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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