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}