1 /* 2 * Copyright(c) 2011-2017 Intel Corporation. All rights reserved. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 * SOFTWARE. 22 */ 23 #include <linux/debugfs.h> 24 #include <linux/list_sort.h> 25 #include "i915_drv.h" 26 #include "gvt.h" 27 28 struct mmio_diff_param { 29 struct intel_vgpu *vgpu; 30 int total; 31 int diff; 32 struct list_head diff_mmio_list; 33 }; 34 35 struct diff_mmio { 36 struct list_head node; 37 u32 offset; 38 u32 preg; 39 u32 vreg; 40 }; 41 42 /* Compare two diff_mmio items. */ 43 static int mmio_offset_compare(void *priv, 44 struct list_head *a, struct list_head *b) 45 { 46 struct diff_mmio *ma; 47 struct diff_mmio *mb; 48 49 ma = container_of(a, struct diff_mmio, node); 50 mb = container_of(b, struct diff_mmio, node); 51 if (ma->offset < mb->offset) 52 return -1; 53 else if (ma->offset > mb->offset) 54 return 1; 55 return 0; 56 } 57 58 static inline int mmio_diff_handler(struct intel_gvt *gvt, 59 u32 offset, void *data) 60 { 61 struct drm_i915_private *dev_priv = gvt->dev_priv; 62 struct mmio_diff_param *param = data; 63 struct diff_mmio *node; 64 u32 preg, vreg; 65 66 preg = I915_READ_NOTRACE(_MMIO(offset)); 67 vreg = vgpu_vreg(param->vgpu, offset); 68 69 if (preg != vreg) { 70 node = kmalloc(sizeof(*node), GFP_KERNEL); 71 if (!node) 72 return -ENOMEM; 73 74 node->offset = offset; 75 node->preg = preg; 76 node->vreg = vreg; 77 list_add(&node->node, ¶m->diff_mmio_list); 78 param->diff++; 79 } 80 param->total++; 81 return 0; 82 } 83 84 /* Show the all the different values of tracked mmio. */ 85 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused) 86 { 87 struct intel_vgpu *vgpu = s->private; 88 struct intel_gvt *gvt = vgpu->gvt; 89 struct mmio_diff_param param = { 90 .vgpu = vgpu, 91 .total = 0, 92 .diff = 0, 93 }; 94 struct diff_mmio *node, *next; 95 96 INIT_LIST_HEAD(¶m.diff_mmio_list); 97 98 mutex_lock(&gvt->lock); 99 spin_lock_bh(&gvt->scheduler.mmio_context_lock); 100 101 mmio_hw_access_pre(gvt->dev_priv); 102 /* Recognize all the diff mmios to list. */ 103 intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, ¶m); 104 mmio_hw_access_post(gvt->dev_priv); 105 106 spin_unlock_bh(&gvt->scheduler.mmio_context_lock); 107 mutex_unlock(&gvt->lock); 108 109 /* In an ascending order by mmio offset. */ 110 list_sort(NULL, ¶m.diff_mmio_list, mmio_offset_compare); 111 112 seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff"); 113 list_for_each_entry_safe(node, next, ¶m.diff_mmio_list, node) { 114 u32 diff = node->preg ^ node->vreg; 115 116 seq_printf(s, "%08x %08x %08x %*pbl\n", 117 node->offset, node->preg, node->vreg, 118 32, &diff); 119 list_del(&node->node); 120 kfree(node); 121 } 122 seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff); 123 return 0; 124 } 125 126 static int vgpu_mmio_diff_open(struct inode *inode, struct file *file) 127 { 128 return single_open(file, vgpu_mmio_diff_show, inode->i_private); 129 } 130 131 static const struct file_operations vgpu_mmio_diff_fops = { 132 .open = vgpu_mmio_diff_open, 133 .read = seq_read, 134 .llseek = seq_lseek, 135 .release = single_release, 136 }; 137 138 /** 139 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU 140 * @vgpu: a vGPU 141 * 142 * Returns: 143 * Zero on success, negative error code if failed. 144 */ 145 int intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu) 146 { 147 struct dentry *ent; 148 char name[10] = ""; 149 150 sprintf(name, "vgpu%d", vgpu->id); 151 vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root); 152 if (!vgpu->debugfs) 153 return -ENOMEM; 154 155 ent = debugfs_create_bool("active", 0444, vgpu->debugfs, 156 &vgpu->active); 157 if (!ent) 158 return -ENOMEM; 159 160 ent = debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, 161 vgpu, &vgpu_mmio_diff_fops); 162 if (!ent) 163 return -ENOMEM; 164 165 return 0; 166 } 167 168 /** 169 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU 170 * @vgpu: a vGPU 171 */ 172 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu) 173 { 174 debugfs_remove_recursive(vgpu->debugfs); 175 vgpu->debugfs = NULL; 176 } 177 178 /** 179 * intel_gvt_debugfs_init - register gvt debugfs root entry 180 * @gvt: GVT device 181 * 182 * Returns: 183 * zero on success, negative if failed. 184 */ 185 int intel_gvt_debugfs_init(struct intel_gvt *gvt) 186 { 187 struct drm_minor *minor = gvt->dev_priv->drm.primary; 188 struct dentry *ent; 189 190 gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root); 191 if (!gvt->debugfs_root) { 192 gvt_err("Cannot create debugfs dir\n"); 193 return -ENOMEM; 194 } 195 196 ent = debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root, 197 &gvt->mmio.num_tracked_mmio); 198 if (!ent) 199 return -ENOMEM; 200 201 return 0; 202 } 203 204 /** 205 * intel_gvt_debugfs_clean - remove debugfs entries 206 * @gvt: GVT device 207 */ 208 void intel_gvt_debugfs_clean(struct intel_gvt *gvt) 209 { 210 debugfs_remove_recursive(gvt->debugfs_root); 211 gvt->debugfs_root = NULL; 212 } 213