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From: Ramya Gnanasekar <quic_rgnanase@quicinc.com>
To: ath12k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org,
        Dinesh Karthikeyan <quic_dinek@quicinc.com>,
        Ramya Gnanasekar <quic_rgnanase@quicinc.com>
Subject: [PATCH 2/4] wifi: ath12k: Add htt_stats_dump file ops support
Date: Mon, 29 Apr 2024 23:08:23 +0530
Message-Id: <20240429173825.2369355-3-quic_rgnanase@quicinc.com>
In-Reply-To: <20240429173825.2369355-1-quic_rgnanase@quicinc.com>
References: <20240429173825.2369355-1-quic_rgnanase@quicinc.com>
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From: Dinesh Karthikeyan <quic_dinek@quicinc.com>

Add dump_htt_stats file operation to dump the stats value requested
for the requested stats_type.
Stats sent from firmware will be cumulative. Hence add debugfs to reset
the requested stats type.

Example with one ath12k device:

ath12k
`-- pci-0000:06:00.0
    |-- mac0
        `-- htt_stats
        |-- htt_stats_type
        |-- htt_stats_reset

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1

Signed-off-by: Dinesh Karthikeyan <quic_dinek@quicinc.com>
Co-developed-by: Ramya Gnanasekar <quic_rgnanase@quicinc.com>
Signed-off-by: Ramya Gnanasekar <quic_rgnanase@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/core.h        |   2 +
 .../wireless/ath/ath12k/debugfs_htt_stats.c   | 201 ++++++++++++++++++
 .../wireless/ath/ath12k/debugfs_htt_stats.h   |  30 +++
 3 files changed, 233 insertions(+)

diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index b7aa2d69aed3..192182a062bc 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -481,6 +481,8 @@ struct ath12k_fw_stats {
 struct ath12k_dbg_htt_stats {
 	enum ath12k_dbg_htt_ext_stats_type type;
 	u32 cfg_param[4];
+	u8 reset;
+	struct debug_htt_stats_req *stats_req;
 	/* protects shared stats req buffer */
 	spinlock_t lock;
 };
diff --git a/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c b/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c
index 4a58362bdaea..d69586506d68 100644
--- a/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c
+++ b/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.c
@@ -8,6 +8,7 @@
 #include "core.h"
 #include "debug.h"
 #include "debugfs_htt_stats.h"
+#include "dp_tx.h"
 
 static ssize_t ath12k_read_htt_stats_type(struct file *file,
 					  char __user *user_buf,
@@ -66,9 +67,209 @@ static const struct file_operations fops_htt_stats_type = {
 	.llseek = default_llseek,
 };
 
+static int ath12k_debugfs_htt_stats_req(struct ath12k *ar)
+{
+	struct debug_htt_stats_req *stats_req = ar->debug.htt_stats.stats_req;
+	enum ath12k_dbg_htt_ext_stats_type type = stats_req->type;
+	u64 cookie;
+	int ret, pdev_id = ar->pdev->pdev_id;
+	struct htt_ext_stats_cfg_params cfg_params = { 0 };
+
+	init_completion(&stats_req->htt_stats_rcvd);
+
+	stats_req->done = false;
+	stats_req->pdev_id = pdev_id;
+
+	cookie = u64_encode_bits(ATH12K_HTT_STATS_MAGIC_VALUE,
+				 ATH12K_HTT_STATS_COOKIE_MSB);
+	cookie |= u64_encode_bits(pdev_id, ATH12K_HTT_STATS_COOKIE_LSB);
+
+	if (stats_req->override_cfg_param) {
+		cfg_params.cfg0 = stats_req->cfg_param[0];
+		cfg_params.cfg1 = stats_req->cfg_param[1];
+		cfg_params.cfg2 = stats_req->cfg_param[2];
+		cfg_params.cfg3 = stats_req->cfg_param[3];
+	}
+
+	ret = ath12k_dp_tx_htt_h2t_ext_stats_req(ar, type, &cfg_params, cookie);
+	if (ret) {
+		ath12k_warn(ar->ab, "failed to send htt stats request: %d\n", ret);
+		return ret;
+	}
+	if (!wait_for_completion_timeout(&stats_req->htt_stats_rcvd, 3 * HZ)) {
+		spin_lock_bh(&ar->debug.htt_stats.lock);
+		if (!stats_req->done) {
+			stats_req->done = true;
+			spin_unlock_bh(&ar->debug.htt_stats.lock);
+			ath12k_warn(ar->ab, "stats request timed out\n");
+			return -ETIMEDOUT;
+		}
+		spin_unlock_bh(&ar->debug.htt_stats.lock);
+	}
+
+	return 0;
+}
+
+static int ath12k_open_htt_stats(struct inode *inode,
+				 struct file *file)
+{
+	struct ath12k *ar = inode->i_private;
+	struct debug_htt_stats_req *stats_req;
+	enum ath12k_dbg_htt_ext_stats_type type = ar->debug.htt_stats.type;
+	int ret;
+
+	if (type == ATH12K_DBG_HTT_EXT_STATS_RESET)
+		return -EPERM;
+
+	mutex_lock(&ar->conf_mutex);
+
+	if (ar->state != ATH12K_STATE_ON) {
+		ret = -ENETDOWN;
+		goto err_unlock;
+	}
+
+	if (ar->debug.htt_stats.stats_req) {
+		ret = -EAGAIN;
+		goto err_unlock;
+	}
+
+	stats_req = kzalloc(sizeof(*stats_req) + ATH12K_HTT_STATS_BUF_SIZE, GFP_KERNEL);
+	if (!stats_req) {
+		ret = -ENOMEM;
+		goto err_unlock;
+	}
+
+	ar->debug.htt_stats.stats_req = stats_req;
+	stats_req->type = type;
+	stats_req->cfg_param[0] = ar->debug.htt_stats.cfg_param[0];
+	stats_req->cfg_param[1] = ar->debug.htt_stats.cfg_param[1];
+	stats_req->cfg_param[2] = ar->debug.htt_stats.cfg_param[2];
+	stats_req->cfg_param[3] = ar->debug.htt_stats.cfg_param[3];
+	stats_req->override_cfg_param = !!stats_req->cfg_param[0] ||
+					!!stats_req->cfg_param[1] ||
+					!!stats_req->cfg_param[2] ||
+					!!stats_req->cfg_param[3];
+
+	ret = ath12k_debugfs_htt_stats_req(ar);
+	if (ret < 0)
+		goto out;
+
+	file->private_data = stats_req;
+
+	mutex_unlock(&ar->conf_mutex);
+
+	return 0;
+out:
+	kfree(stats_req);
+	ar->debug.htt_stats.stats_req = NULL;
+err_unlock:
+	mutex_unlock(&ar->conf_mutex);
+
+	return ret;
+}
+
+static int ath12k_release_htt_stats(struct inode *inode,
+				    struct file *file)
+{
+	struct ath12k *ar = inode->i_private;
+
+	mutex_lock(&ar->conf_mutex);
+	kfree(file->private_data);
+	ar->debug.htt_stats.stats_req = NULL;
+	mutex_unlock(&ar->conf_mutex);
+
+	return 0;
+}
+
+static ssize_t ath12k_read_htt_stats(struct file *file,
+				     char __user *user_buf,
+				     size_t count, loff_t *ppos)
+{
+	struct debug_htt_stats_req *stats_req = file->private_data;
+	char *buf;
+	u32 length;
+
+	buf = stats_req->buf;
+	length = min_t(u32, stats_req->buf_len, ATH12K_HTT_STATS_BUF_SIZE);
+	return simple_read_from_buffer(user_buf, count, ppos, buf, length);
+}
+
+static const struct file_operations fops_dump_htt_stats = {
+	.open = ath12k_open_htt_stats,
+	.release = ath12k_release_htt_stats,
+	.read = ath12k_read_htt_stats,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
+static ssize_t ath12k_write_htt_stats_reset(struct file *file,
+					    const char __user *user_buf,
+					    size_t count, loff_t *ppos)
+{
+	struct ath12k *ar = file->private_data;
+	enum ath12k_dbg_htt_ext_stats_type type;
+	struct htt_ext_stats_cfg_params cfg_params = { 0 };
+	u8 param_pos;
+	int ret;
+
+	ret = kstrtou32_from_user(user_buf, count, 0, &type);
+	if (ret)
+		return ret;
+
+	if (type >= ATH12K_DBG_HTT_NUM_EXT_STATS ||
+	    type == ATH12K_DBG_HTT_EXT_STATS_RESET)
+		return -E2BIG;
+
+	mutex_lock(&ar->conf_mutex);
+	cfg_params.cfg0 = HTT_STAT_DEFAULT_RESET_START_OFFSET;
+	param_pos = (type >> 5) + 1;
+
+	switch (param_pos) {
+	case ATH12K_HTT_STATS_RESET_PARAM_CFG_32_BYTES:
+		cfg_params.cfg1 = 1 << (cfg_params.cfg0 + type);
+		break;
+	case ATH12K_HTT_STATS_RESET_PARAM_CFG_64_BYTES:
+		cfg_params.cfg2 = ATH12K_HTT_STATS_RESET_BITMAP32_BIT(cfg_params.cfg0 +
+								      type);
+		break;
+	case ATH12K_HTT_STATS_RESET_PARAM_CFG_128_BYTES:
+		cfg_params.cfg3 = ATH12K_HTT_STATS_RESET_BITMAP64_BIT(cfg_params.cfg0 +
+								      type);
+		break;
+	default:
+		break;
+	}
+
+	ret = ath12k_dp_tx_htt_h2t_ext_stats_req(ar,
+						 ATH12K_DBG_HTT_EXT_STATS_RESET,
+						 &cfg_params,
+						 0ULL);
+	if (ret) {
+		ath12k_warn(ar->ab, "failed to send htt stats request: %d\n", ret);
+		mutex_unlock(&ar->conf_mutex);
+		return ret;
+	}
+
+	ar->debug.htt_stats.reset = type;
+	mutex_unlock(&ar->conf_mutex);
+
+	return count;
+}
+
+static const struct file_operations fops_htt_stats_reset = {
+	.write = ath12k_write_htt_stats_reset,
+	.open = simple_open,
+	.owner = THIS_MODULE,
+	.llseek = default_llseek,
+};
+
 void ath12k_debugfs_htt_stats_init(struct ath12k *ar)
 {
 	spin_lock_init(&ar->debug.htt_stats.lock);
 	debugfs_create_file("htt_stats_type", 0600, ar->debug.debugfs_pdev,
 			    ar, &fops_htt_stats_type);
+	debugfs_create_file("htt_stats", 0400, ar->debug.debugfs_pdev,
+			    ar, &fops_dump_htt_stats);
+	debugfs_create_file("htt_stats_reset", 0200, ar->debug.debugfs_pdev,
+			    ar, &fops_htt_stats_reset);
 }
diff --git a/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.h b/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.h
index 6bd34d72b407..eade49d91720 100644
--- a/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.h
+++ b/drivers/net/wireless/ath/ath12k/debugfs_htt_stats.h
@@ -7,6 +7,18 @@
 #ifndef DEBUG_HTT_STATS_H
 #define DEBUG_HTT_STATS_H
 
+#define ATH12K_HTT_STATS_BUF_SIZE		(1024 * 512)
+#define ATH12K_HTT_STATS_COOKIE_LSB		GENMASK_ULL(31, 0)
+#define ATH12K_HTT_STATS_COOKIE_MSB		GENMASK_ULL(63, 32)
+#define ATH12K_HTT_STATS_MAGIC_VALUE		0xF0F0F0F0
+
+#define ATH12K_HTT_STATS_RESET_BITMAP32_OFFSET(_idx)	((_idx) & 0x1f)
+#define ATH12K_HTT_STATS_RESET_BITMAP64_OFFSET(_idx)	((_idx) & 0x3f)
+#define ATH12K_HTT_STATS_RESET_BITMAP32_BIT(_idx)	(1 << \
+		ATH12K_HTT_STATS_RESET_BITMAP32_OFFSET(_idx))
+#define ATH12K_HTT_STATS_RESET_BITMAP64_BIT(_idx)	(1 << \
+		ATH12K_HTT_STATS_RESET_BITMAP64_OFFSET(_idx))
+
 void ath12k_debugfs_htt_stats_init(struct ath12k *ar);
 
 /* htt_dbg_ext_stats_type */
@@ -17,4 +29,22 @@ enum ath12k_dbg_htt_ext_stats_type {
 	ATH12K_DBG_HTT_NUM_EXT_STATS,
 };
 
+enum ath12k_htt_stats_reset_cfg_param_alloc_pos {
+	ATH12K_HTT_STATS_RESET_PARAM_CFG_32_BYTES = 1,
+	ATH12K_HTT_STATS_RESET_PARAM_CFG_64_BYTES,
+	ATH12K_HTT_STATS_RESET_PARAM_CFG_128_BYTES,
+};
+
+struct debug_htt_stats_req {
+	bool done;
+	bool override_cfg_param;
+	u8 pdev_id;
+	enum ath12k_dbg_htt_ext_stats_type type;
+	u32 cfg_param[4];
+	u8 peer_addr[ETH_ALEN];
+	struct completion htt_stats_rcvd;
+	u32 buf_len;
+	u8 buf[];
+};
+
 #endif
-- 
2.34.1