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

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Message-ID: <20250609141600.3601340-1-prachotan.bathi@arm.com>
Date: Mon,  9 Jun 2025 09:15:59 -0500
From: Prachotan Bathi <prachotan.bathi@....com>
To: Peter Huewe <peterhuewe@....de>,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Stuart Yoder <stuart.yoder@....com>
Cc: linux-integrity@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Prachotan Bathi <prachotan.bathi@....com>
Subject: [PATCH v1 0/1] tpm_ffa_crb: handle tpm busy return code

Platforms supporting direct message request v2 can
support SPs that support multiple services.
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