--- /dev/null
+#ifndef _ASM_POWERPC_CPUIDLE_H
+#define _ASM_POWERPC_CPUIDLE_H
+
+#ifdef CONFIG_PPC_POWERNV
+/* Used in powernv idle state management */
+#define PNV_THREAD_RUNNING 0
+#define PNV_THREAD_NAP 1
+#define PNV_THREAD_SLEEP 2
+#define PNV_THREAD_WINKLE 3
+#define PNV_CORE_IDLE_LOCK_BIT 0x100
+#define PNV_CORE_IDLE_THREAD_BITS 0x0FF
+
+#ifndef __ASSEMBLY__
+extern u32 pnv_fastsleep_workaround_at_entry[];
+extern u32 pnv_fastsleep_workaround_at_exit[];
+#endif
+
+#endif
+
+#endif
#define OPAL_PCI_ERR_INJECT 96
#define OPAL_PCI_EEH_FREEZE_SET 97
#define OPAL_HANDLE_HMI 98
+#define OPAL_CONFIG_CPU_IDLE_STATE 99
#define OPAL_REGISTER_DUMP_REGION 101
#define OPAL_UNREGISTER_DUMP_REGION 102
#define OPAL_WRITE_TPO 103
*/
#define OPAL_PM_NAP_ENABLED 0x00010000
#define OPAL_PM_SLEEP_ENABLED 0x00020000
+#define OPAL_PM_SLEEP_ENABLED_ER1 0x00080000
#ifndef __ASSEMBLY__
u64 tm_scratch; /* TM scratch area for reclaim */
#endif
+#ifdef CONFIG_PPC_POWERNV
+ /* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
+ u32 *core_idle_state_ptr;
+ u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */
+ /* Mask to indicate thread id in core */
+ u8 thread_mask;
+#endif
+
#ifdef CONFIG_PPC_BOOK3S_64
/* Exclusive emergency stack pointer for machine check exception. */
void *mc_emergency_sp;
extern int powersave_nap; /* set if nap mode can be used in idle loop */
extern unsigned long power7_nap(int check_irq);
-extern void power7_sleep(void);
+extern unsigned long power7_sleep(void);
extern void flush_instruction_cache(void);
extern void hard_reset_now(void);
extern void poweroff_now(void);
arch.timing_last_enter.tv32.tbl));
#endif
+#ifdef CONFIG_PPC_POWERNV
+ DEFINE(PACA_CORE_IDLE_STATE_PTR,
+ offsetof(struct paca_struct, core_idle_state_ptr));
+ DEFINE(PACA_THREAD_IDLE_STATE,
+ offsetof(struct paca_struct, thread_idle_state));
+ DEFINE(PACA_THREAD_MASK,
+ offsetof(struct paca_struct, thread_mask));
+#endif
+
return 0;
}
#include <asm/hw_irq.h>
#include <asm/exception-64s.h>
#include <asm/ptrace.h>
+#include <asm/cpuidle.h>
/*
* We layout physical memory as follows:
rlwinm. r13,r13,47-31,30,31
beq 9f
- /* waking up from powersave (nap) state */
- cmpwi cr1,r13,2
- /* Total loss of HV state is fatal, we could try to use the
- * PIR to locate a PACA, then use an emergency stack etc...
- * OPAL v3 based powernv platforms have new idle states
- * which fall in this catagory.
- */
- bgt cr1,8f
+ cmpwi cr3,r13,2
+
GET_PACA(r13)
+ lbz r0,PACA_THREAD_IDLE_STATE(r13)
+ cmpwi cr2,r0,PNV_THREAD_NAP
+ bgt cr2,8f /* Either sleep or Winkle */
+
+ /* Waking up from nap should not cause hypervisor state loss */
+ bgt cr3,.
+
+ /* Waking up from nap */
+ li r0,PNV_THREAD_RUNNING
+ stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
li r0,KVM_HWTHREAD_IN_KERNEL
/* Return SRR1 from power7_nap() */
mfspr r3,SPRN_SRR1
- beq cr1,2f
+ beq cr3,2f
b power7_wakeup_noloss
2: b power7_wakeup_loss
MACHINE_CHECK_HANDLER_WINDUP
GET_PACA(r13)
ld r1,PACAR1(r13)
+ li r3,PNV_THREAD_NAP
b power7_enter_nap_mode
4:
#endif
#include <asm/hw_irq.h>
#include <asm/kvm_book3s_asm.h>
#include <asm/opal.h>
+#include <asm/cpuidle.h>
#undef DEBUG
/*
* Pass requested state in r3:
- * 0 - nap
- * 1 - sleep
+ * r3 - PNV_THREAD_NAP/SLEEP/WINKLE
*
* To check IRQ_HAPPENED in r4
* 0 - don't check
li r4,KVM_HWTHREAD_IN_NAP
stb r4,HSTATE_HWTHREAD_STATE(r13)
#endif
- cmpwi cr0,r3,1
- beq 2f
+ stb r3,PACA_THREAD_IDLE_STATE(r13)
+ cmpwi cr1,r3,PNV_THREAD_SLEEP
+ bge cr1,2f
IDLE_STATE_ENTER_SEQ(PPC_NAP)
/* No return */
-2: IDLE_STATE_ENTER_SEQ(PPC_SLEEP)
- /* No return */
+2:
+ /* Sleep or winkle */
+ lbz r7,PACA_THREAD_MASK(r13)
+ ld r14,PACA_CORE_IDLE_STATE_PTR(r13)
+lwarx_loop1:
+ lwarx r15,0,r14
+ andc r15,r15,r7 /* Clear thread bit */
+
+ andi. r15,r15,PNV_CORE_IDLE_THREAD_BITS
+
+/*
+ * If cr0 = 0, then current thread is the last thread of the core entering
+ * sleep. Last thread needs to execute the hardware bug workaround code if
+ * required by the platform.
+ * Make the workaround call unconditionally here. The below branch call is
+ * patched out when the idle states are discovered if the platform does not
+ * require it.
+ */
+.global pnv_fastsleep_workaround_at_entry
+pnv_fastsleep_workaround_at_entry:
+ beq fastsleep_workaround_at_entry
+
+ stwcx. r15,0,r14
+ bne- lwarx_loop1
+ isync
+
+common_enter: /* common code for all the threads entering sleep */
+ IDLE_STATE_ENTER_SEQ(PPC_SLEEP)
+
+fastsleep_workaround_at_entry:
+ ori r15,r15,PNV_CORE_IDLE_LOCK_BIT
+ stwcx. r15,0,r14
+ bne- lwarx_loop1
+ isync
+
+ /* Fast sleep workaround */
+ li r3,1
+ li r4,1
+ li r0,OPAL_CONFIG_CPU_IDLE_STATE
+ bl opal_call_realmode
+
+ /* Clear Lock bit */
+ li r0,0
+ lwsync
+ stw r0,0(r14)
+ b common_enter
+
_GLOBAL(power7_idle)
/* Now check if user or arch enabled NAP mode */
_GLOBAL(power7_nap)
mr r4,r3
- li r3,0
+ li r3,PNV_THREAD_NAP
b power7_powersave_common
/* No return */
_GLOBAL(power7_sleep)
- li r3,1
+ li r3,PNV_THREAD_SLEEP
li r4,1
b power7_powersave_common
/* No return */
-/*
- * Make opal call in realmode. This is a generic function to be called
- * from realmode from reset vector. It handles endianess.
- *
- * r13 - paca pointer
- * r1 - stack pointer
- * r3 - opal token
- */
-opal_call_realmode:
- mflr r12
- std r12,_LINK(r1)
- ld r2,PACATOC(r13)
- /* Set opal return address */
- LOAD_REG_ADDR(r0,return_from_opal_call)
- mtlr r0
- /* Handle endian-ness */
- li r0,MSR_LE
- mfmsr r12
- andc r12,r12,r0
- mtspr SPRN_HSRR1,r12
- mr r0,r3 /* Move opal token to r0 */
- LOAD_REG_ADDR(r11,opal)
- ld r12,8(r11)
- ld r2,0(r11)
- mtspr SPRN_HSRR0,r12
- hrfid
-
-return_from_opal_call:
- FIXUP_ENDIAN
- ld r0,_LINK(r1)
- mtlr r0
- blr
-
#define CHECK_HMI_INTERRUPT \
mfspr r0,SPRN_SRR1; \
BEGIN_FTR_SECTION_NESTED(66); \
ld r2,PACATOC(r13); \
ld r1,PACAR1(r13); \
std r3,ORIG_GPR3(r1); /* Save original r3 */ \
- li r3,OPAL_HANDLE_HMI; /* Pass opal token argument*/ \
+ li r0,OPAL_HANDLE_HMI; /* Pass opal token argument*/ \
bl opal_call_realmode; \
ld r3,ORIG_GPR3(r1); /* Restore original r3 */ \
20: nop;
_GLOBAL(power7_wakeup_tb_loss)
ld r2,PACATOC(r13);
ld r1,PACAR1(r13)
+ /*
+ * Before entering any idle state, the NVGPRs are saved in the stack
+ * and they are restored before switching to the process context. Hence
+ * until they are restored, they are free to be used.
+ *
+ * Save SRR1 in a NVGPR as it might be clobbered in opal_call_realmode
+ * (called in CHECK_HMI_INTERRUPT). SRR1 is required to determine the
+ * wakeup reason if we branch to kvm_start_guest.
+ */
+ mfspr r16,SPRN_SRR1
BEGIN_FTR_SECTION
CHECK_HMI_INTERRUPT
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
+
+ lbz r7,PACA_THREAD_MASK(r13)
+ ld r14,PACA_CORE_IDLE_STATE_PTR(r13)
+lwarx_loop2:
+ lwarx r15,0,r14
+ andi. r9,r15,PNV_CORE_IDLE_LOCK_BIT
+ /*
+ * Lock bit is set in one of the 2 cases-
+ * a. In the sleep/winkle enter path, the last thread is executing
+ * fastsleep workaround code.
+ * b. In the wake up path, another thread is executing fastsleep
+ * workaround undo code or resyncing timebase or restoring context
+ * In either case loop until the lock bit is cleared.
+ */
+ bne core_idle_lock_held
+
+ cmpwi cr2,r15,0
+ or r15,r15,r7 /* Set thread bit */
+
+ beq cr2,first_thread
+
+ /* Not first thread in core to wake up */
+ stwcx. r15,0,r14
+ bne- lwarx_loop2
+ isync
+ b common_exit
+
+core_idle_lock_held:
+ HMT_LOW
+core_idle_lock_loop:
+ lwz r15,0(14)
+ andi. r9,r15,PNV_CORE_IDLE_LOCK_BIT
+ bne core_idle_lock_loop
+ HMT_MEDIUM
+ b lwarx_loop2
+
+first_thread:
+ /* First thread in core to wakeup */
+ ori r15,r15,PNV_CORE_IDLE_LOCK_BIT
+ stwcx. r15,0,r14
+ bne- lwarx_loop2
+ isync
+
+ /*
+ * First thread in the core waking up from fastsleep. It needs to
+ * call the fastsleep workaround code if the platform requires it.
+ * Call it unconditionally here. The below branch instruction will
+ * be patched out when the idle states are discovered if platform
+ * does not require workaround.
+ */
+.global pnv_fastsleep_workaround_at_exit
+pnv_fastsleep_workaround_at_exit:
+ b fastsleep_workaround_at_exit
+
+timebase_resync:
+ /* Do timebase resync if we are waking up from sleep. Use cr3 value
+ * set in exceptions-64s.S */
+ ble cr3,clear_lock
/* Time base re-sync */
- li r3,OPAL_RESYNC_TIMEBASE
+ li r0,OPAL_RESYNC_TIMEBASE
bl opal_call_realmode;
-
/* TODO: Check r3 for failure */
+clear_lock:
+ andi. r15,r15,PNV_CORE_IDLE_THREAD_BITS
+ lwsync
+ stw r15,0(r14)
+
+common_exit:
+ li r5,PNV_THREAD_RUNNING
+ stb r5,PACA_THREAD_IDLE_STATE(r13)
+
+ mtspr SPRN_SRR1,r16
+#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
+ li r0,KVM_HWTHREAD_IN_KERNEL
+ stb r0,HSTATE_HWTHREAD_STATE(r13)
+ /* Order setting hwthread_state vs. testing hwthread_req */
+ sync
+ lbz r0,HSTATE_HWTHREAD_REQ(r13)
+ cmpwi r0,0
+ beq 6f
+ b kvm_start_guest
+6:
+#endif
+
REST_NVGPRS(r1)
REST_GPR(2, r1)
ld r3,_CCR(r1)
mtspr SPRN_SRR0,r5
rfid
+fastsleep_workaround_at_exit:
+ li r3,1
+ li r4,0
+ li r0,OPAL_CONFIG_CPU_IDLE_STATE
+ bl opal_call_realmode
+ b timebase_resync
+
/*
* R3 here contains the value that will be returned to the caller
* of power7_nap.
blr
#endif
+/*
+ * Make opal call in realmode. This is a generic function to be called
+ * from realmode. It handles endianness.
+ *
+ * r13 - paca pointer
+ * r1 - stack pointer
+ * r0 - opal token
+ */
+_GLOBAL(opal_call_realmode)
+ mflr r12
+ std r12,PPC_LR_STKOFF(r1)
+ ld r2,PACATOC(r13)
+ /* Set opal return address */
+ LOAD_REG_ADDR(r12,return_from_opal_call)
+ mtlr r12
+
+ mfmsr r12
+#ifdef __LITTLE_ENDIAN__
+ /* Handle endian-ness */
+ li r11,MSR_LE
+ andc r12,r12,r11
+#endif
+ mtspr SPRN_HSRR1,r12
+ LOAD_REG_ADDR(r11,opal)
+ ld r12,8(r11)
+ ld r2,0(r11)
+ mtspr SPRN_HSRR0,r12
+ hrfid
+
+return_from_opal_call:
+#ifdef __LITTLE_ENDIAN__
+ FIXUP_ENDIAN
+#endif
+ ld r12,PPC_LR_STKOFF(r1)
+ mtlr r12
+ blr
+
OPAL_CALL(opal_invalid_call, OPAL_INVALID_CALL);
OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
#include <asm/opal.h>
#include <asm/kexec.h>
#include <asm/smp.h>
+#include <asm/cputhreads.h>
+#include <asm/cpuidle.h>
+#include <asm/code-patching.h>
#include "powernv.h"
static u32 supported_cpuidle_states;
+static void pnv_alloc_idle_core_states(void)
+{
+ int i, j;
+ int nr_cores = cpu_nr_cores();
+ u32 *core_idle_state;
+
+ /*
+ * core_idle_state - First 8 bits track the idle state of each thread
+ * of the core. The 8th bit is the lock bit. Initially all thread bits
+ * are set. They are cleared when the thread enters deep idle state
+ * like sleep and winkle. Initially the lock bit is cleared.
+ * The lock bit has 2 purposes
+ * a. While the first thread is restoring core state, it prevents
+ * other threads in the core from switching to process context.
+ * b. While the last thread in the core is saving the core state, it
+ * prevents a different thread from waking up.
+ */
+ for (i = 0; i < nr_cores; i++) {
+ int first_cpu = i * threads_per_core;
+ int node = cpu_to_node(first_cpu);
+
+ core_idle_state = kmalloc_node(sizeof(u32), GFP_KERNEL, node);
+ *core_idle_state = PNV_CORE_IDLE_THREAD_BITS;
+
+ for (j = 0; j < threads_per_core; j++) {
+ int cpu = first_cpu + j;
+
+ paca[cpu].core_idle_state_ptr = core_idle_state;
+ paca[cpu].thread_idle_state = PNV_THREAD_RUNNING;
+ paca[cpu].thread_mask = 1 << j;
+ }
+ }
+}
+
u32 pnv_get_supported_cpuidle_states(void)
{
return supported_cpuidle_states;
}
+EXPORT_SYMBOL_GPL(pnv_get_supported_cpuidle_states);
static int __init pnv_init_idle_states(void)
{
flags = be32_to_cpu(idle_state_flags[i]);
supported_cpuidle_states |= flags;
}
-
+ if (!(supported_cpuidle_states & OPAL_PM_SLEEP_ENABLED_ER1)) {
+ patch_instruction(
+ (unsigned int *)pnv_fastsleep_workaround_at_entry,
+ PPC_INST_NOP);
+ patch_instruction(
+ (unsigned int *)pnv_fastsleep_workaround_at_exit,
+ PPC_INST_NOP);
+ }
+ pnv_alloc_idle_core_states();
return 0;
}
subsys_initcall(pnv_init_idle_states);
-
static int __init pnv_probe(void)
{
unsigned long root = of_get_flat_dt_root();
mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~(u64)LPCR_PECE1);
while (!generic_check_cpu_restart(cpu)) {
ppc64_runlatch_off();
- if (idle_states & OPAL_PM_SLEEP_ENABLED)
+ if ((idle_states & OPAL_PM_SLEEP_ENABLED) ||
+ (idle_states & OPAL_PM_SLEEP_ENABLED_ER1))
srr1 = power7_sleep();
else
srr1 = power7_nap(1);
nr_idle_states++;
}
- if (flags & OPAL_PM_SLEEP_ENABLED) {
+ if (flags & OPAL_PM_SLEEP_ENABLED ||
+ flags & OPAL_PM_SLEEP_ENABLED_ER1) {
/* Add FASTSLEEP state */
strcpy(powernv_states[nr_idle_states].name, "FastSleep");
strcpy(powernv_states[nr_idle_states].desc, "FastSleep");
projects / cascardo / linux.git / commitdiff