From: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-ntb@googlegroups.com, linux-alpha@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-crypto@vger.kernel.org,
dri-devel@lists.freedesktop.org, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Stephen Bates <sbates@raithlin.com>,
Richard Henderson <rth@twiddle.net>,
Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
Matt Turner <mattst88@gmail.com>
Subject: Re: [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations
Date: Thu, 22 Jun 2017 21:08:28 +0100 [thread overview]
Message-ID: <20170622210828.27304f6a@alans-desktop> (raw)
In-Reply-To: <20170622164817.25515-5-logang@deltatee.com>
On Thu, 22 Jun 2017 10:48:14 -0600
Logan Gunthorpe <logang@deltatee.com> wrote:
> Alpha implements its own io operation and doesn't use the
> common library. Thus to make ioread64 and iowrite64 globally
> available we need to add implementations for alpha.
>
> For this, we simply use calls that chain two 32-bit operations.
> (mostly because I don't really understand the alpha architecture.)
But this does not do the same thing as an ioread64 with regards to
atomicity or side effects on the device. The same is true of the other
hacks. You either have a real 64bit single read/write from MMIO space or
you don't. You can't fake it.
Alan
next prev parent reply other threads:[~2017-06-22 20:57 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-22 16:48 [PATCH 0/7] cleanup issues with io{read|write}64 Logan Gunthorpe
2017-06-22 16:48 ` [PATCH 1/7] drm/tilcdc: don't use volatile with iowrite64 Logan Gunthorpe
2017-06-26 8:54 ` Jyri Sarha
2017-06-22 16:48 ` [PATCH 2/7] iomap: implement ioread64 and iowrite64 Logan Gunthorpe
2017-06-26 20:43 ` Arnd Bergmann
2017-06-26 21:25 ` Logan Gunthorpe
2017-06-22 16:48 ` [PATCH 3/7] asm-generic/io.h: make ioread64 and iowrite64 universally available Logan Gunthorpe
2017-06-22 20:14 ` Alan Cox
2017-06-22 20:24 ` Logan Gunthorpe
2017-06-22 20:36 ` Alan Cox
2017-06-22 20:38 ` Logan Gunthorpe
2017-06-22 16:48 ` [PATCH 4/7] alpha: provide ioread64 and iowrite64 implementations Logan Gunthorpe
2017-06-22 17:29 ` Stephen Bates
2017-06-22 17:30 ` Logan Gunthorpe
2017-06-22 20:08 ` Alan Cox [this message]
2017-06-22 20:09 ` Logan Gunthorpe
2017-06-22 21:03 ` Arnd Bergmann
2017-06-22 21:10 ` Logan Gunthorpe
2017-06-22 21:20 ` Richard Henderson
2017-06-22 16:48 ` [PATCH 5/7] ntb: ntb_hw_intel: remove ioread64 and iowrite64 hacks Logan Gunthorpe
2017-06-22 17:17 ` Jiang, Dave
2017-06-22 16:48 ` [PATCH 6/7] drm/tilcdc: clean up ifdef hacks around iowrite64 Logan Gunthorpe
2017-06-26 8:55 ` Jyri Sarha
2017-06-26 16:26 ` Logan Gunthorpe
2017-06-27 20:40 ` Arnd Bergmann
2017-06-22 16:48 ` [PATCH 7/7] crypto: caam: cleanup CONFIG_64BIT ifdefs when using io{read|write}64 Logan Gunthorpe
2017-06-23 6:51 ` Horia Geantă
2017-06-23 17:59 ` Logan Gunthorpe
2017-06-24 11:57 ` [PATCH v2 " Horia Geantă
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