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Diffstat (limited to 'arch/ia64/sn/kernel/bte_error.c')
-rw-r--r--arch/ia64/sn/kernel/bte_error.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/bte_error.c b/arch/ia64/sn/kernel/bte_error.c
new file mode 100644
index 000000000000..fd104312c6bd
--- /dev/null
+++ b/arch/ia64/sn/kernel/bte_error.c
@@ -0,0 +1,198 @@
+/*
+ * 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) 2000-2004 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.
+ */
+
+void bte_error_handler(unsigned long);
+
+/*
+ * Wait until all BTE related CRBs are completed
+ * and then reset the interfaces.
+ */
+void bte_error_handler(unsigned long _nodepda)
+{
+ struct nodepda_s *err_nodepda = (struct nodepda_s *)_nodepda;
+ spinlock_t *recovery_lock = &err_nodepda->bte_recovery_lock;
+ struct timer_list *recovery_timer = &err_nodepda->bte_recovery_timer;
+ nasid_t nasid;
+ int i;
+ int valid_crbs;
+ unsigned long irq_flags;
+ volatile u64 *notify;
+ bte_result_t bh_error;
+ 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(("bte_error_handler(%p) - %d\n", err_nodepda,
+ smp_processor_id()));
+
+ spin_lock_irqsave(recovery_lock, irq_flags);
+
+ 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()));
+ spin_unlock_irqrestore(recovery_lock, irq_flags);
+ return;
+ }
+ /*
+ * 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;
+ }
+
+ /* 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, HZ * 5);
+ BTE_PRINTK(("eh:%p:%d Marked Giving up\n", err_nodepda,
+ smp_processor_id()));
+ spin_unlock_irqrestore(recovery_lock, irq_flags);
+ return;
+ }
+ 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, HZ * 5);
+ BTE_PRINTK(("eh:%p:%d Valid %d, Giving up\n",
+ err_nodepda, smp_processor_id(),
+ i));
+ spin_unlock_irqrestore(recovery_lock,
+ irq_flags);
+ return;
+ }
+ }
+ }
+
+ BTE_PRINTK(("eh:%p:%d Cleaning up\n", err_nodepda, smp_processor_id()));
+ /* Reenable 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);
+
+ 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);
+ }
+
+ del_timer(recovery_timer);
+
+ 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 excercising 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((unsigned long) NODEPDA(cnode));
+}
+