LXR linux/drivers/net/wireless/ath/wil6210/wil_crash

   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
  10static 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
  47int 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
  99void 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