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 *i915 = gvt->dev_priv; 62 struct mmio_diff_param *param = data; 63 struct diff_mmio *node; 64 u32 preg, vreg; 65 66 preg = intel_uncore_read_notrace(&i915->uncore, _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 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff); 126 127 static int 128 vgpu_scan_nonprivbb_get(void *data, u64 *val) 129 { 130 struct intel_vgpu *vgpu = (struct intel_vgpu *)data; 131 *val = vgpu->scan_nonprivbb; 132 return 0; 133 } 134 135 /* 136 * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning 137 * of non-privileged batch buffer. e.g. 138 * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer 139 * on engine 0 and 1. 140 */ 141 static int 142 vgpu_scan_nonprivbb_set(void *data, u64 val) 143 { 144 struct intel_vgpu *vgpu = (struct intel_vgpu *)data; 145 struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv; 146 enum intel_engine_id id; 147 char buf[128], *s; 148 int len; 149 150 val &= (1 << I915_NUM_ENGINES) - 1; 151 152 if (vgpu->scan_nonprivbb == val) 153 return 0; 154 155 if (!val) 156 goto done; 157 158 len = sprintf(buf, 159 "gvt: vgpu %d turns on non-privileged batch buffers scanning on Engines:", 160 vgpu->id); 161 162 s = buf + len; 163 164 for (id = 0; id < I915_NUM_ENGINES; id++) { 165 struct intel_engine_cs *engine; 166 167 engine = dev_priv->engine[id]; 168 if (engine && (val & (1 << id))) { 169 len = snprintf(s, 4, "%d, ", engine->id); 170 s += len; 171 } else 172 val &= ~(1 << id); 173 } 174 175 if (val) 176 sprintf(s, "low performance expected."); 177 178 pr_warn("%s\n", buf); 179 180 done: 181 vgpu->scan_nonprivbb = val; 182 return 0; 183 } 184 185 DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops, 186 vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set, 187 "0x%llx\n"); 188 189 /** 190 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU 191 * @vgpu: a vGPU 192 */ 193 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu) 194 { 195 char name[16] = ""; 196 197 snprintf(name, 16, "vgpu%d", vgpu->id); 198 vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root); 199 200 debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active); 201 debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu, 202 &vgpu_mmio_diff_fops); 203 debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu, 204 &vgpu_scan_nonprivbb_fops); 205 } 206 207 /** 208 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU 209 * @vgpu: a vGPU 210 */ 211 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu) 212 { 213 debugfs_remove_recursive(vgpu->debugfs); 214 vgpu->debugfs = NULL; 215 } 216 217 /** 218 * intel_gvt_debugfs_init - register gvt debugfs root entry 219 * @gvt: GVT device 220 */ 221 void intel_gvt_debugfs_init(struct intel_gvt *gvt) 222 { 223 struct drm_minor *minor = gvt->dev_priv->drm.primary; 224 225 gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root); 226 227 debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root, 228 &gvt->mmio.num_tracked_mmio); 229 } 230 231 /** 232 * intel_gvt_debugfs_clean - remove debugfs entries 233 * @gvt: GVT device 234 */ 235 void intel_gvt_debugfs_clean(struct intel_gvt *gvt) 236 { 237 debugfs_remove_recursive(gvt->debugfs_root); 238 gvt->debugfs_root = NULL; 239 } 240