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  */
29 static 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  */
59 void 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 }
82 EXPORT_SYMBOL(mtk_adsp_dump);
83 
84 MODULE_LICENSE("Dual BSD/GPL");
85