cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mtk-adsp-common.c (2641B)

      1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
      2//
      3// This file is provided under a dual BSD/GPLv2 license. When using or
      4// redistributing this file, you may do so under either license.
      5//
      6// Copyright(c) 2022 MediaTek Inc. All rights reserved.
      7//
      8// Author: YC Hung <yc.hung@mediatek.com>
      9
     10/*
     11 * Common helpers for the audio DSP on MediaTek platforms
     12 */
     13
     14#include <linux/module.h>
     15#include <sound/sof/xtensa.h>
     16#include "../ops.h"
     17#include "mtk-adsp-common.h"
     18
     19/**
     20 * mtk_adsp_get_registers() - This function is called in case of DSP oops
     21 * in order to gather information about the registers, filename and
     22 * linenumber and stack.
     23 * @sdev: SOF device
     24 * @xoops: Stores information about registers.
     25 * @panic_info: Stores information about filename and line number.
     26 * @stack: Stores the stack dump.
     27 * @stack_words: Size of the stack dump.
     28 */
     29static void mtk_adsp_get_registers(struct snd_sof_dev *sdev,
     30				   struct sof_ipc_dsp_oops_xtensa *xoops,
     31				   struct sof_ipc_panic_info *panic_info,
     32				   u32 *stack, size_t stack_words)
     33{
     34	u32 offset = sdev->dsp_oops_offset;
     35
     36	/* first read registers */
     37	sof_mailbox_read(sdev, offset, xoops, sizeof(*xoops));
     38
     39	/* then get panic info */
     40	if (xoops->arch_hdr.totalsize > EXCEPT_MAX_HDR_SIZE) {
     41		dev_err(sdev->dev, "invalid header size 0x%x\n",
     42			xoops->arch_hdr.totalsize);
     43		return;
     44	}
     45	offset += xoops->arch_hdr.totalsize;
     46	sof_mailbox_read(sdev, offset, panic_info, sizeof(*panic_info));
     47
     48	/* then get the stack */
     49	offset += sizeof(*panic_info);
     50	sof_mailbox_read(sdev, offset, stack, stack_words * sizeof(u32));
     51}
     52
     53/**
     54 * mtk_adsp_dump() - This function is called when a panic message is
     55 * received from the firmware.
     56 * @sdev: SOF device
     57 * @flags: parameter not used but required by ops prototype
     58 */
     59void mtk_adsp_dump(struct snd_sof_dev *sdev, u32 flags)
     60{
     61	char *level = (flags & SOF_DBG_DUMP_OPTIONAL) ? KERN_DEBUG : KERN_ERR;
     62	struct sof_ipc_dsp_oops_xtensa xoops;
     63	struct sof_ipc_panic_info panic_info;
     64	u32 stack[MTK_ADSP_STACK_DUMP_SIZE];
     65	u32 status;
     66
     67	/* Get information about the panic status from the debug box area.
     68	 * Compute the trace point based on the status.
     69	 */
     70	sof_mailbox_read(sdev, sdev->debug_box.offset + 0x4, &status, 4);
     71
     72	/* Get information about the registers, the filename and line
     73	 * number and the stack.
     74	 */
     75	mtk_adsp_get_registers(sdev, &xoops, &panic_info, stack,
     76			       MTK_ADSP_STACK_DUMP_SIZE);
     77
     78	/* Print the information to the console */
     79	sof_print_oops_and_stack(sdev, level, status, status, &xoops, &panic_info,
     80				 stack, MTK_ADSP_STACK_DUMP_SIZE);
     81}
     82EXPORT_SYMBOL(mtk_adsp_dump);
     83
     84MODULE_LICENSE("Dual BSD/GPL");