[PATCH v3 5/9] ACPI: APEI: EINJ: Enable the discovery of EINJv2 capabilities

Zaid Alali
2025-02-10T18:37:30Z

Enable the driver to show all supported error injections for EINJ
and EINJv2 at the same time. EINJv2 capabilities can be discovered
by checking the return value of get_error_type, where bit 30 set
indicates EINJv2 support.

Signed-off-by: Zaid Alali <zaidal@os.amperecomputing.com>
---
drivers/acpi/apei/apei-internal.h | 2 +-
drivers/acpi/apei/einj-core.c | 65 ++++++++++++++++++++++++-------
drivers/acpi/apei/einj-cxl.c | 2 +-
3 files changed, 52 insertions(+), 17 deletions(-)

diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h
index cd2766c69d78..77c10a7a7a9f 100644
--- a/drivers/acpi/apei/apei-internal.h
+++ b/drivers/acpi/apei/apei-internal.h
@@ -131,7 +131,7 @@ static inline u32 cper_estatus_len(struct acpi_hest_generic_status *estatus)

int apei_osc_setup(void);

-int einj_get_available_error_type(u32 *type);
+int einj_get_available_error_type(u32 *type, int einj_action);
int einj_error_inject(u32 type, u32 flags, u64 param1, u64 param2, u64 param3,
u64 param4);
int einj_cxl_rch_error_inject(u32 type, u32 flags, u64 param1, u64 param2,
diff --git a/drivers/acpi/apei/einj-core.c b/drivers/acpi/apei/einj-core.c
index 0f65e8bc4c30..369d92e410c1 100644
--- a/drivers/acpi/apei/einj-core.c
+++ b/drivers/acpi/apei/einj-core.c
@@ -33,6 +33,7 @@
#define SLEEP_UNIT_MAX 5000 /* 5ms */
/* Firmware should respond within 1 seconds */
#define FIRMWARE_TIMEOUT (1 * USEC_PER_SEC)
+#define ACPI65_EINJV2_SUPP BIT(30)
#define ACPI5_VENDOR_BIT BIT(31)
#define MEM_ERROR_MASK (ACPI_EINJ_MEMORY_CORRECTABLE | \
ACPI_EINJ_MEMORY_UNCORRECTABLE | \
@@ -84,6 +85,7 @@ static struct debugfs_blob_wrapper vendor_errors;
static char vendor_dev[64];

static u32 available_error_type;
+static u32 available_error_type_v2;

/*
* Some BIOSes allow parameters to the SET_ERROR_TYPE entries in the
@@ -159,13 +161,13 @@ static void einj_exec_ctx_init(struct apei_exec_context *ctx)
EINJ_TAB_ENTRY(einj_tab), einj_tab->entries);
}

-static int __einj_get_available_error_type(u32 *type)
+static int __einj_get_available_error_type(u32 *type, int einj_action)
{
struct apei_exec_context ctx;
int rc;

einj_exec_ctx_init(&ctx);
- rc = apei_exec_run(&ctx, ACPI_EINJ_GET_ERROR_TYPE);
+ rc = apei_exec_run(&ctx, einj_action);
if (rc)
return rc;
*type = apei_exec_ctx_get_output(&ctx);
@@ -174,12 +176,12 @@ static int __einj_get_available_error_type(u32 *type)
}

/* Get error injection capabilities of the platform */
-int einj_get_available_error_type(u32 *type)
+int einj_get_available_error_type(u32 *type, int einj_action)
{
int rc;

mutex_lock(&einj_mutex);
- rc = __einj_get_available_error_type(type);
+ rc = __einj_get_available_error_type(type, einj_action);
mutex_unlock(&einj_mutex);

return rc;
@@ -649,6 +651,8 @@ static u64 error_param2;
static u64 error_param3;
static u64 error_param4;
static struct dentry *einj_debug_dir;
+#define BUFF_SIZE 32
+static char einj_buf[BUFF_SIZE];
static struct { u32 mask; const char *str; } const einj_error_type_string[] = {
{ BIT(0), "Processor Correctable" },
{ BIT(1), "Processor Uncorrectable non-fatal" },
@@ -665,6 +669,12 @@ static struct { u32 mask; const char *str; } const einj_error_type_string[] = {
{ BIT(31), "Vendor Defined Error Types" },
};

+static struct { u32 mask; const char *str; } const einjv2_error_type_string[] = {
+ { BIT(0), "EINJV2 Processor Error" },
+ { BIT(1), "EINJV2 Memory Error" },
+ { BIT(2), "EINJV2 PCI Express Error" },
+};
+
static int available_error_type_show(struct seq_file *m, void *v)
{

@@ -672,17 +682,21 @@ static int available_error_type_show(struct seq_file *m, void *v)
if (available_error_type & einj_error_type_string[pos].mask)
seq_printf(m, "0x%08x\t%s\n", einj_error_type_string[pos].mask,
einj_error_type_string[pos].str);
-
+ if (available_error_type & ACPI65_EINJV2_SUPP) {
+ for (int pos = 0; pos < ARRAY_SIZE(einjv2_error_type_string); pos++)
+ if (available_error_type_v2 & einjv2_error_type_string[pos].mask)
+ seq_printf(m, "V2_0x%08x\t%s\n", einjv2_error_type_string[pos].mask,
+ einjv2_error_type_string[pos].str);
+ }
return 0;
}

DEFINE_SHOW_ATTRIBUTE(available_error_type);

-static int error_type_get(void *data, u64 *val)
+static ssize_t error_type_get(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
{
- *val = error_type;
-
- return 0;
+ return simple_read_from_buffer(buf, count, ppos, einj_buf, strlen(einj_buf));
}

bool einj_is_cxl_error_type(u64 type)
@@ -715,9 +729,22 @@ int einj_validate_error_type(u64 type)
return 0;
}

-static int error_type_set(void *data, u64 val)
+static ssize_t error_type_set(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
int rc;
+ u64 val;
+
+ memset(einj_buf, 0, BUFF_SIZE);
+ if (copy_from_user(einj_buf, buf, count))
+ return -EFAULT;
+
+ if (strncmp(einj_buf, "V2_", 3) == 0) {
+ if (!sscanf(einj_buf, "V2_%llx", &val))
+ return -EINVAL;
+ } else
+ if (!sscanf(einj_buf, "%llx", &val))
+ return -EINVAL;

rc = einj_validate_error_type(val);
if (rc)
@@ -725,11 +752,13 @@ static int error_type_set(void *data, u64 val)

error_type = val;

- return 0;
+ return count;
}

-DEFINE_DEBUGFS_ATTRIBUTE(error_type_fops, error_type_get, error_type_set,
- "0x%llx\n");
+static const struct file_operations error_type_fops = {
+ .read = error_type_get,
+ .write = error_type_set,
+};

static int error_inject_set(void *data, u64 val)
{
@@ -737,7 +766,7 @@ static int error_inject_set(void *data, u64 val)
return -EINVAL;

return einj_error_inject(error_type, error_flags, error_param1, error_param2,
- error_param3, error_param4);
+ error_param3, error_param4);
}

DEFINE_DEBUGFS_ATTRIBUTE(error_inject_fops, NULL, error_inject_set, "%llu\n");
@@ -786,9 +815,15 @@ static int __init einj_probe(struct platform_device *pdev)
goto err_put_table;
}

- rc = einj_get_available_error_type(&available_error_type);
+ rc = einj_get_available_error_type(&available_error_type, ACPI_EINJ_GET_ERROR_TYPE);
if (rc)
return rc;
+ if (available_error_type & ACPI65_EINJV2_SUPP) {
+ rc = einj_get_available_error_type(&available_error_type_v2,
+ ACPI_EINJV2_GET_ERROR_TYPE);
+ if (rc)
+ return rc;
+ }

rc = -ENOMEM;
einj_debug_dir = debugfs_create_dir("einj", apei_get_debugfs_dir());
diff --git a/drivers/acpi/apei/einj-cxl.c b/drivers/acpi/apei/einj-cxl.c
index 78da9ae543a2..e70a416ec925 100644
--- a/drivers/acpi/apei/einj-cxl.c
+++ b/drivers/acpi/apei/einj-cxl.c
@@ -30,7 +30,7 @@ int einj_cxl_available_error_type_show(struct seq_file *m, void *v)
int cxl_err, rc;
u32 available_error_type = 0;

- rc = einj_get_available_error_type(&available_error_type);
+ rc = einj_get_available_error_type(&available_error_type, ACPI_EINJ_GET_ERROR_TYPE);
if (rc)
return rc;

--
2.34.1