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From: Julius Werner <jwerner@chromium.org>
To: swboyd@chromium.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Wei-Ning Huang <wnhuang@chromium.org>,
	Julius Werner <jwerner@chromium.org>,
	Brian Norris <briannorris@chromium.org>,
	samuel@sholland.org
Subject: Re: [PATCH v3 7/7] firmware: coreboot: Request table region for exclusive access
Date: Thu, 9 Aug 2018 14:07:31 -0700
Message-ID: <CAODwPW8eg2WOh9-Raeb8Q65E-5D7RDheDU8e+H68FHGa0MS37A@mail.gmail.com> (raw)
In-Reply-To: <20180809171722.144325-8-swboyd@chromium.org>

On Thu, Aug 9, 2018 at 10:17 AM Stephen Boyd <swboyd@chromium.org> wrote:
>
> Call request_mem_region() on the entire coreboot table to make sure
> other devices don't attempt to map the coreboot table in their drivers.
> If drivers need that support, it would be better to provide bus APIs
> they can use to do that through the mapping created in this file.
>

Does this prevent userspace from mapping this region via /dev/mem? If
so, let's please not do it to not break compatibility with existing
tools. (I guess an alternative would be to rewrite 'cbmem' to use
/sys/bus/coreboot/devices if available to get its coreboot table
information. But we'd still need to maintain the old path for
backwards compatibility anyway, so that would really just make it more
complicated.)

  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-09 17:17 [PATCH v3 0/7] firmware: coreboot: Fix probe and simplify code Stephen Boyd
2018-08-09 17:17 ` [PATCH v3 1/7] firmware: coreboot: Let OF core populate platform device Stephen Boyd
2018-08-09 17:31   ` Brian Norris
2018-08-09 17:17 ` [PATCH v3 2/7] firmware: coreboot: Unmap ioregion on failure Stephen Boyd
2018-08-09 17:49   ` Brian Norris
2018-08-09 19:40     ` Stephen Boyd
2018-08-09 19:52       ` Brian Norris
2018-08-09 23:25         ` Stephen Boyd
2018-08-09 17:17 ` [PATCH v3 3/7] firmware: coreboot: Make bus registration symmetric Stephen Boyd
2018-08-09 18:10   ` Julius Werner
2018-08-09 23:30     ` Stephen Boyd
2018-08-09 17:17 ` [PATCH v3 4/7] firmware: coreboot: Collapse platform drivers into bus core Stephen Boyd
2018-08-09 17:17 ` [PATCH v3 5/7] firmware: coreboot: Remap RAM with memremap() instead of ioremap() Stephen Boyd
2018-08-09 18:24   ` Julius Werner
2018-08-09 22:07     ` Stephen Boyd
2018-08-09 17:17 ` [PATCH v3 6/7] firmware: coreboot: Only populate devices in coreboot_table_init() Stephen Boyd
2018-08-09 21:02   ` Julius Werner
2018-08-09 23:43     ` Stephen Boyd
2018-08-09 17:17 ` [PATCH v3 7/7] firmware: coreboot: Request table region for exclusive access Stephen Boyd
2018-08-09 21:07   ` Julius Werner [this message]
2018-08-09 23:03     ` Stephen Boyd
2018-08-09 23:37       ` Julius Werner
2018-08-09 23:44         ` Julius Werner
2018-08-10  2:54           ` Stephen Boyd
2018-08-10 23:24             ` Stephen Boyd
2018-08-09 18:03 ` [PATCH v3 0/7] firmware: coreboot: Fix probe and simplify code Brian Norris

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