1 /*
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
4 * for more details.
5 *
6 * Copyright (C) 1992 - 1997, 2000,2002-2007 Silicon Graphics, Inc. All rights reserved.
7 */
8
9 #include <linux/types.h>
10 #include <linux/interrupt.h>
11 #include <asm/delay.h>
12 #include <asm/sn/sn_sal.h>
13 #include "ioerror.h"
14 #include <asm/sn/addrs.h>
15 #include <asm/sn/shubio.h>
16 #include <asm/sn/geo.h>
17 #include "xtalk/xwidgetdev.h"
18 #include "xtalk/hubdev.h"
19 #include <asm/sn/bte.h>
20
21 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
22 extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
23 int);
hub_eint_handler(int irq,void * arg)24 static irqreturn_t hub_eint_handler(int irq, void *arg)
25 {
26 struct hubdev_info *hubdev_info;
27 struct ia64_sal_retval ret_stuff;
28 nasid_t nasid;
29
30 ret_stuff.status = 0;
31 ret_stuff.v0 = 0;
32 hubdev_info = (struct hubdev_info *)arg;
33 nasid = hubdev_info->hdi_nasid;
34
35 if (is_shub1()) {
36 SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
37 (u64) nasid, 0, 0, 0, 0, 0, 0);
38
39 if ((int)ret_stuff.v0)
40 panic("%s: Fatal %s Error", __func__,
41 ((nasid & 1) ? "TIO" : "HUBII"));
42
43 if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
44 (void)hubiio_crb_error_handler(hubdev_info);
45 } else
46 if (nasid & 1) { /* TIO errors */
47 SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
48 (u64) nasid, 0, 0, 0, 0, 0, 0);
49
50 if ((int)ret_stuff.v0)
51 panic("%s: Fatal TIO Error", __func__);
52 } else
53 bte_error_handler(NODEPDA(nasid_to_cnodeid(nasid)));
54
55 return IRQ_HANDLED;
56 }
57
58 /*
59 * Free the hub CRB "crbnum" which encountered an error.
60 * Assumption is, error handling was successfully done,
61 * and we now want to return the CRB back to Hub for normal usage.
62 *
63 * In order to free the CRB, all that's needed is to de-allocate it
64 *
65 * Assumption:
66 * No other processor is mucking around with the hub control register.
67 * So, upper layer has to single thread this.
68 */
hubiio_crb_free(struct hubdev_info * hubdev_info,int crbnum)69 void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
70 {
71 ii_icrb0_b_u_t icrbb;
72
73 /*
74 * The hardware does NOT clear the mark bit, so it must get cleared
75 * here to be sure the error is not processed twice.
76 */
77 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
78 IIO_ICRB_B(crbnum));
79 icrbb.b_mark = 0;
80 REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
81 icrbb.ii_icrb0_b_regval);
82 /*
83 * Deallocate the register wait till hub indicates it's done.
84 */
85 REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
86 while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
87 cpu_relax();
88
89 }
90
91 /*
92 * hubiio_crb_error_handler
93 *
94 * This routine gets invoked when a hub gets an error
95 * interrupt. So, the routine is running in interrupt context
96 * at error interrupt level.
97 * Action:
98 * It's responsible for identifying ALL the CRBs that are marked
99 * with error, and process them.
100 *
101 * If you find the CRB that's marked with error, map this to the
102 * reason it caused error, and invoke appropriate error handler.
103 *
104 * XXX Be aware of the information in the context register.
105 *
106 * NOTE:
107 * Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
108 * handler can be run on any node. (not necessarily the node
109 * corresponding to the hub that encountered error).
110 */
111
hubiio_crb_error_handler(struct hubdev_info * hubdev_info)112 void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
113 {
114 nasid_t nasid;
115 ii_icrb0_a_u_t icrba; /* II CRB Register A */
116 ii_icrb0_b_u_t icrbb; /* II CRB Register B */
117 ii_icrb0_c_u_t icrbc; /* II CRB Register C */
118 ii_icrb0_d_u_t icrbd; /* II CRB Register D */
119 ii_icrb0_e_u_t icrbe; /* II CRB Register D */
120 int i;
121 int num_errors = 0; /* Num of errors handled */
122 ioerror_t ioerror;
123
124 nasid = hubdev_info->hdi_nasid;
125
126 /*
127 * XXX - Add locking for any recovery actions
128 */
129 /*
130 * Scan through all CRBs in the Hub, and handle the errors
131 * in any of the CRBs marked.
132 */
133 for (i = 0; i < IIO_NUM_CRBS; i++) {
134 /* Check this crb entry to see if it is in error. */
135 icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));
136
137 if (icrbb.b_mark == 0) {
138 continue;
139 }
140
141 icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));
142
143 IOERROR_INIT(&ioerror);
144
145 /* read other CRB error registers. */
146 icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
147 icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
148 icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));
149
150 IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);
151
152 /* Check if this error is due to BTE operation,
153 * and handle it separately.
154 */
155 if (icrbd.d_bteop ||
156 ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
157 icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
158 (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
159 icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {
160
161 int bte_num;
162
163 if (icrbd.d_bteop)
164 bte_num = icrbc.c_btenum;
165 else /* b_initiator bit 2 gives BTE number */
166 bte_num = (icrbb.b_initiator & 0x4) >> 2;
167
168 hubiio_crb_free(hubdev_info, i);
169
170 bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
171 i, &ioerror, icrbd.d_bteop);
172 num_errors++;
173 continue;
174 }
175 }
176 }
177
178 /*
179 * Function : hub_error_init
180 * Purpose : initialize the error handling requirements for a given hub.
181 * Parameters : cnode, the compact nodeid.
182 * Assumptions : Called only once per hub, either by a local cpu. Or by a
183 * remote cpu, when this hub is headless.(cpuless)
184 * Returns : None
185 */
hub_error_init(struct hubdev_info * hubdev_info)186 void hub_error_init(struct hubdev_info *hubdev_info)
187 {
188
189 if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
190 "SN_hub_error", hubdev_info)) {
191 printk(KERN_ERR "hub_error_init: Failed to request_irq for 0x%p\n",
192 hubdev_info);
193 return;
194 }
195 irq_set_handler(SGI_II_ERROR, handle_level_irq);
196 sn_set_err_irq_affinity(SGI_II_ERROR);
197 }
198
199
200 /*
201 * Function : ice_error_init
202 * Purpose : initialize the error handling requirements for a given tio.
203 * Parameters : cnode, the compact nodeid.
204 * Assumptions : Called only once per tio.
205 * Returns : None
206 */
ice_error_init(struct hubdev_info * hubdev_info)207 void ice_error_init(struct hubdev_info *hubdev_info)
208 {
209
210 if (request_irq
211 (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
212 (void *)hubdev_info)) {
213 printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
214 hubdev_info);
215 return;
216 }
217 irq_set_handler(SGI_TIO_ERROR, handle_level_irq);
218 sn_set_err_irq_affinity(SGI_TIO_ERROR);
219 }
220
221
