@@ -68,16 +68,6 @@
#define ERR_DEEP_STATE_ESL_MISMATCH -2
#ifndef __ASSEMBLY__
-/* Additional SPRs that need to be saved/restored during stop */
-struct stop_sprs {
- u64 pid;
- u64 ldbar;
- u64 fscr;
- u64 hfscr;
- u64 mmcr1;
- u64 mmcr2;
- u64 mmcra;
-};
extern u32 pnv_fastsleep_workaround_at_entry[];
extern u32 pnv_fastsleep_workaround_at_exit[];
@@ -208,7 +208,9 @@
#define OPAL_SENSOR_READ_U64 162
#define OPAL_PCI_GET_PBCQ_TUNNEL_BAR 164
#define OPAL_PCI_SET_PBCQ_TUNNEL_BAR 165
-#define OPAL_LAST 165
+#define OPAL_IDLE_SAVE 168
+#define OPAL_IDLE_RESTORE 169
+#define OPAL_LAST 169
#define QUIESCE_HOLD 1 /* Spin all calls at entry */
#define QUIESCE_REJECT 2 /* Fail all calls with OPAL_BUSY */
@@ -356,6 +356,9 @@ extern void opal_kmsg_init(void);
extern int opal_event_request(unsigned int opal_event_nr);
+extern int opal_cpuidle_save(u64 *stop_sprs, int scope, u64 psscr);
+extern int opal_cpuidle_restore(u64 *stop_sprs, int scope, u64 psscr, u64 srr1);
+
struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,
unsigned long vmalloc_size);
void opal_free_sg_list(struct opal_sg_list *sg);
@@ -195,11 +195,12 @@ struct paca_struct {
/* The PSSCR value that the kernel requested before going to stop */
u64 requested_psscr;
+ u64 wakeup_psscr;
/*
- * Save area for additional SPRs that need to be
+ * Save area for SPRs that need to be
* saved/restored during cpuidle stop.
*/
- struct stop_sprs stop_sprs;
+ u64 *opal_stop_sprs;
#endif
#ifdef CONFIG_PPC_BOOK3S_64
@@ -769,14 +769,8 @@ int main(void)
OFFSET(PACA_SIBLING_PACA_PTRS, paca_struct, thread_sibling_pacas);
OFFSET(PACA_REQ_PSSCR, paca_struct, requested_psscr);
OFFSET(PACA_DONT_STOP, paca_struct, dont_stop);
-#define STOP_SPR(x, f) OFFSET(x, paca_struct, stop_sprs.f)
- STOP_SPR(STOP_PID, pid);
- STOP_SPR(STOP_LDBAR, ldbar);
- STOP_SPR(STOP_FSCR, fscr);
- STOP_SPR(STOP_HFSCR, hfscr);
- STOP_SPR(STOP_MMCR1, mmcr1);
- STOP_SPR(STOP_MMCR2, mmcr2);
- STOP_SPR(STOP_MMCRA, mmcra);
+ OFFSET(PACA_WAKEUP_PSSCR, paca_struct, wakeup_psscr);
+ OFFSET(STOP_SPRS, paca_struct, opal_stop_sprs);
#endif
DEFINE(PPC_DBELL_SERVER, PPC_DBELL_SERVER);
@@ -45,6 +45,9 @@
#define PSSCR_EC_ESL_MASK_SHIFTED (PSSCR_EC | PSSCR_ESL) >> 16
+#define SCOPE_CORE 0
+#define SCOPE_THREAD 1
+
.text
/*
@@ -56,19 +59,8 @@ save_sprs_to_stack:
* Note all register i.e per-core, per-subcore or per-thread is saved
* here since any thread in the core might wake up first
*/
-BEGIN_FTR_SECTION
- /*
- * Note - SDR1 is dropped in Power ISA v3. Hence not restoring
- * SDR1 here
- */
- mfspr r3,SPRN_PTCR
- std r3,_PTCR(r1)
- mfspr r3,SPRN_LPCR
- std r3,_LPCR(r1)
-FTR_SECTION_ELSE
mfspr r3,SPRN_SDR1
std r3,_SDR1(r1)
-ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
mfspr r3,SPRN_RPR
std r3,_RPR(r1)
mfspr r3,SPRN_SPURR
@@ -85,66 +77,6 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
std r3,_WORT(r1)
mfspr r3,SPRN_WORC
std r3,_WORC(r1)
-/*
- * On POWER9, there are idle states such as stop4, invoked via cpuidle,
- * that lose hypervisor resources. In such cases, we need to save
- * additional SPRs before entering those idle states so that they can
- * be restored to their older values on wakeup from the idle state.
- *
- * On POWER8, the only such deep idle state is winkle which is used
- * only in the context of CPU-Hotplug, where these additional SPRs are
- * reinitiazed to a sane value. Hence there is no need to save/restore
- * these SPRs.
- */
-BEGIN_FTR_SECTION
- blr
-END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_300)
-
-power9_save_additional_sprs:
- mfspr r3, SPRN_PID
- mfspr r4, SPRN_LDBAR
- std r3, STOP_PID(r13)
- std r4, STOP_LDBAR(r13)
-
- mfspr r3, SPRN_FSCR
- mfspr r4, SPRN_HFSCR
- std r3, STOP_FSCR(r13)
- std r4, STOP_HFSCR(r13)
-
- mfspr r3, SPRN_MMCRA
- mfspr r4, SPRN_MMCR0
- std r3, STOP_MMCRA(r13)
- std r4, _MMCR0(r1)
-
- mfspr r3, SPRN_MMCR1
- mfspr r4, SPRN_MMCR2
- std r3, STOP_MMCR1(r13)
- std r4, STOP_MMCR2(r13)
- blr
-
-power9_restore_additional_sprs:
- ld r3,_LPCR(r1)
- ld r4, STOP_PID(r13)
- mtspr SPRN_LPCR,r3
- mtspr SPRN_PID, r4
-
- ld r3, STOP_LDBAR(r13)
- ld r4, STOP_FSCR(r13)
- mtspr SPRN_LDBAR, r3
- mtspr SPRN_FSCR, r4
-
- ld r3, STOP_HFSCR(r13)
- ld r4, STOP_MMCRA(r13)
- mtspr SPRN_HFSCR, r3
- mtspr SPRN_MMCRA, r4
-
- ld r3, _MMCR0(r1)
- ld r4, STOP_MMCR1(r13)
- mtspr SPRN_MMCR0, r3
- mtspr SPRN_MMCR1, r4
-
- ld r3, STOP_MMCR2(r13)
- mtspr SPRN_MMCR2, r3
blr
/*
@@ -388,7 +320,14 @@ lwarx_loop_stop:
bne- lwarx_loop_stop
isync
- bl save_sprs_to_stack
+BEGIN_FTR_SECTION
+ ld r3,STOP_SPRS(r13)
+ li r4,SCOPE_CORE
+ ld r5,PACA_REQ_PSSCR(r13)
+ bl opal_cpuidle_save
+FTR_SECTION_ELSE
+ bl save_sprs_to_stack
+ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
PPC_STOP /* Does not return (system reset interrupt) */
@@ -566,6 +505,8 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
#endif
/* Return SRR1 from power7_nap() */
+ rlwinm r11,r12,47-31,30,31
+ cmpwi cr3,r11,2
blt cr3,pnv_wakeup_noloss
b pnv_wakeup_loss
@@ -576,6 +517,8 @@ ALT_FTR_SECTION_END_IFSET(CPU_FTR_ARCH_300)
* cr3 - set to gt if waking up with partial/complete hypervisor state loss
*/
pnv_restore_hyp_resource_arch300:
+ mfspr r5, SPRN_PSSCR
+ std r5, PACA_WAKEUP_PSSCR(r13)
/*
* Workaround for POWER9, if we lost resources, the ERAT
* might have been mixed up and needs flushing. We also need
@@ -832,6 +775,19 @@ subcore_state_restored:
first_thread_in_core:
+BEGIN_FTR_SECTION
+ ld r3,STOP_SPRS(r13)
+ li r4,SCOPE_CORE
+ ld r5,PACA_WAKEUP_PSSCR(r13)
+ mr r6,r19 /*r19 contains SRR1*/
+ bl opal_cpuidle_restore
+ ld r1,PACAR1(r13)
+ xoris r15,r15,PNV_CORE_IDLE_LOCK_BIT@h
+ lwsync
+ stw r15,0(r14)
+ b hypervisor_state_restored
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
+
/*
* First thread in the core waking up from any state which can cause
* partial or complete hypervisor state loss. It needs to
@@ -865,14 +821,6 @@ timebase_resync:
* complete hypervisor state loss. Restore per core hypervisor
* state.
*/
-BEGIN_FTR_SECTION
- ld r4,_PTCR(r1)
- mtspr SPRN_PTCR,r4
- ld r4,_RPR(r1)
- mtspr SPRN_RPR,r4
- ld r4,_AMOR(r1)
- mtspr SPRN_AMOR,r4
-END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
ld r4,_TSCR(r1)
mtspr SPRN_TSCR,r4
@@ -885,6 +833,17 @@ clear_lock:
stw r15,0(r14)
common_exit:
+
+BEGIN_FTR_SECTION
+ ld r3,STOP_SPRS(r13)
+ li r4,SCOPE_THREAD
+ ld r5,PACA_WAKEUP_PSSCR(r13)
+ mr r6,r19 /*r19 contains SRR1*/
+ bl opal_cpuidle_restore
+ ld r1,PACAR1(r13)
+ b hypervisor_state_restored
+END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
+
/*
* Common to all threads.
*
@@ -934,17 +893,6 @@ no_segments:
mtctr r12
bctrl
-/*
- * On POWER9, we can come here on wakeup from a cpuidle stop state.
- * Hence restore the additional SPRs to the saved value.
- *
- * On POWER8, we come here only on winkle. Since winkle is used
- * only in the case of CPU-Hotplug, we don't need to restore
- * the additional SPRs.
- */
-BEGIN_FTR_SECTION
- bl power9_restore_additional_sprs
-END_FTR_SECTION_IFSET(CPU_FTR_ARCH_300)
hypervisor_state_restored:
mr r12,r19
@@ -135,6 +135,7 @@ static int pnv_save_sprs_for_deep_states(void)
return 0;
}
+#define MAX_STOP_SPRS_COUNT 25
static void pnv_alloc_idle_core_states(void)
{
int i, j;
@@ -174,6 +175,9 @@ static void pnv_alloc_idle_core_states(void)
for (j = 0; j < threads_per_core; j++) {
int cpu = first_cpu + j;
+ paca_ptrs[cpu]->opal_stop_sprs = kmalloc_node(
+ MAX_STOP_SPRS_COUNT * sizeof(u64),
+ GFP_KERNEL, node);
paca_ptrs[cpu]->core_idle_state_ptr = core_idle_state;
paca_ptrs[cpu]->thread_idle_state = PNV_THREAD_RUNNING;
paca_ptrs[cpu]->thread_mask = 1 << j;
@@ -327,3 +327,5 @@ OPAL_CALL(opal_npu_tl_set, OPAL_NPU_TL_SET);
OPAL_CALL(opal_pci_get_pbcq_tunnel_bar, OPAL_PCI_GET_PBCQ_TUNNEL_BAR);
OPAL_CALL(opal_pci_set_pbcq_tunnel_bar, OPAL_PCI_SET_PBCQ_TUNNEL_BAR);
OPAL_CALL(opal_sensor_read_u64, OPAL_SENSOR_READ_U64);
+OPAL_CALL(opal_cpuidle_save, OPAL_IDLE_SAVE);
+OPAL_CALL(opal_cpuidle_restore, OPAL_IDLE_RESTORE);
@@ -2431,14 +2431,12 @@ static void dump_one_paca(int cpu)
DUMP(p, subcore_sibling_mask, "%#-*x");
DUMP(p, thread_sibling_pacas, "%-*px");
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");
+
+ /* TODO paca still has sprs stored, but only opal knows the index for
+ * each spr. We can find a way to make the indices available to kernel.
+ */
+
#endif
DUMP(p, accounting.utime, "%#-*lx");
This patch moves the saving and restoring of sprs for P9 cpuidle from kernel to opal. This patch still uses existing code to detect first thread in core. In an attempt to make the powernv idle code backward compatible, and to some extent forward compatible, add support for pre-stop entry and post-stop exit actions in OPAL. If a kernel knows about this opal call, then just a firmware supporting newer hardware is required, instead of waiting for kernel updates. Signed-off-by: Abhishek Goel <huntbag@linux.vnet.ibm.com> --- Link to the Skiboot patch corresponding to this patch: http://patchwork.ozlabs.org/patch/947568/ arch/powerpc/include/asm/cpuidle.h | 10 -- arch/powerpc/include/asm/opal-api.h | 4 +- arch/powerpc/include/asm/opal.h | 3 + arch/powerpc/include/asm/paca.h | 5 +- arch/powerpc/kernel/asm-offsets.c | 10 +- arch/powerpc/kernel/idle_book3s.S | 130 ++++++------------ arch/powerpc/platforms/powernv/idle.c | 4 + .../powerpc/platforms/powernv/opal-wrappers.S | 2 + arch/powerpc/xmon/xmon.c | 12 +- 9 files changed, 61 insertions(+), 119 deletions(-)