huberror.c 6.14 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1
2
3
4
5
/*
 * 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.
 *
6
 * Copyright (C) 1992 - 1997, 2000,2002-2007 Silicon Graphics, Inc. All rights reserved.
Linus Torvalds's avatar
Linus Torvalds committed
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 */

#include <linux/types.h>
#include <linux/interrupt.h>
#include <asm/delay.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>

void hubiio_crb_error_handler(struct hubdev_info *hubdev_info);
extern void bte_crb_error_handler(cnodeid_t, int, int, ioerror_t *,
				  int);
Al Viro's avatar
Al Viro committed
24
static irqreturn_t hub_eint_handler(int irq, void *arg)
Linus Torvalds's avatar
Linus Torvalds committed
25
26
27
28
29
30
31
32
33
{
	struct hubdev_info *hubdev_info;
	struct ia64_sal_retval ret_stuff;
	nasid_t nasid;

	ret_stuff.status = 0;
	ret_stuff.v0 = 0;
	hubdev_info = (struct hubdev_info *)arg;
	nasid = hubdev_info->hdi_nasid;
34
35
36

	if (is_shub1()) {
		SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
Linus Torvalds's avatar
Linus Torvalds committed
37
38
			(u64) nasid, 0, 0, 0, 0, 0, 0);

39
		if ((int)ret_stuff.v0)
40
41
			panic("%s: Fatal %s Error", __FUNCTION__,
				((nasid & 1) ? "TIO" : "HUBII"));
Linus Torvalds's avatar
Linus Torvalds committed
42

43
44
		if (!(nasid & 1)) /* Not a TIO, handle CRB errors */
			(void)hubiio_crb_error_handler(hubdev_info);
45
46
47
48
49
50
51
52
53
	} else
		if (nasid & 1) {	/* TIO errors */
			SAL_CALL_NOLOCK(ret_stuff, SN_SAL_HUB_ERROR_INTERRUPT,
				(u64) nasid, 0, 0, 0, 0, 0, 0);

			if ((int)ret_stuff.v0)
				panic("%s: Fatal TIO Error", __FUNCTION__);
		} else
			bte_error_handler((unsigned long)NODEPDA(nasid_to_cnodeid(nasid)));
Linus Torvalds's avatar
Linus Torvalds committed
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86

	return IRQ_HANDLED;
}

/*
 * Free the hub CRB "crbnum" which encountered an error.
 * Assumption is, error handling was successfully done,
 * and we now want to return the CRB back to Hub for normal usage.
 *
 * In order to free the CRB, all that's needed is to de-allocate it
 *
 * Assumption:
 *      No other processor is mucking around with the hub control register.
 *      So, upper layer has to single thread this.
 */
void hubiio_crb_free(struct hubdev_info *hubdev_info, int crbnum)
{
	ii_icrb0_b_u_t icrbb;

	/*
	 * The hardware does NOT clear the mark bit, so it must get cleared
	 * here to be sure the error is not processed twice.
	 */
	icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(hubdev_info->hdi_nasid,
					       IIO_ICRB_B(crbnum));
	icrbb.b_mark = 0;
	REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICRB_B(crbnum),
		     icrbb.ii_icrb0_b_regval);
	/*
	 * Deallocate the register wait till hub indicates it's done.
	 */
	REMOTE_HUB_S(hubdev_info->hdi_nasid, IIO_ICDR, (IIO_ICDR_PND | crbnum));
	while (REMOTE_HUB_L(hubdev_info->hdi_nasid, IIO_ICDR) & IIO_ICDR_PND)
87
		cpu_relax();
Linus Torvalds's avatar
Linus Torvalds committed
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187

}

/*
 * hubiio_crb_error_handler
 *
 *	This routine gets invoked when a hub gets an error 
 *	interrupt. So, the routine is running in interrupt context
 *	at error interrupt level.
 * Action:
 *	It's responsible for identifying ALL the CRBs that are marked
 *	with error, and process them. 
 *	
 * 	If you find the CRB that's marked with error, map this to the
 *	reason it caused error, and invoke appropriate error handler.
 *
 *	XXX Be aware of the information in the context register.
 *
 * NOTE:
 *	Use REMOTE_HUB_* macro instead of LOCAL_HUB_* so that the interrupt
 *	handler can be run on any node. (not necessarily the node 
 *	corresponding to the hub that encountered error).
 */

void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
{
	nasid_t nasid;
	ii_icrb0_a_u_t icrba;	/* II CRB Register A */
	ii_icrb0_b_u_t icrbb;	/* II CRB Register B */
	ii_icrb0_c_u_t icrbc;	/* II CRB Register C */
	ii_icrb0_d_u_t icrbd;	/* II CRB Register D */
	ii_icrb0_e_u_t icrbe;	/* II CRB Register D */
	int i;
	int num_errors = 0;	/* Num of errors handled */
	ioerror_t ioerror;

	nasid = hubdev_info->hdi_nasid;

	/*
	 * XXX - Add locking for any recovery actions
	 */
	/*
	 * Scan through all CRBs in the Hub, and handle the errors
	 * in any of the CRBs marked.
	 */
	for (i = 0; i < IIO_NUM_CRBS; i++) {
		/* Check this crb entry to see if it is in error. */
		icrbb.ii_icrb0_b_regval = REMOTE_HUB_L(nasid, IIO_ICRB_B(i));

		if (icrbb.b_mark == 0) {
			continue;
		}

		icrba.ii_icrb0_a_regval = REMOTE_HUB_L(nasid, IIO_ICRB_A(i));

		IOERROR_INIT(&ioerror);

		/* read other CRB error registers. */
		icrbc.ii_icrb0_c_regval = REMOTE_HUB_L(nasid, IIO_ICRB_C(i));
		icrbd.ii_icrb0_d_regval = REMOTE_HUB_L(nasid, IIO_ICRB_D(i));
		icrbe.ii_icrb0_e_regval = REMOTE_HUB_L(nasid, IIO_ICRB_E(i));

		IOERROR_SETVALUE(&ioerror, errortype, icrbb.b_ecode);

		/* Check if this error is due to BTE operation,
		 * and handle it separately.
		 */
		if (icrbd.d_bteop ||
		    ((icrbb.b_initiator == IIO_ICRB_INIT_BTE0 ||
		      icrbb.b_initiator == IIO_ICRB_INIT_BTE1) &&
		     (icrbb.b_imsgtype == IIO_ICRB_IMSGT_BTE ||
		      icrbb.b_imsgtype == IIO_ICRB_IMSGT_SN1NET))) {

			int bte_num;

			if (icrbd.d_bteop)
				bte_num = icrbc.c_btenum;
			else	/* b_initiator bit 2 gives BTE number */
				bte_num = (icrbb.b_initiator & 0x4) >> 2;

			hubiio_crb_free(hubdev_info, i);

			bte_crb_error_handler(nasid_to_cnodeid(nasid), bte_num,
					      i, &ioerror, icrbd.d_bteop);
			num_errors++;
			continue;
		}
	}
}

/*
 * Function	: hub_error_init
 * Purpose	: initialize the error handling requirements for a given hub.
 * Parameters	: cnode, the compact nodeid.
 * Assumptions	: Called only once per hub, either by a local cpu. Or by a
 *			remote cpu, when this hub is headless.(cpuless)
 * Returns	: None
 */
void hub_error_init(struct hubdev_info *hubdev_info)
{
Al Viro's avatar
Al Viro committed
188
	if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
Linus Torvalds's avatar
Linus Torvalds committed
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
			"SN_hub_error", (void *)hubdev_info))
		printk("hub_error_init: Failed to request_irq for 0x%p\n",
		    hubdev_info);
	return;
}


/*
 * Function	: ice_error_init
 * Purpose	: initialize the error handling requirements for a given tio.
 * Parameters	: cnode, the compact nodeid.
 * Assumptions	: Called only once per tio.
 * Returns	: None
 */
void ice_error_init(struct hubdev_info *hubdev_info)
{
        if (request_irq
206
            (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
Linus Torvalds's avatar
Linus Torvalds committed
207
208
209
210
211
212
             (void *)hubdev_info))
                printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
                       hubdev_info);
        return;
}