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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

Browse Source 
Pull s390 fixes from Martin Schwidefsky:
 "Three kvm related memory management fixes, a fix for show_trace, a fix
  for early console output and a patch from Ben to help prevent compile
  errors in regard to irq functions (or our lack thereof)"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/pci: Implement IRQ functions if !PCI
  s390/sclp: fix new line detection
  s390/pgtable: make pgste lock an explicit barrier
  s390/pgtable: Save pgste during modify_prot_start/commit
  s390/dumpstack: fix address ranges for asynchronous and panic stack
  s390/pgtable: Fix guest overindication for change bit
This commit is contained in:
Linus Torvalds 2013-06-13 11:02:31 -07:00
commit dcae7f2dfc
5 changed files with 95 additions and 48 deletions
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32
arch/s390/include/asm/pgtable.h
View File

@ -623,7 +623,7 @@ static inline pgste_t pgste_get_lock(pte_t *ptep)
" csg %0,%1,%2\n"
" jl 0b\n"
: "=&d" (old), "=&d" (new), "=Q" (ptep[PTRS_PER_PTE])
: "Q" (ptep[PTRS_PER_PTE]) : "cc");
: "Q" (ptep[PTRS_PER_PTE]) : "cc", "memory");
#endif
return __pgste(new);
}
@ -635,11 +635,19 @@ static inline void pgste_set_unlock(pte_t *ptep, pgste_t pgste)
" nihh %1,0xff7f\n" /* clear RCP_PCL_BIT */
" stg %1,%0\n"
: "=Q" (ptep[PTRS_PER_PTE])
: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE]) : "cc");
: "d" (pgste_val(pgste)), "Q" (ptep[PTRS_PER_PTE])
: "cc", "memory");
preempt_enable();
#endif
}
static inline void pgste_set(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
*(pgste_t *)(ptep + PTRS_PER_PTE) = pgste;
#endif
}
static inline pgste_t pgste_update_all(pte_t *ptep, pgste_t pgste)
{
#ifdef CONFIG_PGSTE
@ -704,17 +712,19 @@ static inline void pgste_set_key(pte_t *ptep, pgste_t pgste, pte_t entry)
{
#ifdef CONFIG_PGSTE
unsigned long address;
unsigned long okey, nkey;
unsigned long nkey;
if (pte_val(entry) & _PAGE_INVALID)
return;
VM_BUG_ON(!(pte_val(*ptep) & _PAGE_INVALID));
address = pte_val(entry) & PAGE_MASK;
okey = nkey = page_get_storage_key(address);
nkey &= ~(_PAGE_ACC_BITS | _PAGE_FP_BIT);
/* Set page access key and fetch protection bit from pgste */
nkey |= (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
if (okey != nkey)
page_set_storage_key(address, nkey, 0);
/*
* Set page access key and fetch protection bit from pgste.
* The guest C/R information is still in the PGSTE, set real
* key C/R to 0.
*/
nkey = (pgste_val(pgste) & (RCP_ACC_BITS | RCP_FP_BIT)) >> 56;
page_set_storage_key(address, nkey, 0);
#endif
}
@ -1099,8 +1109,10 @@ static inline pte_t ptep_modify_prot_start(struct mm_struct *mm,
if (!mm_exclusive(mm))
__ptep_ipte(address, ptep);
if (mm_has_pgste(mm))
if (mm_has_pgste(mm)) {
pgste = pgste_update_all(&pte, pgste);
pgste_set(ptep, pgste);
}
return pte;
}

12
arch/s390/kernel/dumpstack.c
View File

@ -74,6 +74,8 @@ __show_trace(unsigned long sp, unsigned long low, unsigned long high)
static void show_trace(struct task_struct *task, unsigned long *stack)
{
const unsigned long frame_size =
STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
register unsigned long __r15 asm ("15");
unsigned long sp;
@ -82,11 +84,13 @@ static void show_trace(struct task_struct *task, unsigned long *stack)
sp = task ? task->thread.ksp : __r15;
printk("Call Trace:\n");
#ifdef CONFIG_CHECK_STACK
sp = __show_trace(sp, S390_lowcore.panic_stack - 4096,
S390_lowcore.panic_stack);
sp = __show_trace(sp,
S390_lowcore.panic_stack + frame_size - 4096,
S390_lowcore.panic_stack + frame_size);
#endif
sp = __show_trace(sp, S390_lowcore.async_stack - ASYNC_SIZE,
S390_lowcore.async_stack);
sp = __show_trace(sp,
S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
S390_lowcore.async_stack + frame_size);
if (task)
__show_trace(sp, (unsigned long) task_stack_page(task),
(unsigned long) task_stack_page(task) + THREAD_SIZE);

64
arch/s390/kernel/irq.c
View File

@ -311,3 +311,67 @@ void measurement_alert_subclass_unregister(void)
spin_unlock(&ma_subclass_lock);
}
EXPORT_SYMBOL(measurement_alert_subclass_unregister);
void synchronize_irq(unsigned int irq)
{
/*
* Not needed, the handler is protected by a lock and IRQs that occur
* after the handler is deleted are just NOPs.
*/
}
EXPORT_SYMBOL_GPL(synchronize_irq);
#ifndef CONFIG_PCI
/* Only PCI devices have dynamically-defined IRQ handlers */
int request_irq(unsigned int irq, irq_handler_t handler,
unsigned long irqflags, const char *devname, void *dev_id)
{
return -EINVAL;
}
EXPORT_SYMBOL_GPL(request_irq);
void free_irq(unsigned int irq, void *dev_id)
{
WARN_ON(1);
}
EXPORT_SYMBOL_GPL(free_irq);
void enable_irq(unsigned int irq)
{
WARN_ON(1);
}
EXPORT_SYMBOL_GPL(enable_irq);
void disable_irq(unsigned int irq)
{
WARN_ON(1);
}
EXPORT_SYMBOL_GPL(disable_irq);
#endif /* !CONFIG_PCI */
void disable_irq_nosync(unsigned int irq)
{
disable_irq(irq);
}
EXPORT_SYMBOL_GPL(disable_irq_nosync);
unsigned long probe_irq_on(void)
{
return 0;
}
EXPORT_SYMBOL_GPL(probe_irq_on);
int probe_irq_off(unsigned long val)
{
return 0;
}
EXPORT_SYMBOL_GPL(probe_irq_off);
unsigned int probe_irq_mask(unsigned long val)
{
return val;
}
EXPORT_SYMBOL_GPL(probe_irq_mask);

2
arch/s390/kernel/sclp.S
View File

@ -225,7 +225,7 @@ _sclp_print:
ahi %r2,1
ltr %r0,%r0 # end of string?
jz .LfinalizemtoS4
chi %r0,0x15 # end of line (NL)?
chi %r0,0x0a # end of line (NL)?
jz .LfinalizemtoS4
stc %r0,0(%r6,%r7) # copy to mto
la %r11,0(%r6,%r7)

33
arch/s390/pci/pci.c
View File

@ -302,15 +302,6 @@ static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
return rc;
}
void synchronize_irq(unsigned int irq)
{
/*
* Not needed, the handler is protected by a lock and IRQs that occur
* after the handler is deleted are just NOPs.
*/
}
EXPORT_SYMBOL_GPL(synchronize_irq);
void enable_irq(unsigned int irq)
{
struct msi_desc *msi = irq_get_msi_desc(irq);
@ -327,30 +318,6 @@ void disable_irq(unsigned int irq)
}
EXPORT_SYMBOL_GPL(disable_irq);
void disable_irq_nosync(unsigned int irq)
{
disable_irq(irq);
}
EXPORT_SYMBOL_GPL(disable_irq_nosync);
unsigned long probe_irq_on(void)
{
return 0;
}
EXPORT_SYMBOL_GPL(probe_irq_on);
int probe_irq_off(unsigned long val)
{
return 0;
}
EXPORT_SYMBOL_GPL(probe_irq_off);
unsigned int probe_irq_mask(unsigned long val)
{
return val;
}
EXPORT_SYMBOL_GPL(probe_irq_mask);
void pcibios_fixup_bus(struct pci_bus *bus)
{
}