linux-kernel - Re: [PATCH V13.1] PCI/DOE: Add DOE mailbox support functions

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Date:   Mon, 11 Jul 2022 23:47:31 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     ira.weiny@...el.com
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        "Li, Ming" <ming4.li@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Lukas Wunner <lukas@...ner.de>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ben Widawsky <bwidawsk@...nel.org>,
        linux-kernel@...r.kernel.org, linux-cxl@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH V13.1] PCI/DOE: Add DOE mailbox support functions

On Mon, Jul 11, 2022 at 03:27:48PM -0700, ira.weiny@...el.com wrote:
> +/**
> + * struct pci_doe_mb - State for a single DOE mailbox
> + *
> + * This state is used to manage a single DOE mailbox capability.  All fields
> + * should be considered opaque to the consumers and the structure passed into
> + * the helpers below after being created by devm_pci_doe_create()
> + *
> + * @pdev: PCI device this mailbox belongs to
> + * @cap_offset: Capability offset
> + * @prots: Array of protocols supported (encoded as long values)
> + * @wq: Wait queue for work item
> + * @work_queue: Queue of pci_doe_work items
> + * @flags: Bit array of PCI_DOE_FLAG_* flags
> + *
> + * Note: @prots can't be allocated with struct size because the number of
> + * protocols is not known until after this structure is in use.  However, the
> + * single discovery protocol is always required to query for the number of
> + * protocols.
> + */

Can you add at least stub documentation in Documentation/PCI/doe.rst
and include the kernel-doc from both pci-doe.c and pci-doe.h?

> +static int pci_doe_abort(struct pci_doe_mb *doe_mb)
> +{
> +	struct pci_dev *pdev = doe_mb->pdev;
> +	int offset = doe_mb->cap_offset;
> +	unsigned long timeout_jiffies;
> +
> +	pci_dbg(pdev, "[%x] Issuing Abort\n", offset);

"Issuing DOE abort", perhaps?