From mboxrd@z Thu Jan  1 00:00:00 1970
From: hch@lst.de (Christoph Hellwig)
Date: Wed, 24 Jul 2019 08:32:29 +0200
Subject: [PATCH 07/14] PCI/P2PDMA: Add the provider's pci_dev to the
 dev_pgmap struct
In-Reply-To: <20190722230859.5436-8-logang@deltatee.com>
References: <20190722230859.5436-1-logang@deltatee.com>
 <20190722230859.5436-8-logang@deltatee.com>
Message-ID: <20190724063229.GA1804@lst.de>

On Mon, Jul 22, 2019@05:08:52PM -0600, Logan Gunthorpe wrote:
> diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
> index 143e11d2a5c3..70c262b7c731 100644
> --- a/drivers/pci/p2pdma.c
> +++ b/drivers/pci/p2pdma.c
> @@ -168,6 +168,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
>  	pgmap->res.end = pgmap->res.start + size - 1;
>  	pgmap->res.flags = pci_resource_flags(pdev, bar);
>  	pgmap->type = MEMORY_DEVICE_PCI_P2PDMA;
> +	pgmap->pci_p2pdma_provider = pdev;
>  	pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) -
>  		pci_resource_start(pdev, bar);

I think we need to bite the bullet and move the PCIe P2P specific
information out of struct dev_pagemap and into a pci-specific structure
that embedds struct dev_pagemap.