linux/drivers/edac/amd64_edac_inj.c
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   1#include "amd64_edac.h"
   2
   3static ssize_t amd64_inject_section_show(struct device *dev,
   4                                         struct device_attribute *mattr,
   5                                         char *buf)
   6{
   7        struct mem_ctl_info *mci = to_mci(dev);
   8        struct amd64_pvt *pvt = mci->pvt_info;
   9        return sprintf(buf, "0x%x\n", pvt->injection.section);
  10}
  11
  12/*
  13 * store error injection section value which refers to one of 4 16-byte sections
  14 * within a 64-byte cacheline
  15 *
  16 * range: 0..3
  17 */
  18static ssize_t amd64_inject_section_store(struct device *dev,
  19                                          struct device_attribute *mattr,
  20                                          const char *data, size_t count)
  21{
  22        struct mem_ctl_info *mci = to_mci(dev);
  23        struct amd64_pvt *pvt = mci->pvt_info;
  24        unsigned long value;
  25        int ret;
  26
  27        ret = strict_strtoul(data, 10, &value);
  28        if (ret < 0)
  29                return ret;
  30
  31        if (value > 3) {
  32                amd64_warn("%s: invalid section 0x%lx\n", __func__, value);
  33                return -EINVAL;
  34        }
  35
  36        pvt->injection.section = (u32) value;
  37        return count;
  38}
  39
  40static ssize_t amd64_inject_word_show(struct device *dev,
  41                                        struct device_attribute *mattr,
  42                                        char *buf)
  43{
  44        struct mem_ctl_info *mci = to_mci(dev);
  45        struct amd64_pvt *pvt = mci->pvt_info;
  46        return sprintf(buf, "0x%x\n", pvt->injection.word);
  47}
  48
  49/*
  50 * store error injection word value which refers to one of 9 16-bit word of the
  51 * 16-byte (128-bit + ECC bits) section
  52 *
  53 * range: 0..8
  54 */
  55static ssize_t amd64_inject_word_store(struct device *dev,
  56                                       struct device_attribute *mattr,
  57                                       const char *data, size_t count)
  58{
  59        struct mem_ctl_info *mci = to_mci(dev);
  60        struct amd64_pvt *pvt = mci->pvt_info;
  61        unsigned long value;
  62        int ret;
  63
  64        ret = strict_strtoul(data, 10, &value);
  65        if (ret < 0)
  66                return ret;
  67
  68        if (value > 8) {
  69                amd64_warn("%s: invalid word 0x%lx\n", __func__, value);
  70                return -EINVAL;
  71        }
  72
  73        pvt->injection.word = (u32) value;
  74        return count;
  75}
  76
  77static ssize_t amd64_inject_ecc_vector_show(struct device *dev,
  78                                            struct device_attribute *mattr,
  79                                            char *buf)
  80{
  81        struct mem_ctl_info *mci = to_mci(dev);
  82        struct amd64_pvt *pvt = mci->pvt_info;
  83        return sprintf(buf, "0x%x\n", pvt->injection.bit_map);
  84}
  85
  86/*
  87 * store 16 bit error injection vector which enables injecting errors to the
  88 * corresponding bit within the error injection word above. When used during a
  89 * DRAM ECC read, it holds the contents of the of the DRAM ECC bits.
  90 */
  91static ssize_t amd64_inject_ecc_vector_store(struct device *dev,
  92                                       struct device_attribute *mattr,
  93                                       const char *data, size_t count)
  94{
  95        struct mem_ctl_info *mci = to_mci(dev);
  96        struct amd64_pvt *pvt = mci->pvt_info;
  97        unsigned long value;
  98        int ret;
  99
 100        ret = strict_strtoul(data, 16, &value);
 101        if (ret < 0)
 102                return ret;
 103
 104        if (value & 0xFFFF0000) {
 105                amd64_warn("%s: invalid EccVector: 0x%lx\n", __func__, value);
 106                return -EINVAL;
 107        }
 108
 109        pvt->injection.bit_map = (u32) value;
 110        return count;
 111}
 112
 113/*
 114 * Do a DRAM ECC read. Assemble staged values in the pvt area, format into
 115 * fields needed by the injection registers and read the NB Array Data Port.
 116 */
 117static ssize_t amd64_inject_read_store(struct device *dev,
 118                                       struct device_attribute *mattr,
 119                                       const char *data, size_t count)
 120{
 121        struct mem_ctl_info *mci = to_mci(dev);
 122        struct amd64_pvt *pvt = mci->pvt_info;
 123        unsigned long value;
 124        u32 section, word_bits;
 125        int ret;
 126
 127        ret = strict_strtoul(data, 10, &value);
 128        if (ret < 0)
 129                return ret;
 130
 131        /* Form value to choose 16-byte section of cacheline */
 132        section = F10_NB_ARRAY_DRAM | SET_NB_ARRAY_ADDR(pvt->injection.section);
 133
 134        amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);
 135
 136        word_bits = SET_NB_DRAM_INJECTION_READ(pvt->injection);
 137
 138        /* Issue 'word' and 'bit' along with the READ request */
 139        amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);
 140
 141        edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits);
 142
 143        return count;
 144}
 145
 146/*
 147 * Do a DRAM ECC write. Assemble staged values in the pvt area and format into
 148 * fields needed by the injection registers.
 149 */
 150static ssize_t amd64_inject_write_store(struct device *dev,
 151                                        struct device_attribute *mattr,
 152                                        const char *data, size_t count)
 153{
 154        struct mem_ctl_info *mci = to_mci(dev);
 155        struct amd64_pvt *pvt = mci->pvt_info;
 156        u32 section, word_bits, tmp;
 157        unsigned long value;
 158        int ret;
 159
 160        ret = strict_strtoul(data, 10, &value);
 161        if (ret < 0)
 162                return ret;
 163
 164        /* Form value to choose 16-byte section of cacheline */
 165        section = F10_NB_ARRAY_DRAM | SET_NB_ARRAY_ADDR(pvt->injection.section);
 166
 167        amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_ADDR, section);
 168
 169        word_bits = SET_NB_DRAM_INJECTION_WRITE(pvt->injection);
 170
 171        pr_notice_once("Don't forget to decrease MCE polling interval in\n"
 172                        "/sys/bus/machinecheck/devices/machinecheck<CPUNUM>/check_interval\n"
 173                        "so that you can get the error report faster.\n");
 174
 175        on_each_cpu(disable_caches, NULL, 1);
 176
 177        /* Issue 'word' and 'bit' along with the READ request */
 178        amd64_write_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, word_bits);
 179
 180 retry:
 181        /* wait until injection happens */
 182        amd64_read_pci_cfg(pvt->F3, F10_NB_ARRAY_DATA, &tmp);
 183        if (tmp & F10_NB_ARR_ECC_WR_REQ) {
 184                cpu_relax();
 185                goto retry;
 186        }
 187
 188        on_each_cpu(enable_caches, NULL, 1);
 189
 190        edac_dbg(0, "section=0x%x word_bits=0x%x\n", section, word_bits);
 191
 192        return count;
 193}
 194
 195/*
 196 * update NUM_INJ_ATTRS in case you add new members
 197 */
 198
 199static DEVICE_ATTR(inject_section, S_IRUGO | S_IWUSR,
 200                   amd64_inject_section_show, amd64_inject_section_store);
 201static DEVICE_ATTR(inject_word, S_IRUGO | S_IWUSR,
 202                   amd64_inject_word_show, amd64_inject_word_store);
 203static DEVICE_ATTR(inject_ecc_vector, S_IRUGO | S_IWUSR,
 204                   amd64_inject_ecc_vector_show, amd64_inject_ecc_vector_store);
 205static DEVICE_ATTR(inject_write, S_IWUSR,
 206                   NULL, amd64_inject_write_store);
 207static DEVICE_ATTR(inject_read,  S_IWUSR,
 208                   NULL, amd64_inject_read_store);
 209
 210
 211int amd64_create_sysfs_inject_files(struct mem_ctl_info *mci)
 212{
 213        int rc;
 214
 215        rc = device_create_file(&mci->dev, &dev_attr_inject_section);
 216        if (rc < 0)
 217                return rc;
 218        rc = device_create_file(&mci->dev, &dev_attr_inject_word);
 219        if (rc < 0)
 220                return rc;
 221        rc = device_create_file(&mci->dev, &dev_attr_inject_ecc_vector);
 222        if (rc < 0)
 223                return rc;
 224        rc = device_create_file(&mci->dev, &dev_attr_inject_write);
 225        if (rc < 0)
 226                return rc;
 227        rc = device_create_file(&mci->dev, &dev_attr_inject_read);
 228        if (rc < 0)
 229                return rc;
 230
 231        return 0;
 232}
 233
 234void amd64_remove_sysfs_inject_files(struct mem_ctl_info *mci)
 235{
 236        device_remove_file(&mci->dev, &dev_attr_inject_section);
 237        device_remove_file(&mci->dev, &dev_attr_inject_word);
 238        device_remove_file(&mci->dev, &dev_attr_inject_ecc_vector);
 239        device_remove_file(&mci->dev, &dev_attr_inject_write);
 240        device_remove_file(&mci->dev, &dev_attr_inject_read);
 241}
 242
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