1 /* $NetBSD: debugfs.c,v 1.2 2021/12/18 23:45:31 riastradh Exp $ */ 2 3 /* 4 * Copyright(c) 2011-2017 Intel Corporation. All rights reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 * SOFTWARE. 24 */ 25 #include <sys/cdefs.h> 26 __KERNEL_RCSID(0, "$NetBSD: debugfs.c,v 1.2 2021/12/18 23:45:31 riastradh Exp $"); 27 28 #include <linux/debugfs.h> 29 #include <linux/list_sort.h> 30 #include "i915_drv.h" 31 #include "gvt.h" 32 33 struct mmio_diff_param { 34 struct intel_vgpu *vgpu; 35 int total; 36 int diff; 37 struct list_head diff_mmio_list; 38 }; 39 40 struct diff_mmio { 41 struct list_head node; 42 u32 offset; 43 u32 preg; 44 u32 vreg; 45 }; 46 47 /* Compare two diff_mmio items. */ 48 static int mmio_offset_compare(void *priv, 49 struct list_head *a, struct list_head *b) 50 { 51 struct diff_mmio *ma; 52 struct diff_mmio *mb; 53 54 ma = container_of(a, struct diff_mmio, node); 55 mb = container_of(b, struct diff_mmio, node); 56 if (ma->offset < mb->offset) 57 return -1; 58 else if (ma->offset > mb->offset) 59 return 1; 60 return 0; 61 } 62 63 static inline int mmio_diff_handler(struct intel_gvt *gvt, 64 u32 offset, void *data) 65 { 66 struct drm_i915_private *i915 = gvt->dev_priv; 67 struct mmio_diff_param *param = data; 68 struct diff_mmio *node; 69 u32 preg, vreg; 70 71 preg = intel_uncore_read_notrace(&i915->uncore, _MMIO(offset)); 72 vreg = vgpu_vreg(param->vgpu, offset); 73 74 if (preg != vreg) { 75 node = kmalloc(sizeof(*node), GFP_KERNEL); 76 if (!node) 77 return -ENOMEM; 78 79 node->offset = offset; 80 node->preg = preg; 81 node->vreg = vreg; 82 list_add(&node->node, ¶m->diff_mmio_list); 83 param->diff++; 84 } 85 param->total++; 86 return 0; 87 } 88 89 /* Show the all the different values of tracked mmio. */ 90 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused) 91 { 92 struct intel_vgpu *vgpu = s->private; 93 struct intel_gvt *gvt = vgpu->gvt; 94 struct mmio_diff_param param = { 95 .vgpu = vgpu, 96 .total = 0, 97 .diff = 0, 98 }; 99 struct diff_mmio *node, *next; 100 101 INIT_LIST_HEAD(¶m.diff_mmio_list); 102 103 mutex_lock(&gvt->lock); 104 spin_lock_bh(&gvt->scheduler.mmio_context_lock); 105 106 mmio_hw_access_pre(gvt->dev_priv); 107 /* Recognize all the diff mmios to list. */ 108 intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, ¶m); 109 mmio_hw_access_post(gvt->dev_priv); 110 111 spin_unlock_bh(&gvt->scheduler.mmio_context_lock); 112 mutex_unlock(&gvt->lock); 113 114 /* In an ascending order by mmio offset. */ 115 list_sort(NULL, ¶m.diff_mmio_list, mmio_offset_compare); 116 117 seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff"); 118 list_for_each_entry_safe(node, next, ¶m.diff_mmio_list, node) { 119 u32 diff = node->preg ^ node->vreg; 120 121 seq_printf(s, "%08x %08x %08x %*pbl\n", 122 node->offset, node->preg, node->vreg, 123 32, &diff); 124 list_del(&node->node); 125 kfree(node); 126 } 127 seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff); 128 return 0; 129 } 130 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff); 131 132 static int 133 vgpu_scan_nonprivbb_get(void *data, u64 *val) 134 { 135 struct intel_vgpu *vgpu = (struct intel_vgpu *)data; 136 *val = vgpu->scan_nonprivbb; 137 return 0; 138 } 139 140 /* 141 * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning 142 * of non-privileged batch buffer. e.g. 143 * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer 144 * on engine 0 and 1. 145 */ 146 static int 147 vgpu_scan_nonprivbb_set(void *data, u64 val) 148 { 149 struct intel_vgpu *vgpu = (struct intel_vgpu *)data; 150 struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv; 151 enum intel_engine_id id; 152 char buf[128], *s; 153 int len; 154 155 val &= (1 << I915_NUM_ENGINES) - 1; 156 157 if (vgpu->scan_nonprivbb == val) 158 return 0; 159 160 if (!val) 161 goto done; 162 163 len = sprintf(buf, 164 "gvt: vgpu %d turns on non-privileged batch buffers scanning on Engines:", 165 vgpu->id); 166 167 s = buf + len; 168 169 for (id = 0; id < I915_NUM_ENGINES; id++) { 170 struct intel_engine_cs *engine; 171 172 engine = dev_priv->engine[id]; 173 if (engine && (val & (1 << id))) { 174 len = snprintf(s, 4, "%d, ", engine->id); 175 s += len; 176 } else 177 val &= ~(1 << id); 178 } 179 180 if (val) 181 sprintf(s, "low performance expected."); 182 183 pr_warn("%s\n", buf); 184 185 done: 186 vgpu->scan_nonprivbb = val; 187 return 0; 188 } 189 190 DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops, 191 vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set, 192 "0x%llx\n"); 193 194 /** 195 * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU 196 * @vgpu: a vGPU 197 */ 198 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu) 199 { 200 char name[16] = ""; 201 202 snprintf(name, 16, "vgpu%d", vgpu->id); 203 vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root); 204 205 debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active); 206 debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu, 207 &vgpu_mmio_diff_fops); 208 debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu, 209 &vgpu_scan_nonprivbb_fops); 210 } 211 212 /** 213 * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU 214 * @vgpu: a vGPU 215 */ 216 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu) 217 { 218 debugfs_remove_recursive(vgpu->debugfs); 219 vgpu->debugfs = NULL; 220 } 221 222 /** 223 * intel_gvt_debugfs_init - register gvt debugfs root entry 224 * @gvt: GVT device 225 */ 226 void intel_gvt_debugfs_init(struct intel_gvt *gvt) 227 { 228 struct drm_minor *minor = gvt->dev_priv->drm.primary; 229 230 gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root); 231 232 debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root, 233 &gvt->mmio.num_tracked_mmio); 234 } 235 236 /** 237 * intel_gvt_debugfs_clean - remove debugfs entries 238 * @gvt: GVT device 239 */ 240 void intel_gvt_debugfs_clean(struct intel_gvt *gvt) 241 { 242 debugfs_remove_recursive(gvt->debugfs_root); 243 gvt->debugfs_root = NULL; 244 } 245
Indexes created Sat Sep 20 22:09:52 GMT 2025