drivers/net/wireless/ath/wil6210/wil_crash_dump.c

   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         set_bit(wil_status_collecting_dumps, wil->status);
  76         if (test_bit(wil_status_suspending, wil->status) ||
  77             test_bit(wil_status_suspended, wil->status) ||
  78             test_bit(wil_status_resetting, wil->status)) {
  79                 wil_err(wil, "cannot collect fw dump during suspend/reset\n");
  80                 clear_bit(wil_status_collecting_dumps, wil->status);
  81                 return -EINVAL;
  82         }
  83
  84         /* copy to crash dump area */
  85         for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) {
  86                 map = &fw_mapping[i];
  87
  88                 if (!map->fw)
  89                         continue;
  90
  91                 data = (void * __force)wil->csr + HOSTADDR(map->host);
  92                 len = map->to - map->from;
  93                 offset = map->host - host_min;
  94
  95                 wil_dbg_misc(wil,
  96                              "fw_copy_crash_dump: - dump %s, size %d, offset %d\n",
  97                              fw_mapping[i].name, len, offset);
  98
  99                 wil_memcpy_fromio_32((void * __force)(dest + offset),
 100                                      (const void __iomem * __force)data, len);
 101         }
 102
 103         clear_bit(wil_status_collecting_dumps, wil->status);
 104
 105         return 0;
 106 }
 107
 108 void wil_fw_core_dump(struct wil6210_priv *wil)
 109 {
 110         void *fw_dump_data;
 111         u32 fw_dump_size;
 112
 113         if (wil_fw_get_crash_dump_bounds(wil, &fw_dump_size, NULL)) {
 114                 wil_err(wil, "fail to get fw dump size\n");
 115                 return;
 116         }
 117
 118         fw_dump_data = vzalloc(fw_dump_size);
 119         if (!fw_dump_data)
 120                 return;
 121
 122         if (wil_fw_copy_crash_dump(wil, fw_dump_data, fw_dump_size)) {
 123                 vfree(fw_dump_data);
 124                 return;
 125         }
 126         /* fw_dump_data will be free in device coredump release function
 127          * after 5 min
 128          */
 129         dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size, GFP_KERNEL);
 130         wil_info(wil, "fw core dumped, size %d bytes\n", fw_dump_size);
 131 }