[PATCH v3] ath10k: Don't always treat modem stop events as crashes

[PATCH v3] ath10k: Don't always treat modem stop events as crashes

[Stephen Boyd]

When rebooting on sc7180 Trogdor devices I see the following crash from
the wifi driver.

 ath10k_snoc 18800000.wifi: firmware crashed! (guid 83493570-29a2-4e98-a83e-70048c47669c)

This is because a modem stop event looks just like a firmware crash to
the driver, the qmi connection is closed in both cases. Use the qcom ssr
notifier block to stop treating the qmi connection close event as a
firmware crash signal when the modem hasn't actually crashed. See
ath10k_qmi_event_server_exit() for more details.

This silences the crash message seen during every reboot.

Fixes: 3f14b73c3843 ("ath10k: Enable MSA region dump support for WCN3990")
Cc: Youghandhar Chintala <youghand@codeaurora.org>
Cc: Abhishek Kumar <kuabhs@chromium.org>
Cc: Steev Klimaszewski <steev@kali.org>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Rakesh Pillai <pillair@codeaurora.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---

Changes since v2 (https://lore.kernel.org/r/20210913205313.3420049-1-swboyd@chromium.org):
 * Use a new bit instead of overloading unregistering

Changes since v1 (https://lore.kernel.org/r/20210905210400.1157870-1-swboyd@chromium.org):
 * Push error message into function instead of checking at callsite

 drivers/net/wireless/ath/ath10k/qmi.c  |  3 +-
 drivers/net/wireless/ath/ath10k/snoc.c | 77 ++++++++++++++++++++++++++
 drivers/net/wireless/ath/ath10k/snoc.h |  5 ++
 3 files changed, 84 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath10k/qmi.c b/drivers/net/wireless/ath/ath10k/qmi.c
index 07e478f9a808..80fcb917fe4e 100644
--- a/drivers/net/wireless/ath/ath10k/qmi.c
+++ b/drivers/net/wireless/ath/ath10k/qmi.c
@@ -864,7 +864,8 @@ static void ath10k_qmi_event_server_exit(struct ath10k_qmi *qmi)
 
 	ath10k_qmi_remove_msa_permission(qmi);
 	ath10k_core_free_board_files(ar);
-	if (!test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc->flags))
+	if (!test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc->flags) &&
+	    !test_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags))
 		ath10k_snoc_fw_crashed_dump(ar);
 
 	ath10k_snoc_fw_indication(ar, ATH10K_QMI_EVENT_FW_DOWN_IND);
diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
index ea00fbb15601..9513ab696fff 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.c
+++ b/drivers/net/wireless/ath/ath10k/snoc.c
@@ -12,6 +12,7 @@
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>
+#include <linux/remoteproc/qcom_rproc.h>
 #include <linux/of_address.h>
 #include <linux/iommu.h>
 
@@ -1477,6 +1478,74 @@ void ath10k_snoc_fw_crashed_dump(struct ath10k *ar)
 	mutex_unlock(&ar->dump_mutex);
 }
 
+static int ath10k_snoc_modem_notify(struct notifier_block *nb, unsigned long action,
+				    void *data)
+{
+	struct ath10k_snoc *ar_snoc = container_of(nb, struct ath10k_snoc, nb);
+	struct ath10k *ar = ar_snoc->ar;
+	struct qcom_ssr_notify_data *notify_data = data;
+
+	switch (action) {
+	case QCOM_SSR_BEFORE_POWERUP:
+		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem starting event\n");
+		clear_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags);
+		break;
+
+	case QCOM_SSR_AFTER_POWERUP:
+		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem running event\n");
+		break;
+
+	case QCOM_SSR_BEFORE_SHUTDOWN:
+		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem %s event\n",
+			   notify_data->crashed ? "crashed" : "stopping");
+		if (!notify_data->crashed)
+			set_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags);
+		else
+			clear_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags);
+		break;
+
+	case QCOM_SSR_AFTER_SHUTDOWN:
+		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem offline event\n");
+		break;
+
+	default:
+		ath10k_err(ar, "received unrecognized event %lu\n", action);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+static int ath10k_modem_init(struct ath10k *ar)
+{
+	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
+	void *notifier;
+	int ret;
+
+	ar_snoc->nb.notifier_call = ath10k_snoc_modem_notify;
+
+	notifier = qcom_register_ssr_notifier("mpss", &ar_snoc->nb);
+	if (IS_ERR(notifier)) {
+		ret = PTR_ERR(notifier);
+		ath10k_err(ar, "failed to initialize modem notifier: %d\n", ret);
+		return ret;
+	}
+
+	ar_snoc->notifier = notifier;
+
+	return 0;
+}
+
+static void ath10k_modem_deinit(struct ath10k *ar)
+{
+	int ret;
+	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
+
+	ret = qcom_unregister_ssr_notifier(ar_snoc->notifier, &ar_snoc->nb);
+	if (ret)
+		ath10k_err(ar, "error %d unregistering notifier\n", ret);
+}
+
 static int ath10k_setup_msa_resources(struct ath10k *ar, u32 msa_size)
 {
 	struct device *dev = ar->dev;
@@ -1740,10 +1809,17 @@ static int ath10k_snoc_probe(struct platform_device *pdev)
 		goto err_fw_deinit;
 	}
 
+	ret = ath10k_modem_init(ar);
+	if (ret)
+		goto err_qmi_deinit;
+
 	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc probe\n");
 
 	return 0;
 
+err_qmi_deinit:
+	ath10k_qmi_deinit(ar);
+
 err_fw_deinit:
 	ath10k_fw_deinit(ar);
 
@@ -1771,6 +1847,7 @@ static int ath10k_snoc_free_resources(struct ath10k *ar)
 	ath10k_fw_deinit(ar);
 	ath10k_snoc_free_irq(ar);
 	ath10k_snoc_release_resource(ar);
+	ath10k_modem_deinit(ar);
 	ath10k_qmi_deinit(ar);
 	ath10k_core_destroy(ar);
 
diff --git a/drivers/net/wireless/ath/ath10k/snoc.h b/drivers/net/wireless/ath/ath10k/snoc.h
index 5095d1893681..d4bce1707696 100644
--- a/drivers/net/wireless/ath/ath10k/snoc.h
+++ b/drivers/net/wireless/ath/ath10k/snoc.h
@@ -6,6 +6,8 @@
 #ifndef _SNOC_H_
 #define _SNOC_H_
 
+#include <linux/notifier.h>
+
 #include "hw.h"
 #include "ce.h"
 #include "qmi.h"
@@ -45,6 +47,7 @@ struct ath10k_snoc_ce_irq {
 enum ath10k_snoc_flags {
 	ATH10K_SNOC_FLAG_REGISTERED,
 	ATH10K_SNOC_FLAG_UNREGISTERING,
+	ATH10K_SNOC_FLAG_MODEM_STOPPED,
 	ATH10K_SNOC_FLAG_RECOVERY,
 	ATH10K_SNOC_FLAG_8BIT_HOST_CAP_QUIRK,
 };
@@ -75,6 +78,8 @@ struct ath10k_snoc {
 	struct clk_bulk_data *clks;
 	size_t num_clks;
 	struct ath10k_qmi *qmi;
+	struct notifier_block nb;
+	void *notifier;
 	unsigned long flags;
 	bool xo_cal_supported;
 	u32 xo_cal_data;

base-commit: e4e737bb5c170df6135a127739a9e6148ee3da82
-- 
https://chromeos.dev

RE: [PATCH v3] ath10k: Don't always treat modem stop events as crashes

[pillair]

> -----Original Message-----
> From: Stephen Boyd <swboyd@chromium.org>
> Sent: Thursday, September 23, 2021 5:04 AM
> To: Kalle Valo <kvalo@codeaurora.org>
> Cc: linux-kernel@vger.kernel.org; ath10k@lists.infradead.org; linux-
> wireless@vger.kernel.org; netdev@vger.kernel.org; linux-arm-
> msm@vger.kernel.org; Youghandhar Chintala <youghand@codeaurora.org>;
> Abhishek Kumar <kuabhs@chromium.org>; Steev Klimaszewski
> <steev@kali.org>; Matthias Kaehlcke <mka@chromium.org>; Rakesh Pillai
> <pillair@codeaurora.org>
> Subject: [PATCH v3] ath10k: Don't always treat modem stop events as
> crashes
> 
> When rebooting on sc7180 Trogdor devices I see the following crash from
the
> wifi driver.
> 
>  ath10k_snoc 18800000.wifi: firmware crashed! (guid 83493570-29a2-4e98-
> a83e-70048c47669c)
> 
> This is because a modem stop event looks just like a firmware crash to the
> driver, the qmi connection is closed in both cases. Use the qcom ssr
notifier
> block to stop treating the qmi connection close event as a firmware crash
> signal when the modem hasn't actually crashed. See
> ath10k_qmi_event_server_exit() for more details.
> 
> This silences the crash message seen during every reboot.
> 
> Fixes: 3f14b73c3843 ("ath10k: Enable MSA region dump support for
> WCN3990")
> Cc: Youghandhar Chintala <youghand@codeaurora.org>
> Cc: Abhishek Kumar <kuabhs@chromium.org>
> Cc: Steev Klimaszewski <steev@kali.org>
> Cc: Matthias Kaehlcke <mka@chromium.org>
> Cc: Rakesh Pillai <pillair@codeaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> ---
> 
> Changes since v2 (https://lore.kernel.org/r/20210913205313.3420049-1-
> swboyd@chromium.org):
>  * Use a new bit instead of overloading unregistering
> 
> Changes since v1 (https://lore.kernel.org/r/20210905210400.1157870-1-
> swboyd@chromium.org):
>  * Push error message into function instead of checking at callsite
> 
>  drivers/net/wireless/ath/ath10k/qmi.c  |  3 +-
> drivers/net/wireless/ath/ath10k/snoc.c | 77
> ++++++++++++++++++++++++++  drivers/net/wireless/ath/ath10k/snoc.h |
> 5 ++
>  3 files changed, 84 insertions(+), 1 deletion(-)

Reviewed-by: Rakesh Pillai <pillair@codeaurora.org>




> 
> diff --git a/drivers/net/wireless/ath/ath10k/qmi.c
> b/drivers/net/wireless/ath/ath10k/qmi.c
> index 07e478f9a808..80fcb917fe4e 100644
> --- a/drivers/net/wireless/ath/ath10k/qmi.c
> +++ b/drivers/net/wireless/ath/ath10k/qmi.c
> @@ -864,7 +864,8 @@ static void ath10k_qmi_event_server_exit(struct
> ath10k_qmi *qmi)
> 
>  	ath10k_qmi_remove_msa_permission(qmi);
>  	ath10k_core_free_board_files(ar);
> -	if (!test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc-
> >flags))
> +	if (!test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc-
> >flags) &&
> +	    !test_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc-
> >flags))
>  		ath10k_snoc_fw_crashed_dump(ar);
> 
>  	ath10k_snoc_fw_indication(ar,
> ATH10K_QMI_EVENT_FW_DOWN_IND); diff --git
> a/drivers/net/wireless/ath/ath10k/snoc.c
> b/drivers/net/wireless/ath/ath10k/snoc.c
> index ea00fbb15601..9513ab696fff 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.c
> +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> @@ -12,6 +12,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/property.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/remoteproc/qcom_rproc.h>
>  #include <linux/of_address.h>
>  #include <linux/iommu.h>
> 
> @@ -1477,6 +1478,74 @@ void ath10k_snoc_fw_crashed_dump(struct
> ath10k *ar)
>  	mutex_unlock(&ar->dump_mutex);
>  }
> 
> +static int ath10k_snoc_modem_notify(struct notifier_block *nb, unsigned
> long action,
> +				    void *data)
> +{
> +	struct ath10k_snoc *ar_snoc = container_of(nb, struct ath10k_snoc,
> nb);
> +	struct ath10k *ar = ar_snoc->ar;
> +	struct qcom_ssr_notify_data *notify_data = data;
> +
> +	switch (action) {
> +	case QCOM_SSR_BEFORE_POWERUP:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem
> starting event\n");
> +		clear_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED,
> &ar_snoc->flags);
> +		break;
> +
> +	case QCOM_SSR_AFTER_POWERUP:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem
> running event\n");
> +		break;
> +
> +	case QCOM_SSR_BEFORE_SHUTDOWN:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem %s
> event\n",
> +			   notify_data->crashed ? "crashed" : "stopping");
> +		if (!notify_data->crashed)
> +			set_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED,
> &ar_snoc->flags);
> +		else
> +			clear_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED,
> &ar_snoc->flags);
> +		break;
> +
> +	case QCOM_SSR_AFTER_SHUTDOWN:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem
> offline event\n");
> +		break;
> +
> +	default:
> +		ath10k_err(ar, "received unrecognized event %lu\n", action);
> +		break;
> +	}
> +
> +	return NOTIFY_OK;
> +}
> +
> +static int ath10k_modem_init(struct ath10k *ar) {
> +	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
> +	void *notifier;
> +	int ret;
> +
> +	ar_snoc->nb.notifier_call = ath10k_snoc_modem_notify;
> +
> +	notifier = qcom_register_ssr_notifier("mpss", &ar_snoc->nb);
> +	if (IS_ERR(notifier)) {
> +		ret = PTR_ERR(notifier);
> +		ath10k_err(ar, "failed to initialize modem notifier: %d\n",
> ret);
> +		return ret;
> +	}
> +
> +	ar_snoc->notifier = notifier;
> +
> +	return 0;
> +}
> +
> +static void ath10k_modem_deinit(struct ath10k *ar) {
> +	int ret;
> +	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
> +
> +	ret = qcom_unregister_ssr_notifier(ar_snoc->notifier, &ar_snoc-
> >nb);
> +	if (ret)
> +		ath10k_err(ar, "error %d unregistering notifier\n", ret); }
> +
>  static int ath10k_setup_msa_resources(struct ath10k *ar, u32 msa_size)  {
>  	struct device *dev = ar->dev;
> @@ -1740,10 +1809,17 @@ static int ath10k_snoc_probe(struct
> platform_device *pdev)
>  		goto err_fw_deinit;
>  	}
> 
> +	ret = ath10k_modem_init(ar);
> +	if (ret)
> +		goto err_qmi_deinit;
> +
>  	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc probe\n");
> 
>  	return 0;
> 
> +err_qmi_deinit:
> +	ath10k_qmi_deinit(ar);
> +
>  err_fw_deinit:
>  	ath10k_fw_deinit(ar);
> 
> @@ -1771,6 +1847,7 @@ static int ath10k_snoc_free_resources(struct
> ath10k *ar)
>  	ath10k_fw_deinit(ar);
>  	ath10k_snoc_free_irq(ar);
>  	ath10k_snoc_release_resource(ar);
> +	ath10k_modem_deinit(ar);
>  	ath10k_qmi_deinit(ar);
>  	ath10k_core_destroy(ar);
> 
> diff --git a/drivers/net/wireless/ath/ath10k/snoc.h
> b/drivers/net/wireless/ath/ath10k/snoc.h
> index 5095d1893681..d4bce1707696 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.h
> +++ b/drivers/net/wireless/ath/ath10k/snoc.h
> @@ -6,6 +6,8 @@
>  #ifndef _SNOC_H_
>  #define _SNOC_H_
> 
> +#include <linux/notifier.h>
> +
>  #include "hw.h"
>  #include "ce.h"
>  #include "qmi.h"
> @@ -45,6 +47,7 @@ struct ath10k_snoc_ce_irq {  enum ath10k_snoc_flags {
>  	ATH10K_SNOC_FLAG_REGISTERED,
>  	ATH10K_SNOC_FLAG_UNREGISTERING,
> +	ATH10K_SNOC_FLAG_MODEM_STOPPED,
>  	ATH10K_SNOC_FLAG_RECOVERY,
>  	ATH10K_SNOC_FLAG_8BIT_HOST_CAP_QUIRK,
>  };
> @@ -75,6 +78,8 @@ struct ath10k_snoc {
>  	struct clk_bulk_data *clks;
>  	size_t num_clks;
>  	struct ath10k_qmi *qmi;
> +	struct notifier_block nb;
> +	void *notifier;
>  	unsigned long flags;
>  	bool xo_cal_supported;
>  	u32 xo_cal_data;
> 
> base-commit: e4e737bb5c170df6135a127739a9e6148ee3da82
> --
> https://chromeos.dev

Re: [PATCH v3] ath10k: Don't always treat modem stop events as crashes

[Youghandhar Chintala]

I pulled the latest patch changes and tested them on SC7180. Which works 
as expected.
Do not see this error message during reboot and can be seen while doing 
SSR.

Tested-By: Youghandhar Chintala <youghand@codeaurora.org>

On 2021-09-23 05:03, Stephen Boyd wrote:
> When rebooting on sc7180 Trogdor devices I see the following crash from
> the wifi driver.
> 
>  ath10k_snoc 18800000.wifi: firmware crashed! (guid
> 83493570-29a2-4e98-a83e-70048c47669c)
> 
> This is because a modem stop event looks just like a firmware crash to
> the driver, the qmi connection is closed in both cases. Use the qcom 
> ssr
> notifier block to stop treating the qmi connection close event as a
> firmware crash signal when the modem hasn't actually crashed. See
> ath10k_qmi_event_server_exit() for more details.
> 
> This silences the crash message seen during every reboot.
> 
> Fixes: 3f14b73c3843 ("ath10k: Enable MSA region dump support for 
> WCN3990")
> Cc: Youghandhar Chintala <youghand@codeaurora.org>
> Cc: Abhishek Kumar <kuabhs@chromium.org>
> Cc: Steev Klimaszewski <steev@kali.org>
> Cc: Matthias Kaehlcke <mka@chromium.org>
> Cc: Rakesh Pillai <pillair@codeaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> ---
> 
> Changes since v2
> (https://lore.kernel.org/r/20210913205313.3420049-1-swboyd@chromium.org):
>  * Use a new bit instead of overloading unregistering
> 
> Changes since v1
> (https://lore.kernel.org/r/20210905210400.1157870-1-swboyd@chromium.org):
>  * Push error message into function instead of checking at callsite
> 
>  drivers/net/wireless/ath/ath10k/qmi.c  |  3 +-
>  drivers/net/wireless/ath/ath10k/snoc.c | 77 ++++++++++++++++++++++++++
>  drivers/net/wireless/ath/ath10k/snoc.h |  5 ++
>  3 files changed, 84 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/ath10k/qmi.c
> b/drivers/net/wireless/ath/ath10k/qmi.c
> index 07e478f9a808..80fcb917fe4e 100644
> --- a/drivers/net/wireless/ath/ath10k/qmi.c
> +++ b/drivers/net/wireless/ath/ath10k/qmi.c
> @@ -864,7 +864,8 @@ static void ath10k_qmi_event_server_exit(struct
> ath10k_qmi *qmi)
> 
>  	ath10k_qmi_remove_msa_permission(qmi);
>  	ath10k_core_free_board_files(ar);
> -	if (!test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc->flags))
> +	if (!test_bit(ATH10K_SNOC_FLAG_UNREGISTERING, &ar_snoc->flags) &&
> +	    !test_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags))
>  		ath10k_snoc_fw_crashed_dump(ar);
> 
>  	ath10k_snoc_fw_indication(ar, ATH10K_QMI_EVENT_FW_DOWN_IND);
> diff --git a/drivers/net/wireless/ath/ath10k/snoc.c
> b/drivers/net/wireless/ath/ath10k/snoc.c
> index ea00fbb15601..9513ab696fff 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.c
> +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> @@ -12,6 +12,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/property.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/remoteproc/qcom_rproc.h>
>  #include <linux/of_address.h>
>  #include <linux/iommu.h>
> 
> @@ -1477,6 +1478,74 @@ void ath10k_snoc_fw_crashed_dump(struct ath10k 
> *ar)
>  	mutex_unlock(&ar->dump_mutex);
>  }
> 
> +static int ath10k_snoc_modem_notify(struct notifier_block *nb,
> unsigned long action,
> +				    void *data)
> +{
> +	struct ath10k_snoc *ar_snoc = container_of(nb, struct ath10k_snoc, 
> nb);
> +	struct ath10k *ar = ar_snoc->ar;
> +	struct qcom_ssr_notify_data *notify_data = data;
> +
> +	switch (action) {
> +	case QCOM_SSR_BEFORE_POWERUP:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem starting event\n");
> +		clear_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags);
> +		break;
> +
> +	case QCOM_SSR_AFTER_POWERUP:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem running event\n");
> +		break;
> +
> +	case QCOM_SSR_BEFORE_SHUTDOWN:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem %s event\n",
> +			   notify_data->crashed ? "crashed" : "stopping");
> +		if (!notify_data->crashed)
> +			set_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags);
> +		else
> +			clear_bit(ATH10K_SNOC_FLAG_MODEM_STOPPED, &ar_snoc->flags);
> +		break;
> +
> +	case QCOM_SSR_AFTER_SHUTDOWN:
> +		ath10k_dbg(ar, ATH10K_DBG_SNOC, "received modem offline event\n");
> +		break;
> +
> +	default:
> +		ath10k_err(ar, "received unrecognized event %lu\n", action);
> +		break;
> +	}
> +
> +	return NOTIFY_OK;
> +}
> +
> +static int ath10k_modem_init(struct ath10k *ar)
> +{
> +	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
> +	void *notifier;
> +	int ret;
> +
> +	ar_snoc->nb.notifier_call = ath10k_snoc_modem_notify;
> +
> +	notifier = qcom_register_ssr_notifier("mpss", &ar_snoc->nb);
> +	if (IS_ERR(notifier)) {
> +		ret = PTR_ERR(notifier);
> +		ath10k_err(ar, "failed to initialize modem notifier: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ar_snoc->notifier = notifier;
> +
> +	return 0;
> +}
> +
> +static void ath10k_modem_deinit(struct ath10k *ar)
> +{
> +	int ret;
> +	struct ath10k_snoc *ar_snoc = ath10k_snoc_priv(ar);
> +
> +	ret = qcom_unregister_ssr_notifier(ar_snoc->notifier, &ar_snoc->nb);
> +	if (ret)
> +		ath10k_err(ar, "error %d unregistering notifier\n", ret);
> +}
> +
>  static int ath10k_setup_msa_resources(struct ath10k *ar, u32 msa_size)
>  {
>  	struct device *dev = ar->dev;
> @@ -1740,10 +1809,17 @@ static int ath10k_snoc_probe(struct
> platform_device *pdev)
>  		goto err_fw_deinit;
>  	}
> 
> +	ret = ath10k_modem_init(ar);
> +	if (ret)
> +		goto err_qmi_deinit;
> +
>  	ath10k_dbg(ar, ATH10K_DBG_SNOC, "snoc probe\n");
> 
>  	return 0;
> 
> +err_qmi_deinit:
> +	ath10k_qmi_deinit(ar);
> +
>  err_fw_deinit:
>  	ath10k_fw_deinit(ar);
> 
> @@ -1771,6 +1847,7 @@ static int ath10k_snoc_free_resources(struct 
> ath10k *ar)
>  	ath10k_fw_deinit(ar);
>  	ath10k_snoc_free_irq(ar);
>  	ath10k_snoc_release_resource(ar);
> +	ath10k_modem_deinit(ar);
>  	ath10k_qmi_deinit(ar);
>  	ath10k_core_destroy(ar);
> 
> diff --git a/drivers/net/wireless/ath/ath10k/snoc.h
> b/drivers/net/wireless/ath/ath10k/snoc.h
> index 5095d1893681..d4bce1707696 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.h
> +++ b/drivers/net/wireless/ath/ath10k/snoc.h
> @@ -6,6 +6,8 @@
>  #ifndef _SNOC_H_
>  #define _SNOC_H_
> 
> +#include <linux/notifier.h>
> +
>  #include "hw.h"
>  #include "ce.h"
>  #include "qmi.h"
> @@ -45,6 +47,7 @@ struct ath10k_snoc_ce_irq {
>  enum ath10k_snoc_flags {
>  	ATH10K_SNOC_FLAG_REGISTERED,
>  	ATH10K_SNOC_FLAG_UNREGISTERING,
> +	ATH10K_SNOC_FLAG_MODEM_STOPPED,
>  	ATH10K_SNOC_FLAG_RECOVERY,
>  	ATH10K_SNOC_FLAG_8BIT_HOST_CAP_QUIRK,
>  };
> @@ -75,6 +78,8 @@ struct ath10k_snoc {
>  	struct clk_bulk_data *clks;
>  	size_t num_clks;
>  	struct ath10k_qmi *qmi;
> +	struct notifier_block nb;
> +	void *notifier;
>  	unsigned long flags;
>  	bool xo_cal_supported;
>  	u32 xo_cal_data;
> 
> base-commit: e4e737bb5c170df6135a127739a9e6148ee3da82


Regards,
Youghandhar
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member
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Re: [PATCH v3] ath10k: Don't always treat modem stop events as crashes

[Kalle Valo]

Youghandhar Chintala <youghand@codeaurora.org> writes:

> I pulled the latest patch changes and tested them on SC7180. Which
> works as expected.
> Do not see this error message during reboot and can be seen while
> doing SSR.
>
> Tested-By: Youghandhar Chintala <youghand@codeaurora.org>

Thanks for testing. But this style of replies makes it hard to use
patchwork:

https://patchwork.kernel.org/project/linux-wireless/patch/20210922233341.182624-1-swboyd@chromium.org/

So please do not top post and always edit your quotes, thank you, Same
request also to Rakesh.

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https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH v3] ath10k: Don't always treat modem stop events as crashes

[Kalle Valo]

Stephen Boyd <swboyd@chromium.org> wrote:

> When rebooting on sc7180 Trogdor devices I see the following crash from
> the wifi driver.
> 
>  ath10k_snoc 18800000.wifi: firmware crashed! (guid 83493570-29a2-4e98-a83e-70048c47669c)
> 
> This is because a modem stop event looks just like a firmware crash to
> the driver, the qmi connection is closed in both cases. Use the qcom ssr
> notifier block to stop treating the qmi connection close event as a
> firmware crash signal when the modem hasn't actually crashed. See
> ath10k_qmi_event_server_exit() for more details.
> 
> This silences the crash message seen during every reboot.
> 
> Fixes: 3f14b73c3843 ("ath10k: Enable MSA region dump support for WCN3990")
> Cc: Youghandhar Chintala <youghand@codeaurora.org>
> Cc: Abhishek Kumar <kuabhs@chromium.org>
> Cc: Steev Klimaszewski <steev@kali.org>
> Cc: Matthias Kaehlcke <mka@chromium.org>
> Cc: Rakesh Pillai <pillair@codeaurora.org>
> Signed-off-by: Stephen Boyd <swboyd@chromium.org>
> Reviewed-by: Rakesh Pillai <pillair@codeaurora.org>
> Tested-By: Youghandhar Chintala <youghand@codeaurora.org>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

747ff7d3d742 ath10k: Don't always treat modem stop events as crashes

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