linux-pci.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Bjorn Helgaas <helgaas@kernel.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>,
	bhelgaas@google.com,
	"open list:PCI SUBSYSTEM" <linux-pci@vger.kernel.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2] PCI: Coalesce contiguous regions for host bridges
Date: Fri, 9 Jul 2021 18:43:14 -0500	[thread overview]
Message-ID: <20210709234314.GA1181719@bjorn-Precision-5520> (raw)
In-Reply-To: <20210709231529.GA3270116@roeck-us.net>

On Fri, Jul 09, 2021 at 04:15:29PM -0700, Guenter Roeck wrote:
> Hi,
> 
> On Thu, Apr 01, 2021 at 09:12:52PM +0800, Kai-Heng Feng wrote:
> > Built-in graphics on HP EliteDesk 805 G6 doesn't work because graphics
> > can't get the BAR it needs:
> > [    0.611504] pci_bus 0000:00: root bus resource [mem 0x10020200000-0x100303fffff window]
> > [    0.611505] pci_bus 0000:00: root bus resource [mem 0x10030400000-0x100401fffff window]
> > ...
> > [    0.638083] pci 0000:00:08.1:   bridge window [mem 0xd2000000-0xd23fffff]
> > [    0.638086] pci 0000:00:08.1:   bridge window [mem 0x10030000000-0x100401fffff 64bit pref]
> > [    0.962086] pci 0000:00:08.1: can't claim BAR 15 [mem 0x10030000000-0x100401fffff 64bit pref]: no compatible bridge window
> > [    0.962086] pci 0000:00:08.1: [mem 0x10030000000-0x100401fffff 64bit pref] clipped to [mem 0x10030000000-0x100303fffff 64bit pref]
> > [    0.962086] pci 0000:00:08.1:   bridge window [mem 0x10030000000-0x100303fffff 64bit pref]
> > [    0.962086] pci 0000:07:00.0: can't claim BAR 0 [mem 0x10030000000-0x1003fffffff 64bit pref]: no compatible bridge window
> > [    0.962086] pci 0000:07:00.0: can't claim BAR 2 [mem 0x10040000000-0x100401fffff 64bit pref]: no compatible bridge window
> > 
> > However, the root bus has two contiguous regions that can contain the
> > child resource requested.
> > 
> > Bjorn Helgaas pointed out that we can simply coalesce contiguous regions
> > for host bridges, since host bridge don't have _SRS. So do that
> > accordingly to make child resource can be contained. This change makes
> > the graphics works on the system in question.
> > 
> > Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=212013
> > Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
> > Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> 
> With this patch in place, I can no longer boot the ppc:sam460ex
> qemu emulation from nvme. I see the following boot error:
> 
> nvme nvme0: Device not ready; aborting initialisation, CSTS=0x0
> nvme nvme0: Removing after probe failure status: -19

Thanks for the report and bisection!

I'll try to get this reverted before v5.14-rc1.

Bjorn

  reply	other threads:[~2021-07-09 23:43 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01 13:12 [PATCH v2] PCI: Coalesce contiguous regions for host bridges Kai-Heng Feng
2021-04-22  8:57 ` Kai-Heng Feng
2021-05-11  3:33   ` Kai-Heng Feng
2021-05-27 22:13 ` Bjorn Helgaas
2021-07-09 23:15 ` Guenter Roeck
2021-07-09 23:43   ` Bjorn Helgaas [this message]
2021-07-12  3:50   ` Kai-Heng Feng
2021-07-12  4:50     ` Guenter Roeck
2021-07-12  4:52       ` Kai-Heng Feng

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210709234314.GA1181719@bjorn-Precision-5520 \
    --to=helgaas@kernel.org \
    --cc=bhelgaas@google.com \
    --cc=kai.heng.feng@canonical.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linux@roeck-us.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).