[PATCH] wifi: mt76: mt7915: add debug query from WA firmware

[David Bauer <mail@david-bauer.net>]

Add a new file to the mt76 debugfs to allow querying internal state
information from the WA firmware.

This allows to extract more information from the internal queue
structures and configured limits.

Signed-off-by: David Bauer <mail@david-bauer.net>
---
 .../wireless/mediatek/mt76/mt7915/debugfs.c   | 81 +++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c b/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
index 26ed3745af43e..018b1c70b524b 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/debugfs.c
@@ -603,6 +603,86 @@ mt7915_fw_debug_wa_get(void *data, u64 *val)
 DEFINE_DEBUGFS_ATTRIBUTE(fops_fw_debug_wa, mt7915_fw_debug_wa_get,
 			 mt7915_fw_debug_wa_set, "%lld\n");
 
+struct {
+	u8 idx;
+	u8 query_cmd;
+	char *description;
+} mt7915_fw_wa_debug_query[] = {
+	{ 0, 0x16, "MSDU drop info" },
+	{ 1, 0x17, "AC queue tail drop" },
+	{ 2, 0x19, "TX Free info" },
+	{ 3, 0x20, "BSS Table" },
+	{ 4, 0x21, "STA records" },
+};
+
+static ssize_t
+mt7915_fw_query_wa_set(struct file *file, const char __user *user_buf,
+		       size_t count, loff_t *ppos)
+{
+	struct mt7915_phy *phy = file->private_data;
+	struct mt7915_dev *dev = phy->dev;
+	char buf[16];
+	u16 val;
+
+	if (count >= sizeof(buf))
+		return -EINVAL;
+
+	if (copy_from_user(buf, user_buf, count))
+		return -EFAULT;
+
+	if (count && buf[count - 1] == '\n')
+		buf[count - 1] = '\0';
+	else
+		buf[count] = '\0';
+
+	if (kstrtou16(buf, 0, &val))
+		return -EINVAL;
+
+	for (int i = 0; i < ARRAY_SIZE(mt7915_fw_wa_debug_query); i++) {
+		if (val != mt7915_fw_wa_debug_query[i].idx)
+			continue;
+
+		mt7915_mcu_wa_cmd(dev, MCU_WA_PARAM_CMD(QUERY),
+				  mt7915_fw_wa_debug_query[i].query_cmd,
+				  0, 0);
+		return count;
+	}
+
+	return -EINVAL;
+}
+
+static ssize_t
+mt7915_fw_query_wa_get(struct file *file, char __user *user_buf,
+		       size_t count, loff_t *ppos)
+{
+	static const size_t bufsz = 1024;
+	ssize_t ret;
+	char *buff;
+	int desc = 0;
+	int i;
+
+	buff = kmalloc(bufsz, GFP_KERNEL);
+	if (!buff)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(mt7915_fw_wa_debug_query); i++) {
+		desc += scnprintf(buff + desc, bufsz - desc,
+				  "%d: %s\n", mt7915_fw_wa_debug_query[i].idx,
+				  mt7915_fw_wa_debug_query[i].description);
+	}
+
+	ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+	kfree(buff);
+	return ret;
+}
+
+static const struct file_operations fw_query_wa_fops = {
+	.write = mt7915_fw_query_wa_set,
+	.read = mt7915_fw_query_wa_get,
+	.open = simple_open,
+	.llseek = default_llseek,
+};
+
 static struct dentry *
 create_buf_file_cb(const char *filename, struct dentry *parent, umode_t mode,
 		   struct rchan_buf *buf, int *is_global)
@@ -1310,6 +1390,7 @@ int mt7915_init_debugfs(struct mt7915_phy *phy)
 			    &mt7915_sys_recovery_ops);
 	debugfs_create_file("fw_debug_wm", 0600, dir, dev, &fops_fw_debug_wm);
 	debugfs_create_file("fw_debug_wa", 0600, dir, dev, &fops_fw_debug_wa);
+	debugfs_create_file("fw_query_wa", 0600, dir, dev, &fw_query_wa_fops);
 	debugfs_create_file("fw_debug_bin", 0600, dir, dev, &fops_fw_debug_bin);
 	debugfs_create_file("fw_util_wm", 0400, dir, dev,
 			    &mt7915_fw_util_wm_fops);
-- 
2.51.0