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Commit bde4e4ee authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Do not call winfix_dax blindly 



Verify we really are taking a data access exception trap, at TL1, from
one of the window spill/fill handlers.

Else call a new function, data_access_exception_tl1, to log the error.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5ea68e02

arch/sparc64/kernel/entry.S

+16 −0
Original line number Diff line number Diff line
@@ -701,8 +701,24 @@ __do_data_access_exception_tl1: 
	ldxa		[%g5] ASI_DMMU, %g5	! Get SFAR

	stxa		%g0, [%g3] ASI_DMMU	! Clear SFSR.FaultValid bit

	membar		#Sync

	rdpr		%tt, %g3

	cmp		%g3, 0x80		! first win spill/fill trap

	blu,pn		%xcc, 1f

	 cmp		%g3, 0xff		! last win spill/fill trap

	bgu,pn		%xcc, 1f

	 nop

	ba,pt		%xcc, winfix_dax

	 rdpr		%tpc, %g3

1:	sethi		%hi(109f), %g7

	ba,pt		%xcc, etraptl1

109:	 or		%g7, %lo(109b), %g7

	mov		%l4, %o1

	mov		%l5, %o2

	call		data_access_exception_tl1

	 add		%sp, PTREGS_OFF, %o0

	ba,pt		%xcc, rtrap

	 clr		%l6



__do_data_access_exception:

	rdpr		%pstate, %g4

	wrpr		%g4, PSTATE_MG|PSTATE_AG, %pstate

arch/sparc64/kernel/traps.c

+11 −0
Original line number Diff line number Diff line
@@ -220,6 +220,17 @@ void data_access_exception(struct pt_regs *regs, 
	force_sig_info(SIGSEGV, &info, current);

}



void data_access_exception_tl1(struct pt_regs *regs,

			       unsigned long sfsr, unsigned long sfar)

{

	if (notify_die(DIE_TRAP_TL1, "data access exception tl1", regs,

		       0, 0x30, SIGTRAP) == NOTIFY_STOP)

		return;



	dump_tl1_traplog((struct tl1_traplog *)(regs + 1));

	data_access_exception(regs, sfsr, sfar);

}



#ifdef CONFIG_PCI

/* This is really pathetic... */

extern volatile int pci_poke_in_progress;