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 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 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 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