a061894587
Accessing some of the memory of the device while the device is resetting or suspending may cause unexpected error as the HW is still not in a stable state. Prevent this access to guarantee successful read/write memory operations. Signed-off-by: Ahmad Masri <amasri@codeaurora.org> Signed-off-by: Maya Erez <merez@codeaurora.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*
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* Copyright (c) 2015,2017 Qualcomm Atheros, Inc.
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* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "wil6210.h"
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#include <linux/devcoredump.h>
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static int wil_fw_get_crash_dump_bounds(struct wil6210_priv *wil,
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u32 *out_dump_size, u32 *out_host_min)
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{
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int i;
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const struct fw_map *map;
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u32 host_min, host_max, tmp_max;
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if (!out_dump_size)
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return -EINVAL;
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/* calculate the total size of the unpacked crash dump */
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BUILD_BUG_ON(ARRAY_SIZE(fw_mapping) == 0);
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map = &fw_mapping[0];
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host_min = map->host;
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host_max = map->host + (map->to - map->from);
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for (i = 1; i < ARRAY_SIZE(fw_mapping); i++) {
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map = &fw_mapping[i];
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if (!map->crash_dump)
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continue;
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if (map->host < host_min)
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host_min = map->host;
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tmp_max = map->host + (map->to - map->from);
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if (tmp_max > host_max)
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host_max = tmp_max;
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}
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*out_dump_size = host_max - host_min;
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if (out_host_min)
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*out_host_min = host_min;
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return 0;
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}
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int wil_fw_copy_crash_dump(struct wil6210_priv *wil, void *dest, u32 size)
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{
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int i, rc;
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const struct fw_map *map;
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void *data;
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u32 host_min, dump_size, offset, len;
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if (wil_fw_get_crash_dump_bounds(wil, &dump_size, &host_min)) {
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wil_err(wil, "fail to obtain crash dump size\n");
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return -EINVAL;
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}
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if (dump_size > size) {
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wil_err(wil, "not enough space for dump. Need %d have %d\n",
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dump_size, size);
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return -EINVAL;
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}
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rc = wil_mem_access_lock(wil);
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if (rc)
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return rc;
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/* copy to crash dump area */
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for (i = 0; i < ARRAY_SIZE(fw_mapping); i++) {
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map = &fw_mapping[i];
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if (!map->crash_dump)
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continue;
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data = (void * __force)wil->csr + HOSTADDR(map->host);
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len = map->to - map->from;
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offset = map->host - host_min;
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wil_dbg_misc(wil,
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"fw_copy_crash_dump: - dump %s, size %d, offset %d\n",
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fw_mapping[i].name, len, offset);
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wil_memcpy_fromio_32((void * __force)(dest + offset),
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(const void __iomem * __force)data, len);
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}
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wil_mem_access_unlock(wil);
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return 0;
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}
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void wil_fw_core_dump(struct wil6210_priv *wil)
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{
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void *fw_dump_data;
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u32 fw_dump_size;
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if (wil_fw_get_crash_dump_bounds(wil, &fw_dump_size, NULL)) {
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wil_err(wil, "fail to get fw dump size\n");
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return;
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}
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fw_dump_data = vzalloc(fw_dump_size);
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if (!fw_dump_data)
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return;
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if (wil_fw_copy_crash_dump(wil, fw_dump_data, fw_dump_size)) {
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vfree(fw_dump_data);
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return;
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}
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/* fw_dump_data will be free in device coredump release function
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* after 5 min
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*/
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dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size, GFP_KERNEL);
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wil_info(wil, "fw core dumped, size %d bytes\n", fw_dump_size);
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}
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