2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1992 - 1997, 2000,2002-2005 Silicon Graphics, Inc. All rights reserved.
9 #include <linux/types.h>
10 #include <linux/interrupt.h>
11 #include <linux/pci.h>
12 #include <asm/delay.h>
13 #include <asm/sn/sn_sal.h>
15 #include <asm/sn/addrs.h>
16 #include <asm/sn/shubio.h>
17 #include <asm/sn/geo.h>
18 #include "xtalk/xwidgetdev.h"
19 #include "xtalk/hubdev.h"
20 #include <asm/sn/bte.h>
22 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
23 extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
25 static irqreturn_t hub_eint_handler(int irq, void *arg)
27 struct hubdev_info *hubdev_info;
28 struct ia64_sal_retval ret_stuff;
33 hubdev_info = (struct hubdev_info *)arg;
34 nasid = hubdev_info->hdi_nasid;
37 SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
38 (u64) nasid, 0, 0, 0, 0, 0, 0);
40 if ((int)ret_stuff.v0)
41 panic("hubii_eint_handler(): Fatal TIO Error");
43 if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
44 (void)hubiio_crb_error_handler(hubdev_info);
46 bte_error_handler((unsigned long)NODEPDA(nasid_to_cnodeid(nasid)));
52 * Free the hub CRB "crbnum" which encountered an error.
53 * Assumption is, error handling was successfully done,
54 * and we now want to return the CRB back to Hub for normal usage.
56 * In order to free the CRB, all that's needed is to de-allocate it
59 * No other processor is mucking around with the hub control register.
60 * So, upper layer has to single thread this.
62 void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
67 * The hardware does NOT clear the mark bit, so it must get cleared
68 * here to be sure the error is not processed twice.
70 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
73 REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
74 icrbb.ii_icrb0_b_regval);
76 * Deallocate the register wait till hub indicates it's done.
78 REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
79 while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
85 * hubiio_crb_error_handler
87 * This routine gets invoked when a hub gets an error
88 * interrupt. So, the routine is running in interrupt context
89 * at error interrupt level.
91 * It's responsible for identifying ALL the CRBs that are marked
92 * with error, and process them.
94 * If you find the CRB that's marked with error, map this to the
95 * reason it caused error, and invoke appropriate error handler.
97 * XXX Be aware of the information in the context register.
100 * Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
101 * handler can be run on any node. (not necessarily the node
102 * corresponding to the hub that encountered error).
105 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
108 ii_icrb0_a_u_t icrba; /* II CRB Register A */
109 ii_icrb0_b_u_t icrbb; /* II CRB Register B */
110 ii_icrb0_c_u_t icrbc; /* II CRB Register C */
111 ii_icrb0_d_u_t icrbd; /* II CRB Register D */
112 ii_icrb0_e_u_t icrbe; /* II CRB Register D */
114 int num_errors = 0; /* Num of errors handled */
117 nasid = hubdev_info->hdi_nasid;
120 * XXX - Add locking for any recovery actions
123 * Scan through all CRBs in the Hub, and handle the errors
124 * in any of the CRBs marked.
126 for (i = 0; i < IIO_NUM_CRBS; i++) {
127 /* Check this crb entry to see if it is in error. */
128 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
130 if (icrbb.b_mark == 0) {
134 icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
136 IOERROR_INIT(&ioerror);
138 /* read other CRB error registers. */
139 icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
140 icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
141 icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
143 IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
145 /* Check if this error is due to BTE operation,
146 * and handle it separately.
149 ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
150 icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
151 (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
152 icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
157 bte_num = icrbc.c_btenum;
158 else /* b_initiator bit 2 gives BTE number */
159 bte_num = (icrbb.b_initiator & 0x4) >> 2;
161 hubiio_crb_free(hubdev_info, i);
163 bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
164 i, &ioerror, icrbd.d_bteop);
172 * Function : hub_error_init
173 * Purpose : initialize the error handling requirements for a given hub.
174 * Parameters : cnode, the compact nodeid.
175 * Assumptions : Called only once per hub, either by a local cpu. Or by a
176 * remote cpu, when this hub is headless.(cpuless)
179 void hub_error_init(struct hubdev_info *hubdev_info)
181 if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
182 "SN_hub_error", (void *)hubdev_info))
183 printk("hub_error_init: Failed to request_irq for 0x%p\n",
190 * Function : ice_error_init
191 * Purpose : initialize the error handling requirements for a given tio.
192 * Parameters : cnode, the compact nodeid.
193 * Assumptions : Called only once per tio.
196 void ice_error_init(struct hubdev_info *hubdev_info)
199 (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
200 (void *)hubdev_info))
201 printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",