[RFC PATCH v2 4/8] ACPI: APEI: EINJ: Enable the discovery of EINJv2 capabilities

[Zaid Alali <zaidal@os.amperecomputing.com>]

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     | 35 ++++++++++++++++++++++++-------
 drivers/acpi/apei/einj-cxl.c      |  2 +-
 3 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h
index cd2766c69d78..9a3dbaeed39a 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 version);
 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 b1bbbee9c664..cc5ad1f45ea4 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 version)
 {
 	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, version);
 	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 version)
 {
 	int rc;
 
 	mutex_lock(&einj_mutex);
-	rc = __einj_get_available_error_type(type);
+	rc = __einj_get_available_error_type(type, version);
 	mutex_unlock(&einj_mutex);
 
 	return rc;
@@ -647,15 +649,27 @@ static struct { u32 mask; const char *str; } const einj_error_type_string[] = {
 	{ BIT(11), "Platform Uncorrectable fatal"},
 	{ 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)
 {
 
+	seq_printf(m, "EINJ error types:\n");
 	for (int pos = 0; pos < ARRAY_SIZE(einj_error_type_string); pos++)
 		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);
-
+					   einj_error_type_string[pos].str);
+	if (available_error_type & ACPI65_EINJV2_SUPP) {
+		seq_printf(m, "EINJv2 error types:\n");
+		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, "0x%08x\t%s\n", einjv2_error_type_string[pos].mask,
+						   einjv2_error_type_string[pos].str);
+	}
 	return 0;
 }
 
@@ -692,7 +706,7 @@ int einj_validate_error_type(u64 type)
 	if (tval & (tval - 1))
 		return -EINVAL;
 	if (!vendor)
-		if (!(type & available_error_type))
+		if (!(type & (available_error_type | available_error_type_v2)))
 			return -EINVAL;
 
 	return 0;
@@ -769,9 +783,14 @@ 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 8b8be0c90709..25adc9b03d18 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