1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * AMD Passthrough DMA device driver
4 * -- Based on the CCP driver
5 *
6 * Copyright (C) 2016,2021 Advanced Micro Devices, Inc.
7 *
8 * Author: Sanjay R Mehta <sanju.mehta@amd.com>
9 * Author: Gary R Hook <gary.hook@amd.com>
10 */
11
12#include <linux/debugfs.h>
13#include <linux/seq_file.h>
14
15#include "ptdma.h"
16
17/* DebugFS helpers */
18#define	RI_VERSION_NUM	0x0000003F
19
20#define	RI_NUM_VQM	0x00078000
21#define	RI_NVQM_SHIFT	15
22
23static int pt_debugfs_info_show(struct seq_file *s, void *p)
24{
25	struct pt_device *pt = s->private;
26	unsigned int regval;
27
28	seq_printf(s, "Device name: %s\n", dev_name(pt->dev));
29	seq_printf(s, "   # Queues: %d\n", 1);
30	seq_printf(s, "     # Cmds: %d\n", pt->cmd_count);
31
32	regval = ioread32(pt->io_regs + CMD_PT_VERSION);
33
34	seq_printf(s, "    Version: %d\n", regval & RI_VERSION_NUM);
35	seq_puts(s, "    Engines:");
36	seq_puts(s, "\n");
37	seq_printf(s, "     Queues: %d\n", (regval & RI_NUM_VQM) >> RI_NVQM_SHIFT);
38
39	return 0;
40}
41
42/*
43 * Return a formatted buffer containing the current
44 * statistics of queue for PTDMA
45 */
46static int pt_debugfs_stats_show(struct seq_file *s, void *p)
47{
48	struct pt_device *pt = s->private;
49
50	seq_printf(s, "Total Interrupts Handled: %ld\n", pt->total_interrupts);
51
52	return 0;
53}
54
55static int pt_debugfs_queue_show(struct seq_file *s, void *p)
56{
57	struct pt_cmd_queue *cmd_q = s->private;
58	unsigned int regval;
59
60	if (!cmd_q)
61		return 0;
62
63	seq_printf(s, "               Pass-Thru: %ld\n", cmd_q->total_pt_ops);
64
65	regval = ioread32(cmd_q->reg_control + 0x000C);
66
67	seq_puts(s, "      Enabled Interrupts:");
68	if (regval & INT_EMPTY_QUEUE)
69		seq_puts(s, " EMPTY");
70	if (regval & INT_QUEUE_STOPPED)
71		seq_puts(s, " STOPPED");
72	if (regval & INT_ERROR)
73		seq_puts(s, " ERROR");
74	if (regval & INT_COMPLETION)
75		seq_puts(s, " COMPLETION");
76	seq_puts(s, "\n");
77
78	return 0;
79}
80
81DEFINE_SHOW_ATTRIBUTE(pt_debugfs_info);
82DEFINE_SHOW_ATTRIBUTE(pt_debugfs_queue);
83DEFINE_SHOW_ATTRIBUTE(pt_debugfs_stats);
84
85void ptdma_debugfs_setup(struct pt_device *pt)
86{
87	struct pt_cmd_queue *cmd_q;
88	struct dentry *debugfs_q_instance;
89
90	if (!debugfs_initialized())
91		return;
92
93	debugfs_create_file("info", 0400, pt->dma_dev.dbg_dev_root, pt,
94			    &pt_debugfs_info_fops);
95
96	debugfs_create_file("stats", 0400, pt->dma_dev.dbg_dev_root, pt,
97			    &pt_debugfs_stats_fops);
98
99	cmd_q = &pt->cmd_q;
100
101	debugfs_q_instance =
102		debugfs_create_dir("q", pt->dma_dev.dbg_dev_root);
103
104	debugfs_create_file("stats", 0400, debugfs_q_instance, cmd_q,
105			    &pt_debugfs_queue_fops);
106}
107