From: Greg KH <gregkh@linuxfoundation.org>
To: Jianxiong Gao <jxgao@google.com>
Cc: stable@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Marc Orr <marcorr@google.com>,
sashal@kernel.org
Subject: Re: [PATCH 5.4 v2 0/9] preserve DMA offsets when using swiotlb
Date: Wed, 19 May 2021 19:03:22 +0200 [thread overview]
Message-ID: <YKVE2kerpTzoeIL+@kroah.com> (raw)
In-Reply-To: <CAMGD6P1FBwYBnVPPSFtn0qgHbs+y=stZXhnYHjX82H+vqei+AQ@mail.gmail.com>
On Wed, May 19, 2021 at 09:42:42AM -0700, Jianxiong Gao wrote:
> On Wed, May 19, 2021 at 1:11 AM Greg KH <gregkh@linuxfoundation.org> wrote:
> >
> > I still fail to understand why you can not just use the 5.10.y kernel or
> > newer. What is preventing you from doing this if you wish to use this
> > type of hardware? This is not a "regression" in that the 5.4.y kernel
> > has never worked with this hardware before, it feels like a new feature.
> >
> NVMe + SWIOTLB is not a new feature. From my understanding it should
> be supported by 5.4.y kernel correctly. Currently without the patch, any
> NVMe device (along with some other devices that relies on offset to
> work correctly), could be broken if the SWIOTLB is used on a 5.4.y kernel.
Then do not do that, as obviously it never worked without your fixes, so
this isn't a "regression".
And again, why can you not just use 5.10.y?
thanks,
greg k-h
next prev parent reply other threads:[~2021-05-19 17:03 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-18 22:18 [PATCH 5.4 v2 0/9] preserve DMA offsets when using swiotlb Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 1/9] driver core: add a min_align_mask field to struct device_dma_parameters Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 2/9] swiotlb: add a IO_TLB_SIZE define Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 3/9] swiotlb: factor out an io_tlb_offset helper Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 4/9] swiotlb: factor out a nr_slots helper Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 5/9] swiotlb: clean up swiotlb_tbl_unmap_single Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 6/9] swiotlb: refactor swiotlb_tbl_map_single Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 7/9] swiotlb: don't modify orig_addr in swiotlb_tbl_sync_single Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 8/9] swiotlb: respect min_align_mask Jianxiong Gao
2021-05-18 22:18 ` [PATCH 5.4 v2 9/9] nvme-pci: set min_align_mask Jianxiong Gao
2021-05-19 8:11 ` [PATCH 5.4 v2 0/9] preserve DMA offsets when using swiotlb Greg KH
2021-05-19 16:42 ` Jianxiong Gao
2021-05-19 17:03 ` Greg KH [this message]
2021-05-19 17:18 ` Marc Orr
2021-05-19 17:25 ` Greg KH
2021-05-19 20:01 ` Marc Orr
2021-05-20 8:32 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YKVE2kerpTzoeIL+@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=hch@lst.de \
--cc=jxgao@google.com \
--cc=marcorr@google.com \
--cc=sashal@kernel.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.