From: Dan Williams <dan.j.williams@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: "Luck, Tony" <tony.luck@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
dmaengine@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Vinod Koul <vkoul@kernel.org>, Jing Lin <jing.lin@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
"Dey, Megha" <megha.dey@intel.com>,
"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
"Liu, Yi L" <yi.l.liu@intel.com>, Jens Axboe <axboe@kernel.dk>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Fenghua Yu <fenghua.yu@intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH RFC 01/14] x86/asm: add iosubmit_cmds512() based on movdir64b CPU instruction
Date: Wed, 20 Nov 2019 16:27:43 -0800 [thread overview]
Message-ID: <CAPcyv4gngO04iWuKu2_DV4_AXw5yssd6njTNKF=eKk+YJw3AfQ@mail.gmail.com> (raw)
In-Reply-To: <20191120232645.GO2634@zn.tnic>
On Wed, Nov 20, 2019 at 3:27 PM Borislav Petkov <bp@alien8.de> wrote:
>
> On Wed, Nov 20, 2019 at 03:19:23PM -0800, Luck, Tony wrote:
> > That's the underlying functionality of the MOVDIR64B instruction. A
> > posted write so no way to know if it succeeded.
>
> So how do you know whether any of the writes went through?
It's identical to the writel() mmio-write to start a SATA command
transfer. The higher level device driver protocol validates that the
command went through, ultimately with a timeout. There's no return
value for iosubmit_cmds512() for the same reason there's no return
value for the other iowrite primitives.
next prev parent reply other threads:[~2019-11-21 0:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-20 21:23 [PATCH RFC 00/14] idxd driver for Intel Data Streaming Accelerator Dave Jiang
2019-11-20 21:23 ` [PATCH RFC 01/14] x86/asm: add iosubmit_cmds512() based on movdir64b CPU instruction Dave Jiang
2019-11-20 21:50 ` Dave Hansen
2019-11-20 23:46 ` Dave Jiang
2019-11-20 21:53 ` Borislav Petkov
2019-11-20 23:19 ` Luck, Tony
2019-11-20 23:26 ` Borislav Petkov
2019-11-21 0:15 ` Luck, Tony
2019-11-21 0:27 ` Dan Williams [this message]
2019-11-21 0:53 ` Thomas Gleixner
2019-11-21 1:32 ` Dan Williams
2019-11-21 10:37 ` Borislav Petkov
2019-11-21 0:21 ` Dan Williams
2019-11-21 0:22 ` Thomas Gleixner
2019-11-21 0:27 ` Dave Jiang
2019-11-21 0:10 ` Dave Jiang
2019-11-21 10:59 ` Borislav Petkov
2019-11-21 16:52 ` Dave Jiang
2019-11-22 8:59 ` Borislav Petkov
2019-11-22 17:20 ` Dan Williams
2019-11-22 18:44 ` Borislav Petkov
2019-11-22 18:50 ` Dan Williams
2019-11-20 21:23 ` [PATCH RFC 02/14] dmaengine: break out channel registration Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 03/14] dmaengine: add new dma device registration Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 04/14] mm: create common code from request allocation based from blk-mq code Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 05/14] dmaengine: add dma_request support functions Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 06/14] dmaengine: add dma request submit and completion path support Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 07/14] dmaengine: update dmatest to support dma request Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 08/14] dmaengine: idxd: Init and probe for Intel data accelerators Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 09/14] dmaengine: idxd: add configuration component of driver Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 10/14] dmaengine: idxd: add descriptor manipulation routines Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 11/14] dmaengine: idxd: connect idxd to dmaengine subsystem Dave Jiang
2019-11-20 21:24 ` [PATCH RFC 12/14] dmaengine: request submit optimization Dave Jiang
2019-11-20 21:25 ` [PATCH RFC 13/14] dmaengine: idxd: add char driver to expose submission portal to userland Dave Jiang
2019-11-20 21:25 ` [PATCH RFC 14/14] dmaengine: idxd: add sysfs ABI for idxd driver Dave Jiang
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