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Commit f9a42e0d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc 

Pull sparc fixes from David Miller:
 "Several small bug fixes and tidies, along with a fix for non-resumable
  memory errors triggered by userspace"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc64: Handle PIO & MEM non-resumable errors.
  sparc64: Zero pages on allocation for mondo and error queues.
  sparc: Fixed typo in sstate.c. Replaced panicing with panicking
  sparc: use symbolic names for tsb indexing
parents 751321b3 54791b27

arch/sparc/include/asm/mmu_context_64.h

+4 −4
Original line number Diff line number Diff line
@@ -35,15 +35,15 @@ void __tsb_context_switch(unsigned long pgd_pa, 
static inline void tsb_context_switch(struct mm_struct *mm)

{

	__tsb_context_switch(__pa(mm->pgd),

			     &mm->context.tsb_block[0],

			     &mm->context.tsb_block[MM_TSB_BASE],

#if defined(CONFIG_HUGETLB_PAGE) || defined(CONFIG_TRANSPARENT_HUGEPAGE)

			     (mm->context.tsb_block[1].tsb ?

			      &mm->context.tsb_block[1] :

			     (mm->context.tsb_block[MM_TSB_HUGE].tsb ?

			      &mm->context.tsb_block[MM_TSB_HUGE] :

			      NULL)

#else

			     NULL

#endif

			     , __pa(&mm->context.tsb_descr[0]));

			     , __pa(&mm->context.tsb_descr[MM_TSB_BASE]));

}



void tsb_grow(struct mm_struct *mm,

arch/sparc/kernel/irq_64.c

+1 −1
Original line number Diff line number Diff line
@@ -1021,7 +1021,7 @@ static void __init alloc_one_queue(unsigned long *pa_ptr, unsigned long qmask) 
	unsigned long order = get_order(size);

	unsigned long p;



	p = __get_free_pages(GFP_KERNEL, order);

	p = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);

	if (!p) {

		prom_printf("SUN4V: Error, cannot allocate queue.\n");

		prom_halt();

arch/sparc/kernel/sstate.c

+3 −3
Original line number Diff line number Diff line
@@ -43,8 +43,8 @@ static const char poweroff_msg[32] __attribute__((aligned(32))) = 
	"Linux powering off";

static const char rebooting_msg[32] __attribute__((aligned(32))) =

	"Linux rebooting";

static const char panicing_msg[32] __attribute__((aligned(32))) =

	"Linux panicing";

static const char panicking_msg[32] __attribute__((aligned(32))) =

	"Linux panicking";



static int sstate_reboot_call(struct notifier_block *np, unsigned long type, void *_unused)

{
@@ -76,7 +76,7 @@ static struct notifier_block sstate_reboot_notifier = { 


static int sstate_panic_event(struct notifier_block *n, unsigned long event, void *ptr)

{

	do_set_sstate(HV_SOFT_STATE_TRANSITION, panicing_msg);

	do_set_sstate(HV_SOFT_STATE_TRANSITION, panicking_msg);



	return NOTIFY_DONE;

}

arch/sparc/kernel/traps_64.c

+73 −0
Original line number Diff line number Diff line
@@ -2051,6 +2051,73 @@ void sun4v_resum_overflow(struct pt_regs *regs) 
	atomic_inc(&sun4v_resum_oflow_cnt);

}



/* Given a set of registers, get the virtual addressi that was being accessed

 * by the faulting instructions at tpc.

 */

static unsigned long sun4v_get_vaddr(struct pt_regs *regs)

{

	unsigned int insn;



	if (!copy_from_user(&insn, (void __user *)regs->tpc, 4)) {

		return compute_effective_address(regs, insn,

						 (insn >> 25) & 0x1f);

	}

	return 0;

}



/* Attempt to handle non-resumable errors generated from userspace.

 * Returns true if the signal was handled, false otherwise.

 */

bool sun4v_nonresum_error_user_handled(struct pt_regs *regs,

				  struct sun4v_error_entry *ent) {



	unsigned int attrs = ent->err_attrs;



	if (attrs & SUN4V_ERR_ATTRS_MEMORY) {

		unsigned long addr = ent->err_raddr;

		siginfo_t info;



		if (addr == ~(u64)0) {

			/* This seems highly unlikely to ever occur */

			pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory error detected in unknown location!\n");

		} else {

			unsigned long page_cnt = DIV_ROUND_UP(ent->err_size,

							      PAGE_SIZE);



			/* Break the unfortunate news. */

			pr_emerg("SUN4V NON-RECOVERABLE ERROR: Memory failed at %016lX\n",

				 addr);

			pr_emerg("SUN4V NON-RECOVERABLE ERROR:   Claiming %lu ages.\n",

				 page_cnt);



			while (page_cnt-- > 0) {

				if (pfn_valid(addr >> PAGE_SHIFT))

					get_page(pfn_to_page(addr >> PAGE_SHIFT));

				addr += PAGE_SIZE;

			}

		}

		info.si_signo = SIGKILL;

		info.si_errno = 0;

		info.si_trapno = 0;

		force_sig_info(info.si_signo, &info, current);



		return true;

	}

	if (attrs & SUN4V_ERR_ATTRS_PIO) {

		siginfo_t info;



		info.si_signo = SIGBUS;

		info.si_code = BUS_ADRERR;

		info.si_addr = (void __user *)sun4v_get_vaddr(regs);

		force_sig_info(info.si_signo, &info, current);



		return true;

	}



	/* Default to doing nothing */

	return false;

}



/* We run with %pil set to PIL_NORMAL_MAX and PSTATE_IE enabled in %pstate.

 * Log the event, clear the first word of the entry, and die.

 */
@@ -2075,6 +2142,12 @@ void sun4v_nonresum_error(struct pt_regs *regs, unsigned long offset) 


	put_cpu();



	if (!(regs->tstate & TSTATE_PRIV) &&

	    sun4v_nonresum_error_user_handled(regs, &local_copy)) {

		/* DON'T PANIC: This userspace error was handled. */

		return;

	}



#ifdef CONFIG_PCI

	/* Check for the special PCI poke sequence. */

	if (pci_poke_in_progress && pci_poke_cpu == cpu) {