iwlwifi: mvm: allow firmware crashes to wake system for debug
When the D3 firmware crashes, it can be helpful for debugging to
resume the system to get the SRAM snapshot to see why it crashed.
Allow enabling this with a debugfs option.
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/d3.c b/drivers/net/wireless/iwlwifi/mvm/d3.c
index 8c49db0..7e5e5c2 100644
--- a/drivers/net/wireless/iwlwifi/mvm/d3.c
+++ b/drivers/net/wireless/iwlwifi/mvm/d3.c
@@ -1026,6 +1026,12 @@
if (ret)
goto out;
+#ifdef CONFIG_IWLWIFI_DEBUGFS
+ if (mvm->d3_wake_sysassert)
+ d3_cfg_cmd_data.wakeup_flags |=
+ cpu_to_le32(IWL_WAKEUP_D3_CONFIG_FW_ERROR);
+#endif
+
/* must be last -- this switches firmware state */
ret = iwl_mvm_send_cmd(mvm, &d3_cfg_cmd);
if (ret)
diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index b7643c1..63d19d9 100644
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -939,6 +939,9 @@
#ifdef CONFIG_PM_SLEEP
MVM_DEBUGFS_ADD_FILE(d3_sram, mvm->debugfs_dir, S_IRUSR | S_IWUSR);
MVM_DEBUGFS_ADD_FILE(d3_test, mvm->debugfs_dir, S_IRUSR);
+ if (!debugfs_create_bool("d3_wake_sysassert", S_IRUSR | S_IWUSR,
+ mvm->debugfs_dir, &mvm->d3_wake_sysassert))
+ goto err;
#endif
/*
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index ad39a22..fbc0acb 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -460,6 +460,7 @@
#ifdef CONFIG_PM_SLEEP
int gtk_ivlen, gtk_icvlen, ptk_ivlen, ptk_icvlen;
#ifdef CONFIG_IWLWIFI_DEBUGFS
+ u32 d3_wake_sysassert; /* must be u32 for debugfs_create_bool */
bool d3_test_active;
bool store_d3_resume_sram;
void *d3_resume_sram;