cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ptdma-debugfs.c (2516B)

      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}