1 /* 2 * Copyright (c) 2015,2017 Qualcomm Atheros, Inc. 3 * Copyright (c) 2018, The Linux Foundation. All rights reserved. 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include "wil6210.h" 19 #include <linux/devcoredump.h> 20 21 static int wil_fw_get_crash_dump_bounds(struct wil6210_priv *wil, 22 u32 *out_dump_size, u32 *out_host_min) 23 { 24 int i; 25 const struct fw_map *map; 26 u32 host_min, host_max, tmp_max; 27 28 if (!out_dump_size) 29 return -EINVAL; 30 31 /* calculate the total size of the unpacked crash dump */ 32 BUILD_BUG_ON(ARRAY_SIZE(fw_mapping) == 0); 33 map = &fw_mapping[0]; 34 host_min = map->host; 35 host_max = map->host + (map->to - map->from); 36 37 for (i = 1; i < ARRAY_SIZE(fw_mapping); i++) { 38 map = &fw_mapping[i]; 39 40 if (!map->crash_dump) 41 continue; 42 43 if (map->host < host_min) 44 host_min = map->host; 45 46 tmp_max = map->host + (map->to - map->from); 47 if (tmp_max > host_max) 48 host_max = tmp_max; 49 } 50 51 *out_dump_size = host_max - host_min; 52 if (out_host_min) 53 *out_host_min = host_min; 54 55 return 0; 56 } 57 58 int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size) 59 { 60 int i; 61 const struct fw_map *map; 62 void *data; 63 u32 host_min, dump_size, offset, len; 64 65 if (wil_fw_get_crash_dump_bounds(wil, &dump_size, &host_min)) { 66 wil_err(wil, "fail to obtain crash dump size\n"); 67 return -EINVAL; 68 } 69 70 if (dump_size > size) { 71 wil_err(wil, "not enough space for dump. Need %d have %d\n", 72 dump_size, size); 73 return -EINVAL; 74 } 75 76 set_bit(wil_status_collecting_dumps, wil->status); 77 if (test_bit(wil_status_suspending, wil->status) || 78 test_bit(wil_status_suspended, wil->status) || 79 test_bit(wil_status_resetting, wil->status)) { 80 wil_err(wil, "cannot collect fw dump during suspend/reset\n"); 81 clear_bit(wil_status_collecting_dumps, wil->status); 82 return -EINVAL; 83 } 84 85 /* copy to crash dump area */ 86 for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) { 87 map = &fw_mapping[i]; 88 89 if (!map->crash_dump) 90 continue; 91 92 data = (void * __force)wil->csr + HOSTADDR(map->host); 93 len = map->to - map->from; 94 offset = map->host - host_min; 95 96 wil_dbg_misc(wil, 97 "fw_copy_crash_dump: - dump %s, size %d, offset %d\n", 98 fw_mapping[i].name, len, offset); 99 100 wil_memcpy_fromio_32((void * __force)(dest + offset), 101 (const void __iomem * __force)data, len); 102 } 103 104 clear_bit(wil_status_collecting_dumps, wil->status); 105 106 return 0; 107 } 108 109 void wil_fw_core_dump(struct wil6210_priv *wil) 110 { 111 void *fw_dump_data; 112 u32 fw_dump_size; 113 114 if (wil_fw_get_crash_dump_bounds(wil, &fw_dump_size, NULL)) { 115 wil_err(wil, "fail to get fw dump size\n"); 116 return; 117 } 118 119 fw_dump_data = vzalloc(fw_dump_size); 120 if (!fw_dump_data) 121 return; 122 123 if (wil_fw_copy_crash_dump(wil, fw_dump_data, fw_dump_size)) { 124 vfree(fw_dump_data); 125 return; 126 } 127 /* fw_dump_data will be free in device coredump release function 128 * after 5 min 129 */ 130 dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size, GFP_KERNEL); 131 wil_info(wil, "fw core dumped, size %d bytes\n", fw_dump_size); 132 } 133