* [PATCH 2/3] ath11k: add support for device recovery for QCA6390
2021-10-11 8:19 [PATCH 0/3] ath11k: add feature for device recovery Wen Gong
2021-10-11 8:19 ` [PATCH 1/3] ath11k: add ath11k_qmi_free_resource() for recovery Wen Gong
@ 2021-10-11 8:19 ` Wen Gong
2021-10-11 8:19 ` [PATCH 3/3] ath11k: add synchronization operation between reconfigure of mac80211 and ath11k_base Wen Gong
2 siblings, 0 replies; 5+ messages in thread
From: Wen Gong @ 2021-10-11 8:19 UTC (permalink / raw)
To: ath11k; +Cc: linux-wireless, wgong
Currently ath11k has device recovery logic, it is introduced by this
patch "ath11k: Add support for subsystem recovery" which is upstream
by https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=ath11k-bringup&id=3a7b4838b6f6f234239f263ef3dc02e612a083ad.
The patch is for AHB devices such as IPQ8074, it has remote proc module
which is used to download the firmware and boots the processor which
firmware is running on. If firmware crashed, remote proc module will
detect it and download and boot firmware again. Below command will
trigger a firmware crash, and then user can test feature of device
recovery.
Test command:
echo assert > /sys/kernel/debug/ath11k/qca6390\ hw2.0/simulate_fw_crash
Unfortunately, QCA6390 is PCIe bus, it does not have the remote proc
module, it use mhi module to communicate between firmware and ath11k.
So ath11k does not support device recovery for QCA6390 currently.
This patch is to add the extra logic which is different for QCA6390.
When firmware crashed, MHI_CB_EE_RDDM event will be indicate by
firmware and then ath11k_mhi_op_status_cb which is the callback of
mhi_controller will receive the MHI_CB_EE_RDDM event, then ath11k
will start to do recovery process, ath11k_core_reset() calls
ath11k_hif_power_down()/ath11k_hif_power_up(), then the mhi/ath11k
will start to download and boot firmware. There are some logic to
avoid deadloop recovery and two simultaneous recovery operations.
And because it has muti-radios for the soc, so it add some logic
in ath11k_mac_op_reconfig_complete() to make sure all radios has
reconfig complete and then complete the device recovery.
Also it add workqueue_aux, because ab->workqueue is used when receive
ATH11K_QMI_EVENT_FW_READY in recovery process(queue_work(ab->workqueue,
&ab->restart_work)), and ath11k_core_reset will wait for max
ATH11K_RESET_TIMEOUT_HZ for the previous restart_work finished, if
ath11k_core_reset also queued in ab->workqueue, then it will delay
restart_work of previous recovery and lead previous recovery fail.
ath11k recovery success for QCA6390 after apply this patch.
Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
Signed-off-by: Wen Gong <wgong@codeaurora.org>
---
drivers/net/wireless/ath/ath11k/core.c | 67 ++++++++++++++++++++++++++
drivers/net/wireless/ath/ath11k/core.h | 13 +++++
drivers/net/wireless/ath/ath11k/mac.c | 18 +++++++
drivers/net/wireless/ath/ath11k/mhi.c | 33 +++++++++++++
drivers/net/wireless/ath/ath11k/pci.c | 3 ++
5 files changed, 134 insertions(+)
diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
index 969bf1a590d9..be788ec08200 100644
--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -1043,6 +1043,65 @@ static void ath11k_core_restart(struct work_struct *work)
complete(&ab->driver_recovery);
}
+static void ath11k_core_reset(struct work_struct *work)
+{
+ struct ath11k_base *ab = container_of(work, struct ath11k_base, reset_work);
+ int reset_count, fail_cont_count;
+ long time_left;
+
+ if (!(test_bit(ATH11K_FLAG_REGISTERED, &ab->dev_flags))) {
+ ath11k_warn(ab, "ignore reset dev flags 0x%lx\n", ab->dev_flags);
+ return;
+ }
+
+ /* Sometimes the recovery will fail and then the next all recovery fail,
+ * this is to avoid infinite recovery since it can not recovery success.
+ */
+ fail_cont_count = atomic_read(&ab->fail_cont_count);
+
+ if (fail_cont_count >= ATH11K_RESET_MAX_FAIL_COUNT_FINAL)
+ return;
+
+ if (fail_cont_count >= ATH11K_RESET_MAX_FAIL_COUNT_FIRST &&
+ time_before(jiffies, ab->reset_fail_timeout))
+ return;
+
+ reset_count = atomic_inc_return(&ab->reset_count);
+
+ if (reset_count > 1) {
+ /* Sometimes it happened another reset worker before the previous one
+ * completed, then the second reset worker will destroy the previous one,
+ * thus below is to avoid that.
+ */
+ ath11k_warn(ab, "already reseting count %d\n", reset_count);
+
+ reinit_completion(&ab->reset_complete);
+ time_left = wait_for_completion_timeout(&ab->reset_complete,
+ ATH11K_RESET_TIMEOUT_HZ);
+
+ if (time_left) {
+ ath11k_dbg(ab, ATH11K_DBG_BOOT, "to skip reset\n");
+ atomic_dec(&ab->reset_count);
+ return;
+ }
+
+ ab->reset_fail_timeout = jiffies + ATH11K_RESET_FAIL_TIMEOUT_HZ;
+ /* Record the continuous recovery fail count when recovery failed*/
+ fail_cont_count = atomic_inc_return(&ab->fail_cont_count);
+ }
+
+ ath11k_dbg(ab, ATH11K_DBG_BOOT, "reset starting\n");
+
+ ab->is_reset = true;
+ atomic_set(&ab->recovery_count, 0);
+
+ ath11k_hif_power_down(ab);
+ ath11k_qmi_free_resource(ab);
+ ath11k_hif_power_up(ab);
+
+ ath11k_dbg(ab, ATH11K_DBG_BOOT, "reset started\n");
+}
+
static int ath11k_init_hw_params(struct ath11k_base *ab)
{
const struct ath11k_hw_params *hw_params = NULL;
@@ -1132,14 +1191,20 @@ struct ath11k_base *ath11k_core_alloc(struct device *dev, size_t priv_size,
if (!ab->workqueue)
goto err_sc_free;
+ ab->workqueue_aux = create_singlethread_workqueue("ath11k_aux_wq");
+ if (!ab->workqueue_aux)
+ goto err_free_wq;
+
mutex_init(&ab->core_lock);
spin_lock_init(&ab->base_lock);
+ init_completion(&ab->reset_complete);
INIT_LIST_HEAD(&ab->peers);
init_waitqueue_head(&ab->peer_mapping_wq);
init_waitqueue_head(&ab->wmi_ab.tx_credits_wq);
init_waitqueue_head(&ab->qmi.cold_boot_waitq);
INIT_WORK(&ab->restart_work, ath11k_core_restart);
+ INIT_WORK(&ab->reset_work, ath11k_core_reset);
timer_setup(&ab->rx_replenish_retry, ath11k_ce_rx_replenish_retry, 0);
init_completion(&ab->htc_suspend);
init_completion(&ab->wow.wakeup_completed);
@@ -1150,6 +1215,8 @@ struct ath11k_base *ath11k_core_alloc(struct device *dev, size_t priv_size,
return ab;
+err_free_wq:
+ destroy_workqueue(ab->workqueue);
err_sc_free:
kfree(ab);
return NULL;
diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
index 018fb2385f2a..9a9f8f24d407 100644
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -39,6 +39,10 @@
extern unsigned int ath11k_frame_mode;
#define ATH11K_MON_TIMER_INTERVAL 10
+#define ATH11K_RESET_TIMEOUT_HZ (20 * HZ)
+#define ATH11K_RESET_MAX_FAIL_COUNT_FIRST 3
+#define ATH11K_RESET_MAX_FAIL_COUNT_FINAL 5
+#define ATH11K_RESET_FAIL_TIMEOUT_HZ (20 * HZ)
enum ath11k_supported_bw {
ATH11K_BW_20 = 0,
@@ -734,6 +738,15 @@ struct ath11k_base {
struct completion driver_recovery;
struct workqueue_struct *workqueue;
struct work_struct restart_work;
+ struct workqueue_struct *workqueue_aux;
+ struct work_struct reset_work;
+ atomic_t reset_count;
+ atomic_t recovery_count;
+ bool is_reset;
+ struct completion reset_complete;
+ /* continuous recovery fail count */
+ atomic_t fail_cont_count;
+ unsigned long reset_fail_timeout;
struct {
/* protected by data_lock */
u32 fw_crash_counter;
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index eb52332dbe3f..b0a2f257f328 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -6032,6 +6032,8 @@ ath11k_mac_op_reconfig_complete(struct ieee80211_hw *hw,
enum ieee80211_reconfig_type reconfig_type)
{
struct ath11k *ar = hw->priv;
+ struct ath11k_base *ab = ar->ab;
+ int recovery_count;
if (reconfig_type != IEEE80211_RECONFIG_TYPE_RESTART)
return;
@@ -6043,6 +6045,22 @@ ath11k_mac_op_reconfig_complete(struct ieee80211_hw *hw,
ar->pdev->pdev_id);
ar->state = ATH11K_STATE_ON;
ieee80211_wake_queues(ar->hw);
+
+ if (ab->is_reset) {
+ recovery_count = atomic_inc_return(&ab->recovery_count);
+ ath11k_dbg(ab, ATH11K_DBG_BOOT,
+ "recovery count %d\n", recovery_count);
+ /* When there are multiple radios in an SOC,
+ * the recovery has to be done for each radio
+ */
+ if (recovery_count == ab->num_radios) {
+ atomic_dec(&ab->reset_count);
+ complete(&ab->reset_complete);
+ ab->is_reset = false;
+ atomic_set(&ab->fail_cont_count, 0);
+ ath11k_dbg(ab, ATH11K_DBG_BOOT, "reset success\n");
+ }
+ }
}
mutex_unlock(&ar->conf_mutex);
diff --git a/drivers/net/wireless/ath/ath11k/mhi.c b/drivers/net/wireless/ath/ath11k/mhi.c
index 75cc2d80fde8..aea21ea2ca47 100644
--- a/drivers/net/wireless/ath/ath11k/mhi.c
+++ b/drivers/net/wireless/ath/ath11k/mhi.c
@@ -281,15 +281,48 @@ static void ath11k_mhi_op_runtime_put(struct mhi_controller *mhi_cntrl)
{
}
+static char *ath11k_mhi_op_callback_to_str(enum mhi_callback reason)
+{
+ switch (reason) {
+ case MHI_CB_IDLE:
+ return "MHI_CB_IDLE";
+ case MHI_CB_PENDING_DATA:
+ return "MHI_CB_PENDING_DATA";
+ case MHI_CB_LPM_ENTER:
+ return "MHI_CB_LPM_ENTER";
+ case MHI_CB_LPM_EXIT:
+ return "MHI_CB_LPM_EXIT";
+ case MHI_CB_EE_RDDM:
+ return "MHI_CB_EE_RDDM";
+ case MHI_CB_EE_MISSION_MODE:
+ return "MHI_CB_EE_MISSION_MODE";
+ case MHI_CB_SYS_ERROR:
+ return "MHI_CB_SYS_ERROR";
+ case MHI_CB_FATAL_ERROR:
+ return "MHI_CB_FATAL_ERROR";
+ case MHI_CB_BW_REQ:
+ return "MHI_CB_BW_REQ";
+ default:
+ return "UNKNOWN";
+ }
+};
+
static void ath11k_mhi_op_status_cb(struct mhi_controller *mhi_cntrl,
enum mhi_callback cb)
{
struct ath11k_base *ab = dev_get_drvdata(mhi_cntrl->cntrl_dev);
+ ath11k_dbg(ab, ATH11K_DBG_BOOT, "mhi notify status reason %s\n",
+ ath11k_mhi_op_callback_to_str(cb));
+
switch (cb) {
case MHI_CB_SYS_ERROR:
ath11k_warn(ab, "firmware crashed: MHI_CB_SYS_ERROR\n");
break;
+ case MHI_CB_EE_RDDM:
+ if (!(test_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags)))
+ queue_work(ab->workqueue_aux, &ab->reset_work);
+ break;
default:
break;
}
diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index 646ad79f309c..1f8e3837cdfb 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -1346,6 +1346,7 @@ static void ath11k_pci_remove(struct pci_dev *pdev)
set_bit(ATH11K_FLAG_UNREGISTERING, &ab->dev_flags);
+ cancel_work_sync(&ab->reset_work);
ath11k_core_deinit(ab);
qmi_fail:
@@ -1357,6 +1358,8 @@ static void ath11k_pci_remove(struct pci_dev *pdev)
ath11k_hal_srng_deinit(ab);
ath11k_ce_free_pipes(ab);
+
+ destroy_workqueue(ab->workqueue_aux);
ath11k_core_free(ab);
}
--
2.31.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/3] ath11k: add synchronization operation between reconfigure of mac80211 and ath11k_base
2021-10-11 8:19 [PATCH 0/3] ath11k: add feature for device recovery Wen Gong
2021-10-11 8:19 ` [PATCH 1/3] ath11k: add ath11k_qmi_free_resource() for recovery Wen Gong
2021-10-11 8:19 ` [PATCH 2/3] ath11k: add support for device recovery for QCA6390 Wen Gong
@ 2021-10-11 8:19 ` Wen Gong
2021-10-11 11:59 ` kernel test robot
2 siblings, 1 reply; 5+ messages in thread
From: Wen Gong @ 2021-10-11 8:19 UTC (permalink / raw)
To: ath11k; +Cc: linux-wireless, wgong
ieee80211_reconfig() of mac80211 is the main function for recovery of
each ieee80211_hw and ath11k, and ath11k_core_reconfigure_on_crash()
is the main function for recovery of ath11k_base, it has more than
one ieee80211_hw and ath11k for each ath11k_base, so it need to add
synchronization between them, otherwise it has many issue.
For example, when ath11k_core_reconfigure_on_crash() is not complete,
mac80211 send a hw scan request to ath11k, it leads firmware crash,
because firmware has not been initilized at that moment, firmware
is only finished downloaded and loaded, it can not receive scan
command.
Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
Signed-off-by: Wen Gong <wgong@codeaurora.org>
---
drivers/net/wireless/ath/ath11k/core.c | 52 ++++++++++++++++++++++----
drivers/net/wireless/ath/ath11k/core.h | 5 +++
drivers/net/wireless/ath/ath11k/mac.c | 23 ++++++++++++
3 files changed, 72 insertions(+), 8 deletions(-)
diff --git a/drivers/net/wireless/ath/ath11k/core.c b/drivers/net/wireless/ath/ath11k/core.c
index be788ec08200..0dc489d5c259 100644
--- a/drivers/net/wireless/ath/ath11k/core.c
+++ b/drivers/net/wireless/ath/ath11k/core.c
@@ -965,12 +965,11 @@ void ath11k_core_halt(struct ath11k *ar)
idr_init(&ar->txmgmt_idr);
}
-static void ath11k_core_restart(struct work_struct *work)
+static void ath11k_core_pre_reconfigure_recovery(struct ath11k_base *ab)
{
- struct ath11k_base *ab = container_of(work, struct ath11k_base, restart_work);
struct ath11k *ar;
struct ath11k_pdev *pdev;
- int i, ret = 0;
+ int i;
spin_lock_bh(&ab->base_lock);
ab->stats.fw_crash_counter++;
@@ -1002,12 +1001,13 @@ static void ath11k_core_restart(struct work_struct *work)
wake_up(&ab->wmi_ab.tx_credits_wq);
wake_up(&ab->peer_mapping_wq);
+}
- ret = ath11k_core_reconfigure_on_crash(ab);
- if (ret) {
- ath11k_err(ab, "failed to reconfigure driver on crash recovery\n");
- return;
- }
+static void ath11k_core_post_reconfigure_recovery(struct ath11k_base *ab)
+{
+ struct ath11k *ar;
+ struct ath11k_pdev *pdev;
+ int i;
for (i = 0; i < ab->num_radios; i++) {
pdev = &ab->pdevs[i];
@@ -1043,6 +1043,27 @@ static void ath11k_core_restart(struct work_struct *work)
complete(&ab->driver_recovery);
}
+static void ath11k_core_restart(struct work_struct *work)
+{
+ struct ath11k_base *ab = container_of(work, struct ath11k_base, restart_work);
+ int ret;
+
+ if (!ab->is_reset)
+ ath11k_core_pre_reconfigure_recovery(ab);
+
+ ret = ath11k_core_reconfigure_on_crash(ab);
+ if (ret) {
+ ath11k_err(ab, "failed to reconfigure driver on crash recovery\n");
+ return;
+ }
+
+ if (ab->is_reset)
+ complete_all(&ab->reconfigure_complete);
+
+ if (!ab->is_reset)
+ ath11k_core_post_reconfigure_recovery(ab);
+}
+
static void ath11k_core_reset(struct work_struct *work)
{
struct ath11k_base *ab = container_of(work, struct ath11k_base, reset_work);
@@ -1095,6 +1116,19 @@ static void ath11k_core_reset(struct work_struct *work)
ab->is_reset = true;
atomic_set(&ab->recovery_count, 0);
+ ath11k_core_pre_reconfigure_recovery(ab);
+
+ reinit_completion(&ab->reconfigure_complete);
+ ath11k_core_post_reconfigure_recovery(ab);
+
+ reinit_completion(&ab->recovery_start);
+ atomic_set(&ab->recovery_start_count, 0);
+
+ ath11k_dbg(ab, ATH11K_DBG_BOOT, "waiting recovery start...\n");
+
+ time_left = wait_for_completion_timeout(&ab->recovery_start,
+ ATH11K_RECOVER_START_TIMEOUT_HZ);
+
ath11k_hif_power_down(ab);
ath11k_qmi_free_resource(ab);
ath11k_hif_power_up(ab);
@@ -1198,6 +1232,8 @@ struct ath11k_base *ath11k_core_alloc(struct device *dev, size_t priv_size,
mutex_init(&ab->core_lock);
spin_lock_init(&ab->base_lock);
init_completion(&ab->reset_complete);
+ init_completion(&ab->reconfigure_complete);
+ init_completion(&ab->recovery_start);
INIT_LIST_HEAD(&ab->peers);
init_waitqueue_head(&ab->peer_mapping_wq);
diff --git a/drivers/net/wireless/ath/ath11k/core.h b/drivers/net/wireless/ath/ath11k/core.h
index 9a9f8f24d407..95b9ebcd0e35 100644
--- a/drivers/net/wireless/ath/ath11k/core.h
+++ b/drivers/net/wireless/ath/ath11k/core.h
@@ -43,6 +43,8 @@ extern unsigned int ath11k_frame_mode;
#define ATH11K_RESET_MAX_FAIL_COUNT_FIRST 3
#define ATH11K_RESET_MAX_FAIL_COUNT_FINAL 5
#define ATH11K_RESET_FAIL_TIMEOUT_HZ (20 * HZ)
+#define ATH11K_RECONFIGURE_TIMEOUT_HZ (10 * HZ)
+#define ATH11K_RECOVER_START_TIMEOUT_HZ (20 * HZ)
enum ath11k_supported_bw {
ATH11K_BW_20 = 0,
@@ -742,8 +744,11 @@ struct ath11k_base {
struct work_struct reset_work;
atomic_t reset_count;
atomic_t recovery_count;
+ atomic_t recovery_start_count;
bool is_reset;
struct completion reset_complete;
+ struct completion reconfigure_complete;
+ struct completion recovery_start;
/* continuous recovery fail count */
atomic_t fail_cont_count;
unsigned long reset_fail_timeout;
diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index b0a2f257f328..97d685b6fd14 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -4377,6 +4377,28 @@ static int ath11k_mac_config_mon_status_default(struct ath11k *ar, bool enable)
return ret;
}
+static void ath11k_mac_wait_reconfigure(struct ath11k_base *ab)
+{
+ long time_left;
+ int recovery_start_count;
+
+ if (!ab->is_reset)
+ return;
+
+ recovery_start_count = atomic_inc_return(&ab->recovery_start_count);
+ ath11k_dbg(ab, ATH11K_DBG_MAC, "recovery start count %d\n", recovery_start_count);
+
+ if (recovery_start_count == ab->num_radios) {
+ complete(&ab->recovery_start);
+ ath11k_dbg(ab, ATH11K_DBG_MAC, "recovery started success\n");
+ }
+
+ ath11k_dbg(ab, ATH11K_DBG_MAC, "waiting reconfigure...\n");
+
+ time_left = wait_for_completion_timeout(&ab->reconfigure_complete,
+ ATH11K_RECONFIGURE_TIMEOUT_HZ);
+}
+
static int ath11k_mac_op_start(struct ieee80211_hw *hw)
{
struct ath11k *ar = hw->priv;
@@ -4393,6 +4415,7 @@ static int ath11k_mac_op_start(struct ieee80211_hw *hw)
break;
case ATH11K_STATE_RESTARTING:
ar->state = ATH11K_STATE_RESTARTED;
+ ath11k_mac_wait_reconfigure(ab);
break;
case ATH11K_STATE_RESTARTED:
case ATH11K_STATE_WEDGED:
--
2.31.1
^ permalink raw reply related [flat|nested] 5+ messages in thread