Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 396e8e76 authored by Russ Anderson's avatar Russ Anderson Committed by Tony Luck
Browse files

[IA64] Cache error recovery 



Similar to memory error recovery, when a cache error is consumed
by a user process terminate the user instead of crashing the system.

Signed-off-by: default avatarRuss Anderson <(rja@sgi.com)>
Acked-by: default avatarHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 618b206f

arch/ia64/kernel/mca_drv.c

+11 −21
Original line number Diff line number Diff line
@@ -602,6 +602,8 @@ recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, 
		default:

			break;

		}

	} else if (psp->cc && !psp->bc) {	/* Cache error */

		status = recover_from_read_error(slidx, peidx, pbci, sos);

	}



	return status;
@@ -645,13 +647,6 @@ recover_from_tlb_check(peidx_table_t *peidx) 
 * Return value:

 *	1 on Success / 0 on Failure

 */

/*

 *  Later we try to recover when below all conditions are satisfied.

 *   1. Only one processor error section is exist.

 *   2. BUS_CHECK is exist and the others are not exist.(Except TLB_CHECK)

 *   3. The entry of BUS_CHECK_INFO is 1.

 *   4. "External bus error" flag is set and the others are not set.

 */



static int

recover_from_processor_error(int platform, slidx_table_t *slidx,
@@ -687,36 +682,31 @@ recover_from_processor_error(int platform, slidx_table_t *slidx, 
	/*

	 * The cache check and bus check bits have four possible states

	 *   cc bc

	 *    0  0	Weird record, not recovered

	 *    1  0	Cache error, not recovered

	 *    0  1	I/O error, attempt recovery

	 *    1  1	Memory error, attempt recovery

	 *    1  0	Cache error, attempt recovery

	 *    0  1	I/O error, attempt recovery

	 *    0  0	Other error type, not recovered

	 */

	if (psp->bc == 0 || pbci == NULL)

		return fatal_mca("No bus check");

	if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL))

		return fatal_mca("No cache or bus check");



	/*

	 * Sorry, we cannot handle so many.

	 * Cannot handle more than one bus check.

	 */

	if (peidx_bus_check_num(peidx) > 1)

		return fatal_mca("Too many bus checks");

	/*

	 * Well, here is only one bus error.

	 */



	if (pbci->ib)

		return fatal_mca("Internal Bus error");

	if (pbci->cc)

		return fatal_mca("Cache-cache error");

	if (pbci->eb && pbci->bsi > 0)

		return fatal_mca("External bus check fatal status");



	/*

	 * This is a local MCA and estimated as recoverble external bus error.

	 * (e.g. a load from poisoned memory)

	 * This means "there are some platform errors".

	 * This is a local MCA and estimated as a recoverble error.

	 */

	if (platform)

		return recover_from_platform_error(slidx, peidx, pbci, sos);



	/*

	 * On account of strange SAL error record, we cannot recover.

	 */