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Message-ID: <20241009124120.1124-12-shiju.jose@huawei.com>
Date: Wed, 9 Oct 2024 13:41:12 +0100
From: <shiju.jose@...wei.com>
To: <linux-edac@...r.kernel.org>, <linux-cxl@...r.kernel.org>,
	<linux-acpi@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
CC: <bp@...en8.de>, <tony.luck@...el.com>, <rafael@...nel.org>,
	<lenb@...nel.org>, <mchehab@...nel.org>, <dan.j.williams@...el.com>,
	<dave@...olabs.net>, <jonathan.cameron@...wei.com>, <dave.jiang@...el.com>,
	<alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
	<ira.weiny@...el.com>, <david@...hat.com>, <Vilas.Sridharan@....com>,
	<leo.duran@....com>, <Yazen.Ghannam@....com>, <rientjes@...gle.com>,
	<jiaqiyan@...gle.com>, <Jon.Grimm@....com>, <dave.hansen@...ux.intel.com>,
	<naoya.horiguchi@....com>, <james.morse@....com>, <jthoughton@...gle.com>,
	<somasundaram.a@....com>, <erdemaktas@...gle.com>, <pgonda@...gle.com>,
	<duenwen@...gle.com>, <gthelen@...gle.com>, <wschwartz@...erecomputing.com>,
	<dferguson@...erecomputing.com>, <wbs@...amperecomputing.com>,
	<nifan.cxl@...il.com>, <yazen.ghannam@....com>, <tanxiaofei@...wei.com>,
	<prime.zeng@...ilicon.com>, <roberto.sassu@...wei.com>,
	<kangkang.shen@...urewei.com>, <wanghuiqiang@...wei.com>,
	<linuxarm@...wei.com>, <shiju.jose@...wei.com>
Subject: [PATCH v13 11/18] cxl/memfeature: Add CXL memory device ECS control feature

From: Shiju Jose <shiju.jose@...wei.com>

CXL spec 3.1 section 8.2.9.9.11.2 describes the DDR5 ECS (Error Check
Scrub) control feature.
The Error Check Scrub (ECS) is a feature defined in JEDEC DDR5 SDRAM
Specification (JESD79-5) and allows the DRAM to internally read, correct
single-bit errors, and write back corrected data bits to the DRAM array
while providing transparency to error counts.

The ECS control allows the requester to change the log entry type, the ECS
threshold count provided that the request is within the definition
specified in DDR5 mode registers, change mode between codeword mode and
row count mode, and reset the ECS counter.

Register with EDAC device driver, which gets the ECS attr descriptors
from the EDAC ECS and expose sysfs ECS control attributes to userspace.
For example ECS control for the memory media FRU 0 in CXL mem0 device is
in /sys/bus/edac/devices/cxl_mem0/ecs_fruX/

Signed-off-by: Shiju Jose <shiju.jose@...wei.com>
---
 drivers/cxl/core/memfeature.c | 467 +++++++++++++++++++++++++++++++++-
 1 file changed, 461 insertions(+), 6 deletions(-)

diff --git a/drivers/cxl/core/memfeature.c b/drivers/cxl/core/memfeature.c
index 84d6e887a4fa..567406566c77 100644
--- a/drivers/cxl/core/memfeature.c
+++ b/drivers/cxl/core/memfeature.c
@@ -19,7 +19,7 @@
 #include <cxl.h>
 #include <linux/edac.h>
 
-#define CXL_DEV_NUM_RAS_FEATURES	1
+#define CXL_DEV_NUM_RAS_FEATURES	2
 #define CXL_DEV_HOUR_IN_SECS	3600
 
 #define CXL_SCRUB_NAME_LEN	128
@@ -309,6 +309,420 @@ static const struct edac_scrub_ops cxl_ps_scrub_ops = {
 	.set_cycle_duration = cxl_patrol_scrub_write_scrub_cycle,
 };
 
+/* CXL DDR5 ECS control definitions */
+static const uuid_t cxl_ecs_uuid =
+	UUID_INIT(0xe5b13f22, 0x2328, 0x4a14, 0xb8, 0xba, 0xb9, 0x69, 0x1e,     \
+		  0x89, 0x33, 0x86);
+
+struct cxl_ecs_context {
+	u16 num_media_frus;
+	u16 get_feat_size;
+	u16 set_feat_size;
+	u8 get_version;
+	u8 set_version;
+	u16 set_effects;
+	struct cxl_memdev *cxlmd;
+};
+
+enum {
+	CXL_ECS_PARAM_LOG_ENTRY_TYPE,
+	CXL_ECS_PARAM_THRESHOLD,
+	CXL_ECS_PARAM_MODE,
+	CXL_ECS_PARAM_RESET_COUNTER,
+};
+
+#define	CXL_ECS_LOG_ENTRY_TYPE_MASK	GENMASK(1, 0)
+#define	CXL_ECS_REALTIME_REPORT_CAP_MASK	BIT(0)
+#define	CXL_ECS_THRESHOLD_COUNT_MASK	GENMASK(2, 0)
+#define	CXL_ECS_MODE_MASK	BIT(3)
+#define	CXL_ECS_RESET_COUNTER_MASK	BIT(4)
+
+static const u16 ecs_supp_threshold[] = { 0, 0, 0, 256, 1024, 4096 };
+
+enum {
+	ECS_LOG_ENTRY_TYPE_DRAM = 0x0,
+	ECS_LOG_ENTRY_TYPE_MEM_MEDIA_FRU = 0x1,
+};
+
+enum {
+	ECS_THRESHOLD_256 = 3,
+	ECS_THRESHOLD_1024 = 4,
+	ECS_THRESHOLD_4096 = 5,
+};
+
+enum cxl_ecs_mode {
+	ECS_MODE_COUNTS_ROWS = 0,
+	ECS_MODE_COUNTS_CODEWORDS = 1,
+};
+
+/**
+ * struct cxl_ecs_params - CXL memory DDR5 ECS parameter data structure.
+ * @log_entry_type: ECS log entry type, per DRAM or per memory media FRU.
+ * @threshold: ECS threshold count per GB of memory cells.
+ * @mode:	codeword/row count mode
+ *		0 : ECS counts rows with errors
+ *		1 : ECS counts codeword with errors
+ * @reset_counter: [IN] reset ECC counter to default value.
+ */
+struct cxl_ecs_params {
+	u8 log_entry_type;
+	u16 threshold;
+	enum cxl_ecs_mode mode;
+	bool reset_counter;
+};
+
+struct cxl_ecs_fru_rd_attrs {
+	u8 ecs_cap;
+	__le16 ecs_config;
+	u8 ecs_flags;
+}  __packed;
+
+struct cxl_ecs_rd_attrs {
+	u8 ecs_log_cap;
+	struct cxl_ecs_fru_rd_attrs fru_attrs[];
+}  __packed;
+
+struct cxl_ecs_fru_wr_attrs {
+	__le16 ecs_config;
+} __packed;
+
+struct cxl_ecs_wr_attrs {
+	u8 ecs_log_cap;
+	struct cxl_ecs_fru_wr_attrs fru_attrs[];
+}  __packed;
+
+/* CXL DDR5 ECS control functions */
+static int cxl_mem_ecs_get_attrs(struct device *dev, void *drv_data, int fru_id,
+				 struct cxl_ecs_params *params)
+{
+	struct cxl_ecs_context *cxl_ecs_ctx = drv_data;
+	struct cxl_memdev *cxlmd = cxl_ecs_ctx->cxlmd;
+	struct cxl_dev_state *cxlds = cxlmd->cxlds;
+	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds);
+	struct cxl_ecs_fru_rd_attrs *fru_rd_attrs;
+	size_t rd_data_size;
+	u8 threshold_index;
+	size_t data_size;
+
+	rd_data_size = cxl_ecs_ctx->get_feat_size;
+
+	struct cxl_ecs_rd_attrs *rd_attrs __free(kfree) =
+					kmalloc(rd_data_size, GFP_KERNEL);
+	if (!rd_attrs)
+		return -ENOMEM;
+
+	params->log_entry_type = 0;
+	params->threshold = 0;
+	params->mode = 0;
+	data_size = cxl_get_feature(mds, cxl_ecs_uuid,
+				    CXL_GET_FEAT_SEL_CURRENT_VALUE,
+				    rd_attrs, rd_data_size);
+	if (!data_size)
+		return -EIO;
+
+	fru_rd_attrs = rd_attrs->fru_attrs;
+	params->log_entry_type = FIELD_GET(CXL_ECS_LOG_ENTRY_TYPE_MASK,
+					   rd_attrs->ecs_log_cap);
+	threshold_index = FIELD_GET(CXL_ECS_THRESHOLD_COUNT_MASK,
+				    fru_rd_attrs[fru_id].ecs_config);
+	params->threshold = ecs_supp_threshold[threshold_index];
+	params->mode = FIELD_GET(CXL_ECS_MODE_MASK,
+				 fru_rd_attrs[fru_id].ecs_config);
+	return 0;
+}
+
+static int cxl_mem_ecs_set_attrs(struct device *dev, void *drv_data, int fru_id,
+				 struct cxl_ecs_params *params, u8 param_type)
+{
+	struct cxl_ecs_context *cxl_ecs_ctx = drv_data;
+	struct cxl_memdev *cxlmd = cxl_ecs_ctx->cxlmd;
+	struct cxl_dev_state *cxlds = cxlmd->cxlds;
+	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds);
+	struct cxl_ecs_fru_rd_attrs *fru_rd_attrs;
+	struct cxl_ecs_fru_wr_attrs *fru_wr_attrs;
+	size_t rd_data_size, wr_data_size;
+	u16 num_media_frus, count;
+	size_t data_size;
+	int ret;
+
+	num_media_frus = cxl_ecs_ctx->num_media_frus;
+	rd_data_size = cxl_ecs_ctx->get_feat_size;
+	wr_data_size = cxl_ecs_ctx->set_feat_size;
+	struct cxl_ecs_rd_attrs *rd_attrs __free(kfree) =
+				kmalloc(rd_data_size, GFP_KERNEL);
+	if (!rd_attrs)
+		return -ENOMEM;
+
+	data_size = cxl_get_feature(mds, cxl_ecs_uuid,
+				    CXL_GET_FEAT_SEL_CURRENT_VALUE,
+				    rd_attrs, rd_data_size);
+	if (!data_size)
+		return -EIO;
+	struct cxl_ecs_wr_attrs *wr_attrs __free(kfree) =
+					kmalloc(wr_data_size, GFP_KERNEL);
+	if (!wr_attrs)
+		return -ENOMEM;
+
+	/* Fill writable attributes from the current attributes read
+	 * for all the media FRUs.
+	 */
+	fru_rd_attrs = rd_attrs->fru_attrs;
+	fru_wr_attrs = wr_attrs->fru_attrs;
+	wr_attrs->ecs_log_cap = rd_attrs->ecs_log_cap;
+	for (count = 0; count < num_media_frus; count++)
+		fru_wr_attrs[count].ecs_config = fru_rd_attrs[count].ecs_config;
+
+	/* Fill attribute to be set for the media FRU */
+	switch (param_type) {
+	case CXL_ECS_PARAM_LOG_ENTRY_TYPE:
+		if (params->log_entry_type != ECS_LOG_ENTRY_TYPE_DRAM &&
+		    params->log_entry_type != ECS_LOG_ENTRY_TYPE_MEM_MEDIA_FRU) {
+			dev_err(dev,
+				"Invalid CXL ECS scrub log entry type(%d) to set\n",
+			       params->log_entry_type);
+			dev_err(dev,
+				"Log Entry Type 0: per DRAM  1: per Memory Media FRU\n");
+			return -EINVAL;
+		}
+		wr_attrs->ecs_log_cap = FIELD_PREP(CXL_ECS_LOG_ENTRY_TYPE_MASK,
+						   params->log_entry_type);
+		break;
+	case CXL_ECS_PARAM_THRESHOLD:
+		fru_wr_attrs[fru_id].ecs_config &= ~CXL_ECS_THRESHOLD_COUNT_MASK;
+		switch (params->threshold) {
+		case 256:
+			fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_THRESHOLD_COUNT_MASK,
+								  ECS_THRESHOLD_256);
+			break;
+		case 1024:
+			fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_THRESHOLD_COUNT_MASK,
+								  ECS_THRESHOLD_1024);
+			break;
+		case 4096:
+			fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_THRESHOLD_COUNT_MASK,
+								  ECS_THRESHOLD_4096);
+			break;
+		default:
+			dev_err(dev,
+				"Invalid CXL ECS scrub threshold count(%d) to set\n",
+				params->threshold);
+			dev_err(dev,
+				"Supported scrub threshold counts: 256,1024,4096\n");
+			return -EINVAL;
+		}
+		break;
+	case CXL_ECS_PARAM_MODE:
+		if (params->mode != ECS_MODE_COUNTS_ROWS &&
+		    params->mode != ECS_MODE_COUNTS_CODEWORDS) {
+			dev_err(dev,
+				"Invalid CXL ECS scrub mode(%d) to set\n",
+				params->mode);
+			dev_err(dev,
+				"Supported ECS Modes: 0: ECS counts rows with errors,"
+				" 1: ECS counts codewords with errors\n");
+			return -EINVAL;
+		}
+		fru_wr_attrs[fru_id].ecs_config &= ~CXL_ECS_MODE_MASK;
+		fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_MODE_MASK,
+							      params->mode);
+		break;
+	case CXL_ECS_PARAM_RESET_COUNTER:
+		fru_wr_attrs[fru_id].ecs_config &= ~CXL_ECS_RESET_COUNTER_MASK;
+		fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_RESET_COUNTER_MASK,
+							      params->reset_counter);
+		break;
+	default:
+		dev_err(dev, "Invalid CXL ECS parameter to set\n");
+		return -EINVAL;
+	}
+
+	ret = cxl_set_feature(mds, cxl_ecs_uuid, cxl_ecs_ctx->set_version,
+			      wr_attrs, wr_data_size,
+			      CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET);
+	if (ret) {
+		dev_err(dev, "CXL ECS set feature failed ret=%d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cxl_ecs_get_log_entry_type(struct device *dev, void *drv_data,
+				      int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	*val = params.log_entry_type;
+
+	return 0;
+}
+
+static int cxl_ecs_set_log_entry_type(struct device *dev, void *drv_data,
+				      int fru_id, u32 val)
+{
+	struct cxl_ecs_params params = {
+		.log_entry_type = val,
+	};
+
+	return cxl_mem_ecs_set_attrs(dev, drv_data, fru_id,
+				     &params, CXL_ECS_PARAM_LOG_ENTRY_TYPE);
+}
+
+static int cxl_ecs_get_log_entry_type_per_dram(struct device *dev, void *drv_data,
+					       int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	if (params.log_entry_type == ECS_LOG_ENTRY_TYPE_DRAM)
+		*val = 1;
+	else
+		*val = 0;
+
+	return 0;
+}
+
+static int cxl_ecs_get_log_entry_type_per_memory_media(struct device *dev,
+						       void *drv_data,
+						       int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	if (params.log_entry_type == ECS_LOG_ENTRY_TYPE_MEM_MEDIA_FRU)
+		*val = 1;
+	else
+		*val = 0;
+
+	return 0;
+}
+
+static int cxl_ecs_get_mode(struct device *dev, void *drv_data,
+			    int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	*val = params.mode;
+
+	return 0;
+}
+
+static int cxl_ecs_set_mode(struct device *dev, void *drv_data,
+			    int fru_id, u32 val)
+{
+	struct cxl_ecs_params params = {
+		.mode = val,
+	};
+
+	return cxl_mem_ecs_set_attrs(dev, drv_data, fru_id,
+				     &params, CXL_ECS_PARAM_MODE);
+}
+
+static int cxl_ecs_get_mode_counts_rows(struct device *dev, void *drv_data,
+					int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	if (params.mode == ECS_MODE_COUNTS_ROWS)
+		*val = 1;
+	else
+		*val = 0;
+
+	return 0;
+}
+
+static int cxl_ecs_get_mode_counts_codewords(struct device *dev, void *drv_data,
+					     int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	if (params.mode == ECS_MODE_COUNTS_CODEWORDS)
+		*val = 1;
+	else
+		*val = 0;
+
+	return 0;
+}
+
+static int cxl_ecs_reset(struct device *dev, void *drv_data, int fru_id, u32 val)
+{
+	struct cxl_ecs_params params = {
+		.reset_counter = val,
+	};
+
+	return cxl_mem_ecs_set_attrs(dev, drv_data, fru_id,
+				     &params, CXL_ECS_PARAM_RESET_COUNTER);
+}
+
+static int cxl_ecs_get_threshold(struct device *dev, void *drv_data,
+				 int fru_id, u32 *val)
+{
+	struct cxl_ecs_params params;
+	int ret;
+
+	ret = cxl_mem_ecs_get_attrs(dev, drv_data, fru_id, &params);
+	if (ret)
+		return ret;
+
+	*val = params.threshold;
+
+	return 0;
+}
+
+static int cxl_ecs_set_threshold(struct device *dev, void *drv_data,
+				 int fru_id, u32 val)
+{
+	struct cxl_ecs_params params = {
+		.threshold = val,
+	};
+
+	return cxl_mem_ecs_set_attrs(dev, drv_data, fru_id,
+				     &params, CXL_ECS_PARAM_THRESHOLD);
+}
+
+static const struct edac_ecs_ops cxl_ecs_ops = {
+	.get_log_entry_type = cxl_ecs_get_log_entry_type,
+	.set_log_entry_type = cxl_ecs_set_log_entry_type,
+	.get_log_entry_type_per_dram = cxl_ecs_get_log_entry_type_per_dram,
+	.get_log_entry_type_per_memory_media =
+				cxl_ecs_get_log_entry_type_per_memory_media,
+	.get_mode = cxl_ecs_get_mode,
+	.set_mode = cxl_ecs_set_mode,
+	.get_mode_counts_codewords = cxl_ecs_get_mode_counts_codewords,
+	.get_mode_counts_rows = cxl_ecs_get_mode_counts_rows,
+	.reset = cxl_ecs_reset,
+	.get_threshold = cxl_ecs_get_threshold,
+	.set_threshold = cxl_ecs_set_threshold,
+};
+
 int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr)
 {
 	struct edac_dev_feature ras_features[CXL_DEV_NUM_RAS_FEATURES];
@@ -317,7 +731,9 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr)
 	struct cxl_patrol_scrub_context *cxl_ps_ctx;
 	struct cxl_feat_entry feat_entry;
 	char cxl_dev_name[CXL_SCRUB_NAME_LEN];
+	struct cxl_ecs_context *cxl_ecs_ctx;
 	int rc, i, num_ras_features = 0;
+	int num_media_frus;
 	u8 scrub_inst = 0;
 
 	if (cxlr) {
@@ -343,16 +759,18 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr)
 		rc = cxl_get_supported_feature_entry(mds, &cxl_patrol_scrub_uuid,
 						     &feat_entry);
 		if (rc < 0)
-			return rc;
+			goto feat_ecs;
 
 		if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE))
-			return -EOPNOTSUPP;
+			goto feat_ecs;
 	}
 
 	cxl_ps_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_ps_ctx), GFP_KERNEL);
-	if (!cxl_ps_ctx)
-		return -ENOMEM;
-
+	if (!cxl_ps_ctx) {
+		if (cxlr)
+			return -ENOMEM;
+		goto feat_ecs;
+	}
 	*cxl_ps_ctx = (struct cxl_patrol_scrub_context) {
 		.get_feat_size = feat_entry.get_feat_size,
 		.set_feat_size = feat_entry.set_feat_size,
@@ -377,6 +795,43 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr)
 	ras_features[num_ras_features].ctx = cxl_ps_ctx;
 	num_ras_features++;
 
+feat_ecs:
+	if (!cxlr) {
+		rc = cxl_get_supported_feature_entry(mds, &cxl_ecs_uuid,
+						     &feat_entry);
+		if (rc < 0)
+			goto feat_register;
+
+		if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE))
+			goto feat_register;
+		num_media_frus = (feat_entry.get_feat_size - sizeof(struct cxl_ecs_rd_attrs)) /
+					sizeof(struct cxl_ecs_fru_rd_attrs);
+		if (!num_media_frus)
+			goto feat_register;
+
+		cxl_ecs_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_ecs_ctx),
+					   GFP_KERNEL);
+		if (!cxl_ecs_ctx)
+			goto feat_register;
+		*cxl_ecs_ctx = (struct cxl_ecs_context) {
+			.get_feat_size = feat_entry.get_feat_size,
+			.set_feat_size = feat_entry.set_feat_size,
+			.get_version = feat_entry.get_feat_ver,
+			.set_version = feat_entry.set_feat_ver,
+			.set_effects = feat_entry.set_effects,
+			.num_media_frus = num_media_frus,
+			.cxlmd = cxlmd,
+		};
+
+		ras_features[num_ras_features].ft_type = RAS_FEAT_ECS;
+		ras_features[num_ras_features].ecs_ops = &cxl_ecs_ops;
+		ras_features[num_ras_features].ctx = cxl_ecs_ctx;
+		ras_features[num_ras_features].ecs_info.num_media_frus =
+								num_media_frus;
+		num_ras_features++;
+	}
+
+feat_register:
 	return edac_dev_register(&cxlmd->dev, cxl_dev_name, NULL,
 				 num_ras_features, ras_features);
 }
-- 
2.34.1


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