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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AMD Passthrough DMA device driver4 * -- Based on the CCP driver5 *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	0x0000003F19 20#define	RI_NUM_VQM	0x0007800021#define	RI_NVQM_SHIFT	1522 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 current44 * statistics of queue for PTDMA45 */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