linux-kernel - Re: [PATCH v3 4/4] mfd: intel-m10-bmc: Manage access to MAX 10 fw handshake registers

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Date:   Mon, 15 May 2023 11:06:15 +0100
From:   Lee Jones <lee@...nel.org>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc:     Xu Yilun <yilun.xu@...el.com>, Wu Hao <hao.wu@...el.com>,
        Tom Rix <trix@...hat.com>, Moritz Fischer <mdf@...nel.org>,
        linux-fpga@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Russ Weight <russell.h.weight@...el.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-hwmon@...r.kernel.org
Subject: Re: [PATCH v3 4/4] mfd: intel-m10-bmc: Manage access to MAX 10 fw
 handshake registers

On Wed, 10 May 2023, Ilpo Järvinen wrote:

> On Thu, 27 Apr 2023, Lee Jones wrote:
> > On Mon, 17 Apr 2023, Ilpo Järvinen wrote:
> > > On some MAX 10 cards, the BMC firmware is not available to service
> > > handshake registers during secure update erase and write phases at
> > > normal speeds. This problem affects at least hwmon driver. When the MAX
> > > 10 hwmon driver tries to read the sensor values during a secure update,
> > > the reads are slowed down (e.g., reading all D5005 sensors takes ~24s
> > > which is magnitudes worse than the normal <0.02s).
> > > 
> > > Manage access to the handshake registers using a rw semaphore and a FW
> > > state variable to prevent accesses during those secure update phases
> > > and return -EBUSY instead.
> > > 
> > > If handshake_sys_reg_nranges == 0, don't update bwcfw_state as it is not
> > > used. This avoids the locking cost.
> > > 
> > > Co-developed-by: Russ Weight <russell.h.weight@...el.com>
> > > Signed-off-by: Russ Weight <russell.h.weight@...el.com>
> > > Co-developed-by: Xu Yilun <yilun.xu@...el.com>
> > > Signed-off-by: Xu Yilun <yilun.xu@...el.com>
> > > Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> > > ---
> > >  drivers/fpga/intel-m10-bmc-sec-update.c | 17 +++++--
> > >  drivers/mfd/intel-m10-bmc-core.c        | 67 ++++++++++++++++++++++++-
> > >  drivers/mfd/intel-m10-bmc-spi.c         | 14 ++++++
> > >  include/linux/mfd/intel-m10-bmc.h       | 28 +++++++++++
> > >  4 files changed, 121 insertions(+), 5 deletions(-)
> > 
> > Applied, thanks
> 
> Did these end up falling throught the cracks as I've not been able to 
> locate where they were applied?

They've been in -next for a couple of weeks.

-- 
Lee Jones [李琼斯]