From c66ab56ad90355f20364794d1c6201831a5ceea9 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Sun, 24 Oct 2021 16:55:06 +0300
Subject: [PATCH] iwlwifi: dump host monitor data when NIC doesn't init
Git-commit: c66ab56ad90355f20364794d1c6201831a5ceea9
Patch-mainline: v5.16-rc1
References: bsc#1202131

If the NIC cannot be initialized, dump host monitor data
so we can analyze properly why it didn't initialize.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211024165252.21c90ba4fa5f.I2a30f62aa4685dc7623d3c69838909833c3f435c@changeid
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/net/wireless/intel/iwlwifi/iwl-io.c | 46 ++++++++++++++++++++-
 1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-io.c b/drivers/net/wireless/intel/iwlwifi/iwl-io.c
index 6e96ee5bc261..46917b4216b3 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-io.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-io.c
@@ -398,6 +398,47 @@ int iwl_dump_fh(struct iwl_trans *trans, char **buf)
 	return 0;
 }
 
+#define IWL_HOST_MON_BLOCK_PEMON	0x00
+#define IWL_HOST_MON_BLOCK_HIPM		0x22
+
+#define IWL_HOST_MON_BLOCK_PEMON_VEC0	0x00
+#define IWL_HOST_MON_BLOCK_PEMON_VEC1	0x01
+#define IWL_HOST_MON_BLOCK_PEMON_WFPM	0x06
+
+static void iwl_dump_host_monitor_block(struct iwl_trans *trans,
+					u32 block, u32 vec, u32 iter)
+{
+	int i;
+
+	IWL_ERR(trans, "Host monitor block 0x%x vector 0x%x\n", block, vec);
+	iwl_write32(trans, CSR_MONITOR_CFG_REG, (block << 8) | vec);
+	for (i = 0; i < iter; i++)
+		IWL_ERR(trans, "    value [iter %d]: 0x%08x\n",
+			i, iwl_read32(trans, CSR_MONITOR_STATUS_REG));
+}
+
+static void iwl_dump_host_monitor(struct iwl_trans *trans)
+{
+	switch (trans->trans_cfg->device_family) {
+	case IWL_DEVICE_FAMILY_22000:
+	case IWL_DEVICE_FAMILY_AX210:
+		IWL_ERR(trans, "CSR_RESET = 0x%x\n",
+			iwl_read32(trans, CSR_RESET));
+		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_PEMON,
+					    IWL_HOST_MON_BLOCK_PEMON_VEC0, 15);
+		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_PEMON,
+					    IWL_HOST_MON_BLOCK_PEMON_VEC1, 15);
+		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_PEMON,
+					    IWL_HOST_MON_BLOCK_PEMON_WFPM, 15);
+		iwl_dump_host_monitor_block(trans, IWL_HOST_MON_BLOCK_HIPM,
+					    IWL_HOST_MON_BLOCK_PEMON_VEC0, 1);
+		break;
+	default:
+		/* not supported yet */
+		return;
+	}
+}
+
 int iwl_finish_nic_init(struct iwl_trans *trans)
 {
 	const struct iwl_cfg_trans_params *cfg_trans = trans->trans_cfg;
@@ -433,9 +474,12 @@ int iwl_finish_nic_init(struct iwl_trans *trans)
 	 * and accesses to uCode SRAM.
 	 */
 	err = iwl_poll_bit(trans, CSR_GP_CNTRL, poll_ready, poll_ready, 25000);
-	if (err < 0)
+	if (err < 0) {
 		IWL_DEBUG_INFO(trans, "Failed to wake NIC\n");
 
+		iwl_dump_host_monitor(trans);
+	}
+
 	if (cfg_trans->bisr_workaround) {
 		/* ensure BISR shift has finished */
 		udelay(200);
-- 
2.35.3