linux-kernel - Re: [PATCH v5 1/9] PCI/P2PDMA: Separate the mmap() support from the core logic

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Message-ID: <aPHibioUFZV8Wnd1@infradead.org>
Date: Thu, 16 Oct 2025 23:30:06 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Alex Williamson <alex.williamson@...hat.com>,
	Leon Romanovsky <leonro@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Christian König <christian.koenig@....com>,
	dri-devel@...ts.freedesktop.org, iommu@...ts.linux.dev,
	Jens Axboe <axboe@...nel.dk>, Joerg Roedel <joro@...tes.org>,
	kvm@...r.kernel.org, linaro-mm-sig@...ts.linaro.org,
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linux-pci@...r.kernel.org, Logan Gunthorpe <logang@...tatee.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Vivek Kasireddy <vivek.kasireddy@...el.com>,
	Will Deacon <will@...nel.org>
Subject: Re: [PATCH v5 1/9] PCI/P2PDMA: Separate the mmap() support from the
 core logic

On Mon, Oct 13, 2025 at 06:26:03PM +0300, Leon Romanovsky wrote:
> The DMA API now has a new flow, and has gained phys_addr_t support, so
> it no longer needs struct pages to perform P2P mapping.

That's news to me.  All the pci_p2pdma_map_state machinery is still
based on pgmaps and thus pages.

> Lifecycle management can be delegated to the user, DMABUF for instance
> has a suitable invalidation protocol that does not require struct page.

How?