linux-kernel - Re: [PATCH 1/2] habanalabs: add new IOCTL for debug, tracing and profiling

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Date:   Tue, 2 Apr 2019 15:43:10 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        Omer Shpigelman <oshpigelman@...ana.ai>
Subject: Re: [PATCH 1/2] habanalabs: add new IOCTL for debug, tracing and profiling

On Tue, Apr 2, 2019 at 3:01 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Tue, Apr 02, 2019 at 02:35:38PM +0300, Oded Gabbay wrote:
> > From: Omer Shpigelman <oshpigelman@...ana.ai>
> >
> > Habanalabs ASICs use the ARM coresight infrastructure to support debug,
> > tracing and profiling of neural networks topologies.
> >
> > Because the coresight is configured using register writes and reads, and
> > some of the registers hold sensitive information (e.g. the address in
> > the device's DRAM where the trace data is written to), the user must go
> > through the kernel driver to configure this mechanism.
> >
> > This patch implements the common code of the IOCTL and calls the
> > ASIC-specific function for the actual H/W configuration.
> >
> > The IOCTL supports configuration of seven coresight components:
> > ETR, ETF, STM, FUNNEL, BMON, SPMU and TIMESTAMP
> >
> > The user specifies which component he wishes to configure and provides a
> > pointer to a structure (located in its process space) that contains the
> > relevant configuration.
> >
> > The common code copies the relevant data from the user-space to kernel
> > space and then calls the ASIC-specific function to do the H/W
> > configuration.
> >
> > After the configuration is done, which is usually composed
> > of several IOCTL calls depending on what the user wanted to trace, the
> > user can start executing the topology. The trace data will be written to
> > the user's area in the device's DRAM.
> >
> > After the tracing operation is complete, and user will call the IOCTL
> > again to disable the tracing operation. The user also need to read
> > values from registers for some of the components (e.g. the size of the
> > trace data in the device's DRAM). In that case, the user will provide a
> > pointer to an "output" structure in user-space, which the IOCTL code will
> > fill according the to selected component.
> >
> > Signed-off-by: Omer Shpigelman <oshpigelman@...ana.ai>
> > Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
> > ---
> >  drivers/misc/habanalabs/device.c              |   2 +-
> >  drivers/misc/habanalabs/goya/Makefile         |   3 +-
> >  drivers/misc/habanalabs/goya/goya.c           |   1 +
> >  drivers/misc/habanalabs/goya/goyaP.h          |   1 +
> >  drivers/misc/habanalabs/goya/goya_coresight.c |  13 ++
> >  drivers/misc/habanalabs/habanalabs.h          |  25 ++++
> >  drivers/misc/habanalabs/habanalabs_ioctl.c    | 123 +++++++++++++++++-
> >  include/uapi/misc/habanalabs.h                | 116 ++++++++++++++++-
> >  8 files changed, 280 insertions(+), 4 deletions(-)
> >  create mode 100644 drivers/misc/habanalabs/goya/goya_coresight.c
> >
> > diff --git a/drivers/misc/habanalabs/device.c b/drivers/misc/habanalabs/device.c
> > index e3797f582436..6cbfd560721e 100644
> > --- a/drivers/misc/habanalabs/device.c
> > +++ b/drivers/misc/habanalabs/device.c
> > @@ -1044,7 +1044,7 @@ void hl_device_fini(struct hl_device *hdev)
> >                       WARN(1, "Failed to remove device because reset function did not finish\n");
> >                       return;
> >               }
> > -     };
> > +     }
> >
> >       /* Mark device as disabled */
> >       hdev->disabled = true;
>
> This change isn't part of this new feature :(
>
I'll split it up
Oded