> -----Original Message----- > From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx] > Sent: Friday, February 03, 2012 12:05 PM > To: Cihula, Joseph > Cc: linux-kernel@xxxxxxxxxxxxxxx; rjw@xxxxxxx; x86@xxxxxxxxxx; Brown, Len; linux-pm@lists.linux- > foundation.org; tboot-devel@xxxxxxxxxxxxxxxxxxxxx; linux-acpi@xxxxxxxxxxxxxxx; > liang.tang@xxxxxxxxxx; hpa@xxxxxxxxx > Subject: Re: [PATCH 2/7] tboot: Add return values for tboot_sleep > > On Thu, Jan 26, 2012 at 12:16:39AM +0000, Cihula, Joseph wrote: > > > From: Konrad Rzeszutek Wilk [mailto:konrad.wilk@xxxxxxxxxx] > > > Sent: Thursday, January 12, 2012 12:23 PM > > eturn values for tboot_sleep > > > > > > On Thu, Jan 12, 2012 at 09:49:58AM -0800, Konrad Rzeszutek Wilk wrote: > > > > On Tue, Jan 10, 2012 at 08:10:53PM +0000, Cihula, Joseph wrote: > > > > > ACK, but tboot_sleep() calls tboot_shutdown() and there are > > > > > error conditions in that which you > > > are not reflecting upward--i.e. you should make tboot_shutdown() > > > return an 'int' and propagate its errors through tboot_sleep(). > > > > > > > > Hey Joe, > > > > > > > > Thanks for looking at the patches. > > > > > > > > Right now [with this patch applied] the code looks as so: > > > > > > > > 297 > > > > 298 tboot_shutdown(acpi_shutdown_map[sleep_state]); > > > > 299 return 0; > > > > 300 } > > > > > > > > > > > > If we do make tboot_shutdown() return an int, there will be a need > > > > to modify other callers: native_machine_emergency_restart, > > > > native_machine_halt, native_machine_power_off, and native_play_dead as well. > > > > > > > > Perhaps that could be done in another patch and leave this one as > > > > is where the 'tboot_sleep' would just return 0 instead of 'return > > > > tboot_shutdown(...)' ? > > > > > > > > Perhaps another way to do this is to extract the common code of > > > > tboot_sleep and tboot_shutdown? > > > > I'd be happier to see the callers above changed to handle a tboot_shutdown() that returned an > error than splitting this up and only checking the error in one path. > > OK, so something like this then: Looks good. Joe > > From da60a441fd62aee83763758455c08c281893ae93 Mon Sep 17 00:00:00 2001 > From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > Date: Thu, 8 Dec 2011 17:14:08 +0800 > Subject: [PATCH] tboot: Add return values for tboot_sleep and consequently tboot_shutdown > > .. as appropiately. As tboot_sleep now returns values. > remove tboot_sleep_wrapper. > > Suggested-by: "Rafael J. Wysocki" <rjw@xxxxxxx> > Acked-by: Joseph Cihula <joseph.cihula@xxxxxxxxx> > [v1: Return -1/0/+1 instead of ACPI_xx values] > [v2: Also make tboot_shutdown return error code] > Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> > --- > arch/x86/kernel/reboot.c | 6 +++--- > arch/x86/kernel/smpboot.c | 2 +- > arch/x86/kernel/tboot.c | 33 +++++++++++++++------------------ > include/linux/tboot.h | 4 ++-- > 4 files changed, 21 insertions(+), 24 deletions(-) > > diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 37a458b..b29326a 100644 > --- a/arch/x86/kernel/reboot.c > +++ b/arch/x86/kernel/reboot.c > @@ -549,7 +549,7 @@ static void native_machine_emergency_restart(void) > if (reboot_emergency) > emergency_vmx_disable_all(); > > - tboot_shutdown(TB_SHUTDOWN_REBOOT); > + WARN_ON(tboot_shutdown(TB_SHUTDOWN_REBOOT)); > > /* Tell the BIOS if we want cold or warm reboot */ > *((unsigned short *)__va(0x472)) = reboot_mode; @@ -684,7 +684,7 @@ static void > native_machine_halt(void) > /* stop other cpus and apics */ > machine_shutdown(); > > - tboot_shutdown(TB_SHUTDOWN_HALT); > + WARN_ON(tboot_shutdown(TB_SHUTDOWN_HALT)); > > /* stop this cpu */ > stop_this_cpu(NULL); > @@ -698,7 +698,7 @@ static void native_machine_power_off(void) > pm_power_off(); > } > /* a fallback in case there is no PM info available */ > - tboot_shutdown(TB_SHUTDOWN_HALT); > + WARN_ON(tboot_shutdown(TB_SHUTDOWN_HALT)); > } > > struct machine_ops machine_ops = { > diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 66d250c..9aa903a 100644 > --- a/arch/x86/kernel/smpboot.c > +++ b/arch/x86/kernel/smpboot.c > @@ -1419,7 +1419,7 @@ static inline void hlt_play_dead(void) void native_play_dead(void) { > play_dead_common(); > - tboot_shutdown(TB_SHUTDOWN_WFS); > + WARN_ON(tboot_shutdown(TB_SHUTDOWN_WFS)); > > mwait_play_dead(); /* Only returns on failure */ > hlt_play_dead(); > diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 1a4ab7d..9504a7a 100644 > --- a/arch/x86/kernel/tboot.c > +++ b/arch/x86/kernel/tboot.c > @@ -217,12 +217,12 @@ static int tboot_setup_sleep(void) > > #endif > > -void tboot_shutdown(u32 shutdown_type) > +int tboot_shutdown(u32 shutdown_type) > { > void (*shutdown)(void); > > if (!tboot_enabled()) > - return; > + return 0; > > /* > * if we're being called before the 1:1 mapping is set up then just @@ -230,13 +230,14 @@ > void tboot_shutdown(u32 shutdown_type) > * due to very early panic() > */ > if (!tboot_pg_dir) > - return; > + return 0; > > /* if this is S3 then set regions to MAC */ > - if (shutdown_type == TB_SHUTDOWN_S3) > - if (tboot_setup_sleep()) > - return; > - > + if (shutdown_type == TB_SHUTDOWN_S3) { > + int rc = tboot_setup_sleep(); > + if (rc) > + return rc; > + } > tboot->shutdown_type = shutdown_type; > > switch_to_tboot_pt(); > @@ -247,6 +248,8 @@ void tboot_shutdown(u32 shutdown_type) > /* should not reach here */ > while (1) > halt(); > + > + return 0; > } > > static void tboot_copy_fadt(const struct acpi_table_fadt *fadt) @@ -272,7 +275,7 @@ 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) > +static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 > +pm1b_control) > { > static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = { > /* S0,1,2: */ -1, -1, -1, > @@ -281,7 +284,7 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) > /* S5: */ TB_SHUTDOWN_S5 }; > > if (!tboot_enabled()) > - return; > + return 0; > > tboot_copy_fadt(&acpi_gbl_FADT); > tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control; @@ -292,16 +295,10 @@ 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 -1; > } > > - tboot_shutdown(acpi_shutdown_map[sleep_state]); > -} > -static int tboot_sleep_wrapper(u8 sleep_state, u32 pm1a_control, > - u32 pm1b_control) > -{ > - tboot_sleep(sleep_state, pm1a_control, pm1b_control); > - return 0; > + return tboot_shutdown(acpi_shutdown_map[sleep_state]); > } > > static atomic_t ap_wfs_count; > @@ -352,7 +349,7 @@ static __init int tboot_late_init(void) > atomic_set(&ap_wfs_count, 0); > register_hotcpu_notifier(&tboot_cpu_notifier); > > - acpi_os_set_prepare_sleep(&tboot_sleep_wrapper); > + acpi_os_set_prepare_sleep(&tboot_sleep); > return 0; > } > > diff --git a/include/linux/tboot.h b/include/linux/tboot.h index c75128b..8f14fe0 100644 > --- a/include/linux/tboot.h > +++ b/include/linux/tboot.h > @@ -142,7 +142,7 @@ static inline int tboot_enabled(void) } > > extern void tboot_probe(void); > -extern void tboot_shutdown(u32 shutdown_type); > +extern int tboot_shutdown(u32 shutdown_type); > extern struct acpi_table_header *tboot_get_dmar_table( > struct acpi_table_header *dmar_tbl); extern int > tboot_force_iommu(void); @@ -151,7 +151,7 @@ extern int tboot_force_iommu(void); > > #define tboot_enabled() 0 > #define tboot_probe() do { } while (0) > -#define tboot_shutdown(shutdown_type) do { } while (0) > +#define tboot_shutdown(shutdown_type) 0 > #define tboot_sleep(sleep_state, pm1a_control, pm1b_control) \ > do { } while (0) > #define tboot_get_dmar_table(dmar_tbl) (dmar_tbl) > -- > 1.7.7.5 _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/linux-pm
