pt., 31 mar 2023 o 13:53 Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
napisał(a):
>
> On 3/30/23 01:07, Mario Limonciello wrote:
> > Currently the PSP semaphore communication base address is discovered
> > by using an MSR that is not architecturally guaranteed for future
> > platforms. Also the mailbox that is utilized for communication with
> > the PSP may have other consumers in the kernel, so it's better to
> > make all communication go through a single driver.
> >
> > Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
> > ---
> > v6->v7:
> > * Also imply CRYPTO_DEV_CCP_DD to fix build errors
> > * Fix error message acquire/release inversion
> > v5->v6:
> > * Drop now unnecessary asm/msr.h header
> > * Fix IS_REACHABLE
> > * Drop tags
> > * Fix status code handling for Cezanne
> > v4->v5:
> > * Pick up tags
> > v3->v4:
> > * Pick up tags
> > v1->v2:
> > * Fix Kconfig to use imply
> > * Use IS_REACHABLE
> > ---
> > drivers/i2c/busses/Kconfig | 3 +-
> > drivers/i2c/busses/i2c-designware-amdpsp.c | 177 +++-----------------
> > drivers/i2c/busses/i2c-designware-core.h | 1 -
> > drivers/i2c/busses/i2c-designware-platdrv.c | 1 -
> > include/linux/psp-platform-access.h | 1 +
> > 5 files changed, 29 insertions(+), 154 deletions(-)
> >
> One note below in case there is a need to have another version of if you
> want. Not a show stopper for this.
>
> Acked-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
>
> > @@ -214,7 +95,7 @@ static int psp_send_i2c_req(enum psp_i2c_req_type i2c_req_type)
> > if (ret) {
> > dev_err(psp_i2c_dev, "Timed out waiting for PSP to %s I2C bus\n",
> > (i2c_req_type == PSP_I2C_REQ_ACQUIRE) ?
> > - "release" : "acquire");
> > + "acquire" : "release");
> > goto cleanup;
> > }
> >
> This looks like worth of being an own patch. Maybe even for the
> linux-stable. I think it's very useful to have an error message to show
> correct information what operation actually failed.
Msg here is "TImed out waiting for _PSP to_ %s I2C bus" - when x86
wants to ACQUIRE the bus (i2c_req_type == PSP_I2C_REQ_ACQUIRE) then
PSP needs to RELEASE it and vice versa. If you think logic here is not
straightforward and should be adjusted, then we need to change the
whole sentence.
