linux-kernel - Re: [PATCH v1 0/1] tpm_ffa_crb: handle tpm busy return code

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Message-ID: <aEdLc_OpTNvsk5pl@kernel.org>
Date: Tue, 10 Jun 2025 00:00:35 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Prachotan Bathi <prachotan.bathi@....com>
Cc: Peter Huewe <peterhuewe@....de>, Jason Gunthorpe <jgg@...pe.ca>,
	Stuart Yoder <stuart.yoder@....com>,
	linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 0/1] tpm_ffa_crb: handle tpm busy return code

On Mon, Jun 09, 2025 at 09:15:59AM -0500, Prachotan Bathi wrote:
> Platforms supporting direct message request v2 can
> support SPs that support multiple services.

What is "direct message request v2"?

> If the TPM service is sharing the SP with another service,
> it could get an error code of BUSY if the other service is
> in process.
> We need a way for the driver to retry sending the message
> to the TPM service until it succeeds or we know that no forward progress
> can be made.
> This patch adds a parameterized variable (default 2000ms)
> that indicates the maximum time to keep retrying for.
> 
> Prachotan Bathi (1):
>   tpm_ffa_crb: handle tpm busy return code
> 
>  drivers/char/tpm/tpm_crb_ffa.c | 74 +++++++++++++++++++++++-----------
>  1 file changed, 50 insertions(+), 24 deletions(-)
> 
> -- 
> 2.43.0
> 
> 

BR, Jarkko