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mwl8k: Recover from firmware crash 

In case of firmware crash, reload the firmware and reconfigure it
by triggering ieee80211_hw_restart; mac80211 utility function.

V2 Addressed following comments from Lennert:
 - Stop the queues during reload
 - Removed atomic_t declaration for hw_restart
 - Extend the firmware reload support for sta firmware as well
 - Other misc changes

Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Yogesh Ashok Powar 2011-12-30 16:35:27 +05:30 committed by John W. Linville
parent 7f28197560
commit 6b6accc383
1 changed files with 129 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

136
drivers/net/wireless/mwl8k.c
View File

@ -198,6 +198,7 @@ struct mwl8k_priv {
/* firmware access */
struct mutex fw_mutex;
struct task_struct *fw_mutex_owner;
struct task_struct *hw_restart_owner;
int fw_mutex_depth;
struct completion *hostcmd_wait;
@ -262,6 +263,10 @@ struct mwl8k_priv {
*/
struct ieee80211_tx_queue_params wmm_params[MWL8K_TX_WMM_QUEUES];
/* To perform the task of reloading the firmware */
struct work_struct fw_reload;
bool hw_restart_in_progress;
/* async firmware loading state */
unsigned fw_state;
char *fw_pref;
@ -1498,6 +1503,18 @@ static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw)
might_sleep();
/* Since fw restart is in progress, allow only the firmware
* commands from the restart code and block the other
* commands since they are going to fail in any case since
* the firmware has crashed
*/
if (priv->hw_restart_in_progress) {
if (priv->hw_restart_owner == current)
return 0;
else
return -EBUSY;
}
/*
* The TX queues are stopped at this point, so this test
* doesn't need to take ->tx_lock.
@ -1541,6 +1558,8 @@ static int mwl8k_tx_wait_empty(struct ieee80211_hw *hw)
wiphy_err(hw->wiphy, "tx rings stuck for %d ms\n",
MWL8K_TX_WAIT_TIMEOUT_MS);
mwl8k_dump_tx_rings(hw);
priv->hw_restart_in_progress = true;
ieee80211_queue_work(hw, &priv->fw_reload);
rc = -ETIMEDOUT;
}
@ -2058,7 +2077,9 @@ static int mwl8k_fw_lock(struct ieee80211_hw *hw)
rc = mwl8k_tx_wait_empty(hw);
if (rc) {
ieee80211_wake_queues(hw);
if (!priv->hw_restart_in_progress)
ieee80211_wake_queues(hw);
mutex_unlock(&priv->fw_mutex);
return rc;
@ -2077,7 +2098,9 @@ static void mwl8k_fw_unlock(struct ieee80211_hw *hw)
struct mwl8k_priv *priv = hw->priv;
if (!--priv->fw_mutex_depth) {
ieee80211_wake_queues(hw);
if (!priv->hw_restart_in_progress)
ieee80211_wake_queues(hw);
priv->fw_mutex_owner = NULL;
mutex_unlock(&priv->fw_mutex);
}
@ -4398,7 +4421,8 @@ static void mwl8k_stop(struct ieee80211_hw *hw)
struct mwl8k_priv *priv = hw->priv;
int i;
mwl8k_cmd_radio_disable(hw);
if (!priv->hw_restart_in_progress)
mwl8k_cmd_radio_disable(hw);
ieee80211_stop_queues(hw);
@ -4499,6 +4523,16 @@ static int mwl8k_add_interface(struct ieee80211_hw *hw,
return 0;
}
static void mwl8k_remove_vif(struct mwl8k_priv *priv, struct mwl8k_vif *vif)
{
/* Has ieee80211_restart_hw re-added the removed interfaces? */
if (!priv->macids_used)
return;
priv->macids_used &= ~(1 << vif->macid);
list_del(&vif->list);
}
static void mwl8k_remove_interface(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
@ -4510,8 +4544,54 @@ static void mwl8k_remove_interface(struct ieee80211_hw *hw,
mwl8k_cmd_set_mac_addr(hw, vif, "\x00\x00\x00\x00\x00\x00");
priv->macids_used &= ~(1 << mwl8k_vif->macid);
list_del(&mwl8k_vif->list);
mwl8k_remove_vif(priv, mwl8k_vif);
}
static void mwl8k_hw_restart_work(struct work_struct *work)
{
struct mwl8k_priv *priv =
container_of(work, struct mwl8k_priv, fw_reload);
struct ieee80211_hw *hw = priv->hw;
struct mwl8k_device_info *di;
int rc;
/* If some command is waiting for a response, clear it */
if (priv->hostcmd_wait != NULL) {
complete(priv->hostcmd_wait);
priv->hostcmd_wait = NULL;
}
priv->hw_restart_owner = current;
di = priv->device_info;
mwl8k_fw_lock(hw);
if (priv->ap_fw)
rc = mwl8k_reload_firmware(hw, di->fw_image_ap);
else
rc = mwl8k_reload_firmware(hw, di->fw_image_sta);
if (rc)
goto fail;
priv->hw_restart_owner = NULL;
priv->hw_restart_in_progress = false;
/*
* This unlock will wake up the queues and
* also opens the command path for other
* commands
*/
mwl8k_fw_unlock(hw);
ieee80211_restart_hw(hw);
wiphy_err(hw->wiphy, "Firmware restarted successfully\n");
return;
fail:
mwl8k_fw_unlock(hw);
wiphy_err(hw->wiphy, "Firmware restart failed\n");
}
static int mwl8k_config(struct ieee80211_hw *hw, u32 changed)
@ -5024,7 +5104,11 @@ mwl8k_ampdu_action(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
for (i = 0; i < MAX_AMPDU_ATTEMPTS; i++) {
rc = mwl8k_check_ba(hw, stream);
if (!rc)
/* If HW restart is in progress mwl8k_post_cmd will
* return -EBUSY. Avoid retrying mwl8k_check_ba in
* such cases
*/
if (!rc || rc == -EBUSY)
break;
/*
* HW queues take time to be flushed, give them
@ -5263,12 +5347,15 @@ static void mwl8k_fw_state_machine(const struct firmware *fw, void *context)
mwl8k_release_firmware(priv);
}
#define MAX_RESTART_ATTEMPTS 1
static int mwl8k_init_firmware(struct ieee80211_hw *hw, char *fw_image,
bool nowait)
{
struct mwl8k_priv *priv = hw->priv;
int rc;
int count = MAX_RESTART_ATTEMPTS;
retry:
/* Reset firmware and hardware */
mwl8k_hw_reset(priv);
@ -5290,6 +5377,16 @@ static int mwl8k_init_firmware(struct ieee80211_hw *hw, char *fw_image,
/* Reclaim memory once firmware is successfully loaded */
mwl8k_release_firmware(priv);
if (rc && count) {
/* FW did not start successfully;
* lets try one more time
*/
count--;
wiphy_err(hw->wiphy, "Trying to reload the firmware again\n");
msleep(20);
goto retry;
}
return rc;
}
@ -5365,7 +5462,14 @@ static int mwl8k_probe_hw(struct ieee80211_hw *hw)
goto err_free_queues;
}
memset(priv->ampdu, 0, sizeof(priv->ampdu));
/*
* When hw restart is requested,
* mac80211 will take care of clearing
* the ampdu streams, so do not clear
* the ampdu state here
*/
if (!priv->hw_restart_in_progress)
memset(priv->ampdu, 0, sizeof(priv->ampdu));
/*
* Temporarily enable interrupts. Initial firmware host
@ -5439,10 +5543,20 @@ static int mwl8k_reload_firmware(struct ieee80211_hw *hw, char *fw_image)
{
int i, rc = 0;
struct mwl8k_priv *priv = hw->priv;
struct mwl8k_vif *vif, *tmp_vif;
mwl8k_stop(hw);
mwl8k_rxq_deinit(hw, 0);
/*
* All the existing interfaces are re-added by the ieee80211_reconfig;
* which means driver should remove existing interfaces before calling
* ieee80211_restart_hw
*/
if (priv->hw_restart_in_progress)
list_for_each_entry_safe(vif, tmp_vif, &priv->vif_list, list)
mwl8k_remove_vif(priv, vif);
for (i = 0; i < mwl8k_tx_queues(priv); i++)
mwl8k_txq_deinit(hw, i);
@ -5454,6 +5568,9 @@ static int mwl8k_reload_firmware(struct ieee80211_hw *hw, char *fw_image)
if (rc)
goto fail;
if (priv->hw_restart_in_progress)
return rc;
rc = mwl8k_start(hw);
if (rc)
goto fail;
@ -5524,6 +5641,8 @@ static int mwl8k_firmware_load_success(struct mwl8k_priv *priv)
INIT_WORK(&priv->finalize_join_worker, mwl8k_finalize_join_worker);
/* Handle watchdog ba events */
INIT_WORK(&priv->watchdog_ba_handle, mwl8k_watchdog_ba_events);
/* To reload the firmware if it crashes */
INIT_WORK(&priv->fw_reload, mwl8k_hw_restart_work);
/* TX reclaim and RX tasklets. */
tasklet_init(&priv->poll_tx_task, mwl8k_tx_poll, (unsigned long)hw);
@ -5667,6 +5786,9 @@ static int __devinit mwl8k_probe(struct pci_dev *pdev,
rc = mwl8k_init_firmware(hw, priv->fw_pref, true);
if (rc)
goto err_stop_firmware;
priv->hw_restart_in_progress = false;
return rc;
err_stop_firmware: