All of lore.kernel.org
 help / color / mirror / Atom feed
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Roman Skakun <rm.skakun@gmail.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	xen-devel@lists.xenproject.org, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
	Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>,
	Volodymyr Babchuk <volodymyr_babchuk@epam.com>,
	Roman Skakun <roman_skakun@epam.com>,
	Andrii Anisov <andrii_anisov@epam.com>
Subject: Re: [PATCH] swiotlb-xen: override common mmap and get_sgtable dma ops
Date: Mon, 14 Jun 2021 11:45:46 -0400	[thread overview]
Message-ID: <fbaeaad5-ea8a-ff2d-2e62-d27b4d234e8e@oracle.com> (raw)
In-Reply-To: <CADu_u-MqALJkG8RJHrr65vC_sHu-UyvCGwwUfaBong0eir5+hQ@mail.gmail.com>


On 6/14/21 8:47 AM, Roman Skakun wrote:
> Hey, Boris!
> Thanks for the review.
>
> I have an additional question about current implementation that disturbed me.
> I think, that we can have cases when mapped memory can not be
> physically contiguous.
> In order to proceed this correctly need to apply some additional steps
> to current implementation as well.
>
> In mmap() :
> 1. Is the memory region physically contiguous?
> 2. Remap multiple ranges if it is not.
>
> In get_sgtable() :
> 1. Is the memory region physically contiguous?
> 2. Create sgt that will be included multiple contiguous ranges if it is not.
>
> What do you think about it?


We make sure that we allocate contiguous memory in xen_swiotlb_alloc_coherent().


-boris



WARNING: multiple messages have this Message-ID
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Roman Skakun <rm.skakun@gmail.com>
Cc: Juergen Gross <jgross@suse.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Andrii Anisov <andrii_anisov@epam.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>,
	linux-kernel@vger.kernel.org,
	Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
	iommu@lists.linux-foundation.org,
	Roman Skakun <roman_skakun@epam.com>,
	xen-devel@lists.xenproject.org,
	Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Subject: Re: [PATCH] swiotlb-xen: override common mmap and get_sgtable dma ops
Date: Mon, 14 Jun 2021 11:45:46 -0400	[thread overview]
Message-ID: <fbaeaad5-ea8a-ff2d-2e62-d27b4d234e8e@oracle.com> (raw)
In-Reply-To: <CADu_u-MqALJkG8RJHrr65vC_sHu-UyvCGwwUfaBong0eir5+hQ@mail.gmail.com>


On 6/14/21 8:47 AM, Roman Skakun wrote:
> Hey, Boris!
> Thanks for the review.
>
> I have an additional question about current implementation that disturbed me.
> I think, that we can have cases when mapped memory can not be
> physically contiguous.
> In order to proceed this correctly need to apply some additional steps
> to current implementation as well.
>
> In mmap() :
> 1. Is the memory region physically contiguous?
> 2. Remap multiple ranges if it is not.
>
> In get_sgtable() :
> 1. Is the memory region physically contiguous?
> 2. Create sgt that will be included multiple contiguous ranges if it is not.
>
> What do you think about it?


We make sure that we allocate contiguous memory in xen_swiotlb_alloc_coherent().


-boris


_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  reply	other threads:[~2021-06-14 15:46 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-11  9:55 [PATCH] swiotlb-xen: override common mmap and get_sgtable dma ops Roman Skakun
2021-06-11  9:55 ` Roman Skakun
2021-06-11 15:19 ` Boris Ostrovsky
2021-06-11 15:19   ` Boris Ostrovsky
2021-06-14 12:47   ` Roman Skakun
2021-06-14 12:47     ` Roman Skakun
2021-06-14 12:47     ` Roman Skakun
2021-06-14 15:45     ` Boris Ostrovsky [this message]
2021-06-14 15:45       ` Boris Ostrovsky
2021-06-16 11:45       ` Roman Skakun
2021-06-16 11:45         ` Roman Skakun
2021-06-16 11:45         ` Roman Skakun
2021-06-16 11:42   ` [PATCH 1/2] Revert "swiotlb-xen: remove xen_swiotlb_dma_mmap and xen_swiotlb_dma_get_sgtable" Roman Skakun
2021-06-16 11:42     ` Roman Skakun
2021-06-16 11:42     ` [PATCH 2/2] swiotlb-xen: override common mmap and get_sgtable dma ops Roman Skakun
2021-06-16 11:42       ` Roman Skakun
2021-06-16 14:12       ` Boris Ostrovsky
2021-06-16 14:12         ` Boris Ostrovsky
2021-06-16 14:21         ` Christoph Hellwig
2021-06-16 14:21           ` Christoph Hellwig
2021-06-16 15:33           ` Boris Ostrovsky
2021-06-16 15:33             ` Boris Ostrovsky
2021-06-16 15:35             ` Christoph Hellwig
2021-06-16 15:35               ` Christoph Hellwig
2021-06-16 15:39               ` Boris Ostrovsky
2021-06-16 15:39                 ` Boris Ostrovsky
2021-06-16 15:44                 ` Christoph Hellwig
2021-06-16 15:44                   ` Christoph Hellwig
2021-06-22 13:34                   ` [PATCH v2] dma-mapping: use vmalloc_to_page for vmalloc addresses Roman Skakun
2021-06-22 13:34                     ` Roman Skakun
2021-07-14  0:15                     ` Konrad Rzeszutek Wilk
2021-07-14  0:15                       ` Konrad Rzeszutek Wilk
2021-07-15  7:39                       ` Roman Skakun
2021-07-15  7:39                         ` Roman Skakun
2021-07-15  7:39                         ` Roman Skakun
2021-07-15 16:58                         ` Boris Ostrovsky
2021-07-15 16:58                           ` Boris Ostrovsky
2021-07-15 17:00                           ` Christoph Hellwig
2021-07-15 17:00                             ` Christoph Hellwig
2021-07-16  8:39                             ` Roman Skakun
2021-07-16  8:39                               ` Roman Skakun
2021-07-16  9:35                               ` Christoph Hellwig
2021-07-16  9:35                                 ` Christoph Hellwig
2021-07-16 12:53                                 ` Roman Skakun
2021-07-16 12:53                                   ` Roman Skakun
2021-07-16 12:53                                   ` Roman Skakun
2021-07-16 15:29                                   ` Stefano Stabellini
2021-07-16 15:29                                     ` Stefano Stabellini
2021-07-16 15:29                                     ` Stefano Stabellini
2021-07-17  8:39                                     ` Roman Skakun
2021-07-17  8:39                                       ` Roman Skakun
2021-07-17  8:39                                       ` Roman Skakun
2021-07-19  9:22                                       ` Christoph Hellwig
2021-07-19  9:22                                         ` Christoph Hellwig
2021-07-21 18:39                                         ` Roman Skakun
2021-07-21 18:39                                           ` Roman Skakun
2021-07-21 18:39                                           ` Roman Skakun
2021-07-14  1:23                     ` Stefano Stabellini
2021-07-14  1:23                       ` Stefano Stabellini
2021-07-14  1:23                       ` Stefano Stabellini
2021-07-15  7:31                       ` Roman Skakun
2021-07-15  7:31                         ` Roman Skakun
2021-07-15  7:31                         ` Roman Skakun

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=fbaeaad5-ea8a-ff2d-2e62-d27b4d234e8e@oracle.com \
    --to=boris.ostrovsky@oracle.com \
    --cc=andrii_anisov@epam.com \
    --cc=iommu@lists.linux-foundation.org \
    --cc=jgross@suse.com \
    --cc=konrad.wilk@oracle.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=oleksandr_andrushchenko@epam.com \
    --cc=oleksandr_tyshchenko@epam.com \
    --cc=rm.skakun@gmail.com \
    --cc=roman_skakun@epam.com \
    --cc=sstabellini@kernel.org \
    --cc=volodymyr_babchuk@epam.com \
    --cc=xen-devel@lists.xenproject.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.