From: sashiko-bot@kernel.org
To: "Koichiro Den" <den@valinux.co.jp>
Cc: linux-pci@vger.kernel.org
Subject: Re: [PATCH v10 06/10] PCI: endpoint: pci-epf-vntb: Allow DMA and MW to share a BAR
Date: Fri, 13 Nov 2026 14:00:51 +0000 [thread overview]
Message-ID: <sashiko-outbox-212945@kernel.org> (raw)
In-Reply-To: <20261113132935.4152566-7-den@valinux.co.jp>
> Some endpoint configurations have no spare BAR for DMA resources. Allow
> dma_bar to select an MW BAR and place the DMA ranges after that MW.
>
> DMA submaps have fixed BAR offsets, so a shared MW translation must
> cover its configured size. Keep the power-of-two restriction used for
> ordinary MWs. The size must also meet the EPC's alignment requirement
> for the following DMA submaps.
>
> Older hosts treat the whole BAR as an MW. Fall back to that layout when
> LINK_UP does not advertise MW/DMA boundary support, so that NTB keeps
> working without DMA: the enumerated BAR size is kept, the MW spans the
> whole BAR and the DMA submaps are removed.
>
> Reviewed-by: Frank Li <Frank.Li@nxp.com>
> Signed-off-by: Koichiro Den <den@valinux.co.jp>
Sashiko has reviewed this patch and found no issues.
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261113132935.4152566-1-den@valinux.co.jp?part=6
next prev parent reply other threads:[~2026-11-13 14:00 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-13 13:29 [PATCH v10 00/10] PCI: endpoint: Remote DMA support via vNTB Koichiro Den
2026-11-13 13:29 ` [PATCH v10 01/10] PCI: endpoint: Add DMA auxiliary resource metadata Koichiro Den
2026-11-13 13:36 ` sashiko-bot
2026-11-13 13:29 ` [PATCH v10 02/10] PCI: dwc: Expose endpoint DMA resources Koichiro Den
2026-11-13 14:01 ` sashiko-bot
2026-11-13 13:29 ` [PATCH v10 03/10] PCI: endpoint: pci-epf-vntb: Move epf_ntb_is_bar_used() up Koichiro Den
2026-11-13 13:33 ` sashiko-bot
2026-11-13 13:29 ` [PATCH v10 04/10] PCI: endpoint: Add pci-epf-ntb.h for the shared NTB control layout Koichiro Den
2026-11-13 13:37 ` sashiko-bot
2026-11-13 13:29 ` [PATCH v10 05/10] PCI: endpoint: pci-epf-vntb: Export endpoint DMA channels Koichiro Den
2026-11-13 14:00 ` sashiko-bot
2026-11-13 13:29 ` [PATCH v10 06/10] PCI: endpoint: pci-epf-vntb: Allow DMA and MW to share a BAR Koichiro Den
2026-11-13 14:00 ` sashiko-bot [this message]
2026-11-13 13:29 ` [PATCH v10 07/10] Documentation: PCI: endpoint: Document vNTB DMA export Koichiro Den
2026-11-13 13:29 ` [PATCH v10 08/10] NTB: ntb_hw_epf: Use the shared NTB control layout Koichiro Den
2026-11-13 13:29 ` [PATCH v10 09/10] NTB: ntb_hw_epf: Discover vNTB-embedded DMA Koichiro Den
2026-11-13 13:29 ` [PATCH v10 10/10] NTB: ntb_hw_epf: Support DMA and MW sharing a BAR Koichiro Den
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