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Date: Thu, 29 Sep 2011 20:28:16 +0000
From: "Cihula, Joseph" <joseph.cihula@...el.com>
To: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"rjw@...k.pl" <rjw@...k.pl>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
"Brown, Len" <len.brown@...el.com>,
"Wang, Shane" <shane.wang@...el.com>,
"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
"linux-pm@...ts.linux-foundation.org"
<linux-pm@...ts.linux-foundation.org>,
"tboot-devel@...ts.sourceforge.net"
<tboot-devel@...ts.sourceforge.net>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"liang.tang@...cle.com" <liang.tang@...cle.com>,
"Yu, Ke" <ke.yu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
"jeremy@...p.org" <jeremy@...p.org>
Subject: RE: [PATCH 2/8] x86, acpi, tboot: Have a ACPI sleep override
instead of calling tboot_sleep.
ACK.
> -----Original Message-----
> From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@...cle.com]
> Sent: Thursday, September 29, 2011 1:17 PM
> To: linux-kernel@...r.kernel.org; rjw@...k.pl; tglx@...utronix.de; hpa@...or.com; x86@...nel.org;
> Brown, Len; Cihula, Joseph; Wang, Shane; xen-devel@...ts.xensource.com; linux-pm@...ts.linux-
> foundation.org; tboot-devel@...ts.sourceforge.net; linux-acpi@...r.kernel.org;
> liang.tang@...cle.com; Yu, Ke; Tian, Kevin; jeremy@...p.org
> Cc: Konrad Rzeszutek Wilk
> Subject: [PATCH 2/8] x86, acpi, tboot: Have a ACPI sleep override instead of calling tboot_sleep.
>
> The ACPI suspend path makes a call to tboot_sleep right before it writes the PM1A, PM1B values. We
> replace the direct call to tboot via an registration callback similar to __acpi_register_gsi.
>
> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: "H. Peter Anvin" <hpa@...or.com>
> CC: x86@...nel.org
> CC: Len Brown <len.brown@...el.com>
> CC: Joseph Cihula <joseph.cihula@...el.com>
> CC: Shane Wang <shane.wang@...el.com>
> CC: xen-devel@...ts.xensource.com
> CC: linux-pm@...ts.linux-foundation.org
> CC: tboot-devel@...ts.sourceforge.net
> CC: linux-acpi@...r.kernel.org
> [v1: Added __attribute__ ((unused))]
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
> arch/x86/include/asm/acpi.h | 4 ++++
> arch/x86/kernel/acpi/boot.c | 4 ++++
> arch/x86/kernel/tboot.c | 14 ++++++++++----
> drivers/acpi/acpica/hwsleep.c | 12 ++++++++++--
> include/linux/tboot.h | 3 ++-
> 5 files changed, 30 insertions(+), 7 deletions(-)
>
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h index 610001d..0a46696
> 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -98,6 +98,10 @@ void acpi_pic_sci_set_trigger(unsigned int, u16); extern int
> (*__acpi_register_gsi)(struct device *dev, u32 gsi,
> int trigger, int polarity);
>
> +extern int (*__acpi_override_sleep)(u8 sleep_state, u32 pm1a_ctrl,
> + u32 pm1b_ctrl, bool *skip_rest) \
> + __attribute__ ((unused));
> +
> static inline void disable_acpi(void)
> {
> acpi_disabled = 1;
> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index 4558f0d..7f30806
> 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -552,6 +552,10 @@ static int acpi_register_gsi_ioapic(struct device *dev, u32 gsi, int
> (*__acpi_register_gsi)(struct device *dev, u32 gsi,
> int trigger, int polarity) = acpi_register_gsi_pic;
>
> +int (*__acpi_override_sleep)(u8 sleep_state, u32 pm1a_ctrl,
> + u32 pm1b_ctrl, bool *skip_rest) \
> + __attribute__ ((unused)) = NULL;
> +
> /*
> * success: return IRQ number (>=0)
> * failure: return < 0
> diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index e07a2fc..a6c0a30 100644
> --- a/arch/x86/kernel/tboot.c
> +++ b/arch/x86/kernel/tboot.c
> @@ -42,7 +42,7 @@
> #include <asm/setup.h>
> #include <asm/e820.h>
> #include <asm/io.h>
> -
> +#include <linux/acpi.h>
> #include "acpi/realmode/wakeup.h"
>
> /* Global pointer to shared data; NULL means no measured launch. */ @@ -271,7 +271,9 @@ static
> void tboot_copy_fadt(const struct acpi_table_fadt *fadt)
> offsetof(struct acpi_table_facs, firmware_waking_vector); }
>
> -void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
> +
> +int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control,
> + bool *skip_rest)
> {
> static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = {
> /* S0,1,2: */ -1, -1, -1,
> @@ -280,7 +282,7 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control)
> /* S5: */ TB_SHUTDOWN_S5 };
>
> if (!tboot_enabled())
> - return;
> + return AE_OK;
>
> tboot_copy_fadt(&acpi_gbl_FADT);
> tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control; @@ -291,10 +293,12 @@ void tboot_sleep(u8
> sleep_state, u32 pm1a_control, u32 pm1b_control)
> if (sleep_state >= ACPI_S_STATE_COUNT ||
> acpi_shutdown_map[sleep_state] == -1) {
> pr_warning("unsupported sleep state 0x%x\n", sleep_state);
> - return;
> + return AE_ERROR;
> }
>
> tboot_shutdown(acpi_shutdown_map[sleep_state]);
> +
> + return AE_OK;
> }
>
> static atomic_t ap_wfs_count;
> @@ -344,6 +348,8 @@ static __init int tboot_late_init(void)
>
> atomic_set(&ap_wfs_count, 0);
> register_hotcpu_notifier(&tboot_cpu_notifier);
> +
> + __acpi_override_sleep = tboot_sleep;
> return 0;
> }
>
> diff --git a/drivers/acpi/acpica/hwsleep.c b/drivers/acpi/acpica/hwsleep.c index 2ac28bb..31d1198
> 100644
> --- a/drivers/acpi/acpica/hwsleep.c
> +++ b/drivers/acpi/acpica/hwsleep.c
> @@ -45,7 +45,6 @@
> #include <acpi/acpi.h>
> #include "accommon.h"
> #include "actables.h"
> -#include <linux/tboot.h>
>
> #define _COMPONENT ACPI_HARDWARE
> ACPI_MODULE_NAME("hwsleep")
> @@ -343,8 +342,17 @@ acpi_status asmlinkage acpi_enter_sleep_state(u8 sleep_state)
>
> ACPI_FLUSH_CPU_CACHE();
>
> - tboot_sleep(sleep_state, pm1a_control, pm1b_control);
> + if (__acpi_override_sleep) {
> + bool skip_rest = false;
>
> + status = __acpi_override_sleep(sleep_state, pm1a_control,
> + pm1b_control, &skip_rest);
> +
> + if (ACPI_FAILURE(status))
> + return_ACPI_STATUS(status);
> + if (skip_rest)
> + return_ACPI_STATUS(AE_OK);
> + }
> /* Write #2: Write both SLP_TYP + SLP_EN */
>
> status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control); diff --git
> a/include/linux/tboot.h b/include/linux/tboot.h index 1dba6ee..1216698 100644
> --- a/include/linux/tboot.h
> +++ b/include/linux/tboot.h
> @@ -143,7 +143,8 @@ static inline int tboot_enabled(void)
>
> extern void tboot_probe(void);
> extern void tboot_shutdown(u32 shutdown_type); -extern void tboot_sleep(u8 sleep_state, u32
> pm1a_control, u32 pm1b_control);
> +extern int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control,
> + bool *skip_rest) __attribute__ ((unused));
> extern struct acpi_table_header *tboot_get_dmar_table(
> struct acpi_table_header *dmar_tbl); extern int
> tboot_force_iommu(void);
> --
> 1.7.4.1
--
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