tpm, tpm: Implement usage counter for locality

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Implement a usage counter for the (default) locality used by the TPM TIS
driver:
Request the locality from the TPM if it has not been claimed yet, otherwise
only increment the counter. Also release the locality if the counter is 0
otherwise only decrement the counter. Since in case of SPI the register
accesses are locked by means of the SPI bus mutex use a sleepable lock
(i.e. also a mutex) to ensure thread-safety of the counter which may be
accessed by both a userspace thread and the interrupt handler.

By doing this refactor the names of the amended functions to use a more
appropriate prefix.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@kunbus.com>
Tested-by: Michael Niewöhner <linux@mniewoehner.de>
Tested-by: Jarkko Sakkinen <jarkko@kernel.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

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This commit is contained in:

Lino Sanfilippo 2022-11-24 14:55:33 +01:00 • committed by Jarkko Sakkinen

parent 35f621287e

commit 7a2f55d0be

2 changed files with 47 additions and 18 deletions

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65

drivers/char/tpm/tpm_tis_core.c

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2

drivers/char/tpm/tpm_tis_core.h

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