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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (c) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
*/
#include <linux/types.h>
#include <asm/sn/sn_sal.h>
#include "ioerror.h"
#include <asm/sn/addrs.h>
#include <asm/sn/shubio.h>
#include <asm/sn/geo.h>
#include "xtalk/xwidgetdev.h"
#include "xtalk/hubdev.h"
#include <asm/sn/bte.h>
#include <asm/param.h>
/*
* Bte error handling is done in two parts. The first captures
* any crb related errors. Since there can be multiple crbs per
* interface and multiple interfaces active, we need to wait until
* all active crbs are completed. This is the first job of the
* second part error handler. When all bte related CRBs are cleanly
* completed, it resets the interfaces and gets them ready for new
* transfers to be queued.
*/
/*
* Wait until all BTE related CRBs are completed
* and then reset the interfaces.
*/
static int shub1_bte_error_handler(struct nodepda_s *err_nodepda)
{
struct timer_list *recovery_timer = &err_nodepda->bte_recovery_timer;
nasid_t nasid;
int i;
int valid_crbs;
ii_imem_u_t imem; /* II IMEM Register */
ii_icrb0_d_u_t icrbd; /* II CRB Register D */
ii_ibcr_u_t ibcr;
ii_icmr_u_t icmr;
ii_ieclr_u_t ieclr;
BTE_PRINTK(("shub1_bte_error_handler(%p) - %d\n", err_nodepda,
smp_processor_id()));
if ((err_nodepda->bte_if[0].bh_error == BTE_SUCCESS) &&
(err_nodepda->bte_if[1].bh_error == BTE_SUCCESS)) {
BTE_PRINTK(("eh:%p:%d Nothing to do.\n", err_nodepda,
smp_processor_id()));
return 1;
}
/* Determine information about our hub */
nasid = cnodeid_to_nasid(err_nodepda->bte_if[0].bte_cnode);
/*
* A BTE transfer can use multiple CRBs. We need to make sure
* that all the BTE CRBs are complete (or timed out) before
* attempting to clean up the error. Resetting the BTE while
* there are still BTE CRBs active will hang the BTE.
* We should look at all the CRBs to see if they are allocated
* to the BTE and see if they are still active. When none
* are active, we can continue with the cleanup.
*
* We also want to make sure that the local NI port is up.
* When a router resets the NI port can go down, while it
* goes through the LLP handshake, but then comes back up.
*/
icmr.ii_icmr_regval = REMOTE_HUB_L(nasid, IIO_ICMR);
if (icmr.ii_icmr_fld_s.i_crb_mark != 0) {
/*
* There are errors which still need to be cleaned up by
* hubiio_crb_error_handler
*/
mod_timer(recovery_timer, jiffies + (HZ * 5));
BTE_PRINTK(("eh:%p:%d Marked Giving up\n", err_nodepda,
smp_processor_id()));
return 1;
}
if (icmr.ii_icmr_fld_s.i_crb_vld != 0) {
valid_crbs = icmr.ii_icmr_fld_s.i_crb_vld;
for (i = 0; i < IIO_NUM_CRBS; i++) {
if (!((1 << i) & valid_crbs)) {
/* This crb was not marked as valid, ignore */
continue;
}
icrbd.ii_icrb0_d_regval =
REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
if (icrbd.d_bteop) {
mod_timer(recovery_timer, jiffies + (HZ * 5));
BTE_PRINTK(("eh:%p:%d Valid %d, Giving up\n",
err_nodepda, smp_processor_id(),
i));
return 1;
}
}
}
BTE_PRINTK(("eh:%p:%d Cleaning up\n", err_nodepda, smp_processor_id()));
/* Re-enable both bte interfaces */
imem.ii_imem_regval = REMOTE_HUB_L(nasid, IIO_IMEM);
imem.ii_imem_fld_s.i_b0_esd = imem.ii_imem_fld_s.i_b1_esd = 1;
REMOTE_HUB_S(nasid, IIO_IMEM, imem.ii_imem_regval);
/* Clear BTE0/1 error bits */
ieclr.ii_ieclr_regval = 0;
if (err_nodepda->bte_if[0].bh_error != BTE_SUCCESS)
ieclr.ii_ieclr_fld_s.i_e_bte_0 = 1;
if (err_nodepda->bte_if[1].bh_error != BTE_SUCCESS)
ieclr.ii_ieclr_fld_s.i_e_bte_1 = 1;
REMOTE_HUB_S(nasid, IIO_IECLR, ieclr.ii_ieclr_regval);
/* Reinitialize both BTE state machines. */
ibcr.ii_ibcr_regval = REMOTE_HUB_L(nasid, IIO_IBCR);
ibcr.ii_ibcr_fld_s.i_soft_reset = 1;
REMOTE_HUB_S(nasid, IIO_IBCR, ibcr.ii_ibcr_regval);
del_timer(recovery_timer);
return 0;
}
/*
* Wait until all BTE related CRBs are completed
* and then reset the interfaces.
*/
static int shub2_bte_error_handler(struct nodepda_s *err_nodepda)
{
struct timer_list *recovery_timer = &err_nodepda->bte_recovery_timer;
struct bteinfo_s *bte;
nasid_t nasid;
u64 status;
int i;
nasid = cnodeid_to_nasid(err_nodepda->bte_if[0].bte_cnode);
/*
* Verify that all the BTEs are complete
*/
for (i = 0; i < BTES_PER_NODE; i++) {
bte = &err_nodepda->bte_if[i];
status = BTE_LNSTAT_LOAD(bte);
if (status & IBLS_ERROR) {
bte->bh_error = BTE_SHUB2_ERROR(status);
continue;
}
if (!(status & IBLS_BUSY))
continue;
mod_timer(recovery_timer, jiffies + (HZ * 5));
BTE_PRINTK(("eh:%p:%d Marked Giving up\n", err_nodepda,
smp_processor_id()));
return 1;
}
if (ia64_sn_bte_recovery(nasid))
panic("bte_error_handler(): Fatal BTE Error");
del_timer(recovery_timer);
return 0;
}
/*
* Wait until all BTE related CRBs are completed
* and then reset the interfaces.
*/
void bte_error_handler(struct nodepda_s *err_nodepda)
{
spinlock_t *recovery_lock = &err_nodepda->bte_recovery_lock;
int i;
unsigned long irq_flags;
volatile u64 *notify;
bte_result_t bh_error;
BTE_PRINTK(("bte_error_handler(%p) - %d\n", err_nodepda,
smp_processor_id()));
spin_lock_irqsave(recovery_lock, irq_flags);
/*
* Lock all interfaces on this node to prevent new transfers
* from being queued.
*/
for (i = 0; i < BTES_PER_NODE; i++) {
if (err_nodepda->bte_if[i].cleanup_active) {
continue;
}
spin_lock(&err_nodepda->bte_if[i].spinlock);
BTE_PRINTK(("eh:%p:%d locked %d\n", err_nodepda,
smp_processor_id(), i));
err_nodepda->bte_if[i].cleanup_active = 1;
}
if (is_shub1()) {
if (shub1_bte_error_handler(err_nodepda)) {
spin_unlock_irqrestore(recovery_lock, irq_flags);
return;
}
} else {
if (shub2_bte_error_handler(err_nodepda)) {
spin_unlock_irqrestore(recovery_lock, irq_flags);
return;
}
}
for (i = 0; i < BTES_PER_NODE; i++) {
bh_error = err_nodepda->bte_if[i].bh_error;
if (bh_error != BTE_SUCCESS) {
/* There is an error which needs to be notified */
notify = err_nodepda->bte_if[i].most_rcnt_na;
BTE_PRINTK(("cnode %d bte %d error=0x%lx\n",
err_nodepda->bte_if[i].bte_cnode,
err_nodepda->bte_if[i].bte_num,
IBLS_ERROR | (u64) bh_error));
*notify = IBLS_ERROR | bh_error;
err_nodepda->bte_if[i].bh_error = BTE_SUCCESS;
}
err_nodepda->bte_if[i].cleanup_active = 0;
BTE_PRINTK(("eh:%p:%d Unlocked %d\n", err_nodepda,
smp_processor_id(), i));
spin_unlock(&err_nodepda->bte_if[i].spinlock);
}
spin_unlock_irqrestore(recovery_lock, irq_flags);
}
/*
* First part error handler. This is called whenever any error CRB interrupt
* is generated by the II.
*/
void
bte_crb_error_handler(cnodeid_t cnode, int btenum,
int crbnum, ioerror_t * ioe, int bteop)
{
struct bteinfo_s *bte;
bte = &(NODEPDA(cnode)->bte_if[btenum]);
/*
* The caller has already figured out the error type, we save that
* in the bte handle structure for the thread exercising the
* interface to consume.
*/
bte->bh_error = ioe->ie_errortype + BTEFAIL_OFFSET;
bte->bte_error_count++;
BTE_PRINTK(("Got an error on cnode %d bte %d: HW error type 0x%x\n",
bte->bte_cnode, bte->bte_num, ioe->ie_errortype));
bte_error_handler(NODEPDA(cnode));
}
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