From: Alexander Bondar <alexander.bondar@xxxxxxxxx>
Writting to fw_nmi entry will set DEVICE_SET_NMI_REG (0x00a01c30)
generating NMI that halts NIC CPU.
Reviewed-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Alexander Bondar <alexander.bondar@xxxxxxxxx>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
---
drivers/net/wireless/iwlwifi/iwl-prph.h | 3 +++
drivers/net/wireless/iwlwifi/mvm/debugfs.c | 14 ++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/drivers/net/wireless/iwlwifi/iwl-prph.h b/drivers/net/wireless/iwlwifi/iwl-prph.h
index a70c7b9..f6412da 100644
--- a/drivers/net/wireless/iwlwifi/iwl-prph.h
+++ b/drivers/net/wireless/iwlwifi/iwl-prph.h
@@ -102,6 +102,9 @@
/* Device system time */
#define DEVICE_SYSTEM_TIME_REG 0xA0206C
+/* Device NMI register */
+#define DEVICE_SET_NMI_REG 0x00a01c30
+
/*****************************************************************************
* 7000/3000 series SHR DTS addresses *
*****************************************************************************/
diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index 9864d71..4b31d06 100644
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -63,6 +63,7 @@
#include "mvm.h"
#include "sta.h"
#include "iwl-io.h"
+#include "iwl-prph.h"
struct iwl_dbgfs_mvm_ctx {
struct iwl_mvm *mvm;
@@ -800,6 +801,17 @@ static ssize_t iwl_dbgfs_fw_restart_write(struct file *file,
return count;
}
+static ssize_t iwl_dbgfs_fw_nmi_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct iwl_mvm *mvm = file->private_data;
+
+ iwl_write_prph(mvm->trans, DEVICE_SET_NMI_REG, 1);
+
+ return count;
+}
+
static ssize_t
iwl_dbgfs_scan_ant_rxchain_read(struct file *file,
char __user *user_buf,
@@ -1164,6 +1176,7 @@ MVM_DEBUGFS_READ_FILE_OPS(bt_cmd);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(disable_power_off);
MVM_DEBUGFS_READ_FILE_OPS(fw_rx_stats);
MVM_DEBUGFS_WRITE_FILE_OPS(fw_restart);
+MVM_DEBUGFS_WRITE_FILE_OPS(fw_nmi);
MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain);
#ifdef CONFIG_PM_SLEEP
@@ -1192,6 +1205,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
S_IRUSR | S_IWUSR);
MVM_DEBUGFS_ADD_FILE(fw_rx_stats, mvm->debugfs_dir, S_IRUSR);
MVM_DEBUGFS_ADD_FILE(fw_restart, mvm->debugfs_dir, S_IWUSR);
+ MVM_DEBUGFS_ADD_FILE(fw_nmi, mvm->debugfs_dir, S_IWUSR);
MVM_DEBUGFS_ADD_FILE(scan_ant_rxchain, mvm->debugfs_dir,
S_IWUSR | S_IRUSR);
#ifdef CONFIG_PM_SLEEP
--
1.7.9.5
--
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