1 /* 2 * Copyright (c) 2015 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->host < host_min) 40 host_min = map->host; 41 42 tmp_max = map->host + (map->to - map->from); 43 if (tmp_max > host_max) 44 host_max = tmp_max; 45 } 46 47 *out_dump_size = host_max - host_min; 48 if (out_host_min) 49 *out_host_min = host_min; 50 51 return 0; 52 } 53 54 static int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, 55 u32 size) 56 { 57 int i; 58 const struct fw_map *map; 59 void *data; 60 u32 host_min, dump_size, offset, len; 61 62 if (wil_fw_get_crash_dump_bounds(wil, &dump_size, &host_min)) { 63 wil_err(wil, "%s: fail to obtain crash dump size\n", __func__); 64 return -EINVAL; 65 } 66 67 if (dump_size > size) { 68 wil_err(wil, "%s: not enough space for dump. Need %d have %d\n", 69 __func__, dump_size, size); 70 return -EINVAL; 71 } 72 73 /* copy to crash dump area */ 74 for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) { 75 map = &fw_mapping[i]; 76 77 data = (void * __force)wil->csr + HOSTADDR(map->host); 78 len = map->to - map->from; 79 offset = map->host - host_min; 80 81 wil_dbg_misc(wil, "%s() - dump %s, size %d, offset %d\n", 82 __func__, fw_mapping[i].name, len, offset); 83 84 wil_memcpy_fromio_32((void * __force)(dest + offset), 85 (const void __iomem * __force)data, len); 86 } 87 88 return 0; 89 } 90 91 void wil_fw_core_dump(struct wil6210_priv *wil) 92 { 93 void *fw_dump_data; 94 u32 fw_dump_size; 95 96 if (wil_fw_get_crash_dump_bounds(wil, &fw_dump_size, NULL)) { 97 wil_err(wil, "%s: fail to get fw dump size\n", __func__); 98 return; 99 } 100 101 fw_dump_data = vzalloc(fw_dump_size); 102 if (!fw_dump_data) 103 return; 104 105 if (wil_fw_copy_crash_dump(wil, fw_dump_data, fw_dump_size)) { 106 vfree(fw_dump_data); 107 return; 108 } 109 /* fw_dump_data will be free in device coredump release function 110 * after 5 min 111 */ 112 dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size, GFP_KERNEL); 113 wil_info(wil, "%s: fw core dumped, size %d bytes\n", __func__, 114 fw_dump_size); 115 } 116