drivers/edac/amd64_edac_inj.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "amd64_edac.h"
   3
   4 static ssize_t amd64_inject_section_show(struct device *dev,
   5                                          struct device_attribute *mattr,
   6                                          char *buf)
   7 {
   8         struct mem_ctl_info *mci = to_mci(dev);
   9         struct amd64_pvt *pvt = mci->pvt_info;
  10         return sprintf(buf, "0x%x\n", pvt->injection.section);
  11 }
  12
  13 /*
  14  * store error injection section value which refers to one of 4 16-byte sections
  15  * within a 64-byte cacheline
  16  *
  17  * range: 0..3
  18  */
  19 static ssize_t amd64_inject_section_store(struct device *dev,
  20                                           struct device_attribute *mattr,
  21                                           const char *data, size_t count)
  22 {
  23         struct mem_ctl_info *mci = to_mci(dev);
  24         struct amd64_pvt *pvt = mci->pvt_info;
  25         unsigned long value;
  26         int ret;
  27
  28         ret = kstrtoul(data, 10, &value);
  29         if (ret < 0)
  30                 return ret;
  31
  32         if (value > 3) {
  33                 amd64_warn("%s: invalid section 0x%lx\n", __func__, value);
  34                 return -EINVAL;
  35         }
  36
  37         pvt->injection.section = (u32) value;
  38         return count;
  39 }
  40
  41 static ssize_t amd64_inject_word_show(struct device *dev,
  42                                         struct device_attribute *mattr,
  43                                         char *buf)
  44 {
  45         struct mem_ctl_info *mci = to_mci(dev);
  46         struct amd64_pvt *pvt = mci->pvt_info;
  47         return sprintf(buf, "0x%x\n", pvt->injection.word);
  48 }
  49
  50 /*
  51  * store error injection word value which refers to one of 9 16-bit word of the
  52  * 16-byte (128-bit + ECC bits) section
  53  *
  54  * range: 0..8
  55  */
  56 static ssize_t amd64_inject_word_store(struct device *dev,
  57                                        struct device_attribute *mattr,
  58                                        const char *data, size_t count)
  59 {
  60         struct mem_ctl_info *mci = to_mci(dev);
  61         struct amd64_pvt *pvt = mci->pvt_info;
  62         unsigned long value;
  63         int ret;
  64
  65         ret = kstrtoul(data, 10, &value);
  66         if (ret < 0)
  67                 return ret;
  68
  69         if (value > 8) {
  70                 amd64_warn("%s: invalid word 0x%lx\n", __func__, value);
  71                 return -EINVAL;
  72         }
  73
  74         pvt->injection.word = (u32) value;
  75         return count;
  76 }
  77
  78 static ssize_t amd64_inject_ecc_vector_show(struct device *dev,
  79                                             struct device_attribute *mattr,
  80                                             char *buf)
  81 {
  82         struct mem_ctl_info *mci = to_mci(dev);
  83         struct amd64_pvt *pvt = mci->pvt_info;
  84         return sprintf(buf, "0x%x\n", pvt->injection.bit_map);
  85 }
  86
  87 /*
  88  * store 16 bit error injection vector which enables injecting errors to the
  89  * corresponding bit within the error injection word above. When used during a
  90  * DRAM ECC read, it holds the contents of the of the DRAM ECC bits.
  91  */
  92 static ssize_t amd64_inject_ecc_vector_store(struct device *dev,
  93                                        struct device_attribute *mattr,
  94                                        const char *data, size_t count)
  95 {
  96         struct mem_ctl_info *mci = to_mci(dev);
  97         struct amd64_pvt *pvt = mci->pvt_info;
  98         unsigned long value;
  99         int ret;
 100
 101         ret = kstrtoul(data, 16, &value);
 102         if (ret < 0)
 103                 return ret;
 104
 105         if (value & 0xFFFF0000) {
 106                 amd64_warn("%s: invalid EccVector: 0x%lx\n", __func__, value);
 107                 return -EINVAL;
 108         }
 109
 110         pvt->injection.bit_map = (u32) value;
 111         return count;
 112 }
 113
 114 /*
 115  * Do a DRAM ECC read. Assemble staged values in the pvt area, format into
 116  * fields needed by the injection registers and read the NB Array Data Port.
 117  */
 118 static ssize_t amd64_inject_read_store(struct device *dev,
 119                                        struct device_attribute *mattr,
 120                                        const char *data, size_t count)
 121 {
 122         struct mem_ctl_info *mci = to_mci(dev);
 123         struct amd64_pvt *pvt = mci->pvt_info;
 124         unsigned long value;
 125         u32 section, word_bits;
 126         int ret;
 127
 128         ret = kstrtoul(data, 10, &value);
 129         if (ret < 0)
 130                 return ret;
 131
 132         /* Form value to choose 16-byte section of cacheline */
 133         section = F10_NB_ARRAY_DRAM | SET_NB_ARRAY_ADDR(pvt->injection.section);
 134
 135         amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);
 136
 137         word_bits = SET_NB_DRAM_INJECTION_READ(pvt->injection);
 138
 139         /* Issue 'word' and 'bit' along with the READ request */
 140         amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);
 141
 142         edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits);
 143
 144         return count;
 145 }
 146
 147 /*
 148  * Do a DRAM ECC write. Assemble staged values in the pvt area and format into
 149  * fields needed by the injection registers.
 150  */
 151 static ssize_t amd64_inject_write_store(struct device *dev,
 152                                         struct device_attribute *mattr,
 153                                         const char *data, size_t count)
 154 {
 155         struct mem_ctl_info *mci = to_mci(dev);
 156         struct amd64_pvt *pvt = mci->pvt_info;
 157         u32 section, word_bits, tmp;
 158         unsigned long value;
 159         int ret;
 160
 161         ret = kstrtoul(data, 10, &value);
 162         if (ret < 0)
 163                 return ret;
 164
 165         /* Form value to choose 16-byte section of cacheline */
 166         section = F10_NB_ARRAY_DRAM | SET_NB_ARRAY_ADDR(pvt->injection.section);
 167
 168         amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);
 169
 170         word_bits = SET_NB_DRAM_INJECTION_WRITE(pvt->injection);
 171
 172         pr_notice_once("Don't forget to decrease MCE polling interval in\n"
 173                         "/sys/bus/machinecheck/devices/machinecheck<CPUNUM>/check_interval\n"
 174                         "so that you can get the error report faster.\n");
 175
 176         on_each_cpu(disable_caches, NULL, 1);
 177
 178         /* Issue 'word' and 'bit' along with the READ request */
 179         amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);
 180
 181  retry:
 182         /* wait until injection happens */
 183         amd64_read_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, &tmp);
 184         if (tmp & F10_NB_ARR_ECC_WR_REQ) {
 185                 cpu_relax();
 186                 goto retry;
 187         }
 188
 189         on_each_cpu(enable_caches, NULL, 1);
 190
 191         edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits);
 192
 193         return count;
 194 }
 195
 196 /*
 197  * update NUM_INJ_ATTRS in case you add new members
 198  */
 199
 200 static DEVICE_ATTR(inject_section, S_IRUGO | S_IWUSR,
 201                    amd64_inject_section_show, amd64_inject_section_store);
 202 static DEVICE_ATTR(inject_word, S_IRUGO | S_IWUSR,
 203                    amd64_inject_word_show, amd64_inject_word_store);
 204 static DEVICE_ATTR(inject_ecc_vector, S_IRUGO | S_IWUSR,
 205                    amd64_inject_ecc_vector_show, amd64_inject_ecc_vector_store);
 206 static DEVICE_ATTR(inject_write, S_IWUSR,
 207                    NULL, amd64_inject_write_store);
 208 static DEVICE_ATTR(inject_read,  S_IWUSR,
 209                    NULL, amd64_inject_read_store);
 210
 211 static struct attribute *amd64_edac_inj_attrs[] = {
 212         &dev_attr_inject_section.attr,
 213         &dev_attr_inject_word.attr,
 214         &dev_attr_inject_ecc_vector.attr,
 215         &dev_attr_inject_write.attr,
 216         &dev_attr_inject_read.attr,
 217         NULL
 218 };
 219
 220 static umode_t amd64_edac_inj_is_visible(struct kobject *kobj,
 221                                          struct attribute *attr, int idx)
 222 {
 223         struct device *dev = kobj_to_dev(kobj);
 224         struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
 225         struct amd64_pvt *pvt = mci->pvt_info;
 226
 227         if (pvt->fam < 0x10)
 228                 return 0;
 229         return attr->mode;
 230 }
 231
 232 const struct attribute_group amd64_edac_inj_group = {
 233         .attrs = amd64_edac_inj_attrs,
 234         .is_visible = amd64_edac_inj_is_visible,
 235 };