From 09f98a825a821f7a3f1b162f9ed023f37213a63b Mon Sep 17 00:00:00 2001 From: Tang Liang Date: Fri, 9 Dec 2011 10:05:54 +0800 Subject: x86, acpi, tboot: Have a ACPI os prepare sleep 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: Len Brown Acked-by: Joseph Cihula Acked-by: Rafael J. Wysocki [v1: Added __attribute__ ((unused))] [v2: Introduced a wrapper instead of changing tboot_sleep return values] [v3: Added return value AE_CTRL_SKIP for acpi_os_sleep_prepare] Signed-off-by: Tang Liang [v1: Fix compile issues on IA64 and PPC64] [v2: Fix where __acpi_os_prepare_sleep==NULL and did not go in sleep properly] Signed-off-by: Konrad Rzeszutek Wilk --- arch/x86/kernel/tboot.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'arch/x86/kernel') diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index e2410e27f97e..1a4ab7df5b63 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -297,6 +297,12 @@ void tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) 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; +} static atomic_t ap_wfs_count; @@ -345,6 +351,8 @@ 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); return 0; } -- cgit v1.2.3 From a1f37788a6d8c037e7d92fe4a0fe9ec0d713b21e Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Thu, 8 Dec 2011 17:14:08 +0800 Subject: tboot: Add return values for tboot_sleep .. as appropiately. As tboot_sleep now returns values. remove tboot_sleep_wrapper. Suggested-and-Acked-by: Rafael J. Wysocki Acked-by: Joseph Cihula [v1: Return -1/0/+1 instead of ACPI_xx values] Signed-off-by: Konrad Rzeszutek Wilk --- arch/x86/kernel/tboot.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) (limited to 'arch/x86/kernel') diff --git a/arch/x86/kernel/tboot.c b/arch/x86/kernel/tboot.c index 1a4ab7df5b63..6410744ac5cb 100644 --- a/arch/x86/kernel/tboot.c +++ b/arch/x86/kernel/tboot.c @@ -272,7 +272,7 @@ 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 +281,7 @@ 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; @@ -292,15 +292,10 @@ 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; } @@ -352,7 +347,7 @@ 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; } -- cgit v1.2.3 From 1a022e3f1be11730bd8747b1af96a0274bf6356e Mon Sep 17 00:00:00 2001 From: Boris Ostrovsky Date: Tue, 13 Mar 2012 19:55:09 +0100 Subject: idle, x86: Allow off-lined CPU to enter deeper C states Currently when a CPU is off-lined it enters either MWAIT-based idle or, if MWAIT is not desired or supported, HLT-based idle (which places the processor in C1 state). This patch allows processors without MWAIT support to stay in states deeper than C1. Signed-off-by: Boris Ostrovsky Signed-off-by: Len Brown --- arch/x86/kernel/smpboot.c | 4 +++- drivers/acpi/processor_idle.c | 31 +++++++++++++++++++++++++++++++ drivers/cpuidle/cpuidle.c | 28 ++++++++++++++++++++++++++++ include/linux/cpuidle.h | 5 +++++ 4 files changed, 67 insertions(+), 1 deletion(-) (limited to 'arch/x86/kernel') diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 66d250c00d11..93a2a0932b51 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -50,6 +50,7 @@ #include #include #include +#include #include #include @@ -1422,7 +1423,8 @@ void native_play_dead(void) tboot_shutdown(TB_SHUTDOWN_WFS); mwait_play_dead(); /* Only returns on failure */ - hlt_play_dead(); + if (cpuidle_play_dead()) + hlt_play_dead(); } #else /* ... !CONFIG_HOTPLUG_CPU */ diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 0e8e2de2ed3e..6b1d32a161ae 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -770,6 +770,35 @@ static int acpi_idle_enter_c1(struct cpuidle_device *dev, return index; } + +/** + * acpi_idle_play_dead - enters an ACPI state for long-term idle (i.e. off-lining) + * @dev: the target CPU + * @index: the index of suggested state + */ +static int acpi_idle_play_dead(struct cpuidle_device *dev, int index) +{ + struct cpuidle_state_usage *state_usage = &dev->states_usage[index]; + struct acpi_processor_cx *cx = cpuidle_get_statedata(state_usage); + + ACPI_FLUSH_CPU_CACHE(); + + while (1) { + + if (cx->entry_method == ACPI_CSTATE_HALT) + halt(); + else if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) { + inb(cx->address); + /* See comment in acpi_idle_do_entry() */ + inl(acpi_gbl_FADT.xpm_timer_block.address); + } else + return -ENODEV; + } + + /* Never reached */ + return 0; +} + /** * acpi_idle_enter_simple - enters an ACPI state without BM handling * @dev: the target CPU @@ -1077,12 +1106,14 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr) state->flags |= CPUIDLE_FLAG_TIME_VALID; state->enter = acpi_idle_enter_c1; + state->enter_dead = acpi_idle_play_dead; drv->safe_state_index = count; break; case ACPI_STATE_C2: state->flags |= CPUIDLE_FLAG_TIME_VALID; state->enter = acpi_idle_enter_simple; + state->enter_dead = acpi_idle_play_dead; drv->safe_state_index = count; break; diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index f7cab5e9c4d6..3e146b2ada4a 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -71,6 +71,34 @@ typedef int (*cpuidle_enter_t)(struct cpuidle_device *dev, static cpuidle_enter_t cpuidle_enter_ops; +/** + * cpuidle_play_dead - cpu off-lining + * + * Only returns in case of an error + */ +int cpuidle_play_dead(void) +{ + struct cpuidle_device *dev = __this_cpu_read(cpuidle_devices); + struct cpuidle_driver *drv = cpuidle_get_driver(); + int i, dead_state = -1; + int power_usage = -1; + + /* Find lowest-power state that supports long-term idle */ + for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) { + struct cpuidle_state *s = &drv->states[i]; + + if (s->power_usage < power_usage && s->enter_dead) { + power_usage = s->power_usage; + dead_state = i; + } + } + + if (dead_state != -1) + return drv->states[dead_state].enter_dead(dev, dead_state); + + return -ENODEV; +} + /** * cpuidle_idle_call - the main idle loop * diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index f3ebbba368b3..d557bcd0ada7 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -51,6 +51,8 @@ struct cpuidle_state { int (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv, int index); + + int (*enter_dead) (struct cpuidle_device *dev, int index); }; /* Idle State Flags */ @@ -147,6 +149,8 @@ extern int cpuidle_wrap_enter(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index, int (*enter)(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index)); +extern int cpuidle_play_dead(void); + #else static inline void disable_cpuidle(void) { } static inline int cpuidle_idle_call(void) { return -ENODEV; } @@ -168,6 +172,7 @@ static inline int cpuidle_wrap_enter(struct cpuidle_device *dev, int (*enter)(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index)) { return -ENODEV; } +static inline int cpuidle_play_dead(void) {return -ENODEV; } #endif -- cgit v1.2.3 From ac909ec308ce8d5177963c780564824d12bc3fa2 Mon Sep 17 00:00:00 2001 From: Petr Vandrovec Date: Thu, 8 Mar 2012 13:33:24 -0800 Subject: ACPI: Fix use-after-free in acpi_map_lsapic When processor is being hot-added to the system, acpi_map_lsapic invokes ACPI _MAT method to find APIC ID and flags, verifies that returned structure is indeed ACPI's local APIC structure, and that flags contain MADT_ENABLED bit. Then saves APIC ID, frees structure - and accesses structure when computing arguments for acpi_register_lapic call. Which sometime leads to acpi_register_lapic call being made with second argument zero, failing to bring processor online with error 'Unable to map lapic to logical cpu number'. As lapic->lapic_flags & ACPI_MADT_ENABLED was already confirmed to be non-zero few lines above, we can just pass unconditional ACPI_MADT_ENABLED to the acpi_register_lapic. Signed-off-by: Petr Vandrovec Signed-off-by: Alok N Kataria Reviewed-by: Toshi Kani Signed-off-by: Len Brown --- arch/x86/kernel/acpi/boot.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/x86/kernel') diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index ce664f33ea8e..bbcc2c389ade 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -642,6 +642,7 @@ static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu) kfree(buffer.pointer); buffer.length = ACPI_ALLOCATE_BUFFER; buffer.pointer = NULL; + lapic = NULL; if (!alloc_cpumask_var(&tmp_map, GFP_KERNEL)) goto out; @@ -650,7 +651,7 @@ static int __cpuinit _acpi_map_lsapic(acpi_handle handle, int *pcpu) goto free_tmp_map; cpumask_copy(tmp_map, cpu_present_mask); - acpi_register_lapic(physid, lapic->lapic_flags & ACPI_MADT_ENABLED); + acpi_register_lapic(physid, ACPI_MADT_ENABLED); /* * If mp_register_lapic successfully generates a new logical cpu -- cgit v1.2.3