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
10static 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
47int 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
99void 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