From: Bjorn Helgaas <helgaas@kernel.org>
To: linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-pm@vger.kernel.org, Keith Busch <keith.busch@intel.com>,
Sinan Kaya <okaya@codeaurora.org>, Lukas Wunner <lukas@wunner.de>,
Frederick Lawler <fred@fredlawl.com>
Subject: [PATCH v2 10/13] PCI/portdrv: Remove "pcie_hp=nomsi" kernel parameter
Date: Fri, 09 Mar 2018 13:00:43 -0600 [thread overview]
Message-ID: <152062204375.77693.9816633817360497350.stgit@bhelgaas-glaptop.roam.corp.google.com> (raw)
In-Reply-To: <152062141493.77693.9630397416694091342.stgit@bhelgaas-glaptop.roam.corp.google.com>
From: Bjorn Helgaas <bhelgaas@google.com>
7570a333d8b0 ("PCI: Add pcie_hp=nomsi to disable MSI/MSI-X for pciehp
driver") added the "pcie_hp=nomsi" kernel parameter to work around this
error on shutdown:
irq 16: nobody cared (try booting with the "irqpoll" option)
Pid: 1081, comm: reboot Not tainted 3.2.0 #1
...
Disabling IRQ #16
This happened on an unspecified system (possibly involving the Integrated
Device Technology, Inc. Device 807f bridge) where "an un-wanted interrupt
is generated when PCI driver switches from MSI/MSI-X to INTx while shutting
down the device."
The implication was that the device was buggy, but it is normal for a
device to use INTx after MSI/MSI-X have been disabled. The only problem
was that the driver was still attached and it wasn't prepared for INTx
interrupts. Prarit Bhargava fixed this issue with fda78d7a0ead ("PCI/MSI:
Stop disabling MSI/MSI-X in pci_device_shutdown()").
There is no automated way to set this parameter, so it's not very useful
for distributions or end users. It's really only useful for debugging, and
we have "pci=nomsi" for that purpose.
Revert 7570a333d8b0 to remove the "pcie_hp=nomsi" parameter.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: MUNEDA Takahiro <muneda.takahiro@jp.fujitsu.com>
CC: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
CC: Prarit Bhargava <prarit@redhat.com>
---
Documentation/admin-guide/kernel-parameters.txt | 4 ----
drivers/pci/pcie/portdrv.h | 12 ------------
drivers/pci/pcie/portdrv_core.c | 20 +++-----------------
3 files changed, 3 insertions(+), 33 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 1d1d53f85ddd..761749562165 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3130,10 +3130,6 @@
force Enable ASPM even on devices that claim not to support it.
WARNING: Forcing ASPM on may cause system lockups.
- pcie_hp= [PCIE] PCI Express Hotplug driver options:
- nomsi Do not use MSI for PCI Express Native Hotplug (this
- makes all PCIe ports use INTx for hotplug services).
-
pcie_ports= [PCIE] PCIe ports handling:
auto Ask the BIOS whether or not to use native PCIe services
associated with PCIe ports (PME, hot-plug, AER). Use
diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h
index ed84e767085f..86368f9341d7 100644
--- a/drivers/pci/pcie/portdrv.h
+++ b/drivers/pci/pcie/portdrv.h
@@ -91,18 +91,6 @@ void pcie_port_bus_unregister(void);
struct pci_dev;
-#ifdef CONFIG_HOTPLUG_PCI_PCIE
-extern bool pciehp_msi_disabled;
-
-static inline bool pciehp_no_msi(void)
-{
- return pciehp_msi_disabled;
-}
-
-#else /* !CONFIG_HOTPLUG_PCI_PCIE */
-static inline bool pciehp_no_msi(void) { return false; }
-#endif /* !CONFIG_HOTPLUG_PCI_PCIE */
-
#ifdef CONFIG_PCIE_PME
extern bool pcie_pme_msi_disabled;
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 589960fdd8a8..ed24a407518a 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -20,17 +20,6 @@
#include "../pci.h"
#include "portdrv.h"
-bool pciehp_msi_disabled;
-
-static int __init pciehp_setup(char *str)
-{
- if (!strncmp(str, "nomsi", 5))
- pciehp_msi_disabled = true;
-
- return 1;
-}
-__setup("pcie_hp=", pciehp_setup);
-
/**
* release_pcie_device - free PCI Express port service device structure
* @dev: Port service device to release
@@ -168,16 +157,13 @@ static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
irqs[i] = -1;
/*
- * If we support PME or hotplug, but we can't use MSI/MSI-X for
- * them, we have to fall back to INTx or other interrupts, e.g., a
- * system shared interrupt.
+ * If we support PME but can't use MSI/MSI-X for it, we have to
+ * fall back to INTx or other interrupts, e.g., a system shared
+ * interrupt.
*/
if ((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi())
goto legacy_irq;
- if ((mask & PCIE_PORT_SERVICE_HP) && pciehp_no_msi())
- goto legacy_irq;
-
/* Try to use MSI-X or MSI if supported */
if (pcie_port_enable_irq_vec(dev, irqs, mask) == 0)
return 0;
next prev parent reply other threads:[~2018-03-09 19:00 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-09 18:59 [PATCH v2 00/13] PCI: Simplify PCIe port driver Bjorn Helgaas
2018-03-09 18:59 ` [PATCH v2 01/13] PCI/portdrv: Merge pcieport_if.h into portdrv.h Bjorn Helgaas
2018-03-12 7:59 ` Christoph Hellwig
2018-03-09 19:00 ` [PATCH v2 02/13] PCI/PM: Move pcie_clear_root_pme_status() to core Bjorn Helgaas
2018-03-12 8:00 ` Christoph Hellwig
2018-03-09 19:00 ` [PATCH v2 03/13] PCI/PM: Clear PCIe PME Status bit in core, not PCIe port driver Bjorn Helgaas
2018-03-09 19:00 ` [PATCH v2 04/13] PCI/PM: Clear PCIe PME Status bit for Root Complex Event Collectors Bjorn Helgaas
2018-03-09 19:00 ` [PATCH v2 05/13] PCI/portdrv: Disable port driver in compat mode Bjorn Helgaas
2018-03-09 19:00 ` [PATCH v2 06/13] PCI/portdrv: Remove pcie_port_bus_type link order dependency Bjorn Helgaas
2018-03-12 8:01 ` Christoph Hellwig
2018-03-12 14:17 ` Bjorn Helgaas
2018-03-09 19:00 ` [PATCH v2 07/13] PCI/portdrv: Remove unused PCIE_PORT_SERVICE_VC Bjorn Helgaas
2018-03-12 8:02 ` Christoph Hellwig
2018-03-09 19:00 ` [PATCH v2 08/13] PCI/portdrv: Simplify PCIe feature permission checking Bjorn Helgaas
2018-03-12 8:04 ` Christoph Hellwig
2018-03-12 14:03 ` Bjorn Helgaas
2018-03-12 14:20 ` Lukas Wunner
2018-03-19 18:37 ` Bjorn Helgaas
2019-05-07 12:00 ` David Woodhouse
2019-05-07 12:49 ` Bjorn Helgaas
2019-05-07 13:02 ` David Woodhouse
2019-05-07 14:07 ` Bjorn Helgaas
2019-05-08 6:45 ` David Woodhouse
2018-03-09 19:00 ` [PATCH v2 09/13] PCI/portdrv: Remove unnecessary include of <linux/pci-aspm.h> Bjorn Helgaas
2018-03-09 19:00 ` Bjorn Helgaas [this message]
2018-03-09 19:00 ` [PATCH v2 11/13] PCI/portdrv: Remove unnecessary "pcie_ports=auto" parameter Bjorn Helgaas
2018-03-09 19:00 ` [PATCH v2 12/13] PCI/portdrv: Encapsulate pcie_ports_auto inside the port driver Bjorn Helgaas
2018-03-09 19:01 ` [PATCH v2 13/13] PCI/portdrv: Rename and reverse sense of pcie_ports_auto Bjorn Helgaas
2018-03-19 18:43 ` [PATCH v2 00/13] PCI: Simplify PCIe port driver Bjorn Helgaas
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