4 files changed, 194 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
index 1ff54c2c2c95..46e53da49884 100644
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -590,6 +590,25 @@ struct ath11k_board_data {
 /* IPQ8074 HW channel counters frequency value in hertz */
 #define IPQ8074_CC_FREQ_HERTZ 320000
 
+struct ath11k_bp_stats {
+	/* Head Pointer reported by the last HTT Backpressure event for the ring */
+	u16 hp;
+
+	/* Tail Pointer reported by the last HTT Backpressure event for the ring */
+	u16 tp;
+
+	/* Number of Backpressure events received for the ring */
+	u32 count;
+
+	/* Last recorded event timestamp */
+	unsigned long jiffies;
+};
+
+struct ath11k_dp_ring_bp_stats {
+	struct ath11k_bp_stats umac_ring_bp_stats[HTT_SW_UMAC_RING_IDX_MAX];
+	struct ath11k_bp_stats lmac_ring_bp_stats[HTT_SW_LMAC_RING_IDX_MAX][MAX_RADIOS];
+};
+
 struct ath11k_soc_dp_tx_err_stats {
 	/* TCL Ring Descriptor unavailable */
 	u32 desc_na[DP_TCL_NUM_RING_MAX];
@@ -606,6 +625,7 @@ struct ath11k_soc_dp_stats {
 	u32 reo_error[HAL_REO_DEST_RING_ERROR_CODE_MAX];
 	u32 hal_reo_error[DP_REO_DST_RING_MAX];
 	struct ath11k_soc_dp_tx_err_stats tx_err;
+	struct ath11k_dp_ring_bp_stats bp_stats;
 };
 
 /* Master structure to hold the hw data which may be used in core module */
diff --git a/drivers/net/wireless/ath/ath11k/debug.c b/drivers/net/wireless/ath/ath11k/debug.c
index 647d5a50043f..62a1aa0565a9 100644
--- a/drivers/net/wireless/ath/ath11k/debug.c
+++ b/drivers/net/wireless/ath/ath11k/debug.c
@@ -12,6 +12,43 @@
 #include "debug_htt_stats.h"
 #include "peer.h"
 
+static const char *htt_bp_umac_ring[HTT_SW_UMAC_RING_IDX_MAX] = {
+	"REO2SW1_RING",
+	"REO2SW2_RING",
+	"REO2SW3_RING",
+	"REO2SW4_RING",
+	"WBM2REO_LINK_RING",
+	"REO2TCL_RING",
+	"REO2FW_RING",
+	"RELEASE_RING",
+	"PPE_RELEASE_RING",
+	"TCL2TQM_RING",
+	"TQM_RELEASE_RING",
+	"REO_RELEASE_RING",
+	"WBM2SW0_RELEASE_RING",
+	"WBM2SW1_RELEASE_RING",
+	"WBM2SW2_RELEASE_RING",
+	"WBM2SW3_RELEASE_RING",
+	"REO_CMD_RING",
+	"REO_STATUS_RING",
+};
+
+static const char *htt_bp_lmac_ring[HTT_SW_LMAC_RING_IDX_MAX] = {
+	"FW2RXDMA_BUF_RING",
+	"FW2RXDMA_STATUS_RING",
+	"FW2RXDMA_LINK_RING",
+	"SW2RXDMA_BUF_RING",
+	"WBM2RXDMA_LINK_RING",
+	"RXDMA2FW_RING",
+	"RXDMA2SW_RING",
+	"RXDMA2RELEASE_RING",
+	"RXDMA2REO_RING",
+	"MONITOR_STATUS_RING",
+	"MONITOR_BUF_RING",
+	"MONITOR_DESC_RING",
+	"MONITOR_DEST_RING",
+};
+
 void ath11k_info(struct ath11k_base *ab, const char *fmt, ...)
 {
 	struct va_format vaf = {
@@ -739,6 +776,72 @@ static const struct file_operations fops_extd_rx_stats = {
 	.open = simple_open,
 };
 
+static int ath11k_fill_bp_stats(struct ath11k_base *ab,
+				struct ath11k_bp_stats *bp_stats,
+				char *buf, int len, int size)
+{
+	lockdep_assert_held(&ab->base_lock);
+
+	len += scnprintf(buf + len, size - len, "count: %u\n",
+			 bp_stats->count);
+	len += scnprintf(buf + len, size - len, "hp: %u\n",
+			 bp_stats->hp);
+	len += scnprintf(buf + len, size - len, "tp: %u\n",
+			 bp_stats->tp);
+	len += scnprintf(buf + len, size - len, "seen before: %ums\n\n",
+			 jiffies_to_msecs(jiffies - bp_stats->jiffies));
+	return len;
+}
+
+static ssize_t ath11k_debug_dump_soc_ring_bp_stats(struct ath11k_base *ab,
+						   char *buf, int size)
+{
+	struct ath11k_bp_stats *bp_stats;
+	bool stats_rxd = false;
+	u8 i, pdev_idx;
+	int len = 0;
+
+	len += scnprintf(buf + len, size - len, "\nBackpressure Stats\n");
+	len += scnprintf(buf + len, size - len, "==================\n");
+
+	spin_lock_bh(&ab->base_lock);
+	for (i = 0; i < HTT_SW_UMAC_RING_IDX_MAX; i++) {
+		bp_stats = &ab->soc_stats.bp_stats.umac_ring_bp_stats[i];
+
+		if (!bp_stats->count)
+			continue;
+
+		len += scnprintf(buf + len, size - len, "Ring: %s\n",
+				 htt_bp_umac_ring[i]);
+		len = ath11k_fill_bp_stats(ab, bp_stats, buf, len, size);
+		stats_rxd = true;
+	}
+
+	for (i = 0; i < HTT_SW_LMAC_RING_IDX_MAX; i++) {
+		for (pdev_idx = 0; pdev_idx < MAX_RADIOS; pdev_idx++) {
+			bp_stats =
+				&ab->soc_stats.bp_stats.lmac_ring_bp_stats[i][pdev_idx];
+
+			if (!bp_stats->count)
+				continue;
+
+			len += scnprintf(buf + len, size - len, "Ring: %s\n",
+					 htt_bp_lmac_ring[i]);
+			len += scnprintf(buf + len, size - len, "pdev: %d\n",
+					 pdev_idx);
+			len = ath11k_fill_bp_stats(ab, bp_stats, buf, len, size);
+			stats_rxd = true;
+		}
+	}
+	spin_unlock_bh(&ab->base_lock);
+
+	if (!stats_rxd)
+		len += scnprintf(buf + len, size - len,
+				 "No Ring Backpressure stats received\n\n");
+
+	return len;
+}
+
 static ssize_t ath11k_debug_dump_soc_dp_stats(struct file *file,
 					      char __user *user_buf,
 					      size_t count, loff_t *ppos)
@@ -799,6 +902,8 @@ static ssize_t ath11k_debug_dump_soc_dp_stats(struct file *file,
 			 "\nMisc Transmit Failures: %d\n",
 			 atomic_read(&soc_stats->tx_err.misc_fail));
 
+	len += ath11k_debug_dump_soc_ring_bp_stats(ab, buf + len, size - len);
+
 	if (len > size)
 		len = size;
 	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
diff --git a/drivers/net/wireless/ath/ath11k/dp.h b/drivers/net/wireless/ath/ath11k/dp.h
index 058a5c1d86ff..7587862d2e32 100644
--- a/drivers/net/wireless/ath/ath11k/dp.h
+++ b/drivers/net/wireless/ath/ath11k/dp.h
@@ -999,6 +999,48 @@ struct htt_resp_msg {
 #define HTT_BACKPRESSURE_EVENT_HP_M GENMASK(15, 0)
 #define HTT_BACKPRESSURE_EVENT_TP_M GENMASK(31, 16)
 
+#define HTT_BACKPRESSURE_UMAC_RING_TYPE	0
+#define HTT_BACKPRESSURE_LMAC_RING_TYPE	1
+
+enum htt_backpressure_umac_ringid {
+	HTT_SW_RING_IDX_REO_REO2SW1_RING,
+	HTT_SW_RING_IDX_REO_REO2SW2_RING,
+	HTT_SW_RING_IDX_REO_REO2SW3_RING,
+	HTT_SW_RING_IDX_REO_REO2SW4_RING,
+	HTT_SW_RING_IDX_REO_WBM2REO_LINK_RING,
+	HTT_SW_RING_IDX_REO_REO2TCL_RING,
+	HTT_SW_RING_IDX_REO_REO2FW_RING,
+	HTT_SW_RING_IDX_REO_REO_RELEASE_RING,
+	HTT_SW_RING_IDX_WBM_PPE_RELEASE_RING,
+	HTT_SW_RING_IDX_TCL_TCL2TQM_RING,
+	HTT_SW_RING_IDX_WBM_TQM_RELEASE_RING,
+	HTT_SW_RING_IDX_WBM_REO_RELEASE_RING,
+	HTT_SW_RING_IDX_WBM_WBM2SW0_RELEASE_RING,
+	HTT_SW_RING_IDX_WBM_WBM2SW1_RELEASE_RING,
+	HTT_SW_RING_IDX_WBM_WBM2SW2_RELEASE_RING,
+	HTT_SW_RING_IDX_WBM_WBM2SW3_RELEASE_RING,
+	HTT_SW_RING_IDX_REO_REO_CMD_RING,
+	HTT_SW_RING_IDX_REO_REO_STATUS_RING,
+	HTT_SW_UMAC_RING_IDX_MAX,
+};
+
+enum htt_backpressure_lmac_ringid {
+	HTT_SW_RING_IDX_FW2RXDMA_BUF_RING,
+	HTT_SW_RING_IDX_FW2RXDMA_STATUS_RING,
+	HTT_SW_RING_IDX_FW2RXDMA_LINK_RING,
+	HTT_SW_RING_IDX_SW2RXDMA_BUF_RING,
+	HTT_SW_RING_IDX_WBM2RXDMA_LINK_RING,
+	HTT_SW_RING_IDX_RXDMA2FW_RING,
+	HTT_SW_RING_IDX_RXDMA2SW_RING,
+	HTT_SW_RING_IDX_RXDMA2RELEASE_RING,
+	HTT_SW_RING_IDX_RXDMA2REO_RING,
+	HTT_SW_RING_IDX_MONITOR_STATUS_RING,
+	HTT_SW_RING_IDX_MONITOR_BUF_RING,
+	HTT_SW_RING_IDX_MONITOR_DESC_RING,
+	HTT_SW_RING_IDX_MONITOR_DEST_RING,
+	HTT_SW_LMAC_RING_IDX_MAX,
+};
+
 /* ppdu stats
  *
  * @details
diff --git a/drivers/net/wireless/ath/ath11k/dp_rx.c b/drivers/net/wireless/ath/ath11k/dp_rx.c
index a9cc1a457c33..791d971784ce 100644
--- a/drivers/net/wireless/ath/ath11k/dp_rx.c
+++ b/drivers/net/wireless/ath/ath11k/dp_rx.c
@@ -1501,9 +1501,10 @@ static void ath11k_htt_backpressure_event_handler(struct ath11k_base *ab,
 						  struct sk_buff *skb)
 {
 	u32 *data = (u32 *)skb->data;
-	u8 pdev_id, ring_type, ring_id;
+	u8 pdev_id, ring_type, ring_id, pdev_idx;
 	u16 hp, tp;
 	u32 backpressure_time;
+	struct ath11k_bp_stats *bp_stats;
 
 	pdev_id = FIELD_GET(HTT_BACKPRESSURE_EVENT_PDEV_ID_M, *data);
 	ring_type = FIELD_GET(HTT_BACKPRESSURE_EVENT_RING_TYPE_M, *data);
@@ -1518,6 +1519,31 @@ static void ath11k_htt_backpressure_event_handler(struct ath11k_base *ab,
 
 	ath11k_dbg(ab, ATH11K_DBG_DP_HTT, "htt backpressure event, pdev %d, ring type %d,ring id %d, hp %d tp %d, backpressure time %d\n",
 		   pdev_id, ring_type, ring_id, hp, tp, backpressure_time);
+
+	if (ring_type == HTT_BACKPRESSURE_UMAC_RING_TYPE) {
+		if (ring_id >= HTT_SW_UMAC_RING_IDX_MAX)
+			return;
+
+		bp_stats = &ab->soc_stats.bp_stats.umac_ring_bp_stats[ring_id];
+	} else if (ring_type == HTT_BACKPRESSURE_LMAC_RING_TYPE) {
+		pdev_idx = DP_HW2SW_MACID(pdev_id);
+
+		if (ring_id >= HTT_SW_LMAC_RING_IDX_MAX || pdev_idx >= MAX_RADIOS)
+			return;
+
+		bp_stats = &ab->soc_stats.bp_stats.lmac_ring_bp_stats[ring_id][pdev_idx];
+	} else {
+		ath11k_warn(ab, "unknown ring type received in htt bp event %d\n",
+			    ring_type);
+		return;
+	}
+
+	spin_lock_bh(&ab->base_lock);
+	bp_stats->hp = hp;
+	bp_stats->tp = tp;
+	bp_stats->count++;
+	bp_stats->jiffies = jiffies;
+	spin_unlock_bh(&ab->base_lock);
 }
 
 void ath11k_dp_htt_htc_t2h_msg_handler(struct ath11k_base *ab,