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authorBjorn Helgaas <bhelgaas@google.com>2018-03-09 11:21:27 -0600
committerBjorn Helgaas <helgaas@kernel.org>2018-03-30 17:26:56 -0500
commit1e447c57ae367c030e7b424f55a91470ae7604ca (patch)
tree62c63bd47fff39ae4fabce7a994ac86404f49317 /drivers/pci
parent1b64cb87cf0013cdd04b7e1665072a00f92b830f (diff)
downloadlinux-1e447c57ae367c030e7b424f55a91470ae7604ca.tar.bz2
PCI/portdrv: Remove "pcie_hp=nomsi" kernel parameter
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>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pcie/portdrv.h12
-rw-r--r--drivers/pci/pcie/portdrv_core.c20
2 files changed, 3 insertions, 29 deletions
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 5c25761cd05e..6ed67cbf6148 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;