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Add a loader tunable (hw.pci.enable_pcie_hp) to disable PCI-e HotPlug.

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Some systems and/or devices (such as riser cards) do not include a
non-compliant implementation of PCI-e HotPlug that can result in devices
not being attached (e.g. the HotPlug code might assume that a card is
being unplugged and will power the slot off and detach it).  This
tunable can be set to 0 to disable support for PCI-e HotPlug ignoring
the incorrect HotPlug state on these slots.

PR:		211081
Reported by:	Sergey Renkas <serg_ic@mail.ru> (SuperMicro X7 riser card)
Reported by:	Jeffrey E Pieper <jeffrey.e.pieper@intel.com>
	 	(Intel X520 adapter)
MFC after:	1 week
Relnotes:	yes
This commit is contained in:
John Baldwin 2016-07-29 17:54:21 +00:00
parent 718fe473dd
commit 25a57bd64b
1 changed files with 8 additions and 0 deletions
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8
sys/dev/pci/pci_pci.c
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@ -907,11 +907,19 @@ pcib_set_mem_decode(struct pcib_softc *sc)
/*
* PCI-express HotPlug support.
*/
static int pci_enable_pcie_hp = 1;
SYSCTL_INT(_hw_pci, OID_AUTO, enable_pcie_hp, CTLFLAG_RDTUN,
&pci_enable_pcie_hp, 0,
"Enable support for native PCI-express HotPlug.");
static void
pcib_probe_hotplug(struct pcib_softc *sc)
{
device_t dev;
if (!pci_enable_pcie_hp)
return;
dev = sc->dev;
if (pci_find_cap(dev, PCIY_EXPRESS, NULL) != 0)
return;