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 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 */ 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 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 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