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Date:   Sat, 16 May 2020 00:11:55 -0400
From:   Rafael Aquini <aquini@...hat.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     jeyu@...nel.org, akpm@...ux-foundation.org, arnd@...db.de,
        rostedt@...dmis.org, mingo@...hat.com, cai@....pw,
        dyoung@...hat.com, bhe@...hat.com, peterz@...radead.org,
        tglx@...utronix.de, gpiccoli@...onical.com, pmladek@...e.com,
        tiwai@...e.de, schlad@...e.de, andriy.shevchenko@...ux.intel.com,
        keescook@...omium.org, daniel.vetter@...ll.ch, will@...nel.org,
        mchehab+samsung@...nel.org, kvalo@...eaurora.org,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        ath10k@...ts.infradead.org
Subject: Re: [PATCH v2 12/15] ath10k: use new module_firmware_crashed()

On Fri, May 15, 2020 at 09:28:43PM +0000, Luis Chamberlain wrote:
> This makes use of the new module_firmware_crashed() to help
> annotate when firmware for device drivers crash. When firmware
> crashes devices can sometimes become unresponsive, and recovery
> sometimes requires a driver unload / reload and in the worst cases
> a reboot.
> 
> Using a taint flag allows us to annotate when this happens clearly.
> 
> Cc: linux-wireless@...r.kernel.org
> Cc: ath10k@...ts.infradead.org
> Cc: Kalle Valo <kvalo@...eaurora.org>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  drivers/net/wireless/ath/ath10k/pci.c  | 2 ++
>  drivers/net/wireless/ath/ath10k/sdio.c | 2 ++
>  drivers/net/wireless/ath/ath10k/snoc.c | 1 +
>  3 files changed, 5 insertions(+)
> 
> diff --git a/drivers/net/wireless/ath/ath10k/pci.c b/drivers/net/wireless/ath/ath10k/pci.c
> index 1d941d53fdc9..6bd0f3b518b9 100644
> --- a/drivers/net/wireless/ath/ath10k/pci.c
> +++ b/drivers/net/wireless/ath/ath10k/pci.c
> @@ -1767,6 +1767,7 @@ static void ath10k_pci_fw_dump_work(struct work_struct *work)
>  		scnprintf(guid, sizeof(guid), "n/a");
>  
>  	ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
> +	module_firmware_crashed();
>  	ath10k_print_driver_info(ar);
>  	ath10k_pci_dump_registers(ar, crash_data);
>  	ath10k_ce_dump_registers(ar, crash_data);
> @@ -2837,6 +2838,7 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar,
>  	if (ret) {
>  		if (ath10k_pci_has_fw_crashed(ar)) {
>  			ath10k_warn(ar, "firmware crashed during chip reset\n");
> +			module_firmware_crashed();
>  			ath10k_pci_fw_crashed_clear(ar);
>  			ath10k_pci_fw_crashed_dump(ar);
>  		}
> diff --git a/drivers/net/wireless/ath/ath10k/sdio.c b/drivers/net/wireless/ath/ath10k/sdio.c
> index e2aff2254a40..d34ad289380f 100644
> --- a/drivers/net/wireless/ath/ath10k/sdio.c
> +++ b/drivers/net/wireless/ath/ath10k/sdio.c
> @@ -794,6 +794,7 @@ static int ath10k_sdio_mbox_proc_dbg_intr(struct ath10k *ar)
>  
>  	/* TODO: Add firmware crash handling */
>  	ath10k_warn(ar, "firmware crashed\n");
> +	module_firmware_crashed();
>  
>  	/* read counter to clear the interrupt, the debug error interrupt is
>  	 * counter 0.
> @@ -915,6 +916,7 @@ static int ath10k_sdio_mbox_proc_cpu_intr(struct ath10k *ar)
>  	if (cpu_int_status & MBOX_CPU_STATUS_ENABLE_ASSERT_MASK) {
>  		ath10k_err(ar, "firmware crashed!\n");
>  		queue_work(ar->workqueue, &ar->restart_work);
> +		module_firmware_crashed();
>  	}
>  	return ret;
>  }
> diff --git a/drivers/net/wireless/ath/ath10k/snoc.c b/drivers/net/wireless/ath/ath10k/snoc.c
> index 354d49b1cd45..7cfc123c345c 100644
> --- a/drivers/net/wireless/ath/ath10k/snoc.c
> +++ b/drivers/net/wireless/ath/ath10k/snoc.c
> @@ -1451,6 +1451,7 @@ void ath10k_snoc_fw_crashed_dump(struct ath10k *ar)
>  		scnprintf(guid, sizeof(guid), "n/a");
>  
>  	ath10k_err(ar, "firmware crashed! (guid %s)\n", guid);
> +	module_firmware_crashed();
>  	ath10k_print_driver_info(ar);
>  	ath10k_msa_dump_memory(ar, crash_data);
>  	mutex_unlock(&ar->dump_mutex);
> -- 
> 2.26.2
> 
Acked-by: Rafael Aquini <aquini@...hat.com>

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