1 // SPDX-License-Identifier: ISC
2 /*
3 * Copyright (c) 2015,2017 Qualcomm Atheros, Inc.
4 * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
5 */
6
7 #include "wil6210.h"
8 #include <linux/devcoredump.h>
9
wil_fw_get_crash_dump_bounds(struct wil6210_priv * wil,u32 * out_dump_size,u32 * out_host_min)10 static int wil_fw_get_crash_dump_bounds(struct wil6210_priv *wil,
11 u32 *out_dump_size, u32 *out_host_min)
12 {
13 int i;
14 const struct fw_map *map;
15 u32 host_min, host_max, tmp_max;
16
17 if (!out_dump_size)
18 return -EINVAL;
19
20 /* calculate the total size of the unpacked crash dump */
21 BUILD_BUG_ON(ARRAY_SIZE(fw_mapping) == 0);
22 map = &fw_mapping[0];
23 host_min = map->host;
24 host_max = map->host + (map->to - map->from);
25
26 for (i = 1; i < ARRAY_SIZE(fw_mapping); i++) {
27 map = &fw_mapping[i];
28
29 if (!map->crash_dump)
30 continue;
31
32 if (map->host < host_min)
33 host_min = map->host;
34
35 tmp_max = map->host + (map->to - map->from);
36 if (tmp_max > host_max)
37 host_max = tmp_max;
38 }
39
40 *out_dump_size = host_max - host_min;
41 if (out_host_min)
42 *out_host_min = host_min;
43
44 return 0;
45 }
46
wil_fw_copy_crash_dump(struct wil6210_priv * wil,void * dest,u32 size)47 int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size)
48 {
49 int i;
50 const struct fw_map *map;
51 void *data;
52 u32 host_min, dump_size, offset, len;
53
54 if (wil_fw_get_crash_dump_bounds(wil, &dump_size, &host_min)) {
55 wil_err(wil, "fail to obtain crash dump size\n");
56 return -EINVAL;
57 }
58
59 if (dump_size > size) {
60 wil_err(wil, "not enough space for dump. Need %d have %d\n",
61 dump_size, size);
62 return -EINVAL;
63 }
64
65 down_write(&wil->mem_lock);
66
67 if (test_bit(wil_status_suspending, wil->status) ||
68 test_bit(wil_status_suspended, wil->status)) {
69 wil_err(wil,
70 "suspend/resume in progress. cannot copy crash dump\n");
71 up_write(&wil->mem_lock);
72 return -EBUSY;
73 }
74
75 /* copy to crash dump area */
76 for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) {
77 map = &fw_mapping[i];
78
79 if (!map->crash_dump)
80 continue;
81
82 data = (void * __force)wil->csr + HOSTADDR(map->host);
83 len = map->to - map->from;
84 offset = map->host - host_min;
85
86 wil_dbg_misc(wil,
87 "fw_copy_crash_dump: - dump %s, size %d, offset %d\n",
88 fw_mapping[i].name, len, offset);
89
90 wil_memcpy_fromio_32((void * __force)(dest + offset),
91 (const void __iomem * __force)data, len);
92 }
93
94 up_write(&wil->mem_lock);
95
96 return 0;
97 }
98
wil_fw_core_dump(struct wil6210_priv * wil)99 void wil_fw_core_dump(struct wil6210_priv *wil)
100 {
101 void *fw_dump_data;
102 u32 fw_dump_size;
103
104 if (wil_fw_get_crash_dump_bounds(wil, &fw_dump_size, NULL)) {
105 wil_err(wil, "fail to get fw dump size\n");
106 return;
107 }
108
109 fw_dump_data = vzalloc(fw_dump_size);
110 if (!fw_dump_data)
111 return;
112
113 if (wil_fw_copy_crash_dump(wil, fw_dump_data, fw_dump_size)) {
114 vfree(fw_dump_data);
115 return;
116 }
117 /* fw_dump_data will be free in device coredump release function
118 * after 5 min
119 */
120 dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size, GFP_KERNEL);
121 wil_info(wil, "fw core dumped, size %d bytes\n", fw_dump_size);
122 }
123