From: Bjorn Helgaas <helgaas@kernel.org>
To: linux-pci@vger.kernel.org
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Keith Busch <keith.busch@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rjw@rjwysocki.net>,
Mika Westerberg <mika.westerberg@linux.intel.com>,
linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
Bjorn Helgaas <bhelgaas@google.com>
Subject: [PATCH 0/5] PCI: Add PCI_ERROR_RESPONSE, check for errors
Date: Mon, 5 Aug 2019 15:52:09 -0500 [thread overview]
Message-ID: <20190805205214.194981-1-helgaas@kernel.org> (raw)
From: Bjorn Helgaas <bhelgaas@google.com>
Reads from a PCI device may fail if the device has been turned off (put
into D3cold), removed, or if some other error occurs. The PCI host bridge
typically fabricates ~0 data to complete the CPU's read.
We check for that in a few places, but not in a consistent way. This
series adds a PCI_ERROR_RESPONSE definition to make the checks more
consistent and easier to find. Note that ~0 may indicate a PCI error, but
it may also be valid read data, so you need more information (such as
knowing that a register can never contain ~0) before concluding that it's
an error.
This series also adds some new checks for PCI_ERROR_RESPONSE in the power
management code because that code frequently encounters devices in D3cold,
where we previously misinterpreted ~0 data.
Bjorn Helgaas (5):
PCI: Add PCI_ERROR_RESPONSE definition
PCI / PM: Return error when changing power state from D3cold
PCI / PM: Check for error when reading PME status
PCI / PM: Check for error when reading Power State
PCI / PM: Decode D3cold power state correctly
drivers/pci/access.c | 13 +++----
.../pci/controller/dwc/pcie-designware-host.c | 2 +-
drivers/pci/controller/pci-aardvark.c | 2 +-
drivers/pci/controller/pci-mvebu.c | 4 +-
drivers/pci/controller/pci-thunder-ecam.c | 20 +++++-----
drivers/pci/controller/pci-thunder-pem.c | 2 +-
drivers/pci/controller/pcie-altera.c | 2 +-
drivers/pci/controller/pcie-iproc.c | 2 +-
drivers/pci/controller/pcie-mediatek.c | 4 +-
drivers/pci/controller/pcie-rcar.c | 2 +-
drivers/pci/controller/pcie-rockchip-host.c | 2 +-
drivers/pci/controller/vmd.c | 2 +-
drivers/pci/hotplug/cpqphp_ctrl.c | 12 +++---
drivers/pci/hotplug/cpqphp_pci.c | 20 +++++-----
drivers/pci/hotplug/pciehp_hpc.c | 6 +--
drivers/pci/pci.c | 38 ++++++++++++-------
drivers/pci/pcie/dpc.c | 3 +-
drivers/pci/pcie/pme.c | 4 +-
drivers/pci/probe.c | 4 +-
drivers/pci/quirks.c | 2 +-
include/linux/pci.h | 20 ++++++++++
21 files changed, 98 insertions(+), 68 deletions(-)
--
2.22.0.770.g0f2c4a37fd-goog
next reply other threads:[~2019-08-05 20:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 20:52 Bjorn Helgaas [this message]
2019-08-05 20:52 ` [PATCH 1/5] PCI: Add PCI_ERROR_RESPONSE definition Bjorn Helgaas
2019-08-05 21:16 ` Rafael J. Wysocki
2019-08-05 20:52 ` [PATCH 2/5] PCI / PM: Return error when changing power state from D3cold Bjorn Helgaas
2019-08-05 21:15 ` Rafael J. Wysocki
2019-08-05 20:52 ` [PATCH 3/5] PCI / PM: Check for error when reading PME status Bjorn Helgaas
2019-08-05 21:02 ` Rafael J. Wysocki
2019-08-06 13:36 ` Bjorn Helgaas
2019-08-13 23:26 ` Rafael J. Wysocki
2019-08-14 1:15 ` Bjorn Helgaas
2019-08-05 20:52 ` [PATCH 4/5] PCI / PM: Check for error when reading Power State Bjorn Helgaas
2019-08-05 21:09 ` Rafael J. Wysocki
2019-08-09 22:01 ` Bjorn Helgaas
2019-08-13 22:59 ` Rafael J. Wysocki
2019-08-14 1:08 ` Bjorn Helgaas
2019-08-05 20:52 ` [PATCH 5/5] PCI / PM: Decode D3cold power state correctly Bjorn Helgaas
2019-08-05 21:14 ` Rafael J. Wysocki
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