iwlwifi: mvm/pcie: capture last commands on firmware error

When a firmware error occurs, capture the last 32 commands
(which are still in memory) in the error dump debugfs file.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c
index a6f86220e0aa..f41f9b7a6007 100644
--- a/drivers/net/wireless/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/iwlwifi/pcie/trans.c
@@ -73,6 +73,7 @@
 #include "iwl-csr.h"
 #include "iwl-prph.h"
 #include "iwl-agn-hw.h"
+#include "iwl-fw-error-dump.h"
 #include "internal.h"
 
 static u32 iwl_trans_pcie_read_shr(struct iwl_trans *trans, u32 reg)
@@ -1669,6 +1670,61 @@ err:
 	IWL_ERR(trans, "failed to create the trans debugfs entry\n");
 	return -ENOMEM;
 }
+
+static u32 iwl_trans_pcie_get_cmdlen(struct iwl_tfd *tfd)
+{
+	u32 cmdlen = 0;
+	int i;
+
+	for (i = 0; i < IWL_NUM_OF_TBS; i++)
+		cmdlen += iwl_pcie_tfd_tb_get_len(tfd, i);
+
+	return cmdlen;
+}
+
+static u32 iwl_trans_pcie_dump_data(struct iwl_trans *trans,
+				    void *buf, u32 buflen)
+{
+	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
+	struct iwl_fw_error_dump_data *data;
+	struct iwl_txq *cmdq = &trans_pcie->txq[trans_pcie->cmd_queue];
+	struct iwl_fw_error_dump_txcmd *txcmd;
+	u32 len;
+	int i, ptr;
+
+	if (!buf)
+		return sizeof(*data) +
+		       cmdq->q.n_window * (sizeof(*txcmd) +
+					   TFD_MAX_PAYLOAD_SIZE);
+
+	len = 0;
+	data = buf;
+	data->type = cpu_to_le32(IWL_FW_ERROR_DUMP_TXCMD);
+	txcmd = (void *)data->data;
+	spin_lock_bh(&cmdq->lock);
+	ptr = cmdq->q.write_ptr;
+	for (i = 0; i < cmdq->q.n_window; i++) {
+		u8 idx = get_cmd_index(&cmdq->q, ptr);
+		u32 caplen, cmdlen;
+
+		cmdlen = iwl_trans_pcie_get_cmdlen(&cmdq->tfds[ptr]);
+		caplen = min_t(u32, TFD_MAX_PAYLOAD_SIZE, cmdlen);
+
+		if (cmdlen) {
+			len += sizeof(*txcmd) + caplen;
+			txcmd->cmdlen = cpu_to_le32(cmdlen);
+			txcmd->caplen = cpu_to_le32(caplen);
+			memcpy(txcmd->data, cmdq->entries[idx].cmd, caplen);
+			txcmd = (void *)((u8 *)txcmd->data + caplen);
+		}
+
+		ptr = iwl_queue_dec_wrap(ptr);
+	}
+	spin_unlock_bh(&cmdq->lock);
+
+	data->len = cpu_to_le32(len);
+	return sizeof(*data) + len;
+}
 #else
 static int iwl_trans_pcie_dbgfs_register(struct iwl_trans *trans,
 					 struct dentry *dir)
@@ -1711,6 +1767,10 @@ static const struct iwl_trans_ops trans_ops_pcie = {
 	.grab_nic_access = iwl_trans_pcie_grab_nic_access,
 	.release_nic_access = iwl_trans_pcie_release_nic_access,
 	.set_bits_mask = iwl_trans_pcie_set_bits_mask,
+
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+	.dump_data = iwl_trans_pcie_dump_data,
+#endif
 };
 
 struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,