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