linux-kernel - Re: [PATCH v17 06/12] Documentation: PCI: Remove reset

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Date:   Tue, 17 Mar 2020 10:06:54 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     bjorn@...gaas.com
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        "Raj, Ashok" <ashok.raj@...el.com>
Subject: Re: [PATCH v17 06/12] Documentation: PCI: Remove reset_link
 references

On Tue, Mar 17, 2020 at 11:03:36AM -0500, Bjorn Helgaas wrote:
> On Tue, Mar 17, 2020 at 10:09 AM Christoph Hellwig <hch@...radead.org> wrote:
> >
> > On Tue, Mar 17, 2020 at 08:05:50AM -0700, Kuppuswamy, Sathyanarayanan wrote:
> > > > > From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> > > > >
> > > >
> > > > This should be folded into the patch removing the method.
> > > This is also folded in the mentioned patch.
> > > https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=review/edr&id=7a18dc6506f108db3dc40f5cd779bc15270c4183
> >
> > I can't find that series anywhere on the list.  What did I miss?
> 
> We've still been discussing other issues (access to AER registers,
> synchronization between EDR and hotplug, etc) in other parts of this
> thread.  The git branch Sathy pointed to above is my local branch.
> I'll send it to the list before putting it into -next, but I wanted to
> make progress on some of these other issues first.

A few nitpicks:

PCI/ERR: Update error status after reset_link():

 - there are two "if (state == pci_channel_io_frozen)"
   right after each other now, merging them would make the code a little
   easier to read.

PCI/DPC: Move DPC data into struct pci_dev:

 - dpc_rp_extensions probable should be a "bool : 1"

PCI/ERR: Remove service dependency in pcie_do_recovery():

 - as mentioned to Kuppuswamy the reset_cb is never NULL, and thus
   a lot of dead code in reset_link can be removed.  Also reset_link
   should be merged into pcie_do_recovery.  That would also enable
   to call the argument reset_link, which might be a bit more
   descriptive than reset_cb.

PCI/DPC: Cache DPC capabilities in pci_init_capabilities():

 - I think the pci_dpc_init could be cleaned up a bit to:

	...
	pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_CAP, &cap);
	if (!(cap & PCI_EXP_DPC_CAP_RP_EXT))
		return;
	pdev->dpc_rp_extensions = true;
	pdev->dpc_rp_log_size = (cap & PCI_EXP_DPC_RP_PIO_LOG_SIZE) >> 8;
	...