From: "Xia, Chenbo" <chenbo.xia@intel.com>
To: "skori@marvell.com" <skori@marvell.com>, Ray Kinsella <mdr@ashroe.eu>
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: RE: [PATCH 1/2] doc: announce region based device mapping support
Date: Thu, 7 Jul 2022 12:39:14 +0000 [thread overview]
Message-ID: <SN6PR11MB3504C8656B2C899F4C1E234E9C839@SN6PR11MB3504.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20220628135339.2882914-1-skori@marvell.com>
Hi Sunil,
> -----Original Message-----
> From: skori@marvell.com <skori@marvell.com>
> Sent: Tuesday, June 28, 2022 9:54 PM
> To: Ray Kinsella <mdr@ashroe.eu>
> Cc: dev@dpdk.org; Sunil Kumar Kori <skori@marvell.com>
> Subject: [PATCH 1/2] doc: announce region based device mapping support
>
> From: Sunil Kumar Kori <skori@marvell.com>
>
> Adding region based device mapping support, which enables pci device
> to map only required memory region instead of mapping full BAR.
Why there will be such requirement to mmap only part of BAR when the BAR
can be fully mmapped. I thought you want to enable something like sparse
mmap feature in VFIO, but seems it's a feature that let driver ask for
specific mmap option. Could you explain the use case here?
Thanks,
Chenbo
>
> Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
> ---
> doc/guides/rel_notes/deprecation.rst | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/doc/guides/rel_notes/deprecation.rst
> b/doc/guides/rel_notes/deprecation.rst
> index 4e5b23c53d..8800a3eb41 100644
> --- a/doc/guides/rel_notes/deprecation.rst
> +++ b/doc/guides/rel_notes/deprecation.rst
> @@ -125,3 +125,16 @@ Deprecation Notices
> applications should be updated to use the ``dmadev`` library instead,
> with the underlying HW-functionality being provided by the ``ioat`` or
> ``idxd`` dma drivers
> +
> +* pci: Update ``rte_pci_device`` and ``rte_pci_driver`` to add region
> based
> + memory mapping support. There could be a requirement to mmap specific
> memory
> + region only. Using this mechanism, pci device can be mapped for
> + a given BAR at a given offset of given size.
> +
> + ``rte_pci_device`` will be added with following field
> + ``regions[PCI_MAX_RESOURCE][PCI_MAX_REGION_PER_RESOURCE];``. This field
> will
> + specify the regions which are mapped for a given BAR.
> +
> + ``rte_pci_driver`` will be added with ``rte_pci_region_map *regions``
> and
> + ``valid_bars[PCI_MAX_RESOURCE]``. Using these fields, driver can
> propagate
> + its region information which are required to be mmap.
> --
> 2.25.1
next prev parent reply other threads:[~2022-07-07 12:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-28 13:53 skori
2022-06-28 13:53 ` [PATCH 2/2] bus/pci: support region based device mapping skori
2022-07-07 10:07 ` [PATCH 1/2] doc: announce region based device mapping support Sunil Kumar Kori
2022-07-07 12:39 ` Xia, Chenbo [this message]
2022-07-13 7:03 ` Sunil Kumar Kori
2022-07-13 7:27 ` Xia, Chenbo
2022-07-13 7:38 ` Sunil Kumar Kori
2022-07-13 7:18 ` David Marchand
2022-07-13 7:21 ` Xia, Chenbo
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