li r10,0; \
ld r11,exception_marker@toc(r2); \
std r10,RESULT(r1); /* clear regs->result */ \
- std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */
+ std r11,STACK_FRAME_OVERHEAD-16(r1); /* mark the frame */ \
+ ACCOUNT_STOLEN_TIME
/*
* Exception vectors.
extern struct slb_shadow slb_shadow[];
+/*
+ * Layout of entries in the hypervisor's dispatch trace log buffer.
+ */
+struct dtl_entry {
+ u8 dispatch_reason;
+ u8 preempt_reason;
+ u16 processor_id;
+ u32 enqueue_to_dispatch_time;
+ u32 ready_to_enqueue_time;
+ u32 waiting_to_ready_time;
+ u64 timebase;
+ u64 fault_addr;
+ u64 srr0;
+ u64 srr1;
+};
+
+#define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
+#define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
+
#endif /* CONFIG_PPC_BOOK3S */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_LPPACA_H */
u8 kexec_state; /* set when kexec down has irqs off */
#ifdef CONFIG_PPC_STD_MMU_64
struct slb_shadow *slb_shadow_ptr;
+ struct dtl_entry *dispatch_log;
+ struct dtl_entry *dispatch_log_end;
/*
* Now, starting in cacheline 2, the exception save areas
/* Stuff for accurate time accounting */
u64 user_time; /* accumulated usermode TB ticks */
u64 system_time; /* accumulated system TB ticks */
- u64 startpurr; /* PURR/TB value snapshot */
+ u64 user_time_scaled; /* accumulated usermode SPURR ticks */
+ u64 starttime; /* TB value snapshot */
+ u64 starttime_user; /* TB value on exit to usermode */
u64 startspurr; /* SPURR value snapshot */
+ u64 utime_sspurr; /* ->user_time when ->startspurr set */
+ u64 stolen_time; /* TB ticks taken by hypervisor */
+ u64 dtl_ridx; /* read index in dispatch log */
+ struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */
#ifdef CONFIG_KVM_BOOK3S_HANDLER
/* We use this to store guest state in */
#include <asm/asm-compat.h>
#include <asm/processor.h>
#include <asm/ppc-opcode.h>
+#include <asm/firmware.h>
#ifndef __ASSEMBLY__
#error __FILE__ should only be used in assembler files
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
#define ACCOUNT_CPU_USER_ENTRY(ra, rb)
#define ACCOUNT_CPU_USER_EXIT(ra, rb)
+#define ACCOUNT_STOLEN_TIME
#else
#define ACCOUNT_CPU_USER_ENTRY(ra, rb) \
beq 2f; /* if from kernel mode */ \
-BEGIN_FTR_SECTION; \
- mfspr ra,SPRN_PURR; /* get processor util. reg */ \
-END_FTR_SECTION_IFSET(CPU_FTR_PURR); \
-BEGIN_FTR_SECTION; \
- MFTB(ra); /* or get TB if no PURR */ \
-END_FTR_SECTION_IFCLR(CPU_FTR_PURR); \
- ld rb,PACA_STARTPURR(r13); \
- std ra,PACA_STARTPURR(r13); \
+ MFTB(ra); /* get timebase */ \
+ ld rb,PACA_STARTTIME_USER(r13); \
+ std ra,PACA_STARTTIME(r13); \
subf rb,rb,ra; /* subtract start value */ \
ld ra,PACA_USER_TIME(r13); \
add ra,ra,rb; /* add on to user time */ \
2:
#define ACCOUNT_CPU_USER_EXIT(ra, rb) \
-BEGIN_FTR_SECTION; \
- mfspr ra,SPRN_PURR; /* get processor util. reg */ \
-END_FTR_SECTION_IFSET(CPU_FTR_PURR); \
-BEGIN_FTR_SECTION; \
- MFTB(ra); /* or get TB if no PURR */ \
-END_FTR_SECTION_IFCLR(CPU_FTR_PURR); \
- ld rb,PACA_STARTPURR(r13); \
- std ra,PACA_STARTPURR(r13); \
+ MFTB(ra); /* get timebase */ \
+ ld rb,PACA_STARTTIME(r13); \
+ std ra,PACA_STARTTIME_USER(r13); \
subf rb,rb,ra; /* subtract start value */ \
ld ra,PACA_SYSTEM_TIME(r13); \
- add ra,ra,rb; /* add on to user time */ \
- std ra,PACA_SYSTEM_TIME(r13);
-#endif
+ add ra,ra,rb; /* add on to system time */ \
+ std ra,PACA_SYSTEM_TIME(r13)
+
+#ifdef CONFIG_PPC_SPLPAR
+#define ACCOUNT_STOLEN_TIME \
+BEGIN_FW_FTR_SECTION; \
+ beq 33f; \
+ /* from user - see if there are any DTL entries to process */ \
+ ld r10,PACALPPACAPTR(r13); /* get ptr to VPA */ \
+ ld r11,PACA_DTL_RIDX(r13); /* get log read index */ \
+ ld r10,LPPACA_DTLIDX(r10); /* get log write index */ \
+ cmpd cr1,r11,r10; \
+ beq+ cr1,33f; \
+ bl .accumulate_stolen_time; \
+33: \
+END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
+
+#else /* CONFIG_PPC_SPLPAR */
+#define ACCOUNT_STOLEN_TIME
+
+#endif /* CONFIG_PPC_SPLPAR */
+
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
/*
* Macros for storing registers into and loading registers from
extern void GregorianDay(struct rtc_time *tm);
extern void generic_calibrate_decr(void);
-extern void snapshot_timebase(void);
extern void set_dec_cpu6(unsigned int val);
DECLARE_PER_CPU(struct cpu_usage, cpu_usage_array);
#if defined(CONFIG_VIRT_CPU_ACCOUNTING)
-extern void calculate_steal_time(void);
-extern void snapshot_timebases(void);
#define account_process_vtime(tsk) account_process_tick(tsk, 0)
#else
-#define calculate_steal_time() do { } while (0)
-#define snapshot_timebases() do { } while (0)
#define account_process_vtime(tsk) do { } while (0)
#endif
offsetof(struct slb_shadow, save_area[SLB_NUM_BOLTED - 1].vsid));
DEFINE(SLBSHADOW_STACKESID,
offsetof(struct slb_shadow, save_area[SLB_NUM_BOLTED - 1].esid));
+ DEFINE(SLBSHADOW_SAVEAREA, offsetof(struct slb_shadow, save_area));
DEFINE(LPPACASRR0, offsetof(struct lppaca, saved_srr0));
DEFINE(LPPACASRR1, offsetof(struct lppaca, saved_srr1));
DEFINE(LPPACAANYINT, offsetof(struct lppaca, int_dword.any_int));
DEFINE(LPPACADECRINT, offsetof(struct lppaca, int_dword.fields.decr_int));
- DEFINE(SLBSHADOW_SAVEAREA, offsetof(struct slb_shadow, save_area));
+ DEFINE(LPPACA_DTLIDX, offsetof(struct lppaca, dtl_idx));
+ DEFINE(PACA_DTL_RIDX, offsetof(struct paca_struct, dtl_ridx));
#endif /* CONFIG_PPC_STD_MMU_64 */
DEFINE(PACAEMERGSP, offsetof(struct paca_struct, emergency_sp));
DEFINE(PACAHWCPUID, offsetof(struct paca_struct, hw_cpu_id));
DEFINE(PACAKEXECSTATE, offsetof(struct paca_struct, kexec_state));
- DEFINE(PACA_STARTPURR, offsetof(struct paca_struct, startpurr));
- DEFINE(PACA_STARTSPURR, offsetof(struct paca_struct, startspurr));
+ DEFINE(PACA_STARTTIME, offsetof(struct paca_struct, starttime));
+ DEFINE(PACA_STARTTIME_USER, offsetof(struct paca_struct, starttime_user));
DEFINE(PACA_USER_TIME, offsetof(struct paca_struct, user_time));
DEFINE(PACA_SYSTEM_TIME, offsetof(struct paca_struct, system_time));
DEFINE(PACA_TRAP_SAVE, offsetof(struct paca_struct, trap_save));
addi r9,r1,STACK_FRAME_OVERHEAD
ld r11,exception_marker@toc(r2)
std r11,-16(r9) /* "regshere" marker */
+#if defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR)
+BEGIN_FW_FTR_SECTION
+ beq 33f
+ /* if from user, see if there are any DTL entries to process */
+ ld r10,PACALPPACAPTR(r13) /* get ptr to VPA */
+ ld r11,PACA_DTL_RIDX(r13) /* get log read index */
+ ld r10,LPPACA_DTLIDX(r10) /* get log write index */
+ cmpd cr1,r11,r10
+ beq+ cr1,33f
+ bl .accumulate_stolen_time
+ REST_GPR(0,r1)
+ REST_4GPRS(3,r1)
+ REST_2GPRS(7,r1)
+ addi r9,r1,STACK_FRAME_OVERHEAD
+33:
+END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING && CONFIG_PPC_SPLPAR */
+
#ifdef CONFIG_TRACE_IRQFLAGS
bl .trace_hardirqs_on
REST_GPR(0,r1)
account_system_vtime(current);
account_process_vtime(current);
- calculate_steal_time();
/*
* We can't take a PMU exception inside _switch() since there is a
if (smp_ops->take_timebase)
smp_ops->take_timebase();
- if (system_state > SYSTEM_BOOTING)
- snapshot_timebase();
-
secondary_cpu_time_init();
ipi_call_lock();
free_cpumask_var(old_mask);
- snapshot_timebases();
-
dump_numa_cpu_topology();
}
EXPORT_SYMBOL(ppc_proc_freq);
unsigned long ppc_tb_freq;
-static DEFINE_PER_CPU(u64, last_jiffy);
-
#ifdef CONFIG_VIRT_CPU_ACCOUNTING
/*
* Factors for converting from cputime_t (timebase ticks) to
}
/*
- * Read the PURR on systems that have it, otherwise the timebase.
+ * Read the SPURR on systems that have it, otherwise the PURR,
+ * or if that doesn't exist return the timebase value passed in.
*/
-static u64 read_purr(void)
+static u64 read_spurr(u64 tb)
{
+ if (cpu_has_feature(CPU_FTR_SPURR))
+ return mfspr(SPRN_SPURR);
if (cpu_has_feature(CPU_FTR_PURR))
return mfspr(SPRN_PURR);
- return mftb();
+ return tb;
}
+#ifdef CONFIG_PPC_SPLPAR
+
/*
- * Read the SPURR on systems that have it, otherwise the purr
+ * Scan the dispatch trace log and count up the stolen time.
+ * Should be called with interrupts disabled.
*/
-static u64 read_spurr(u64 purr)
+static u64 scan_dispatch_log(u64 stop_tb)
{
- /*
- * cpus without PURR won't have a SPURR
- * We already know the former when we use this, so tell gcc
- */
- if (cpu_has_feature(CPU_FTR_PURR) && cpu_has_feature(CPU_FTR_SPURR))
- return mfspr(SPRN_SPURR);
- return purr;
+ unsigned long i = local_paca->dtl_ridx;
+ struct dtl_entry *dtl = local_paca->dtl_curr;
+ struct dtl_entry *dtl_end = local_paca->dispatch_log_end;
+ struct lppaca *vpa = local_paca->lppaca_ptr;
+ u64 tb_delta;
+ u64 stolen = 0;
+ u64 dtb;
+
+ if (i == vpa->dtl_idx)
+ return 0;
+ while (i < vpa->dtl_idx) {
+ dtb = dtl->timebase;
+ tb_delta = dtl->enqueue_to_dispatch_time +
+ dtl->ready_to_enqueue_time;
+ barrier();
+ if (i + N_DISPATCH_LOG < vpa->dtl_idx) {
+ /* buffer has overflowed */
+ i = vpa->dtl_idx - N_DISPATCH_LOG;
+ dtl = local_paca->dispatch_log + (i % N_DISPATCH_LOG);
+ continue;
+ }
+ if (dtb > stop_tb)
+ break;
+ stolen += tb_delta;
+ ++i;
+ ++dtl;
+ if (dtl == dtl_end)
+ dtl = local_paca->dispatch_log;
+ }
+ local_paca->dtl_ridx = i;
+ local_paca->dtl_curr = dtl;
+ return stolen;
}
+/*
+ * Accumulate stolen time by scanning the dispatch trace log.
+ * Called on entry from user mode.
+ */
+void accumulate_stolen_time(void)
+{
+ u64 sst, ust;
+
+ sst = scan_dispatch_log(get_paca()->starttime_user);
+ ust = scan_dispatch_log(get_paca()->starttime);
+ get_paca()->system_time -= sst;
+ get_paca()->user_time -= ust;
+ get_paca()->stolen_time += ust + sst;
+}
+
+static inline u64 calculate_stolen_time(u64 stop_tb)
+{
+ u64 stolen = 0;
+
+ if (get_paca()->dtl_ridx != get_paca()->lppaca_ptr->dtl_idx) {
+ stolen = scan_dispatch_log(stop_tb);
+ get_paca()->system_time -= stolen;
+ }
+
+ stolen += get_paca()->stolen_time;
+ get_paca()->stolen_time = 0;
+ return stolen;
+}
+
+#else /* CONFIG_PPC_SPLPAR */
+static inline u64 calculate_stolen_time(u64 stop_tb)
+{
+ return 0;
+}
+
+#endif /* CONFIG_PPC_SPLPAR */
+
/*
* Account time for a transition between system, hard irq
* or soft irq state.
*/
void account_system_vtime(struct task_struct *tsk)
{
- u64 now, nowscaled, delta, deltascaled, sys_time;
+ u64 now, nowscaled, delta, deltascaled;
unsigned long flags;
+ u64 stolen, udelta, sys_scaled, user_scaled;
local_irq_save(flags);
- now = read_purr();
+ now = mftb();
nowscaled = read_spurr(now);
- delta = now - get_paca()->startpurr;
+ get_paca()->system_time += now - get_paca()->starttime;
+ get_paca()->starttime = now;
deltascaled = nowscaled - get_paca()->startspurr;
- get_paca()->startpurr = now;
get_paca()->startspurr = nowscaled;
- if (!in_interrupt()) {
- /* deltascaled includes both user and system time.
- * Hence scale it based on the purr ratio to estimate
- * the system time */
- sys_time = get_paca()->system_time;
- if (get_paca()->user_time)
- deltascaled = deltascaled * sys_time /
- (sys_time + get_paca()->user_time);
- delta += sys_time;
- get_paca()->system_time = 0;
+
+ stolen = calculate_stolen_time(now);
+
+ delta = get_paca()->system_time;
+ get_paca()->system_time = 0;
+ udelta = get_paca()->user_time - get_paca()->utime_sspurr;
+ get_paca()->utime_sspurr = get_paca()->user_time;
+
+ /*
+ * Because we don't read the SPURR on every kernel entry/exit,
+ * deltascaled includes both user and system SPURR ticks.
+ * Apportion these ticks to system SPURR ticks and user
+ * SPURR ticks in the same ratio as the system time (delta)
+ * and user time (udelta) values obtained from the timebase
+ * over the same interval. The system ticks get accounted here;
+ * the user ticks get saved up in paca->user_time_scaled to be
+ * used by account_process_tick.
+ */
+ sys_scaled = delta;
+ user_scaled = udelta;
+ if (deltascaled != delta + udelta) {
+ if (udelta) {
+ sys_scaled = deltascaled * delta / (delta + udelta);
+ user_scaled = deltascaled - sys_scaled;
+ } else {
+ sys_scaled = deltascaled;
+ }
+ }
+ get_paca()->user_time_scaled += user_scaled;
+
+ if (in_irq() || idle_task(smp_processor_id()) != tsk) {
+ account_system_time(tsk, 0, delta, sys_scaled);
+ if (stolen)
+ account_steal_time(stolen);
+ } else {
+ account_idle_time(delta + stolen);
}
- if (in_irq() || idle_task(smp_processor_id()) != tsk)
- account_system_time(tsk, 0, delta, deltascaled);
- else
- account_idle_time(delta);
- __get_cpu_var(cputime_last_delta) = delta;
- __get_cpu_var(cputime_scaled_last_delta) = deltascaled;
local_irq_restore(flags);
}
EXPORT_SYMBOL_GPL(account_system_vtime);
* by the exception entry and exit code to the generic process
* user and system time records.
* Must be called with interrupts disabled.
+ * Assumes that account_system_vtime() has been called recently
+ * (i.e. since the last entry from usermode) so that
+ * get_paca()->user_time_scaled is up to date.
*/
void account_process_tick(struct task_struct *tsk, int user_tick)
{
cputime_t utime, utimescaled;
utime = get_paca()->user_time;
+ utimescaled = get_paca()->user_time_scaled;
get_paca()->user_time = 0;
- utimescaled = cputime_to_scaled(utime);
+ get_paca()->user_time_scaled = 0;
+ get_paca()->utime_sspurr = 0;
account_user_time(tsk, utime, utimescaled);
}
-/*
- * Stuff for accounting stolen time.
- */
-struct cpu_purr_data {
- int initialized; /* thread is running */
- u64 tb; /* last TB value read */
- u64 purr; /* last PURR value read */
- u64 spurr; /* last SPURR value read */
-};
-
-/*
- * Each entry in the cpu_purr_data array is manipulated only by its
- * "owner" cpu -- usually in the timer interrupt but also occasionally
- * in process context for cpu online. As long as cpus do not touch
- * each others' cpu_purr_data, disabling local interrupts is
- * sufficient to serialize accesses.
- */
-static DEFINE_PER_CPU(struct cpu_purr_data, cpu_purr_data);
-
-static void snapshot_tb_and_purr(void *data)
-{
- unsigned long flags;
- struct cpu_purr_data *p = &__get_cpu_var(cpu_purr_data);
-
- local_irq_save(flags);
- p->tb = get_tb_or_rtc();
- p->purr = mfspr(SPRN_PURR);
- wmb();
- p->initialized = 1;
- local_irq_restore(flags);
-}
-
-/*
- * Called during boot when all cpus have come up.
- */
-void snapshot_timebases(void)
-{
- if (!cpu_has_feature(CPU_FTR_PURR))
- return;
- on_each_cpu(snapshot_tb_and_purr, NULL, 1);
-}
-
-/*
- * Must be called with interrupts disabled.
- */
-void calculate_steal_time(void)
-{
- u64 tb, purr;
- s64 stolen;
- struct cpu_purr_data *pme;
-
- pme = &__get_cpu_var(cpu_purr_data);
- if (!pme->initialized)
- return; /* !CPU_FTR_PURR or early in early boot */
- tb = mftb();
- purr = mfspr(SPRN_PURR);
- stolen = (tb - pme->tb) - (purr - pme->purr);
- if (stolen > 0) {
- if (idle_task(smp_processor_id()) != current)
- account_steal_time(stolen);
- else
- account_idle_time(stolen);
- }
- pme->tb = tb;
- pme->purr = purr;
-}
-
-#ifdef CONFIG_PPC_SPLPAR
-/*
- * Must be called before the cpu is added to the online map when
- * a cpu is being brought up at runtime.
- */
-static void snapshot_purr(void)
-{
- struct cpu_purr_data *pme;
- unsigned long flags;
-
- if (!cpu_has_feature(CPU_FTR_PURR))
- return;
- local_irq_save(flags);
- pme = &__get_cpu_var(cpu_purr_data);
- pme->tb = mftb();
- pme->purr = mfspr(SPRN_PURR);
- pme->initialized = 1;
- local_irq_restore(flags);
-}
-
-#endif /* CONFIG_PPC_SPLPAR */
-
#else /* ! CONFIG_VIRT_CPU_ACCOUNTING */
#define calc_cputime_factors()
-#define calculate_steal_time() do { } while (0)
#endif
-#if !(defined(CONFIG_VIRT_CPU_ACCOUNTING) && defined(CONFIG_PPC_SPLPAR))
-#define snapshot_purr() do { } while (0)
-#endif
-
-/*
- * Called when a cpu comes up after the system has finished booting,
- * i.e. as a result of a hotplug cpu action.
- */
-void snapshot_timebase(void)
-{
- __get_cpu_var(last_jiffy) = get_tb_or_rtc();
- snapshot_purr();
-}
-
void __delay(unsigned long loops)
{
unsigned long start;
old_regs = set_irq_regs(regs);
irq_enter();
- calculate_steal_time();
-
if (test_perf_event_pending()) {
clear_perf_event_pending();
perf_event_do_pending();
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/firmware.h>
+#include <asm/lppaca.h>
#include "plpar_wrappers.h"
-/*
- * Layout of entries in the hypervisor's DTL buffer. Although we don't
- * actually access the internals of an entry (we only need to know the size),
- * we might as well define it here for reference.
- */
-struct dtl_entry {
- u8 dispatch_reason;
- u8 preempt_reason;
- u16 processor_id;
- u32 enqueue_to_dispatch_time;
- u32 ready_to_enqueue_time;
- u32 waiting_to_ready_time;
- u64 timebase;
- u64 fault_addr;
- u64 srr0;
- u64 srr1;
-};
-
struct dtl {
struct dtl_entry *buf;
struct dentry *file;
struct dentry *event_mask_file, *buf_entries_file;
int rc, i;
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+ /* disable this for now */
+ return -ENODEV;
+#endif
+
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return -ENODEV;
int hwcpu = get_hard_smp_processor_id(cpu);
unsigned long addr;
long ret;
+ struct paca_struct *pp;
+ struct dtl_entry *dtl;
if (cpu_has_feature(CPU_FTR_ALTIVEC))
lppaca_of(cpu).vmxregs_in_use = 1;
"registration for cpu %d (hw %d) of area %lx "
"returns %ld\n", cpu, hwcpu, addr, ret);
}
+
+ /*
+ * Register dispatch trace log, if one has been allocated.
+ */
+ pp = &paca[cpu];
+ dtl = pp->dispatch_log;
+ if (dtl) {
+ pp->dtl_ridx = 0;
+ pp->dtl_curr = dtl;
+ lppaca_of(cpu).dtl_idx = 0;
+
+ /* hypervisor reads buffer length from this field */
+ dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
+ ret = register_dtl(hwcpu, __pa(dtl));
+ if (ret)
+ pr_warn("DTL registration failed for cpu %d (%ld)\n",
+ cpu, ret);
+ lppaca_of(cpu).dtl_enable_mask = 2;
+ }
}
static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
.notifier_call = pci_dn_reconfig_notifier,
};
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+/*
+ * Allocate space for the dispatch trace log for all possible cpus
+ * and register the buffers with the hypervisor. This is used for
+ * computing time stolen by the hypervisor.
+ */
+static int alloc_dispatch_logs(void)
+{
+ int cpu, ret;
+ struct paca_struct *pp;
+ struct dtl_entry *dtl;
+
+ if (!firmware_has_feature(FW_FEATURE_SPLPAR))
+ return 0;
+
+ for_each_possible_cpu(cpu) {
+ pp = &paca[cpu];
+ dtl = kmalloc_node(DISPATCH_LOG_BYTES, GFP_KERNEL,
+ cpu_to_node(cpu));
+ if (!dtl) {
+ pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
+ cpu);
+ pr_warn("Stolen time statistics will be unreliable\n");
+ break;
+ }
+
+ pp->dtl_ridx = 0;
+ pp->dispatch_log = dtl;
+ pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
+ pp->dtl_curr = dtl;
+ }
+
+ /* Register the DTL for the current (boot) cpu */
+ dtl = get_paca()->dispatch_log;
+ get_paca()->dtl_ridx = 0;
+ get_paca()->dtl_curr = dtl;
+ get_paca()->lppaca_ptr->dtl_idx = 0;
+
+ /* hypervisor reads buffer length from this field */
+ dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
+ ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
+ if (ret)
+ pr_warn("DTL registration failed for boot cpu %d (%d)\n",
+ smp_processor_id(), ret);
+ get_paca()->lppaca_ptr->dtl_enable_mask = 2;
+
+ return 0;
+}
+
+early_initcall(alloc_dispatch_logs);
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
+
static void __init pSeries_setup_arch(void)
{
/* Discover PIC type and setup ppc_md accordingly */
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