1 /* 2 * Copyright © 2012 Intel Corporation 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 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 * 23 * Authors: 24 * Ben Widawsky <ben@bwidawsk.net> 25 * 26 */ 27 28 #include <linux/device.h> 29 #include <linux/module.h> 30 #include <linux/stat.h> 31 #include <linux/sysfs.h> 32 33 #include "gt/intel_gt_regs.h" 34 #include "gt/intel_rc6.h" 35 #include "gt/intel_rps.h" 36 #include "gt/sysfs_engines.h" 37 38 #include "i915_drv.h" 39 #include "i915_sysfs.h" 40 #include "intel_pm.h" 41 42 struct drm_i915_private *kdev_minor_to_i915(struct device *kdev) 43 { 44 struct drm_minor *minor = dev_get_drvdata(kdev); 45 return to_i915(minor->dev); 46 } 47 48 static int l3_access_valid(struct drm_i915_private *i915, loff_t offset) 49 { 50 if (!HAS_L3_DPF(i915)) 51 return -EPERM; 52 53 if (!IS_ALIGNED(offset, sizeof(u32))) 54 return -EINVAL; 55 56 if (offset >= GEN7_L3LOG_SIZE) 57 return -ENXIO; 58 59 return 0; 60 } 61 62 static ssize_t 63 i915_l3_read(struct file *filp, struct kobject *kobj, 64 struct bin_attribute *attr, char *buf, 65 loff_t offset, size_t count) 66 { 67 struct device *kdev = kobj_to_dev(kobj); 68 struct drm_i915_private *i915 = kdev_minor_to_i915(kdev); 69 int slice = (int)(uintptr_t)attr->private; 70 int ret; 71 72 ret = l3_access_valid(i915, offset); 73 if (ret) 74 return ret; 75 76 count = round_down(count, sizeof(u32)); 77 count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count); 78 memset(buf, 0, count); 79 80 spin_lock(&i915->gem.contexts.lock); 81 if (i915->l3_parity.remap_info[slice]) 82 memcpy(buf, 83 i915->l3_parity.remap_info[slice] + offset / sizeof(u32), 84 count); 85 spin_unlock(&i915->gem.contexts.lock); 86 87 return count; 88 } 89 90 static ssize_t 91 i915_l3_write(struct file *filp, struct kobject *kobj, 92 struct bin_attribute *attr, char *buf, 93 loff_t offset, size_t count) 94 { 95 struct device *kdev = kobj_to_dev(kobj); 96 struct drm_i915_private *i915 = kdev_minor_to_i915(kdev); 97 int slice = (int)(uintptr_t)attr->private; 98 u32 *remap_info, *freeme = NULL; 99 struct i915_gem_context *ctx; 100 int ret; 101 102 ret = l3_access_valid(i915, offset); 103 if (ret) 104 return ret; 105 106 if (count < sizeof(u32)) 107 return -EINVAL; 108 109 remap_info = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL); 110 if (!remap_info) 111 return -ENOMEM; 112 113 spin_lock(&i915->gem.contexts.lock); 114 115 if (i915->l3_parity.remap_info[slice]) { 116 freeme = remap_info; 117 remap_info = i915->l3_parity.remap_info[slice]; 118 } else { 119 i915->l3_parity.remap_info[slice] = remap_info; 120 } 121 122 count = round_down(count, sizeof(u32)); 123 memcpy(remap_info + offset / sizeof(u32), buf, count); 124 125 /* NB: We defer the remapping until we switch to the context */ 126 list_for_each_entry(ctx, &i915->gem.contexts.list, link) 127 ctx->remap_slice |= BIT(slice); 128 129 spin_unlock(&i915->gem.contexts.lock); 130 kfree(freeme); 131 132 /* 133 * TODO: Ideally we really want a GPU reset here to make sure errors 134 * aren't propagated. Since I cannot find a stable way to reset the GPU 135 * at this point it is left as a TODO. 136 */ 137 138 return count; 139 } 140 141 static const struct bin_attribute dpf_attrs = { 142 .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)}, 143 .size = GEN7_L3LOG_SIZE, 144 .read = i915_l3_read, 145 .write = i915_l3_write, 146 .mmap = NULL, 147 .private = (void *)0 148 }; 149 150 static const struct bin_attribute dpf_attrs_1 = { 151 .attr = {.name = "l3_parity_slice_1", .mode = (S_IRUSR | S_IWUSR)}, 152 .size = GEN7_L3LOG_SIZE, 153 .read = i915_l3_read, 154 .write = i915_l3_write, 155 .mmap = NULL, 156 .private = (void *)1 157 }; 158 159 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR) 160 161 static ssize_t error_state_read(struct file *filp, struct kobject *kobj, 162 struct bin_attribute *attr, char *buf, 163 loff_t off, size_t count) 164 { 165 166 struct device *kdev = kobj_to_dev(kobj); 167 struct drm_i915_private *i915 = kdev_minor_to_i915(kdev); 168 struct i915_gpu_coredump *gpu; 169 ssize_t ret = 0; 170 171 /* 172 * FIXME: Concurrent clients triggering resets and reading + clearing 173 * dumps can cause inconsistent sysfs reads when a user calls in with a 174 * non-zero offset to complete a prior partial read but the 175 * gpu_coredump has been cleared or replaced. 176 */ 177 178 gpu = i915_first_error_state(i915); 179 if (IS_ERR(gpu)) { 180 ret = PTR_ERR(gpu); 181 } else if (gpu) { 182 ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count); 183 i915_gpu_coredump_put(gpu); 184 } else { 185 const char *str = "No error state collected\n"; 186 size_t len = strlen(str); 187 188 if (off < len) { 189 ret = min_t(size_t, count, len - off); 190 memcpy(buf, str + off, ret); 191 } 192 } 193 194 return ret; 195 } 196 197 static ssize_t error_state_write(struct file *file, struct kobject *kobj, 198 struct bin_attribute *attr, char *buf, 199 loff_t off, size_t count) 200 { 201 struct device *kdev = kobj_to_dev(kobj); 202 struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev); 203 204 drm_dbg(&dev_priv->drm, "Resetting error state\n"); 205 i915_reset_error_state(dev_priv); 206 207 return count; 208 } 209 210 static const struct bin_attribute error_state_attr = { 211 .attr.name = "error", 212 .attr.mode = S_IRUSR | S_IWUSR, 213 .size = 0, 214 .read = error_state_read, 215 .write = error_state_write, 216 }; 217 218 static void i915_setup_error_capture(struct device *kdev) 219 { 220 if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr)) 221 DRM_ERROR("error_state sysfs setup failed\n"); 222 } 223 224 static void i915_teardown_error_capture(struct device *kdev) 225 { 226 sysfs_remove_bin_file(&kdev->kobj, &error_state_attr); 227 } 228 #else 229 static void i915_setup_error_capture(struct device *kdev) {} 230 static void i915_teardown_error_capture(struct device *kdev) {} 231 #endif 232 233 void i915_setup_sysfs(struct drm_i915_private *dev_priv) 234 { 235 struct device *kdev = dev_priv->drm.primary->kdev; 236 int ret; 237 238 if (HAS_L3_DPF(dev_priv)) { 239 ret = device_create_bin_file(kdev, &dpf_attrs); 240 if (ret) 241 drm_err(&dev_priv->drm, 242 "l3 parity sysfs setup failed\n"); 243 244 if (NUM_L3_SLICES(dev_priv) > 1) { 245 ret = device_create_bin_file(kdev, 246 &dpf_attrs_1); 247 if (ret) 248 drm_err(&dev_priv->drm, 249 "l3 parity slice 1 setup failed\n"); 250 } 251 } 252 253 dev_priv->sysfs_gt = kobject_create_and_add("gt", &kdev->kobj); 254 if (!dev_priv->sysfs_gt) 255 drm_warn(&dev_priv->drm, 256 "failed to register GT sysfs directory\n"); 257 258 i915_setup_error_capture(kdev); 259 260 intel_engines_add_sysfs(dev_priv); 261 } 262 263 void i915_teardown_sysfs(struct drm_i915_private *dev_priv) 264 { 265 struct device *kdev = dev_priv->drm.primary->kdev; 266 267 i915_teardown_error_capture(kdev); 268 269 device_remove_bin_file(kdev, &dpf_attrs_1); 270 device_remove_bin_file(kdev, &dpf_attrs); 271 272 kobject_put(dev_priv->sysfs_gt); 273 } 274