linux-kernel - Re: [PATCH v2 1/2] optee: fix tee out of memory failure seen during kexec reboot

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Date:   Thu, 18 Mar 2021 15:51:43 -0500
From:   Tyler Hicks <tyhicks@...ux.microsoft.com>
To:     Allen Pais <allen.lkml@...il.com>
Cc:     jens.wiklander@...aro.org, zajec5@...il.com,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        op-tee@...ts.trustedfirmware.org,
        Allen Pais <apais@...ux.microsoft.com>
Subject: Re: [PATCH v2 1/2] optee: fix tee out of memory failure seen during
 kexec reboot

On 2021-02-25 14:36:09, Allen Pais wrote:
> From: Allen Pais <apais@...ux.microsoft.com>
> 
> The following out of memory errors are seen on kexec reboot
> from the optee core.
> 
> [    0.368428] tee_bnxt_fw optee-clnt0: tee_shm_alloc failed
> [    0.368461] tee_bnxt_fw: probe of optee-clnt0 failed with error -22
> 
> tee_shm_release() is not invoked on dma shm buffer.
> 
> Implement .shutdown() method to handle the release of the buffers
> correctly.
> 
> More info:
> https://github.com/OP-TEE/optee_os/issues/3637
> 
> Signed-off-by: Allen Pais <apais@...ux.microsoft.com>
> ---
>  drivers/tee/optee/core.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index cf4718c6d35d..80e2774b5e2a 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -582,6 +582,13 @@ static optee_invoke_fn *get_invoke_func(struct device *dev)
>  	return ERR_PTR(-EINVAL);
>  }
>  
> +/* optee_remove - Device Removal Routine
> + * @pdev: platform device information struct
> + *
> + * optee_remove is called by platform subsystem to alter the driver
                                                      ^ alert?

> + * that it should release the device
> + */
> +
>  static int optee_remove(struct platform_device *pdev)
>  {
>  	struct optee *optee = platform_get_drvdata(pdev);
> @@ -612,6 +619,18 @@ static int optee_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +/* optee_shutdown - Device Removal Routine
> + * @pdev: platform device information struct
> + *
> + * platform_shutdown is called by the platform subsystem to alter
                                                               ^ alert

With those two changes,

Reviewed-by: Tyler Hicks <tyhicks@...ux.microsoft.com>

Tyler

> + * the driver that a shutdown/reboot(or kexec) is happening and
> + * device must be disabled.
> + */
> +static void optee_shutdown(struct platform_device *pdev)
> +{
> +	optee_disable_shm_cache(platform_get_drvdata(pdev));
> +}
> +
>  static int optee_probe(struct platform_device *pdev)
>  {
>  	optee_invoke_fn *invoke_fn;
> @@ -738,6 +757,7 @@ MODULE_DEVICE_TABLE(of, optee_dt_match);
>  static struct platform_driver optee_driver = {
>  	.probe  = optee_probe,
>  	.remove = optee_remove,
> +	.shutdown = optee_shutdown,
>  	.driver = {
>  		.name = "optee",
>  		.of_match_table = optee_dt_match,
> -- 
> 2.25.1
>