wil6210: [DEBUG] allow to query Rx and all Tx VRING descriptors

Expand debug capabilities to query all Tx/Rx descriptors. Usefull to analyse
various hardware/software stall situations. Printed is whole descriptor content
and the frame itself.

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 32 insertions, 8 deletions

diff --git a/drivers/net/wireless/ath/wil6210/debugfs.c b/drivers/net/wireless/ath/wil6210/debugfs.c
index 1caa31992a7e..74bb427ce303 100644
--- a/drivers/net/wireless/ath/wil6210/debugfs.c
+++ b/drivers/net/wireless/ath/wil6210/debugfs.c
@@ -26,6 +26,8 @@
 /* Nasty hack. Better have per device instances */
 static u32 mem_addr;
 static u32 dbg_txdesc_index;
+static u32 dbg_vring_index; /* 25 for Rx, 0..24 for Tx */
+#define WIL_DBG_VRING_INDEX_RX (WIL6210_MAX_TX_RINGS + 1)
 
 static void wil_print_vring(struct seq_file *s, struct wil6210_priv *wil,
                             const char *name, struct vring *vring)
@@ -390,25 +392,39 @@ static const struct file_operations fops_reset = {
         .write = wil_write_file_reset,
         .open  = simple_open,
 };
-/*---------Tx descriptor------------*/
 
+/*---------Tx/Rx descriptor------------*/
 static int wil_txdesc_debugfs_show(struct seq_file *s, void *data)
 {
         struct wil6210_priv *wil = s->private;
-        struct vring *vring = &(wil->vring_tx[0]);
+        struct vring *vring;
+        if (dbg_vring_index <= WIL6210_MAX_TX_RINGS)
+                vring = &(wil->vring_tx[dbg_vring_index]);
+        else
+                vring = &wil->vring_rx;
 
         if (!vring->va) {
-                seq_printf(s, "No Tx VRING\n");
+                if (dbg_vring_index <= WIL6210_MAX_TX_RINGS)
+                        seq_printf(s, "No Tx[%2d] VRING\n", dbg_vring_index);
+                else
+                        seq_puts(s, "No Rx VRING\n");
                 return 0;
         }
 
         if (dbg_txdesc_index < vring->size) {
+                /* use struct vring_tx_desc for Rx as well,
+                 * only field used, .dma.length, is the same
+                 */
                 volatile struct vring_tx_desc *d =
                                 &(vring->va[dbg_txdesc_index].tx);
                 volatile u32 *u = (volatile u32 *)d;
                 struct sk_buff *skb = vring->ctx[dbg_txdesc_index].skb;
 
-                seq_printf(s, "Tx[%3d] = {\n", dbg_txdesc_index);
+                if (dbg_vring_index <= WIL6210_MAX_TX_RINGS)
+                        seq_printf(s, "Tx[%2d][%3d] = {\n", dbg_vring_index,
+                                   dbg_txdesc_index);
+                else
+                        seq_printf(s, "Rx[%3d] = {\n", dbg_txdesc_index);
                 seq_printf(s, "  MAC = 0x%08x 0x%08x 0x%08x 0x%08x\n",
                            u[0], u[1], u[2], u[3]);
                 seq_printf(s, "  DMA = 0x%08x 0x%08x 0x%08x 0x%08x\n",
@@ -439,8 +455,13 @@ static int wil_txdesc_debugfs_show(struct seq_file *s, void *data)
                 }
                 seq_printf(s, "}\n");
         } else {
-                seq_printf(s, "TxDesc index (%d) >= size (%d)\n",
-                           dbg_txdesc_index, vring->size);
+                if (dbg_vring_index <= WIL6210_MAX_TX_RINGS)
+                        seq_printf(s, "[%2d] TxDesc index (%d) >= size (%d)\n",
+                                   dbg_vring_index, dbg_txdesc_index,
+                                   vring->size);
+                else
+                        seq_printf(s, "RxDesc index (%d) >= size (%d)\n",
+                                   dbg_txdesc_index, vring->size);
         }
 
         return 0;
@@ -581,9 +602,12 @@ int wil6210_debugfs_init(struct wil6210_priv *wil)
 
         debugfs_create_file("mbox", S_IRUGO, dbg, wil, &fops_mbox);
         debugfs_create_file("vrings", S_IRUGO, dbg, wil, &fops_vring);
-        debugfs_create_file("txdesc", S_IRUGO, dbg, wil, &fops_txdesc);
-        debugfs_create_u32("txdesc_index", S_IRUGO | S_IWUSR, dbg,
+        debugfs_create_file("desc", S_IRUGO, dbg, wil, &fops_txdesc);
+        debugfs_create_u32("desc_index", S_IRUGO | S_IWUSR, dbg,
                            &dbg_txdesc_index);
+        debugfs_create_u32("vring_index", S_IRUGO | S_IWUSR, dbg,
+                           &dbg_vring_index);
+
         debugfs_create_file("bf", S_IRUGO, dbg, wil, &fops_bf);
         debugfs_create_file("ssid", S_IRUGO | S_IWUSR, dbg, wil, &fops_ssid);
         debugfs_create_u32("secure_pcp", S_IRUGO | S_IWUSR, dbg,