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Date:   Tue, 5 Jul 2022 18:12:40 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Jason Gunthorpe <jgg@ziepe.ca>
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Subject: Re: [PATCH v7 20/21] PCI/P2PDMA: Introduce pci_mmap_p2pmem()
Message-ID: <20220705161240.GB13721@lst.de>
References: <20220615161233.17527-1-logang@deltatee.com> <20220615161233.17527-21-logang@deltatee.com> <20220629064854.GD17576@lst.de> <99242789-66a6-bbd2-b56a-e47891f4522e@deltatee.com> <20220629175906.GU23621@ziepe.ca> <20220705075108.GB17451@lst.de> <20220705135102.GE23621@ziepe.ca>
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On Tue, Jul 05, 2022 at 10:51:02AM -0300, Jason Gunthorpe wrote:
> > In fact I'm not even sure this should be a character device, it seems
> > to fit it way better with the PCI sysfs hierchacy, just like how we
> > map MMIO resources, which these are anyway.  And once it is on sysfs
> > we do have a uniqueue inode and need none of the pseudofs stuff, and
> > don't need all the glue code in nvme either.
> 
> Shouldn't there be an allocator here? It feels a bit weird that the
> entire CMB is given to a single process, it is a sharable resource,
> isn't it?

Making the entire area given by the device to the p2p allocator available
to user space seems sensible to me.  That is what the current series does,
and what a sysfs interface would do as well.