drivers/fpga/dfl-fme-error.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Driver for FPGA Management Engine Error Management
   4  *
   5  * Copyright 2019 Intel Corporation, Inc.
   6  *
   7  * Authors:
   8  *   Kang Luwei <luwei.kang@intel.com>
   9  *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
  10  *   Wu Hao <hao.wu@intel.com>
  11  *   Joseph Grecco <joe.grecco@intel.com>
  12  *   Enno Luebbers <enno.luebbers@intel.com>
  13  *   Tim Whisonant <tim.whisonant@intel.com>
  14  *   Ananda Ravuri <ananda.ravuri@intel.com>
  15  *   Mitchel, Henry <henry.mitchel@intel.com>
  16  */
  17
  18 #include <linux/uaccess.h>
  19
  20 #include "dfl.h"
  21 #include "dfl-fme.h"
  22
  23 #define FME_ERROR_MASK          0x8
  24 #define FME_ERROR               0x10
  25 #define MBP_ERROR               BIT_ULL(6)
  26 #define PCIE0_ERROR_MASK        0x18
  27 #define PCIE0_ERROR             0x20
  28 #define PCIE1_ERROR_MASK        0x28
  29 #define PCIE1_ERROR             0x30
  30 #define FME_FIRST_ERROR         0x38
  31 #define FME_NEXT_ERROR          0x40
  32 #define RAS_NONFAT_ERROR_MASK   0x48
  33 #define RAS_NONFAT_ERROR        0x50
  34 #define RAS_CATFAT_ERROR_MASK   0x58
  35 #define RAS_CATFAT_ERROR        0x60
  36 #define RAS_ERROR_INJECT        0x68
  37 #define INJECT_ERROR_MASK       GENMASK_ULL(2, 0)
  38
  39 #define ERROR_MASK              GENMASK_ULL(63, 0)
  40
  41 static ssize_t pcie0_errors_show(struct device *dev,
  42                                  struct device_attribute *attr, char *buf)
  43 {
  44         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
  45         void __iomem *base;
  46         u64 value;
  47
  48         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
  49
  50         mutex_lock(&pdata->lock);
  51         value = readq(base + PCIE0_ERROR);
  52         mutex_unlock(&pdata->lock);
  53
  54         return sprintf(buf, "0x%llx\n", (unsigned long long)value);
  55 }
  56
  57 static ssize_t pcie0_errors_store(struct device *dev,
  58                                   struct device_attribute *attr,
  59                                   const char *buf, size_t count)
  60 {
  61         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
  62         void __iomem *base;
  63         int ret = 0;
  64         u64 v, val;
  65
  66         if (kstrtou64(buf, 0, &val))
  67                 return -EINVAL;
  68
  69         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
  70
  71         mutex_lock(&pdata->lock);
  72         writeq(GENMASK_ULL(63, 0), base + PCIE0_ERROR_MASK);
  73
  74         v = readq(base + PCIE0_ERROR);
  75         if (val == v)
  76                 writeq(v, base + PCIE0_ERROR);
  77         else
  78                 ret = -EINVAL;
  79
  80         writeq(0ULL, base + PCIE0_ERROR_MASK);
  81         mutex_unlock(&pdata->lock);
  82         return ret ? ret : count;
  83 }
  84 static DEVICE_ATTR_RW(pcie0_errors);
  85
  86 static ssize_t pcie1_errors_show(struct device *dev,
  87                                  struct device_attribute *attr, char *buf)
  88 {
  89         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
  90         void __iomem *base;
  91         u64 value;
  92
  93         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
  94
  95         mutex_lock(&pdata->lock);
  96         value = readq(base + PCIE1_ERROR);
  97         mutex_unlock(&pdata->lock);
  98
  99         return sprintf(buf, "0x%llx\n", (unsigned long long)value);
 100 }
 101
 102 static ssize_t pcie1_errors_store(struct device *dev,
 103                                   struct device_attribute *attr,
 104                                   const char *buf, size_t count)
 105 {
 106         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 107         void __iomem *base;
 108         int ret = 0;
 109         u64 v, val;
 110
 111         if (kstrtou64(buf, 0, &val))
 112                 return -EINVAL;
 113
 114         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 115
 116         mutex_lock(&pdata->lock);
 117         writeq(GENMASK_ULL(63, 0), base + PCIE1_ERROR_MASK);
 118
 119         v = readq(base + PCIE1_ERROR);
 120         if (val == v)
 121                 writeq(v, base + PCIE1_ERROR);
 122         else
 123                 ret = -EINVAL;
 124
 125         writeq(0ULL, base + PCIE1_ERROR_MASK);
 126         mutex_unlock(&pdata->lock);
 127         return ret ? ret : count;
 128 }
 129 static DEVICE_ATTR_RW(pcie1_errors);
 130
 131 static ssize_t nonfatal_errors_show(struct device *dev,
 132                                     struct device_attribute *attr, char *buf)
 133 {
 134         void __iomem *base;
 135
 136         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 137
 138         return sprintf(buf, "0x%llx\n",
 139                        (unsigned long long)readq(base + RAS_NONFAT_ERROR));
 140 }
 141 static DEVICE_ATTR_RO(nonfatal_errors);
 142
 143 static ssize_t catfatal_errors_show(struct device *dev,
 144                                     struct device_attribute *attr, char *buf)
 145 {
 146         void __iomem *base;
 147
 148         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 149
 150         return sprintf(buf, "0x%llx\n",
 151                        (unsigned long long)readq(base + RAS_CATFAT_ERROR));
 152 }
 153 static DEVICE_ATTR_RO(catfatal_errors);
 154
 155 static ssize_t inject_errors_show(struct device *dev,
 156                                   struct device_attribute *attr, char *buf)
 157 {
 158         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 159         void __iomem *base;
 160         u64 v;
 161
 162         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 163
 164         mutex_lock(&pdata->lock);
 165         v = readq(base + RAS_ERROR_INJECT);
 166         mutex_unlock(&pdata->lock);
 167
 168         return sprintf(buf, "0x%llx\n",
 169                        (unsigned long long)FIELD_GET(INJECT_ERROR_MASK, v));
 170 }
 171
 172 static ssize_t inject_errors_store(struct device *dev,
 173                                    struct device_attribute *attr,
 174                                    const char *buf, size_t count)
 175 {
 176         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 177         void __iomem *base;
 178         u8 inject_error;
 179         u64 v;
 180
 181         if (kstrtou8(buf, 0, &inject_error))
 182                 return -EINVAL;
 183
 184         if (inject_error & ~INJECT_ERROR_MASK)
 185                 return -EINVAL;
 186
 187         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 188
 189         mutex_lock(&pdata->lock);
 190         v = readq(base + RAS_ERROR_INJECT);
 191         v &= ~INJECT_ERROR_MASK;
 192         v |= FIELD_PREP(INJECT_ERROR_MASK, inject_error);
 193         writeq(v, base + RAS_ERROR_INJECT);
 194         mutex_unlock(&pdata->lock);
 195
 196         return count;
 197 }
 198 static DEVICE_ATTR_RW(inject_errors);
 199
 200 static ssize_t fme_errors_show(struct device *dev,
 201                                struct device_attribute *attr, char *buf)
 202 {
 203         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 204         void __iomem *base;
 205         u64 value;
 206
 207         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 208
 209         mutex_lock(&pdata->lock);
 210         value = readq(base + FME_ERROR);
 211         mutex_unlock(&pdata->lock);
 212
 213         return sprintf(buf, "0x%llx\n", (unsigned long long)value);
 214 }
 215
 216 static ssize_t fme_errors_store(struct device *dev,
 217                                 struct device_attribute *attr,
 218                                 const char *buf, size_t count)
 219 {
 220         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 221         void __iomem *base;
 222         u64 v, val;
 223         int ret = 0;
 224
 225         if (kstrtou64(buf, 0, &val))
 226                 return -EINVAL;
 227
 228         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 229
 230         mutex_lock(&pdata->lock);
 231         writeq(GENMASK_ULL(63, 0), base + FME_ERROR_MASK);
 232
 233         v = readq(base + FME_ERROR);
 234         if (val == v)
 235                 writeq(v, base + FME_ERROR);
 236         else
 237                 ret = -EINVAL;
 238
 239         /* Workaround: disable MBP_ERROR if feature revision is 0 */
 240         writeq(dfl_feature_revision(base) ? 0ULL : MBP_ERROR,
 241                base + FME_ERROR_MASK);
 242         mutex_unlock(&pdata->lock);
 243         return ret ? ret : count;
 244 }
 245 static DEVICE_ATTR_RW(fme_errors);
 246
 247 static ssize_t first_error_show(struct device *dev,
 248                                 struct device_attribute *attr, char *buf)
 249 {
 250         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 251         void __iomem *base;
 252         u64 value;
 253
 254         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 255
 256         mutex_lock(&pdata->lock);
 257         value = readq(base + FME_FIRST_ERROR);
 258         mutex_unlock(&pdata->lock);
 259
 260         return sprintf(buf, "0x%llx\n", (unsigned long long)value);
 261 }
 262 static DEVICE_ATTR_RO(first_error);
 263
 264 static ssize_t next_error_show(struct device *dev,
 265                                struct device_attribute *attr, char *buf)
 266 {
 267         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 268         void __iomem *base;
 269         u64 value;
 270
 271         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 272
 273         mutex_lock(&pdata->lock);
 274         value = readq(base + FME_NEXT_ERROR);
 275         mutex_unlock(&pdata->lock);
 276
 277         return sprintf(buf, "0x%llx\n", (unsigned long long)value);
 278 }
 279 static DEVICE_ATTR_RO(next_error);
 280
 281 static struct attribute *fme_global_err_attrs[] = {
 282         &dev_attr_pcie0_errors.attr,
 283         &dev_attr_pcie1_errors.attr,
 284         &dev_attr_nonfatal_errors.attr,
 285         &dev_attr_catfatal_errors.attr,
 286         &dev_attr_inject_errors.attr,
 287         &dev_attr_fme_errors.attr,
 288         &dev_attr_first_error.attr,
 289         &dev_attr_next_error.attr,
 290         NULL,
 291 };
 292
 293 static umode_t fme_global_err_attrs_visible(struct kobject *kobj,
 294                                             struct attribute *attr, int n)
 295 {
 296         struct device *dev = kobj_to_dev(kobj);
 297
 298         /*
 299          * sysfs entries are visible only if related private feature is
 300          * enumerated.
 301          */
 302         if (!dfl_get_feature_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR))
 303                 return 0;
 304
 305         return attr->mode;
 306 }
 307
 308 const struct attribute_group fme_global_err_group = {
 309         .name       = "errors",
 310         .attrs      = fme_global_err_attrs,
 311         .is_visible = fme_global_err_attrs_visible,
 312 };
 313
 314 static void fme_err_mask(struct device *dev, bool mask)
 315 {
 316         struct dfl_feature_platform_data *pdata = dev_get_platdata(dev);
 317         void __iomem *base;
 318
 319         base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
 320
 321         mutex_lock(&pdata->lock);
 322
 323         /* Workaround: keep MBP_ERROR always masked if revision is 0 */
 324         if (dfl_feature_revision(base))
 325                 writeq(mask ? ERROR_MASK : 0, base + FME_ERROR_MASK);
 326         else
 327                 writeq(mask ? ERROR_MASK : MBP_ERROR, base + FME_ERROR_MASK);
 328
 329         writeq(mask ? ERROR_MASK : 0, base + PCIE0_ERROR_MASK);
 330         writeq(mask ? ERROR_MASK : 0, base + PCIE1_ERROR_MASK);
 331         writeq(mask ? ERROR_MASK : 0, base + RAS_NONFAT_ERROR_MASK);
 332         writeq(mask ? ERROR_MASK : 0, base + RAS_CATFAT_ERROR_MASK);
 333
 334         mutex_unlock(&pdata->lock);
 335 }
 336
 337 static int fme_global_err_init(struct platform_device *pdev,
 338                                struct dfl_feature *feature)
 339 {
 340         fme_err_mask(&pdev->dev, false);
 341
 342         return 0;
 343 }
 344
 345 static void fme_global_err_uinit(struct platform_device *pdev,
 346                                  struct dfl_feature *feature)
 347 {
 348         fme_err_mask(&pdev->dev, true);
 349 }
 350
 351 const struct dfl_feature_id fme_global_err_id_table[] = {
 352         {.id = FME_FEATURE_ID_GLOBAL_ERR,},
 353         {0,}
 354 };
 355
 356 const struct dfl_feature_ops fme_global_err_ops = {
 357         .init = fme_global_err_init,
 358         .uinit = fme_global_err_uinit,
 359 };