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powerpc/64s: Reimplement book3s idle code in C
Reimplement Book3S idle code in C, moving POWER7/8/9 implementation speific HV idle code to the powernv platform code. Book3S assembly stubs are kept in common code and used only to save the stack frame and non-volatile GPRs before executing architected idle instructions, and restoring the stack and reloading GPRs then returning to C after waking from idle. The complex logic dealing with threads and subcores, locking, SPRs, HMIs, timebase resync, etc., is all done in C which makes it more maintainable. This is not a strict translation to C code, there are some significant differences: - Idle wakeup no longer uses the ->cpu_restore call to reinit SPRs, but saves and restores them itself. - The optimisation where EC=ESL=0 idle modes did not have to save GPRs or change MSR is restored, because it's now simple to do. ESL=1 sleeps that do not lose GPRs can use this optimization too. - KVM secondary entry and cede is now more of a call/return style rather than branchy. nap_state_lost is not required because KVM always returns via NVGPR restoring path. - KVM secondary wakeup from offline sequence is moved entirely into the offline wakeup, which avoids a hwsync in the normal idle wakeup path. Performance measured with context switch ping-pong on different threads or cores, is possibly improved a small amount, 1-3% depending on stop state and core vs thread test for shallow states. Deep states it's in the noise compared with other latencies. KVM improvements: - Idle sleepers now always return to caller rather than branch out to KVM first. - This allows optimisations like very fast return to caller when no state has been lost. - KVM no longer requires nap_state_lost because it controls NVGPR save/restore itself on the way in and out. - The heavy idle wakeup KVM request check can be moved out of the normal host idle code and into the not-performance-critical offline code. - KVM nap code now returns from where it is called, which makes the flow a bit easier to follow. Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Squash the KVM changes in] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
Michael Ellerman
parent
c1fe190c06
commit
10d91611f4
@ -27,10 +27,11 @@
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* the THREAD_WINKLE_BITS are set, which indicate which threads have not
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* yet woken from the winkle state.
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*/
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#define PNV_CORE_IDLE_LOCK_BIT 0x10000000
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#define NR_PNV_CORE_IDLE_LOCK_BIT 28
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#define PNV_CORE_IDLE_LOCK_BIT (1ULL << NR_PNV_CORE_IDLE_LOCK_BIT)
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#define PNV_CORE_IDLE_WINKLE_COUNT_SHIFT 16
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#define PNV_CORE_IDLE_WINKLE_COUNT 0x00010000
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#define PNV_CORE_IDLE_WINKLE_COUNT_ALL_BIT 0x00080000
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#define PNV_CORE_IDLE_WINKLE_COUNT_BITS 0x000F0000
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#define PNV_CORE_IDLE_THREAD_WINKLE_BITS_SHIFT 8
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#define PNV_CORE_IDLE_THREAD_WINKLE_BITS 0x0000FF00
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@ -68,16 +69,6 @@
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#define ERR_DEEP_STATE_ESL_MISMATCH -2
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#ifndef __ASSEMBLY__
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/* Additional SPRs that need to be saved/restored during stop */
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struct stop_sprs {
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u64 pid;
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u64 ldbar;
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u64 fscr;
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u64 hfscr;
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u64 mmcr1;
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u64 mmcr2;
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u64 mmcra;
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};
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#define PNV_IDLE_NAME_LEN 16
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struct pnv_idle_states_t {
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@ -92,10 +83,6 @@ struct pnv_idle_states_t {
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extern struct pnv_idle_states_t *pnv_idle_states;
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extern int nr_pnv_idle_states;
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extern u32 pnv_fastsleep_workaround_at_entry[];
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extern u32 pnv_fastsleep_workaround_at_exit[];
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extern u64 pnv_first_deep_stop_state;
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unsigned long pnv_cpu_offline(unsigned int cpu);
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int validate_psscr_val_mask(u64 *psscr_val, u64 *psscr_mask, u32 flags);
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@ -173,7 +173,6 @@ struct paca_struct {
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u8 irq_happened; /* irq happened while soft-disabled */
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u8 io_sync; /* writel() needs spin_unlock sync */
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u8 irq_work_pending; /* IRQ_WORK interrupt while soft-disable */
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u8 nap_state_lost; /* NV GPR values lost in power7_idle */
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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u8 pmcregs_in_use; /* pseries puts this in lppaca */
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#endif
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@ -183,23 +182,28 @@ struct paca_struct {
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#endif
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#ifdef CONFIG_PPC_POWERNV
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/* Per-core mask tracking idle threads and a lock bit-[L][TTTTTTTT] */
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u32 *core_idle_state_ptr;
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u8 thread_idle_state; /* PNV_THREAD_RUNNING/NAP/SLEEP */
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/* Mask to indicate thread id in core */
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u8 thread_mask;
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/* PowerNV idle fields */
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/* PNV_CORE_IDLE_* bits, all siblings work on thread 0 paca */
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unsigned long idle_state;
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union {
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/* P7/P8 specific fields */
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struct {
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/* PNV_THREAD_RUNNING/NAP/SLEEP */
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u8 thread_idle_state;
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/* Mask to denote subcore sibling threads */
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u8 subcore_sibling_mask;
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/* Flag to request this thread not to stop */
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atomic_t dont_stop;
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};
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/* P9 specific fields */
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struct {
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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/* The PSSCR value that the kernel requested before going to stop */
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u64 requested_psscr;
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/*
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* Save area for additional SPRs that need to be
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* saved/restored during cpuidle stop.
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*/
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struct stop_sprs stop_sprs;
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/* Flag to request this thread not to stop */
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atomic_t dont_stop;
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#endif
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};
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};
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#endif
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#ifdef CONFIG_PPC_BOOK3S_64
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@ -411,14 +411,17 @@ static inline unsigned long get_clean_sp(unsigned long sp, int is_32)
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}
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#endif
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/* asm stubs */
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extern unsigned long isa300_idle_stop_noloss(unsigned long psscr_val);
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extern unsigned long isa300_idle_stop_mayloss(unsigned long psscr_val);
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extern unsigned long isa206_idle_insn_mayloss(unsigned long type);
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extern unsigned long cpuidle_disable;
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enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_POWERSAVE_OFF};
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extern int powersave_nap; /* set if nap mode can be used in idle loop */
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extern unsigned long power7_idle_insn(unsigned long type); /* PNV_THREAD_NAP/etc*/
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extern void power7_idle_type(unsigned long type);
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extern unsigned long power9_idle_stop(unsigned long psscr_val);
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extern unsigned long power9_offline_stop(unsigned long psscr_val);
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extern void power9_idle_type(unsigned long stop_psscr_val,
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unsigned long stop_psscr_mask);
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@ -168,6 +168,7 @@
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#define PSSCR_ESL 0x00200000 /* Enable State Loss */
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#define PSSCR_SD 0x00400000 /* Status Disable */
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#define PSSCR_PLS 0xf000000000000000 /* Power-saving Level Status */
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#define PSSCR_PLS_SHIFT 60
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#define PSSCR_GUEST_VIS 0xf0000000000003ffUL /* Guest-visible PSSCR fields */
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#define PSSCR_FAKE_SUSPEND 0x00000400 /* Fake-suspend bit (P9 DD2.2) */
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#define PSSCR_FAKE_SUSPEND_LG 10 /* Fake-suspend bit position */
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@ -758,10 +759,9 @@
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#define SRR1_WAKERESET 0x00100000 /* System reset */
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#define SRR1_WAKEHDBELL 0x000c0000 /* Hypervisor doorbell on P8 */
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#define SRR1_WAKESTATE 0x00030000 /* Powersave exit mask [46:47] */
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#define SRR1_WS_DEEPEST 0x00030000 /* Some resources not maintained,
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* may not be recoverable */
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#define SRR1_WS_DEEPER 0x00020000 /* Some resources not maintained */
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#define SRR1_WS_DEEP 0x00010000 /* All resources maintained */
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#define SRR1_WS_HVLOSS 0x00030000 /* HV resources not maintained */
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#define SRR1_WS_GPRLOSS 0x00020000 /* GPRs not maintained */
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#define SRR1_WS_NOLOSS 0x00010000 /* All resources maintained */
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#define SRR1_PROGTM 0x00200000 /* TM Bad Thing */
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#define SRR1_PROGFPE 0x00100000 /* Floating Point Enabled */
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#define SRR1_PROGILL 0x00080000 /* Illegal instruction */
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@ -268,7 +268,6 @@ int main(void)
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OFFSET(ACCOUNT_USER_TIME, paca_struct, accounting.utime);
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OFFSET(ACCOUNT_SYSTEM_TIME, paca_struct, accounting.stime);
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OFFSET(PACA_TRAP_SAVE, paca_struct, trap_save);
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OFFSET(PACA_NAPSTATELOST, paca_struct, nap_state_lost);
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OFFSET(PACA_SPRG_VDSO, paca_struct, sprg_vdso);
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#else /* CONFIG_PPC64 */
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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@ -766,23 +765,6 @@ int main(void)
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OFFSET(VCPU_TIMING_LAST_ENTER_TBL, kvm_vcpu, arch.timing_last_enter.tv32.tbl);
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#endif
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#ifdef CONFIG_PPC_POWERNV
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OFFSET(PACA_CORE_IDLE_STATE_PTR, paca_struct, core_idle_state_ptr);
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OFFSET(PACA_THREAD_IDLE_STATE, paca_struct, thread_idle_state);
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OFFSET(PACA_THREAD_MASK, paca_struct, thread_mask);
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OFFSET(PACA_SUBCORE_SIBLING_MASK, paca_struct, subcore_sibling_mask);
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OFFSET(PACA_REQ_PSSCR, paca_struct, requested_psscr);
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OFFSET(PACA_DONT_STOP, paca_struct, dont_stop);
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#define STOP_SPR(x, f) OFFSET(x, paca_struct, stop_sprs.f)
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STOP_SPR(STOP_PID, pid);
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STOP_SPR(STOP_LDBAR, ldbar);
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STOP_SPR(STOP_FSCR, fscr);
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STOP_SPR(STOP_HFSCR, hfscr);
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STOP_SPR(STOP_MMCR1, mmcr1);
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STOP_SPR(STOP_MMCR2, mmcr2);
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STOP_SPR(STOP_MMCRA, mmcra);
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#endif
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DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER);
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DEFINE(PPC_DBELL_MSGTYPE, PPC_DBELL_MSGTYPE);
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@ -120,7 +120,9 @@ EXC_VIRT_NONE(0x4000, 0x100)
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mfspr r10,SPRN_SRR1 ; \
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rlwinm. r10,r10,47-31,30,31 ; \
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beq- 1f ; \
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cmpwi cr3,r10,2 ; \
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cmpwi cr1,r10,2 ; \
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mfspr r3,SPRN_SRR1 ; \
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bltlr cr1 ; /* no state loss, return to idle caller */ \
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BRANCH_TO_C000(r10, system_reset_idle_common) ; \
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1: \
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KVMTEST_PR(n) ; \
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@ -144,8 +146,11 @@ TRAMP_KVM(PACA_EXNMI, 0x100)
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#ifdef CONFIG_PPC_P7_NAP
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EXC_COMMON_BEGIN(system_reset_idle_common)
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mfspr r12,SPRN_SRR1
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b pnv_powersave_wakeup
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/*
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* This must be a direct branch (without linker branch stub) because
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* we can not use TOC at this point as r2 may not be restored yet.
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*/
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b idle_return_gpr_loss
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#endif
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/*
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@ -427,17 +432,17 @@ EXC_COMMON_BEGIN(machine_check_idle_common)
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* Then decrement MCE nesting after finishing with the stack.
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*/
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ld r3,_MSR(r1)
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ld r4,_LINK(r1)
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lhz r11,PACA_IN_MCE(r13)
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subi r11,r11,1
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sth r11,PACA_IN_MCE(r13)
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/* Turn off the RI bit because SRR1 is used by idle wakeup code. */
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/* Recoverability could be improved by reducing the use of SRR1. */
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li r11,0
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mtmsrd r11,1
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b pnv_powersave_wakeup_mce
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mtlr r4
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rlwinm r10,r3,47-31,30,31
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cmpwi cr1,r10,2
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bltlr cr1 /* no state loss, return to idle caller */
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b idle_return_gpr_loss
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#endif
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/*
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* Handle machine check early in real mode. We come here with
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File diff suppressed because it is too large
Load Diff
@ -401,8 +401,8 @@ void __init check_for_initrd(void)
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#ifdef CONFIG_SMP
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int threads_per_core, threads_per_subcore, threads_shift;
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cpumask_t threads_core_mask;
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int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
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cpumask_t threads_core_mask __read_mostly;
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EXPORT_SYMBOL_GPL(threads_per_core);
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EXPORT_SYMBOL_GPL(threads_per_subcore);
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EXPORT_SYMBOL_GPL(threads_shift);
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@ -35,6 +35,7 @@
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#include <asm/thread_info.h>
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#include <asm/asm-compat.h>
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#include <asm/feature-fixups.h>
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#include <asm/cpuidle.h>
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/* Sign-extend HDEC if not on POWER9 */
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#define EXTEND_HDEC(reg) \
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@ -45,6 +46,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
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/* Values in HSTATE_NAPPING(r13) */
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#define NAPPING_CEDE 1
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#define NAPPING_NOVCPU 2
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#define NAPPING_UNSPLIT 3
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/* Stack frame offsets for kvmppc_hv_entry */
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#define SFS 208
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@ -290,17 +292,19 @@ kvm_novcpu_exit:
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b kvmhv_switch_to_host
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/*
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* We come in here when wakened from nap mode.
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* Relocation is off and most register values are lost.
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* r13 points to the PACA.
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* We come in here when wakened from Linux offline idle code.
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* Relocation is off
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* r3 contains the SRR1 wakeup value, SRR1 is trashed.
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*/
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.globl kvm_start_guest
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kvm_start_guest:
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/* Set runlatch bit the minute you wake up from nap */
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mfspr r0, SPRN_CTRLF
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ori r0, r0, 1
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mtspr SPRN_CTRLT, r0
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_GLOBAL(idle_kvm_start_guest)
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ld r4,PACAEMERGSP(r13)
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mfcr r5
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mflr r0
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std r1,0(r4)
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std r5,8(r4)
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std r0,16(r4)
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subi r1,r4,STACK_FRAME_OVERHEAD
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SAVE_NVGPRS(r1)
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/*
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* Could avoid this and pass it through in r3. For now,
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@ -308,27 +312,23 @@ kvm_start_guest:
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*/
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mtspr SPRN_SRR1,r3
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ld r2,PACATOC(r13)
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li r0,0
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stb r0,PACA_FTRACE_ENABLED(r13)
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li r0,KVM_HWTHREAD_IN_KVM
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stb r0,HSTATE_HWTHREAD_STATE(r13)
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/* NV GPR values from power7_idle() will no longer be valid */
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li r0,1
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stb r0,PACA_NAPSTATELOST(r13)
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/* were we napping due to cede? */
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/* kvm cede / napping does not come through here */
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lbz r0,HSTATE_NAPPING(r13)
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cmpwi r0,NAPPING_CEDE
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beq kvm_end_cede
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cmpwi r0,NAPPING_NOVCPU
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beq kvm_novcpu_wakeup
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twnei r0,0
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ld r1,PACAEMERGSP(r13)
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subi r1,r1,STACK_FRAME_OVERHEAD
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b 1f
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kvm_unsplit_wakeup:
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li r0, 0
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stb r0, HSTATE_NAPPING(r13)
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1:
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/*
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* We weren't napping due to cede, so this must be a secondary
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@ -437,19 +437,25 @@ kvm_no_guest:
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lbz r3, HSTATE_HWTHREAD_REQ(r13)
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cmpwi r3, 0
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bne 54f
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/*
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* We jump to pnv_wakeup_loss, which will return to the caller
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* of power7_nap in the powernv cpu offline loop. The value we
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* put in r3 becomes the return value for power7_nap. pnv_wakeup_loss
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* requires SRR1 in r12.
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* Jump to idle_return_gpr_loss, which returns to the
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* idle_kvm_start_guest caller.
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*/
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li r3, LPCR_PECE0
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mfspr r4, SPRN_LPCR
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rlwimi r4, r3, 0, LPCR_PECE0 | LPCR_PECE1
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mtspr SPRN_LPCR, r4
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li r3, 0
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mfspr r12,SPRN_SRR1
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b pnv_wakeup_loss
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/* set up r3 for return */
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mfspr r3,SPRN_SRR1
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REST_NVGPRS(r1)
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addi r1, r1, STACK_FRAME_OVERHEAD
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ld r0, 16(r1)
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ld r5, 8(r1)
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ld r1, 0(r1)
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mtlr r0
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mtcr r5
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blr
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53: HMT_LOW
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ld r5, HSTATE_KVM_VCORE(r13)
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@ -534,6 +540,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_207S)
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lbz r0, KVM_SPLIT_DO_NAP(r3)
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cmpwi r0, 0
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beq 57f
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li r3, NAPPING_UNSPLIT
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stb r3, HSTATE_NAPPING(r13)
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li r3, (LPCR_PECEDH | LPCR_PECE0) >> 4
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mfspr r5, SPRN_LPCR
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rlwimi r5, r3, 4, (LPCR_PECEDP | LPCR_PECEDH | LPCR_PECE0 | LPCR_PECE1)
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@ -2657,6 +2665,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
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lis r3, LPCR_PECEDP@h /* Do wake on privileged doorbell */
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/* Go back to host stack */
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ld r1, HSTATE_HOST_R1(r13)
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/*
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* Take a nap until a decrementer or external or doobell interrupt
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* occurs, with PECE1 and PECE0 set in LPCR.
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@ -2685,26 +2696,42 @@ BEGIN_FTR_SECTION
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* requested level = 0 (just stop dispatching)
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*/
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lis r3, (PSSCR_EC | PSSCR_ESL)@h
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mtspr SPRN_PSSCR, r3
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/* Set LPCR_PECE_HVEE bit to enable wakeup by HV interrupts */
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li r4, LPCR_PECE_HVEE@higher
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sldi r4, r4, 32
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or r5, r5, r4
|
||||
END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
|
||||
FTR_SECTION_ELSE
|
||||
li r3, PNV_THREAD_NAP
|
||||
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
|
||||
mtspr SPRN_LPCR,r5
|
||||
isync
|
||||
li r0, 0
|
||||
std r0, HSTATE_SCRATCH0(r13)
|
||||
ptesync
|
||||
ld r0, HSTATE_SCRATCH0(r13)
|
||||
1: cmpd r0, r0
|
||||
bne 1b
|
||||
|
||||
BEGIN_FTR_SECTION
|
||||
nap
|
||||
bl isa300_idle_stop_mayloss
|
||||
FTR_SECTION_ELSE
|
||||
PPC_STOP
|
||||
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300)
|
||||
b .
|
||||
bl isa206_idle_insn_mayloss
|
||||
ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
|
||||
|
||||
mfspr r0, SPRN_CTRLF
|
||||
ori r0, r0, 1
|
||||
mtspr SPRN_CTRLT, r0
|
||||
|
||||
mtspr SPRN_SRR1, r3
|
||||
|
||||
li r0, 0
|
||||
stb r0, PACA_FTRACE_ENABLED(r13)
|
||||
|
||||
li r0, KVM_HWTHREAD_IN_KVM
|
||||
stb r0, HSTATE_HWTHREAD_STATE(r13)
|
||||
|
||||
lbz r0, HSTATE_NAPPING(r13)
|
||||
cmpwi r0, NAPPING_CEDE
|
||||
beq kvm_end_cede
|
||||
cmpwi r0, NAPPING_NOVCPU
|
||||
beq kvm_novcpu_wakeup
|
||||
cmpwi r0, NAPPING_UNSPLIT
|
||||
beq kvm_unsplit_wakeup
|
||||
twi 31,0,0 /* Nap state must not be zero */
|
||||
|
||||
33: mr r4, r3
|
||||
li r3, 0
|
||||
@ -2712,12 +2739,11 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_300)
|
||||
b 34f
|
||||
|
||||
kvm_end_cede:
|
||||
/* Woken by external or decrementer interrupt */
|
||||
|
||||
/* get vcpu pointer */
|
||||
ld r4, HSTATE_KVM_VCPU(r13)
|
||||
|
||||
/* Woken by external or decrementer interrupt */
|
||||
ld r1, HSTATE_HOST_R1(r13)
|
||||
|
||||
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
|
||||
addi r3, r4, VCPU_TB_RMINTR
|
||||
bl kvmhv_accumulate_time
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
@ -183,7 +183,7 @@ static void unsplit_core(void)
|
||||
cpu = smp_processor_id();
|
||||
if (cpu_thread_in_core(cpu) != 0) {
|
||||
while (mfspr(SPRN_HID0) & mask)
|
||||
power7_idle_insn(PNV_THREAD_NAP);
|
||||
power7_idle_type(PNV_THREAD_NAP);
|
||||
|
||||
per_cpu(split_state, cpu).step = SYNC_STEP_UNSPLIT;
|
||||
return;
|
||||
|
||||
@ -2431,7 +2431,6 @@ static void dump_one_paca(int cpu)
|
||||
DUMP(p, irq_happened, "%#-*x");
|
||||
DUMP(p, io_sync, "%#-*x");
|
||||
DUMP(p, irq_work_pending, "%#-*x");
|
||||
DUMP(p, nap_state_lost, "%#-*x");
|
||||
DUMP(p, sprg_vdso, "%#-*llx");
|
||||
|
||||
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
||||
@ -2439,20 +2438,17 @@ static void dump_one_paca(int cpu)
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_PPC_POWERNV
|
||||
DUMP(p, core_idle_state_ptr, "%-*px");
|
||||
DUMP(p, idle_state, "%#-*lx");
|
||||
if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) {
|
||||
DUMP(p, thread_idle_state, "%#-*x");
|
||||
DUMP(p, thread_mask, "%#-*x");
|
||||
DUMP(p, subcore_sibling_mask, "%#-*x");
|
||||
} else {
|
||||
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
|
||||
DUMP(p, requested_psscr, "%#-*llx");
|
||||
DUMP(p, stop_sprs.pid, "%#-*llx");
|
||||
DUMP(p, stop_sprs.ldbar, "%#-*llx");
|
||||
DUMP(p, stop_sprs.fscr, "%#-*llx");
|
||||
DUMP(p, stop_sprs.hfscr, "%#-*llx");
|
||||
DUMP(p, stop_sprs.mmcr1, "%#-*llx");
|
||||
DUMP(p, stop_sprs.mmcr2, "%#-*llx");
|
||||
DUMP(p, stop_sprs.mmcra, "%#-*llx");
|
||||
DUMP(p, dont_stop.counter, "%#-*x");
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
|
||||
DUMP(p, accounting.utime, "%#-*lx");
|
||||
DUMP(p, accounting.stime, "%#-*lx");
|
||||
|
||||
Loading…
Reference in New Issue
Block a user