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