
>  	struct xen_platform_op op = {
>  		.cmd = XENPF_enter_acpi_sleep,
>  		.interface_version = XENPF_INTERFACE_VERSION,
> -		.u = {
> -			.enter_acpi_sleep = {
> -				.pm1a_cnt_val = (u16)pm1a_cnt,
> -				.pm1b_cnt_val = (u16)pm1b_cnt,
> -				.sleep_state = sleep_state,
> -			},
> +		.u.enter_acpi_sleep = {
> +			.val_a = (u16)val_a,
> +			.val_b = (u16)val_b,
> +			.sleep_state = sleep_state,
> +			.flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
>  		},
>  	};
>  
> -	if ((pm1a_cnt & 0xffff0000) || (pm1b_cnt & 0xffff0000)) {
> -		WARN(1, "Using more than 16bits of PM1A/B 0x%x/0x%x!"
> -		     "Email xen-devel@...ts.xensource.com  Thank you.\n", \
> -		     pm1a_cnt, pm1b_cnt);
> +	if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
> +		 "Using more than %u bits of sleep control values %#x/%#x!"
> +		 "Email xen-devel@...ts.xen.org - Thank you.\n", \
> +		 bits, val_a, val_b))
>  		return -1;
> -	}
>  
>  	HYPERVISOR_dom0_op(&op);
>  	return 1;
> diff --git a/include/xen/acpi.h b/include/xen/acpi.h
> index 9f7e2e6..a2d5667 100644
> --- a/include/xen/acpi.h
> +++ b/include/xen/acpi.h
> @@ -75,8 +75,7 @@ static inline int xen_acpi_get_pxm(acpi_handle h)
>  	return -ENXIO;
>  }
>  
> -int xen_acpi_notify_hypervisor_state(u8 sleep_state,
> -				     u32 pm1a_cnt, u32 pm1b_cnd,
> +int xen_acpi_notify_hypervisor_state(u8 sleep_state, u32 val_a, u32 val_b,
>  				     bool extended);
>  
>  static inline void xen_acpi_sleep_register(void)
> diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
> index c57d5f6..f1331e3 100644
> --- a/include/xen/interface/platform.h
> +++ b/include/xen/interface/platform.h
> @@ -152,10 +152,11 @@ DEFINE_GUEST_HANDLE_STRUCT(xenpf_firmware_info_t);
>  #define XENPF_enter_acpi_sleep    51
>  struct xenpf_enter_acpi_sleep {
>  	/* IN variables */
> -	uint16_t pm1a_cnt_val;      /* PM1a control value. */
> -	uint16_t pm1b_cnt_val;      /* PM1b control value. */
> +	uint16_t val_a;             /* PM1a control / sleep type A. */
> +	uint16_t val_b;             /* PM1b control / sleep type B. */
>  	uint32_t sleep_state;       /* Which state to enter (Sn). */
> -	uint32_t flags;             /* Must be zero. */
> +#define XENPF_ACPI_SLEEP_EXTENDED 0x00000001
> +	uint32_t flags;             /* XENPF_ACPI_SLEEP_*. */
>  };
>  DEFINE_GUEST_HANDLE_STRUCT(xenpf_enter_acpi_sleep_t);
>  
> -- 
> 1.7.9.5
> 
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