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

   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 }