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ACPI: APEI: EINJ: Create debugfs files to enter device id and syndrome

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EINJv2 allows users to inject multiple errors at the same time by
specifying the device id and syndrome bits for each error in a flex
array.

Create files in the einj debugfs directory to enter data for each
device id and syndrome value. Note that the specification says these
are 128-bit little-endian values. Linux doesn't have a handy helper
to manage objects of this type.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Zaid Alali <zaidal@os.amperecomputing.com>
Link: https://patch.msgid.link/20250617193026.637510-6-zaidal@os.amperecomputing.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Tony Luck 2025-06-17 12:30:24 -07:00 • committed by Rafael J. Wysocki
parent 691a0f0a55
commit 90711f7bdf
1 changed files with 97 additions and 0 deletions
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97
drivers/acpi/apei/einj-core.c
View file

@ -111,6 +111,7 @@ static char vendor_dev[64];
static u32 max_nr_components;
static u32 available_error_type;
static u32 available_error_type_v2;
static struct syndrome_array *syndrome_data;
/*
* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
@ -712,6 +713,7 @@ static u64 error_param3;
static u64 error_param4;
static struct dentry *einj_debug_dir;
static char einj_buf[32];
static bool einj_v2_enabled;
static struct { u32 mask; const char *str; } const einj_error_type_string[] = {
{ BIT(0), "Processor Correctable" },
{ BIT(1), "Processor Uncorrectable non-fatal" },
@ -848,6 +850,98 @@ static int einj_check_table(struct acpi_table_einj *einj_tab)
return 0;
}
static ssize_t u128_read(struct file *f, char __user *buf, size_t count, loff_t *off)
{
char output[2 * COMPONENT_LEN + 1];
u8 *data = f->f_inode->i_private;
int i;
if (*off >= sizeof(output))
return 0;
for (i = 0; i < COMPONENT_LEN; i++)
sprintf(output + 2 * i, "%.02x", data[COMPONENT_LEN - i - 1]);
output[2 * COMPONENT_LEN] = '\n';
return simple_read_from_buffer(buf, count, off, output, sizeof(output));
}
static ssize_t u128_write(struct file *f, const char __user *buf, size_t count, loff_t *off)
{
char input[2 + 2 * COMPONENT_LEN + 2];
u8 *save = f->f_inode->i_private;
u8 tmp[COMPONENT_LEN];
char byte[3] = {};
char *s, *e;
size_t c;
long val;
int i;
/* Require that user supply whole input line in one write(2) syscall */
if (*off)
return -EINVAL;
c = simple_write_to_buffer(input, sizeof(input), off, buf, count);
if (c < 0)
return c;
if (c < 1 || input[c - 1] != '\n')
return -EINVAL;
/* Empty line means invalidate this entry */
if (c == 1) {
memset(save, 0xff, COMPONENT_LEN);
return c;
}
if (input[0] == '0' && (input[1] == 'x' || input[1] == 'X'))
s = input + 2;
else
s = input;
e = input + c - 1;
for (i = 0; i < COMPONENT_LEN; i++) {
byte[1] = *--e;
byte[0] = e > s ? *--e : '0';
if (kstrtol(byte, 16, &val))
return -EINVAL;
tmp[i] = val;
if (e <= s)
break;
}
while (++i < COMPONENT_LEN)
tmp[i] = 0;
memcpy(save, tmp, COMPONENT_LEN);
return c;
}
static const struct file_operations u128_fops = {
.read = u128_read,
.write = u128_write,
};
static bool setup_einjv2_component_files(void)
{
char name[32];
syndrome_data = kcalloc(max_nr_components, sizeof(syndrome_data[0]), GFP_KERNEL);
if (!syndrome_data)
return false;
for (int i = 0; i < max_nr_components; i++) {
sprintf(name, "component_id%d", i);
debugfs_create_file(name, 0600, einj_debug_dir,
&syndrome_data[i].comp_id, &u128_fops);
sprintf(name, "component_syndrome%d", i);
debugfs_create_file(name, 0600, einj_debug_dir,
&syndrome_data[i].comp_synd, &u128_fops);
}
return true;
}
static int __init einj_probe(struct faux_device *fdev)
{
int rc;
@ -919,6 +1013,8 @@ static int __init einj_probe(struct faux_device *fdev)
&error_param4);
debugfs_create_x32("notrigger", S_IRUSR | S_IWUSR,
einj_debug_dir, &notrigger);
if (available_error_type & ACPI65_EINJV2_SUPP)
einj_v2_enabled = setup_einjv2_component_files();
}
if (vendor_dev[0]) {
@ -967,6 +1063,7 @@ static void __exit einj_remove(struct faux_device *fdev)
apei_resources_release(&einj_resources);
apei_resources_fini(&einj_resources);
debugfs_remove_recursive(einj_debug_dir);
kfree(syndrome_data);
acpi_put_table((struct acpi_table_header *)einj_tab);
}