diff options
| -rw-r--r-- | drivers/edac/mce_amd_inj.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/edac/mce_amd_inj.c b/drivers/edac/mce_amd_inj.c index 7501b5197a6a..b8385ccd1064 100644 --- a/drivers/edac/mce_amd_inj.c +++ b/drivers/edac/mce_amd_inj.c @@ -252,6 +252,51 @@ MCE_INJECT_GET(bank); DEFINE_SIMPLE_ATTRIBUTE(bank_fops, inj_bank_get, inj_bank_set, "%llu\n"); +static const char readme_msg[] = + "\nDescription of the files and their usages:\n\n" + "status: Set a value to be programmed into MCx_STATUS(bank)\n" + "\t The status bits provide insight into the type of\n" + "\t error that caused the MCE.\n\n" + "misc: Set value of MCx_MISC(bank)\n" + "\t misc register provides auxiliary info about the error. This\n" + "\t register is typically used for error thresholding purpose and\n" + "\t validity of the register is indicated by MCx_STATUS[MiscV]\n\n" + "addr: Error address value to be written to MCx_ADDR(bank)\n" + "\t This register is used to log address information associated\n" + "\t with the error.\n\n" + "Note: See respective BKDGs for the exact bit definitions of the\n" + "\t above registers as they mirror the MCi_[STATUS | MISC | ADDR]\n" + "\t hardware registers.\n\n" + "bank: Specify the bank you want to inject the error into.\n" + "\t The number of banks in a processor varies and is family/model\n" + "\t dependent. So, a sanity check performed while writing.\n" + "\t Writing to this file will trigger a #MC or APIC interrupts or\n" + "\t invoke the error decoder routines for AMD processors. The value\n" + "\t in 'flags' file decides which of above actions is triggered.\n\n" + "flags: Write to this file to speficy the error injection policy.\n" + "\t Allowed values:\n" + "\t\t\"sw\" - SW error injection, Only calls error decoder\n" + "\t\t\troutines to print error info in human readable format\n" + "\t\t\"hw\" - HW error injection, Forces a #MC,\n" + "\t\t\tcauses exception handler to handle the error\n" + "\t\t\tif UC or poll handler catches it if CE\n" + "\t\t\tWarning: Might cause system panic if MCx_STATUS[PCC]\n" + "\t\t\tis set. For debug purposes, consider setting\n" + "\t\t\t/<debugfs_mountpoint>/mce/fake_panic\n" + "cpu: The cpu to inject the error on.\n\n"; + +static ssize_t +inj_readme_read(struct file *filp, char __user *ubuf, + size_t cnt, loff_t *ppos) +{ + return simple_read_from_buffer(ubuf, cnt, ppos, + readme_msg, strlen(readme_msg)); +} + +static const struct file_operations readme_fops = { + .read = inj_readme_read, +}; + static struct dfs_node { char *name; struct dentry *d; @@ -264,6 +309,7 @@ static struct dfs_node { { .name = "bank", .fops = &bank_fops, .perm = S_IRUSR | S_IWUSR }, { .name = "flags", .fops = &flags_fops, .perm = S_IRUSR | S_IWUSR }, { .name = "cpu", .fops = &extcpu_fops, .perm = S_IRUSR | S_IWUSR }, + { .name = "README", .fops = &readme_fops, .perm = S_IRUSR | S_IRGRP | S_IROTH }, }; static int __init init_mce_inject(void) |