Commit d2a28ad9 authored by Russ Anderson's avatar Russ Anderson Committed by Tony Luck
Browse files

[IA64] MCA recovery: kernel context recovery table 



Memory errors encountered by user applications may surface
when the CPU is running in kernel context.  The current code
will not attempt recovery if the MCA surfaces in kernel
context (privilage mode 0).  This patch adds a check for cases
where the user initiated the load that surfaces in kernel
interrupt code.

An example is a user process lauching a load from memory
and the data in memory had bad ECC.  Before the bad data
gets to the CPU register, and interrupt comes in.  The
code jumps to the IVT interrupt entry point and begins
execution in kernel context.  The process of saving the
user registers (SAVE_REST) causes the bad data to be loaded
into a CPU register, triggering the MCA.  The MCA surfaces in
kernel context, even though the load was initiated from
user context.

As suggested by David and Tony, this patch uses an exception
table like approach, puting the tagged recovery addresses in
a searchable table.  One difference from the exception table
is that MCAs do not surface in precise places (such as with
a TLB miss), so instead of tagging specific instructions,
address ranges are registers.  A single macro is used to do
the tagging, with the input parameter being the label
of the starting address and the macro being the ending
address.  This limits clutter in the code.

This patch only tags one spot, the interrupt ivt entry.
Testing showed that spot to be a "heavy hitter" with
MCAs surfacing while saving user registers.  Other spots
can be added as needed by adding a single macro.

Signed-off-by: default avatarRuss Anderson <(rja@sgi.com)>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent a5b00bb4

arch/ia64/kernel/ivt.S

+1 −0
Original line number Diff line number Diff line
@@ -865,6 +865,7 @@ ENTRY(interrupt) 
	;;

	SAVE_REST

	;;

	MCA_RECOVER_RANGE(interrupt)

	alloc r14=ar.pfs,0,0,2,0 // must be first in an insn group

	mov out0=cr.ivr		// pass cr.ivr as first arg

	add out1=16,sp		// pass pointer to pt_regs as second arg

arch/ia64/kernel/mca.c

+73 −25
Original line number Diff line number Diff line
@@ -83,6 +83,7 @@ 
#include <asm/irq.h>

#include <asm/hw_irq.h>



#include "mca_drv.h"

#include "entry.h"



#if defined(IA64_MCA_DEBUG_INFO)
@@ -281,6 +282,50 @@ ia64_mca_log_sal_error_record(int sal_info_type) 
		ia64_sal_clear_state_info(sal_info_type);

}



/*

 * search_mca_table

 *  See if the MCA surfaced in an instruction range

 *  that has been tagged as recoverable.

 *

 *  Inputs

 *	first	First address range to check

 *	last	Last address range to check

 *	ip	Instruction pointer, address we are looking for

 *

 * Return value:

 *      1 on Success (in the table)/ 0 on Failure (not in the  table)

 */

int

search_mca_table (const struct mca_table_entry *first,

                const struct mca_table_entry *last,

                unsigned long ip)

{

        const struct mca_table_entry *curr;

        u64 curr_start, curr_end;



        curr = first;

        while (curr <= last) {

                curr_start = (u64) &curr->start_addr + curr->start_addr;

                curr_end = (u64) &curr->end_addr + curr->end_addr;



                if ((ip >= curr_start) && (ip <= curr_end)) {

                        return 1;

                }

                curr++;

        }

        return 0;

}



/* Given an address, look for it in the mca tables. */

int mca_recover_range(unsigned long addr)

{

	extern struct mca_table_entry __start___mca_table[];

	extern struct mca_table_entry __stop___mca_table[];



	return search_mca_table(__start___mca_table, __stop___mca_table-1, addr);

}

EXPORT_SYMBOL_GPL(mca_recover_range);



#ifdef CONFIG_ACPI



int cpe_vector = -1;
@@ -747,6 +792,8 @@ ia64_mca_modify_original_stack(struct pt_regs *regs, 
		ia64_mca_modify_comm(previous_current);

		goto no_mod;

	}



	if (!mca_recover_range(ms->pmsa_iip)) {

		if (r13 != sos->prev_IA64_KR_CURRENT) {

			msg = "inconsistent previous current and r13";

			goto no_mod;
@@ -773,6 +820,7 @@ ia64_mca_modify_original_stack(struct pt_regs *regs, 
			msg = "no room for blocked state";

			goto no_mod;

		}

	}



	ia64_mca_modify_comm(previous_current);

arch/ia64/kernel/mca_drv.c

+15 −7
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
 * Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com)

 * Copyright (C) 2005 Silicon Graphics, Inc

 * Copyright (C) 2005 Keith Owens <kaos@sgi.com>

 * Copyright (C) 2006 Russ Anderson <rja@sgi.com>

 */

#include <linux/config.h>

#include <linux/types.h>
@@ -121,11 +122,12 @@ mca_page_isolate(unsigned long paddr) 
 */



void

mca_handler_bh(unsigned long paddr)

mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr)

{

	printk(KERN_ERR

		"OS_MCA: process [pid: %d](%s) encounters MCA (paddr=%lx)\n",

		current->pid, current->comm, paddr);

	printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, "

		"iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n",

		raw_smp_processor_id(), current->pid, current->uid,

		iip, ipsr, paddr, current->comm);



	spin_lock(&mca_bh_lock);

	switch (mca_page_isolate(paddr)) {
@@ -442,21 +444,26 @@ recover_from_read_error(slidx_table_t *slidx, 
	if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate))

		return 0;

	psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr);

	psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr);



	/*

	 *  Check the privilege level of interrupted context.

	 *   If it is user-mode, then terminate affected process.

	 */

	if (psr1->cpl != 0) {



	pmsa = sos->pal_min_state;

	if (psr1->cpl != 0 ||

	   ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) {

		smei = peidx_bus_check(peidx, 0);

		if (smei->valid.target_identifier) {

			/*

			 *  setup for resume to bottom half of MCA,

			 * "mca_handler_bhhook"

			 */

			pmsa = sos->pal_min_state;

			/* pass to bhhook as 1st argument (gr8) */

			/* pass to bhhook as argument (gr8, ...) */

			pmsa->pmsa_gr[8-1] = smei->target_identifier;

			pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip;

			pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr;

			/* set interrupted return address (but no use) */

			pmsa->pmsa_br0 = pmsa->pmsa_iip;

			/* change resume address to bottom half */
@@ -466,6 +473,7 @@ recover_from_read_error(slidx_table_t *slidx, 
			psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr;

			psr2->cpl = 0;

			psr2->ri  = 0;

			psr2->bn  = 1;

			psr2->i  = 0;



			return 1;

arch/ia64/kernel/mca_drv.h

+7 −0
Original line number Diff line number Diff line
@@ -111,3 +111,10 @@ typedef struct slidx_table { 
	slidx_foreach_entry(__pos, &((slidx)->sec)) { __count++; }\

	__count; })



struct mca_table_entry {

	int start_addr;	/* location-relative starting address of MCA recoverable range */

	int end_addr;	/* location-relative ending address of MCA recoverable range */

};



extern const struct mca_table_entry *search_mca_tables (unsigned long addr);

extern int mca_recover_range(unsigned long);

arch/ia64/kernel/mca_drv_asm.S

+4 −9
Original line number Diff line number Diff line
@@ -14,15 +14,12 @@ 


GLOBAL_ENTRY(mca_handler_bhhook)

	invala				// clear RSE ?

	;;

	cover

	;;

	clrrrb

	;;						

	alloc	r16=ar.pfs,0,2,1,0	// make a new frame

	;;

	alloc	r16=ar.pfs,0,2,3,0	// make a new frame

	mov	ar.rsc=0

	;;

	mov	r13=IA64_KR(CURRENT)	// current task pointer

	;;

	mov	r2=r13
@@ -30,7 +27,6 @@ GLOBAL_ENTRY(mca_handler_bhhook) 
	addl	r22=IA64_RBS_OFFSET,r2

	;;

	mov	ar.bspstore=r22

	;;

	addl	sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2

	;;

	adds	r2=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13
@@ -40,12 +36,12 @@ GLOBAL_ENTRY(mca_handler_bhhook) 
	movl	loc1=mca_handler_bh	// recovery C function

	;;

	mov	out0=r8			// poisoned address

	mov	out1=r9			// iip

	mov	out2=r10		// psr

	mov	b6=loc1

	;;

	mov	loc1=rp

	;;

	ssm	psr.i

	;;

	ssm	psr.i | psr.ic

	br.call.sptk.many rp=b6		// does not return ...

	;;

	mov	ar.pfs=loc0
@@ -53,5 +49,4 @@ GLOBAL_ENTRY(mca_handler_bhhook) 
	;;

	mov	r8=r0

	br.ret.sptk.many rp

	;;

END(mca_handler_bhhook)

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