linux-kernel - Re: [PATCH V13 3/9] PCI: Create PCIe library functions in support of DOE mailboxes.

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Message-ID: <Ysx2VdJJQFWp1oC9@iweiny-desk3>
Date:   Mon, 11 Jul 2022 12:13:25 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
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>, 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 3/9] PCI: Create PCIe library functions in support of
 DOE mailboxes.

On Thu, Jul 07, 2022 at 11:22:23AM -0500, Bjorn Helgaas wrote:
> On Tue, Jul 05, 2022 at 08:49:26AM -0700, ira.weiny@...el.com wrote:
> > From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> Possible subject:
> 
>   PCI/DOE: Add DOE mailbox support functions
> 
> (no trailing period required)
> 
> > Introduced in a PCIe r6.0, sec 6.30, DOE provides a config space based
> > mailbox with standard protocol discovery.  Each mailbox is accessed
> > through a DOE Extended Capability.
> > 
> > Each DOE mailbox must support the DOE discovery protocol in addition to
> > any number of additional protocols.
> > 
> > Define core PCIe functionality to manage a single PCIe DOE mailbox at a
> > defined config space offset.  Functionality includes iterating,
> > creating, query of supported protocol, and task submission.  Destruction
> > of the mailboxes is device managed.
> > 
> > Cc: "Li, Ming" <ming4.li@...el.com>
> > Cc: Bjorn Helgaas <helgaas@...nel.org>
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Co-developed-by: Ira Weiny <ira.weiny@...el.com>
> > Signed-off-by: Ira Weiny <ira.weiny@...el.com>
> 
> Whenever the CXL folks are happy with this:
> 
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> > +static int pci_doe_recv_resp(struct pci_doe_mb *doe_mb, struct pci_doe_task *task)
> > ...
> > +		pci_err(pdev,
> > +			"[%x] expected [VID, Protocol] = [%04x, %02x], got [%04x, %02x]\n",
> 
> Since the string already wraps, I think there's no benefit to starting
> it on its own line.  Joining with "pci_err(pdev, "[%x] ..." improves
> greppability slightly.
> 
> > +			pci_err(pdev,
> > +				"[%x] busy detected; another entity is sending conflicting requests\n",
> > +				offset);
> 
> Ditto.
> 
> > + * pci_doe_submit_task() - Submit a task to be processed by the state machine
> > ...
> > + * RETURNS: 0 when task has been successful queued, -ERRNO on error
> 
> successfully
> 
> > +int pci_doe_submit_task(struct pci_doe_mb *doe_mb, struct pci_doe_task *task)
> > ...
> > +	 * DOE requests must be a whole number of DW
> > +	 * and the response needs to be big enough for at least 1 DW
> 
> Rewrap to fill 78 columns or so.

Thanks, I've fixed these up and will submit a 13.1 soon with Willy's change to
xa_mk_value() which he caught from the other thread.

Thanks again for all the review,
Ira