linux-kernel - Re: [PATCH v2 1/4] ACPI: PCC: Add PCC shared memory region command and status bitfields

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Date:   Tue, 3 Oct 2023 17:05:51 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-acpi@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Huisong Li <lihuisong@...wei.com>
Subject: Re: [PATCH v2 1/4] ACPI: PCC: Add PCC shared memory region command
 and status bitfields

On Tue, Oct 3, 2023 at 4:29 PM Sudeep Holla <sudeep.holla@....com> wrote:
>
> On Tue, Oct 03, 2023 at 03:29:16PM +0200, Rafael J. Wysocki wrote:
> > On Wed, Sep 27, 2023 at 6:32 PM Sudeep Holla <sudeep.holla@....com> wrote:
> > >
> > > Define the common macros to use when referring to various bitfields in
> > > the PCC generic communications channel command and status fields.
> > >
> > > Currently different drivers that need to use these bitfields have defined
> > > these locally. This common macro is intended to consolidate and replace
> > > those.
> > >
> > > Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > > Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> > > ---
> > >  include/acpi/pcc.h | 13 +++++++++++++
> > >  1 file changed, 13 insertions(+)
> > >
> > > diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h
> > > index 73e806fe7ce7..021891a7434f 100644
> > > --- a/include/acpi/pcc.h
> > > +++ b/include/acpi/pcc.h
> > > @@ -18,7 +18,20 @@ struct pcc_mbox_chan {
> > >         u16 min_turnaround_time;
> > >  };
> > >
> > > +/* Generic Communications Channel Shared Memory Region */
> > > +#define PCC_SIGNATURE                  0x50424300
> > > +/* Generic Communications Channel Command Field */
> > > +#define PCC_CMD_GENERATE_DB_INTR       BIT(15)
> > > +/* Generic Communications Channel Status Field */
> > > +#define PCC_STATUS_CMD_COMPLETE                BIT(0)
> > > +#define PCC_STATUS_SCI_DOORBELL                BIT(1)
> > > +#define PCC_STATUS_ERROR               BIT(2)
> > > +#define PCC_STATUS_PLATFORM_NOTIFY     BIT(3)
> > > +/* Initiator Responder Communications Channel Flags */
> > > +#define PCC_CMD_COMPLETION_NOTIFY      BIT(0)
> > > +
> > >  #define MAX_PCC_SUBSPACES      256
> > > +
> > >  #ifdef CONFIG_PCC
> > >  extern struct pcc_mbox_chan *
> > >  pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id);
> > >
> > > --
> >
> > Do you want me to pick up this lot?
>
> I have applied this to me branch [1]. It also has long pending PCC driver
> changes. I will send the pull request by end of this week.

Sounds good, thanks!