/*
* Waiting for a read lock or a write lock on a rwlock...
* This turns out to be the same for read and write locks, since
* we only know the holder if it is write-locked.
*/
void __rw_yield(raw_rwlock_t *rw)
{
int lock_value;
unsigned int holder_cpu, yield_count;
lock_value = rw->lock;
if (lock_value >= 0)
return; /* no write lock at present */
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
yield_count = lppaca[holder_cpu].yield_count;
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();
if (rw->lock != lock_value)
return; /* something has changed */
if (firmware_has_feature(FW_FEATURE_ISERIES))
HvCall2(HvCallBaseYieldProcessor, HvCall_YieldToProc,
((u64)holder_cpu << 32) | yield_count);
#ifdef CONFIG_PPC_SPLPAR
else
plpar_hcall_norets(H_CONFER,
get_hard_smp_processor_id(holder_cpu), yield_count);
#endif
}
/*=====================================================================
*/
void HvCall_writeLogBuffer(const void *buffer, u64 bufLen)
{
struct HvLpBufferList bufList;
u64 bytesLeft = bufLen;
u64 leftThisPage;
u64 curPtr = virt_to_absolute((unsigned long) buffer);
while (bytesLeft) {
bufList.addr = curPtr;
leftThisPage = ((curPtr & PAGE_MASK) + PAGE_SIZE) - curPtr;
if (leftThisPage > bytesLeft) {
bufList.len = bytesLeft;
bytesLeft = 0;
} else {
bufList.len = leftThisPage;
bytesLeft -= leftThisPage;
}
HvCall2(HvCallBaseWriteLogBuffer,
virt_to_absolute((unsigned long) &bufList),
bufList.len);
curPtr = (curPtr & PAGE_MASK) + PAGE_SIZE;
}
}
void __spin_yield(raw_spinlock_t *lock)
{
unsigned int lock_value, holder_cpu, yield_count;
struct paca_struct *holder_paca;
lock_value = lock->slock;
if (lock_value == 0)
return;
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
holder_paca = &paca[holder_cpu];
yield_count = holder_paca->lppaca.yield_count;
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();
if (lock->slock != lock_value)
return; /* something has changed */
#ifdef CONFIG_PPC_ISERIES
HvCall2(HvCallBaseYieldProcessor, HvCall_YieldToProc,
((u64)holder_cpu << 32) | yield_count);
#else
plpar_hcall_norets(H_CONFER, get_hard_smp_processor_id(holder_cpu),
yield_count);
#endif
}
void __spin_yield(__raw_spinlock_t *lock)
{
unsigned int lock_value, holder_cpu, yield_count;
lock_value = lock->slock;
if (lock_value == 0)
return;
holder_cpu = lock_value & 0xffff;
BUG_ON(holder_cpu >= NR_CPUS);
yield_count = lppaca[holder_cpu].yield_count;
if ((yield_count & 1) == 0)
return; /* virtual cpu is currently running */
rmb();
if (lock->slock != lock_value)
return; /* something has changed */
if (firmware_has_feature(FW_FEATURE_ISERIES))
HvCall2(HvCallBaseYieldProcessor, HvCall_YieldToProc,
((u64)holder_cpu << 32) | yield_count);
else
plpar_hcall_norets(H_CONFER,
get_hard_smp_processor_id(holder_cpu), yield_count);
}
