linux-kernel - Re: [PATCH v2 01/15] staging: vc04_services: Add new vc-sm-cma driver

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Message-ID: <20231115195634.GC29486@pendragon.ideasonboard.com>
Date:   Wed, 15 Nov 2023 21:56:34 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Stefan Wahren <stefan.wahren@...e.com>
Cc:     Umang Jain <umang.jain@...asonboard.com>,
        linux-media@...r.kernel.org, kernel-list@...pberrypi.com,
        linux-kernel@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        "Ricardo B . Marliere" <ricardo@...liere.net>,
        Dan Carpenter <error27@...il.com>
Subject: Re: [PATCH v2 01/15] staging: vc04_services: Add new vc-sm-cma driver

On Mon, Nov 13, 2023 at 06:56:06PM +0100, Stefan Wahren wrote:
> Hi Umang,
> 
> Am 09.11.23 um 22:02 schrieb Umang Jain:
> > From: Dave Stevenson <dave.stevenson@...pberrypi.com>
> > 
> > Add Broadcom VideoCore Shared Memory support.
> > 
> > This new driver allows contiguous memory blocks to be imported
> > into the VideoCore VPU memory map, and manages the lifetime of
> > those objects, only releasing the source dmabuf once the VPU has
> > confirmed it has finished with it.
> > 
> > Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> > Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
> > ---
> >   drivers/staging/vc04_services/Kconfig         |   2 +
> >   drivers/staging/vc04_services/Makefile        |   2 +-
> >   .../staging/vc04_services/vc-sm-cma/Kconfig   |  10 +
> >   .../staging/vc04_services/vc-sm-cma/Makefile  |   4 +
> >   .../staging/vc04_services/vc-sm-cma/vc_sm.c   | 817 ++++++++++++++++++
> >   .../staging/vc04_services/vc-sm-cma/vc_sm.h   |  54 ++
> >   .../vc04_services/vc-sm-cma/vc_sm_cma_vchi.c  | 507 +++++++++++
> >   .../vc04_services/vc-sm-cma/vc_sm_cma_vchi.h  |  63 ++
> >   .../vc04_services/vc-sm-cma/vc_sm_defs.h      | 187 ++++
> >   .../vc04_services/vc-sm-cma/vc_sm_knl.h       |  28 +
> >   10 files changed, 1673 insertions(+), 1 deletion(-)
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/Kconfig
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/Makefile
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm.h
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.c
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_cma_vchi.h
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_defs.h
> >   create mode 100644 drivers/staging/vc04_services/vc-sm-cma/vc_sm_knl.h

[snip]

> > diff --git a/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
> > new file mode 100644
> > index 000000000000..5bbdb3a8468b
> > --- /dev/null
> > +++ b/drivers/staging/vc04_services/vc-sm-cma/vc_sm.c
> > @@ -0,0 +1,817 @@

[snip]

> > +/* ---- Private Variables ----------------------------------------------- */
> > +
> > +static struct sm_state_t *sm_state;
> > +static int sm_inited;
> 
> In case the driver cannot be loaded again, a comment about this should 
> be here.

Better, could we remove global variables ?

[snip]

-- 
Regards,

Laurent Pinchart