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
pt_debugfs_info_show(struct seq_file * s,void * p)23 static 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 */
pt_debugfs_stats_show(struct seq_file * s,void * p)46 static 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
pt_debugfs_queue_show(struct seq_file * s,void * p)55 static 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
81 DEFINE_SHOW_ATTRIBUTE(pt_debugfs_info);
82 DEFINE_SHOW_ATTRIBUTE(pt_debugfs_queue);
83 DEFINE_SHOW_ATTRIBUTE(pt_debugfs_stats);
84
ptdma_debugfs_setup(struct pt_device * pt)85 void 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