1 /*
2 * Copyright © 2013 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24 #include "config.h"
25
26 #include <libudev.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <assert.h>
32 #include <syslog.h>
33 #include "i915_drm.h"
34 #include "intel_l3_parity.h"
35
36 #ifndef I915_L3_PARITY_UEVENT
37 #define I915_L3_PARITY_UEVENT "L3_PARITY_ERROR"
38 #endif
39
l3_uevent_setup(struct l3_parity * par)40 int l3_uevent_setup(struct l3_parity *par)
41 {
42 struct udev *udev;
43 struct udev_monitor *uevent_monitor;
44 fd_set fdset;
45 int fd, ret = -1;
46
47 udev = udev_new();
48 if (!udev) {
49 return -1;
50 }
51
52 uevent_monitor = udev_monitor_new_from_netlink(udev, "udev");
53 if (!uevent_monitor)
54 goto err_out;
55
56 ret = udev_monitor_filter_add_match_subsystem_devtype(uevent_monitor, "drm", "drm_minor");
57 if (ret < 0)
58 goto err_out;
59
60 ret = udev_monitor_enable_receiving(uevent_monitor);
61 if (ret < 0)
62 goto err_out;
63
64 fd = udev_monitor_get_fd(uevent_monitor);
65 FD_ZERO(&fdset);
66 FD_SET(fd, &fdset);
67
68 par->udev = udev;
69 par->fd = fd;
70 par->fdset = fdset;
71 par->uevent_monitor = uevent_monitor;
72 return 0;
73
74 err_out:
75 udev_unref(udev);
76 return ret;
77 }
78
l3_listen(struct l3_parity * par,bool daemon,struct l3_location * loc)79 int l3_listen(struct l3_parity *par, bool daemon, struct l3_location *loc)
80 {
81 struct udev_device *udev_dev;
82 const char *parity_status;
83 char *err_msg;
84 int ret;
85
86 again:
87 ret = select(par->fd + 1, &par->fdset, NULL, NULL, NULL);
88 /* Number of bits set is returned, must be >= 1 */
89 if (ret <= 0) {
90 return ret;
91 }
92
93 assert(FD_ISSET(par->fd, &par->fdset));
94
95 udev_dev = udev_monitor_receive_device(par->uevent_monitor);
96 if (!udev_dev)
97 return -1;
98
99 parity_status = udev_device_get_property_value(udev_dev, I915_L3_PARITY_UEVENT);
100 if (strncmp(parity_status, "1", 1))
101 goto again;
102
103 loc->slice = atoi(udev_device_get_property_value(udev_dev, "SLICE"));
104 loc->row = atoi(udev_device_get_property_value(udev_dev, "ROW"));
105 loc->bank = atoi(udev_device_get_property_value(udev_dev, "BANK"));
106 loc->subbank = atoi(udev_device_get_property_value(udev_dev, "SUBBANK"));
107
108 udev_device_unref(udev_dev);
109
110 assert(asprintf(&err_msg, "Parity error detected on: %d,%d,%d,%d. "
111 "Try to run intel_l3_parity -r %d -b %d -s %d -w %d -d",
112 loc->slice, loc->row, loc->bank, loc->subbank,
113 loc->row, loc->bank, loc->subbank, loc->slice) != -1);
114 if (daemon) {
115 syslog(LOG_INFO, "%s\n", err_msg);
116 goto again;
117 }
118
119 fprintf(stderr, "%s\n", err_msg);
120
121 free(err_msg);
122
123 return 0;
124 }
125