1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright(c) 2021 Intel Corporation. All rights rsvd. */ 3 #include <linux/init.h> 4 #include <linux/kernel.h> 5 #include <linux/module.h> 6 #include <linux/pci.h> 7 #include <linux/debugfs.h> 8 #include <linux/io-64-nonatomic-lo-hi.h> 9 #include <uapi/linux/idxd.h> 10 #include "idxd.h" 11 #include "registers.h" 12 13 static struct dentry *idxd_debugfs_dir; 14 15 static void dump_event_entry(struct idxd_device *idxd, struct seq_file *s, 16 u16 index, int *count, bool processed) 17 { 18 struct idxd_evl *evl = idxd->evl; 19 struct dsa_evl_entry *entry; 20 struct dsa_completion_record *cr; 21 u64 *raw; 22 int i; 23 int evl_strides = evl_ent_size(idxd) / sizeof(u64); 24 25 entry = (struct dsa_evl_entry *)evl->log + index; 26 27 if (!entry->e.desc_valid) 28 return; 29 30 seq_printf(s, "Event Log entry %d (real index %u) processed: %u\n", 31 *count, index, processed); 32 33 seq_printf(s, "desc valid %u wq idx valid %u\n" 34 "batch %u fault rw %u priv %u error 0x%x\n" 35 "wq idx %u op %#x pasid %u batch idx %u\n" 36 "fault addr %#llx\n", 37 entry->e.desc_valid, entry->e.wq_idx_valid, 38 entry->e.batch, entry->e.fault_rw, entry->e.priv, 39 entry->e.error, entry->e.wq_idx, entry->e.operation, 40 entry->e.pasid, entry->e.batch_idx, entry->e.fault_addr); 41 42 cr = &entry->cr; 43 seq_printf(s, "status %#x result %#x fault_info %#x bytes_completed %u\n" 44 "fault addr %#llx inv flags %#x\n\n", 45 cr->status, cr->result, cr->fault_info, cr->bytes_completed, 46 cr->fault_addr, cr->invalid_flags); 47 48 raw = (u64 *)entry; 49 50 for (i = 0; i < evl_strides; i++) 51 seq_printf(s, "entry[%d] = %#llx\n", i, raw[i]); 52 53 seq_puts(s, "\n"); 54 *count += 1; 55 } 56 57 static int debugfs_evl_show(struct seq_file *s, void *d) 58 { 59 struct idxd_device *idxd = s->private; 60 struct idxd_evl *evl = idxd->evl; 61 union evl_status_reg evl_status; 62 u16 h, t, evl_size, i; 63 int count = 0; 64 bool processed = true; 65 66 if (!evl || !evl->log) 67 return 0; 68 69 mutex_lock(&evl->lock); 70 71 evl_status.bits = ioread64(idxd->reg_base + IDXD_EVLSTATUS_OFFSET); 72 t = evl_status.tail; 73 h = evl_status.head; 74 evl_size = evl->size; 75 76 seq_printf(s, "Event Log head %u tail %u interrupt pending %u\n\n", 77 evl_status.head, evl_status.tail, evl_status.int_pending); 78 79 i = t; 80 while (1) { 81 i = (i + 1) % evl_size; 82 if (i == t) 83 break; 84 85 if (processed && i == h) 86 processed = false; 87 dump_event_entry(idxd, s, i, &count, processed); 88 } 89 90 mutex_unlock(&evl->lock); 91 return 0; 92 } 93 94 DEFINE_SHOW_ATTRIBUTE(debugfs_evl); 95 96 int idxd_device_init_debugfs(struct idxd_device *idxd) 97 { 98 if (IS_ERR_OR_NULL(idxd_debugfs_dir)) 99 return 0; 100 101 idxd->dbgfs_dir = debugfs_create_dir(dev_name(idxd_confdev(idxd)), idxd_debugfs_dir); 102 if (IS_ERR(idxd->dbgfs_dir)) 103 return PTR_ERR(idxd->dbgfs_dir); 104 105 if (idxd->evl) { 106 idxd->dbgfs_evl_file = debugfs_create_file("event_log", 0400, 107 idxd->dbgfs_dir, idxd, 108 &debugfs_evl_fops); 109 if (IS_ERR(idxd->dbgfs_evl_file)) { 110 debugfs_remove_recursive(idxd->dbgfs_dir); 111 idxd->dbgfs_dir = NULL; 112 return PTR_ERR(idxd->dbgfs_evl_file); 113 } 114 } 115 116 return 0; 117 } 118 119 void idxd_device_remove_debugfs(struct idxd_device *idxd) 120 { 121 debugfs_remove_recursive(idxd->dbgfs_dir); 122 } 123 124 int idxd_init_debugfs(void) 125 { 126 if (!debugfs_initialized()) 127 return 0; 128 129 idxd_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); 130 if (IS_ERR(idxd_debugfs_dir)) 131 return PTR_ERR(idxd_debugfs_dir); 132 return 0; 133 } 134 135 void idxd_remove_debugfs(void) 136 { 137 debugfs_remove_recursive(idxd_debugfs_dir); 138 } 139