linux-kernel - [PATCH 0/2] PCI: decode disable fixes

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Message-ID: <20120709181745.18165.93914.stgit@bhelgaas.mtv.corp.google.com>
Date:	Mon, 09 Jul 2012 12:20:12 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	linux-pci@...r.kernel.org
Cc:	Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Robert Hancock <hancockrwd@...il.com>
Subject: [PATCH 0/2] PCI: decode disable fixes

Since 2.6.36 (253d2e5498), we've disabled MEM & IO decoding while we size
BARs (except for host bridge devices).  These patches tweak this in two
ways:

1) We only kept decoding disabled while sizing the low-order dword
of 64-bit BARs.  I think we should keep it disabled while we do the
high-order dword also.

2) I think we should also disable decoding while updating 64-bit BARs,
e.g., when we move a device into an aperture of an upstream bridge.  I'm
only proposing to disable decoding for 64-bit BAR updates because 32-bit
ones can be done atomically, while 64-bit updates require two writes and
the half-written state is a potential problem.

I'm considering these changes for the 3.6 merge window, which is
approaching fast, so let me know if you see issues with either of these.

---

Bjorn Helgaas (2):
      PCI: leave MEM and IO decoding disabled during 64-bit BAR sizing, too
      PCI: disable MEM decoding while updating 64-bit MEM BARs

 drivers/pci/probe.c     |    6 +++---
 drivers/pci/setup-res.c |   18 ++++++++++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

-- 
Bjorn
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